Goliath Pipe Rammer

Pipe-Ramming
We have long since successfully used our Goliath pipe rammer to drive steel pipes up to 1.2m diameter under train stations, train tracks, motorways, stone culverts, high pressure gas mains and high voltage electricity cables, all in soft grounds such as clays, silts and gravels. This system is as simple as excavate a launch pit typically 15m long, line up the open ended steel sleeve (typically a 914mm od with 18mm wall) on the proposed tunnel line, connect a large compressor to the rammer which is installed into the back of the sleeve, allow the pneumatic driven piston inside the rammer drive the open ended steel sleeve into the ground, remove rammer and weld on subsequent steel sleeves, reconnect rammer and repeat. Drive length of up to 80m have been achieved for 762mm od sleeves. The system only displaces the soil in front of the 18mm wall of the steel pipe therefore it is ideal where ground movement is critical. The soil swallowed by the pipe is only removed at the end of the drive therefore an open-face is never created thus eliminating the negative effects of dewatering. The soil is then removed from the sleeve shaft-to-shaft by welding a steel plate to one end and pressurising the soil column until it emerges like a ‘syringe’. Correct lubrication of the inner sleeve/soil interface is essential. It is not possible to steer the sleeve once launched, however when launched in lengths over 9m long it is similar to a driven pile in that it is difficult to deflect off line once embedded in the soil. The system has been used many times for graded sewers.

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