A shield tunnel segment structure and its connection structure

Abstract

The invention discloses a shield tunnel segment structure and its connection structure, comprising a segment body, characterized in that: the segment body is mainly composed of a steel plate layer, a concrete layer wrapping the steel plate layer, respectively located on both sides of the steel plate layer and It is composed of steel mesh embedded in the concrete layer; the side edge of the segment body is fixed with metal joints, and the outer side of the metal joints is provided with a groove for accommodating a waterstop. Waterstop: the outer side of the segment body is provided with an outer protective layer, and the outer protective layer is a polyurea layer compounded on the outer side of the segment body. The connecting structure is composed of two shield tunnel segment structures arranged adjacently and a connector connecting the two shield tunnel segment structures, and the connecting steel plate is composed of an arc section in the middle and straight sections on both sides. The invention has the characteristics of small thickness, high strength, and the joint is not easy to be damaged, and has good joint deformation control effect, good seam waterproof effect, high durability and convenient repair.

Description

technical field [0001] The invention relates to a shield tunnel structure, in particular to the design of a shield tunnel segment structure and a connecting structure between segments. Background technique [0002] In recent years, with the strengthening of investment in infrastructure construction, urban infrastructure construction has achieved rapid development. At the same time, after many years of operation, the tunnels built earlier have experienced problems such as longitudinal uneven settlement, lateral deformation, long-term leakage, joint damage, segment cracks and cracks, which have reduced the service quality of the tunnels and brought difficulties to the operation. Security poses a certain threat. [0003] At present, the shield tunnel structure generally adopts the assembly method of reinforced concrete segments, the internal bolt connection between the segments, and the joints are waterproofed by elastic gaskets or expanded rubber strips. For example, in the ...

AI Technical Summary

Problems solved by technology

[0004] The shield tunnel segment with the above structure has the following defects: 1. The connecting bolt installation hand holes and bolt holes are reserved on the segment, and the segment joints are connected by built-in connecting bolts. Although this structure can strengthen the tunnel structure as a whole However, the hand holes and bolt holes reserved for connecting bolts on the segment not only reduce the mechanical properties of the segment, but also easily form water leakage channels. In addition, the connecting bolts are built into the segment joint, which is not easy to remove repair

However, the protective layer at the joints is easily damaged under the action of local concentrated force when the tunnel is deformed, resulting in cracks, cracks, falling blocks, etc., forming leakage water channels, causing a large number of leakage water diseases; while in other positions , the tunnel structure buried underground for a long time is greatly affected by corrosive ions, and the concrete is easy to crack, which in turn causes corrosion of steel bars and affects the durability of the segment structure

3. The joints are waterproof. Generally, elastic rubber gaskets and water-swellable rubber strips are used at the joints, but they are easy to age, have low durability, and poor waterproof effects, especially glued to the surface of the segment. easy to fall off

Chinese invention patent application CN10476341A discloses a longitudinal seam joint of a shield tunnel segment, which increases the stress strength by locally thickening the connecting part of the segment, but it leads to the irregular shape of the segment inside, which is critical for increasing the cross-sectional space The effect is limited, and it cannot solve the aforementioned problems such as the mechanical properties and waterproof performance of the segment

Images