Collapse-prevention two-way rib wing jetting grouting drill bit and using method thereof

Abstract

The invention discloses a collapse-prevention two-way rib wing jetting grouting drill bit and a using method thereof. The collapse-prevention two-way rib wing jetting grouting drill bit comprises a drill bit body connected with an outer flat drill rod. A rib wing is arranged on the side face of the drill bit body in the longitudinal direction of the drill bit. The rib wing comprises a forward wing piece, a reverse wing piece and a lateral wing piece, wherein the forward wing piece is arranged at the front end of the drill bit, the reverse wing piece is arranged at the rear end of the drill bit, and the lateral wing piece is connected with the forward wing piece and the reverse wing piece. The included angle formed between the forward wing piece and the lateral wing piece and the included angle formed between the reverse wing piece and the lateral wing piece are obtuse angles. An inner through hole communicated with a through hole in the outer flat drill rod is formed inside the drill bit body. A jetting hole communicated with the inner through hole is formed in the surface of the drill bit body. When the drill bit rotates, vertical movement is achieved through rotation of the forward wing piece and the reverse wing piece, drop pieces of the wall of the hole can be eliminated through cutting of the rib wing or the drop pieces can be extruded into the wall of the hole again, and grouting reinforcement and repairing of the wall of the hole are achieved.

Description

technical field [0001] The invention relates to a two-way rib jet grouting drill bit that does not drill and prevents collapse in a borehole in a loose, weak and broken stratum, and belongs to the field of tunnel and underground engineering drilling and surrounding rock grouting reinforcement in mining, transportation, water conservancy and hydropower. Background technique [0002] At present, in the construction of mines, tunnels and underground projects, unfavorable geological environments that are loose, weak, broken or even rich in water are often encountered. In the treatment of geological disasters, it is necessary to carry out grouting reinforcement of unfavorable geological bodies through grouting drilling. However, in the construction of grouting drilling, the hole wall instability such as hole diameter reduction, hole wall collapse, and block drop in the hole often occur, resulting in drilling accidents such as buried or stuck drilling tools in the hole. In order ...

AI Technical Summary

Problems solved by technology

During the drilling process, the drill bit can only be pushed forward and rotated in the collapsed block hole, but cannot be pulled back; once the hole wall shrinks or falls between the drill pipe and the hole wall above the drill bit, In the event of a drilling tool being jammed accident, due to the lack of upward and side cutting edges, it is difficult for this type of drill to eliminate the shrinkage of the hole wall above the drill bit or collapse and block, and it is difficult to smoothly lift the drilling tool out of the hole

[0005] 2. The nozzles of traditional drill bits are all set at the bottom of the drill bit, and it is difficult to consolidate the hole wall by spraying grouting slurry. Even if the nozzle grouting is performed through the nozzle body on the drill bit, the slurry can only be sprayed towards the bottom of the drill bit, and it is difficult to spray to the side And upper spraying, the spraying is not targeted and uneven, and the effect of spraying reinforcement on loose and broken surrounding rock is poor

[0006] 3. Due to the short setting time of quick-setting slurry, complex operation process and high safety risk, when traditional drilling tools are in use, once accidents such as drill sticking and dropping occur, it is impossible to complete the accident treatment within the initial setting time of the slurry, resulting in The quick-setting slurry solidifies and solidifies the drill bit and the hole wall, causing more difficult engineering accidents

Therefore, quick-setting grout cannot be used during grouting, and the grout with a waiting time of 72 hours is selected, which greatly delays the construction progress

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