Construction method of shield continuously crossing vertical shaft under complex stratum conditions with high confined water

Abstract

The invention discloses a construction method for a shield to continuously pass through a vertical shaft under the condition of a complex stratum with high confined water, which includes: step 1, reinforcing the end; reinforcing the soil at the end of the vertical shaft, increasing the self-stability of the soil to ensure that seepage does not occur; Step 2: Break down the diaphragm wall of the portal and backfill the shaft; demolish the portal concrete of the shaft from bottom to top, remove the waste concrete in the shaft layer by layer, and use backfill materials to backfill the shaft; Step 3: Shield tunneling and tunneling process Monitoring in the process; step 4, grouting management at the back of the segment; when the shield machine exits and enters the tunnel through the shaft, the tail of the shield is strengthened for synchronous grouting before exiting the hole, and the wall thickness grouting effect is checked by radar, and the grouting is performed according to the wall thickness. The grout effect determines whether to carry out secondary grouting to ensure that the back of the segment is filled tightly and does not leak water into the second lining shaft. The method of the invention greatly reduces the risk of the shield tunneling through the vertical shaft caused by complex strata with high pressure water, and has simple construction method, low cost, fast speed of passing through the vertical shaft and short construction period.

Description

technical field [0001] The invention belongs to the technical field of shield tunneling method construction, and in particular relates to a construction method for shield tunneling to continuously pass through a vertical shaft under the condition of high confined water and complex stratum. Background technique [0002] The Shield Method is a fully mechanized construction method in underground excavation construction. It propels the shield machine in the ground, and supports the surrounding rock through the shield casing and segments to prevent collapse into the tunnel. At the same time, the soil is excavated with a cutting device in front of the excavation face, transported out of the hole by an excavation machine, pushed in by a jack at the rear, and assembled with prefabricated pieces to form a mechanized construction method of the tunnel structure. [0003] When the shaft is located in a complex stratum with high confined water, for example, the stratum crossed by the shi...

AI Technical Summary

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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