Construction method of shield continuous shaft crossing under high-pressure-bearing water complicated stratum condition

Abstract

The invention discloses a construction method of shield continuous shaft crossing under the high-pressure-bearing water complicated stratum condition. The method comprises the following steps of: 1, end part reinforcement: reinforcing soil bodies at the shaft end part, and improving the self stability of the soil bodies to ensure the seepage flow avoidance; 2, tunnel face continuous wall breaking and removal and shaft refilling: breaking down and removing tunnel face concrete of a shaft layer by layer from bottom to top, clearing away waste concrete in the shaft layer by layer, and refilling the shaft by refilling materials; 3, shield tunneling and monitoring in a tunneling process; and 4, duct piece back grouting management: during shaft crossing tunnel exiting and tunnel entering of a shield tunneling machine, reinforcing the synchronous grouting by a shield tail before the tunnel exiting; inspecting the wall thickness grouting effect by a radar; determining whether secondary slurry replenishment is needed or not according to the wall thickness grouting effect; and ensuring the duct piece back filling compactness and the avoidance of water leakage towards a secondary lining shaft. The method has the advantages that the danger caused by high-pressure-bearing water complicated stratum condition during the shield shaft crossing is greatly reduced; the construction method is simple; the manufacturing cost is low; the shaft crossing speed is high; and the construction period is short.

Description

Technical field [0001] The invention belongs to the technical field of shield construction, and particularly relates to a construction method for a shield to continuously traverse a shaft under high-pressure-bearing water complex stratum conditions. Background technique [0002] Shield Method is a fully mechanized construction method in undercut construction. It pushes the shield machine into the ground and supports the surrounding rocks through the shield shell and segments to prevent collapse into the tunnel. At the same time, the cutting device is used to excavate the soil in front of the excavation, and the excavation machine is used to transport it out of the cave, press in the rear with a jack, and assemble the prefabricated pieces to form a mechanized construction method for the tunnel structure. [0003] When the shaft is located in a complex stratum with high confined water, for example, the stratum traversed by a shield is divided into two levels of water level: the groun...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a construction method for the shield tunnel to pass through the vertical shaft continuously under the condition of high confined water and complex stratum, so as to solve the great danger in the process of the shield tunneling through the vertical shaft, which is prone to water gushing, sand gushing, surface subsidence and even the second-lined shaft Technical Problems of Collapse Accidents

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