เกจวัดแรงดูด retains Tunnel boring machine (TBM) cool by a continuous water supply. The Cross Rail challenge is an east-west rail route that passes beneath the city of London using new twin-bore 21km tunnels.
EuroFlo pumps and the tanks are located on the floor; the water is pumped from there right down to the shaft and all along the tunnel as much as the TBM. Once the water has passed through the TBM system the remaining water comes back via a filtration system to the tanks on the floor, out of the tunnel.
The water circuit provides 20 l/s to every TBM and eight l/s is used in the TBM for different works and 12 l/s returns to the tanks. The inlet pressure needed ranges between four and 10 bar. On one site three TBM’s are working and the pump system delivers 60 l/s, with the tools consisting of one single tank (3200m3) and one industrial pump used per tunnel. On one other site, the installation support’s the excavation with only one TBM with 20 litres/second and the water storage tank capacity of 1100m3
EuroFlo use 37 kW vertical multistage Industrial pumps for the cooling system whereas the TBM excavates by way of a serious underground part of the Cross rail project.
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