An anti-collapse two-way rib jet grouting drill bit and its application method

Abstract

The invention discloses an anti-collapse bidirectional rib jet grouting drill bit and a method of using the same. The anti-collapse bidirectional rib jet grouting drill bit comprises a drill bit body connected with an outer flat drill pipe, and the side surface of the drill bit body is provided with a longitudinal direction of the drill bit. A rib wing, the rib wing includes a forward fin provided at the front end of the drill bit, a reverse fin provided at the rear end of the drill bit, and a side fin connecting the forward fin and the reverse fin , the included angles of the forward fins and the reverse fins and the side fins are all obtuse angles; the inside of the drill bit body is provided with an inner through hole that communicates with the through hole of the outer flat drill rod, so The surface of the drill bit body is provided with a jet hole that communicates with the inner through hole; when the drill bit rotates, the forward fin and the reverse fin are rotated to realize the up and down movement, and the rib cutting eliminates the hole wall drop or Re-extrude the dropped block into the hole wall to realize grouting reinforcement and repair of the hole wall.

Description

technical field [0001] The invention relates to a non-lifting anti-collapse two-way rib jet grouting drill bit in a borehole in a loose, weak and broken stratum, belonging to the fields of tunnel and underground engineering drilling and surrounding rock grouting reinforcement in mines, transportation, water conservancy and hydropower. Background technique [0002] At present, in the construction of mines, tunnels and underground projects, we often encounter unfavorable geological environments that are loose, weak, broken, or even rich in water, and surrounding rock deformation, collapse, and even geological disasters such as water and mud inrush often occur. In the treatment of geological disasters, grouting reinforcement must be carried out on unfavorable geological bodies through grouting drilling. However, in the construction of grouting drilling, borehole diameter shrinkage, hole wall collapse, and hole wall instability such as block falling in the hole often occur, caus...

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

Images