simple method statement of concrete casting

method statement for pile reinforcement and concrete casting method statement hq

Subsequent to the completion of the pile drilling, the borehole depth will be checked and verified versus the depth given on daily piling sequence and pile data. Only after borehole depth check can the cage be lowered into the borehole. A reference site datum level will be given to ensure the correct positioning of the cage with respect to cut off level.

The reinforcement for the piles shall be according to the requirement of the specification and the design of the pile. The reinforcement shall confirm to the mill certificate approved by the Consultant.

The reinforcement cages will be fabricated up to 18 m length pre coupling of 6 m + 12 m. The 18 m length reinforcement fixed with helical shall be lowered to the borehole. The cage shall be arrested in position, when it reaches 2.0 m above casing top level. Suitable crossbars shall be provided to keep the cage hanging in position. The reinforcement segments for 1200 mm diameter piles will be connected together using the couplers fixed to the end staggered at a minimum clear distance of 70 cm c/c to receive the second segment pile cage. The helical reinforcement / rings shall be fixed in place after connecting the two segments of reinforcement for 1200 mm diameter piles. The reinforcement shall be lowered to correct location and cage top level and secured from movement using hangers and arresters. The sonic coring pipes shall be connected by hand to push in the socket. The 4 nos. pipes shall be fixed to the cage at diametrically opposite sides by tying with binding wires at close intervals (50 cm C/C) before lowering to the borehole. The sonic pipes shall be end capped before fixing to the cage.

The maximum weight of the reinforcement cage will be approx. 9.0 tons. A lifting platform shall be used for the lifting of the steel cage without distortion. The steel cages will be lifted with the help of main crane (50 ton capacity) and an auxiliary crane (service crane of 35 ton capacity) shall be used to lift the lifting platform along with the steel cage. The lifting platform shall be released once the cage reaches 900.

Durable spacers shall be used at proper interval to keep the reinforcement in position. The spacers shall be of PVC material or cement concrete and as per approved sample for a clear concrete cover of 75 mm to the reinforcement. The first layer of spacers will be placed at 20 cm below cut off level. The spacing between spacers should be within 3 to 4 m and should terminate only 30 cm above pile toe.

The sonic logging will be carried out for preliminary piles and 100% of working piles. The sonic logging pipes of diameter 50 mm shall be fixed to the inner side of the cage at 4 diametrically opposite location for the full length of all the piles. Care shall be taken to avoid bend / damage to the pipes during installation and concreting. The top and bottom of the pipe to be capped in order to avoid ingress of grout to the pipe. The detailed method statement for sonic logging is available separately. The sonic coring pipes to be grouted after the testing using approved grout mix.

The pile concrete is delivered to site by means of truck mixers. The concrete will be received on site and the delivery ticket will be checked for correctness in accordance with the approved mix design. The quality checking and testing of the concrete to be carried out by an independent testing agency (I.T.A)

The concrete will be checked for the slump and temperature. Cubes will then be taken as per specification. The Concrete will be allowed to the site only after concrete quality has been found in compliance with specifications. The concreting of the drilled piles should be completed on the same date of completion of borehole. If there is an elapsed time of more then 6 hours between the completion of borehole & cage installation, cleaning bucket shall be carried out to clean the borehole.

The concrete shall be placed by tremie tube method, the tremie size will not be less than 150 mm. The tremie pipe is made up of sections with sufficient length to reach the toe of the pile and the joints provided with seals. The tremie pipe will be inserted at the center of the pile to reach upto the toe. The top of the tremie pipe will be connected to the concrete pump. The concrete shall be delivered directly from the transit concrete mixer to the concrete pump. If there is no pump available prior start of pouring, the concrete from the concrete mixer shall be delivered directly to the pile through the funnel connected to the tremie pipe of 250 mm diameter. The tremie pipe will be lifted 100 mm above pile toe level prior to concreting. A Styrofoam ball having a diameter slightly larger then the diameter of the tremie pipe shall be placed at the mouth of the tremie pipe to avoid contact of concrete with bentonite slurry / water in the tremie pipe. While concreting the length of the tremie pipe will be shortened if necessary but the tremie pipe will be maintained full time into the concrete of at least 2.0 m length. During the concreting the level of the concrete within the pile will be monitored by use of an end weight tape measure.

A sufficient quantity of concrete will be maintained within the tremie to ensure that the pressure from it exceeds that from the external water pressure. The concrete will be brought up to minimum 1.30 m above cut-off level and overflowing of concrete abovecasing top level will be carried out to ensure good quality and contamination free concrete at pile cut-off level. The concrete above the cut-off level will be chipped by the Main Contractor. The bentonite slurry / water displaced by the concrete will be pumped back to the desander or tank.

After concreting, the guide casing will be withdrawn by piling rig. When the casing is being extracted, a sufficient quantity of concrete shall be maintained within it to ensure that pressure from external water, bentonite slurry or soil is exceeded and that the pile is neither reduced in section nor contaminated. This applies for piles where the cut off level is below working platform.

The quantity of poured concrete volume will be measured & it will be compared with the theoretical quantity. The theoretical volume, actual volume & % over break will be recorded in the pile record sheet and plotted on a graph sheet for the submission to the main contractor.

concrete pouring method statement for construction work using ready mix concrete | project management 123

This civil work method statement shall address the requirements of project site operations applicable for the supply and placing of structural and nonstructural concrete pouring on the construction work project.

Following this method of statement will ensure that concrete works activity will be expedite in an efficient and safe manner in accordance with all relevant contract documents, (Specification and Drawing) and international accepted methods, utilizing proven methods and procedures, as detailed herein.

Pouring of cast in situ concrete in the project shall be in accordance with contract requirements and approved project specification, project safety procedure and approved issued for construction drawings.

Project Engineer / Construction Manager (Civil): In charge shall be responsible for coordination and supervision of construction works (activities) and construction groups, ensuring that work is done as per project specification and approved drawings, and all safety measures are implemented, of site construction and report to construction manager civil.

Site Engineer / Site General Foreman: Shall be supervising closely that activities designated to them ensuring that all instruction are followed strictly adhered to, this may involve providing alternative access routes for moving Traffic with Traffic Signs if necessary are in place prior to commencing the work, safety procedures of the project are strictly followed.

All the areas where excavation is required, the surveyor will give the information to the excavation foreman to start the excavation to the levels indicated in the issued for construction IFC drawings.

On specific areas where rate of concrete placement is to be very slow dry mix concrete will be delivered to site. Water and Concrete admixture meeting concrete mix design requirements will be mixed on small batches using small site Mixers, the same site mixers will be used for Cement plaster.

Where construction joints detailed on the drawing, width of concrete element warrant establishment of construction / expansion joints, or concrete placement to be stopped due to an avoidable circumstances on site, Construction joints shall be made, Concrete surfaces will be roughened cleaned to establish a good joint between old and new fresh concrete, QC inspection, Consultant approval is required before concrete placement continue in concrete member.

The design and construction of formwork shall take account of safety and of the surface finish required. The formwork will be sufficiently rigid and tight to prevent loss of grout or mortar from the fresh concrete and stand concrete Vibration (Excreted Hydrostatic Pressure) without Movements. Form work and its supports to maintain the correct position and to maintain correct shape and profile.

The formwork for foundation, beam connection, column neck and manholes etc. will be made of either traditional formwork (plywood and timber and supported by tie rod and steel support ) or DOKA system which a combination of DOKA wooden beams, plywood and DOKA steel supports system with tie rod.

Based on the issued bar bending schedule, steel cutting and bending will be carried out either in site fabrication shop / supplier steel fabrication work shop delivered to site and assembled on site as per approved IFC drawings.

Rebar will be assembled either inside or outside the concrete member, outside assembly steel will be placed by a crane to avoid any disturbance to the water proofing materials / or polyethylene plastic sheet. Additionally, when leveling concrete is provided, rebar mats can be assembled in the place.

After the concrete has hardened sufficiently, the exposed portion of anchor bolt shall be cleaned of all concrete and the threads chased. Threads shall then be carefully coated with grease and the washers and nuts installed.

All necessary laboratory tools for fresh concrete quality testing shall be available on site prior to pouring of concrete ( cube molds / cylinder mold, slump cone, thermometer etc.) and third party laboratory technician is available at site or Concrete site station ( checking temperature, slump air content and fresh concrete density and samples taken as per specifications ). Then transit mixer releases to specified concrete location.

If the air temperature is less than 30 deg C concrete shall be placed within 90 minutes of the introduction of the mixing water to the cement and aggregates, or cement to aggregates. If the air temperature is greater than 30 deg C mixing time shall be reduced and concrete placed within 60 minutes except when a suitable set retarding mixture is used and slump requirements can be met. The maximum time between batching and placing shall not exceed 120 minutes in all cases.

civil method statement for rcc columns and shear wall construction method statement hq

Below is a general method statement for illustrative purpose, there shall be different values for different parameters depending upon the type of project and climatic situations, which should be followed all the time.

Safety of the personnel and properties is to be given prime importance and all the works to be carried out without causing any accidents or property damages. Concrete works involves the following activities.

Forms and shoring in the formwork used to support the weight of concrete in beams, slabs and other structural members shall remain in place until concrete has reached a minimum of 70% of the specified 28 day strength i.e. 45 N/mm2. In absence of concrete cube results periods specified in specifications shall apply to the removal of formwork.

method statement for segment storage & stacking

The purpose of this document is to describe the procedure of operation to be followed for the storage of concrete precast segments, and ensure that all works will be conducted safely in accordance with the technical drawings, and the project specifications.

Ho Chi Minh City Urban Railway Construction Project Ben Thanh Suoi Tien section (Line 1), contract Package 2 consists of approximately 12 km long of elevated viaduct structures, erected by span-by-span Method.

In this Terms & conditions the meanings assigned to words and expressions shall be the following: - PCY means Precasting yard - Segment lifting frame or Spreader beam means the frame that is required for the lifting and transporting of the complete segment from the mould either to the finishing area or storage area. This equipment shall be designed so that there is no permanent distortion of the segment either during lifting, transport or placing on trailer prior to deliver on site. - Simple layer storage means that segments are stored side by side without stacking - Stacking means the placing of 2 segments above and inside 3 Nos 1st layer of segments which are supported on concrete support blocks.

Hazards Analysis and Risks assessment are carried out and attached in each Method Statement. This document will identify all the hazards to ensure adequate control measures and strategies are in place to mitigate as much as possible the risks.

All personnel carrying out the work will be properly trained by experienced supervision. Besides, all personnel shall wear the appropriate PPE (Personal Protective Equipment), such as safety shoes, safety helmet, reflective vest and safety harness if required.

In the event of an accident/incident, response will be carried out in the appropriate procedure, such as: - Remedial Actions, proposing actions to ensure that the Accident/Incident will be fully fixed, as required, managed by the responsible within a target date. - Preventive Actions, proposing actions to ensure that the Accident/Incident will never happen again, including for example: Toolbox Meeting (TBM) held by the Safety Officer to ensure that Site Team (Workers, Supervisors & Engineers) fully understand methods & risks.

Once the segment (maximum weight 42 Ton) is ready for lifting (refer to the method statement Segment lifting & handling works HCMC-261-CSYD-CWS-MST-00023) and all finishing works have been completed with that particular segment, it shall be transferred to the storage area.

Each segment shall be stored together with the other segments of a same span in a designated area that has been identified by the storage supervisor. The arrangements for storage of the segments shall facilitate later removal of the segments in the sequence of erection, without the need for any rearrangement in the stacking area. It shall start from the finishing area to the end of the storage area.

Two segments shall be stacked on top of 2 Nos of 1st layer segments, following the principle: - Stacked 2nd layer segments will be stored transversally - Pier segments of the span will be stored as 1st layer storage, without any segment stacked on it.

All precast segments shall be firmly supported for storage on three point bearing system under. The ground or space between the segment support blocks shall be cleared and levelled so as to prevent the segment being supported other than on the support blocks.

For 2nd layer of segment storage, the three point bearing shall be made of sand bags which the size is 500 long x 300 width x 150 high (mm). Those 3 point supports shall allow the segment to distribute its load without causing any twist to the segment carrying the load.

method statement for preparation and construction of cast in place concrete works for substructures method statement hq

The purpose of this civil work method statement is to define the procedure for the preparation and construction of Cast in Place Concrete Works for substructures in accordance with the requirements specified in the relevant specifications, procedures and drawings, considering safety and quality of the work activities.

The contractor responsible for any removal of unsuitable materials found on site and replaced with suitable materials in accordance with the project specification. Please refer to the submitted method statement for earthworks for sub-structures.

Make sure the pouring of Concrete Blinding as per approved concrete mix design and casted according to approved drawings and specifications. Curing for Blinding to be done in accordance to specifications.

The water proofing and protection board to be completed above the blinding and carried out in accordance to manufacturer recommendation and approved material submittal with method statement. Refer to approved material submittal and method statement for waterproofing materials for pile cap and tie beams.

Complete the pile head treatment carried out in accordance to the approved materials submittal and manufacturer recommendation. Please refer to approved material submittal and manufacturer recommendation for pile head treatment.

Setting out: The Surveyor to start markings and lay-out the pile cap location. Check the level, axis/grid lines, and dimensions and ensure that works are carried out in accordance to approved shop drawings.

Reinforcing Steel Bars: The contractor shall provide reinforcing steel with high grade deformed type with minimum yield strength of 460N/mm and the testing requirement for each diameter of rebars shall include tensile, bend, rebend and chemical analysis.

The Contractor and Consultant shall witness the testing to ensure that the required test are carried out as per project specs. The result will be submitted and approved by the Consultant prior to installation of the rebar.

The Contractor ensures that all rebars are passed on the required test. The Contractor shall check the shop drawings for bar bending schedule approved by the Consultant prior to start the fabrication on site.

Fixing of Steel Rebar: Fix the pile cap reinforcement and column starter bars in accordance to the approved shop drawings and project specifications. Verify the quantity, bar splices, spacing, rebar sizes and bending. Make sure that all rebar are fixed properly in the proper location. Side form spacers used in pile cap shall be concrete block spacers and sizes vary as per concrete covering of steel. Tie manually the rebars using tie wires and not allowed for any welding of the reinforcement.

Formworks materials may be reused during progress of the works provided they are completely cleaned, reconditioned and capable to withstand pressure of the newly placed concrete considering the quality of concrete finished works.

Install/erect the formworks as per approved shop drawings and project specifications. Before placing of concrete, the contractor ensures that the embedments, reinforcements, formworks are rigid and safe, and other installed materials are based on the project specs, approved shop drawings and approved by the consultant.

The contractor shall be responsible to conduct the trial mix when the design mix is approved by consultant. The contractor and consultant representatives shall be present in the trial mix to ensure that mixing is carried out in accordance with project specifications and approved design mix. The Contractor ensures that the trial mix official reports are submitted and approved prior to use the concrete on site.

Responsible parties including contractor shall check on site slump test, design mix and temperature of the concrete prior to proceeding on site works. The technicians are responsible for the preparation and providing materials cube samples with label, and testing as per project specifications.

Avoid over vibrate to prevent the concrete segregation. Maintain / provide one spare vibrators for every three vibrators used for in case of breakdown. Use ready mix concrete through-out and as per approved supplier and mixed design by the consultant.

Immediately after finishing of concrete surfaces, Curing shall commence in the form of a complete covering of polyethylene sheets. As soon as the concrete has stiffened sufficiently after not more than 24hrs, the polyethylene sheet shall be removed and the surface covered by absorptive mats of fabric and keeps continuously wet.

Removal of forms shall comply with the project specifications. Striking/Removal of forms shall be carried out carefully by contractors competent carpenters, helpers and avoid to damage the concrete surface.

After concreting works, for concrete works that is out of tolerances specified in the project specifications and for the concrete with major unacceptable quality of works, the Contractor shall responsible to repair the concrete defects immediately using the approved materials for concrete repairs.

Waterproofing works shall be started after the concrete works are completed and sufficient to receive the waterproofing materials. Refer to approved material submittal with method statement and manufacturer recommendations.

Compaction works shall be started after the waterproofing works and protection board are ready to receive the backfilling materials and approved by the Consultant. All backfilling / compaction works are carried out in accordance to project specifications.

Pouring of Concrete Blinding to be carried out as per approved concrete mix design and casted according to approved shop drawings and specifications. Curing for blinding to be completed in accordance to specifications, approved and sign-off by the Contractor and Consultant.

The third party shall ensure on site slump test, design mix and temperature of the fresh concrete prior to proceed on site works. The technicians are responsible for the preparation and providing materials cube samples with label, and testing as per project specs.

Do not deposit any concrete in the work which has partly hardened or which has been contaminated with foreign objects. Pouring of concrete in the tie beams / footings using concrete pump. Do not exceed 1.5m for vertical drop of concrete to prevent segregation of concrete.

Apply vibrators systematically, sufficient duration and intensity to compact the concrete thoroughly. Avoid over vibrate to prevent the concrete segregation. Maintain / provide one spare vibrators for every three vibrators used for in case of breakdown. Use ready mix concrete through-out and as per approved supplier and mixed design by the Consultant.

Hot Weather Concreting: Pouring of concrete shall not be allowed when the ambient air temperature exceeds 38 degrees centigrade. Take suitable precautions to ensure that the temperature of fresh concrete as placed does not exceed 32 degrees centigrade.

Transporting, placing and finishing of concrete shall be done as quickly as practicable. Elapsed time between batching and placing of concrete using OPC shall be 45 minutes unless approved by the consultant. The accepted elapsed time between batching and placing of concrete using combination of GGBS and OPC is 75 minutes.

Curing and protection of concrete tie beams / footings shall comply with the guidelines given in ACI 305R-91 and project specs. Protect and cure concrete in such a manner as to prevent the evaporation of moisture from the concrete and injury of the surface.

Immediately after finishing of concrete surfaces, Curing shall commence in the form of a complete covering of polyethylene sheets. As soon as the concrete has stiffened sufficiently after not more than 24hrs, the polyethylene sheet shall be removed and the surface covered by absorptive mats of fabric and keeps continuously wet.

method statement for construction of cast in-situ concrete water tank safe work method of statement

The purpose of this method statement is to define the procedure for the preparation and construction of Cast in Place Concrete Works for water tank in accordance with the requirements specified in the relevant specifications, procedures and drawings, considering safety and quality of the work activities.

He shall also ensure that all the equipment required to execute the works according to the construction program are available, in good condition, and provide any additional equipment that might be required.

PM is responsible to co-ordinate with the construction manager, project engineer, safety engineer, Foreman and Surveyor for a safe and proper execution of the works. To guide specific attention to all safety measures in co-ordination with the safety officer/engineer.

Steel fixer will fix the reinforcement in accordance to the drawings issued for construction. Provide concrete covering for the reinforcement based on the approved drawings. Submit the inspection request prior to fix the formworks.

Check the Plumbing Pipe Sleeves for water tank and other MEP sleeves as applicable according to the coordination drawings. The contractor should not fix the formworks without the approval from QA/QC and consultant and inspection request to be signed by both parties.

Clean the area and remove waste materials prior to fixing the formworks. Formworks shall comply with relevant specifications and standards. Submit the work inspection request after the formwork installation prior to pouring the concrete.

Provide necessary curing and removal of formworks for concrete water tank as per tender specifications and apply the waterproofing as per the applicable procedure. Clean and remove all debris prior to start the waterproofing application.

Construction of water tank wall shall be done as per the approved drawings and layout of Water Tank walls. The location of the water tank wall shall be marked out by the surveyor in accordance with the approved drawings.

The day after casting concrete for the raft slab cleaning of reinforcement and the water bar, surveyor shall mark out the wall and column alignment and the steel fixers shall fix the steel reinforcement.

When the steel is inspected and MEP clearance is received, the carpenters shall fix the side shutter in place. Shutter shall be fixed using waterproof tie rods for walls. After a final inspection of the formwork and upon receiving clearance from the Consultants the concrete shall be casted as per the approved shop drawing.

Concrete shall be deposited in uniform layers from the bottom to the required level and shall be consolidated using vibrators and pokers. Care shall be taken to avoid segregation. The maximum depth of each layer shall be restricted to 300 mm.

Once the curing period of walls is completed, The waterproofing system shall be applied to the external face of the water tank in accordance with the manufacturers recommendations and the applicators approved method statement

Once the water proofing of external face of water tank is inspected and approved by consultant the backfilling around water tank shall be carried in 250mm thick layers and its density shall be tested. The backfilling shall carry out up to the required grade level as per the drawing. During backfilling the anti termite chemical shall be sprayed after every 1 meter layer of backfilling.