How to manage temporary works in construction - Book - Page 138
Terms and definitions
works during construction, or to support an item of plant or equipment, or the vertical sides or sideslopes of an excavation during construction operations on site or to provide access.
Temporary works
Coordinator (TWC)
A competent person with responsibility for the co-ordination of all activities related to the temporary
works.
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 work 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
138
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 aide-memoire to help classify, categorize,
design, design check and implement temporary works.
Temporary works
supervisor (TWS)
A competent person who is responsible for, and assists, the temporary works coordinator.
Tensile force
The stretching forces on a component made up of tensile stress and tensile strain contracting the crosssection and elongating the component.
TG20
National Access and Scaffolding Confederation (NASC) publication that provides recognized 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 must be followed and whose approval must be
obtained, when temporary works proposals affect their assets, users, or land ownership.
Tie duty
The capacity that connections must achieve between ties and the permanent structure.
Timber grade
stress and
strength class
The physical and mechanical properties of timber assessed (graded) under European Harmonized
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, considering wind velocity, topographical
factors, distance from the shoreline, altitude, probability factor, and duration of use for the temporary
works.
Works records
All relevant documents that relate to the design, design checking, residual risks, inspection, testing,
permitting, erection, safe use, maintenance, dismantling of all items of significant temporary works.
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