Karst stratum tunnel secondary lining renovation construction structure and method based on sleeve lining

Abstract

The invention discloses a karst stratum tunnel secondary lining renovation construction structure and method based on a sleeve lining. The structure comprises a grouting anchoring structure for supporting a tunnel section arch wall needing to be renovated and a strengthening sleeve lining for strengthening the tunnel section arch wall needing to be renovated. The strengthening sleeve lining is arranged on the inner side of a tunnel secondary lining, and the grouting anchoring structure is arranged on the outer side of the strengthening sleeve lining. The method comprises the steps including the first step of structural steel arch frame installing, the second step of grouting anchoring construction, the third step of tunnel secondary lining inner wall roughening treatment, the fourth step of arch-shaped steel bar structure construction and the fifth step of concrete sleeve lining construction. According to the karst stratum tunnel secondary lining renovation construction structure and method, design is reasonable, construction is simple and convenient, and the usage effect is good; the surrounding rock on the outer side of the tunnel section needing to be renovated is integrally strengthened through the grouting anchoring structure, and the tunnel outer side surrounding rock and the tunnel support structure are fastened and connected into a whole; and meanwhile, the strengthening sleeve lining is arranged in the tunnel secondary lining, the support strength and the support effect of the constructed formed sleeve lining are further effectively improved, and the renovation effect of the tunnel secondary lining is ensured.

Description

technical field [0001] The invention belongs to the technical field of tunnel secondary lining renovation construction, and in particular relates to a lining-based construction structure and method for secondary lining renovation of tunnels in karst formations. Background technique [0002] With the continuous development of high-speed railways, single-hole and double-track tunnels that pass through complex geological conditions are becoming more and more common, and the number of tunnel defects that they face is also increasing. The upper part of the lining concrete is voided and the steel frame is twisted and deformed, which further increases the risk of collapse and seriously threatens driving safety. Karst geology is mainly the result of chemical dissolution and mechanical damage to soluble rock formations due to runoff, recharge, infiltration and circulation of surface water and groundwater. After the construction of the tunnel passing through the karst strata (that is...

AI Technical Summary

Problems solved by technology

However, when renovating the secondary lining of the tunnel passing through the karst stratum, due to the characteristics of rich water, karst caves, faults, high ground stress, dangerous rockfall, and bedding bias in the stratum where the cave body is located, it is only constructed in the secondary lining of the tunnel Concrete lining cannot be used as a substrate to solve the disease of the second lining of the tunnel, and it cannot effectively control the disease of the hollow and cracked section of the second lining of the tunnel

Moreover, currently, when lining is used to remediate the secondary lining disease of tunnels in karst strata under complex geological conditions, there is no set of unified, standard and standardized construction methods to follow. In actual construction, it is inevitable that the construction operation is relatively random, There are many problems such as low construction efficiency and the quality of the formed bushing cannot be guaranteed.

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