Method for constructing karren stratum shield tunnel

Abstract

The invention relates to a technology for constructing a karren stratum shield tunnel, in particular to a method for constructing a karren stratum shield tunnel, aiming to overcome the defects of the traditional method. The method for constructing the karren stratum shield tunnel comprises the following steps: (1) optimizing tunnel entrance steel ring structures: arranging elastic rubber water stopping rings in tunnel entrance steel rings, rubber water stopping curtain fabric on the outmost end and slurry injection holes and slurry injection pipes at the periphery; (2) constructing enclosing and protecting structures of a station by adopting glass fiber reinforced bars so that a shield machine enters the shield tunnel by shearing; (3) during the construction of the body of the station, making the shield machine move forward rapidly so that folding plates outside the rubber water stopping curtain fabric are overlapped on cutter discs, and injecting shield machine tail grease between the two rubber water stopping curtain fabric through injection holes; and (4) splicing shield tunnel pipe pieces, connecting the shield tunnel pipe pieces into a whole by using I-shaped steel, and supplementing slurry for the second time after the tail of the shield machine enters between the rubber water stopping curtain fabric. The shied machine can enter the shield tunnel safely and rapidly, and the method for constructing the karren stratum shield tunnel has simple working procedures, adopts the advanced technology, is safe and reliable, fills the blank of the technology for constructing the non-reinforced shield tunnel and has good popularization prospect.

Description

technical field [0001] The invention relates to the anti-piping and anti-collapse construction technology of a shield tunnel entrance in a dissolved trench stratum, in particular to a shield tunnel entry construction method in a dissolved trench stratum. Background technique [0002] China's urban subway construction has entered a stage of rapid development. The most critical technology for shield excavation is the shield tunnel entry and exit. At present, various reinforcement methods can only be used for end reinforcement, and then shield tunnel entry. However, in sand and pebble formations, no matter what Neither type of reinforcement can meet the requirements of shield tunneling, and accidents in shield tunneling are currently the biggest source of risk in shield tunneling. [0003] At present, tunneling of subway shields is usually carried out with pre-reinforced, frozen or steel sleeves. These technical requirements are high, safety and quality are uncontrollable, and ...

AI Technical Summary

Problems solved by technology

[0017] In order to solve the problem that the traditional methods used in the tunneling of the shield tunneling formation have their own shortcomings, the present invention provides a construction method for shield tunneling in the tunneling formation of the melting trench, so as to realize the safety of the shield machine under non-reinforced conditions. into the hole

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