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504 EM 385-1-1 Sections 27-34
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502 EM385-1-1 Sections 14-19

27.C.09 Single post shores.

  1. Wherever single post shores are used in more than one tier, the layout must be designed and inspected by an RPE qualified in structural design.
  2. Single post shores must be vertically aligned and spliced to prevent misalignment.
Sincle post shore - osha photo.
Single post collapse accident - OSHA.
  1. When shoring is at an angle, sloping, or when the surface shored is sloping, the shoring must be designed for such loading.
  2. Adjustment of single post shores to raise formwork must not be made after concrete is in place.
  3. Fabricated single post shores and adjusting devices must not be used if heavily rusted, bent, dented, re-welded, or have broken welds or other defects; if they contain timber, they must not be used if timber is split, cut, has sections removed, is rotted, or otherwise structurally damaged.
  1. All timber and adjusting devices to be used for adjustable timber single post shores must be inspected before erection.
  2. All nails used to secure bracing or adjustable timber single post shores must be driven home and the point of the nail bent over if possible.
  3. For stability, single post shores must be horizontally braced in both the longitudinal and transverse directions.
    • (1) Single-post shores must be adequately braced in two mutually perpendicular directions at the splice level.
    • (2) Each tier must also be diagonally braced in the same two directions.
    • (3) Bracing must be installed as the shores are erected.
    • (4) Each post (near the slab perimeter) must be secured during assembly and dismantling/re-shoring to prevent the post from "fall out"".

27.C.10 Tube and coupler shoring.

  1. The material used for the couplers must be of a structural type such as drop-forged steel, malleable iron, or structural grade aluminum. Gray cast iron must not be used. No dissimilar metals must be used together.
  2. Couplers must not be used if they are deformed, broken, or have defective or missing threads on bolts, or other defects.
  3. When checking the erected shoring towers with the shoring design, the spacing between posts must not exceed that shown on the layout and all interlocking of tubular members and tightness of couplings must be checked.

27.C.11 Tubular welded-frame shoring.

  1. All locking devices on frames and braces must be in good working order, coupling pins must align the frame or panel legs, pivoted cross braces must have their center pivot in place, and all components must be in a condition similar to that of original manufacture.
  2. When checking the erected shoring frames with the shoring design, the spacing between towers and cross brace spacing must not exceed that shown in the design and all locking devices must be closed.
  3. Devices for attaching external lateral stability bracing must be fastened to the legs of the shoring frames.

Knowledge Check Choose the best answer for the question.

27-4. Adjustment of single post shores to raise formwork must NOT be made _____.

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