Today, I have a great guest post to share from Maria Hanif. It is about “Countersink Hole Size for Machine Screw.” Please read and enjoy!

Properly sized countersink holes, along with the appropriate countersink angle, are crucial for achieving secure and effective fastening in engineering applications. Countersinking involves creating a conical recess on the workpiece surface to accommodate the machine screw head. By ensuring the appropriate countersink angle, the screw head sits flush or slightly below the surface, and the countersink hole enhances both the structural integrity and visual appeal of the assembly.

The correct countersink angle is essential for preventing protrusion, evenly distributing the load, and achieving a secure fit. Machine screws, widely used in metalworking, woodworking, electronics, and machinery assembly, provide reliable fastening solutions in various engineering applications.

Countersink Hole Size and Depth for Machine Screws

Screw Head Diameter and Shape

1. Determining the Major and Minor Diameters: To calculate the appropriate countersink hole size, it is essential to determine the major and minor diameters of the screw head. The major diameter represents the widest part of the head, while the minor diameter corresponds to the narrower section just below the head.

Measure these dimensions accurately using calipers or a micrometer. The major diameter is used to determine the countersink hole diameter, while the minor diameter helps in selecting the appropriate pilot hole size.

2. Considerations for Conical, Flat, or Oval Screw Heads: Different screw head shapes, such as conical, flat, or oval, require specific considerations when determining the countersink hole size. For conical screw heads, the countersink angle plays a crucial role. The standard countersink angle is typically 82 degrees for conical heads.

Flat or oval screw heads may require a different countersink angle, depending on the manufacturer’s specifications or engineering standards. Refer to manufacturer guidelines or standards for specific countersink angles for different screw head shapes.

Related Article: What is the QA/QC Engineer and What He is Doing on Site?

Depth of the Countersink Hole

1. Optimal Depth for Achieving Proper Flushness: The depth of the countersink hole determines how flush the screw head sits with the surface of the workpiece. The optimal depth ensures a secure fit and a visually pleasing result. A common guideline is to make the countersink hole depth equal to the height of the screw head. This ensures that the screw head sits flush or slightly below the surface, providing stability and preventing interference.

Adjusting Depth for Different Screw Lengths: The depth of the countersink hole may need to be adjusted for screws of different lengths. Longer screws may require a deeper countersunk screw angle to accommodate the additional length while maintaining proper flushness. Consider the length of the screw and the desired countersink depth when determining the appropriate depth for the countersink hole. Adjustments can be made to ensure that the screw head is securely seated without protruding above the surface.

Countersunk Hole Size Chart for Machine Fasteners

Verifying Countersink Hole Size for Optimal Fit

Appropriate Countersunk screw angle

Before applying countersink holes to the actual workpiece, it is recommended to verify the size using test samples. This allows for adjustments and fine-tuning to ensure the desired fit and flushness. To verify the countersink hole size, measure the major and minor diameters of the screw head accurately. Then, using the appropriate countersink angle (typically 82 degrees), calculate the required countersink hole diameter.

Table 1 provides a general guideline for countersink hole sizes based on screw head diameter and the corresponding standard countersink angle.

Pilot Holes and Clearance Holes

For successful installation of machine screws, especially in harder materials or when dealing with higher torque applications, pilot holes and clearance holes are often necessary. A pilot hole is a small-diameter hole drilled into the workpiece to guide the machine screw, while a clearance hole is larger in diameter to allow the screw to pass through without threading into the material. The size of the pilot hole should be slightly smaller than the screw’s minor diameter, while the clearance hole should match the screw’s major diameter.

Table 2 provides recommended pilot hole and clearance hole sizes for common machine screw sizes and standard counter sink angle.

Selection of Countersinking Tools and Techniques:

Choosing the appropriate countersinking tools and techniques is crucial for achieving accurate and consistent results. Manual countersink tools, such as single-flute or multi-flute countersinks, provide versatility and control for smaller projects.

For larger-scale or repetitive applications, machine-driven countersink tools, such as drill press countersinks or automated countersinking machines, offer precision and efficiency. Consider the size and type of machine screws, the material being countersunk, counter sink angle and the available equipment when selecting the most suitable countersinking tools and techniques.

Related Article: 5 Method to Avoid Concrete Cracking

Material-Specific Considerations

When countersinking machine screws, it is important to consider the specific characteristics of the material being worked on. Different materials may require adjustments in the countersink angle, depth, or speed to achieve optimal results. For example, softer materials like wood may require a shallower countersink angle to prevent splitting, while harder materials like metal may benefit from a steeper countersink angle for a more secure fit. Additionally, material hardness and brittleness can affect the speed and feed rates during the countersinking process.

Conclusion

Summing things up, achieving the proper countersink hole size is essential for successful machine screw installation. By verifying the hole size using test samples, utilizing pilot holes and clearance holes when necessary, selecting appropriate counter sink angle, and considering material-specific characteristics, engineers and craftsmen can ensure reliable and aesthetically pleasing assemblies.

FAQs – Countersink Hole Sizing and Machine Screws

Did you like the above article? If so, please write down your comment below.

Author bio: Maria Hanif is a content writer and SEO Expert.

The erection of precast hollow core slabs is sometimes used in a large project such as a mix-used building project, malls, airports etc.

So, without further ado, here is the “Method Statement for Erection of Precast Hollow Core Slabs.”

1. Delivery Of Hollow Core Slabs

1.1 Hollow core Slabs are delivered to the site on flatbed trailers. The trailers are equipped to carry a maximum load weight of 30 tons.

1.2 Once trailers reach the site, it will pass through the logistic checking area to verify the compatibility of the trailer and load as per project logistics and safety plans.

1.3 Directions will be given to drivers to reach the location of unloading, trailer is brought close to the building, under the crane area where erection of precast hollow core slabs is to be carried out.

1.4 The lifting area will be barricaded, appropriate signage will be in place, and an Exclusion zone will be established to avoid unauthorized entries.

2. Setting out & Erection of Precast Hollow Core Slabs

2.1 Setting out and marking are carried out with the help of site grid reference points (given by the Main Contractor).

2.2 Cast in situ beams (By Main Contractor) to be kept ready to receive the hollow core slabs, the levels on the in-situ beam are perfected with shims.

2.3 The soffit levels of the hollow core slabs will be as per the final top levels of those structures.

2.4 Slabs will be delivered with open cores. Cores are to be closed with polystyrene core plugs either before lifting the hollow core slab from load or after erection but before grouting/screeding to avoid the flow of concrete in the core while screeding.

2.5 Suitable required to start erection of precast hollow core slabs works scaffolding will be provided with suitable safe access ladders, guard rail, handrail posts, and scaffold boards, scaffolding and platforms will be erected according to approved Methos Statement for Scaffolding ref. MRO-XXX-CIV-MST-00065.

2.6 Lifeline will be installed and clipped to the reinforcement bars from the columns before starting any erection works, life line will be installed as per approved MS ref. MRO-XXX-CIV-MST-00074.

2.7 All lifting works will be done as per the approved lifting plan for the method statement for erection of precast hollow core slabs.

2.8 Slabs are lifted directly from the trailer and placed in position by a mobile crane or tower crane. If the site is not ready then the slabs will be offloaded at the site on timbers safely in the designated storage area.

2.13 Full slabs are lifted using specially designed lifting equipment. Either a lifting clamp or lifting belts, depending on the site requirement/ access/ HCS Slabs size. The weight of the lifting equipment is as follows:

Slab Weight Weight of lifting equipment
0 to 6 tons 1ton
6 to 8tons 2.6ton
8 to 12tons 4.6ton
12 to 16tons 6.3ton
Note: All the lifting equipment will have third-party lifting certificates.

2.14 All the HCS of 150 mm to 320 mm thick will be erected using a lifting clamp or lifting belt. All the HCS of 400mm, 500 mm thick, and part slabs less than 1200 mm in width of all thickness will be lifted using a lifting belt.

2.15 After the completion of the erection, slab alignment will be checked and adjusted, the levels are checked from below and corrections are carried out wherever necessary.

2.16 The Hollow Core slabs are now ready to receive the reinforcement, MEP (if required), and the screed topping by the Main Contractor.
Topping concrete will be carried out as per MS ref. MRO-XXX-CIV-MST-00074.

Related Article: Method Statement for Shoring Wall Block Work

3. Materials to be used for the Method Statement for the Erection of Precast Hollow Core Slabs:

Hollow core slabs

4. Safety: Proposed Control Measures to Reduce the Risks (use additional sheet if necessary)

• PTB briefing will be conducted daily before any works commence as per DSTI which shall be performed daily.

• MS/RA will be briefed to all concerned persons.

• Barricading will be in place around the working area.

• Appropriate signage will be in place.

• Any rebar will be covered with appropriate rebar caps.

• Mandatory and appropriate job-specific PPE shall be used and worn at all times.

• Hard hats or helmets will be secured with the use of a chin strap.

• Exclusion zone will be established to avoid unauthorized entries.

• Lifting Process will be controlled as per the approved Lifting Plan.

Related Article: Method Statement for Water Leakage Test for Installed Curtain Walls

• The lifeline should be a 12mm steel wire rope which must be looped from column to column and carefully tighten with at least three clamps in the same direction at each loop

• All exposed openings/risers and shafts will be covered and barricaded with robust material, Scaffolding pipes along with Toe Board etc… to avoid falling Materials and people from heights and relevant signage will be placed near the area PTW for Opening, Removal/shafts of edge protection will be issued as per requirements

• All cranes and lifting gear are to be inspected and certified by 3rd party, no lift/s will be carried out without a 3rd party certified rigger.

• Hard Hat has to be used with chin strap while working on height

• In case of Near Miss, Accidents incidents any kind of Emergencies number displayed on site notice board – 055 000000 – Mr Name of Safety Officer ( Emergency Coordinator)

• Rigger and crane operator maintain communication (visual or radio);

• Mobile phones not to be used while at work;

• No lift/s will be carried out without a 3rd party certified rigger.

• All work must be supervised by the crew in charge.

• All plant and machinery will be inspected and certified.

• All lifting accessories tools and tackles, scaffold inspectors, and scaffolders will be competent 3rd party certified.

• All operators & banks man will be trained and 3rd party certified.

• Defined access & egress routes.

• Weather preparedness checklist will be conducted and the forecast will be monitored.

Did you use the above Method Statement for Erection of Precast Hollow Core Slabs?

Image courtesy of Phnom Penh Precast Construction Co., Ltd

Today, I have a great guest post to share from Emily John. It is about “hiring a construction company.” Please read and enjoy!

Construction projects are never easy. Even if you have the right plans, a lot of things need to go right for it to be implemented successfully. There are so many things to think about and plan before you can even start your construction project. There are so many construction companies in the market offering their services. With so many options, it may get challenging for you to choose the best one that meets your needs and budget as well.

No matter how small or big your construction project is, you need to hire the best construction company that fits your criteria and budget as well. In order to help you with this, here are some tips on what you should look out for before hiring a construction company:

Research and know your requirements

Before you start looking for construction companies, you must know what it is that you need from one. The first thing you should do is to know your requirements. This will help you narrow down your search for the best construction company.

Some of the things you need to keep in mind while researching for a construction company include: – Budget – You must know what your budget is. This will help you determine the kind of construction company you can hire. – Time frame – You must also know the time frame in which you need your construction project to be completed. This will help you determine the kind of construction company you can hire. – Scope of work – You must also know what your scope of work is. This will help you determine the kind of construction company you can hire.

Reputation is everything

If you are looking for a construction company to hire, start by selecting a company that has a good reputation. There are a lot of companies in the market but you should go for the best construction company so that you should be able to trust them with your home and your investment. To make a good decision, you must do your research by reading reviews, articles, and testimonials from people who have worked with that construction company. This will give you an insight on what to expect from the company.

You can also find out about the company by talking to your local city council. They will be able to tell you about the different construction companies who have applied for permits in your area. You can also seek recommendations from your family and friends who have recently hired a construction company.

Check the licensing of the construction company you’re hiring

Make sure that you check the licensing of the construction company you are hiring. This will help you determine if the company is qualified to do your project. There are different types of licenses, and each company will have a different license depending on the type of services they offer. If you are not sure which construction company you should hire, you can start by checking their licenses. You can also call your local city council and find out if they have any complaints against construction companies in your area.

Don’t be afraid to ask questions

Before you sign the contract with a construction company, you should ask them questions about their services. Some of the things that you should be asking include: – What is included in the contract? Make sure you see everything that is in the contract to avoid any problems in the future. – What type of materials will be used?

Make sure you know the type of materials that will be used in your construction project to avoid any problems in the future. – What are your timelines? Make sure you know when you can expect your construction project to be completed.

Just because it’s expensive doesn’t mean it’s good

You should keep in mind that just because a construction company charges a lot doesn’t mean that they are good. You must do your research and find out how experienced they are, if they are licensed, and if they have a good reputation in the market. There are a lot of factors that go into determining the price of a construction company. Some of the factors include the size and scale of the project, the materials used, the location of the project, as well as the demand for their services in the market.

Related article:

1. Understanding AboutFormwork In Construction
2. Ten Steps To building A Reinforced Concrete Ground Floor Slab of A Hig-Rise Building
3. Top 10 Best Construction Companies In The Philippines

Final Words

When it comes to construction projects, you cannot afford to make any mistakes. That’s why it’s so important to hire the right contractor or construction company for the job. It’s not just about finding the cheapest contractor anymore. It’s about finding someone who is reliable, has good references, and offers a great service. The tips provided in this article will help you select the best construction company for your needs.

Author bio: Emily John is an amateur astronomer, a writer, and an artist. She loves reading and she believes that learning keeps you alive. She is writing blogs for several websites and she enjoys doing it.

Cracking on concrete is unavoidable. There are certain limits of crack width that a structure may have. But it is of serious concern if exceeds the limit. There are several types of cracks such as shrinkage crack, thermal expansion crack, hairline crack, crack due to outright loading, and many more. The root cause of cracking needs to be identified first before adopting any repair strategy.

But concrete cracks can also be avoided if you follow some important rules in the preparation for work on-site such as proper installation of reinforcement, the spacings of rebars must not have wide gaps and proper compaction of concrete. Actually, there are 5 methods to avoid concrete cracking.

Here we discuss the 7 Types of Concrete Crack Repairing.

1. Grouting

Grouting is the technique in which white cement or hydraulic cement is filled in the crack. First, the crack is chiseled to identify the actual depth of the crack. Groove made by chiseling is cleaned from small broken particles, dirt, and paint. The grouting material is filled in the groove. When it is set, the surface is sealed with sealing material so that it may not deteriorate or get stain.

2. Injection

In this method of repairing, after cleaning the crack line, small nails are fixed in the cracked line at a regular distance. An injection cord is hung on each nail and the concrete filler is injected. When it hardens, the injection cord is cut. Filler can be injected with pressure. This is how to repair concrete crack with epoxy, it must be followed seriously because failure may occur when done the other way. The injection type is one of the most popular concrete crack repairing ever known.

Related Article: Steel Coupler: Why Is It Important In Building Your Concrete Column

3. Stitching

Stitching is similar to stapling paper. Two holes are made on each side of the crack and a staple is inserted. Similarly, more staple/fasteners are inserted throughout the length of the crack. This technique is also known as sewing.

4. Reinforcement Addition

If the crack is wide or critical, which may lead to a brittle failure, it is necessary to reinforce it properly. For this, the concrete cover is removed and the surface is cleaned from dust. If reinforcement is rusted, it needs to be cleaned and painted with corrosion-resistant emulsion. Additional reinforcement is drilled where required. Lastly, the surface is re-concreted and plastered. This type of concrete crack repairing is rarely used in construction but it can be also done when agreed by site parties such as consultants and quality managers.

5. Steel Plate and Bolts

Bridges and industrial buildings have severe impact loadings. They are more prone to environmental and hazardous chemicals. Cracks in such structures may lead to strength failure due to creep. Ordinary repairing techniques are not effective for these structures. Steel Plates are bolted or riveted at the locations of crack to strengthen the cracked area.

6. Wire Mesh and Plaster

This technique is useful in areas where there are large numbers of hair cracks. Wire mesh is wrapped or fixed with nails on the cracked surface after cleaning. The surface is plastered again. This is also used in combination with bolts and plates.

7. Fiber Reinforced Polymer (FRP) Strengthening

Fiber Reinforced polymer is the composition of fibers that are reinforced with a polymer matrix. Fiber Reinforced is an excellent retrofitting material that can be used as strips, plates, rods, and spray. FRP is a high strength, durable, light density, and flexible material. FRP wrapping around cracked structure not only prevent cracking but it improves the overall structural strength.

FRP can be used at beam soffits, slabs, and around openings. It is applicable in the areas where other retrofitting techniques are not applicable due to the complexity of the structure. Fiber Reinforced Polymer improves building performance for both gravity and lateral loadings (wind and seismic).

Related Article: Cracks on Concrete Why It is Happening Part – 1

In order to avoid repairing concrete cracks, you must ensure that the ongoing construction of structural elements on site must be aligned in the approved plans and specifications which I already mentioned in the upper paragraph.

Did you follow the above 7 types of concrete crack repairing on your site? If you do, please share your experience with us and comment in the comment section below.

Method Statement for Installation of Earthing and Lightning Protection Systems Including Testing

Location of Work: Primary Substation Building Basement.

1 Method of Installation for Earthing and Lightning Protection Systems

1.1 Prior to installation, materials will be carefully delivered to the correct location. Suitable lifting equipment as applicable i.e. crane or forklift shall be used to shift the materials to the installation site.

1.2 Separate Earthing Systems will be provided for Low Voltage, Extra Low Voltage, and Lightning Protection.

1.3 Copper bonded rod of sizes 16mm/19 mm dia, shall be used as per project specifications. Necessary couplers shall be utilized to extend the length.

1.4 Buried earthing conductors are connected with approved accessories /exothermic Welded (Cu to Earth rod) to be laid at a depth as required and as per approved shop drawing details.

1.5 Earth pits using earth rod electrodes shall be installed with the latest approved drawings.

1.6 Soil resistivity test to be conducted on-site and report to be submitted for consultant approval.

1.7 Earth rod electrodes shall be installed where soil resistivity is low. Provision shall be made for connecting all incoming cables by welding/ earth connectors to the top of the rod.

1.8 No drilling of earth bar shall be permitted except in the main termination points.

1.9 Primary substation main earth mat shall be in the soil level directly beneath the substation.

Related Article: Method Statement for Installation of 33KV Power Transformer

2 Method of Installation for Static Grounding

2.1 Separate static Earthing Systems will be provided as per Shop drawings approvals.

2.2 Buried Bare Copper conductor Sizes shall be used as per Approved Drawings and Necessary Exothermic Welding accessories shall be utilized to extend the length / Joints.

2.3 Buried earthing conductors are connected with approved accessories /exothermic welding. The grounding conductor shall be buried below the finished floor level. Finishing grade unless otherwise specified in drawings.

2.4 Exothermic Welding joints as per manufacturer recommendation. Buried bonded conductor shall be connected with earth rods down contactors / Aircraft static Grounding Receptacle.

2.5 All Earthing Interconnections to the main grid shall be achieved by Exothermic welding.

Related Article: Method Statement for Installation of Cable Tray, Trunking and Accessories

3 Exothermic  welding procedures as per manufacturer recommendations

3.1 An exothermic welding system is a fusion of high conductivity, high copper content alloys which produces a molecular weld. This weld has at least twice the cross-sectional areas of the conductors being joined and a current-carrying capacity equal to or greater than that of the conductor, enabling it to withstand repeated fault current. The weld will not loosen or corrode and is an integral part of the conductor.

3.2 Position cleaned conductor in mould after ensuring mould is dry by pre-heating or making joints.

3.3 Lock mould with handle clamp and place metal retaining disc in bottom of mould crucible.

3.4 Pour weld power into mould and of starting power on edge of mould for easy ignition.

3.5 Close mould lid securely.

3.6 Ignite starting powder using a flint gun.

3.7 Reaction takes place and waits for approx. 3 mins. to allow the metal to solidify before opening mould.

3.8 Remove weld and clean mould carefully before making the next connection.

Exothermic welding according to Wikipedia.org,

Exothermic welding, also known as exothermic bonding, thermite welding (TW),^[1] and thermit welding,^[1] is a welding process that employs molten metal to permanently join the conductors. The process employs an exothermic reaction of a thermite composition to heat the metal, and requires no external source of heat or current. The chemical reaction that produces the heat is an aluminothermic reaction between aluminium powder and a metal oxide.

4. Testing of Earth Resistance Value

4.1 Earth resistivity test to be conducted on-site and report to be submitted for consultant approval.

4.2 Grounds value separate earth electrode as per specification unless otherwise indicated in drawings.

4.3 Earth rod electrodes shall be installed as per approved shop drawings locations.

4.4 Minimum of 3600mm depth copper bond earth rod (each road 1200mm length x 3 Nose of rod) shall be provided with each down conductor and separately earth pits as indicated in drawings.

4.5 Check the connection(s) of earthing wire to earthing spike rod electrode.

4.6 On completion of the installation, the following measurement and / checks have to be made and the end result recorded in a checklist.

4.7 Each earth electrode and the earth have to be measured.

4.8 Two no’s of spike rod to be fixed for testing near-earth pit as follows the First rod to be fixed minimum distance 5000mm away from earth pit, second rod to be fixed minimum 10000mm away from earth pit.

4.9 3. No’s of testing wires to be connected to earth tester from earth pit and spike rods.

4.10 After connecting the testing wires measurement is to be observed.

4.11 Measure the resistance of the complete installation for earthing and lightning protection system and submit it for review to the Main contractor/consultant/client.

5 Materials

Copper tape

copper conductor

earth rods

Exothermic welding & Accessories

6 Equipment & Tools

Test Equipment

Task Lighting

Electricians toolbox

Drilling machine

Mechanical tools

Marker

Related Article: Method Statement for Laying of Low Voltage Cables and Wires

7 Proposed Control Measures to Reduce the Risks

7.1 Material transportation will be done by 1.5/ 3 ton pickup at the site. Loading and offloading material (only limited quantity of material allowed to be used at site.). All materials will be stored in a covered storage area and ensured 24 hrs security arrangements. All lifting will be conducted by (Main con) in accordance with (Main con’s) lifting requirements.

7.2 All operatives involved in handling material will be undergone a manual handling training program prior to start along with DSTI.

7.3 All machinery involved for loading and unloading of material will ensure safety compliance prior to use i.e. competency, certifications, fitness, inspections, etc.

7.4 All necessary permits shall be obtained from (Main con) HSE Dept for Exothermic welding operation. All the safety measures to be followed as per the method statement such as competent welder, adequate welding equipment, prescribed PPEs, fire fighting equipment, fire watcher, access restriction, warning signage, bucket with sand, area barricading, etc. Copies of all certificates available on site.

7.5 Ensure authorized person(s) to store handle and issue the chemicals and hazardous substances at the site.  Applications will be strictly in line with MSDS and COSHH Assessment. (dry flash point temperature 950 C°).

7.6 Appropriate personnel protective equipment such as welding apron, fire-resistant gloves, welding shield, chemical resistant gloves, eye protection, will be provided.

7.7 Hand tools and power tools:  All hand tools and power tools (110 V) to be inspected prior to start.PAT tested and mark with current color code.

7.8 General safety precautions

7.8.1 Ensure close monitoring and supervision by competent personnel, continuous monitoring by HSE professionals.

7.8.2 Task briefing and regular toolbox talk to be conducted to all employees by the concerned supervisor prior to start.

7.8.3 Emergency response procedure to be communicated in the pre-task briefing.

7.8.4 Safe access and egress for a worksite to be maintained and housekeeping ensured.

7.8.5 User, storage, content to include checking and eliminating the potential of moisture contaminations.

7.8.6 Exclusion zone will be ensured.

7.8.6 Ensure the first aid, fire fighting, drinking water, restroom, eye washing, and other welfare facilities at the site.

7.8.7 Appropriate signage’s to be posted and housekeeping and frequent cleaning at all times.

7.8.8 Adequate lighting, supervision, and safety cover will be ensured if any task is on the extended hours.

7.8.9 Ensure the welfare arrangements at the site.

Did you follow the above method statement for the installation of earthing and lightning protection systems?

Hi friends! Are you searching for a contractor to construct your project? NMC wants to share a post. Enjoy! 

There are many best construction companies in the Philippines today that are capable of doing different types of projects such as houses, roads, bridges, towers, malls, and more but what I will discuss here are the best construction companies that are capable to undertake any project.

Some Clients today are keen on searching for a construction company that is responsible and with a sense of integrity.  They are tired of dealing with incapable and undocumented stakeholders or trades.

They are after legitimacy, not just legitimate contractor but the quality of work is of high importance in order achieve the expectation of the client.

Here we are, and let’s not take it any longer because I know your time is important to you.

So here are the “Top 10 Best Construction Companies in the Philippines” that you need.

1. NMADES Construction

NMADES Construction or NMC is based in Puerto Princesa City, Palawan, Philippines. They have an office in Gabinete Rd., Purok Masikap, Barangay Bancao-Bancao, Puerto Princesa City. They started the construction industry in 2020 as of this writing they have been in the industry for two years.

NMADES Construction is considered one of the best construction companies in the Philippines because of its strength, experience, character, and integrity.

The staff of NMADES Construction has international experience so they have an advantage when it comes to construction they have learned abroad, especially in the methodology and quality of work. They showcase their industry due to their international experience. If you are the Client who will build the house or any project, you will not make the mistake of hiring them.

NMC has social media followers, 631 followers on Facebook, 170 followers on other social media profiles.

NMC’s services:

1. Design and Construct
2. Architectural Design
3. Contracting/Contractor
4. Structural Design & Analysis
5. Management and Consultancy
6. Subcontract works such as painting, tile works.

There projects:

1. One Unit Apartment
2. New Full Turn-Key SMART Celsite Project
3. Boundary Wall/Fence Project

Related Article: 15 Basic Steps of Construction

2. MEGAWIDE Construction Corporation

Megawide Construction Corporation is considered as one of the leading and best construction companies in the Philippines. MCC is based in Quezon City, Philippines. They have an office at 20 N. Domingo St., Brgy. Valencia, Quezon City. Megawide was founded in 1997 they have been in the industry for 25 years as of this writing. MCC started as a med-size construction company but after 25 years they have achieved a market capitalization of Php 15 billion or $300,000,000 (P50 per dollar as of this writing).

Megawide has the ability to do large projects like Airport, Long-span bridges, Malls, etc even they can develop new cities.

MCC’s services:

1. Engineering
2. Procurement
3. Construction
4. Airport Infrastructure
5. Transport-oriented Development

Their project projects:

1. Greenfield International Airport Mopa- North Goa
2. Mactan – Cebu International Airport
3. Clark International Airport

3. STA CLARA INTERNATIONAL Corporation

SCC started in 1976 and it’s a solely-owned company and is also one of the leading and best construction companies in the Philippines. SCC provides full-service engineering, construction, development, and management enterprise in the Philippines, with overseas operations, serving the Power and Utilities, Infrastructure, and Civil Engineering sectors.

The SCC head quarter is located at Highway 54 Plaza 986 EDSA corner Stanford Street, Barangay Wack-Wack Mandaluyong, Manila, Philippines. So far they have approximately 6,000 employees in all their locations. They also have affiliated companies overseas such as Santa Clara Oman LLC, Santa Clara International PNG Ltd.

SCC Services or Industry:

1. Architectural
2. Engineering
3. Related Services

SCC Projects:

1. JTI PLEX Project
2. Mega Mall
3. Subi-Clark-Tarlac Expressway Package 1

4. MAKATI Development corporation

The MDC had succeeded due to its good management practice, prioritizes the principles, especially in the system of quality and management. They also prioritize the benefit of the people who work for them.

MDC started the construction industry in 1950, formerly a unit within Ayala Corporation’s Real Estate Division (RED). And in 1974 MDC Makati Development Corporation was established and embarked on its first residential, infrastructure, and building projects. After 48 years (as of this writing) MDC became the top 10 best construction companies in the Philippines.

MDC’s office is located at MDC Corporate Center Radian Street, Arca South Estate Western Bicutan, Taguig City.

MDC has social media followers, they have 10,670 Facebook page likes and 655 Instagram followers.

Their services:

1. Engineering
2. Procurement
3. Construction
4. Construction Management

Their 3 best construction companies projects:

1. Ayala Malls Manila Bay
2. Arbor Lanes
3. Ayala Malls Vermosa 

5. EEI Corporation

Engineering Equipment Incorporated or EEI is known as one of the leading and best construction companies in the Philippines. EEI Corp has the broadest range of construction and engineering services, with expertise in the construction of large-scale heavy and light industrial projects, infrastructure projects, and property development projects across the globe. As such, it is a preferred contractor of global Engineering, Procurement, and Construction Companies.

EEI Corp. is headquartered in 12 Manggahan St., Bagumbayan, Quezon City 1110, Philippines. They started their venture in the industry in 1931. In today’s time, EEI Corporation’s achievement has grown up and formed several companies.

They also write news updates of their company. Here are some of EEI’s amusing news.

1. Build a Propane Dehydrogenation (PDH) Plant in Saudi Arabia.
2. EEI gearing up for more ‘ mega ‘ projects after follow-on offering
3. EEI Achieves Quadruple-A Rating

Their Services:

1. Infrastructure
2. Buildings and properties
3. Industrial Facilities
4. Steel fabrication

EEI Corp’s projects:

1. Herozontal and High-rise projects in Metro Manila
2. Middle East Projects
3. Asia Pacific Projects

6. DATEM, Inc.

Datem Inc. is headquartered in 99 Mindanao Avenue, Bgy. Bahay Toro, Quezon City, Philippines. Ang Datem Inc ay na itatag noong 1984 ng tatlong mapitagang mga enhinyero at arkitekto.

After 38 years (as of this writing) DATEM became one of the leading construction companies in the Philippines, accredited as a Quadruple A contractor by the Philippine Contractors Accreditation Board (PCAB), the implementing agency of the Construction Industry Association of the Philippines (CIAP).

If you work with DATEM Inc. you will feel that you are in the right hand.

Here are their services:

1. Engineering
2. Procurement
3. Construction

Their Prestigious Projects:

1. Hotel and Resorts Projects
2. Commercial and Recreational Projects
3. Residential (High-rise buildings)

Related Article: How Construction Specification Could Help You Build A Huge Project

7. DMCI 

DMCI is one of the leading and best construction companies in the Philippines. The company was established and incorporated in 1954. The DMCI’s company name was formed from the name of the owner David Mendoza Consunji. DMCI was started in humble beginnings. Their projects were residential houses at that time, up until the construction of several multi-storey buildings. Several years passed by, most of the projects that DMCI worked on are hospitals, offices, and residential buildings.

DMCI is headquartered in DMCI PLAZA BUILDING. 2281 Chino Roces Avenue Extension, 1231 Makati City, Philippines

DMCI operates in four key construction segments: building, energy, infrastructure, and utilities and plants.

If you think they can undertake your project on a large-scale contact them via their website.

DMIC has social media that you can reach out to. They have 54,715 followers on Facebook, 11,800 Followers on Instagram, and 16,710 followers on Linkedin.

Their Services:

1. Building construction
2. Power plants
3. Housing
4. Heavy lifting
5. Civil Works

DMCI Projects:

1. Skyway Stage 3
2. Presidential Security Group Hospital
3. North South Commuter Railway

8. MONOLITH Construction and Development Corporation

Monolith Construction & Development Corporation is a 100% Filipino corporation that started its industry and registered with the Securities and Exchange Commission in November 1990. Prior to this date, the company under the name of Monolith Builders, Inc. had been able to undertake several projects ranging from warehouses to residential and commercial buildings in Metro Manila and other cities in the south from 1987 to 1990.

Monolith is headquartered in 10F MPIRE CENTER 93 West Ave. Brgy. Bungad Quezon City, Metro Manila, Philippines.

Monolith has social media followers, 15,229 followers on Facebook.

Their Services:

1. Building construction
2. Procurement
3. Engineering

Their projects:

1. Hotels or Residential
2. Commercial or Office
3. Malls

9. DDT Konstract, Inc

DDT Konstract Inc. (DDTKI) is one of the leading and best construction companies in the Philippines with proven expertise in all types of general building construction.

From the simple vision of its founder to establish success in his chosen field, the company was formed and subsequently expanded to take on greater challenges of helping shape the construction landscape and build the nation through malls, schools, office buildings, residential condominiums, and many other infrastructure projects.

DDT Konstract Inc services:

1. PRE-CONSTRUCTION
2. General Construction
3. Construction Management
4. Design and Build

Their Projects:

1. Shore 3 Residences
2. Cebu Exchange
3. Udenna Tower

Related Article: 5 Top Countries In The Middle East That You Can Work In Construction

10. Atlantic, Gulf & Pacific Company (AG&P)

Atlantic, Gulf and Pacific Company of Manila (AG&P) is Headquartered in 28th Floor, Tower 2, Insular Life Corporate Center Insular Life Drive, Filinvest Corporate City, Alabang Muntinlupa City, 1781 Philippines, AG&P is one of the world’s fastest-growing providers of LNG import and LNG and gas logistics, distribution and infrastructure solutions.

AG&P has social media and they have 34,828 followers on Linkedin, and 7,580 followers on Facebook.

Their Services:

1. Develop LNG import and regasification facilities
2. downstream city gas networks
3. Engineering and Project Management

AG&P Projects:

1. LNG Terminal, edible oil depot and oil depot
2. Assorted LNG projects

These are the top 10 best construction companies in the Philippines that every client can rely on in undertaking small, medium to large-scale projects.

Which of the above companies do you like most? Do you have projects to build? 

If you enjoyed reading this post, please share this with your favorite social media network. Thank you! 😘

Author Bio: NMADES Construction or NMC is a solely-owned construction company based in Palawan, Philippines. They have been in the construction industry for over two years now. They are a general contractor willing to undertake any type of project. To connect with NMC, check out their website www.nmadesconstruction.com or message them on their Facebook page. 

Casting concrete for the vertical element is an important thing to discuss because this activity involves high risk.

1. Title

Method Statement for Casting Concrete for Vertical Element

2. Scope of Work

2.1 General Description

The purpose of this method statement for casting concrete for vertical element is to describe the measures and ways of completing concrete pour work for vertical elements on this Project (columns, walls, water tanks walls, core walls, retaining walls). The work shall include working area preparation, precautionary measures, application, finishing, inspection & testing.

2.2 Equipment/Tools

A. Heavy Equipment
 Truck Mixers
 Concrete Pump
 JCB/Bobcat

B. Activity Equipment

 Concrete Vibrator
 Survey instrument
 Metal tape
 Wheel borrow
 Shovel
 Hammer/rubber hammer
 Scaffolding

2.3 Materials/Reference

2.3.1 Materials
 Concrete: Grade 60/20

2.3.2 Reference
 Specification

 Drawing (See QA/QC table below)

2.4 Site Planning and Preparation for Casting Concrete for Vertical Element

2.4.1 Material Delivery

The fresh concrete shall be delivered to site via truck mixer. A concrete pump shall be sent to the site ahead of the scheduled time to start casting concrete due to preparations. Extra concrete pump shall be provided depending on the volume of concrete required for the pour.

2.4.2 Transportation

The concrete shall be delivered to site and concrete checks to be carried out by a QA/QC Engineer before sending to the proper site of casting.

2.5 Work Methodology for Casting Concrete for Vertical Element

2.5.1 Element corners will be determined and marked by the surveyor on the exact position.

2.5.2 Scrabbling will be made for any old concrete surface to receive new concrete.

2.5.3 Steel bars will be fixed according to the approved drawing.

2.5.4 MEP work should be done and be inspected for approval by MEP engineer.

2.5.5 In case of opening, shuttering box will be provided with additional steel bars.

2.5.6 Element side shutter will be fixed, one side will remain open, I.R will be submitted to the engineer for approval.

2.5.7 After engineer approval, the side shutter should be closed to conform to the shapes, lines, grades, and dimensions of the concrete shown on the drawings.

2.5.8 Inspection request for pouring concrete will be issued to the engineer for approval.

2.5.9 Ready-made concrete shall provide from batching plants approved by the consultant.

2.5.10 Placing of concrete could be by pump or by crane pocket according to the site circumstances.

2.5.11 In case of congested steel throw element concrete access will be made throw side shutter to insure well placing and compaction for concrete.

2.5.12 Number of 3 vibrators will be with each concrete pump to improve well compaction for concrete. One vibrator at will be on stand by with each concrete pump. Vibrator should available with diameters 1.5″, 2.0″, 2.5″.

2.5.13 Computerized delivery ticket shall be checked for conformity as per the approved mix design.

2.5.14 Slump and temperature should be carried from each concrete truck mixer; allowed slump will be 125+\-25 mm. maximum temperature will be 32.

2.5.15 All data above (2.5.13 &v2.5.14) be recorded in the daily concrete schedule sheet (pour card) and to be submitted the next day of pouring. Cube the register will be maintained and to be produced along with cube test reports.

2.5.16 Required tests (compressive strength and durability) will be directed by the engineer along with the approved inspection request.

2.5.17 Concrete at truck mixer shall not exceed more than 90 minutes from adding water to the mix.

2.5.18 On acceptance, the mix shall be directly unloaded in the concrete pumps.

2.5.19 Concrete should place on horizontal layers of a maximum of 300 mm thick. Each layer shall be placed and compacted by vibrators before receiving the next layer .layers should be placed before the initial set to the previous layer. The vibrator nose should go through layers.

2.5.20 Shutter will be opened after 48 hours for vertical concrete element 60Mpa or more strength, otherwise it will be 24 hours.

2.5.21 Curing shall be carried out for the surface in a period of 7 days by means of spreading a Hessian cloth to cover all sides and keeping it moist by regular spraying of water or by applying of curing compound within 2 hours of shutter removal.

2.6 Safety for casting concrete for vertical element

2.6.1 All operatives shall be given safety induction training by the safety
the officer before starting work.

2.6.2 Care should be taken in the handling of materials during loading & unloading & shifting to the working area.

2.6.3 Proper lighting to be provided as required on site.

2.6.4 Necessary PPE to be used by all operatives for the casting concrete for vertical elements so that operatives are protected and to be able to reduce the risk of hazard.

2.6.5 Secure & good quality Scaffolding to be provided.

2.6.6 Secure access to be provided for concreting on Site (i.e. ladders &
platforms).

2.7 Safety Roles and Responsibility

2.7.1 HSE officer will be involved in all safety measures related to [Company] scope of works. An environmental officer is checking for oil spills and housekeeping.

Related Article:

1. Method Statement for Raft Slab Concrete Pouring
2. Method Statement for Stone Finish GRC Fabrication And Erection

2.8 Organization, Responsibilities, and Supervision

2.8.1 Project Manager

 Is overall responsible for the implementation of the approved method statement for casting concrete for vertical element, specifications, drawings, and ensure that his team of Engineers and foremen are aware of it; all resources, humans, materials, and equipment are available to carry out the work as planned without any delay.

2.8.2 QA/QC Manager

 Improving quality assurance processes and practices. Involved in the recruitment and mentoring of QA/QC Engineers.
 Developing and driving continuous improvement initiatives. And overseeing and coordinating the investigation of Customer Complaints and Non-conformities.
 Investigating incidences of staff non-compliance with procedures.  And Carrying out a routine sampling of products produced. Writing up Quality Assurance manuals.
 Preparing for third-party and internal audits.
 Ensuring that internal and external audits are properly carried out.
 Assisting with the training and development of staff.
 Dealing with technical issues as they arise.
 Maintaining the company’s Standard Operating Procedures
(SOP) system.
 Managing the factory internal audit program.
 Ensuring that corrective action is taken to rectify any shortcomings.
 Improving relationships with contractors and suppliers.

Did you follow the above method statement for casting concrete for vertical element? If not, please do so.

Do you know that GRP lining is the material we used inside the water tank of mostly high-rise buildings?

The purpose of GRP lining is to prevent the leakage of the tank because the water tank is just made of concrete. So to prevent water from leaking this material is advisable to apply.

In this method statement, I will show you how to properly install a GRP lining even if you are a newbie applicator.

1. Title

Method Statement for Installation of GRP Lining to Water Tank at Basement

2. Purpose

The purpose of this method statement is to describe the measures and system, a procedure that will be adopted for GRP lining installation to the basement water tank. This method statement has been prepared based on the method statement from the specialist included in the material submittal n0. (place your number here) already approved by the engineer,

3. Materials

• Polyester resin

• Chopped strand matt

• Gel

• Catalyst M-50

• Putty

4. Methodology

4.1 Before lamination or lining works the concrete surface preparation work would be carried out by removing any loose particles laitance, dust, oils, grease (if any) to the satisfaction of the specialist subcontractor for this works. Any honeycomb or segregation would be repaired with approved materials as per manufacturers’ recommendations. All corners would be made curved (acceptable to the specialist subcontractor) before applying GRP lining.

4.2 GRP lamination works would be carried out in the sequence of ceiling, then wall, and finally the floor.

4.3 After removing the dust and cleaning the surface, for first layer putty filling would be done and resin coating would be applied as undercoat.

4.4. For 2nd layer, 450mm chopped strand mat would be laminated by applying with unsaturated polyester risen to obtain 1 mm thickness.

4.5 For 3rd layer the same procedure would be followed (1 mm thickness).

4.6 For 4th layer the same procedure would be followed (1 mm thickness).

4.7 For 5th layer thick white gel coat would be applied for filling the pinholes as a final coating (1.0 mm thick) and would be allowed to dry. The total thickness of GRP lining would be an average of 4 mm.

4.8 General lap length for the lamination process would be 10cm. At corners between floor or wall and wall or ceiling, the strand mat sheet (120 cm width) would be laid centrally with 60cm on either side. No other special treatment is required at corners as advised by the specialist.

4.9 Lining around the pipes inside the tank would be as per the attached sketch.

4.10 All necessary MEP services would be installed and related clearance would be obtained prior to commencement f the lamination work.

4.11 Inspection request would be submitted to the engineer before and after completion of GRP lining works inside the tank.

5. Filling water in the tank

5.1 After approval of the engineer and after receipt of the inspection request the filling of water can then commence.

5.2 Full curing time of the lining in the normal temperature is 24 to 48 hours but as this is the underground tank, it is recommended to fill water 3 to 4 days after the completion of laminations works.

Related aricles:

1. Method Statement for Application of Waterproofing Membrane
2. Method Statement for Liquide Applied Bituminous Waterproofing
3. 7 Actionable Steps to Avoid Water Leakage for Your Underground Structures

6. Safety

6.1 Confined space work permit system would be strictly implemented and followed as per the company’s project safety plan.

6.2 The health risk involved in working with these materials in confined spaces (such as suffocation, exposure to material vapor or fumes, etc.) would be given priority while making safety arrangements.

• All persons entering inside water tank would be briefed (every time) regarding safety precautions and hazards.

• Proper ventilation would be provided with an exhaust fan near the opening.

• Near entrance or exit extra person would be deployed to keep a continuous watch inside and maintain communication with the person working inside.

6.3 Skin and eye contact should be prevented by providing rubber gloves, eye goggles, protective clothing to the crews.

6.4 Only experienced applicators under the supervision of an experienced supervisor would carry out the works.

6.5 Proper scaffolding and lighting would be arranged.

6.6 Company safety crew would be always alert and present outside the tank during the activity in order to adopt necessary urgent action in case any worker becomes sick or ill inside the tank.

If you are a quality engineer you have to make sure that the above method statement is followed by the subcontractor or applicator.

If you are a client and if you want to ensure the quality of the application of GRP lining you can hire a quality engineer or consultant to see to it that the works are as per approved drawing and as per related documents such as method statement, inspection and test plan, checklist, project quality plan , etc.

Did you follow the above method statement in the application of your installation of grp lining? 

1. Title

Method Statement for Shoring Wall Blockwork

2. Scope of Work

2.1 General Description

2.2 The purpose of this method statement for shoring wall block work is to describe and cover the
measures and ways of shoring wall blockwork. The work shall include working area preparation precautionary measures application & finishing.

2.3 Equipment/Tools

A. Heavy Equipment
 Mechanical Mixer
 JCB/Bobcat

B. Activity Equipment
 Aluminum straight edge/Level guide
 Plumb bob/Spirit level
 Metal tape
 Wheel borrow
 Shovel
 Hammer/rubber hammer

2.4 Materials/Reference

2.4.1 Materials
 Hollow block/Concrete Masonry Unit (CMU)
 Mortar sand and cement

2.4.2 Reference
 Specification
 Drawing (See QA/QC table below)

2.5 Site Planning and Preparation

2.5.1 Material Delivery
The blocks will be delivered via truck or mini truck depending on the volume requirement on site.

2.5.2 Storage
The blocks will be stored in the storage yard. It will only be delivered to the site a few days before commencing. It will be placed on a wooden batten or palette to avoid contact on the ground.

2.5.3 Material Check

The blocks when arrived will be checked by a QA/QC Engineer before unloading to the store yard. The delivery note will be taken by QA/QC Engineer to check and make sure that it is as per the approved material submittal.

2.6 Work Methodology for the Method Statement for Shoring Wall Blockwork

2.6.1 Area below shoring wall (thickening) to be prepared and cast with 25N/mm2 PCC blinding up to the given levels.

2.6.2 The first course should be laid as per the engineer’s drawings. Work should be submitted to the engineer by inspection request before establishing with the second course. If 200mm blockwork or CMU is not possible according to site condition, a 150mm block wall will be provided.

2.6.3 The mortar shall be of cement/sand 1:4 by volume. Measurement boxes to be used to controlling of the mix volume. Water shall be added.

2.6.4 All Blocks shall be wetted by water before being used.

2.6.5 Blockwork shall be carried up in a uniform manner not more than 6 courses in a day.

2.6.6 All Blockwork or CMU shall be plumbed vertically. Joints at the block wall face should be flush to receive a waterproofing system and inspected as per the attached form.

2.6.7 A Reinforced concrete Bond column (Stiffener) having a width of 20cm and depth equal to the wall thickness reinforced with 4 T10 & T8 @ 20cm stirrups, shall be provided in all Blockwork walls at a span of 8 meters if the block wall is 20 and 6 meter if block wall is 150mm.

2.6.8 Anti-termite will be sprayed to the top of the backfilling every 120 cm as per the attachment requirement of an anti-termite subcontractor, protection measures will be taken to prevent anti-termite from damages if not covered with blockwork.

2.6.9 Inspection request to be submitted along with checklist after completing the bock wall.

2.6.10 Block wall face finishing will be done according to the waterproofing subcontractor requirements for acceptance.

2.6.11 All block surfaces shall be cured for a period of 3 days.

2.6.12 Once the raft slab in cast wailers will be removed by D.F including
any protection.

2.6.13 The blockwork will be built up to the finishing levels as previously
described.

2.6.14 For the higher courses a mobile scaffold will be used.

2.7 Safety

2.7.1 All operatives shall be given safety induction training by the safety
the officer before starting work.

2.7.2 Care should be taken in the handling of materials during loading & unloading & shifting to the working area.

2.7.3 Proper lighting to be provided as required on site.

2.7.4 Necessary PPE to be used by all operatives.

2.7.5 Secure & good quality Scaffolding to be provided.

2.7.6 Secure access to be provided for concreting on Site (i.e. ladders &
platforms).

2.8 Safety Roles and Responsibility

2.8.1 HSE officer will be involved in all safety measures related to [Company] scope of works. An environmental officer is checking for oil spills and housekeeping.

2.9 Organization, Responsibilities, and Supervision.

Related Article:

1. Method Statement for Constructing Ground Beams
2. Method Statement for Installation of Kerbstone and Interlock Tiles
3. How To Make A Good Method Statement

2.9.1 Project Manager

 Is overall responsible for the implementation of the approved method statement, specifications, drawings, and
ensure that his team of Engineers and foremen are aware of
it; all resources, humans, materials, and equipment are
available to carry out the work as planned without any delay.

2.9.2 QA/QC Manager
 Improving quality assurance processes and practices. Involved in the recruitment and mentoring of QA/QC
Engineers.
 Developing and driving continuous improvement initiatives.
And overseeing and coordinating the investigation of Customer Complaints and Non-conformities.
 Investigating incidences of staff non-compliance with procedures. And Carrying out a routine sampling of products
produced. Writing up Quality Assurance manuals.
 Preparing for third-party and internal audits.
 Ensuring that internal and external audits are properly carried out.

Did you follow the above Method Statement for Shoring Wall blockwork? Comment down if you do.

Here is the “Method Statement for Raft Slab Concrete Pouring.’ You as an engineer should study this so that you are able to execute the proper method or procedure when it comes to raft slab concrete pouring or raft slab construction.

Table of Contents

1. Title
2. Scope of Work
2.1 General Description
2.2 Equipment/Tools
2.3 Materials/Reference
2.4 Site Planning and Preparation
2.5 Work Methodology
2.6 Safety
2.7 Organization, Responsibilities, and Supervision
2.8 Workforce
3. Environmental, Safety and Health
3.1 Risk Assessment
4. Quality Assurance
4.1 Quality Requirements Table
5. Appendices and Reference
6. Briefing Sheet
7. Review Checklist

1. Title

Method Statement for Raft Slab Concrete Pouring

2. Scope of Work

2.1 General Description

The purpose of this method statement for raft slab concrete pouring is to describe the measures and ways of completing concrete pour works for raft foundation on this Project. The work shall include working area preparation, precautionary measures, application, finishing, inspection & testing.

2.2 Equipment/Tools

A. Heavy Equipment
 Truck Mixers
 Concrete Pump
 JCB/Bobcat

B. Activity Equipment
 Concrete Vibrator
 Survey instrument
 Power float machine
 Metal tape
 Wheel borrow
 Shovel
 Hammer/rubber hammer

2.3 Materials/Reference

2.3.1 Materials
 Concrete: Grade 45/20

2.3.2 Reference
 Specification
 Drawing (See QA/QC table below)

2.4 Site Planning and Preparation

2.4.1 Material Delivery

The fresh concrete shall be delivered to the site via truck mixer. A
concrete pump shall be sent to site ahead of the scheduled time to
start casting concrete due to preparations. Extra concrete pump
shall be provided depending on the volume of concrete required for
the pour.

2.4.2 Site Access

The space between the boundary fence and shoring is very restricted we, therefore, intend to make use of the central area by leaving the ground slab out until removal of cranage. Leaving sufficient time to infill ground slab, construct pools and landscaping. During this time, ramp access will be maintained in the area of J & K building to supply all buildings this ramp will eventually be substituted by the permanent structure.

In the cranage layout, much consideration is made of the ability to pick up from wagons outside the site boundary fence. There “pick up” areas must be kept clear of obstruction and storage during the tower crane period.

Pedestrian access ramp/stair tower will be set up in the corner adjacent to building C – D.

2.4.3 Strategy for the raft slab concrete pouring

It is intended to have 3 management teams looking after different
blocks. Team “A” will be responsible for the raft working in the direction E – W. As they finish at Block J – K, they will continue
vertically on Blocks J and K.
Team “B” will commence on block D as soon as the raft is complete
for that area. They will work progressively to C, B, and A to complete
one half of the complex.

Similarly, Team “C” will commence on Block E as the raft area is released and progress through to Blocks F – H.

At the peak, all blocks will be active which will require considerable
crane hook time.

The majority of structural concrete will be pumped either from outside the site boundary or from the central area of the raft.

2.5 Work methodology for the method statement for raft slab concrete pouring.

2.5.1 Blinding works:

2.5.1.1 After receiving an acceptable formation from (Subcontractor of foundation) i.e. within -20mm + 10mm tolerance, the designated area described on the RFI sheet will be treated and covered with 500 gauge polythene level controls (screeds) will be placed on the surface of the compacted stone.

A 25N mix of high slump concrete blinding will be poured using a pump or direct from the Mixer Truck and spread with rakes and tamps. The surface will be toweled off using “Bull Floats” or Power Floats depending on the setting time of the concrete.

2.5.1.2 In order to minimize shrinkage, cracking the area will be covered over with polythene and welted down or use as a proprietary curing spray.

2.5.1.3 On completion of a zone to be handed over for waterproofing, a joint inspection would be made to identify unacceptable lumps and projections which would be ground off.

2.5.2 Waterproofing application:

2.5.2.1The prepared area would be cordoned off and handed over to
the specialist sub-contractor for application of the 2 layer Bitumen membrane in accordance with the specification. A protection layer will be applied comprising of a 40mm cementitious screed.

2.5.3 Reinforcement installation:

2.5.3.1 It is intended to cut and bend rebar on-site in accordance with prepared bending schedules which accord with the bay layout for the raft slab. The installation of reinforcement will not progress beyond the bay to be concreted in order to allow access to construct
stop ends.

Please note that you should strictly follow the method statement for raft slab concrete pouring.

The splice location will be followed up as per approved bar bending schedule (BBS) shop drawings. The top mat will be supported on chairs from the bottom mat which in turn, will be supported on high-strength concrete blocks of the correct thickness.

2.5.4 Bay Layout:

2.5.4.1 The bay layout and pour sequence shall broadly follow the attached layout. This may vary to suit site conditions. The pour sequence will avoid adjacent bays being cast within 24 hours.

2.5.4.2 The layout also avoids joints through main substructures.

2.5.5 QA/QC Procedure:

2.5.5.1 Inspection Request will be submitted for completed raft slab concrete pouring for the approval of the engineer after Municipality Engineer approval. All related subcontractors’ acceptance will be obtained.

2.5.5.2 Ready-made concrete shall provide from batching plants approved by the consultant. The rate of concrete supply will be 80 – 120 M3 per hour.

2.5.5.3 Quantity of concrete, supervising staff and labor, number of
pump and location and, machinery required, expected duration will be submitted before casting.

2.5.5.4 Number of 2 concrete pumps will be available on-site; the extra pump will be on stand by ready for any incident circumstances.

2.5.5.5 Number of 3 vibrators will be with each concrete pump to improve well compaction for concrete. One vibrator will be on stand-by with each concrete pump. Vibrator should available with diameters 1.5″, 2.0″, 2.5″.

2.5.5.6 Computerized delivery tickets shall be checked for conformity as per the approved mix design.

2.5.5.7 Slump and temperature should be carried from each concrete truck mixer; allowed slump will be 125+\-25 mm. maximum temperature will be 32.

2.5.5.8 All data above (2.5.5.6 & 2.5.5.7) be recorded in the daily concrete schedule sheet (pour card) and to be submitted the next day of pouring. Cube register will be maintained and to be produced along with cube test reports.

2.5.5.9 Required tests (compressive strength and durability) will be directed by the engineer along with the approved inspection request.

2.5.5.10 Concrete at truck mixer shall not exceed more than 90
minutes from adding water to the mix.

2.5.5.11 For each bay, one source of concrete will supply the concrete.
In this case, the bay will be zoned for recording the sources
of supply.

2.5.5.12 On acceptance, mix shall be directly unloaded in the concrete
pumps.

2.5.5.13 Concrete should place on horizontal layers of a maximum 300 mm thick. Each layer shall be placed and compacted by vibrators before receiving the next layer .layers should be placed before the initial set to the previous layer. The vibrator nose should go through layers.

2.5.5.14 When concrete reaches a proposed level, initial hand troweling will be carried out then the finished surface will be power floated. A slope of 1:300 toward the catch basin will be controlled by Screed rails fixed on top of the surface.

2.5.5.15 After the concrete has been set, curing shall be carried out to the horizontal surface for a period of 7 days by means of spreading a Hessian cloth to cover all areas and keeping it moist by
regular spraying of water. For vertical surfaces along with the constriction joint, a curing compound will be applied within 2 hours from removing the side shutter.

2.5.5.16 Construction joints will be scrabbled to prepare a good bonding surface between old and new concrete.

2.5.5.17 Survey report for concrete surface level will be submitted.

2.6 Safety

2.6.1 All operatives shall be given safety induction training by the safety officer before starting work.

2.6.2 Care should be taken in the handling of materials during loading & unloading & shifting to the working area.

2.6.3 Proper lighting to be provided as required on site.

2.6.4 Necessary PPE to be used by all operatives.

2.6.5 Secure & good quality Scaffolding to be provided.

2.6.6 Secure access to be provided for concreting on Site (i.e. ladders & platforms)

2.7 Safety Roles and Responsibility

2.7.1 HSE officer will be involved in all safety measures related to [Company] scope of works. The environmental officer is checking for oil spill
and housekeeping.

Related Article:

1. Method Statement for Assembly of 200 Ton Crawler Crane
2. Method Statement for Epoxy Risen Floor Coating System
3. Method Statement for Painting Works for External Concrete Beam

2.8 Organization, Responsibilities, and Supervision

2.8.1 Project Manager

 Is overall responsible for the implementation of the approved method statement for raft slab concrete pouring, specifications, drawings, and ensure that his team of Engineers and foremen are aware of it; all resources, humans, materials, and equipment are available to carry out the work as planned without any delay.

2.8.2 QA/QC Manager

 Improving quality assurance processes and practices involved in the recruitment and mentoring of QA/QC Engineers.

Developing and driving continuous improvement initiatives.
And overseeing and coordinating the investigation of Customer Complaints and Non-conformities.
 Investigating incidences of staff non-compliance of procedures. And Carrying out routine sampling of products
produced. Writing up Quality Assurance manuals.
 Preparing for third party and internal audits.
 Ensuring that internal and external audits are properly carried out.
 Assisting with the training and development of staff.
 Dealing with technical issues as they arise.
 Maintaining the company’s Standard Operating Procedures
(SOP) system.
 Managing the factory internal audit programme.
 Ensuring that corrective action is taken to rectify any shortcomings.
 Improving relationships with contractors and suppliers.
 Supporting the marketing, commercial and business development functions of the company.
 Providing input into development protocols.

2.8.3 QA/QC Engineer
 Check all the related drawings for mezzanine deck slab ar approved for execution.
 Ensure that the storage area is ready to receive materials.
 Check the materials delivered to site as per approved drawings and supplier packing lists.

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