Procedural Guide - Book - Page 12
Temporary works
design check
categories
A set of four categories that relate to the level of independence for the design check.
The categories are 0, 1, 2 and 3. The higher the number, the more independent the
designer checker must be from the designer.
Temporary works
design checker (TWDC)
An independent competent person appointed to carry out a design check.
Temporary works
designer (TWD)
The designer of the specified temporary works or an identified part of it. The temporary
works designer includes any individual or engineering design consultancy who
specifies, alters a design, or specifies a particular method of work or material and who
assumes the responsibilities, as a designer, under the CDM Regulations 2015.
Temporary works lead
design checker
A competent designer, appointed when more than one design checker is involved, with
the responsibility for making sure that:
Temporary works lead
designer
the design check has considered overall structural robustness at all stages
all interfaces and interactions between designers have been adequately
covered.
A competent designer, appointed when there is more than one temporary works
designer, with the responsibility for making sure that:
the overall design is structurally robust at all stages; and
all interfaces between designers have been adequately considered.
Temporary works
manager
A senior temporary works professional (usually a qualified engineer) who oversees
the management of the design, design checking, implementation, loading,
maintenance, unloading and removal for large, complex engineering projects. Usually
manages several temporary works coordinators.
Temporary works
register (TWR)
Usually in the format of a spreadsheet, the register is used to list all temporary works
for a project and to continually monitor the progress of each item. It acts as an aidememoire to help classify, categorise, design, design check and implement temporary
works.
Temporary works
supervisor (TWS)
A competent person who is responsible to, and assists, the temporary works
coordinator.
Temporary works type
classification
The assessment of risk is classified in accordance with the implementation of the
temporary works by the temporary works coordinator and each element should be
classified as very low, low, medium or high.
Tensile force
The stretching forces on a component made up of tensile stress and tensile strain
contracting the cross-section and elongating the component.
TG20:21
National Access and Scaffolding Confederation (NASC) publication that provides
recognised, standard configurations of tube and fitting scaffolds that have been
structurally designed and for which additional bespoke design is not required.
Third party
A party, independent of a project, whose procedures have to be followed and whose
approval must be obtained, when temporary works proposals affect their assets, users
or land ownership.
Tie duty
The capacity that the connections must achieve between the tie and the permanent
structure.
Timber grade stress
and strength class
The physical and mechanical properties of timber assessed (graded) under European
Harmonised Standards (EN) criteria for bending stress, bending stiffness and density.
Top restraint
A method by which the stability of falsework is provided by surrounding permanent
works, or specifically designed temporary works.
Wind factor
A means of assessing wind exposure for temporary works, taking into account wind
velocity, topographical factors, distance from the shoreline, altitude, probability factor,
and duration of use for the temporary works.
Version 2 © mytemporaryworks 2023 | The control of temporary works – procedural guide
xii
