Reinforcing structure and method for under-crossing structure in soft-soil water-rich large-section tunnel group

Abstract

The invention relates to a reinforcing structure and method for an under-crossing structure in a soft-soil water-rich large-section tunnel group. The reinforcing structure involves an existing structure above a tunnel and a concealed tunnel group structure below the tunnel; vertical formation reinforcing flexible posts arranged in transverse direction are constructed at the ends of concealed tunnels on two sides of the existing structure above the tunnel; reinforcing width of the vertical formation reinforcing flexible posts is extended outside a tunnel excavation line by a certain distance; ahorizontal underpinning pipe shed is arranged at the bottom of the existing structure above the tunnel; horizontal formation reinforcing waterstop posts are arranged on two sides and arches of the concealed tunnels; the ends of the horizontal formation reinforcing waterstop posts are in lap joint with the horizontal formation reinforcing waterstop posts; a concealed advanced pipe shed is arrangedaround the concealed tunnels. The reinforcing structure and method have the advantages that construction in soft soil and saturated water-rich formations is convenient, the reinforcing structure hasgood leakproof property, safety construction can be ensured for the concealed tunnels, settling deformation of the structure above the tunnel can be controlled very effectively, and normal use of thestructure can be guaranteed.

Description

technical field [0001] The invention belongs to the technical field of underground engineering construction, and in particular relates to a reinforcement structure and a method for passing through structures under a group of tunnels with rich water and large sections in soft soil. Background technique [0002] With the continuous construction of urban underground projects and the increasing development of rail transit, cross-construction forms such as overspan and underpass between new projects and existing projects are emerging. Shallow-buried large-section tunnels and tunnel groups in soft soil and water-rich strata are prone to risks such as sandblasting and water gushing, excessive ground subsidence, excessive primary support deformation, and even partial collapse, especially when there are sensitive structures on the ground , Large-diameter pipelines, when the open-cut construction conditions are not available, it is difficult to meet the deformation control requirement...

AI Technical Summary

Problems solved by technology

Shallow-buried large-section tunnels and tunnel groups in soft soil and water-rich strata are prone to risks such as sandblasting and water gushing, excessive ground subsidence, excessive primary support deformation, and even partial collapse, especially when there are sensitive structures on the ground , Large-diameter pipelines, when open-cut construction conditions are not available, it is difficult to meet the deformation control requirements by using the traditional underground excavation method, and the construction will seriously affect the structural safety and normal use functions of the structure

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