A construction method for the communication channel of the broken stratum in the shield tunnel crossing the river

Abstract

The invention relates to a construction method for an underground tunnel, in particular to a construction method for a river-crossing shield tunnel crushed stratum communication channel, which is used for solving the problems of failure of stratum reinforcement, long working period, high cost, poor quality and the like existing in the construction process of the conventional river-crossing shieldtunnel crushed stratum communication channel. The method comprises the following steps of: determining the position of the communication channel; before opening, performing pre-grouting to integrallyconsolidate broken rock outside the excavation outline of the communication channel; forming a high-strength waterproof curtain; before excavation, performing stress conversion; drilling and partitioning to remove a left line pipe sheet, brushing the top, performing tunnel excavation with a combined damping burst technology, and timbering; and drilling and partitioning to remove a right line pipesheet, brushing the top, and performing second lining construction by adopting a combination template. Due to the adoption of the construction method, water seepage is avoided after excavation, the technology is advanced, the blank of a communication channel pre-grouting technology is fulfilled, the working period is short, the mechanical degree is high, the process is simple, construction is environmentally-friendly, collapse is avoided, and over-excavation is greatly lowered; and the method has a wide application range.

Description

technical field [0001] The invention relates to a construction method of an underground passage, in particular to a construction method of a communication passage in a broken stratum of a river-crossing shield tunnel. Background technique [0002] Communication channel construction is usually carried out in shield tunneling projects, so that during subway operation, when a fire or accident occurs in one of the interval tunnels, passengers can immediately and safely evacuate to another tunnel through the set communication channel. In the previous projects, the ground reinforcement method of the communication channel in the shield tunneling project was reinforced by one or more combinations of stirring pile reinforcement, rotary grouting pile reinforcement, grouting reinforcement or freezing method reinforcement methods, and mine method for excavation. However, when constructing communication channels in the fractured zone across the river, due to the abundant groundwater, st...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problems of stratum reinforcement failure, long construction period, high construction cost and poor construction quality in the construction of the existing river-crossing shield tunnel broken stratum communication channel, the present invention provides a new river-crossing shield tunnel broken stratum communication channel. Construction method