Prestressed Shield Tunnel Structure with Strong Rigidity and Low Reinforcement and Its Construction Method

Abstract

A prestressed shield tunnel structure with strong rigidity and low reinforcement and its construction method. The tunnel structure includes multiple shield pipe rings, a circumferential prestressed structure and a longitudinal prestressed structure. Each shield pipe ring is composed of multiple shield pipe rings. The slices are connected as a whole through the circumferential prestressing structure, and the multiple shield pipe rings are connected through the longitudinal prestressing structure to form the overall frame of the prestressed shield tunnel structure. Circumferential prestressing, multiple longitudinal shield segments are connected into a whole through longitudinal prestressing structure and longitudinal prestressing is applied to them; thus, the present invention can improve the overall rigidity of the tunnel structure in the hoop direction and longitudinal direction, and can effectively solve the problem of The defects of the existing shield tunnel structure, such as low rigidity and insufficient deformation resistance, fundamentally improve the overall stiffness, stability, bearing capacity, deformation resistance, and waterproof capacity of the tunnel structure, ensuring structural safety and reasonable stress. Construction is convenient.

Description

technical field [0001] The invention relates to the technical field of underground structural engineering of urban rail transit and municipal engineering, in particular to a prestressed shield tunnel structure with strong rigidity and low reinforcement and a construction method thereof. Background technique [0002] Shield tunneling is widely used in urban rail transit and municipal underground projects in my country because of its advantages such as high degree of mechanization, fast operation speed, less on-site wet work, and labor cost savings. However, in the shield tunnel structure project that is in operation, many diseases such as leakage of shield tunnel structure, uneven settlement, and headroom convergence that do not meet the requirements have occurred. Especially in Jiangsu, Zhejiang and Shanghai areas, most of the rail transit tunnels are located in silty soft soil layers, which have large void ratio, high water content, high compressibility, high sensitivity, l...

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a kind of high-rigidity low-reinforced prestressed shield tunnel structure and its construction method, which can improve the circumferential and longitudinal overall stiffness of the tunnel structure, and can effectively solve the low stiffness of the existing shield tunnel structure , Insufficient anti-deformation ability, fundamentally improve the overall rigidity, stability, bearing capacity, anti-deformation ability, waterproof ability of the tunnel structure, ensure the safety of the structure, and the force is reasonable and the construction is convenient

Images