CN216866748U - High pretightening force opposite pulling type mine anchor cable - Google Patents

Abstract

The utility model discloses a high-pretightening-force opposite-pulling type mine anchor cable which comprises an anchor cable rod body formed by twisting a plurality of steel strands and a first pretightening end fixedly connected with one end of the anchor cable rod body and used for installing a lock, wherein a birdcage structure formed by a plurality of steel strands in a protruding mode is arranged on the anchor cable rod body, a second pretightening end used for installing the lock is fixedly connected with the other end of the anchor cable rod body, a plurality of hoops are arranged on the anchor cable rod body, an anchoring agent sheet is wound on the anchor cable rod body of each hoop, the hoops drive the anchoring agent sheet through rotating the anchor cable rod body, two types of filling materials in the anchoring agent sheet are mixed and stirred, and a limiting block is fixedly arranged on the anchor cable rod body and used for limiting the anchoring agent sheet to slide relatively in the filling and drilling processes.

Description

High pretightening force opposite pulling type mine anchor cable

Technical Field

The utility model relates to the technical field of underground anchoring support of coal mines, in particular to a high-pretightening-force opposite-pulling type mine anchor cable.

Background

The structure of the anchor cable used in the support of the mine at present is a steel cable, a spherical tray, a set of anchorage devices and a set of tension devices. The construction process comprises the following steps: after drilling, feeding resin anchoring agent by using an anchor cable, connecting the anchor cable with an anchor cable machine, rotating the anchor cable machine to drive the anchor cable to rotate, stir and push, fully mixing the resin anchoring agent uniformly, reacting and curing, mounting a spherical tray, tensioning the anchor cable by using a tensioning device, and finally fixing the anchor cable by using an upper anchorage device. The steel cable (steel wire rope) in the anchor cable has certain curvature naturally when being in certain length, and is bound to bear certain resistance when being fed into a drill hole, and the diameter of the steel cable is smaller than the inner diameter of the drill hole, so that the steel cable is bent after being fixed by a resin anchoring agent in the drill hole, when a fastening end is fastened, the steel cable is straightened, the steel cable is loosened in the resin anchoring agent, and the steel cable forms a long section of extension length to reduce the anchoring strength of the steel cable. Secondly, because the steel cable is in a smooth rod shape, the contact area between the resin anchoring agent and the steel cable is small, the anchoring strength of the anchor cable is not enough, and the possibility of production is included. Thirdly, after the steel cable is fixed in the drilled hole, a special anchorage device is needed to fix the fastening piece on the end of the steel cable extending out of the drilled hole, so that the tray can be fixed, and the anchoring process is more complicated.

Birdcage (or bird's nest) the main function in the birdcage (or bird's nest) anchor rope is to guarantee that the anchor rope is placed in the middle relatively in drilling, and fine stirring resin anchoring agent (anchor slurry) makes resin anchoring agent (anchor slurry) permeate the birdcage, and resin anchoring agent (anchor slurry), anchor rope become a whole with the better consolidation of drilling, very big improvement anchor power. Especially, the size of the birdcage can be designed according to the diameter of the drilled hole, so that the anchoring force of the grouting anchor cable is improved, and the requirement of applying high pretightening force in the initial stage is met.

In the coal resource mining process, the continuous working face roadway arrangement is particularly important, and in order to ensure the stability of the continuous working face roadway arrangement, coal pillars with larger sizes are usually reserved, so that the waste of coal resources is caused, the deformation is serious, and the maintenance cost is high. In order to avoid the problems, the staggered-level gob-side entry driving is widely applied, the roadway is arranged in a stress reduction area, and coal resources are recycled. For mining of an extra-thick coal seam, when a working face is influenced by strong mine pressure, a plastic zone of a coal pillar reserved along a goaf at a staggered layer position is rapidly expanded, cracks are easily communicated with the goaf, air leakage and spontaneous combustion of left coal in the goaf are caused, and serious potential safety hazards are brought to efficient production of a mine. The large coal pillar anchoring problem can be solved to a certain extent by adopting a birdcage (or bird nest) anchor cable aiming at the existing reserved coal pillar mining operation, but the reserved large coal pillar has the problem of coal resource waste, and the reserved small coal pillar operation reduces the bearing capacity of the coal pillar, so that the side wall part of a gob side roadway mining area is seriously deformed, the coal pillar is rapidly unstable, a certain rock burst problem is induced, and the existing anchor cable needs to be modified.

SUMMERY OF THE UTILITY MODEL

Aiming at the problem that the small coal pillars are left for operation and are deformed due to instability in the background technology, the anchor cable is modified based on the conventional (or bird nest) anchor cable, and meanwhile, the shape of the anchoring agent is modified in a adaptability manner, so that the high-pretightening-force opposite-pulling type mining anchor cable is provided.

In order to achieve the purpose, the utility model adopts the following technical scheme: high pretightning force is to mining anchor rope of formula of drawing, include the anchor rope body of rod that is formed by stranded steel strand wires twist and fixedly connected with first pretension end that is used for installing the tool to lock on one end, be equipped with on the anchor rope body of rod by the stranded steel strand wires protruding birdcage structure that forms fixedly connected with second pretension end that is used for installing the tool to lock on the other end of the anchor rope body of rod, install a plurality of clamps on the anchor rope body of rod, it is a plurality of to be located a plurality of the winding has the anchor tablet on the anchor rope body of rod of clamp, and is a plurality of the clamp drives it through rotatory anchor rope body of rod and punctures the anchor tablet, makes two kinds of irritated thing mixing stirring in the anchor tablet, fixed mounting has the stopper on the anchor rope body of rod, the stopper is used for restricting the anchor tablet and takes place relative slip filling drilling process.

As a further supplement to the above technical solution, a protective cap is mounted on the first pretensioning end and/or the second pretensioning end for protecting the pretensioning end from corrosion, rusting or mechanical external force.

As a further supplement to the above technical scheme, the limiting blocks comprise two limiting blocks, and the clamps are located between the two limiting blocks.

As a further supplement to the above technical solution, the plurality of birdcage structures are included, and the plurality of birdcage structures are located between and/or outside the two limiting blocks.

As a further supplement to the above technical solution, a support ring is provided in the stranded steel wires of the birdcage structure, and the support ring is used for increasing the stability and strength of the birdcage structure.

As a further supplement to the above technical solution, the anchoring agent sheet comprises a strip-shaped filling bag made of a polyester film, the inside of the strip-shaped filling bag is divided into two independently sealed filling cavities by a dividing line, and the two filling cavities are filled with unsaturated polyester resin and marble powder respectively.

As a further supplement to the above technical solution, the support ring comprises an annular body made of a rigid material, in which a hollow hole is provided, and the edge of which is provided with a groove corresponding to the plurality of steel strands.

As a further supplement to the above technical solution, a plurality of fracture grooves are formed in the annular body located inside the hollow hole, and the fracture grooves break the structure of the support ring under the action of a pre-tightening force, so that the plurality of steel strands protruding from the birdcage structure are tightly attached together, thereby reducing the anchoring stress load of the anchor cable.

Compared with the prior art, the utility model has the following advantages: 1. the single-head pre-tightening end of the traditional anchor cable of the birdcage (or the bird nest) is designed into a double-head pre-tightening end, so that the anchor cable for the mine penetrates through the small coal pillar, and the tray locks are arranged at the two ends of the anchor cable, so that the counter-pulling pre-tightening force for the two sides of the small coal pillar is formed, and the safety accidents caused by the deformation of the side walls of the small coal pillar are prevented; 2. according to the utility model, the anchor cable rod body is fixedly provided with the limiting block, so that the strip-shaped anchoring agent pieces are prevented from sliding relatively in the filling and drilling process; 3. the anchor cable sheet is characterized in that a plurality of clamps are arranged on an anchor cable rod body, the clamps are driven to puncture an anchoring agent sheet by rotating the anchor cable rod body, unsaturated polyester resin and marble powder in the anchoring agent sheet are mixed and stirred, and the anchor cable rod body is anchored in a coal wall rock mass around a drill hole; 4. the support ring is arranged in the stranded steel strands of the birdcage structure, and is used for increasing the stability and strength of the birdcage structure, and the structure of the support ring is damaged under the action of pretightening force, so that the plurality of stranded steel strands protruding from the birdcage structure are tightly attached together, and the anchoring stress load of the anchor cable is reduced; 5. according to the utility model, the protective cap is arranged on the first pre-tightening end and/or the second pre-tightening end, so that the anchor cable rod body is prevented from being corroded, rusted or damaged by mechanical external force in the process of penetrating the anchor cable rod body through the small coal pillar.

Drawings

FIG. 1 is a perspective view of the present invention;

FIG. 2 is a schematic structural view of the present invention;

FIG. 3 is an assembled view of the present invention;

FIG. 4 is a perspective view of a support ring according to the present invention;

FIG. 5 is a perspective view of a clamp band of the present invention;

FIG. 6 is a schematic plan view of an anchoring agent sheet according to the present invention;

FIG. 7 is a reference diagram of the present invention applied to the small coal pillar anchoring support;

in the figure: the anchor cable comprises an anchor cable rod body 1, a first pre-tightening end 2, a second pre-tightening end 3, a birdcage structure 4, a limiting block 5, a hoop 6, an anchoring agent sheet 7, a protective cap 8, a support ring 9 and a dividing line 10;

in fig. 4, an annular body 901, a hollow bore 902, a recess 903, and a fracture groove 904 are illustrated.

Detailed Description

In order to further illustrate the technical solution of the present invention, the present invention is further illustrated by the following examples.

Referring to fig. 1 to 5, the high pre-tightening force opposite-pulling type mining anchor cable comprises an anchor cable rod body 1 formed by twisting a plurality of steel strands, and a first pre-tightening end 2 fixedly connected with one end of the anchor cable rod body 1 and used for installing a lock, a second pre-tightening end 3 fixedly connected with the other end of the anchor cable rod body 1 and used for installing the lock, a protective cap 8 is arranged on the first pre-tightening end 2 and/or the second pre-tightening end 3 and used for protecting the anchor cable rod body from corrosion, rusting and damage or mechanical external force damage, a birdcage structure 4 formed by a plurality of steel strands in a protruding mode is arranged on the anchor cable rod body 1, a plurality of hoops 6 are arranged on the anchor cable rod body 1, anchoring agent sheets 7 are wound on the rod body of the hoops 6, the hoops 6 drive the hoops to puncture the anchoring agent sheets 7 by rotating the anchor cable rod body 1, so that two types of filling materials in the anchoring agent sheets 7 are mixed and stirred, the anchor cable rod body 1 is fixedly provided with two limiting blocks 5, each limiting block 5 comprises two limiting blocks 6, the plurality of hoops 6 are respectively positioned between the two limiting blocks 5 and used for limiting relative sliding of the anchoring tablets 7 in the filling and drilling process, the birdcage structure 4 comprises a plurality of birdcage structures 4 positioned in the middle and/or outside of the two limiting blocks 5, a support ring 9 is arranged in the stranded steel wires of the birdcage structure 4, the support ring 9 comprises an annular body 901, the annular body 901 is made of a rigid material, a hollow hole 902 is arranged in the annular body, the edge of the annular body is provided with a groove 903 corresponding to the stranded steel wires, the annular body 901 positioned in the hollow hole 902 is provided with a plurality of fracture grooves 904, the fracture grooves damage the structure of the support ring 9 under the action of pre-tightening force, so that the plurality of stranded steel wires protruding from the birdcage structures 4 are tightly attached together, thereby reducing anchor cable anchoring stress loads, and the support ring 9 thereby serves to increase the stability and strength of the birdcage structure 4.

Further, referring to fig. 6, the anchoring agent sheet 7 includes a band-shaped filling bag made of a polyester film, the inside of which is divided into two independently sealed filling cavities by a dividing line 10, and the two filling cavities are filled with unsaturated polyester resin and marble powder, respectively.

Referring to fig. 7, by using the mining anchor cable, firstly, a coal wall with a protective coal pillar is reserved for drilling, then, an anchor cable machine is used for connecting a first pre-tightening end 2 exposed outside the drilled hole, the anchor cable machine rotates to drive the anchor cable to rotate, stir and push, so that a second pre-tightening end 3 sleeved with a protective cap 8 is placed into the drilled hole, meanwhile, two independently sealed filling cavities wound with an anchoring agent sheet 7 are punctured by a hoop 6, unsaturated polyester resin and marble powder in the anchoring agent sheet 7 are mixed and stirred, an anchor cable rod body is anchored in a coal wall rock body around the drilled hole, finally, a tray is installed, the anchor cable is tensioned by a tensioning device, and finally, the anchor cable is fixed by an upper anchorage device. When the second pre-tightening end 3 in the protective coal pillar is met in the mining process, the protective caps 8 are removed one by one, a tray is installed on the second pre-tightening end 3, the anchor cable is tensioned by a tensioning device, and finally the anchor cable is fixed by an upper anchorage device.

While there have been shown and described what are at present considered to be the essential features and advantages of the utility model, it will be apparent to those skilled in the art that the utility model is not limited to the details of the foregoing exemplary embodiments, but is capable of other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims (8)

1. Mining anchor rope of high pretightning force formula of drawing to each other includes the anchor rope body of rod (1) that forms by the twist of stranded steel strand wires and fixedly connected with on one end of it is used for installing first pretension end (2) of tool to lock, be equipped with on the anchor rope body of rod (1) by the stranded steel strand wires protruding birdcage structure (4) that form, its characterized in that: fixedly connected with is used for installing second pretension end (3) of tool to lock on the other end of the anchor rope body of rod (1), install a plurality of clamps (6) on the anchor rope body of rod (1), be located a plurality of the winding has anchor tablet (7) on the anchor rope body of rod (1) of clamp (6), and is a plurality of clamp (6) drive its puncture anchor tablet (7) through rotatory anchor rope body of rod (1), make two kinds of irritated material mixing stirring in anchor tablet (7), fixed mounting has stopper (5) on the anchor rope body of rod (1), stopper (5) are used for restricting anchor tablet (7) and take place relative slip filling drilling in-process.

2. The high-pretightening-force opposite-pulling type mine anchor cable according to claim 1, wherein: and a protective cap (8) is arranged on the first pretightening end (2) and/or the second pretightening end (3) and is used for protecting the pretightening end from being corroded, rusted and damaged or damaged by mechanical external force.

3. The high pre-tightening force counter-pulling type mining anchor cable according to claim 1 or 2, wherein: stopper (5) include two, and are a plurality of clamp (6) all are located two between stopper (5).

4. The high pre-tightening force counter-pulling type mining anchor cable according to claim 3, wherein: the birdcage structure (4) comprises a plurality of birdcage structures (4) which are positioned in the middle and/or outside of the two limit blocks (5).

5. The high pre-tightening force counter-pulling type mining anchor cable according to claim 1, 2 or 4, wherein: and a support ring (9) is arranged in the stranded steel wires of the birdcage structure (4), and the support ring (9) is used for increasing the stability and the strength of the birdcage structure (4).

6. The high-pretightening-force opposite-pulling type mine anchor cable according to claim 5, wherein: the anchoring agent sheet (7) comprises a strip-shaped filling bag made of a polyester film, the interior of the strip-shaped filling bag is divided into two independently sealed filling cavities through a dividing line (10), and unsaturated polyester resin and marble powder are respectively filled in the two filling cavities.

7. The high-pretightening-force opposite-pulling type mining anchor cable as claimed in claim 5, wherein: the support ring (9) comprises an annular body (901), the annular body (901) is made of rigid materials, a hollow hole (902) is formed in the annular body, and grooves (903) corresponding to the strands of steel strands are formed in the edge of the annular body.

8. The high pre-tightening force counter-pulling type mining anchor cable according to claim 7, wherein: a plurality of fracture grooves (904) are formed in an annular body (901) located in the hollow hole (902) and break the structure of the support ring (9) under the action of pretightening force, so that a plurality of strands of steel strands protruding from the birdcage structure (4) are tightly attached together, and the anchoring stress load of the anchor cable is reduced.

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