BS 5975 2019 Extract - Flipbook - Page 70
BS 5975:2019
BRITISH STANDARD
14.2.2.3
The sequence and order of removing temporary works supports can be critical to avoid damage to
the permanent works under construction. Generally the supports to spanning members should be
removed starting mid-span, and for cantilever sections, should be removed starting at the tip. The
PC9s TWC, or TWC where appointed, should refer to the permanent works and/or temporary works
designer if in any doubt about the sequence.
14.2.2.4
The sequence and level of props removed during backpropping operations (see 19.3.4) is particularly
important to avoid overloading of the completed slabs. The sequence should be agreed by the PC's
TWC or the TWC with the permanent works designer and be included in the implementation plan
(see also 14.1).
14.3
Dismantling
When the structure being supported by the temporary works has become self-supporting, or the
excavation has been backfilled or other condition, the temporary works should be dismantled
(removed) in accordance with any restrictions imposed by the permanent works designer as set out
in the implementation plan. As at the loading stage, a permit to dismantle the temporary works might
be appropriate, particularly where this takes place in stages. Care should be taken to ensure that the
temporary works remains stable during all stages of the dismantling process.
62#© THE BRITISH STANDARDS INSTITUTION 2019 3 ALL RIGHTS RESERVED
