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Posted By Ian Aspinall
As a company, we sub-contract our scaffold out to various companies. On my inspections, I have noticed that with certain modular scaffolding (the steel wedge and pin type-not aluminium towers), there are normal putlug poles clipped on and used as rakers to support the scaffold. Is this normal practice to mix two types of scaffold or is there a norm for this type?
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Posted By peter gotch 1
Hi Ian
I think you are referring to Kwikstage.
From the first development of steel system scaffolds, they were designed to be compatible with tube and fitting not least to allow tying to buildings and dealing with features of a structure that did not suit a system that assumes standard dimensions and everything rectangular, e.g. oriel windows where it is necessary to use tube and fittings to fill in the gaps.
NOT compatible with aluminium as there can be an electocatalytic reaction, resulting in thinning of components. [There's guidance on this somewhere on the HSE website]
Regards, Peter
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Posted By Des Daly
Ian,
Mixing loose tube and fitting type scaffolding with modular system type is not a problem, however, from what you say the system scaffold is being stabilised by rakers - a problem I can see here is that the frequency of ties increases for modular scaffolds. So I would ask your scaffolding contractor to prove to you that their scaffolds are secure and safe e.g. designed to BS EN 12811 / BS 5973.
Des
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Posted By Robert K Lewis
Des
Strictly it is 12811 that applies to these modular scaffolds. BS5973 is replaced by the current TG20 guidance from the NASC.
In view of the use of rakers there should be a design made for the scaffold as these are not standard items pre-designed under either the BS or the guidance.
Bob
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