ABSTRACT
For alteration work, particularly when forming a new opening in a wall, both dead shoring and raking shoring may be necessary. Caution must be observed, a careful survey should be made to ascertain the condition of the structure, and the work supervised by an experienced person. A sketch showing the combined use of ther various shores is given in Fig 1
FIG 1
Sequence of operations:- The window openings should be securely strutted as shown in as a precaution against any deformation taking place. If conditions warrant the use of raking shores, they are secured in position as described in . The procedure is then as follows:- holes are cut through the wall and the needles inserted. These may be of timber or steel sections, and must be above the level of the new lintel or beam to the opening. A clearance should be left between the top of the needle and the wall which it is to support, so that a bed of cement mortar can be rammed in to provide full area contact between the needle and the wall. Where a wall is heavily loaded it may be necessary to insert padstones between the needle and the wall to distribute the weight. Fig 2. These padstones should be wider than the needle. The sole plate should be firmly bedded in position and the dead shores tightened into place. Dead shores may be of timber, or adjustable steel props may be used. Heavy duty adjustable steel support trestles capable of a safe working load of 20 tonnes are available.
