Wing plate type advanced small pipe used for advance support of soft broken surrounding rock tunnel

Abstract

The invention discloses a wing plate advanced small pipe used for advance support of a soft broken surrounding rock tunnel, which comprises small pipes with grouting holes, and both sides of each small pipe are provided with wing plates. The small pipes are pressed into the front broken surrounding rocks at certain inclination angle through a jack or a drill, and the small pipes are buckled together to form a curtain structure during pressing. Slurry is injected into the small pipes, the slurry flows into slots in the wing plates through holes on the pipe walls and is injected into the front surrounding rock cracks along the slots, so that the broken rock bodies are connected into a whole, and the stability of the surrounding rocks is maintained. The wing plate advanced small pipe has easiness in maintenance, high slurry utilization rate and high load bearing, the advance support of loose broken surrounding rocks is truly realized, and the collapse rate of surrounding rocks of a tunnel is greatly reduced. The wing plate advanced small pipe can be machined outside the site and then transported to the site, so that time and labor are saved. Meanwhile, the plate insertion method and the ordinary advanced small pipe are combined to form the wing plate advanced small pipe, so that sufficient supporting counter force can be implemented to the surrounding rocks.

Description

[0001] technical field [0002] The invention relates to an advanced small conduit structure of an airfoil plate used for the advanced support of tunnels with weak and broken surrounding rocks. Background technique [0003] At present, in order to prevent the surrounding rock from collapsing in the construction of existing weak and broken surrounding rock tunnels, advance support measures are often adopted. The advance support generally adopts the support method of advance small conduits, that is, the top of the tunnel face is drilled at a certain inclination angle. Small catheter and grout. However, in the actual tunnel construction, due to the insufficient supporting reaction force of the leading small conduit or the insufficient diffusion of the grout, the support strength in front of the tunnel face is insufficient, and there are potential safety hazards; Increasing the grouting pressure makes it difficult to fully diffuse the grout, so that it cannot exert its due effe...

AI Technical Summary

Problems solved by technology

However, in the actual tunnel construction, due to the insufficient supporting reaction force of the leading small conduit or the insufficient diffusion of the grout, the support strength in front of the tunnel face is insufficient, and there are potential safety hazards; Increasing the grouting pressure makes it difficult to fully diffuse the grout, so that it cannot exert its due effect; in addition, in order to improve the support reaction force, it is necessary to arrange the small conduits closely, which increases the number of small conduits and makes the labor intensity High, low construction efficiency

Therefore, the traditional support method will have a bad influence on the construction progress and construction effect and has certain safety hazards.

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