Lining structure and method of shield tunnel with super long service life in high corrosion environment

Abstract

The invention discloses a lining structure and method of a shield tunnel with the super long service life in the high corrosion environment. The lining structure comprises prefabricated reinforced concrete lining segments (1) and a reinforced secondary lining (2). The prefabricated reinforced concrete lining duct pieces (1) comprises, from outside to inside, outer side rebars in prefabricated ductpieces (3), prefabricated duct piece middle layer rebars (4) and prefabricated segment inner side rebars (5). The reinforced secondary lining (2) comprises secondary lining load-bearing bars (6). Theinvention further discloses a lining method of the shield tunnel with the super long service life suitable for the high corrosion environment. According to the lining structure of the shield tunnel with the super long service life in the high corrosion environment, in the long run, after the rebars on the inner side and the outer side of the duct pieces rust and lose efficacy, uncorroded parts ofthe interior of the existing duct pieces are fully used, and reinforced concrete pouring is carried out on the inner side, so that the technical scheme of superposition structure by outer side reinforce concrete duct pieces and inner side cast-in-situ lining is achieved, and service life prolonging of the tunnel lining structure is achieved.

Description

technical field [0001] The invention belongs to the technical field of tunnel engineering, and more specifically relates to a shield tunnel lining structure and method with an ultra-long service life in a strongly corrosive environment. Background technique [0002] At present, there are two types of shield tunnel lining structure, one is a single-layer prefabricated segment lining, and the other is a double-layer lining structure composed of a prefabricated lining segment and an internal cast-in-place concrete lining. Prefabricated lining segments are generally made of reinforced concrete. In strong corrosive environments such as seawater, chloride ions penetrate into the surface of the steel bar and the chloride ion concentration reaches a critical value, which will break down the passivation film on the surface of the steel bar and cause corrosion of the steel bar, resulting in a decrease in the structural bearing capacity. drop until lost. In order to ensure the designe...

AI Technical Summary

Problems solved by technology

However, no matter whether the surface of the segment is made of anti-corrosion coating or epoxy steel bars are used, the service life can generally be extended by 15-20 years; in addition, the joint waterproof gasket of the shield tunnel segment is generally arranged on the outside, along with the outer gasket of the segment Corrosion of steel bars near the groove, and the concrete near the gasket groove will peel off, causing waterproof failure

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