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Contractors World - 2015 Vol 4 No 1

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Innovative Piling Solution for Crossrail

Innovative Piling Solution for CrossrailAlternative piles provide an innovative solution for major ground engineering work for C336 Crossrail’s Western Gateway.

Adjacent to Paddington Station, the redevelopment of Crossrail’s Western Gateway, Paddington New Yard, sees construction teams embarking on a site that is steeped with historical interest.

On the site, the team expected to uncover the foundations of Brunel’s’ engine shed and two brick turntables dating to the 1800s – findings, which in conjunction with a logistically challenging site, have led to a complex ground engineering solution being sought for the project

Bachy has been working with Costain on the project since April 2014

With the ground engineering at the Paddington New Yard site now in full swing, the complex conditions continue to result in a confined worksite

Tasked with delivering specialist ground-engineering work for the construction of a derailment wall, bus depot and batching plant, Crossrail and Costain appointed Bachy Soletanche to the intricate project to deliver a unique piling technique following an initial testing period.

Traffic to and from the historic site has been reduced as a result of the innovative ground engineering solution the Bachy Soletanche team delivered

The full ground engineering work is due to be completed by Bachy Soletanche and the Specialist Geotechnics team in April this year.

Ade Adetoro, Project Manager at Bachy Soletanche reveals the scope of the project:

Working alongside contractor, Costain, we began the work to install 162 CSP secant piles, 104 Batching Plant LDA piles, 122 Derailment LDA piles, 91 Restricted LDA piles and 97 SolThread piles in April last year. The restricted access piles included 20 full height rotary bored piles, thirty restricted access mini-piles, and our new Soiltek rig in rotary mode for the first time.
     The Soiltek rig had its mast reduced to 9.3 m to enable it to work safely under the A40 West Way, with, in places, a height restriction of 10.36 m!
      We were keen to offer a more sustainable piling solution, whilst accommodating the historic elements unearthed at the site, as a result our design team introduced an innovative technique to the project.

 

Following ten years of development ,SolThread was delivered as a sustainable alternative to conventional piles for the discrete pile caps.

Due to its threaded shape and design SolThread requires less concrete to build the piles, and also offers a reduction in the number of muck away lorries required to remove pile spoil.

The technique also offers financial and environmental savings, in addition to a reduction in site traffic and a natural improvement in safety for road users. The aim of the development of this innovative technique was the reduction of material use and lorry movements than conventional rotary piles through the creation of a threaded rotary bored pile in London Clay.

continued >>>


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