Structure and method for treating severe disengagement, cracking and other defects of tunnel lining

Abstract

The invention discloses a structure and method for treating severe disengagement, cracking and other defects of a tunnel lining. According to the method, original defective secondary lining concrete is chiseled away, and an inverted trapezoidal groove with the inside being wide and the outside being narrow is formed; steel bars are embedded in the middle of the groove in the annular direction and the longitudinal direction, and meanwhile, the steel bars and the original concrete are anchored integrally; self-propelled hollow grouting anchor rods are drilled in the groove area and surrounding the groove at the same time, and the outer side and the inner side, close to the secondary lining, of each anchor rod are wrapped with two water-swelling rubber water stop strips; and after a formwork is erected on the outer surface of the secondary lining, micro-expansion concrete is poured into the groove and is tightly connected with an original primary support and the secondary lining, so that a new lining structure is formed, the outer surface area of the micro-expansion concrete extends around till reaching the design thickness of the secondary lining and then extends again by 80-100 cm within which steel belts are hung for anchorage. The structure and method can effectively treat the defects of severe cracking and disengagement of the lining, the structure stability is good, the mechanical property is high, the problem that the defects occur again in the later period is avoided, the treatment method is high in operability, safe and reliable, and great economic benefits are achieved.

Description

[0001] Technical field: [0002] The invention belongs to the technical field of tunnel engineering maintenance, and in particular relates to a structure and a treatment method for diseases such as severe voiding and cracking of tunnel lining. [0003] Background technique: [0004] In recent years, with the continuous development of my country's transportation construction, the scale and number of tunnel projects have increased significantly, but a series of engineering problems have also emerged. On the one hand, during the construction process, due to improper construction or other reasons, the back of the secondary lining is voided, causing the lining to crack due to uneven stress; Geology, meteorology, topography and other conditions are becoming more and more complex. After the tunnel has been put into operation for a certain period of time, the secondary lining often suffers from cracking, spalling, falling blocks and other diseases. When these diseases are serious, it w...

AI Technical Summary

Problems solved by technology

However, when the disease is serious, these conventional treatment methods make the water leakage problem of the lining structure unavoidable. At the same time, the bearing capacity of the repaired structure is not high, and the disease recurrence is prone to occur later

And there is no condition for the tunnel to be demolished and rebuilt.

Images