BS 5975 2019 Extract - Flipbook - Page 65
BRITISH STANDARD
c)
BS 5975:2019
For Category 2 and Category 3, the checker should carry out the check without reference to the
designer9s calculations using only the design brief, including its associated information, and the
design output.
Table 2 4 Categories of design check in temporary works
13.7.4
Category
Scope
Comment
Independence of
checker
0
Restricted to standard
solutions only, to ensure
the site conditions do not
conflict with the scope or
limitations of the chosen
standard solution. These
may include standard
trench boxes.
This applies to the use of
standard solutions and not
the original design, which
requires both structural
calculation and checking
to Category 1, 2 or 3, as
appropriate.
Because this is a site
issue, the check may be
carried out by another
member of the site or
design team.
1
For simple designs. These
may include: formwork;
falsework; needling and
propping to brickwork
openings in single storey
construction.
Such designs would be
undertaken using simple
methods of analysis and
be in accordance with
the relevant standards,
supplier9s technical
literature or other
reference publications.
The check may be carried
out by another member
of the design team.
2
On more complex or
involved designs. Designs
for excavations including
excavation support
using sheet piles, for
foundations, for structural
steelwork connections,
for reinforced concrete.
Designs where stability is
obtained by restraint at
the top of the temporary
works (e.g. top restrained
falsework).
Category 2 checks would
include designs where a
considerable degree of
interpretation of loading
or soils9 information is
required before the design
of the foundation or
excavation support or slope
is carried out.
The check should
be carried out by an
individual not involved
in the design and
not consulted by the
designer.
3
For complex or innovative
designs, which result
in complex sequences
of moving and/or
construction of either
the temporary works
or permanent works. It
also includes basement
excavations and tunnels.
These designs include
unusual designs or where
significant departures from
standards, novel methods
of analysis or considerable
exercise of engineering
judgment are involved.
The check should be
carried out by another
organization and should
include an overall check
to assure co-ordination of
the whole design.
Where different organizations, or individuals, have prepared different parts of a design, the category
of design check should be appropriate to the part of the design being checked. (See also 8.4.2 for the
role of the lead designer.)
NOTE For example if a proprietary supplier is carrying out a falsework design for their equipment, and stability
is assumed by being fixed at the head to the permanent work (i.e. top restrained), the check on the falsework would
be Category 1 but the check that the structure is able to resist the applied horizontal load might be Category 2.
© THE BRITISH STANDARDS INSTITUTION 2019 3 ALL RIGHTS RESERVED#57
