Pre-added axial force based circular support system in shield tunnel and construction method of system

Abstract

The invention relates to a pre-added axial force based circular support system in a shield tunnel and a construction method of the system. The circular support system comprises an annular section steel and steel plate combination, bearers vertical to a shield segment are arranged between the section steel and steel plate combination and the shield segment, the section steel and steel plate combination is divided into multiple segments in the circumferential direction, each segment comprises arc-shaped section steel, the different segments of the arc-shaped section steel are connected via connecting steel plates, and connecting positions are provided with spiral jacks. The spiral jacks apply pressures, the pressures are transferred to the bearers, so that a stress is distributed in the shield segment uniformly, and the continuous rigid integral support system with a pre-stress is formed; and thus, the shield segment is reinforced and supported effectively, and the shield segment is prevented from deformation, cracking, damage and even a safety accident due to concentrated pre-stress of holes in the shield segment in a connection channel.

Description

technical field [0001] The invention belongs to the technical field of tunnel engineering structures, and in particular relates to a circular support system in a shield tunnel based on pre-applied axial force and a construction method thereof. Background technique [0002] With the continuous development of urban construction, the demand for rail transit construction is also increasing dramatically. Due to the influence of factors such as land acquisition and demolition, pipeline relocation, and traffic relief in the early stage of the project, the construction period in the later stage is often restricted, and cross-operation between the tunnel auxiliary structure communication channel and track laying construction is common. Before the construction of the communication channel, it is necessary to support the segment at the opening and adjacent positions in the hole to prevent deformation, cracking and damage of the segment and even safety accidents. The support in the tun...

AI Technical Summary

Problems solved by technology

The support in the tunnel usually adopts conventional "well"-shaped steel support, which is slow to install, difficult to apply prestress, occupies a large area of ​​space, inconvenient for personnel to pass after installation, construction vehicles cannot pass through, and track laying operations cannot be carried out during the construction of the communication channel and its construction work seriously affect the construction period

Therefore, the conventional "well"-shaped steel support is no longer suitable and needs to be adjusted accordingly

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