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Tubular props keep watch in Geneva

CONSTRUCTION OF watch manufacturer Rolet's new factory in Geneva, Switzerland is under way with a little help from Bauer Spezialtiefbau and its joint venture partner Perrin.

The etcavation for the factory is 18m deep and measures 88m by 85m. It is supported by an insitu concrete diaphragm wall installed with a diaphragm walling grab to a depth of up to 28m.

Due to the difficult ground conditions comprising stiff to medium firm marine clays, it was impossible to tie back the vertical wall with anchors, so Bauer proposed an alternative system of internal tubular props.

Other works carried out by the joint venture include construction of 10,000m 2of 1.2m thick grabbed insitu concrete diaphragm wall and a further 2,500m 2of 0.6m thick reinforced insitu dry concrete diaphragm wall.

The contract calls for 125,000m 3of bulk etcavation, 4,800m 2of blinding concrete base and installation of 14, 900mm diameter pumping wells.

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