CN117803430A - Anchor cable device and anchoring method thereof - Google Patents

Abstract

The invention provides an anchor cable device and an anchor method thereof, and relates to the field of surrounding rock anchoring. The anchor cable device comprises a steel strand, wherein the tail part of the steel strand can be anchored to surrounding rock through an anchoring agent, and the outer end of the steel strand can be fixed to the surrounding rock through a fixing assembly; the steel strand wires are provided with at least one impeller along its extending direction, and the impeller cover is located outside the steel strand wires, and the impeller can be packed into the anchor rope downthehole, and the diameter of impeller is greater than the aperture in anchor rope hole. According to the anchor cable device, when the steel strand is subjected to tensile force, the hole wall of the anchor cable hole can form a barrier to the blades of the impeller, namely, the friction resistance between the anchor cable device and surrounding rock can be increased through the arrangement of the impeller, so that the tensile force deformation of the surrounding rock can be resisted, and the stability of the surrounding rock is maintained. In addition, the impeller can also enable the steel strand wires to be centered in the anchor rope hole, namely, the coaxiality of the steel strand wires and the anchor rope hole can be improved, so that the tail parts of the steel strand wires cannot excessively deflect, the contact area of the steel strand wires and the anchoring agent can be guaranteed, and the anchoring force and the anchoring effect are finally guaranteed.

Description

Anchor cable device and anchoring method thereof

Technical Field

The invention relates to the technical field of surrounding rock anchoring, in particular to an anchor cable device and an anchoring method thereof.

Background

The geological conditions of deep mining of the coal mine are complex, and higher requirements are put forward for the control of roadway surrounding rock under the conditions of high stress, soft rock and strong mining.

The anchor cable is a prestress steel strand with the outer end fixed on the surface of surrounding rock of a roadway and the other end anchored in a stable rock body in a sliding surface, and the prestress steel strand directly generates anti-sliding resistance on the sliding surface, increases the anti-sliding friction resistance, and enables the structural surface to be in a compressed state so as to improve the integrity of the surrounding rock body, thereby fundamentally improving the mechanical property of the rock body and effectively controlling the displacement of the rock body.

However, the anchor cable in the prior art has poor anchoring effect and cannot meet the anchoring requirement.

Disclosure of Invention

The first object of the present invention is to provide an anchor cable device, so as to solve the technical problem of poor anchoring effect of the anchor cable device in the prior art.

The invention provides an anchor cable device which comprises a steel strand, wherein the tail part of the steel strand can be anchored to surrounding rock through an anchoring agent, and the outer end of the steel strand can be fixed to the surrounding rock through a fixing assembly; the steel strand wires are provided with at least one impeller along its extending direction, the impeller cover is located outside the steel strand wires, the impeller can pack into the anchor rope downthehole, just the diameter of impeller is greater than the aperture in anchor rope hole.

Further, one impeller is arranged outside the steel strand, and the impeller is positioned between the middle part of the steel strand and the tail part of the steel strand.

Further, the impeller is fixedly sleeved outside the steel strand, and the rotation direction of the fan blade of the impeller is opposite to the rotation direction of the steel strand when the steel strand is installed.

Further, the anchor cable device further comprises a grouting pipe, and the grouting pipe can extend into the anchor cable hole through the pipe passing hole of the fixing assembly so as to grouting into the anchor cable hole; the steel strand is provided with an exhaust hole communicated with the anchor cable hole and the outside.

Further, the tail of the steel strand is in a snake shape or is fixedly provided with a snake-shaped stirring piece for stirring the anchoring agent.

Further, the anchor cable device further comprises a resistance retaining assembly comprising a sliding block and a constant resistance member; the constant resistance piece is provided with a hollow cavity penetrating through the outer walls of the two ends of the constant resistance piece along the axial direction of the constant resistance piece, and the constant resistance piece can be arranged on a reaming section of an orifice of the anchor cable hole and sleeved outside the steel strand; the inner wall of the hollow cavity is provided with a constant-resistance structure, the sliding block is fixedly connected with the steel strand, and the sliding block can move towards the direction away from the orifice of the anchor cable hole after overcoming the resistance of the constant-resistance structure; the maximum resistance provided by the constant resistance structure is greater than the pretightening force of the anchor cable device and less than the breaking force of the steel strand.

Further, the constant resistance structure extends along the circumference of the inner wall of the hollow cavity, and is uniformly arranged along the axial direction of the constant resistance piece.

Further, the constant-resistance structure comprises constant-resistance teeth, and the side wall, close to the sliding block, of the constant-resistance teeth is perpendicular to the inner wall of the hollow cavity or inclines to the side where the sliding block is located.

Further, the fixing assembly comprises a lock and a tray, wherein the lock is in threaded connection with the steel strand and pushes the sliding block to be in contact with the constant-resistance structure; the tray is fixedly sleeved outside the lockset and is used for being abutted with the rock wall to provide pretightening force.

The anchor cable device provided by the invention has the following beneficial effects:

according to the anchor cable device provided by the invention, the impeller is arranged outside the steel strand, so that when the steel strand is subjected to tensile force, the wall of the anchor cable hole can block the blades of the impeller, namely, the friction resistance between the anchor cable device and surrounding rock can be increased by arranging the impeller, thereby resisting the tensile force deformation of the surrounding rock and keeping the surrounding rock stable. In addition, the impeller can also enable the steel strand wires to be centered in the anchor rope hole, namely, the coaxiality of the steel strand wires and the anchor rope hole can be improved, so that the tail parts of the steel strand wires cannot excessively deflect, the contact area of the steel strand wires and the anchoring agent can be guaranteed, and the anchoring force and the anchoring effect are finally guaranteed.

The second object of the present invention is to provide an anchoring method of an anchor cable device, so as to solve the technical problem of poor anchoring effect of the anchor cable device in the prior art.

The invention provides an anchor cable device anchoring method, which is applied to the anchor cable device and comprises the following steps:

constructing anchor cable holes to the designed depth;

reaming the orifice of the anchor cable hole, and enabling the depth and the section size of the reaming section to be matched with the size of the constant-resistance piece;

placing the anchoring agent into the anchor cable hole, and propping the anchoring agent to the bottom of the anchor cable hole by using a steel strand;

installing the constant resistance piece to a reaming section of the anchor cable hole;

after the tail of the steel strand is anchored, the steel strand is pre-tensioned through the fixing component, and the pre-tensioning force is smaller than the maximum resistance provided by the resistance holding component;

cement slurry is injected into the anchor cable holes through the grouting pipe as required and is solidified.

The anchor cable device anchoring method provided by the invention can anchor the anchor cable device at surrounding rock and the like, so that the anchor cable device has all the advantages of the anchor cable device and is not repeated herein.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural view of an anchor cable device according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of an impeller and a steel strand in the anchor cable device according to the embodiment of the present invention.

Reference numerals illustrate:

100-steel stranded wires; 110-exhaust holes; 200-impeller; 300-grouting pipe; 400-serpentine stirrer; 500-resistance holding assembly; 510-a sliding block; 520-constant resistance piece; 521-constant resistance teeth; 600-fixing assembly; 610-lockset; 620-trays;

700-anchor cable holes; 710-reaming section.

Detailed Description

In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.

The embodiment provides an anchor cable device, as shown in fig. 1, the anchor cable device includes a steel strand 100, the tail of the steel strand 100 can be anchored to surrounding rock through an anchoring agent, and the outer end of the steel strand 100 can be fixed to the surrounding rock through a fixing component 600; the steel strand 100 is provided with at least one impeller 200 along the extending direction thereof, the impeller 200 is sleeved outside the steel strand 100, the impeller 200 can be installed in the anchor cable hole 700, and the diameter of the impeller 200 is larger than the aperture of the anchor cable hole 700.

In the anchor cable device provided in this embodiment, the impeller 200 is arranged outside the steel strand 100, so, when the steel strand 100 is under tension, the hole wall of the anchor cable hole 700 can form a barrier to the blades of the impeller 200, that is, the friction resistance between the anchor cable device and surrounding rock can be increased by the arrangement of the impeller 200, so that the tension deformation of the surrounding rock can be resisted, and the stability of the surrounding rock is maintained. In addition, impeller 200 can also make steel strand wires 100 center in anchor rope hole 700, can improve the axiality of steel strand wires 100 and anchor rope hole 700 promptly to, can make the afterbody of steel strand wires 100 not excessively incline, and then can guarantee the area of contact of steel strand wires 100 and anchoring agent, finally guarantee anchor power and anchoring effect.

Specifically, in this embodiment, an impeller 200 is disposed outside the steel strand 100, and the impeller 200 is located between the middle of the steel strand 100 and the tail of the steel strand 100. So set up, impeller 200 is close to the afterbody setting of steel strand wires 100, can guarantee the afterbody of steel strand wires 100 and anchor rope hole 700 axiality better to can guarantee that the afterbody of steel strand wires 100 has sufficient area of contact with the anchoring agent, can provide sufficient anchoring force.

Of course, in other embodiments of the present application, the number of impellers 200 is not limited to one, such as: along the extending direction of the steel strand 100, one impeller 200 may be disposed at intervals of a set distance outside the steel strand 100.

Specifically, in the present embodiment, the impeller 200 is fixedly sleeved outside the steel strand 100, and the rotation direction of the blades of the impeller 200 is opposite to the rotation direction of the steel strand 100 when the steel strand 100 is installed. In fig. 2, when the blades of the impeller 200 rotate counterclockwise and the steel strand 100 is installed, the steel strand 100 can be rotated clockwise (arrow direction in fig. 2) to rotate and advance, so that the impeller 200 can smoothly enter the anchor cable hole 700; after reaching the installation depth, the steel strand 100 is rotated counterclockwise to embed the blades of the impeller 200 into the surrounding rock. In this way, the impeller 200 not only has the function of centering the steel strand 100, but also can effectively prevent the steel strand 100 from falling out of the anchor cable hole 700.

Specifically, in this embodiment, as shown in fig. 1, the anchor cable device further includes a grouting pipe 300, where the grouting pipe 300 can extend into the anchor cable hole 700 through the pipe passing hole of the fixing assembly 600, so as to grouting into the anchor cable hole 700; the steel strand 100 is provided with an exhaust hole 110 communicating the anchor cable hole 700 with the outside. By means of the arrangement, grouting is conducted to the anchor rope hole 700 through the grouting pipe 300, slurry expands to cracks, the purpose of reinforcing the strength of broken surrounding rock can be achieved, and grouting pressure is stopped after the grouting pressure meets design requirements.

Specifically, in this embodiment, as further shown in fig. 1, the tail of the steel strand 100 is serpentine or fixedly provided with a serpentine stirring member 400 for stirring the anchoring agent. In this arrangement, the tail of the steel strand 100 is serpentine or fixedly provided with the serpentine stirring piece 400, or the tail of the steel strand 100 is bent, so that the size of the steel strand 100 along the radial direction of the anchor cable hole 700 is relatively large in the same long axial size range, and therefore, when the steel strand 100 is used for pushing the anchoring agent to the bottom of the anchor cable hole 700 along the anchor cable hole 700, the tail of the steel strand 100 can be used for fully stirring the anchoring agent, so that the anchoring agent is fully contacted with the hole wall of the anchor cable hole 700, and the situation that the anchoring agent is only contacted with part of the hole wall of the anchor cable hole 700 is effectively avoided, namely, the contact area of the anchoring agent and surrounding rock can be enlarged; meanwhile, the snakelike tail of the steel strand 100 can also enlarge the contact area between the steel strand 100 and the anchoring agent, and the situation that the contact area between the steel strand 100 and the anchoring agent is too small due to the fact that the tail of the steel strand 100 excessively deflects to one side of the anchor cable hole 700 is effectively avoided. That is, in the anchor cable device provided in this embodiment, the tail portion of the steel strand 100 is set to be in a curved serpentine shape, so that the situation that the tail portion of the steel strand is excessively different from the anchor cable hole 700 can be effectively avoided, the contact area between the tail portion of the steel strand and the anchoring agent can be increased, the contact area between the anchoring agent and surrounding rock can be increased by stirring the anchoring agent, and therefore the anchoring force of the tail portion of the steel strand 100 can be improved, and the anchoring effect of the anchor cable device is improved.

Specifically, in this embodiment, as shown in fig. 1, the anchor cable device further includes a resistance retaining assembly 500, and the resistance retaining assembly 500 includes a sliding block 510 and a constant resistance member 520; the constant-resistance piece 520 is provided with a hollow cavity penetrating through the outer walls of the two ends along the axial direction of the constant-resistance piece 520, and the constant-resistance piece 520 can be arranged on the reaming section 710 of the orifice of the anchor cable hole 700 and sleeved outside the steel strand 100; the inner wall of the hollow cavity is provided with a constant-resistance structure, the sliding block 510 is fixedly connected with the steel strand 100, and the sliding block 510 can move towards the direction far away from the orifice of the anchor cable hole 700 after overcoming the resistance of the constant-resistance structure; the constant resistance structure provides a maximum resistance greater than the pretension of the cable means and less than the breaking force of the steel strand 100. So set up, when the anchor rope device receives the pulling force, if the pulling force is greater than the pretightning force, then slider 510 just can closely butt with the constant resistance structure in the constant resistance piece 520, when the pulling force is big Yu Heng and hinders the maximum resistance that the structure provided, the constant resistance structure just can be destroyed, and slider 510 slides to anchor rope hole 700 depths to the big deformation of adaptation country rock effectively avoids steel strand wires 100 to be broken again simultaneously.

Specifically, in this embodiment, the constant-resistance structure is disposed along the circumferential direction of the inner wall of the hollow cavity, and is disposed uniformly along the axial direction of the constant-resistance member 520. In other words, the constant resistance structure is arranged around the inner wall of the hollow cavity of the constant resistance element 520, and may be closed or spiral. And so arranged, the constant resistance member 520 can provide constant tensile resistance in the surrounding rock deformation process so as to resist and adapt to the large deformation of the surrounding rock, namely, when the tension of the surrounding rock makes the sliding block 510 break a circle of constant resistance structure and move forward for a certain distance, the sliding block 510 is tightly abutted with the next circle of constant resistance structure until the tension of the surrounding rock is smaller than the maximum resistance provided by the Yu Heng resistance structure, and the surrounding rock is restored to a stable state.

Specifically, in the present embodiment, the constant-resistance structure includes constant-resistance teeth 521, and the side wall of the constant-resistance teeth 521 near the sliding block 510 is perpendicular to the inner wall of the hollow cavity or inclined to the side where the sliding block 510 is located. Of course, in other embodiments of the present application, the constant resistance structure is not limited to the structure of the constant resistance teeth 521, such as: the constant resistance structure can also be a constant resistance thread.

It should be further noted that, in other embodiments of the present application, the constant-resistance structure may also be a dispersed constant-resistance protrusion, for example: the constant resistance protrusions in each circle of protrusions along the circumferential direction are uniformly arranged at intervals along the axial direction of the hollow cavity of the constant resistance member 520, namely, the specific structural form of the constant resistance structure can be not limited as long as constant resistance can be provided to resist and adapt to large deformation of surrounding rock.

Specifically, in this embodiment, the constant resistance member 520 has a circular or rectangular cross section.

Specifically, in the present embodiment, as shown in fig. 1, the fixing assembly 600 includes a lock 610 and a tray 620, where the lock 610 is screwed to the steel strand 100, and pushes the sliding block 510 into contact with the constant-resistance structure; the tray 620 is fixedly sleeved outside the lock 610 and is used for abutting against the rock wall to provide pretightening force.

In summary, in the anchor cable device provided in this embodiment, the impeller 200 can play a secondary reinforcing role, and can also realize centering anchoring, so as to enhance the anchoring effect, and further has an anti-falling function; grouting is carried out on the anchor cable hole 700 through the grouting pipe 300, and the slurry expands towards the cracks, so that the aim of enhancing the strength of broken surrounding rock can be achieved; the serpentine tail of the steel strand 100 can sufficiently stir the anchoring agent, and simultaneously, the anchoring area between the anchoring agent and the end of the steel strand 100 and the bottom of the anchor cable hole 700 is increased, so that the anchoring force is increased; the resistance maintaining assembly 500 can enable the anchor cable device to maintain constant working resistance while adapting to the large deformation of the surrounding rock of the roadway. That is, the anchor cable device provided by the embodiment can simultaneously meet the functions of constant supporting resistance, large deformation adaptation, centering anchoring, end anchoring reinforcement, drop prevention and grouting surrounding rock reinforcement in the anchor cable supporting process, and is suitable for supporting a soft rock large-deformation roadway under complex geological conditions of deep coal mines.

The embodiment also provides an anchor cable device anchoring method, which is applied to the anchor cable device and comprises the following steps:

constructing anchor cable holes 700 to the design depth;

reaming the orifice of the anchor cable hole 700, and matching the depth and the cross-sectional size of the reaming section 710 with the size of the constant resistance element 520;

placing an anchoring agent into the anchor cable hole 700, and propping the anchoring agent to the bottom of the anchor cable hole 700 by using the steel strand 100; more specifically, the twisted wire 100 is rotated counterclockwise while being advanced, and after reaching the installation depth, the twisted wire 100 is rotated counterclockwise so that the blades of the impeller 200 are embedded in the surrounding rock;

installing the constant resistance element 520 to the reaming section 710 of the anchor line bore 700;

after the tail of the steel strand 100 is anchored, the steel strand 100 is pre-tensioned through the fixing assembly 600, and the pre-tensioning force is smaller than the maximum resistance provided by the resistance maintaining assembly 500;

cement slurry is injected into the anchor cable hole 700 through the grouting pipe 300 as required and is solidified, specifically, grouting is stopped after grouting pressure reaches design requirements.

Finally, it is further noted that relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to the embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. The anchor cable device is characterized by comprising a steel strand (100), wherein the tail part of the steel strand (100) can be anchored to surrounding rock through an anchoring agent, and the outer end of the steel strand (100) can be fixed to the surrounding rock through a fixing assembly (600); the steel strand wires (100) are provided with at least one impeller (200) along its extending direction, impeller (200) cover is located outside steel strand wires (100), impeller (200) can pack into anchor rope hole (700), just the diameter of impeller (200) is greater than anchor rope hole (700) aperture.

2. The anchor cable assembly of claim 1, wherein one of the impellers (200) is disposed outside the steel strand (100), and the impeller (200) is disposed between a middle portion of the steel strand (100) and a tail portion of the steel strand (100).

3. The anchor cable device according to claim 2, wherein the impeller (200) is fixedly sleeved outside the steel strand (100), and a rotation direction of a blade of the impeller (200) is opposite to a rotation direction of the steel strand (100) when the steel strand (100) is installed.

4. A cable bolt arrangement according to any one of claims 1-3, further comprising a grouting pipe (300), the grouting pipe (300) being extendable into the cable aperture (700) through a conduit aperture of the securing assembly (600) for grouting into the cable aperture (700); the steel strand (100) is provided with an exhaust hole (110) which is communicated with the anchor cable hole (700) and the outside.

5. The anchor cable arrangement according to claim 4, characterized in that the tail of the steel strand (100) is serpentine or fixedly provided with serpentine stirring elements (400) for stirring the anchoring agent.

6. The cable bolt arrangement of claim 4, further comprising a resistance retaining assembly (500), the resistance retaining assembly (500) comprising a slider (510) and a constant resistance member (520); the constant resistance piece (520) is provided with a hollow cavity penetrating through the outer walls of the two ends of the constant resistance piece along the axial direction of the constant resistance piece, and the constant resistance piece (520) can be arranged on a reaming section (710) of an orifice of the anchor cable hole (700) and sleeved outside the steel strand (100); the inner wall of the hollow cavity is provided with a constant-resistance structure, the sliding block (510) is fixedly connected with the steel strand (100), and the sliding block (510) can move towards a direction far away from an orifice of the anchor cable hole (700) after overcoming the resistance of the constant-resistance structure; the maximum resistance provided by the constant resistance structure is greater than the pretightening force of the anchor cable device and less than the breaking force of the steel strand (100).

7. The anchor cable assembly of claim 6, wherein the constant resistance structure extends circumferentially along the inner wall of the hollow cavity and is uniformly disposed axially along the constant resistance member (520).

8. The anchor cable assembly of claim 6, wherein the constant resistance structure includes constant resistance teeth (521), and the side walls of the constant resistance teeth (521) adjacent to the sliding block (510) are perpendicular to the inner wall of the hollow cavity or inclined to the side of the sliding block (510).

9. The cable bolt arrangement of claim 6, wherein the securing assembly (600) includes a lock (610) and a tray (620), the lock (610) being threadably connected to the steel strand (100) and pushing the slider (510) into contact with the constant resistance structure; the tray (620) is fixedly sleeved outside the lock (610) and is used for being abutted with the rock wall to provide pretightening force.

10. A method of anchoring a cable arrangement according to any one of claims 4 to 9, the method comprising the steps of:

constructing anchor cable holes (700) to a design depth;

reaming the orifice of the anchor cable hole (700) and matching the depth and the section size of the reaming section (710) with the size of the constant resistance piece (520);

placing the anchoring agent into the anchor cable hole (700), and propping the anchoring agent to the bottom of the anchor cable hole (700) by using the steel stranded wire (100);

installing the constant resistance element (520) to a reaming section (710) of the anchor line bore (700);

after the tail of the steel strand (100) is anchored, the steel strand (100) is pre-tensioned through the fixing assembly (600), and the pre-tensioning force is smaller than the maximum resistance provided by the resistance maintaining assembly (500);

cement slurry is injected into the anchor cable holes (700) through the grouting pipes (300) as required and is solidified.