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Pumps go the distance

Plant review

Three stationary Putzmeister BSA pumps conveyed concrete for distances of up to 1,500km during track extension of Singapore's express metro lines (NCEI August 2000).

On the North East line, a joint venture of Tekken, Union and SP installed 20km of new track, mostly in tunnel. To cast the 10,000 concrete pads into a solid concrete track bed, the JV brought in two Putzmeister concrete pumps type BSA 2110 HP-D.

Concreting is carried out from both ends of the tunnel both pumps set up above the tunnels. because of space constraints. Putzmeister's ZX delivery lines conveyed the mix, the maximum distance being 1,000m.

In all, 80,000m 3of B45 concrete with a slump of 12.5mm to 16mm was delivered.

The same model was used on the extension of the line to Changi Airport, with the Balfour Beattry Gammon joint venture having to cope with still longer distances.

A specialist pump fitter ensured that that there were no problems with delivery - essential given the heat and time constraints of the job.

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