Prestressed drilling, anchoring and grouting anchor cable and support method

Abstract

Disclosed are a prestressed drilling, anchoring and grouting anchor cable and a support method. The prestressed drilling, anchoring and grouting anchor cable comprises a hollow grouting anchor cable, a sleeve, a lock, a washer and a tray, the hollow grouting anchor cable is provided with a sleeve head, a drill bit is arranged at the front end of the sleeve, and the sleeve is provided with an anchoring hole and a thread. The hollow grouting anchor cable drives the sleeve to drill holes and advances inwards through the thread in reverse rotation, a metal nail at the front end of the sleeve head punctures an anchoring agent package inside the sleeve, anchoring agents are mixed and then discharged through the anchoring hole in the sleeve, the gap between the sleeve and a drill hole wall is filled with the anchoring agents, and the anchoring function is achieved. An exhaust pipe is arranged in the anchor cable, the anchor cable is provided with a plurality of lantern-shaped grouting sections, and grout vent holes are formed in the lantern-shaped grouting sections. The prestressed drilling, anchoring and grouting anchor cable integrates drilling, exhausting, grouting and anchoring, the tail of the grouting anchor cable is firstly tensioned and fastened, grouting is then performed, an anchored body becomes reinforced pre-tightening force concrete, loose coal rocks are drilled, anchored, grouted and supported once, the problem that the anchor cable does not easily enter drilled holes in the loose coal rocks due to sticking and hole collapse is solved, the support strength of surrounding rocks of a roadway is enhanced, and the carrying capacity of a rock mass is improved. The prestressed drilling, anchoring and grouting anchor cable is simple in structure, low in cost, easy in construction and fine in support effect.

Description

technical field [0001] The invention relates to a prestressed drilling, anchoring, anchoring cable and supporting method, especially suitable for drilling and anchoring of loose and broken surrounding rocks, extremely soft rock formations, high-stress broken surrounding rocks, and large buried deep coal roadways in mines, tunnels and underground engineering Note support. Background technique [0002] Anchor cable support has the characteristics of large anchoring radius, strong anchoring force, and wide reinforcement range. plays an important role in. Anchor cable support is to install anchor cables in the surrounding rock to form an anchor body to strengthen the surrounding rock and improve the bearing capacity of the surrounding rock. Usually anchor cable support needs to carry out long-distance and ultra-long-distance support and drill deep holes to install anchor cables. During the construction of anchor cable drilling, due to loose surrounding rock, broken, high stre...

AI Technical Summary

Problems solved by technology

Usually anchor cable support needs to carry out long-distance and ultra-long-distance support and drill deep holes to install anchor cables. During the anchor cable drilling construction, due to the loose, broken and high stress of the surrounding rock, it is easy to cause the hole to collapse after the drilling shutdown, which makes the anchor cable unable to be installed.

In view of this situation, anchoring and grouting support technology is more commonly used at present. The drilling, anchoring, grouting and other processes are carried out separately, and the construction is cumbersome.

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