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Structural
Integrity - Erection
Erecting Semi-Permanent Portal Frame
Buildings
Preparation
 Wherever a large portal frame building is being erected it is sound
working practice to ensure that the work is planned effectively.
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Crew: The
correct number of experienced crew should be present |
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Safety Gear: Crew should
be equipped with, and wear, the appropriate protective clothing - in
particular hard hats and steel toe-capped boots |
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Equipment: It is essential that the
correct specification of plant & machinery is employed to minimise
risk and maximise ease of build. This is particularly applicable for
access equipment e.g. telescopic fork-lifts, scissor lifts etc. |
Briefing
All crew should be fully briefed, and confirmation of their understanding and
competence sought.
Stability of the structure
Highest Risk
The structure is at its most vulnerable when it is being erected, before its
structural integrity is achieved.
First Bay
A structure can only be safely erected if the first bay (the stable end
section) is fully stabilized before erecting the remaining bays.
This can only be achieved when the following
are fixed into position:-
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Two main-frames fully converted |
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Diagonal wall bracing |
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Roof bracing |
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Purlins securely connected on each roof
pitch |
Hazards-what can go wrong when erecting a
structure?
The main hazards giving rise to risk are:-
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Falling from a height |
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Being struck by a falling object |
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Unexpected collapse of the structure |
There are 3 recurring themes to structural
failure:-
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Accidental Human Error |
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Incorrect erection - incompetent site crew |
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Faulty or incorrectly specified structure |
Every care needs to be taken when planning and
undertaking the erection or a structure.
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