A reinforcement method for tunnel prefabricated steel arch frame

Abstract

The invention relates to a method for reinforcing and reinforcing a prefabricated steel arch of a tunnel, which comprises the following steps: 1) Obtaining the inner contour information of the lining of the reinforced section of the tunnel by using three-dimensional laser scanning, and making a steel arch accordingly. The steel arch is composed of prefabricated parts 2) On the inner side of the lining, from the foot of the side wall to the arch along the ring direction, the prefabricated steel arch members of each section are combined into a steel arch through bolts; 3) At the foot of the steel arch Install the prestressed anchor so that the anchor penetrates the lining and inserts into the surrounding rock of the tunnel; 4) Fill the gap between the steel arch and the inner side of the lining with non-shrinking mortar or wedges; 5) In order to ensure the longitudinal stability of the steel arch, Install inner struts between multiple steel arches arranged longitudinally along the tunnel; 6) Install a fireproof decorative layer on the inner side of the steel arches. Compared with the prior art, the invention has the advantages of not needing to slot the original lining structure, high strength, fire prevention, fast and convenient, non-destructive reinforcement and the like.

Description

technical field [0001] The invention relates to the technical field of tunnel steel arch reinforcement, in particular to a method for reinforcing a tunnel prefabricated steel arch. Background technique [0002] The existing method of strengthening tunnel steel arch (Chinese patent CN201910560454.7) mainly adopts the method of embedding the old lining, and its basic steps are as follows: [0003] (1) On the inner side of the original lining along the longitudinal direction of the tunnel, circumferential grooves distributed along the circumferential direction of the original lining are provided at certain intervals; [0004] (2) Embedding arc-shaped I-shaped steel arches in the above-mentioned circumferential grooves; [0005] (3) On the inside of the original lining between two adjacent circumferential grooves, a number of horizontal grooves distributed along the longitudinal direction of the tunnel are set up. groove structure; [0006] (4) Embed connecting bars in the lo...

AI Technical Summary

Problems solved by technology

[0011] But the main shortcoming of above-mentioned existing construction method is that the construction process is complicated, firstly need to carry out the destruction (grooving) to a certain degree to the original structure, then repair the damage to the original structure through filling layer, no matter be the process of grooving, or pouring and The process of curing concrete takes a long time, resulting in a long construction period and long-term impact on traffic. After installing the steel arch, it is necessary to spray concrete to fill the grid formed by the arch, which further increases the difficulty and time of construction.

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