Box culvert advancing construction method for building new frame bridge above existing subway structure

Abstract

The invention discloses a box culvert advancing construction method for building a new frame bridge above an existing subway structure. The box culvert advancing construction method for building the new frame bridge above the existing subway structure includes: excavating a thrust pit in one side of a position above the existing subway structure, where the frame bridge is to be built; prefabricating a box culvert in the thrust pit, adding a balancer at the bottom of the interior of the box culvert, and guaranteeing that the sum of the weight of the balancer and the weight of the box culvert is equal to the weight of a soil mass which is excavated out; advancing the box culvert; after advancing the box culvert in place, simultaneously dismantling the balancer and constructing an accessory structure, guaranteeing that the weight of the dismantled balancer is equal to the weight of the constructed accessory structure, and then completing construction of the frame bridge. The box culvert advancing construction method for building the new frame bridge above the existing subway structure controls floating deformation of the existing subway structure through a box culvert advancing method achieved by adding the balancer during the process of constructing the new frame bridge above the existing subway structure, adopts the mode of adding the balancer during the box culvert advancing process, uses the weight of the balancer and the weight of the box culvert to make up the weight of the soil mass which is excavated out, and thereby prevents a soil body below the frame bridge from collapsing, controls deformation amount of the existing subway structure, reduces influences of construction on existing subway line running, and guarantees safe subway running.

Description

technical field [0001] The invention relates to a construction method for controlling the floating deformation of a subway structure by using box culvert jacking construction when building a frame bridge above an operating subway line, and belongs to the field of underground engineering. Background technique [0002] With the large-scale development of urban rail transit and the development and construction of municipal facilities, there are more and more projects crossing and crossing the operating subway lines such as urban roads and drainage box culverts. Among these projects, most of them use convenient box Contains the open cut construction method, but the construction will inevitably disturb the surrounding soil, causing the underlying soil to spring back and deform, which in turn will drive the structural deformation of the operating line, affect the speed of the train, and even endanger the safety of the train. [0003] Specifically, at present, the construction of b...

AI Technical Summary

Problems solved by technology

[0004] First, with the development of the network of rail transit lines, the passenger flow has increased greatly, and the interval between trains has been shortened, especially in routes with heavy traffic or relatively high operational requirements, the construction of box culverts during open-cut construction may cause Train speed limit or outage will have a greater impact on rail traffic

[0005] Second, the excavation of the foundation pit in the open-cut construction will cause the unloading of the underlying soil, which will cause the underlying soil to float and deform. This deformation is generally uncontrollable, and the track structure of rail transit needs to maintain a high degree of smoothness. To meet the requirements of driving safety and comfort

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