The purpose and aim of this civil works method statement is to provide and maintain effective quality control procedures and to execute the capping beam work in compliance to standard and good practice at all stages and activities in the construction of capping beam for shoring works.
This method statement applies to the construction of capping beams for shoring works in the construction of the building project.
Roles & Responsibilities
Project Manager is responsible for management of the project and all related operations.
Construction Manager is responsible for execution of this work.
Site engineer to ensure that the responsible personnel are familiar with the QCPs, method statement and safety requirements of the activity and approved risk assessment sheet is made and hazard are mitigated to ALARP level.
QC Engineer to inspect the work and ensure the compliance to the requirements/ specifications.
Site engineer to ensure that the concerned work force is familiar with the activity, hazards and mitigated effect of the situation.
Site foreman to ensure that the work crew is familiar with the safety requirements of the work activity.
Project safety officer to ensure that site staff is familiar with the health and safety requirements for this activity.
The safety of all personnel, equipment and plant operations will be the responsibility of the CM/PM in coordination with the Safety Officer.
The surveyor is responsible for setting out and level, adjustment of column before & after casting of concrete.
Necessary Tools, Materials & Equipment
- Survey Instruments
- Pneumatic Jack Hammer
- Mechanical Pile Breaker
- Concrete Mixers
- Excavator
- Tower/Mobile Crane
- Mechanical Vibrators / Internal Vibrators
- Concrete Pumps
- Transit Mixer Trucks
- All necessary Hand Tools
- Safety Equipment’s
- Reinforcing Steel
- Tying Wire
- Shuttering Materials
- Curing Water, Hessian Cloth and Polythene Sheet
- Concrete Class (C40/20)
- Binding Wire black annealed mild steel
- Polythene sheets
- Formwork spacers
- Mould release agent
Definitions and Abbreviations
MS – Method Statement
ITP – Inspection & Test Plan
ITR – Inspection & Test Request
ITL – Independent Testing Laboratory
PM – Project Manager
CM – Construction Manager
PPE – Personal Protective Equipment
QCP – Quality Control Procedure
Health and Safety Requirements
Prior to commencing any activity, the work force shall receive a Toolbox talk on the project site safety regulations by the foreman.
All the hazards and the corresponding safety precautions in the respective Risk Assessment shall be adhered to and communicated to the workers before starting work.
All the necessary PPE’s (safety shoes, helmets, hand gloves, goggles and safety belts etc.) will be worn as per risk assessment.
Local waste management guidelines will be adhered for disposing waste to designated disposal points.
All open trenches, pits shall be cordoned by means of safety cones, warning tape, warning signs and warning flashers in the night.
Experienced banksman to be assigned for machinery.
All moving equipments will be operated and maintained by properly trained operators.
Sequence of Work for Casting of Capping Beam for Shoring Piles
Setting out: Prior to the commencement of the works, confirm and establish all reference points and levels. Locate, confirm and protect control points prior to starting the site works.
Execution of Work:
After the construction of the secant piles the top portion of the secant piles shall be chipped to have a sound surface for casting the capping beam.
The capping beam shall be constructed as per approved drawing.
After casting shoring piles, breaking of shoring piles to be carried out up to -1.5m as required for capping beam and breaking to be done with pneumatic jack hammer and mechanical pile breaker fixed on excavator.
After breaking of secant piles up to required level, the smooth finish shall be maintained and loose concrete resulting due to breaking of piles shall be removed.
Lean concrete shall be poured on adjacent sides of capping beam, which will be used as base for erection of shutters and form work to have solid base.
Shuttering shall be installed as per approved drawings and secured against lateral force by concrete.
Formwork erected and installed shall be rigid, water tight and dimensionally stable.
Formworks release agent material as approved by the consultant will be applied prior casting to ensure good surface finish of concrete.
Area to be clean and expedite for rebars works.
Reinforcement of Concrete will be installed as per approved drawing and fixed properly to maintain its position during concreting.
Additional extra bars shall be installed as per approved shop drawing.
Concrete spacer shall be installed to ensure concrete cover.
To clear all MEP works related to the area to be poured / concrete and assure that all embedded MEP openings are completed prior to closing of internal shutters.
Erection of internal and external shutters to be carried out.
Co-ordinate capping beam level with external surface level following the approved drawing.
Area shall be cleaned prior to concreting; Concrete shall be poured by pump and compacted by mechanical vibrator.
Top level of concrete to be mark clearly to ensure proper level.
Vibrator should not touch with reinforcement.
Surveyor to check the alignment of capping beam starter bars before and after casting.
All necessary sampling and testing for concrete prior to start of concreting work, temperature, slump test, cube test, will be done as per specification requirement and reports will be submitted accordingly.
No bleeding showing from the shuttering to be ensured.
Masons shall work and ensure that no plastic cracks appear.
All precautions shall be carried out for hot weather concreting.
Curing Requirements
Clean water, polythene sheet and Hessian cloth to be provided for curing purpose.
Water curing will be maintained and done for minimum of 7 days or as mentioned in specifications. Concrete surface immediately after completion and finishing shall be covered with polythene sheet. As soon as concrete is stiffened sufficiently (after not more than 24 hours) polythene sheet will be removed and surface covered with absorptive fabric / hessian cloth and shall be kept continuously wet for minimum of 7 days.
Casting of Concrete
Concrete to be cast shall be of approved concrete class like C40/20 ready mix concrete approved as per specific nature of the job. At no time shall water be added to concrete after it has left the mixer, Only approved mix design to be used.
Ensure that Concrete delivery notes, Time limits, Slump and Temperature has been properly checked and verified in accordance with Project Specification requirements.
During the placement of fresh concrete, ensure that ambient temperature does not exceeds 380C.
In Hot weather condition, take suitable precautions to ensure that the temperature of fresh concrete as placed does not exceed 30 Co.
Prior to placement of fresh concrete make sure that Slump Test and cube specimen has been done.
Transporting, placing and finishing of concrete shall be done as quickly as practicable during hot weather.
Concrete Placement Procedure
The thickness of concrete placed at one time shall be the amount, which can be compacted with the available means; this thickness shall be as approved by the consultant. The concrete shall be placed as near to its final position as practicable.
The concrete in each section of structures between joints or corners shall be placed in successive pours, working away in both directions from the centermost of the section.
During concrete placement operations it will be ensured that ambient temperature is ≤ 38°C while concrete temperature ≤ 30°C.
All control and construction joints to be strictly in accordance with relevant drawings.
The vibrators shall be operated at regular intervals to produce dense, compact, homogeneous concrete surface. The size of the vibrating pokers will be decided considering the layout of reinforcements and will ensure consistent mass is obtained without segregation.
Vibrators shall be withdrawn slowly to prevent the formation of voids and shall not be placed against compacted concrete.
Where accessible, concrete shall be poured directly from the transit mixer, and for inaccessible areas concrete buckets, chutes or pumps shall be used.
The delivery ends of the chutes and pump hoses shall be kept as close as possible to the delivery points.
Maximum free fall height / free drop height shall be minimized to 1.5m to avoid segregation.
The chutes shall be placed in suitable slopes to avoid flashing and segregation.
Quality Control Procedure for Capping Beam Casting
- QA/QC Engineer is responsible for verifying all materials before incorporating to works and approved by the consultant.
- The QA/QC Engineer/Inspector will verify the items listed on Check Sheets and make physical verification that the area is ready for the activity.
- QA/QC Engineer after verifying all aspects, will forward ITR to consultant for inspection.
- In the event of any rectification required, QC Engineer will intimate the Site Engineer and get the issue rectified and a re-inspection will be done.
- After obtaining client approval the area will be released for concreting.
- The ITL will check ambient temperature, concrete temperature, slump and mix details as per delivery note & specified testing frequency as per specification and method statement for concrete sampling and testing.
- ITL will carry out the necessary testing and sampling for compression strength test as per specified testing frequency as per specification and method statement for concrete sampling and testing.
- Site Foreman after initial setting, start curing process with wet hessian and polythene sheets and water curing will be done for 14 days.
- ITL will carry out 7 days compression strength tests followed by 28 days test (In case 7 days test is a failure, the matter shall be immediately conveyed to client).
- After obtaining client approval, QA/QC Engineer will send ITR to archive for the preparation of close out dossiers.
Related Documents
- Quality Control Procedures
- Inspection & Test Plan
- Check Sheet
- Risk Assessment
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