Temporary Works

51 Granville Road, Maidstone, UK

This temporary works project in Maidstone, Kent, involved the construction of a reinforced concrete basement that required propping.

The construction sequence on site was such that the temporary propping had to be designed for several load case scenarios. Our remit was the structural design of temporary propping for the basement walls, as well as the design for both the temporary piling platforms and the reinforced concrete slabs for the silo tanks used in the project.

Located by a highway, the site required AIP approval before works could commence. The deadlines for approval were critical: if the dates were missed, the construction programme would be greatly and adversely affected.

The contractor working on the project had a preferred method of propping, which they wanted to use to aid their construction sequence on site.

After a number of initial design meetings with the construction team and the permanent works engineers, the position of the raking props was agreed in principle.

An initial review of scheme options pointed to a traditional structural steel solution as the best choice for the temporary works, mainly because of the level of forces required to support the surcharge loading of a 20-ton piling rig that would be in operation during the construction phase.

However, discussions with the concrete formwork company undertaking the works on site highlighted a different system as potentially suitable. The works team’s preference was for a propriety system that could be constructed quickly, aiding the construction programme.

We contacted RMD to discuss their Megashore System, which could support the waler loads from the 20-ton piling rig, and it was agreed that the system would be the most efficient.

The raking props were spaced so they could be supported by the new pile caps but the new 200mm slab was not able to support the vertical loads. By using a waler along the slab to support the raking props, however, any effect on the 200mm concrete slab was negated.

By adopting a new system – one that the contractor, subcontractor and the LSY team had not used before – the project was completed in just one week, and the AIP deadline was met comfortably.
We were able to broaden our knowledge in the process and have since adopted this system on other projects, based on the success of Granville Road.

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