5 Miles Street

Student Accommodation

An innovative piled raft foundation solution by Walsh, enabled the superstructure of this 32 story tower to commence on programme, and earned the project a shortlisting for a 2017 Ground Engineering Award.

The substructure design of this project has seen Walsh overcome a number of challenges including a very small site, sensitive settlement requirements and a tight construction programme.

The combination of a restricted site next to a Network Rail viaduct and several existing buildings, plus a tight deadline to commence work meant that it was not possible to undertake a pile load test. Without such a test the contractor could only achieve the loads by using 1200mm piles, but the rig would have been too big for the site. Working with geotechnical consultants CGL, Walsh devised a piled raft solution utilising the high level ground to limit deflections.

Elsewhere, as well as Walsh designing the core to be slip formed, the underground drainage was placed on top of the raft, due to the tight boundary site and water attenuation pipes were used instead of the typical attenuation tanks. In addition, working with frame contractor GetJar, concrete slabs were designed with mesh reinforcement.

Urbanest facade image for walsh structural engineers
Basement showcasing reinforced concrete and piling wall

Key Facts

  • Client: Urbanest
  • Location: Vauxhall, London
  • Year: 2018
  • Summary:
    A 454 bed student accommodation block in Vauxhall, London. The 33-storey building will include a wealth of personal and communal study areas, lounges and a cycle store, together with significant enhancements to the public realm.

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