Hollow grouting anchor cable
By introducing the design of the capsule bag and blasting valve into the grouting anchor cable, the problems of insufficient grouting pressure and slurry loss are solved, the anchoring force and slurry utilization are significantly improved, and the scope of application is expanded.
Patent Information
- Application Number
- CN202411542872.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-31
- Publication Date
- 2025-02-18
AI Technical Summary
When the slurry injection amount is limited, the existing grouting anchor cable is not sufficient to achieve the ideal state due to the insufficient sealing property between the anchor rod and the hole wall, which affects the anchoring force, and the slurry loss during the grouting process is relatively Generally, the utilization rate of materials is reduced.
A hollow grouting anchor cable is designed, including anchor rods, grouting tubes, blasting valves and bags of flexible materials. The anchor rod uses the anchor to closely contact the rock mass, and the pressure slurry is injected into the grouting pipe, the capsule opens the gap between the solid rock mass, and the blasting valve controls the slurry to flow out, further enhancing the anchoring force.
By increasing the grouting pressure and reducing slurry loss, the anchoring force is enhanced, the utilization rate of the slurry is improved, and the scope of application is expanded.
Smart Images
Figure CN119466909A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of grouting anchor cables, and in particular discloses a hollow grouting anchor cable. Background Art
[0002] Full-length bonded anchor cables are a type of support technology widely used in civil engineering, especially in geotechnical engineering, where they are used to reinforce unstable rock walls or wall structures. This type of anchor cable injects grout into the rock mass or wall to form an anchoring effect, thereby enhancing the stability and bearing capacity of the structure.
[0003] Existing grouting anchor cables are mainly composed of hollow anchor rods, anchor heads, stop plugs, pads and nuts. These components cooperate with each other to complete the task of grouting reinforcement. The hollow anchor rod is used as the channel for grouting and the main part of reinforcement, and several grout outlets are set on its outer wall. The anchor head is used to fix and center the anchor rod and generate a certain anchoring force in the rock anchor hole. The stop plug has the function of grouting exhaust and sealing, ensuring that the grouting slurry can fill the borehole and achieve the expected reinforcement effect. The pad and nut are mainly used to apply pre-tightening force to make the anchor rod in close contact with the rock mass.
[0004] In the above-mentioned prior art, under the premise of limited slurry injection volume, the grouting pressure is difficult to reach an ideal state due to insufficient sealing between the anchor rod and the hole wall, thereby affecting the formation of an integral structure between the anchor rod and the surrounding rock and affecting the anchoring force. At the same time, the loss of slurry during the grouting process is also relatively common, which not only reduces the utilization rate of grouting materials, but also may have an adverse impact on the surrounding environment. Summary of the invention
[0005] In view of the above-mentioned deficiencies of the prior art, the present invention provides a hollow grouting anchor cable to solve the problem that the grouting pressure is difficult to reach an ideal state due to insufficient sealing between the anchor rod and the hole wall under the premise of limited slurry injection, thereby affecting the formation of an integral structure between the anchor rod and the surrounding rock and affecting the anchoring force. At the same time, the loss of slurry during the grouting process is also relatively common, which reduces the utilization rate of the grouting material.
[0006] To achieve the above object, the technical solution of the present invention is: A hollow grouting anchor cable comprises a hollow anchor rod, an anchor device is arranged at one end of the anchor rod, a grouting pipe is arranged inside the anchor rod; a bursting valve is arranged at one end of the anchor rod away from the anchor device; a grouting outlet 1 and a grouting outlet 2 are arranged on the grouting pipe; the grouting outlet 1 is arranged in the bursting valve; the grouting outlet 2 is arranged in a bag made of flexible material; the bag is fixedly arranged on the anchor rod and arranged near one end of the anchor device; the maximum pressure of the bag is greater than the maximum pressure of the bursting valve. The anchor rod uses the anchor device to make the anchor rod in close contact with the rock mass, and a slurry with a certain pressure is injected into the grouting pipe. The slurry expands the bag to occupy a larger volume, fills the gap between the bag and the rock mass, and increases the anchoring force; at the same time, the grouting slurry pressure is greater than the maximum pressure of the bursting valve and less than the maximum pressure of the bag. At this time, the bursting valve bursts open, and the slurry flows out to fill the gap between the anchor rod and the rock mass, further increasing the anchoring force of the anchor rod. In this process, while ensuring the grouting pressure, the amount of slurry used is reduced, the loss of slurry is reduced, the anchoring force is increased, the utilization rate of the slurry is improved, and the scope of application is expanded.
[0007] Preferably, an accelerating setting agent is placed in the bag to ensure that the slurry solidifies quickly in the bag and avoid the bag being cracked due to excessive grouting pressure.
[0008] Preferably, the grouting pipe is coaxially arranged with the anchor rod; the first grouting outlet and the second grouting outlet are both arranged radially along the grouting pipe; a grouting nozzle is arranged at the end of the anchor rod; a through hole is arranged in the middle of the grouting nozzle; and the grouting pipe is connected to the through hole of the grouting nozzle. The arrangement of the grouting nozzle facilitates the external pipeline to pass the slurry into the grouting pipe.
[0009] Preferably, the bag includes two buckling rings fixedly arranged on the anchor rod; the two buckling rings are arranged at intervals and parallel to each other; the buckling rings are fixedly arranged on the anchor rod; the grouting pipe passes through the buckling rings, and the grouting pipe is fixedly connected to the buckling rings; a bag body is arranged between the two buckling rings; the bag body is sleeved outside the grouting pipe, and the upper and lower ends of the bag body are fixedly arranged on the buckling rings; the quick-setting agent is placed in the bag body and between the two buckling rings. The fixed arrangement of the buckling ring on the anchor rod ensures the spacing between the two buckling rings, the volume of the bag body, the contact area between the slurry in the bag body and the rock mass after solidification, and improves the anchoring force.
[0010] Preferably, the outer diameter of the clamping ring is larger than the outer diameter of the anchor rod; the second grout outlet is set in the middle of the bag; the bag body is in a tubular shape with upper and lower ends open. The outer diameter of the clamping ring is larger than the outer diameter of the anchor rod, ensuring that when the hollow grouting anchor cable is inserted into the drill hole in the rock body, the wear of the bag body by the rock body is reduced.
[0011] Preferably, the bursting valve is in a tubular shape with closed upper and lower ends; the bursting valve is coaxially arranged with the anchor rod; both ends of the bursting valve are fixedly arranged on the anchor rod; the grouting pipe passes through the bursting valve and is fixedly arranged on the inner bottom surface of the anchor rod; a grouting outlet is arranged on the grouting pipe in the middle of the bursting valve.
[0012] Preferably, the outer diameter of the burst valve is equal to the outer diameter of the anchor rod, so as to facilitate the insertion of the hollow grouting anchor cable into the drilled hole of the rock mass.
[0013] Preferably, the anchor comprises an anchor plate and a locking member; the anchor rod is arranged through the anchor plate; the locking member is threadedly arranged on the anchor rod. The locking member presses the anchor plate against the rock mass to fix the anchor rod.
[0014] Preferably, a gap is provided between the anchor plate and the outer wall of the anchor rod; and a convex surface is provided in the middle of the anchor plate.
[0015] Preferably, the locking member comprises a locking nut; the locking nut is threadedly arranged on the anchor rod; a wedge is arranged on the outer sleeve of the locking nut; the locking nut and the wedge are wedge-fitted; the wedge is arranged between the locking nut and the anchor plate. The arrangement of the wedge increases the contact area between the locking nut and the anchor plate, ensures that the anchor plate is pressed against the rock mass, and ensures the anchoring force of the anchor rod.
[0016] The beneficial effects of the present invention are as follows: the anchor rod uses the anchor to make the anchor rod and the rock mass in close contact, and a certain pressure of slurry is injected into the grouting pipe, and the slurry expands the bag to occupy a larger volume, fills the gap between the bag and the rock mass, and increases the anchoring force; at the same time, the grouting slurry pressure is greater than the maximum pressure of the bursting valve and less than the maximum pressure of the bag. At this time, the bursting valve explodes, and the slurry flows out to fill the gap between the anchor rod and the rock mass, further increasing the anchoring force of the anchor rod. In this process, while ensuring the grouting pressure, the amount of slurry used is reduced, the loss of slurry is reduced, the anchoring force is increased, the utilization rate of slurry is improved, and the scope of application is increased. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.
[0018] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 for Figure 1 The enlarged schematic diagram of point A in the middle; Figure 3 for Figure 1 A magnified schematic diagram of point B in the middle.
[0019] Description of reference numerals: 1-anchor rod, 2-anchor, 3-grouting pipe, 4-burst valve, 5-slurry outlet 1, 6-slurry outlet 2, 7-bladder bag, 8-accelerator, 9-grouting nozzle, 10-rock mass; 201-anchor plate, 202-locking nut, 203-wedge block; 701-buckle ring, 702-bag body. DETAILED DESCRIPTION
[0020] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.
[0021] like Figure 1-3 As shown, a hollow grouting anchor cable comprises a hollow anchor rod 1, one end of which is arranged in a borehole of a rock mass 10 through an anchor 2, and the anchor 2 comprises an anchor plate 201 and a locking member; a through hole is arranged in the middle of the anchor plate 201, and the anchor rod 1 is inserted into the borehole of the rock mass 10 after passing through the through hole, and the inner diameter of the through hole is larger than the outer diameter of the anchor rod 1; the locking member is threadedly arranged on the anchor rod 1, and the locking member is screwed into the thread of the anchor rod 1, so that the anchor plate 201 is pressed against the rock mass 10 to fix the anchor rod 1. A convex surface is arranged in the middle of the anchor plate 201. The locking member includes a locking nut 202; the locking nut 202 is threadedly arranged on the anchor rod 1; a wedge 203 is arranged on the outer sleeve of the locking nut 202; the locking nut 202 is arranged in a truncated cone shape as a whole, with the small diameter end facing the anchor plate 201, and a clearance groove is arranged in the wedge 203, and the cross section of the clearance groove is arranged in a regular trapezoidal shape to complete the wedge-shaped fit between the locking nut 202 and the wedge 203; the wedge 203 is arranged between the locking nut 202 and the anchor plate 201. The arrangement of the wedge 203 increases the contact area between the locking nut 202 and the anchor plate 201, ensures that the anchor plate 201 is pressed against the rock mass 10, and ensures the anchoring force of the anchor rod 1. A grouting pipe 3 is coaxially arranged in the anchor rod 1; the anchor rod 1 is arranged in a cylindrical shape with an opening at the lower end as a whole; a grouting nozzle 9 is arranged at the open end of the lower end of the anchor rod 1; a through hole is arranged in the middle of the grouting nozzle 9; and the grouting pipe 3 is connected to the through hole of the grouting nozzle 9. There is an interference fit between the outer wall of the grouting pipe 3 and the through hole of the grouting nozzle 9; the grouting nozzle 9 is provided with an external thread, and the lower open end of the anchor rod 1 is provided with an internal thread. The grouting nozzle 9 is threadedly arranged on the anchor rod 1, which is convenient for the external pipeline of the grouting nozzle 9 to pass the slurry into the grouting pipe 3.
[0022] In other alternative embodiments, the anchor plate 201 is arranged in a disc shape, and the anchor rod 1 is inserted into the borehole of the rock mass 10 through the through hole in the middle of the anchor plate 201. The locking member is a nut, which is screwed into the thread of the anchor rod 1 to press the anchor plate 201 against the rock mass 10.
[0023] In the above arrangement, a bag 7 made of flexible material is fixedly provided on the anchor rod 1, and the bag 7 is arranged near one end of the anchor 2; a grouting pipe 3 is radially provided with a slurry outlet 6, and the slurry outlet 6 is arranged in the bag 7 and in the middle of the bag 7; an accelerator 8 is placed in the bag 7. The bag 7 includes two buckling rings 701 fixedly set on the anchor rod 1, and the buckling rings 701 are welded to the outer wall of the anchor rod 1; the two buckling rings 701 are arranged at intervals and parallel to each other; the buckling rings 701 are fixedly set on the anchor rod 1; the grouting pipe 3 passes through the buckling rings 701, and the grouting pipe 3 and the buckling rings 701 are welded and fixed, and a bag body 702 is arranged between the two buckling rings 701, which ensures the spacing between the two buckling rings 701, the volume of the bag body 702, and the contact area between the slurry in the bag body 702 and the rock mass 10 after solidification, thereby improving the anchoring force; the bag body 702 is sleeved outside the grouting pipe 3, and the upper and lower ends of the bag body 702 are glued or fixed to the buckling rings 701 by bolts, and the bag body 702 is arranged in a tubular shape with upper and lower ends opened. The quick-setting agent 8 is placed in the bag body 702 and placed between the two buckling rings 701.
[0024] In order to reduce the wear of the bag body 702 by the rock mass 10 when the hollow grouting anchor cable is inserted into the borehole in the rock mass 10 , the outer diameter of the retaining ring 701 is larger than the outer diameter of the anchor rod 1 .
[0025] The end of the anchor rod 1 away from the anchor 2 is provided with a bursting valve 4; the grouting pipe 3 is provided with a grouting outlet 5 in the radial direction, and the grouting outlet 5 is arranged in the bursting valve 4. The bursting valve 4 is arranged in a tubular shape with closed ends at the upper and lower ends; the bursting valve 4 is arranged coaxially with the anchor rod 1; both ends of the bursting valve 4 are welded or threaded on the anchor rod 1; the grouting pipe 3 penetrates the bursting valve 4 and is fixedly arranged on the inner bottom surface of the anchor rod 1; the grouting outlet 5 is arranged on the grouting pipe 3 in the middle of the bursting valve 4. The outer diameter of the bursting valve 4 is equal to the outer diameter of the anchor rod 1, which facilitates the insertion of the hollow grouting anchor cable into the drilled hole of the rock mass 10.
[0026] When in use, a borehole is drilled in the rock mass 10 in advance, the hollow grouting anchor cable is inserted into the borehole, the anchor plate 201 is pressed against the rock mass 10 by a locking piece, and slurry of a certain pressure is injected into the grouting pipe 3 by a grouting nozzle 9. The slurry pressure is less than the maximum bearing pressure of the bag 7 and greater than the maximum bearing pressure of the bursting valve 4. The slurry expands the bag 7 to occupy a larger volume. During this process, the slurry reacts with the quick-setting agent 8 in the bag 7 to quickly solidify, thereby preventing the bag from being cracked due to excessive grouting pressure. The expanded bag 7 fills the gap between the bag 7 and the rock mass 10, thereby increasing the anchoring force. At the same time, the grouting slurry pressure is greater than the maximum bearing pressure of the bursting valve 4 and less than the maximum bearing pressure of the bag 7. At this time, the bursting valve 4 explodes, and the slurry flows out to fill the gap between the anchor rod 1 and the rock mass 10, thereby further increasing the anchoring force of the anchor rod 1. In this process, while ensuring the grouting pressure, the amount of slurry used is reduced, the loss of slurry is reduced, the anchoring force is increased, the utilization rate of the slurry is improved, and the scope of application is expanded.
[0027] In a specific implementation, after the bursting valve 4 explodes, the grouting pipe 3 is still used to inject slurry, and more slurry is filled at the upper end of the anchor rod 1 and solidified to form a solidified material with a volume larger than that at the bag 7, which can increase the scope of application. For example, in a construction environment with a rock layer on the surface and a sand layer or a goaf layer inside, the bag 7 is set in the rock layer and the bursting valve 4 is set in the sand layer or the goaf, which can increase the anchoring force of the anchor rod 1.
[0028] Although the present invention has been described in detail by referring to the accompanying drawings and in combination with the preferred embodiments, the present invention is not limited thereto. Without departing from the spirit and essence of the present invention, a person of ordinary skill in the art may make various equivalent modifications or substitutions to the embodiments of the present invention, and these modifications or substitutions shall be within the scope of the present invention. Any person of ordinary skill in the art may easily think of changes or substitutions within the technical scope disclosed by the present invention, and these shall be within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of protection of the claims.
Claims
1. A hollow grouting anchor cable, comprising a hollow anchor rod (1), one end of which is provided with an anchor (2), characterized in that: A grouting pipe (3) is arranged in the anchor rod (1); a bursting valve (4) is arranged at one end of the anchor rod (1) away from the anchor (2); a grouting outlet (5) and a grouting outlet (6) are arranged on the grouting pipe (3); the grouting outlet (5) is arranged in the bursting valve (4); the grouting outlet (6) is arranged in a bag (7) made of a flexible material; the bag (7) is fixedly arranged on the anchor rod (1) and arranged at one end close to the anchor (2); the maximum bearing pressure of the bag (7) is greater than the maximum bearing pressure of the bursting valve (4).
2. The hollow grouting anchor cable according to claim 1, characterized in that: An accelerating setting agent (8) is placed in the bag (7).
3. The hollow grouting anchor cable according to claim 2, characterized in that: The grouting pipe (3) is coaxially arranged with the anchor rod (1); the first grouting outlet (5) and the second grouting outlet (6) are both arranged radially along the grouting pipe (3); a grouting nozzle (9) is arranged at the end of the anchor rod (1); a through hole is arranged in the middle of the grouting nozzle (9); and the grouting pipe (3) is connected to the through hole of the grouting nozzle (9).
4. The hollow grouting anchor cable according to claim 3, characterized in that: The bag (7) comprises two buckling rings (701) fixedly arranged on the anchor rod (1); the two buckling rings (701) are arranged at intervals and parallel to each other; the buckling ring (701) is fixedly arranged on the anchor rod (1); the grouting pipe (3) passes through the buckling ring (701), and the grouting pipe (3) and the buckling ring (701) are fixedly connected; a bag body (702) is arranged between the two buckling rings (701); the bag body (702) is sleeved outside the grouting pipe (3), and the upper and lower ends of the bag body (702) are fixedly arranged on the buckling ring (701); the quick-setting agent (8) is placed in the bag body (702) and between the two buckling rings (701).
5. The hollow grouting anchor cable according to claim 3, characterized in that: The outer diameter of the buckling ring (701) is greater than the outer diameter of the anchor rod (1); the second slurry outlet (6) is arranged in the middle of the bag (7); and the bag body (702) is in the shape of a tube with openings at both ends.
6. The hollow grouting anchor cable according to claim 5, characterized in that: The bursting valve (4) is in the form of a tube with closed upper and lower ends; the bursting valve (4) is coaxially arranged with the anchor rod (1); both ends of the bursting valve (4) are fixedly arranged on the anchor rod (1); the grouting pipe (3) passes through the bursting valve (4) and is fixedly arranged on the inner bottom surface of the anchor rod (1); and the grouting outlet (5) is arranged on the grouting pipe (3) in the middle of the bursting valve (4).
7. The hollow grouting anchor cable according to claim 6, characterized in that: The outer diameter of the bursting valve (4) is equal to the outer diameter of the anchor rod (1).
8. The hollow grouting anchor cable according to claim 1 or 7, characterized in that: The anchor (2) comprises an anchor plate (201) and a locking piece; the anchor rod (1) is arranged to penetrate the anchor plate (201); and the locking piece is threadedly arranged on the anchor rod (1).
9. The hollow grouting anchor cable according to claim 8, characterized in that: A gap is provided between the anchor plate (201) and the outer wall of the anchor rod (1); and a convex surface is provided in the middle of the anchor plate (201).
10. The hollow grouting anchor cable according to claim 9, characterized in that: The locking member comprises a locking nut (202); the locking nut (202) is threadedly arranged on the anchor rod (1); a wedge (203) is arranged on the outer sleeve of the locking nut (202); the locking nut (202) and the wedge (203) are wedge-matched; and the wedge (203) is arranged between the locking nut (202) and the anchor plate (201).