BS 5975 2019 Extract - Flipbook - Page 66
BS 5975:2019
13.7.5
BRITISH STANDARD
On completion of the design and design check, a certificate should be issued for Category 2 and
Category 3 checks and, depending on the organization's procedures, might also be required for
a Category 1 check. The certificate should confirm that the design conforms to the requirements
of the design brief, state the standards/technical literature used and list the constraints or
loading conditions imposed. The certificate should state the category of check and identify the
drawings/sketches, specification and any methodology that are part of the design and it should be
signed by the designer and design checker. The package of information issued to the TWC should
include this certificate.
NOTE 1 Neither the designer's nor the design checker's calculations form part of the design compliance items listed
on the signed design certificate.
NOTE 2 Table 2 can be developed by each organization's procedures to suit their particular range and scope of
work and the examples given under scope are indicative.
NOTE 3 Where a standard solution (Category 0) is used, a certificate is issued when the solution is originally
developed (see 13.7.1).
13.8
Resolution of queries raised by the design checker
13.8.1
In all categories of check the design checker should withhold signature of the design check certificate
until they are completely satisfied that the design output contains all necessary information to allow
the temporary works to be constructed without the site team having to develop it further. In addition
the design checker should be satisfied that the design output is in accordance with the requirements
of the design brief and has been produced in accordance with recognized engineering principles,
relevant British Standards and other appropriate specialist guidance.
13.8.2
The design checker should identify 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. The design checker should identify also any area where further or additional detail
is required.
13.8.3
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. For Category 2 and Category 3 design
checks a more formal process should be adopted.
13.8.4
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 PC9s 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.
13.8.5
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
(design statement) prepared by the designer and agreed by the client9s 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 (design statement). The design statement should form the basis for the design
and checking and should assist in the resolution of queries.
NOTE
13.8.6
This procedure is generally in accordance with the requirements of Highways England9s BD2 [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
ensure it is issued to the design checker. The design checker should review the schedule and annotate
58#© THE BRITISH STANDARDS INSTITUTION 2019 3 ALL RIGHTS RESERVED
