BS 5975-1:2024 - Book - Page 54
BS 5975‑1:2024
BRITISH STANDARD
12.4 Choice of temporary works
12.4.1
A decision should be taken as to whether it is appropriate to have a bespoke design or, alternatively,
to proceed on the basis of a standard solution. When selecting a standard solution, those responsible
for making the final choice should understand and take full account of the limitations of these designs
so that they are used only in appropriate circumstances (see 12.10).
NOTE A standard solution comprises a suitable arrangement for which the basic design work has already been
carried out and presented in a tabular or other easily assimilated form, and for which no further structural
calculations are necessary. The choice of a standard solution can be influenced by such matters as availability of
material and the particular experience of the supervisory and construction workforce.
12.4.2
If a design office produces standard solutions to suit their materials or operations, such designs
should be produced in accordance with the recommendations of relevant codes and should also be
accompanied by information covering layout, loading, limitations, tolerances, lateral restraint
requirements, etc.
NOTE See 12.10 for specific recommendations.
12.4.3
Those who select a particular standard solution should be aware that they have responsibilities and
duties as a designer (see 7.1, 7.4.1 and 12.10).
12.5 Selection of materials and components
12.5.1
The properties of the materials and the components that are proposed to be used should be
identified. When designing for the use of proprietary equipment, the design should utilize the
equipment in accordance with the current recommendations of the supplier of this equipment.
Particular care should be taken to establish that the terms used to define capacity are understood;
they might be either in safe working loads or in characteristic strength. Where it is proposed to use
the equipment in situations not specifically intended by the supplier, in the first instance the supplier
should be consulted for specific advice about the proposed method of use.
NOTE 1 Where a characteristic strength (see 3.1.5) is stated, an appropriate material factor is used together with
an appropriate load factor to determine the component’s safe working load. The characteristic strength is used in
limit state design.
NOTE 2 Attention is drawn to the Health and Safety at Work, etc. Act 1974 [5], under which suppliers and
importers of equipment have a duty to supply relevant and correct performance data. Performance data issued by a
supplier of equipment can reasonably be relied on without further justification.
12.5.2
Where performance information is not readily available, or as an alternative means of obtaining the
required data, the user should assess the capability of the material, equipment or component to resist
the loading conditions using fundamental engineering principles and, where appropriate, arrange for
testing.
12.5.3
When compliance testing is required, for example, weld testing or confirmation of ground‑bearing
capacity, this should be clearly indicated with the design output and a specification for the test given.
12.5.4
Where the design relies on specific site conditions, such as ground conditions, the TWC should be
provided with guidance on the identification of the soil type and environmental conditions such as
water level.
12.6 Design output
12.6.1
Sufficient and appropriate information should be provided by the TWD to allow the temporary works
scheme to be checked and implemented correctly.
NOTE This might include drawings, equipment user guides, erection tolerances, outline method statements and
residual risks.
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