Project London, United Kingdom

Gospel Oak to Barking

Upgrade of existing bridge foundations between Gospel Oak to Barking as part of the Network Rail maintenance framework

As part of the Network Rail maintenance framework, Martello were required to install large diameter piles into the difficult East London ground conditions.

Technical Specifications

Pile Type: Bored piling under bentonite drilling fluid

Number of Piles: 67no.         

Diameter: 900mm   

Depth: 22m

The Challenge

Large diameter piles were required as part of a Network Rail maintenance framework to upgrade existing bridge foundations between Gospel Oak to Barking.

Headroom restrictions limited the size of the piling equipment  which could be used for the project, and the Lambeth Group ground conditions prohibited the use of dry open-hole techniques, or the use of CFA, owing to high pile bending moments requiring significant reinforcement inclusion in low headroom conditions. 

The Solution

Martello proposed a 900mm diameter piling solution in lieu of the original 600mm diameter piles, leading to savings of 60% in pile numbers, a significant reduction in pile reinforcement congestion and an enhanced bending capacity to take the train braking loads. 

Martello developed the MP4003 piling rig with a zero tail-swing counter weight for the restricted conditions to be encountered on this project. Pile reinforcement cafes were fabricated form bars of 40mm and 32mm diameter installed in short lengths below the bridges and coupled together.
The piles were bored under bentonite drilling fluid, to support unstable ground and enable the ease of placing the reinforcement, even in low headroom conditions.  

Project details

Project name

Gospel Oak to Barking

Category

Bridges

Techniques

Large diameter bored pile under casing, Restricted access bored piling, Large diameter bored pile under support fluid

Contract type

Build

Location

London, United Kingdom

Building Period

2013 - 2013

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