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Tunnel boring machine earth pressure balance - ø 1.6 - 15 m
Earth Pressure Balance Machines are designed for operation in soft or poor ground conditions in which there is underwater pressure. Ordinary TMS units cannot handle the challenges of loose sedimentary deposits with a high pressure of water, but the EPMS from Robbins can. These models have special shields that are sealed against the pressure of water inflow up to 10bar. They control tunnel face stability and ground surface subsidence by means of monitoring and adjusting the cutter-head chamber pressure. A balance is thus achieved with the pressure in front of the cutter-head. The working area inside of the machine is entirely sealed against water pressure of the surrounding ground. Fluidized muck in front of the bulkhead and behind the cutter-head is eliminated with a screw conveyor.