Construction method for tunnel contact passage in shield section of underground railway

Abstract

The present invention relates to a construction method of underground railway shield-driven running tunnel interconnecting channel. It is characterized by utilizing steel segments of downward tunnel to make grid front earth-cutting device, connecting said grid front earth-catting device with pipe-jacking equipment to form grid squeeze-type pipe-jacking machine, jacking to upward tunnel from downward tunnel and adopting prefabricated composite steel pipe components to assemble them to form the invented interconnecting channel. Said onstruction, method includes the following processes; consolidating earth body in tunnel portal entrance and exit zone, jacking axis measurement setting-out, creating concrete pipe segment supporting system, jacking pie and making pipe go out of tunnel, setting water-proofing seal rubber band, laying guideway, arranging stress-releasing holes, blocking tunnel portal and grouting mortar, etc.

Description

Technical field: [0001] The invention relates to a construction method of an underground passage, in particular to a construction method of a tunnel connection passage in a shield section of a subway using a pipe jacking method. Background technique: [0002] In general subway projects, communication passages (bypass passages for short) are set up between the uplink and downlink tunnels, so that in the operation of the subway, when a fire or accident occurs in one of the interval tunnels, passengers can get off immediately and pass through the set bypass passages immediately. Evacuate safely to another tunnel. [0003] Nowadays, the construction of the connecting passage of the subway tunnel adopts the construction technology of freezing method reinforcement and then mining method excavation widely. The so-called freezing method construction is to use artificial refrigeration technology to freeze the water in the formation, turn the natural soil into frozen soil to increase...

AI Technical Summary

Problems solved by technology

[0005] The above-mentioned freezing method can be applied to various constructions passing through unstable alluvium and fractured aquifers at present, but there are following deficiencies: (1) The freezing method construction preparation period and implementation period are all long, and the monitoring and stabilization time in the later stage are also long; (2) The freezing method will inevitably produce large frost heave and thawing settlement during the implementation process, which will inevitably cause adverse effects on the surrounding environment; (3) At the same time, due to the many uncertain factors of the underground conditions, it is difficult to achieve the ideal soil reinforcement by the freezing method state, thus bringing hidden dangers to the long-term stability and safety of the communication channel; (4) the manual excavation method is adopted, and the soil body is completely exposed during the construction period, and once it encounters dangers such as quicksand, it cannot be effectively controlled; (5) the construction higher cost

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