TUNNEL CONSTRUCTION ENGINEERING CO.,CANADA - CTCE-a TBM comany

By: Tunnel Construction Engineering  09-12-2011

Single Shield SGC TBM CTCE TBMs consist of a Cutting wheel, Forward Shell, Stationary Shell, Trailing Shield as well as the Trailing Gear & Gantry. TMB can be designed to convert in order adapt to changing ground conditions.

There are following ways to control  CTCE SGC TBMS

1.FLEXIBLE Mode - When the tunnel face requires some support the TBM is operated by utilizing CTCE’s patented CTCEP technology. When the CTCEP are engaged, pressures of up to 3 bar can be maintained in the cuttinghead chamber.
Operation of the CTCEP can be manually or automatically controlled.

2. EPB Mode - This mode provides continuous support to the tunnel face by balancing the inside earth and water pressure against the thrust pressure of the machine. The ground excavated by the cuttinghead is mixed and accumulated under pressure in the cuttinghead chamber, and is then extracted by a Screw Conveyor. The pressure in the cuttinghead chamber is controlled by balancing the rate of advance of the machine and the rate of extraction of the excavated material by the Screw Conveyor.
Manual or automatic operation of the EPB system is possible through the integrated PLC and computer-control systems.

3. Fluid Pressure Balance Mode – The fluid excavation mode provides continuous support to the tunnel face by balancing earth and water pressure in the some soil with a pressurized bentonite slurry. This excavation mode provides continuous support to the tunnel face by balancing the inside earth and water pressure against the slurry pressure of the machine. The ground excavated by the cuttinghead is mixed and accumulated under pressure in the cutting wheel chamber, and is then extracted by a Screw Conveyor. The pressure in the cutting wheel  chamber is controlled by balancing the rate of advance of the machine and the rate of extraction of the excavated material by the Screw Conveyor.


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