Method Statement for Casting Columns and Sheer walls

Definitions and abbreviations

PM:                 Project Manager

CM:                 Construction Manager

PE:                  Project Engineer

QCE:               Quality Control Engineer

SE:                  Site Engineer

QA QC:          Quality Assurance and Quality Control

PPE:                Personal Protective Equipment

HSE:               Health, Safety, and  Environment

ITR:                Inspection Test Report

ITP:                 Inspection Test Plan

Contents

  1. Scope of Work
  2. Personnel Responsibilities
  3. Safety Arrangements
  4. Training
  5. Project Specific Details

Scope of Works.

The purpose of this Method of Statement for the reinforced concrete columns, walls, and vertical elements cast on site is to outline the materials and labor required to undertake the works in a safe and controlled manner, compiling with relevant legislation, standards, codes of practice, etc.

Method Statement for Casting Columns and Sheer walls

The method statement shall be briefed to all appropriate operatives to ensure that they are aware of the sequence of activities and any Client/Consultant project-specific requirements.

Constant monitoring and supervision duty shall be undertaken by the main contractor to ensure work activities are carried out in accordance with the method statement. Any irregularities shall be immediate action.

This method statement describes the working procedures for the reinforced concrete column, wall, and vertical elements cast on site and all related activities. This will include surface preparation, application, testing, and post-application.

Reference.

  • Approved drawings for construction.
  • Project specification Section.
  • Approved Design Mix for Concrete.
  • Approve project quality & safety plan.
  • Approved Inspection of preliminary work (blinding concrete, waterproofing works if required).

Preparation.

  • Surveyor will set out the area to which the form works will be placed based on approved drawings for the relevant pour.
  • A suitable platform will be installed next to the reinforced concrete retaining wall for ease of erection of the formwork, rebar installation, and subsequent concrete works.
  • Platforms should have suitable access and other safety implements, i.e., guard rails, toe boards, knee boards, etc., to ensure safe system work.
  • Prior to splicing vertical bars, ensure that the construction joint (where they occur) is free from laitance and prepared to provide mechanical bonding.
  • Ensure that the starter bars have adequate splice length and have not deteriorated.

Reinforcement.

  • Rebar will be installed by a combination of manual handling and lifting equipment, held together by binding wires, and based on the approved drawing taking cognizance of splice length, structural opening, cast-in items, concrete covers, etc.
  • Wall mats may be fabricated on-site or may be tied on the site.
  • Check the latest drawing and schedules are available on site and workplace.
  • Ensure that the reinforcement is installed in accordance with the approved design and bar bending schedule.
  • Where required, MEP embedded services will be fixed in the required level and location as per approved MEP drawings.
  • All embedded items (for succeeding activities) shall be fixed properly.
  • Cleaning of the area shall be done regularly by an air compressor and hand tools prior to formwork closure.
  • The Site Engineer shall ensure that MEP clearance has been received and signed by MEP Engineers.

Form-works

  • Ensure that all types of formwork to be utilized including releasing agents had obtained by approval from the Engineer / Consultant before proceeding.
    Handle and store materials separately in such a manner as to prevent intrusion of foreign matter or deterioration.
  • Formwork materials shall be new. Materials may be reused during the progress of work, provided they are completely cleaned, reconditioned, re-coated for each reuse, and capable of producing formwork of required quality.
  • Form-works shall conform to the shape, lines, grade, and dimension of concrete as required by the drawings and shall be constructed in accordance with approved proposals.
  • Ensure that the approved shutter release agent material is used on the shutter’s internal sides.
  • Ensure that all MEP-embedded items and other items for any succeeding activities are correctly fixed.
  • Ensure MEP clearance has been approved.
  • Ensure the shutter’s true plumb and alignment. Check the approved shop drawing layout for accuracy.
  • Ensure that there is a safe and clean platform for access prior to concrete casting commencement.
  • Ensure that all shutter designer recommendations (concerning casting rate and methodology etc.) shall be followed.
  • Ensure that the shutter is as per the approved drawing.

No concrete shall be placed in forms until form-works, reinforcement, embedment, and all other aspects of the works performed herein have been examined and certified by the Engineer / Consultant.

Placing Concrete.

  • Ensure a “concrete pouring permit/inspection request & clearance” has been signed off by all parties involved.
  • Sufficient lighting will be provided during the night casting process.
  • The required number of concrete test cubes shall be taken. These shall be individually marked and passed to the checkpoint.
  • Concrete trucks will be checked by the QA/QC representative prior to delivery of concrete to ensure the mix is as per the approved design mix.
  • Concrete slump tests and temperature shall be checked randomly or at the discretion of the Engineer / Consultant.
  • All surplus waste concrete shall be cleared away.
  • Pouring concrete will be carried out using a crane with concrete buckets or mobile pumps.
  • The concrete shall be vibrated. Spare vibrators shall be kept in case of emergency.
  • Fresh concrete shall not be permitted to fall from a height of greater than 1.50 meters without the use of adjustable-length pipes or elephant trunks.
  • Ensure a continuous supply of concrete by proper coordination during casting to avoid any technical complications like cold joints, bleeding, and segregation.
  • The curing process will continue for 7 days. The concrete surface will be wetted during this period otherwise with the use of a curing compound.
  • Concrete cubes will be sent to the third-party testing authority for testing at 7 & 28 days and for durability tests.

In the case of cold joints during the pouring of concrete, the use of an approved bonding agent between old and fresh concrete may be applied with the approval of the Engineer.

Concrete Sampling & Testing.

  • The slump of concrete will be done randomly or at the discretion of the Engineer.
  • Cubes will be taken as per Project Specification Sec. 033000 Cast in Place Concrete.
  • For every 25 m3 delivered 1 set of 4 cubes is to be taken for compressive strength test, 1 cube for 7 days, 2 cubes for 28 days, and 1 cube spare.
  • Testing cubes will be done and approved third-party laboratory
  • The slump and temperature of arriving concrete and cubes will be taken by the supplier technician.
  • The cubes will be kept in containers protected from direct atmosphere and in accordance with British Standards.
  • Concrete poured record to be submitted to Engineer daily.

Dismantling.

  • Removal and striking of formworks shall be carried out after 24 hours of casting and shall be performed carefully under competent direction to ensure that the concrete surface will not be damaged.
  • All safety precautions shall be maintained during the shutter dismantling process.

Personnel Responsibilities.

For the works as covered by this method statement, the following personnel has specific duties.

Technical Officer Engineer

  • Responsible for ensuring that the various submitting are timely undertaken (materials, method statements, workshop drawings, subcontractor’s issues, technical issues).
  • Responsible for quotations as required (materials, subcontractors).
  • Responsible for ensuring RFI’s (requests for information) is a timely undertaken on behalf of the contractor.
  • Responsible for the distribution of documents to contractor site personnel.

Site Engineer(s).

  • Ensuring that the project is managed in a safe manner and meets the requirements of the project documentation.
  • Ensuring that subcontractors and suppliers achieve the on-site required standards.
  • Ensuring the Client is satisfied with our performance.
  • Ensuring performance measurable are delivered.
  • Shall refer to the QA/QC Department and the HSE Department for advice and guidance when required
  • Shall ensure that operatives comply with the relevant method statements, Toolbox Talks, and general site briefings.

Health and Safety Site Representative(s).

  • Assisting in the production of any health, safety, and environmental documents.
  • Monitoring the implementation of health, safety, and environmental requirements
  • Undertaking audits and ensuring that corrective and preventive actions are taken where required.
  • Liaison with the senior site staff on health, safety, and environmental-related matters.

QA/QC Site Representative(s).

  • Preparation of the ITP (Inspection, test & plan).
  • Ensuring that all required tests are performed and follow appropriate specifications etc.
  • Reviewing and ensuring that all shop drawings and material submitting are presented to the appropriate bodies with adequate supporting information.
  • Ensuring that materials are inspected when delivered to ensure they comply with the various specifications.
  • Maintaining a record of all QA/QC activities on site.
  • Controlling and ensuring all measuring and test equipment on site is properly calibrated.
  • Controlling all non-conforming products or workmanship and implementing the required preventive actions.
  • Ensuring that corrective and preventive actions are taken when required.
  • Ensuring that the required testing is undertaken by approved independent laboratories and that all test results are reviewed.
  • Undertake audits to ensure conformance to agreed Standards, Legislation, and project-specific requirements.
  • Ensuring that staffs are aware of their responsibilities in respect of quality issues.
  • Assisting and reporting to the QA/QC Manager as required.

Supervisor(s)

  • Ensure that all operatives and appropriate subcontractors have been briefed as to the content of the method statement and the works.
  • To adequately control the works as required.
  • To ensure the works are undertaken in a safe manner.
  • Ensure all operatives are adequately trained in their respective works.
  • Reporting any unsafe practices on-site to the contractor site team.

Subcontractors

  • To undertake their works as specified.
  • To work in a safe manner.
  • Ensure all operatives are adequately trained in their respective works.
  • Report any unsafe practices on-site to the contractor site team.

Safety Arrangements.

The contractor’s Project Safety Plan shall be strictly enforced. All works shall be regularly monitored to ensure full compliance.

The contractor shall resource as appropriate the supervision of the works.

Permits – Where required, permits to work will be provided prior to the commencement of works. Permits shall be issued by suitably trained and experienced HSE personnel only.

PPE – All required PPE shall be issued. Constant monitoring and supervision of the works shall always ensure that the appropriate PPE is worn by affected operatives.

Access and egress – Routine access and egress will always be provided for materials and operatives. Where emergency routes are required. These shall be determined and arranged, and instructions are given prior to the commencement of the works.

Contractor supervision shall ensure that all material deliveries are coordinated, and all vehicles are parked in a position where they present no additional risk to the public or people associated with this project. Where vehicles are offloaded from public areas, the activity shall be supervised, and a dedicated offloading/storage area shall be provided.

Plant – All plants associated with this activity shall be inspected prior to the works commencing and at regular periods during the works to ensure that all required certification is current and that the plant is maintained in a safe and suitably working manner.

Lighting – At all times, appropriate and suitable lighting shall be provided to ensure the works can be undertaken in a safe and competent manner.

Working at height – Where required, all appropriate measures shall be enforced to ensure that operatives are afforded a safe and proper platform from which to work. Materials will be stacked in a safe and secure manner.

Scaffolds shall be erected by competent operatives to an agreed design. Scaffolds shall be inspected before use and at regular periods thereafter.

Housekeeping – At all times, contractor supervision shall monitor the works to reduce as far as reasonably practical the storage of rubbish, waste materials, and debris at the work face. All waste materials shall be removed from the workplace to a suitable area.

Training.

The contractor shall identify the needs for training and/or certification of personnel to ensure that suitable levels of proficiency are attained and maintained to meet the specified requirements of the project.

Contractor shall:

  • Determine the necessary competence for personnel performing work affecting its quality.
  • Provide training or take other actions to satisfy those needs.
  • Evaluate the effectiveness of the action taken.
  • Ensure that its personnel is aware of the relevance and importance of their activities and how they contribute to the achievement of the product.
  • All records shall be maintained.

Prior to these works commencing, a review of the activities shall be undertaken in association with the operatives undertaking the duties. This will identify where additional training over, and above existing knowledge or experience is required.

This Method Statement shall be communicated to appropriate personnel connected with the undertaking of these works. This is essential to the safe and successful completion of the operation. The method statement shall be signed every time the operatives are briefed.

Plant and equipment required for these works:

  • Transit Mixer
  • Concrete Pump / Concrete Bucket
  • Concrete vibrator
  • Hand tools, brush, and measuring tapes
  • Wooden float
  • Shovel

Note: All machinery needs to be third-party certified, and will be daily checked, maintained, and refuel. Operators must be licensed and well-trained. Both machines and operators will be constantly checked by a competent person during operation. The demonstration will be conducted as per the requirement of the Engineer.

Also read: Method statement for blockwork

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