How to manage temporary works in construction - Book - Page 137
Terms and definitions
designer (PD)
regulations 12 to 14.
Procedure, Protocol
A specified way to conduct an activity or a process.
Process
A set of inter-related or interacting activities that transform inputs into outputs.
Prop
A compression member used as a temporary support.
Publicly available
specification (PAS)
A standardization document that closely resembles a British Standard in structure and format, but
which has a different development model.
Rate of rise
Average placing speed of the concrete vertically up the formwork in metres per hour, taken as the
average over the pour.
Record
A document stating results achieved or providing evidence of activities performed.
Re-propping
Props installed before the falsework is removed to transfer loads to the lower slab or foundation once
falsework is dismantled.
Residual risks
Any risks which have not been designed out by the temporary works designer. The significant residual
risks are those risks that are not likely to be obvious to a competent contractor or are unusual or are
likely to be difficult to manage effectively – must be identified by the designer. The temporary works
designer must communicate the significant residual risks.
Risk
The likelihood of a hazard being realized that could cause an adverse event, together with a
measurement of its possible severity.
Robustness
The ability of a structure to withstand events such as fire, explosions, impact, or the consequences of
human error, without being damaged to extent disproportionate to the original cause.
Safe system of work
(SSOW)
A formal procedure that results from systematic examination of a task to identify all the hazards. It
defines safe methods to make sure that hazards are eliminated or risks minimized. Safe systems of
work are developed by considering the people, substances and equipment involved in carrying out a
task or activity, identifying all foreseeable hazards and assessing the risks, and then seeking to
minimize or eliminate those risks by providing a formal framework for workers to follow. In
construction, the process for producing this formal procedure normally involves a risk assessment
followed by the safe method being defined within a method statement. The key points of the safe
system of work are briefed to the operatives in the form of a toolbox talk.
Safe working
load
The maximum unfactored load that can be safely resisted by an item of proprietary equipment.
Settlement
The downward movement of the soil because of compression or compaction, or of a building, or other
structure supported by that soil.
Shear force
Load acting across a beam near its support.
Shear stress
The shear force per unit area, expressed in (say) N/mm2.
Significant risks
The significant risks are not necessarily those that involve the greatest risks but those which are not
likely to be obvious, are unusual, unexpected, or difficult to manage on this occasion.
Soffit
The underside surface of a concrete member or slab.
Soil
The mineral material that results from the weathering of rock or decay of vegetation.
Standard
A document that sets out how policy objectives are to be delivered and defines the mandatory
requirements associated with specific activities and tasks.
Standard
solution
A suitable arrangement for which the basic design work has been carried out and checked, which may
be presented in a table, for which no further calculations are required.
Strut
A member in compression.
Sub-contractor
A contractor employed by another contractor to carry out or manage construction work.
Subgrade
The upper part of the soil, natural or constructed, supports the loads transmitted by the overlying
structure of a road, runway, or similar hard surface.
Sway
Horizontal displacement of a structure in relation to the bottom, under the application of a vertical load
Sway bracing
Bracing place to counter the horizontal displacement of the top of a structure in relation to its bottom.
Temporary works
An 'engineered solution' that is used to support or protect either an existing structure or the permanent
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