BS 5975-1:2024 - Book - Page 57
BRITISH STANDARD
BS 5975‑1:2024
12.8 Resolution of queries raised by the design checker
12.8.1
12.8.2
In all categories of check, the design checker should only sign the design check certificate when they
are completely satisfied that:
a)
the design output contains all necessary information to allow the temporary works to be
constructed without the site team having to develop it further; and
b)
the design output is in accordance with the requirements of the design brief and is in accordance
with recognized engineering principles, relevant British Standards and other appropriate
specialist guidance.
The design checker should identify:
a)
areas in the design output where their calculations indicate an element (including connections)
might be overstressed or exceed the allowable load in a proprietary member; and
b)
any area where further or additional detail is required.
12.8.3
For Category 0 or Category 1 design checks, queries should be raised directly with the designer and
resolved before the design output is issued as a certified design.
12.8.4
For a Category 2 design check, a schedule of queries should be prepared and issued directly to the
designer with a copy of the query schedule issued to the TWC and copied to the PC’s TWC as
appropriate. The schedule should not contain references to calculations, but could indicate levels of
stress in members or forces or ground pressures. The designer should respond to the queries and
provide additional and/or revised details where necessary.
12.8.5
For Category 3 designs and design checks, the design parameters (loads, idealized structures, soil
parameters and design standards/guidance) should be identified in an AIP or similar document
(e.g. design statement) prepared by the designer and agreed by the client’s technical advisor before
commencement of the design. In the event that the client does not appoint a technical advisor, the PD
should agree the AIP. The design statement should form the basis for the design and checking and be
used in the resolution of queries.
NOTE This is generally in accordance with the requirements of National Highways CG 300 [6].
12.8.6
For a Category 3 design check, a schedule of queries should be prepared and copied to the PC’s TWC,
via the TWC as appropriate. It should then be issued to the designer. The schedule should not contain
references to calculations, but could indicate levels of stress in members or forces or ground
pressures. The designer should respond to the queries, revising the design output where appropriate,
and copy the schedule with the responses to the PC’s TWC or TWC, as appropriate, and verify that it is
issued to the design checker. The design checker should review the schedule and annotate it to accept
or reject the designer's response. When there is an impasse over particular queries, the PC’s TWC,
after consultation with the client, should confirm whether the designer and design checker are to
discuss the outstanding query(ies) and how these discussions are to be recorded. The design checker
should confirm all queries have been resolved and the designer should issue the revised design
output in order that the design and design check certificate can be signed by the design checker.
12.9 Alterations
12.9.1
Changes in the requirements of the design brief should be recorded in writing, with reference to the
original design brief, and issued to the designer. The designer should check the proposals against the
certified design and incorporate the requirement for these alterations into the design and drawings.
If there is no significant change to the design, the designer should confirm the acceptability of the
proposals to the appropriate TWC.
© THE BRITISH STANDARDS INSTITUTION 2024 – ALL RIGHTS RESERVED 49
