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Bow Street Hotel
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Technical Specifications
Pile Type: Bearing/Contiguous Wall/Secant Wall
Number of Piles: 350no.
Diameter: 450/600mm
Depth: Up to 23.3m
The Challenge
Renowned for being one of England's most famous courts due to its history of high-profile cases, the Bow Street Magistrates is now being transformed nito a £125m luxury hotel and museum. The courtyard that once saw the Cray Twins will be redeveloped into a 91 guest room hotel, a restaurant-bar, fitness studio and original courtroom restaurant.
Access to site was via a 3.8m high entrance which was just enough room to mobilise the MP5000 series piling rig and install piles between the existing propping.
The Solution
Over two phases, Martello installed 8no. 600mm diameter crane base piles to over 23m, and 8no. temporary piles used as a foundations for the propping system that forms the facade retention site. The temporary and crane piles were constructed from within the exisiting building, enabling works were then completed by the client in preparation for Martello to return and install the 334no. 450mm and 600mm diameter secant wall piles. A Klemm 702 was mobilised to site to install the 450mm diameter section of wall in a restricted part of site, this rig cored through redundant foundations to complete these tricky piles.
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Experience
Martello's experience of coring through obstructed positions and working on a number of Grade II listed buildings and basements supported them in the delivery of this project. The compact nature of the Klemm 709 piling rig allowed for it to be easily mobilised into site through 3.8m of headroom, and enabled the installation of the 600mm secant wall around and between the propping system without the need for changes to the site layout.
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