CN-121976833-A - Porous compression type underground grouting anchor rod suitable for multi-fracture rock stratum and method thereof

CN121976833ACN 121976833 ACN121976833 ACN 121976833ACN-121976833-A

Abstract

The invention belongs to the technical field of grouting support and discloses a multi-slit stratum porous compression type underground grouting anchor rod and a method thereof, wherein the anchor rod comprises a hollow grouting anchor rod, an anchor head fixing piece and an anchor tail fixing piece which are respectively arranged at two ends of the grouting anchor rod, a plurality of grouting holes are formed in the grouting anchor rod along the length direction of the grouting anchor rod, the grouting assembly comprises a grouting rod, the grouting rod is a hollow grouting rod, the grouting rod penetrates into a hollow cavity of the grouting anchor rod along the axial direction of the grouting anchor rod, one end of the grouting rod extends to a region close to the anchor head fixing piece, and the free end of the grouting rod extends out of the end part of the anchor tail fixing piece; according to the scheme, the grouting rod is extended to the lower area of the anchor hole close to the anchor head fixing piece, so that slurry is filled at the bottom of the anchor hole first, cavity and bubble residues are reduced, the problem that slurry is not full when grouting is conducted through the multi-overflow holes of the existing grouting anchor rod is solved, and the grouting rod is suitable for grouting support of multi-fracture rock stratum.

Inventors

CHENG XINGHAI
GUO YANSONG
XU SHENGYUAN
LEI XU
DU JIAXIN
Gallehassen Kusai Khan
WANG JIANFA
QIN YI
SUN LIPING
LIN YONG

Assignees

新疆哈巴河阿舍勒铜业股份有限公司

Dates

Publication Date: 20260505
Application Date: 20260331

Claims (10)

1. The utility model provides a be applicable to multi-slit stratum porous compression formula underground grouting anchor, includes hollow grouting anchor (1) and locates anchor head mounting (2) and anchor tail mounting (3) at grouting anchor (1) both ends respectively, grouting anchor (1) are equipped with a plurality of grout overflows (11) along its length direction, its characterized in that still includes slip casting subassembly (4), slip casting subassembly (4) include: The grouting rod (41), grouting rod (41) are hollow grouting rod (41), grouting rod (41) are worn to locate in the cavity of grouting stock (1) along the axis direction of grouting stock (1), the one end of grouting rod (41) extends to the region that is close to anchor head mounting (2), and the free end extends outside the tip of anchor tail mounting (3).
2. The multi-fracture stratum porous compression type underground grouting anchor rod suitable for the multi-fracture stratum is characterized in that a spiral external thread (12) is arranged on the outer wall of the grouting anchor rod (1) along the length direction of the grouting anchor rod, and the grouting holes (11) penetrate through the spiral external thread (12) and are communicated with a hollow cavity of the grouting anchor rod (1).
3. The multi-fracture stratum porous compression type downhole grouting anchor rod disclosed by claim 1, further comprising a cleaning assembly (5), wherein the cleaning assembly (5) comprises a fan blade (51) and a sleeve (52), a rotating shaft of the fan blade (51) is in threaded connection with the outer wall of the grouting anchor rod (1), the sleeve (52) is coaxially arranged in a rotating mode with the fan blade (51), the fan blade (51) is used for cleaning a grouting hole (11), and the downhole grouting anchor rod further comprises a driving assembly (6) used for driving the fan blade (51) to circumferentially rotate along the length direction of the grouting anchor rod (1).
4. The multi-fracture stratum porous compression type underground grouting anchor rod suitable for the multi-fracture stratum is characterized in that the driving assembly (6) comprises a floating plate (61), the floating plate (61) is arranged between the fan blades (51) and the anchor head fixing piece (2), the floating plate (61) is fixedly connected with the fan blades (51) in a coaxial mode, the floating plate (61) is matched with grout, and the grout is used for driving the floating plate (61) to move along the length direction of the grouting anchor rod (1) so as to drive the fan blades (51) to circumferentially rotate along the length direction of the grouting anchor rod (1).
5. The multi-fracture stratum porous compression type underground grouting anchor rod suitable for the multi-fracture stratum is characterized in that one end, close to the anchor head fixing piece (2), of the floating plate (61) is coaxially and fixedly connected with a stirring blade (62), and the stirring blade (62) is used for stirring slurry.
6. The multi-fracture stratum porous compression type underground grouting anchor rod suitable for the multi-fracture stratum porous compression type underground grouting anchor rod is characterized in that the driving assembly (6) comprises an impeller (63) and a sliding block (64), the impeller (63) is fixedly connected with a grouting outlet of the grouting anchor rod (41) in a coaxial mode, a grouting opening (631) is formed in the side wall of a rotating shaft of the impeller (63), the grouting opening (631) is communicated with a hollow cavity of the grouting anchor rod (41), external threads are formed in the outer wall of the grouting anchor rod (41), the sliding block (64) is connected with the outer wall of the grouting anchor rod (41) in a threaded mode, the outer wall of the sliding block (64) is connected with the inner wall of the grouting anchor rod (1) in a sliding mode, the sleeve (52) is a ferromagnetic sleeve (52), and the sliding block (64) is a magnetic sliding block (64) and is used for attracting the sleeve (52).
7. The multi-fracture stratum porous compression type downhole grouting anchor rod suitable for the multi-fracture stratum is characterized in that the sliding block (64) is provided with a sliding groove (641), a poking needle (65) for cleaning a grouting hole (11) is arranged in the sliding groove (641), the poking needle (65) is connected with a pressure spring (651), and the free end of the pressure spring (651) is fixedly connected with the sliding groove (641).
8. A method of porous compression downhole grouting for use in a multi-fracture formation comprising the application of a porous compression downhole grouting bolt for use in a multi-fracture formation as claimed in any one of claims 1 to 7, comprising the steps of: S10, placing the grouting anchor rod into an anchor hole, centering the grouting anchor rod, fixing the front end of the grouting anchor rod through an anchor head fixing piece, and fixing the rear end of the grouting anchor rod through an anchor tail fixing piece; Step S20, penetrating a grouting rod into the inner cavity of the grouting rod along the axis of the grouting rod, enabling one end of the grouting rod to extend to a region close to the anchor head fixing piece, locking the axial position of the grouting rod, and then enabling the free end of the grouting rod extending out of the anchor tail fixing piece to be in sealing connection with an external grouting device; Step S30, starting an external grouting device, conveying slurry to a region close to an anchor head fixing piece through a grouting rod, flowing in the anchor tail direction, driving a fan blade to circumferentially rotate along the length direction of the grouting anchor rod through a driving assembly, cleaning a slurry overflow hole, and stirring the slurry; and S40, when the grouting pressure reaches the limit, grouting is continuously performed until the grouting liquid uniformly overflows from a liquid inlet of the grouting rod and has no bubbles, the grouting device is closed, the support is completed after the grouting liquid is solidified, and the sealing plug is screwed into the tail part of the grouting rod.
9. The method of multi-slit rock stratum porous compression type downhole grouting according to claim 8, wherein in step S30, thrust generated by slurry flow drives a floating plate to move towards an anchor tail along the length direction of a grouting anchor rod, the floating plate drives a fan blade to synchronously move, the fan blade is driven to circumferentially rotate, generated air flow is used for cleaning a slurry overflow hole, and meanwhile a stirring blade is driven to rotate to stir the slurry surface layer to improve fluidity.
10. The method of multi-slit rock stratum porous compression type downhole grouting method of claim 8, wherein in step S30, slurry flows to a slurry spraying port of an impeller through a grouting rod to be sprayed out, the impeller is driven to coaxially rotate, the grouting rod is driven to rotate, the sliding block is driven to axially move along the inner wall of the grouting anchor rod, the poking needles are aligned one by one and are inserted into each slurry overflow hole under the action of the pre-tightening force of a pressure spring, and the fan blade is driven to rotate to generate air flow to assist cleaning of the slurry overflow holes.

Description

Porous compression type underground grouting anchor rod suitable for multi-fracture rock stratum and method thereof Technical Field The scheme belongs to the technical field of grouting support, and particularly relates to a porous compression type underground grouting anchor rod suitable for multi-fracture strata and a method thereof. Background In underground mining engineering, multi-fracture rock formations are affected by geological structure movement (such as fault movement and rock formation extrusion) and mine early-stage blasting disturbance, so that complex rock formations with multi-directional and penetrable fractures densely distributed inside are formed. Compared with general rock formations with better integrity (such as complete limestone and sandstone), the uniaxial compressive strength of the multi-fracture rock formation is only 30% -60% of that of the complete rock formation, the multi-fracture rock formation has obvious heterogeneity (different area strength and large permeability difference), and once external loads (such as roof pressure and excavation unloading counterforce) brought by underground exploitation are born, internal cracks are extremely easy to rapidly expand and penetrate, and finally the rock body is unstable. Because working spaces such as a roadway, a stope and the like need to be excavated in underground mining, after excavation and unloading are carried out on multi-fracture rock stratum, fragile through cracks in the original rock mass can be expanded in a short time, and then a series of safety risks are caused. The grouting operation can inject cement base into the anchor holes and surrounding rock cracks, the crack space can be filled after the slurry is solidified, loose rock scraps are glued, meanwhile, the anchor rod penetrates into a stable rock stratum, active supporting force is provided for the rock mass after grouting, deformation trend of the rock mass is restrained, and safe propulsion of underground mine exploitation operation is guaranteed. Referring to the prior publication (bulletin) No. CN113107560A, a broken coal roadway reinforced anchoring type yielding grouting anchor device and a use method thereof are disclosed, and the device comprises a hollow grouting anchor, wherein the tail part of the hollow grouting anchor is provided with a resistance-increasing pawl sleeve, the slurry passing through the hollow grouting anchor is positioned at the orifice section of an anchor hole, a constant resistance yielding structure is matched with the hollow grouting anchor, and the constant resistance yielding structure comprises an elastic yielding assembly and a plastic yielding assembly which are axially overlapped and penetrated; the rod body of the hollow grouting anchor rod is provided with a plurality of grouting holes. For example, although grouting is performed by arranging a plurality of grouting holes along the length direction of the anchor rod body so as to improve grouting range and efficiency, grout can flow out of the grouting holes at the orifice section nearer to the grouting hole preferentially under the influence of flow resistance difference during grouting, but is not discharged from the lower grouting holes in the sequence from the bottom of the anchor hole to the orifice, so that air at the lower part of the anchor hole (especially in the bottom area) is difficult to be discharged along with the pushing of the grout, a large amount of air is blocked in holes and cracks at the bottom of the hole to form bubbles or cavities, and the grout is difficult to fully reach the holes and cracks at the bottom of the hole to cause the filling of the grout at the anchoring section at the bottom of the hole to be not full, so that the bonding strength between the lower part of the anchor rod and the rock body is obviously insufficient, and stable and reliable support cannot be formed on complex strata such as broken coal roadway. Disclosure of Invention The purpose of this scheme is to provide a be applicable to multi-slit stratum porous compression formula underground grouting stock to solve the not full problem of thick liquid when current grouting stock multi-overflow thick liquid hole slip casting. In order to achieve the above-mentioned purpose, this scheme provides a porous compression formula underground grouting stock suitable for many fissures stratum, including hollow grouting stock and locate anchor head mounting and the anchor tail mounting at grouting stock both ends respectively, grouting stock is equipped with a plurality of grout overflows along its length direction, still includes the slip casting subassembly, the slip casting subassembly includes: The grouting rod is hollow, the grouting rod penetrates through the hollow cavity of the grouting anchor rod along the axis direction of the grouting anchor rod, one end of the grouting rod extends to a region close to the anchor head fixing piece, and the free end of the grouting rod e