The complexities of working within the historic centre of London, close to the Tower of London, make the design of even a small extension complicated. However, good progress is being made and the specially designed substructure has been installed, successfully avoiding numerous shallow critical services.

The extension shown within these images is required to house generator attenuation, and so although the weight is not significant, the extension structure required support to be provided directly above numerous shallow services. Consideration was also given to the floor structure needing to be suitable for supporting the weight of heavy generators traversing it during installation and future removal.

The services were located directly beneath the line of  walls and columns, and so cantilever substructure, supported by piles, was required. In addition to the offset structure, the available depth for the substructure to pass over the services, whilst still being concealed below ground level, was extremely restricted. Our design included bespoke fabricated steelwork that neatly passed over the shallow services whilst acheiving the required structural strength and deflection limits.

The superstructure steelwork is more typical, but is connected to the substructure steelwork in a manner that allows them to work together and make the structure perform more efficiently. 

The scheme is certainly not the largest, but it still required a great deal of thought and skillful design to acheive the project requirements.

Should you have a particularly intricate or complex project we would be delighted to hear from you to see how we might be able to assist!

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Article Author
R Ponter
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