CN211314250U

CN211314250U - Mechanical anchor rod capable of applying pretightening force and recycling

Info

Publication number: CN211314250U
Application number: CN202020004171.2U
Authority: CN
Inventors: 刘攀; 许鸿亮; 王鹏彪; 张少雄; 孙龙; 朱勇; 谢全敏
Original assignee: Wuhan University of Technology WUT; No 1 Engineering Co Ltd of CCCC First Highway Engineering Co Ltd
Current assignee: Wuhan University of Technology WUT; No 1 Engineering Co Ltd of CCCC First Highway Engineering Co Ltd
Priority date: 2020-01-02
Filing date: 2020-01-02
Publication date: 2020-08-21
Anticipated expiration: 2030-01-02

Abstract

The utility model discloses a mechanical anchor rod capable of applying pretightening force and recovering, which comprises a twisted steel, a pretightening nut, a backing plate, a hollow dowel bar, a dowel foot pad, a friction cushion block and an end part sliding limiting body; the pre-tightening nut is connected with the threaded steel bar through threads, and a round hole without threads is formed in the center of the backing plate and is used for penetrating through the threaded steel bar; the hollow dowel bar is positioned between the base plate and the force transmission foot pad, the inner diameter of the hollow dowel bar is larger than a circular hole in the center of the base plate, and the hollow dowel bar is connected with the force transmission foot pad through threads; the end part sliding limiting body is connected with the twisted steel through threads; the friction cushion block is located between the force transmission foot pad and the end part sliding limiting body, and the outer surface of the friction cushion block is in contact with the hole wall and used for increasing the friction force between the mechanical anchor rod and the hole wall. Compared with the traditional mechanical anchor rod, the novel anchor rod has the advantages of capability of applying pretightening force, large friction force, increase of the friction force along with the deformation of the anchor rod, detachable recovery and hopeful of large-scale popularization in the field of tunnel and mine roadway support.

Description

Mechanical anchor rod capable of applying pretightening force and recycling

Technical Field

The utility model belongs to the technical field of tunnel engineering consolidates, a tunnel engineering consolidates and struts, concretely relates to can apply recoverable mechanical type stock of pretightning force.

Background

The anchor rod is a widely used support means, can strengthen the surrounding rocks of the underground engineering together, strengthen the intensity of the surrounding rocks in the anchoring range, thus ensure the safety of the underground engineering, the mechanical anchor rod is an anchoring device or an anchor rod body which is contacted with the hole wall and plays the anchoring role by the friction force, is the earliest and most anchoring rod used in the mine roadway support, and generally consists of a rod body, an expanding shell, a base plate and a nut. The mechanical anchor rod has the advantages of being rapid in installation, capable of achieving bearing capacity immediately and capable of being tensioned for the second time, and has the defects that an anchoring section in a drilled hole is short, anchoring force is low, the anchor rod is easy to loosen and needs to be tensioned again, and rock stratum damage, anchoring agent loosening and the like can be caused even in a high-stress area.

The reason for the above disadvantages is that the existing mechanical anchor rod expansion shell is too simple in design, the contact area with the hole wall after expansion is too small, the generated friction force is limited, and the hole wall friction force has the tendency of retracting the expansion shell, so that the pretightening force is gradually lost. Therefore, the defect of the novel mechanical anchor rod on the principle is overcome, on one hand, the contact area and the contact surface roughness of the expansion shell and the hole wall are increased, the contact surface is fully coupled, on the other hand, the pretightening force of the anchor rod in the stress process tends to be increased, the effect of pulling more and more is generated, and the design of the novel mechanical anchor rod is in the direction of the effort.

SUMMERY OF THE UTILITY MODEL

To the above-mentioned problem and the shortcoming that exist among the prior art, the utility model provides a can apply recoverable mechanical type stock of pretightning force, for traditional mechanical type stock, this novel stock has can apply pretightning force, frictional force is big, frictional force increases along with the stock deformation, can dismantle the advantage of retrieving, is expected to promote on a large scale in tunnel and mine tunnel support field.

Therefore, the utility model adopts the following technical scheme:

a mechanical anchor rod capable of applying pretightening force and being recycled comprises a threaded steel bar, a pretightening nut, a base plate, a hollow dowel bar, a force transmission foot pad, a friction cushion block and an end part sliding limiting body; the pretension nut is connected with the threaded steel bar through threads, a round hole without threads is formed in the center of the backing plate, and the round hole is used for penetrating through the threaded steel bar; the hollow dowel bar is of a hollow tubular structure, is positioned between the base plate and the force transmission foot pad, and is provided with a circular hole with the inner diameter larger than the center of the base plate; the end part sliding limiting body is positioned at the end part of the mechanical anchor rod and is in threaded connection with the threaded steel bar; the friction cushion block is located between the force transmission foot pad and the end part sliding limiting body, and the outer surface of the friction cushion block is in contact with the hole wall and used for increasing the friction force between the mechanical anchor rod and the hole wall.

Preferably, the outer surface of the end part of the hollow dowel bar is provided with an external thread, and the inner surface of the force transmission foot pad is provided with an internal thread matched with the external thread of the hollow dowel bar.

Preferably, the end part slide limiting body comprises a threaded hole, a slide limiting surface, a slide resisting body and a slide rail, and the threaded hole is connected with the threaded steel bar in a matching manner; the sliding limiting surface is positioned on the side surface of the end sliding limiting body and is obliquely arranged; the sliding rail is positioned in the middle of the sliding limiting surface, and the friction cushion block is connected with the end sliding limiting body through the sliding rail; the anti-slip body is located at the end part of the end part slip limiting body and used for limiting the friction cushion block to slip out along the sliding rail.

Preferably, the sliding limiting surface and the sliding rail are used for enabling the friction cushion block to move up and down along the inclined direction of the sliding rail and preventing the friction cushion block from moving perpendicular to the inclined surface.

Preferably, the upper part of the end sliding limiting body is a multi-edge platform, the lower part of the end sliding limiting body is a circular truncated cone, and each surface of the multi-edge platform is provided with a sliding rail.

Preferably, the upper part of the end sliding limiting body is a quadrangular frustum pyramid.

Preferably, the contact surface of the friction cushion block and the hole wall is in a sawtooth shape or a barb shape, which depends on the application scene.

Compared with the prior art, the beneficial effects of the utility model are that:

(1) the utility model discloses mainly be applied to tunnel engineering and consolidate and strut, the cavity dowel steel of this stock can transmit the power of pretightening nut for the friction cushion, and promote the friction cushion and withstand the pore wall along the slide rail slant on the tip limit slip body, further tighten along with the pretightening nut, the power of transmitting for the friction cushion through the cavity dowel steel is just big more, make the further upward movement of friction cushion, the contact force of friction cushion and pore wall further increases, imbed the pore wall rock mass even, the tangential friction power between friction cushion and pore wall has actually been increased, the tangential friction power between a plurality of friction cushions and pore wall has constituted the withdrawal resistance of this novel mechanical type stock jointly. The pretightening force applied by the pretightening nut compresses the hollow dowel bar on one hand and stretches the reinforcing steel bar on the other hand, so that the reinforcing steel bar has certain prestress. After the anchor rod is installed, along with the increase of surrounding rock deformation, the anchor rod moves to further increase the friction force between the friction cushion block and the hole wall, so that the defect that the anchoring force of the existing mechanical anchor rod disappears is overcome. Meanwhile, the end part sliding limiting body is also provided with a sliding-resistant module to prevent the friction cushion block from sliding out and losing efficacy. If the anchor rod is required to be recovered after the supporting mission is finished, the anchor rod can be loosened and disassembled only by inwards jacking the anchor rod along the axis of the anchor rod, and the recovery is convenient.

(2) Compared with the traditional mechanical anchor rod, the novel anchor rod has the advantages of capability of applying pretightening force, large friction force, increase of the friction force along with the deformation of the anchor rod, detachable recovery and hopeful of large-scale popularization in the field of tunnel and mine roadway support.

Drawings

Fig. 1 is a schematic structural view of a mechanical anchor rod capable of applying a recoverable pre-tightening force provided by the present invention.

Fig. 2 is a top view of the end sliding-limiting body of the mechanical anchor rod capable of applying the recoverable pretightening force provided by the utility model.

Fig. 3 is a side view of the end sliding-limiting body of the mechanical anchor rod capable of applying the recoverable pretightening force provided by the utility model.

Description of reference numerals: 1. twisted steel bars; 2. pre-tightening the nut; 3. a base plate; 4. a hollow dowel bar; 5. a force transmission foot pad; 6. a friction cushion block; 7. an end sliding limiting body; 8. a threaded hole; 9. a limited slip surface; 10. a slip-resistant body; 11. a slide rail.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings and specific embodiments, which are only used for explaining the present invention, but not for limiting the present invention.

As shown in fig. 1, the utility model discloses a recoverable mechanical anchor rod capable of applying pretightening force, which comprises a deformed steel bar 1, a pretightening nut 2, a backing plate 3, a hollow dowel bar 4, a force transmission foot pad 5, a friction cushion block 6 and an end part sliding limiting body 7; the pre-tightening nut 2 is in threaded connection with the threaded steel bar 1, a round hole without threads is formed in the center of the backing plate 3 and is used for penetrating through the threaded steel bar 1; the hollow dowel bar 4 is of a hollow tubular structure, is positioned between the backing plate 3 and the force transmission foot pad 5, has an inner diameter larger than a circular hole in the center of the backing plate 3, and is connected with the force transmission foot pad 5 through threads; the end part sliding limiting body 7 is positioned at the end part of the mechanical anchor rod, and the end part sliding limiting body 7 is in threaded connection with the deformed steel bar 1; the friction cushion block 6 is located between the force transmission foot pad 5 and the end part sliding limiting body 7, and the outer surface of the friction cushion block 6 is in contact with the hole wall and used for increasing the friction force between the mechanical anchor rod and the hole wall.

The outer surface of the end part of the hollow dowel bar 4 is provided with an external thread, and the inner surface of the dowel bar 5 is provided with an internal thread matched with the external thread of the hollow dowel bar 4.

Specifically, as shown in fig. 2 and 3, the end sliding-limiting body 7 includes a threaded hole 8, a sliding-limiting surface 9, a sliding-blocking body 10 and a sliding rail 11, and the threaded hole 8 is in matching connection with the deformed steel bar 1; the sliding limiting surface 9 is positioned on the side surface of the end sliding limiting body 7 and is obliquely arranged; the slide rail 11 is positioned in the middle of the slide limiting surface 9, and the friction cushion block 6 is connected with the end slide limiting body 7 through the slide rail 11; the anti-sliding body 10 is located at the end of the end sliding limiting body 7 and used for limiting the friction cushion block 6 to slide out along the sliding rail 11.

The sliding limiting surface 9 and the sliding rail 11 are used for enabling the friction cushion block 6 to move up and down along the inclined direction of the sliding rail 11 and preventing the friction cushion block 6 from moving perpendicular to the inclined surface.

The upper part of the end part sliding limiting body 7 is a multi-edge platform, the lower part of the end part sliding limiting body is a circular truncated cone, and each surface of the multi-edge platform is provided with a sliding rail 11.

Specifically, the upper part of the end sliding limiting body 7 is a quadrangular frustum pyramid.

The contact surface of the friction cushion block 6 and the hole wall is in a sawtooth shape or a barb shape and is determined according to an application scene.

Examples

Referring to fig. 1, 2 and 3, the utility model discloses a can apply recoverable mechanical type stock of pretightning force, its constitution is: the device comprises a twisted steel bar 1, a pretightening nut 2, a backing plate 3, a hollow dowel bar 4, a force transmission foot pad 5, a friction cushion block 6 and an end part sliding limiting body 7, wherein the end part sliding limiting body 7 comprises a threaded hole 8, a sliding limiting surface 9, a sliding resisting body 10 and a sliding rail 11.

The connection mode of the parts is as follows: the pretension nut 2 is in threaded connection with the threaded steel bar 1, a round hole without threads is formed in the backing plate 3, the threaded steel bar 1 can penetrate through the round hole, and the diameter of the round hole is smaller than that of the hollow dowel bar 4. The outer surface of the end part of the hollow dowel bar 4 is provided with threads, the force transmission foot pad 5 is provided with a threaded hole, and the force transmission foot pad 5 is connected with the hollow dowel bar 4 through the threads; the friction cushion block 6 is connected with the end part sliding limiting body 7 through a sliding rail 11, the sliding limiting surface 9 and the sliding rail 11 can enable the friction cushion block 6 to move up and down along the inclined direction of the sliding rail 11, but the sliding limiting surface cannot move perpendicular to the inclined surface, and meanwhile, the sliding blocking body 10 can limit the friction cushion block 6 to slide out along the sliding rail 11. The upper part of the end part sliding limiting body 7 is a quadrangular frustum pyramid, the lower part is a circular truncated cone, four surfaces of the quadrangular frustum pyramid are respectively provided with 1 sliding rail 11, and the sliding limiting body can also be other polyhedrons and is designed according to the use convenience. The middle part of the end part sliding limiting body 7 is provided with a threaded hole 8, and the end part sliding limiting body 7 is in threaded connection with the threaded steel bar 1.

The installation use process of this stock does: screwing a hollow dowel bar 4 on a force transmission foot pad 5 through threads, sleeving a deformed steel bar 1, then putting a friction cushion block 6 on a slide rail 11 of an end part sliding limiting body 7, screwing the deformed steel bar 1 on the end part sliding limiting body 7 with the friction cushion block 6 to enable the force transmission foot pad 5 to be in contact with the end part of the friction cushion block 6, then sleeving a base plate 3 into the deformed steel bar 1, then inserting an anchor rod into a drilled hole to go deep into the bottom of the hole, and screwing a pre-tightening nut 2 on the exposed part of the deformed steel bar 1. When the pretightening nut 2 advances along the threaded steel bar 1, the threaded steel bar 1 can drive the end part sliding limiting body 7 to move outwards together, the hollow dowel bar 4, the force transmission foot pad 5 and the friction cushion block 6 are unchanged relative to the positions of the base plate 3 and the pretightening nut 2, the end part sliding limiting body 7 can move relative to the friction cushion block 6, the friction cushion block 6 moves upwards along the slide rail 11, and the friction cushion block 6 starts to be contacted with the hole wall under the pushing of the hollow dowel bar 4 along with the further screwing of the pretightening nut 2. Afterwards, each tightening of the pre-tightening nut 2 means that the contact force between the friction cushion block 6 and the hole wall is further increased, the friction force prevents the whole threaded steel bar 1 from moving outwards, and at the moment, the threaded steel bar 1 deforms under the action of the friction force and the pulling force jointly applied by the pre-tightening nut 2, so that certain pre-stress is generated. In order to increase the friction force, the contact surface of the friction cushion block 6 and the hole wall can be designed into a sawtooth shape or a barb shape, depending on the application scene.

The above description is only for the preferred embodiment of the present invention and should not be taken as limiting the invention, and any modifications, equivalent replacements, and improvements made within the spirit and principle scope of the present invention should be included within the protection scope of the present invention.

Claims

1. The utility model provides a can exert recoverable mechanical type stock of pretightning force which characterized in that: the device comprises a twisted steel bar (1), a pre-tightening nut (2), a base plate (3), a hollow force transmission rod (4), a force transmission foot pad (5), a friction cushion block (6) and an end part sliding limiting body (7); the pre-tightening nut (2) is connected with the threaded steel bar (1) through threads, a round hole without threads is formed in the center of the backing plate (3), and the round hole is used for penetrating through the threaded steel bar (1); the hollow dowel bar (4) is of a hollow tubular structure, is positioned between the backing plate (3) and the force transmission foot pad (5), has an inner diameter larger than a circular hole in the center of the backing plate (3), and is connected with the force transmission foot pad (5) through threads; the end part sliding limiting body (7) is positioned at the end part of the mechanical anchor rod, and the end part sliding limiting body (7) is in threaded connection with the threaded steel bar (1); the friction cushion block (6) is located between the force transmission foot pad (5) and the end part sliding limiting body (7), and the outer surface of the friction cushion block (6) is in contact with the hole wall and used for increasing the friction force between the mechanical anchor rod and the hole wall.

2. The mechanical anchor rod capable of applying pretightening force and recovering the pretightening force according to claim 1, wherein: the outer surface of the end part of the hollow dowel bar (4) is provided with an external thread, and the inner surface of the force transmission foot pad (5) is provided with an internal thread matched with the external thread of the hollow dowel bar (4).

3. The mechanical anchor rod capable of applying pretightening force and recovering the pretightening force according to claim 1, wherein: the end part sliding limiting body (7) comprises a threaded hole (8), a sliding limiting surface (9), a sliding resisting body (10) and a sliding rail (11), and the threaded hole (8) is connected with the threaded steel bar (1) in a matching mode; the sliding limiting surface (9) is positioned on the side surface of the end sliding limiting body (7) and is obliquely arranged; the sliding rail (11) is positioned in the middle of the sliding limiting surface (9), and the friction cushion block (6) is connected with the end sliding limiting body (7) through the sliding rail (11); the anti-slip body (10) is located at the end of the end slip limiting body (7) and used for limiting the friction cushion block (6) to slip out along the sliding rail (11).

4. A mechanical rock bolt capable of applying pre-tension and recovering according to claim 3, wherein: the sliding limiting surface (9) and the sliding rail (11) are used for enabling the friction cushion block (6) to move up and down along the inclined direction of the sliding rail (11) and preventing the friction cushion block (6) from moving perpendicular to the inclined plane.

5. A mechanical rock bolt capable of applying pre-tension and recovering according to claim 3, wherein: the upper part of the end part sliding limiting body (7) is a multi-edge platform, the lower part of the end part sliding limiting body is a circular truncated cone, and each surface of the multi-edge platform is provided with a sliding rail (11).

6. The mechanical anchor rod capable of applying pretightening force and recovering the pretightening force according to claim 5, wherein: the upper part of the end part sliding limiting body (7) is a quadrangular frustum pyramid.

7. A recoverable mechanical anchor according to any one of claims 1 to 6, wherein: the contact surface of the friction cushion block (6) and the hole wall is in a sawtooth shape or a barb shape and is determined according to an application scene.