The mileage of liaohe shield tunnel tunneling exceeded 600 meters

On December 10, the length of the liaohe shield tunnel tunneling through the eastern route of the china-russia natural gas pipeline (changling-yonker) exceeded 600 meters, completing one third of the overall progress.

The directional drilling of xiliaohe river is located at the left wing rear banner of horqin city, tongliao city, Inner Mongolia autonomous region. The main pipe diameter is 1422mm and the crossing length is 1220m.

Liaohe shield fort is located in liaoning shenyang xinmin city feng nest village through liaohe main channel between sets of village, with the total length of 1820 meters of shield tunnel (two shaft center distance), the inner diameter of 3.08 meters, a total assembling segment 1505 ring, through geology mainly medium sand layer and silty clay layer, starting shaft diameter 16 meters, the depth of 24.9 meters, receiving shaft diameter 12.5 meters, the depth of 12 meters, adopt method of open caisson construction.

Since construction, the project faced with initial permeability sand layer and silty clay layer of shield tunneling, this project department elaborate organization, scientific management, high standards experts to evaluate the construction plan and organize, geological improvement and steel sleeve from technical, departure from sand problems in preparation of silty clay layer of shield excavation plan, and organize technical personnel to focus on learning, grasp the silty clay layer of shield tunneling characteristics and difficulties, to do a good job of technology, safety disclosure. The scientific arrangement of various works ensures the smooth construction of the tunneling on schedule.