Project London, United Kingdom

Acton Dive Under

750mm piles installed in 4.5m of headroom

A 770m long dive-under has been constructed at Acton letting London bound trains pass underneath

Technical Specifications

Pile Type: Secant Wall

Number of Piles: 72

Diameter: 600/750mm

Depth: 12-14m

The Challenge

The works had to be undertaken within limited access constraints to complete a 750mm diameter secant wall which would later, following excavation, form a permanent retaining wall of the Acton Dive Under route.

Works required the construction of the secant wall to be carried out in 4.5m of headroom under Noel Road bridge and elsewhere in 7m of headroom under the OLE (overhead line electrification) gantries.

The Solution

Acton Dive Under is part of the Crossrail surface programme being delivered by Network Rail. 

Martello were contracted by Bam Nuttall to undertake two phases of work. The first being works under Noel Road bridge and an OLE gantry. The second one being a return visit to complete the secant wall under another OLE gantry.  All works at Acton Dive Under were taken in and around the goods yard and Great Western relief lines.

Martello's low headroom capability allowed for the construction of a secant wall in 4.5m of headroom under Noel Road bridge. 

Martello were able to complete the works in a more efficient manner, reducing costs, as the majority of the works were able to be undertaken during normal working hours and within the confines of the existing structures, saving money and reducing the overall construction programme, without compromising safety.

Project details

Project name

Acton Dive Under




Large diameter bored pile under casing, Restricted access bored piling, Secant Pile Wall


London, United Kingdom

Building Period

2013 - 2013

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