Process for quickly repairing damaged shield tunnel structure under special limiting conditions

Abstract

The invention discloses a process for quickly repairing damaged shield tunnel structures under special limiting conditions. The process comprises the following steps that firstly, damaged segments are cleaned; a steel emergency closing part is installed according to the size of the damaged surface, and a connecting seam is secondarily sealed; interface treatment is carried out on the damaged edge of the cleaned segments, and then a steel bar network is connected through a reserved embedded steel bar connecting sleeve of the steel emergency closing part; an emergency repair concrete pouring formwork is installed and supported; concrete is poured into the emergency repair concrete pouring formwork; and the repairing concrete and the peripheral segments are integrally bonded and reinforced. Aiming at emergency repair when the shield tunnel structure is damaged due to sudden foreign objects on the foundation of the upstream face of the shield tunnel or traffic collision in the tunnel and other sudden problems, the steel emergency closing part is adopted, rapid assembling, closing water stopping and reinforcing embedded steel bars can be achieved, and water gushing and sand gushing problems caused by sudden segment damage are effectively solved; and high-density cement capillary crystalline materials are used for treating a new interface and an old interface of the concrete.

Description

technical field [0001] The invention relates to the technical field of emergency repair construction, in particular to a technology for rapid repair of damaged shield tunnel structures under special constraints. Background technique [0002] In recent years, the application of shield tunneling technology in my country has developed rapidly. From urban rail shield tunnels to expressway tunnels, high-speed rail tunnels, traffic tunnels in alpine regions, and large rivers and submarine tunnels, the shield tunneling technology has been continuously innovated and iterated. The installation of the shield segment still mostly adopts the ring-mounted splicing segment. This kind of segment is connected by concave-convex slots, arranged in sequence, and mutually stressed. Once a piece of structural damage occurs, it is impossible to directly remove and replace the segment. Can be repaired locally. [0003] As far as urban subways are concerned, with the development of urban rail transi...

AI Technical Summary

Problems solved by technology

[0004] In December 2017, when a non-subway construction party in the southeast corner of Shenzhen Bay Sports Center was driving pilings, the cement piles were directly driven into the tunnel of Metro Line 11, resulting in a Catenary equipment was damaged, a train crashed into a cement pile driven into the tunnel after emergency braking, and subsequent train operations were affected

In addition, many underground shield tunnels are subject to vibrations and disturbances during long-term operation, and the splicing of segments is too tight during construction, resulting in segment damage, large-area cracks, and segments that cannot be replaced when they are put into operation later. The pieces are spliced ​​into building block construction, once quality problems occur, it will become a major safety hazard

[0006] There is no domestic response plan for this kind of emergency rescue work. The cause of the accident is sudden, the safety factor of temporary construction is low, the repair speed is slow, and the integrity of the later stage is poor. The materials for temporary sealing have not been thoroughly discussed, and the research cannot form a long-term technical plan.

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