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Shoring Works
Method Statement of the shoring work (Trench sheeting Method)
  • Trenches.
  • NDRC Pits.
  • Utilities Protection


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Prior Activities

  • A responsible Engineer & Foreman in charge of excavation works will ensure that all utilities in the area are identified. Existing services will be located with the available as-built drawings and by scanning the relevant area by Cable Avoidance Tool (CAT) or cable detectors.
  • Obtain all necessary NOC’s from the concerned authorities.
  • Obtain approval for all related documentation including the Permit to Work, the relevant Method Statement, shop drawings and design calculations if applicable.
  • Obtain approval for all related documentation including the Permit to Work, the relevant Method Statement, shop drawings and design calculations if applicable.
  • Conduct the necessary safety induction for employees.
  • Existing Services if located will be protected as per the approved norms of the Engineer / authority. Once the works are completed, the services will be reinstated back. Backfilling will proceed only after the reinstatement is approved by the Engineer / authority.
  • The Supervisor shall arrange to have these utilities protected as may be needed to do the work safely. Excavation shall be done in a manner that does not endanger the underground installations or those engaged in the work

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Setting out

The works will be set out in accordance with the agreed procedure & approval by Consultant. The setting out will be carried out by setting out from Temporary Bench Marks / survey stations established at site in concurrence with the Consultant. The setting out shall be carried out in accordance of the approved construction drawings. Please refer to surveying method statement for detailed procedure.

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Shoring and Excavation works procedures

  • Based on the required dimension, the shoring works shall be executed by stages 6.0 m / 12.0 m in length based on the excavator type and site condition.
  • Excavation should be done for all the area up to 1.20-1.50 m in depth from the ground level.
  • Setting (1) Box by the beams on the ground level and one more box at depth -1.20-1.50 m from the ground level including vertical beam at the box corners with proper welding or using steel hooks as a connection between the frames each other.
  • Once the two boxes are been welded, the trench sheets should be installed between the two frames with little tack welding with the first box and for safer, one more beam should be behind then trench sheets during the installation as a guide beam for easy installation and to prevent any movement for the sheets.
  • After installing all the sheets, the excavation should be started for 1.20 to 1.50 m extra by the excavator and manual if required with taking all the precautions during the excavation if there is any existing utilities or cables.
  • After the excavation will be ready, another steel frame should be fixed with the vertical beam/steel hooks (based on the required depth) , then remove the tack welding and pushing the trench sheets to the invert level of the 3rd frame or to little bit more.
  • Start the same procedure (Excavation, fixing a new frame and pushing the sheets) until reach to the required shoring depth.