CN218177254U - Mining hollow grouting anchor cable - Google Patents

Abstract

The utility model relates to a mining hollow grouting anchor cable, which comprises a cable body, wherein the cable body comprises a central core steel pipe and a thin-wall threaded steel pipe which are coaxially fixedly connected and communicated, and a cable body core formed by the central core steel pipe and the thin-wall threaded steel pipe is wound with a steel wire; the end, far away from the thin-walled threaded steel pipe, of the center core steel pipe is fixedly connected with a grouting joint, the thin-walled threaded steel pipe extends to the tail end of the cable body through a grouting anchoring section, a plurality of grout outlet holes located in the grouting anchoring section are formed in the pipe wall of the thin-walled threaded steel pipe, the tail end of the cable body is fixedly connected with an anchoring agent stirring claw for plugging an inner hole of the thin-walled threaded steel pipe, and a plurality of stirring teeth which are distributed along the circumferential direction are fixedly arranged at one end, far away from the thin-walled threaded steel pipe, of the anchoring agent stirring claw. The utility model discloses a thin wall threaded steel pipe runs through at the cable body center, has solved and has adopted the multi-section pipe in the transportation or the in-process problem that takes place the disconnection of bending, and the steel wire around can not scurrying because of the disconnection of bending to need not shut down again in cable body processing establishment process and place the multi-section pipe.

Description

Mining hollow grouting anchor cable

Technical Field

The utility model relates to a mine tunnel is strutted or is consolidated with slip casting anchor rope technical field, especially involves the broken country rock that is applicable to mine tunnel, tunnel and struts or the reinforced (rfd) cavity slip casting anchor rope.

Background

The hollow grouting anchor cable can realize full-length anchoring and grouting reinforcement of surrounding rocks of the roadway, and is widely applied to coal mine roadway support in recent years. The construction process of the hollow grouting anchor cable comprises the following steps: firstly, using resin anchoring agent to anchor the end, then installing a grout stop plug, a tray and a rigging to perform tensioning and pre-tightening, after the designed pre-tightening force is reached, dismounting the tensioning machine, grouting into the drill hole, and stopping grouting after the grouting pressure reaches a certain value. As seen from the construction process, the cable body can be divided into three parts which are respectively as follows from outside to inside: a tensioning pre-tightening section, a grouting anchoring section and a resin anchoring section. The tensioning and pre-tightening section of the cable body cannot be extruded and contracted, otherwise, the anchorage device slides downwards to reduce the pre-tightening force; the grouting anchoring section can be bent; the resin anchoring section can not shrink when being tensioned, otherwise, the cable body is separated from the anchoring agent, and the anchoring quality is influenced.

The utility model discloses a patent of "anchor annotates anchor rope", its application number: 200920226255.4, authorization publication number: CN201507318U. The cable body structure is that a plurality of steel wires are wound on a rigid core pipe, a flexible core pipe and an end anchor section core rod so as to meet different requirements of the hollow grouting anchor cable body. The flexible core pipe is a plastic pipe, inner holes in the wall thickness have small influence on the slurry passing area, the flexible core pipe is easy to age and leak out of a cable body, and the processing of the cable body by the three core pipes (rods) is complicated.

Utility model patent "a practical cavity slip casting anchor rope" application number 201521076588.5, grant bulletin number: CN 205206857U. The cable body structure is that prestressed spiral rib steel wires are wound on a high-strength seamless steel pipe and a round steel stay bar. The high-strength seamless steel pipe is used for replacing a rigid core pipe and a flexible core pipe, although the structure is simplified, the cable body cannot restore to the original state after being bent, the anchor cable conveyed to the underground is difficult to straighten, and the resistance is increased for installing and stirring resin for the anchor cable.

Disclosure of Invention

The utility model discloses to prior art's not enough, provide a mining cavity slip casting anchor rope, utilize the elasticity characteristics that thin wall threaded steel pipe has, can return straight after the bending along with the cable body, and avoided cable body center tube rupture.

The utility model is realized by the following technical scheme, a hollow grouting anchor cable for mining is provided, which comprises a cable body, wherein the cable body comprises a central core steel pipe and a thin-wall thread steel pipe which are coaxially fixedly connected and communicated, and a steel wire is wound on a cable body core formed by the central core steel pipe and the thin-wall thread steel pipe; the end, far away from the thin-walled threaded steel pipe, of the middle core steel pipe is fixedly connected with a grouting joint, the thin-walled threaded steel pipe extends to the tail end of the cable body through a grouting anchoring section, a plurality of slurry outlet holes located in the grouting anchoring section are formed in the pipe wall of the thin-walled threaded steel pipe, the tail end of the cable body is fixedly connected with an anchoring agent stirring claw for plugging an inner hole of the thin-walled threaded steel pipe, a plurality of stirring teeth which are distributed along the circumferential direction are fixedly arranged at one end, far away from the thin-walled threaded steel pipe, of the anchoring agent stirring claw, and each stirring tooth surrounds a fixing cavity matched with the resin anchoring agent.

According to the scheme, the stirring teeth are arranged to form the fixing cavity, so that the anchoring agent is conveniently and fixedly installed, the resin anchoring agent is ensured to be conveyed to the bottom of the hole, the resin anchoring agent is conveniently stirred, and meanwhile, the anchoring agent stirring claw also plays a role in plugging the thin-wall threaded steel pipe; the deformation and straightening along with the cable body are realized by arranging the thin-wall threaded steel pipe penetrating through the grouting anchoring section; through setting up the slip casting joint, make things convenient for the slip casting, the thick liquid flows to in the thin wall screw-thread steel pipe along well core steel pipe to flow out from the grout outlet, realize the slip casting anchor after solidifying.

Preferably, a conical plug extending forwards to an inner hole of the thin-wall threaded steel pipe is further fixedly arranged on the stirring claw, and the diameter of the front end of the conical plug is smaller than that of the rear end of the conical plug. This optimization scheme is through setting up the toper plug, more conveniently guarantees that stirring claw and thin wall threaded steel pipe are coaxial, utilizes the toper setting of plug simultaneously, has improved the reliability to the shutoff of thin wall threaded steel pipe.

Preferably, a fixing ring is sleeved outside the joint of the stirring claw and the cable body, and the stirring claw and the cable body are fixedly connected through the fixing ring. This optimization scheme will stir claw and cable body rigid coupling through solid fixed ring, simple structure, the assembly degree of difficulty is little.

Preferably, the cable body is fixedly sleeved with a resin support positioned between the grouting anchoring section and the resin anchoring section, and the outer diameter of the resin support is matched with the drilled hole. This optimization scheme is held in the palm through setting up the resin, prevents that resin anchoring agent from flowing out resin anchoring section to improve resin anchoring agent's closely knit degree, be favorable to guaranteeing simultaneously that the cable body is placed in the middle in the anchor eye.

Preferably, the thin-wall threaded steel pipe is fixedly sleeved with a support ring positioned on one side of the slurry outlet hole, the support ring is positioned on the inner side of the steel wire, and the outer diameter of the cable body at the position of the support ring is 2-5mm smaller than the diameter of the drilled hole. The setting of this optimization scheme support ring outwards struts the cable body steel wire, makes the thick liquid can flow from between the steel wire gap better, ensures the reliability of anchor.

Preferably, the inner wall of the support ring is provided with threads matched with the thin-wall threaded steel pipe, the outer wall of the support ring is provided with grooves matched with the cable body steel wires, and a bulge matched with the gap between every two adjacent cable body steel wires is formed between every two adjacent grooves. The setting of this optimization scheme has guaranteed the fixed reliability of support ring, avoids the support ring to take place to shift when the cable body is crooked.

Preferably, the support ring comprises two half-ring bodies arranged oppositely, and the two half-ring bodies are fixedly connected through bolts. This optimization scheme sets up the support ring into two half ring bodies, more conveniently installs the support ring on thin wall threaded steel pipe to assembly efficiency has been improved by a wide margin.

As optimization, the inner hole of one end of the grouting joint, which is far away from the central core steel pipe, is connected with a plug through threads. This optimization scheme prevents the thick liquid outflow through setting up the plug.

Optimally, the wall thickness of the thin-wall threaded steel pipe is 0.15-1mm. The wall thickness setting of this optimization scheme has both guaranteed threaded steel pipe's intensity, has guaranteed simultaneously that threaded steel pipe has certain flexibility and resilience performance, bends and returns the straight along with the cable body better.

The beneficial effects of the utility model are that:

1. the thin-wall threaded steel pipe penetrates through the center of the cable body, so that the problem that the multi-section pipe is disconnected in the transportation or bending process is solved, the central pipe cannot break off peripheral steel wires due to bending, and the multi-section pipe does not need to be stopped to be placed in the cable body processing and weaving process;

2. the use performance of the anchor cable is ensured by utilizing the characteristics of no rust and no aging of the thin-wall threaded steel pipe;

3. the stirring claw is arranged, so that the installation of the resin anchoring agent does not occur in a parallel state with the cable body any more, and the resin anchoring agent is prevented from being extruded on one side of the cable body;

4. by arranging the resin support, the resin is prevented from flowing downwards, the grout outlet is blocked, the compactness of the resin anchoring agent is improved, and meanwhile, the cable body is kept in the middle in the anchor hole;

5. by arranging the support ring, the number of the protrusions on the support ring is the same as that of the steel wires on the periphery of the cable body, the steel wires can be fixed better, the gap between every two steel wires is the same, and the steel wires cannot deviate in the bending process; the inside of the support ring is provided with threads matched with the threaded steel pipe, and the support ring is installed in a two-flap buckling mode and can be fixed in the middle of a group of grout outlet holes without sliding.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic view of the resin anchoring section of the present invention;

FIG. 3 is an enlarged view taken at point I in FIG. 1;

FIG. 4 is an enlarged view taken at II in FIG. 1;

FIG. 5 is an enlarged view of FIG. 1 at III;

FIG. 6 is a schematic cross-sectional view of a resin holder;

FIG. 7 is an isometric view of a stirring claw.

Shown in the figure:

1. the anchor agent stirring claw comprises 2 parts of an anchor agent stirring claw, 3 parts of a resin support, 3 parts of a thin-wall threaded steel pipe, 4 parts of a central steel pipe, 5 parts of a tray, 6 parts of an anchor, 7 parts of a cable body, 8 parts of a grouting joint, 9 parts of a steel wire, 10 parts of a fixing ring, 11 parts of a stirring tooth, 12 parts of a conical plug, 13 parts of a support ring, 14 parts of a grout outlet, 15 parts of a pressure pipe, 16 parts of a plug, 17 parts of a bulge.

Detailed Description

In order to clearly illustrate the technical features of the present solution, the present solution is explained below by way of specific embodiments.

As shown in fig. 1, the mining hollow grouting anchor cable comprises an anchor 6, a tray 5, a grout stop plug and a cable body 7, wherein the anchor 6, the tray 5 and the grout stop plug all adopt the prior art.

The cable body 7 comprises a central core steel pipe 4 and a thin-wall threaded steel pipe 3 which are coaxially fixedly connected and communicated, the wall thickness of the thin-wall threaded steel pipe is 0.15-1mm, the thin-wall threaded steel pipe is made of an antirust material, the thin-wall threaded steel pipe is not rusted and aged after being placed for a long time, the diameter of the central slurry passing through the pipe is large, the thin-wall threaded steel pipe is flexible, and the cable body can restore to a normal state after being bent. The steel wire 9 is wound on a cable core formed by the central core steel pipe 4 and the thin-wall threaded steel pipe 3, and the central core steel pipe 4 and the thin-wall threaded steel pipe 3 are fixed in a compression joint mode through a compression pipe 15.

And one end of the central steel pipe, which is far away from the thin-wall threaded steel pipe, is fixedly connected with a grouting joint 8, and the grouting joint is used for connecting a grouting pipeline to perform grouting on the cable body on one hand and is used for connecting a stirrer to perform resin stirring on the other hand. The inner hole of one end, far away from the central core steel pipe, of the grouting joint is connected with a screw plug 16 through threads, the screw plug is detached during grouting, the grouting joint is connected with a grouting pipeline, and after grouting is finished, the screw plug is installed at the grouting end of the grouting joint and used for plugging grout, so that the grout can be prevented from flowing backwards from a grouting opening after grouting is finished.

The thin-wall threaded steel pipe extends to the tail end of the cable body through the grouting anchoring section, a plurality of slurry outlet holes 14 located in the grouting anchoring section are formed in the pipe wall of the thin-wall threaded steel pipe, in order to ensure that slurry flowing out of the slurry outlet holes flows out through the steel wires, a support ring 13 located on one side of each slurry outlet hole is fixedly sleeved on the thin-wall threaded steel pipe, the support ring 13 is located on the inner side of each steel wire, the support ring is used for outwards strutting the outer steel wires in an expanding mode, and therefore the slurry can flow out from gaps between the steel wires. The outer diameter of the cable body at the support rings is 2-5mm smaller than the diameter of the drilled hole, and a group of slurry outlet holes are formed in the two sides of each support ring. The inner wall of the support ring is provided with threads matched with the thin-wall threaded steel pipe, the outer wall of the support ring is provided with grooves matched with the cable body steel wires, and a bulge 17 matched with the gap between every two adjacent cable body steel wires is formed between every two adjacent grooves. In order to facilitate the installation of the support ring, the support ring of the embodiment includes two half-ring bodies arranged oppositely, and the two half-ring bodies are fixedly connected by bolts.

The tail end of the cable body is fixedly connected with an anchoring agent stirring claw 1 for plugging an inner hole of the thin-wall threaded steel pipe, one end of the anchoring agent stirring claw, which is far away from the thin-wall threaded steel pipe, is fixedly provided with a plurality of stirring teeth 11 which are arranged along the circumferential direction, and each stirring tooth surrounds a fixing cavity matched with the resin anchoring agent and is used for jacking the resin anchoring agent, so that the end part of the resin anchoring agent is surrounded among all the teeth, and the resin anchoring agent is prevented from being extruded on one side of the cable body and being incapable of being conveyed to the bottom of a drilled hole. The stirring claw is also fixedly provided with a conical plug 12 which extends forwards to the inner hole of the thin-wall threaded steel pipe, and the diameter of the front end of the conical plug 12 is smaller than that of the rear end, so that the thin-wall threaded steel pipe is better plugged, and slurry cannot flow out from the inner hole of the thin-wall threaded steel pipe. The middle part of the stirring claw is cylindrical, the size of the outer cylinder is consistent with the outer diameter of the cable body, when the conical plug of the stirring claw is completely inserted into the inner hole of the thin-wall threaded steel pipe, the end part of the cylinder is just in contact with the peripheral steel wire of the cable body, the cable body and the cylindrical part are tightly pressed by the fixing ring 10 at the moment, namely the fixing ring 10 is sleeved outside the joint of the stirring claw and the cable body, and the stirring claw and the cable body are fixedly connected through the fixing ring 10.

A resin support 2 positioned between the grouting anchoring section and the resin anchoring section is fixedly sleeved on the cable body, the distance between the resin support 2 and the stirring claw is 1.5 to 2 meters, the outer diameter of the resin support is matched with the drilled hole, the resin is prevented from flowing downwards, the compactness of the resin anchoring agent is improved, and a grout outlet is blocked; keeping the cable body centered in the anchor hole.

During the use, install resin anchoring agent on the stirring tooth, utilize the cable body to send into the resin anchoring agent into the hole bottom to stir, realize the end anchor, then carry out the slip casting through slip casting joint, the thick liquid flows out through the grout outlet, and through the gap outflow between the steel wire, installs the plug after the slip casting is ended, avoids the thick liquid refluence, accomplishes the anchor after the thick liquid solidifies. The structure of the cable body and the end anchor stirring of the embodiment is more reasonable, and the cable body processing and the underground construction are facilitated.

Of course, the above description is not limited to the above examples, and technical features of the present invention that are not described in the present application may be implemented by or using the prior art, and are not described herein again; the above embodiments and drawings are only used for illustrating the technical solutions of the present invention and are not intended to limit the present invention, and the present invention has been described in detail with reference to the preferred embodiments, and those skilled in the art should understand that changes, modifications, additions or substitutions made by those skilled in the art within the spirit of the present invention should also belong to the protection scope of the claims of the present invention.

Claims (9)

1. The utility model provides a mining cavity slip casting anchor rope, includes cable body (7), its characterized in that: the cable body (7) comprises a central core steel pipe (4) and a thin-wall threaded steel pipe (3) which are coaxially fixedly connected and communicated, and a steel wire (9) is wound on a cable body core formed by the central core steel pipe (4) and the thin-wall threaded steel pipe (3); the end, far away from the thin-walled threaded steel pipe, of the central steel pipe is fixedly connected with a grouting connector (8), the thin-walled threaded steel pipe extends to the tail end of the cable body through a grouting anchoring section, the pipe wall of the thin-walled threaded steel pipe is provided with a plurality of grout outlet holes (14) located in the grouting anchoring section, the tail end of the cable body is fixedly connected with an anchoring agent stirring claw (1) for plugging an inner hole of the thin-walled threaded steel pipe, one end, far away from the thin-walled threaded steel pipe, of the anchoring agent stirring claw is fixedly provided with a plurality of stirring teeth (11) distributed along the circumferential direction, and each stirring tooth surrounds a fixing cavity matched with the resin anchoring agent.

2. The mining hollow grouting anchor cable according to claim 1, characterized in that: and a conical plug (12) extending forwards to an inner hole of the thin-wall threaded steel pipe is fixedly arranged on the stirring claw, and the diameter of the front end of the conical plug (12) is smaller than that of the rear end.

3. The mining hollow grouting anchor cable according to claim 1, characterized in that: the outside cover of stirring claw and cable body junction is equipped with solid fixed ring (10), and the stirring claw passes through with the cable body gu fixed ring (10) rigid coupling.

4. The mining hollow grouting anchor cable according to claim 1, characterized in that: the cable body is sleeved with and fixed with a resin support (2) located between the grouting anchoring section and the resin anchoring section, and the outer diameter of the resin support is matched with the drilled hole.

5. The mining hollow grouting anchor cable according to claim 1, characterized in that: the thin-wall threaded steel pipe is fixedly sleeved with a support ring (13) located on one side of the grout outlet, the support ring (13) is located on the inner side of the steel wire, and the outer diameter of the cable body at the support ring is 2-5mm smaller than the diameter of the drilled hole.

6. The mining hollow grouting anchor cable according to claim 5, characterized in that: the inner wall of the support ring is provided with threads matched with the thin-wall threaded steel pipe, the outer wall of the support ring is provided with grooves matched with the cable body steel wires, and a bulge (17) matched with the gap between every two adjacent cable body steel wires is formed between every two adjacent grooves.

7. The mining hollow grouting anchor cable according to claim 6, characterized in that: the support ring comprises two semi-ring bodies which are arranged oppositely, and the two semi-ring bodies which are opposite are fixedly connected through bolts.

8. The mining hollow grouting anchor cable according to claim 1, characterized in that: the inner hole of one end of the grouting joint, which is far away from the central core steel pipe, is connected with a plug (16) through threads.

9. The mining hollow grouting anchor cable according to claim 1, characterized in that: the wall thickness of the thin-wall threaded steel pipe is 0.15-1mm.

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