Transverse oval deformation resisting shield tunnel reinforcing structure comprising embedded steel plates and construction method

Abstract

The invention relates to a transverse oval deformation resisting shield tunnel reinforcing structure comprising embedded steel plates. The structure comprises a segment, the embedded steel plates, connecting steel plates, anchor bars, cables, connecting steel channels, a hydraulic jack and temporary grouting channels, wherein the embedded steel plates are arranged on the inner arc surface of the segment, the connecting steel plates are arranged between the adjacent embedded steel plates, and two ends of the connecting steel plates are connected and fixed with the embedded steel plates; the anchor bars are perpendicularly welded on outer sides of the embedded steel plates at equal intervals, one end of each anchor bar is arranged on the corresponding embedded steel plate, and the other endof each anchor bar is fixed and connected on a main bar of the segment; embedded connection devices are arranged on the embedded steel plates; each embedded connection device comprises an internal screw hole, a screw and an outer connector, the internal screw holes penetrate through embedded steel plates to be arranged in the segment, screws are arranged in the internal screw holes, and an outer connector is arranged at one end of each screw. The structure has the benefits as follows: the segment structure is reinforced in advance and high in bearing deformation resistance; prestressed cablesare arranged horizontally to limit outward displacement of the segment; small arches are formed at the top and the bottom to enhance longitudinal anti-pressure capacity.

Description

technical field [0001] The invention belongs to the technical field of shield segment reinforcement, in particular to a reinforcement structure and construction method of a shield tunnel with embedded steel plate anti-horizontal elliptical deformation, which is suitable for shield segment structures prone to transverse elliptical deformation due to longitudinal extrusion Reinforcement, especially for shallow shield tunnels affected by large-scale ground surcharge or lateral excavation of foundation pits and segment structures that require high structural stability and safety. Background technique [0002] Due to the advantages of environmental protection, high degree of mechanization, and construction and operation not restricted by climatic conditions, the shield tunnel assembled on-site with prefabricated segments has become an important structural form of municipal infrastructure such as urban rail transit. However, with the further development of urbanization, many urban...

AI Technical Summary

Problems solved by technology

Among them, aramid cloth reinforcement method and carbon fiber cloth reinforcement method, as an auxiliary segment reinforcement method, are only suitable for the reinforcement and repair of some small deformations, and it is difficult to resist the damage of large deformation structures.

The process of lateral grouting reinforcement method is complicated, there are many influencing factors, and the construction uncertainty is relatively large

Although the internal tension steel ring reinforcement method and the pasting composite cavity reinforcement method are relatively widely used, the construction operation is complicated and time-consuming, and there are many inconveniences in actual engineering.

[0004] To sum up, the existing tunnel reinforcement technology is still in the exploratory stage, the construction technology is not very mature, and the effect of preventing the transverse elliptical deformation of the shield tunnel is not ideal

In addition, the existing technology often has many limitations in actual engineering applications, such as complex construction operations, long reinforcement time, and unstable reinforcement effects, etc., which urgently need to be solved by improving the technology

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