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Cordek meets Crossrail challenge

Construction of a 28m diameter, 43m deep cast insitu shaft at the Lower Lea Crossing for Crossrail will prove no obstruction to the passing of the tunnel boring machines (TBMs) thanks to void formers developed for the scheme by Cordek.

Four 8m diameter irregularly profiled Filcor 100 expanded polystyrene void formers from the company have been cast into the shaft (pictured left) to allow the TBMs to arrive and exit the shaft without damage to the cutter heads.

Cordek’s Filcor range is available in a wide variety of densities, which can accommodate large heads of concrete without significant compression.

The void formers supplied to Crossrail were manufactured with precisely aligned channels to accommodate a restraining system to ensure they remained in position during the casting process.

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