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CTRL crib wall completed

GEOTECHNICAL CONTRACTOR Phi Group has just completed the design, supply and construction of a timber crib wall for the Scalers Hill section of Contract 330 on the Channel Tunnel Rail Link in Kent.

The wall was built for the Alfred McAlpine/Amec joint venture using Phi Group's British Board of Agrement approved Permacrib retaining wall system.

The 432m 2wall retains a 200m long, 2. 5m high section of embankment. Work also involved placing and compacting 3800m 3of fill and landscaping, which required 1500m 3of topsoil and 2000 Permabag planting bags within the wall.

Railway structures are designed to reduce or eliminate the risk of steel components causing stray currents, leading to a loss of power efficiency of drive units.

Using inert timber crib wall structures filled with natural stone and landscaped with natural vegetation can help reduce the chances of this occurring, says Phi Group's Gerry O'Brien.

Permacrib is manufactured from sustainable forest resources and is treated for long life.

O'Brien says the system, which has been widely adopted by the UK geotechnical industry, embraces the ideas of sustainable construction and is environmentally friendly.

He adds that ongoing BBA approval and certification means that the system can be specified by clients with confidence. The firm has now been awarded further work on the Repton Ponds section of the highspeed rail contract.

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