Construction method for subway contact passage

Abstract

The invention provides a construction method for a subway contact passage suitable for a very thick Cenozoic stratum region with low heat conductivity and strong heat insulation effect. The method comprises five stages, namely construction preparation, construction of freezing holes, freezing, digging and supporting of the passage and a water collecting well and slurry filling in the back of a wall. The method specifically comprises the following steps of: performing the construction preparation, then forming the freezing holes under the condition that the thickness of a frozen soil curtain is ensured, adding short-range freezing holes on the upper parts of the bell mouths of the freezing holes, and detaching reserved steel pipe sheets at the opening of the passage by adopting a secondary hole forming technology; performing positive freezing after a freezing system runs normally, and making the freezing system perform maintenance freezing after the frozen soil curtain meets the design requirement; after the procedures are finished, performing the digging and supporting stage of the passage and the water collecting well; and pre-burying slurry pipes and filling slurry. By the construction method, the construction difficulty is reduced, the safety and the reliability of engineering are improved, the construction period is shortened, the construction efficiency is improved, and the quality of the engineering is ensured.

Description

technical field [0001] The invention relates to a subway construction technology, in particular to a subway channel construction method aimed at special geological conditions. Background technique [0002] The communication channel and the pump room are generally located at the lowest part of the tunnel between the two stations. In order to quickly and conveniently evacuate passengers to another section or a safe area in the event of an unexpected safety accident during the operation of the subway train, and to facilitate the accumulation of water in the tunnel collection and discharge. Although the construction of the subway has a history of more than 100 years, due to the objective conditions such as the large buried depth of the connecting channel, the complicated geological and hydrological conditions, and the constraints of the tunnel construction site and the surrounding environment, the construction technology content is high and the difficulty is great. Therefore, i...

AI Technical Summary

Problems solved by technology

Although the construction of the subway has a history of more than 100 years, due to the objective conditions such as the large buried depth of the connecting channel, the complicated geological and hydrological conditions, and the constraints of the tunnel construction site and the surrounding environment, the construction technology content is high and the difficulty is great. Therefore, its construction plan is always difficult to be very satisfactory.

At present, the construction schemes of communication channels at home and abroad are mainly limited to pipe jacking method, mine method, pipe shed method, and mine-like method. During the construction in the thick Cenozoic stratum area, there are problems in the frost heave hazard of the tunnel frozen hole, water and sand gushing, and the sealing of the frozen hole, which affects the overall safety of the project