Shield tunnel segment joint sealing gasket with concave and convex cross section forms

Abstract

The invention relates to a shield tunnel segment joint sealing gasket with concave and convex cross section forms. The shield tunnel segment joint sealing gasket comprises a pair of sealing gasket bodies with different cross section forms, the sealing gasket bodies are a convex sealing gasket and a concave sealing gasket respectively, a lug and a pressing groove which cooperate with each other arearranged on the contact surface between the convex sealing gasket and the concave sealing gasket respectively, the outer surface of the lug and the inner portion of the pressing groove are provided with water swelling rubber blocks respectively, the other face where the convex sealing gasket is not in contact with the concave sealing gasket is called as a lower end face, and the lower end face comprises a lower groove fracture surface and pre-buried rubber belts arranged on arch feet at the two sides. The shield tunnel segment joint sealing gasket can strengthen the connection and waterproofability of the contact face between the sealing gasket and a sealing groove.

Description

technical field [0001] The invention belongs to the field of shield tunnel engineering, and more specifically relates to a composite sealing gasket for segment joints of shield tunnels. Background technique [0002] At present, shield tunnels are assembled by prefabricated segments. After the shield tube ring is formed, transverse and longitudinal joints are formed between the segments. In order to prevent leakage of segment joints caused by the water level outside the shield tunnel, usually The joints of the segments mainly use sealing grooves and gaskets to achieve waterproofing through assembly and extrusion. [0003] In engineering, the EPDM material is generally molded into an elastic gasket with a certain cross-section. The composite gasket is vulcanized and embedded in water-swellable rubber on the top of the EPDM rubber gasket to achieve the secondary waterproof performance of the gasket. . However, as the buried depth of newly-built shield tunnels continues to inc...

AI Technical Summary

Problems solved by technology

The leakage of the contact surface between the gasket and the sealing groove is due to two aspects. Firstly, the gap between the joints of the segments is too large, which leads to the amount of opening and the amount of misalignment, and the contact stress on the contact surface is too small. The grooves may separate due to excessive friction, resulting in the failure of the waterproofing of the segment joints

[0004] Therefore, the traditional EPDM gasket cross-section form and waterproof ideas can no longer meet the engineering needs. In view of the reasons for the leakage of the gasket contact surface proposed above, it is necessary to provide a new type of elastic gasket cross-section form so that it can meet the requirements of the project. Precisely control the staggering of segment joints, improve the waterproof performance between the gasket contact surfaces, and at the same time strengthen the connection between the gasket and the sealing groove

Images