Tunnel support structure passing underneath existing building and construction method

Abstract

The invention provides a tunnel support structure passing underneath an existing building and a construction method, and belongs to the field of tunnel engineering support. The structure is composed of load bearing anti-slide piles, a concrete filled steel tube beam and telescopic devices; the load bearing anti-slide piles are reinforced concrete piles; slurry-permeating steel pipes are connectedin sequence in a working well to form an exosmic steel pipe to be pushed to a receiving well, in this way, auxiliary pipes are connected in sequence and inserted into the exosmic steel pipe, the two ends of the exosmic steel pipe are blocked by means of circular steel plates, grouting is conducted in a gap of the steel pipes through a grouting hole, after the strength is met, the circular steel plates at the grouting ends and the auxiliary steel pipes are removed, concrete is poured into the exosmic steel pipe, and the concrete filled steel tube beam is formed; the end, provided with angle iron, of each telescopic device is connected with the bottom of the building through an expansion bolt, the other end of each telescopic device is welded to the exosmic steel pipe, reserved steel bars onthe tops of the load bearing anti-slide piles are inserted into holes formed in the two ends of the concrete filled steel tube beam, and the tunnel support structure is formed through grouting. The structure is simple in principle, reasonable in stress and capable of reducing the working space.

Description

technical field [0001] The invention relates to a tunnel support structure technology for passing through existing buildings, belongs to the field of tunnel engineering support, and is suitable for urban tunnel support engineering. Background technique [0002] The rapid development of urban construction has greatly promoted the construction of urban underground tunnels. Since underground tunnels are already quite dense in some prosperous large cities, it is inevitable that they will pass through existing buildings. When constructing under existing buildings, there are strict requirements on the supporting structure and construction methods of the tunnel. Insufficient bearing capacity of the supporting structure and excessive disturbance of the soil caused by improper construction methods will affect the normal use of the existing buildings. It may even lead to serious production safety accidents. At present, the existing tunnel construction methods for passing through exis...

AI Technical Summary

Problems solved by technology

When constructing under existing buildings, there are strict requirements on the supporting structure and construction methods of the tunnel. Insufficient bearing capacity of the supporting structure and excessive disturbance of the soil caused by improper construction methods will affect the normal use of the existing buildings. It may even lead to serious production safety accidents

At present, the existing tunnel construction methods for passing through existing buildings mainly include the shield tunneling method and the underpinning method of supporting pile structures, etc. The shield tunneling method can successfully complete the shield tunneling through the existing buildings without using any auxiliary construction methods However, because the tunnel deformation is controlled only by its own construction parameters, the construction risk is still very high for super high-rise buildings passing under it; the supporting pile structure underpinning method can transfer the building load to the soil on both sides of the tunnel Among them, the load on the top of the tunnel is reduced, but this construction method requires a large construction space, and the disturbance to the existing buildings and the underlying soil is relatively large, and adverse consequences such as building inclination are prone to occur during the construction process

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