Tunnel arch frame with elastic grouting bags and mounting method thereof

Abstract

The invention discloses a tunnel arch frame with elastic grouting bags and a mounting method thereof. The grouting bags are arranged on the face, making contact with surrounding rock, of the arch frame and made of flexible elastic materials; the grouting bags are bonded to the reverse side of the arch frame through glue; and after the arch frame is mounted, slurry is injected into the grouting bags, the grouting bags are expanded, gaps between the arch frame and the irregular surrounding rock are full of the grouting bags, and after the slurry is solidified, the arch frame and the surroundingrock are tightly attached. Compared with the prior art, the advantages of high bearing capacity, even stress, low cost, high construction speed, easy operation, safety and the like of the arch frame can be given into full play, and the tunnel arch frame can be widely suitable for various drill-blasting method tunnel construction.

Description

technical field [0001] The invention belongs to the field of drilling and blasting construction in tunnel engineering, and relates to a tunnel arch with elastic grouting bags and an installation method thereof. Background technique [0002] The arch frame is one of the most important supporting components in the tunnel excavation process by the drill and blast method, and plays an important role in the stability of the tunnel and the personal safety of the construction personnel. However, no matter how careful the excavation is, the excavation surface is uneven, and it is difficult for the arch frame to be in close and comprehensive direct contact with the surrounding rock, and even if there is contact, it is partial; It is not close to the surrounding rock, and there is a partial or complete suspension state. In this case, most of the arches are subjected to local concentrated loads or bias loads, and at this time the arches are easily deformed (easy to bend or yield). Fo...

AI Technical Summary

Problems solved by technology

The "Technical Guidelines for Railway Tunnel Engineering Construction" stipulates: "Wedge with steel wedges or prefabricated concrete blocks every 2 meters along the outer edge of the arch frame", but due to the uneven surface of the surrounding rock, there are no rules to follow, and each arch frame The size of the required wedges is different, and the manufacturing cost is very high; after the arch is erected, the wedges are driven into the gap between the arch and the surrounding rock, which is labor-intensive, and the vibration force of the impact may shake down into the surrounding rock The small stones threaten the safety of construction workers, so in actual engineering, the arch frame and the surrounding rock are not in close contact at all.

Images