Box-raft pressure-bearing type foundation underpinning and construction reinforcing method for tunnel across pile foundation of bridge above river

Abstract

The invention relates to a geotechnical and underground engineering technology field, particularly to a box-raft pressure-bearing type foundation underpinning and construction reinforcing method for tunnels across pile foundations of a bridge above a river. The method of the invention comprises: reinforcing abutment foundation of both sides of the bridge, reinforcing the riverbed outside the cofferdam construction and abutment, strengthening bridge supports, excavating pits under cofferdam bridges, strengthening expanding plate-type foundations inside the pits and ground base under the plates, as well as shield tunneling and removing obstructive file base. The method can smoothly complete construction and guarantee smooth shield tunneling while ensuring normal passage of existing bridge structure, further can effectively reduce construction risk, accelerate construction process, reduce cost and reduce influence to environment to a maximal extent.

Description

technical field [0001] The invention belongs to the technical field of geotechnical and underground engineering, and in particular relates to a box-raft pressure-bearing foundation underpinning and construction reinforcement method for a bridge pile foundation above a river where a tunnel crosses. Background technique [0002] With the acceleration of urbanization, traffic congestion is becoming a bottleneck restricting its development, and the ever-increasing passenger flow has put forward higher requirements for the development of Shanghai's urban construction. In view of the fact that rail transit, as a large-capacity rapid transit system, is playing an increasingly important role in the entire urban passenger flow transportation, major cities in the world have taken the construction of rail transit networks as the focus of urban infrastructure construction, and the construction of rail transit has entered the a period of concentrated development. Represented by the cons...

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Problems solved by technology

Although this method is more feasible when the construction scale is small and the traffic impact time is short, the disadvantages are: (1) it has high requirements for the construction period, cost and surrounding environment; (2) it needs to demolish two Bridges and building two bridges are not only time-consuming and labor-intensive, but also very expensive; (3) For important sections that require traffic not to be affected, this method will have a greater impact on ground traffic and bring negative social effects; or when it cannot be otherwise When opening up space to build temporary bridges, the application of this method is often subject to many restrictions

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