A method for improving the secondary lining of tunnels in lining mold construction

Abstract

The invention discloses a method for repairing the second lining of the tunnel in the lining mold construction, which comprises the following steps: 1. Installing the steel arch frame; 2. Gouging the inner wall of the second lining of the tunnel; Lining mold construction: along the longitudinal extension direction of the tunnel, the concrete lining is molded from the back to the front, and the concrete lining is divided into multiple lining segments from the back to the front. The present invention is reasonable in design, simple in construction and good in use effect. Seven lining forming formworks are assembled to form an arched formwork for forming and constructing the constructed lining. At the same time, an assembled scaffold is used and the construction is carried out from bottom to top through the arched formwork. The lining is poured in sections; the assembled scaffolding used is easy to disassemble and assemble on site, which can effectively speed up the construction efficiency of the lining; at the same time, the vault pouring section of the constructed lining is poured through the vault pouring structure to ensure that the vault pouring The concrete density and molding quality of the section can ensure the secondary renovation effect of the tunnel.

Description

technical field [0001] The invention belongs to the technical field of tunnel secondary lining renovation construction, and in particular relates to a tunnel secondary lining renovation method for lining mold construction. 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, the karst strata tunnel) is completed...

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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