Restoration method of inverted arch in operating tunnel

Abstract

The invention discloses a method for repairing an inverted arch of an operational tunnel, which comprises the following steps: drilling a row of anchor pipe holes at the left arch foot and the right arch foot of the inverted arch respectively, and then installing locking foot grouting anchors into the anchor pipe holes After the grouting, wait for the grouting strength of the anchor pipe to reach the qualified parameters, and then carry out the demolition of the pavement structure, backfilling of the inverted arch and the demolition of the inverted arch; the waste generated after completion Carry out clearing and transportation; after completion, base replacement, base grouting and base pile foundation are carried out; the reinforced concrete structure of the inverted arch is replaced with a steel concrete structure; after the construction is completed, the drainage system and the restoration of the pavement structure, this technical plan The repair method reduces the steps of intensive binding of steel bars, thereby effectively reducing the construction personnel and construction period, and reducing the steps of removing the steel support on the air surface. The support of the upper structure improves the safety of operation.

Description

technical field [0001] The invention relates to the field of tunnel construction, in particular to a method for repairing an inverted arch of an operating tunnel. Background technique [0002] The main design measures for pavement cracking and deformation include: tunnel bottom replacement, invert reinforcement, invert addition, invert deepening, tunnel bottom pile foundation, tunnel bottom grouting, and wall corner locking. Among them, invert reinforcement, addition of invert and deepening of invert as the three methods of tunnel invert repair design have good treatment effects, and are commonly used treatment measures for pavement deformation and cracking diseases. [0003] At present, the progress of repairing the inverted arch is slow and the construction quality is poor. Inverted arch restoration construction requires tunnel closure construction, and operating tunnels, especially expressway tunnels, have a large traffic volume and huge traffic operation pressure. The t...

AI Technical Summary

Problems solved by technology

However, the above two measures cannot effectively ensure that the tunnel structure is closed and forms a ring, and the stress conditions of the upper lining structure cannot be effectively improved; at the same time, the construction and removal of temporary supports is time-consuming and labor-intensive, and the purpose of rapid construction cannot be achieved.

Due to the high risk of demolition construction, the footage needs to be controlled for each demolition. In order to ensure the progress, the only way to increase the working surface is to cause a large number of workers to be piled up on the site and a large number of temporary supports, which increases the management risk and cost of the construction unit.

At present, there is no construction equipment specially for inverted arch repair, and improper equipment selection will also affect the construction speed

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