Tunnel arch dismounting and replacing auxiliary trolley and construction method thereof

Abstract

The invention discloses a tunnel arch dismounting and replacing auxiliary trolley and a construction method thereof. The tunnel arch dismounting and replacing auxiliary trolley comprises a temporary protection arch, a hydraulic jack A, rubber tires, hydraulic supporting legs, an operation platform, a hydraulic jack B, a horizontal sliding rail, a fixing plug pin and a fixing pedestal. The movable arch changing trolley has the beneficial effects that the movable arch changing trolley is flexible, temporary supporting can be provided, and the size of a temporary supporting steel arch frame can be changed and adjusted within a certain range in the circumferential direction so as to adapt to the change of the tunnel hole diameter. In addition, the distance between the two temporary protection arches can be adjusted front and back in the longitudinal direction of the tunnel so as to adapt to the change of the distance between the tunnel initial supporting steel arches. By means of the movable arch changing trolley, safe and rapid dismounting and replacing of tunnel initial support deformation limit invasion local (vault and side wall) steel arches can be achieved.

Description

technical field [0001] The invention relates to an auxiliary trolley for arch replacement, in particular to an auxiliary trolley for tunnel arch replacement and a construction method thereof, belonging to the technical field of tunnel construction. Background technique [0002] In the construction of mountain tunnels, unfavorable geological areas are often encountered, with developed joints and fissures, soft rock, poor self-stabilization ability, vault sinking, primary support cracking and encroachment and other problems. Especially in the construction of the expansive rock section, the surrounding rock will swell and soften to varying degrees when it encounters water, which will further increase the deformation. In addition, because the buried depth of the tunnel is large, the surrounding rock is subject to a high level of ground stress. During the excavation of the tunnel, with the release of the ground stress, the surrounding rock deforms greatly, resulting in a large st...

AI Technical Summary

Problems solved by technology

[0003] The problem that needs special attention is that when the primary branch encroachment of the tunnel crossing the fault fracture zone with compressive weak surrounding rock needs to be changed, due to the poor surrounding rock conditions and construction environment, the risk factors faced in the process of changing the arch are more complicated and changeable , construction risk is high, difficult, large, low efficiency, and the safety of construction personnel and machinery and equipment will be greatly threatened

[0004] Existing arch replacement technologies aimed at the deformation and limitation of primary supports in mountain tunnel excavation mainly use backfilling in the range where arch replacement is required, or use simple benches to create a working platform for arch replacement, and then perform arch replacement. Arch operation, the existing technology has a large amount of construction work and slow construction progress, which has a great impact on the construction period

In addition, the temporary support used in the existing technology is generally not reusable, and the steel arch frame used for the temporary support needs to be customized according to the site conditions, which is not convenient, and when the temporary support is applied, the on-site staff will face greater risks

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