| 摘要 |
PURPOSE: A displacement control tunneling method using pressurization is provided to restrain displacement and surface subsidence on the soft ground to the utmost by restoring displacement to an excavation face and increasing stiffness by compression of the ground. CONSTITUTION: A displacement control tunneling method using pressurization comprises the steps of press-fitting a reinforcement material to the contour of an excavation face, injecting an injection material for reinforcement including cement milk to the inside of the reinforcement material, installing plural front bolts in the direction excavation from the excavation face, excavating 50cm~100cm from the excavation face, installing a steel rib to the excavation face, installing a pressure bag between the steel rib and the lower part of a structure or the inner circumference of a tunnel and injecting cement milk into the pressure bag, and then pressurizing, installing a reinforcement cage between steel ribs and placing shotcrete inward, and repeating above-mentioned steps until completing the excavation for the lower part of the structure or the tunnel, and then placing lining concrete to the steel rib and the inside of shotcrete.
|
