BS 5975-1:2024 - Book - Page 50
BS 5975‑1:2024
11.2.3
BRITISH STANDARD
The role of the TWS is to provide on‑site support to the PC’s TWC or TWC for the control of temporary
works; as such the TWS should not be responsible for any design or design checking of temporary
works but should be responsible for the implementation of the PC’s or contractor’s procedure for the
control of temporary works.
NOTE This exclusion also covers the determination of specific loads, assessment of load paths, engineering checks
of any kind, determination of foundation capacity, etc.
11.2.4
The appointment of a person as TWS should not preclude them from carrying out design or design
checking if they are considered competent (see 4.2.1, 7.4.1 and Table 2).
NOTE The organization's DI can appoint the same individual to carry out specific design and/or design checking
but this would be under a separate specific nomination relating to design.
11.3 Duties of the TWS
Where appointed, the main activities of the TWS should be to:
a)
liaise and cooperate with the PC’s TWC or TWC where appropriate;
b)
assist the appropriate TWC in confirming that the site is operating in accordance with the
approved procedures;
c)
check that information relevant to the temporary works has been received prior to
commencement of work on site, including any residual risk information from the TWD;
d)
supervise the erection, use, maintenance and dismantling of the temporary works as applicable;
e)
carry out or supervise the required checks at appropriate stages during the construction
erection or installation of the temporary works;
f)
carry out or supervise any planned maintenance of the temporary works;
g)
draw to the attention of the PC’s TWC and/or TWC and/or the designer (as appropriate) any
changes or modifications to the scheme, differences of environment or changes in use;
h)
carry out the final check prior to use of the temporary works;
i)
in the event that any inspections reveal discrepancies between the certified and as‑constructed
temporary works, issue a notice to prevent loading (or unloading) until the discrepancies have
been rectified to the satisfaction of the PC’s TWC and/or TWC;
j)
after a satisfactory final check, and when authorized to do so, issue a permit to load or proceed
(bring into use) and copy that permit to the PC’s TWC and/or TWC (see 13.2.1); and
k)
when it has been confirmed that the permanent structure has attained adequate strength and/or
stability, and when authorized to do so, issue a permit to unload (take out of use) the temporary
works and provide a copy of the permit to the PC’s TWC and/or TWC (see 13.2.2).
NOTE The TWS is normally restricted to issuing permits for temporary works of low implementation risk, as
defined in their organization’s procedure.
12 Process for the design of temporary works
12.1 General
12.1.1
The design of temporary works should be undertaken with reasonable professional skill and care.
12.1.2
The permanent works designer should first assess the risks involved in the buildability of the
structure. Their overall design should be take account of the methods of construction and the space
required for any temporary works. The permanent works designer should provide the relevant
information, particularly the significant residual risks involved in its construction. The temporary
works designer should take this information into account in the preparation of the design.
42 © THE BRITISH STANDARDS INSTITUTION 2024 – ALL RIGHTS RESERVED
