Below is a precise civil work method of statement that covers the detailed procedure for the scaffolding / formwork, rebar installation and concreting operation applicable for footing, pedestals and pile caps etc.
Also to explain how footing, pile caps, trenches, grade beam and grade slab work shall be carried out under controlled conditions.
Tools & Equipment
Below is list of necessary tools required for the work.
- Air compressor
- Hand tools, hand saw, wire cutter, brush, and measuring tapes
- Shovel
- Concrete Pump
- Vibrators
- Wooden float
- Drill, Grinder, Jig saw.
Pre Installation Requirements
Ensure the source of supply of ready mix and grade of concrete is confirmed, arrange initial trial mix and conduct specified test. Get approval of the trial mix from Client/consultant.
Arrange suitable onsite laboratory for concrete sampling and testing, and ensure availability of cube moulds, Thermometer, Slump cone etc. prior to the start of concrete pouring operation.
Spacer blocks with the same grade of concrete shall be arranged.
Coordinate with MEP department for the sleeves installation and MEP clearance.
Arrange the concrete testing area with proper shading and lighting.
Polythene sheets, hessian cloths sweet water etc. shall be arranged for the proper concrete curing.
Formwork Methodology
All materials forming temporary formwork should be clean strong and clear of any deflection even if they are new.
The shutters will be installed & fixed on the blinding as per the foundation layout.
25 mm chamfer shall be provided at all exposed edges.
Erect formwork to the dimensions and ensure that lines and levels are within the tolerances.
The shutters will be side supported by steel bars to maintain the proper alignment of the forms.
Tie rods shall be used for the proper alignment of the columns.
Layout and level shall be maintained by installing proper level guides.
Ensure that cover to concrete is provided as per the approved drawings and specifications.
Water Proofing Works
The clean surface of the blinding under the foundation will be water proofed/treated by the bitumen paint, bituthene sheet and 50 mm screed.
For vertical surfaces bitumen paint, bituthene sheet and protection board shall be used for water proofing.
Rebar Installation / Reinforcement Works
Prepare bar bending schedule as per approved contract drawings.
The reinforcement bars will be cut & bended as per the bar schedules.
Carry out cutting and bending using appropriate machinery and tools.
These bars will be aligned horizontally & vertically from the bottom & top as per the foundation schedule, structural details and notes.
The position, quantity and alignment of starter bar of column shall be done as per the approved drawings.
The top reinforcement will be supported on the bottom steel by mean of chairs for preventing bar sagging if required.
Intermediate bars all around the sides of the foundation/pile caps have to be provided.
Install Hooks, splices and embedment as per rebar installation drawings and specifications.
Fasten embedded items securely in proper position before placing the concrete.
Isolation and Expansion Joint Works
Isolation joint of 16 mm (or as applicable) shall be provided at the junction of grade slab with footing and grade beams.
Expansion joints with joint filler of 20 mm (or as applicable) shall be provided at location shown on the drawings.
Concrete Placement Method
Casting of concrete has to be done by means of pumps, and the pump access/length has to be sufficient to reach all the foundations in the plot with minimum numbers of shifts.
When the ambient temperature is more than 35⁰C concrete will be poured at the time as per the instruction of consultant. (In this case concrete schedule shall be after 8.00 PM).
Road for the pump must be provided to access to the plot and to operate safely.
Cubes from the supplied concrete will be prepared & tested as per the instructions of the consulting engineer.
Before casting of the concrete, the steel bars have to be sprayed with water to reduce their temperature (if required).
Deposit concrete continuously or in layers no deeper than 450 mm.
Concrete shall be placed from maximum height of 1.5 m to avoid segregation.
Minimum two vibrators for each pump operating must be presented for better performance while operating.
The vibration of the concrete has to be done at uniformly spaced locations. Place vibrators to rapidly penetrate placed layers at least 150 mm.
While vibrating corners and around reinforcement special care shall be taken to vibrate properly.
After completion of casting, enough number of workers must be available for the finishing works, cleaning and protection.
Field record of concrete shall be made.
Sample of cubes (7 and 28 days and for durability requirements) shall be taken as per the specifications and client/consultant/engineers instruction.
Removal of Shuttering
After 24 hours from the casting time, the side shutters have to be removed completely & the surfaces to be kept clean.
In the case of any honeycomb appearance on the surface, report to the consultant/Engineer and rectification shall be carried out as per the approved material and concrete repair method statement.
Concrete Curing
Concrete have to be cured by suitable sweet water.
All the surface of concrete/foundations will be covered by wet Hessian cloth to maintain the moisture level as per site conditions.
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