A mine-used hollow grouting constant resistance anchor cable without reaming

Abstract

This utility model discloses a non-expansion type hollow grouting constant resistance anchor cable for mining, including a sliding extrusion device, a variable diameter metal cylinder, a cable body, an anchor cable tray, a grout stopping device, and a grout outlet device. One end of the variable diameter metal cylinder is a variable diameter section, and the other end is an extension section, which serves as the cable body. The cable body is fixed to the top of the anchor cable body borehole and is equipped with a grout outlet device. A grout stopping device is provided between the outer surface of the cable body and the inner sidewall of the anchor cable body borehole. The anchor cable tray is sleeved on the cable body, and the sliding extrusion device is sleeved on the variable diameter section of the variable diameter metal cylinder below the anchor cable tray. When the anchor cable tray is under force, the sliding extrusion device extrudes the variable diameter section of the variable diameter metal cylinder, providing constant resistance to the anchor cable. It can achieve constant resistance and large deformation anchor cable without borehole expansion, can deform greatly, work in a constant resistance state, can be retracted, and meets the support requirements of grouting. It also has the characteristics of simple structure, high efficiency, light weight, easy installation, good economy, and eliminating the damage to the surrounding rock caused by grouting and drilling.

Description

Technical Field

[0001] This utility model belongs to the field of constant resistance anchor cable technology, and specifically relates to a mining-use non-expanded hollow grouting constant resistance anchor cable. Background Technology

[0002] Constant-resistance large-deformation anchor cables have been widely used in the support of the roof of gob-side retaining roadways in the 110 method. When the surrounding rock pressure of the roof in the gob-side retaining roadway is high, the roof rock will move downwards and squeeze the flat tray of the constant-resistance large-deformation anchor cable. This causes the flat tray to drive the constant-resistance device to slide downwards along the cable body. During the downward sliding of the constant-resistance device, the locking device with an internal lock core installed at the tail of the anchor cable body prevents the constant-resistance device from sliding down, generating friction. The friction force is transmitted to the constant-resistance device, which then transmits the frictional resistance force to the surrounding rock through the flat tray. This generates upward support resistance to the roof during the subsidence of the surrounding rock, thereby reducing the amount of roof subsidence and controlling the deformation of the roof in the gob-side retaining roadway and ensuring safety. Existing constant-resistance large-deformation anchor cables mainly use constant-resistance devices to achieve slip extension of the anchor cable under high pressure.

[0003] The method primarily relies on wedge-shaped locking devices to overcome the friction provided by the textured surface of the constant resistance device to achieve a constant resistance value. The constant resistance device then drives the small and flat trays to slide downwards, allowing for large deformation extension of the anchor cable. The main problems with this method are: the constant resistance device has an outer diameter of 88mm, which is 66mm larger than the 32mm anchor cable hole. This requires enlarging the lower 500mm long 32mm anchor cable hole to a diameter of 95mm-100mm. Due to the excessively large hole diameter, there is a lack of specialized drilling equipment, and the slow construction speed affects the installation speed, leading to frequent changes in drilling equipment and a cumbersome construction process. Under pressure, during extension, the locking device may completely enter the constant resistance device, preventing it from retracting and thus preventing the constant resistance anchor cable from eliminating its working capacity. In goaf-side roadways, this inability to eliminate its support function makes it difficult for the roof to collapse, easily causing overhanging roofs at the working face end, leading to gas accumulation and violating coal mine safety regulations. Constant resistance anchors are large in diameter and heavy, making installation extremely difficult for workers, hindering labor efficiency and posing potential safety hazards. This is particularly true for roadways with high pressure and dense constant resistance anchor support, resulting in a massive workload, complex procedures, and low efficiency. The large diameter and weight of the constant resistance anchors, made of high-quality steel, require a large quantity of expensive steel, leading to high support costs and poor economic efficiency, which is detrimental to achieving the cost reduction and efficiency improvement goals promoted in the coal mining industry. Furthermore, when constant resistance anchors undergo deformation due to pressure relief, creating numerous cracks in the surrounding rock requiring immediate grouting reinforcement, grouting cannot be performed using constant resistance anchors. Instead, new grouting anchors or pipes must be installed, complicating the process and delaying the grouting timing. The water used during drilling further softens the surrounding rock, exacerbating roadway rock damage and increasing roadway deformation. Utility Model Content

[0004] The purpose of this utility model is to provide a non-expanded hollow grouting constant resistance anchor cable for mining, so as to solve the problems of complex process, high cost and low installation efficiency of the existing technology.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A mining-grade, non-expanding, hollow grouting constant-resistance anchor cable includes a sliding extrusion device, a variable-diameter metal cylinder, a cable body, an anchor cable tray, a grout-stopping device, and a grout outlet device. One end of the variable-diameter metal cylinder is a variable-diameter section, and the other end is an extension section, which serves as the cable body. The cable body is fixed to the top of the borehole of the anchor cable body and is equipped with a grout outlet device. A grout-stopping device is installed between the outer surface of the cable body and the inner wall of the borehole of the anchor cable body. The anchor cable tray is fitted onto the cable body, and the sliding extrusion device is fitted onto the variable-diameter section of the variable-diameter metal cylinder below the anchor cable tray. When the anchor cable tray is under force, the sliding extrusion device extrudes the variable-diameter section of the variable-diameter metal cylinder, providing constant resistance to the anchor cable.

[0007] Furthermore, the variable diameter metal cylinder includes a small-diameter cylindrical cylinder, a variable-diameter frustum cylinder, and a large-diameter cylindrical cylinder, which sequentially form an integral structure of the variable diameter metal cylinder; the small-diameter cylindrical cylinder is an extension section, and the large-diameter cylindrical cylinder is a variable-diameter section; the sliding extrusion device is sleeved at the connection between the small-diameter cylindrical cylinder and the variable-diameter frustum cylinder of the variable diameter metal cylinder.

[0008] Furthermore, steel strands are wound around the outside of the variable-diameter metal cylinder to form a composite structure.

[0009] Furthermore, the sliding compression device includes an anchor cable lock and a lock core clip, with the anchor cable lock sleeved on the outside of the cable body and several lock core clips disposed between the inner surface of the anchor cable lock and the outer surface of the cable body.

[0010] Furthermore, several lock cylinder clips are combined to form a hollow cone shape. Each lock cylinder clip is provided with a lock cylinder threaded collar, and a steel wire is provided on the lock cylinder threaded collar for fastening the hollow cone shape formed by the combination.

[0011] Furthermore, both the inner surface of the anchor cable lock and the inner surface of the lock cylinder clip are provided with inner wall protrusions and recesses.

[0012] Furthermore, the grout-stopping device includes an expandable grout-stopping hose 13 and a limiting grout-stopping rigid tube 14. Both the expandable grout-stopping hose 13 and the limiting grout-stopping rigid tube 14 are sleeved on the outside of the cable body, and the limiting grout-stopping rigid tube 14 is located below the expandable grout-stopping hose 13, serving a supporting function.

[0013] Furthermore, the grout discharge device includes grout discharge holes and plastic rings. Several grout discharge holes are arranged in a ring on the cable body. The plastic rings support the anchor cable body boreholes at the grout discharge holes to form cable body protrusions for grout discharge from the grout discharge holes.

[0014] Furthermore, the cable body is fixed to the top of the anchor cable body borehole using a resin anchoring agent.

[0015] Furthermore, the tail end of the variable diameter metal cylinder is provided with anchor cable tail threads, and the anchor cable tail threads are provided with grouting port sealing nut caps.

[0016] Compared with the prior art, the present invention has the following technical effects:

[0017] This invention features an alloy structural component within the anchor cable body, comprising a continuous upper small-diameter cylindrical tube, a middle wedge-shaped frustum cylinder, and a lower enlarged-diameter cylindrical tube. Under the circumferential pressure of the anchor cable locking device and lock core, this structural component causes the middle wedge-shaped frustum cylinder and the lower enlarged-diameter cylindrical tube to undergo a certain amount of deformation and diameter reduction. The compressive force required during the diameter reduction process provides constant resistance to the anchor cable, while the sliding range of the locking device and lock core after the diameter reduction provides large deformation elongation of the anchor cable. Simultaneously, the tail end can serve as a grouting port, and the front end of the upper small-diameter cylinder has multiple grout outlets, creating a grouting anchor cable. This design enables constant resistance and large deformation anchor cables without the need for borehole enlargement, allowing for large deformation, constant resistance operation, anchor retraction, and accommodating grouting support requirements. It also features a simple structure, high efficiency, light weight, easy installation, good economy, and eliminates the damage to surrounding rock caused by grouting drilling. Attached Figure Description

[0018] Figure 1 Design drawing of the main structure of the mining-use non-expanded hollow grouting constant resistance anchor cable.

[0019] Figure 2 Structural diagram of a non-expanded hollow grouting constant resistance anchor cable for mining before elongation.

[0020] Figure 3 Structural diagram of a non-expanded hollow grouting constant resistance anchor cable after elongation in mining applications.

[0021] Figure 4 Diagram of the upper grout outlet structure of a non-expanded hollow grouting constant resistance anchor cable for mining.

[0022] Figure 1 1. Cable body, 2. Resin anchoring agent, 3. Anchor cable body drill hole, 4. Anchor cable tray, 5. Anchor cable lock, 6. Inner wall concave-convex body, 7. Lock core clamp, 9. Lock core threaded collar, 10. Variable diameter metal cylinder, 11. Anchor cable tail thread, 12. Grouting port sealing nut cap, 13. Expandable grout-stopping hose, 14. Limiting grout-stopping rigid tube, 15. Grout outlet, 16. Cable body protrusion, 17. Plastic ring. Detailed Implementation

[0023] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0024] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are used only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0025] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0026] Example 1: This utility model provides a mining-grade, non-expanding, hollow grouting constant-resistance anchor cable, comprising a sliding extrusion device, a variable-diameter metal cylinder 10, a cable body 1, an anchor cable tray 4, a grout-stopping device, and a grout outlet device; one end of the variable-diameter metal cylinder 10 is a variable-diameter section, and the other end is an extension section, the extension section serving as the cable body 1, the cable body 1 being fixed to the top of the anchor cable body borehole and equipped with a grout outlet device; a grout-stopping device is provided between the outer surface of the cable body 1 and the inner sidewall of the anchor cable body borehole; the anchor cable tray 4 is sleeved on the cable body 1, and a sliding extrusion device is sleeved on the variable-diameter section of the variable-diameter metal cylinder 10 below the anchor cable tray 4; when the anchor cable tray 4 is subjected to force, the sliding extrusion device extrudes the variable-diameter section of the variable-diameter metal cylinder 10, providing constant resistance to the anchor cable.

[0027] This utility model provides a constant resistance large deformation anchor cable for mining with grouting function. This device can not only meet the support requirements of no hole enlargement, large deformation, constant resistance operation, anchor retraction and grouting, but also has the characteristics of simple structure, high efficiency, light weight, easy installation, good economy and timely grouting to reinforce the surrounding rock.

[0028] Example 2: This utility model provides a mining-grade hollow grouting constant resistance anchor cable without hole expansion, including a sliding extrusion device, a variable diameter metal cylinder 10, a cable body 1, an anchor cable tray 4, a grout stopping device, and a grout discharge device. One end of the variable-diameter metal cylinder 10 is a variable-diameter section, and the other end is an extension section. The extension section serves as the cable body 1. One end of the cable body 1 is fixed to the top of the anchor cable borehole 3 in the deep, stable surrounding rock by a resin anchoring agent, and is equipped with a grouting device (including several grouting holes 15 arranged in a ring on the cable body 1 and a plastic ring 17 that supports the borehole at the grouting hole 15 to form a grouting cavity). The other end is fixedly connected to the variable-diameter metal cylinder 10, which is composed of a small-diameter cylindrical cylinder, a variable-diameter frustum cylinder, and a large-diameter cylindrical cylinder connected in sequence. The interior of the variable-diameter metal cylinder 10 is connected to the grouting device on the cable body 1, and its tail is equipped with an anchor cable tail thread 11 and a grouting port sealing nut cap 12. A grout-stopping device (including a grouting device sleeved on the cable body 1) is provided between the outer side of the cable body 1 and the inner wall of the borehole 3. The expandable grout-stopping hose 13 is mounted on top of the cable body 1, and the limiting grout-stopping rigid pipe 14 below it provides support. The anchor cable tray 4 is fitted onto the cable body 1 and is close to the roadway roof. A sliding compression device is fitted onto the variable diameter metal cylinder 10 below it, including an anchor cable lock 5 fitted outside the cable body 1 and several lock core clips 7 placed between the inner surface of the lock 5 and the outer surface of the cable body 1. The lock core clips 7 are assembled into a hollow cone shape and are fastened as a whole by steel wire on the lock core threaded collar 9. The inner surface of the anchor cable lock 5 and the inner surface of the lock core clips 7 are provided with inner wall concave and convex parts 6. The sliding compression device is fitted at the connection between the small diameter cylindrical tube and the variable diameter frustum tube of the variable diameter metal cylinder 10. The outer side of the small diameter cylindrical tube can be firmly fixed to the cable body 1 by grooves combined with adhesive or external threads. Its length is determined according to the anti-slip force requirements.

[0029] This invention features an alloy structural component within the anchor cable body, comprising a continuous upper small-diameter cylindrical section, a middle wedge-shaped frustum cylinder, and a lower enlarged-diameter cylindrical section. Under the circumferential pressure of the anchor cable locking device and lock core, this structural component causes a certain amount of deformation and diameter reduction in the middle wedge-shaped frustum cylinder and the lower enlarged-diameter cylindrical section. The constant resistance of the anchor cable is provided by the compressive force required during the diameter reduction process, while the large deformation elongation of the anchor cable is provided by the sliding range of the locking device and lock core after the diameter reduction. Simultaneously, the tail end can serve as a grouting port, and the upper small-diameter cylindrical section has multiple grout outlets at its front end, enabling grouting of the anchor cable.

[0030] Working principle of this utility model:

[0031] (1) First, a rock drill bit is used to drill a hole 3 in the cable body.

[0032] (2) Then, the resin anchoring agent is pushed into the top of the cable body 1 of the constant resistance large deformation anchor cable with the variable diameter metal cylinder 10 installed at the tail. Then, the cable body 1 of the constant resistance large deformation anchor cable is rotated by the anchor drilling machine to stir the resin anchoring agent to form the resin anchoring agent solid 2. The top of the cable body 1 of the constant resistance large deformation anchor cable is fixed in the deep stable surrounding rock by the bonding effect of the resin anchoring agent solid 2.

[0033] (3) Then, the perforated flat tray 4 is placed on the tail of the constant resistance large deformation anchor cable body 1, which is equipped with a variable diameter metal cylinder 10. First, the expandable grout-stopping hose 13 is installed, then the limiting grout-stopping hard tube 14 is installed, and then the matching lock 5 and lock core clip 7 are installed. The lock core clip 7 is tied with steel wire through the lock core threaded collar 9 on the lock core clip 7, so that the lock core clip 7 forms a whole. The limiting grout-stopping hard tube 14 mainly serves to push the expandable grout-stopping hose 13 to a certain height in the hole, so as to prevent the grout pressure from squeezing out the expandable grout-stopping hose 13 and losing the sealing effect. During the process of the limiting grout-stopping hard tube 14 limiting the expansionable grout-stopping hose 13 and not moving down, the expandable grout-stopping hose 13 is compressed and radially expanded during the downward squeezing of the grout, which squeezes the gap between the anchor cable and the hole wall to be compact.

[0034] (4) Then, the top of the tensioning jack is used to squeeze the wedge-shaped lock core clip 7 into the anchor cable lock 5, and push the anchor cable lock 5 and the lower end of the lock core clip 7 into the diameter change position in the middle of the variable diameter metal cylinder 10. The anchor cable lock 5 is locked by the diameter change protrusion in the middle of the variable diameter metal cylinder 10 and the lock core clip 5, so as to realize the anchor cable pretension lock.

[0035] (5) Then, remove the tensioning jack.

[0036] (6) After the constant resistance anchor cable is installed, as the roof of the goaf roadway sinks along the 110 construction method, the surrounding rock of the roof will squeeze the flat tray 4, causing the anchor cable lock 5 and the lock core clip 7 to slide down, and simultaneously squeeze the variable diameter protrusion in the middle of the variable diameter metal cylinder 10, so that the variable diameter protrusion in the middle of the variable diameter metal cylinder 10 is grouted to shrink the diameter to the anchor cable lock 5 and the lock core to continue to slide down.

[0037] (7) See Figure 2 and Figure 3As shown, during the gradual reduction of the diameter of the variable-diameter metal cylinder 10, the length of the upper small-diameter section of the variable-diameter metal cylinder 10 gradually increases, the middle variable-diameter section gradually moves downward, and the length of the lower larger-diameter section gradually decreases. Under the circumferential pressure of the anchor cable lock and the lock core, this structural component can cause a certain amount of deformation reduction in the diameter of the middle wedge-shaped frustum cylinder and the lower increased-diameter cylindrical cylinder. The constant resistance of the anchor cable is provided by the compressive force required during the diameter reduction of the metal cylinder, and the large deformation extension of the anchor cable is provided by the sliding amount of the anchor cable lock 5 and the lock core clamp 7 after the diameter reduction of the variable-diameter metal cylinder 10. Thus, the constant-resistance anchor cable can maintain a constant support resistance and undergo sliding extension during the stress process, realizing the function of constant resistance with pressure deformation.

[0038] (8) The variable diameter metal cylinder 10 consists of three parts: an upper cylinder with a smaller diameter, a middle truncated cone cylinder with a smaller diameter, and a lower cylinder with a larger diameter. The upper cylinder with a smaller diameter has grooves on its surface and is bonded to the anchor cable body 1 with a high-strength adhesive to form a whole, preventing the variable diameter metal cylinder 10 from slipping under force. The length of the upper cylinder with a smaller diameter is mainly determined by the required anti-slip force; the greater the anti-slip force, the longer the cylinder with a smaller diameter. The middle truncated cone cylinder with a smaller diameter is a transition part and is not bonded to the anchor cable body. It can deform freely and mainly serves as a guide to facilitate the entry of the lower cylinder with a larger diameter into the lock. The lower, larger diameter cylindrical tube is not bonded to the anchor cable body and can deform freely. Its outer diameter is theoretically calculated and can provide constant resistance to the anchor cable through the extrusion force required for its diameter reduction. The length of the lower, larger diameter cylindrical tube is the extension length of the anchor cable itself after the tension reaches the pre-tension value, ensuring that the lower end of the lock is pushed into the middle cylindrical tube by the jack just meets the design requirements of the tension pre-tension.

[0039] (9) When the constant resistance anchor cable undergoes a certain amount of extension deformation due to the reduction in diameter of the variable diameter metal cylinder 10, unscrew the grouting port sealing nut cap 12, connect the front end of the grouting pipeline to the threaded end of the anchor cable 11, and inject grout into the grouting variable diameter metal cylinder 10 through the hole at the tail end of the grouting variable diameter metal cylinder 10. When the grout reaches the grout outlet 15, the grout will exit along the grout outlet 15 and exit through the hole at the cable body protrusion 16 supported by the plastic ring 17. The grout will enter the gap between the anchor cable body 1 and the anchor cable body borehole 3 and be injected into the surrounding rock mass along the cracks on the borehole wall of the anchor cable body borehole 3.

[0040] (10) After grouting is completed, unscrew the grouting pipe and then screw the grouting port sealing nut 12 onto the anchor cable tail thread 11 to prevent grout leakage.

[0041] This anchor cable features an alloy structural component built into the lower section of the anchor body. This component consists of an upper small-diameter cylindrical section, a middle wedge-shaped frustum-shaped cylinder, and a lower enlarged-diameter cylindrical section. Under the circumferential pressure of the anchor lock and lock core, this structural component causes the middle wedge-shaped frustum-shaped cylinder and the lower enlarged-diameter cylindrical section to undergo a certain amount of deformation and diameter reduction. The constant resistance of the anchor cable is provided by the compressive force required during the diameter reduction process, while the large deformation elongation of the anchor cable is provided by the sliding range of the lock and lock core after the diameter reduction. Simultaneously, the tail end can serve as a grouting port, and the front end of the upper small-diameter cylinder has multiple grout outlets, making it a grouting anchor cable. This type of anchor cable can achieve the support requirements of constant resistance and large deformation without hole enlargement, large deformation capability, constant resistance operation, anchor retraction capability, and grouting capability. It also features a simple structure, high efficiency, light weight, easy installation, good economy, and grouting functionality.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A mining-grade, non-expanded, hollow grouting constant-resistance anchor cable, characterized in that, It includes a sliding extrusion device, a variable diameter metal cylinder (10), a cable body (1), an anchor cable tray (4), a grout stop device, and a grout discharge device; one end of the variable diameter metal cylinder (10) is a variable diameter section, and the other end is an extension section. The extension section serves as the cable body (1). The cable body (1) is fixed at the top inside the anchor cable body borehole and is equipped with a grout discharge device; a grout stop device is provided between the outer surface of the cable body (1) and the inner sidewall of the anchor cable body borehole; the anchor cable tray (4) is fitted on the cable body (1). A sliding extrusion device is fitted on the variable diameter section of the variable diameter metal cylinder (10) below the anchor cable tray (4). When the anchor cable tray (4) is under force, the sliding extrusion device extrudes the variable diameter section of the variable diameter metal cylinder (10) to provide constant resistance to the anchor cable.

2. The mining-grade non-expanded hollow grouting constant resistance anchor cable according to claim 1, characterized in that, The variable diameter metal cylinder (10) includes a small diameter cylindrical cylinder, a variable diameter frustum cylinder and a large diameter cylindrical cylinder, which are sequentially integrated into a single structure. The small diameter cylindrical cylinder is an extension section and the large diameter cylindrical cylinder is a variable diameter section. A sliding extrusion device is fitted at the connection between the small diameter cylindrical cylinder and the variable diameter frustum cylinder of the variable diameter metal cylinder (10).

3. A mining-grade, non-expanded, hollow grouting constant-resistance anchor cable according to claim 2, characterized in that, The outer side of the variable diameter metal cylinder (10) is wound with steel strands to form a composite structure.

4. The mining-grade non-expanded hollow grouting constant resistance anchor cable according to claim 1, characterized in that, The sliding compression device includes an anchor cable lock (5) and a lock core clip (7). The anchor cable lock (5) is sleeved on the outside of the cable body (1), and several lock core clips (7) are arranged between the inner surface of the anchor cable lock (5) and the outer surface of the cable body (1).

5. A mining-grade, non-expanded, hollow grouting constant-resistance anchor cable according to claim 4, characterized in that, Several lock cylinder clips (7) are combined to form a hollow cone shape. Each lock cylinder clip (7) is provided with a lock cylinder threaded collar (9). A steel wire is provided on the lock cylinder threaded collar (9) to fasten the hollow cone shape formed by the combination.

6. A mining-grade, non-expanded, hollow grouting constant-resistance anchor cable according to claim 5, characterized in that, The inner surface of the anchor cable lock (5) and the inner surface of the lock core clip (7) are provided with inner wall concave and convex parts (6).

7. A mining-grade, non-expanded, hollow grouting constant-resistance anchor cable according to claim 1, characterized in that, The grout-stopping device includes an expandable grout-stopping hose (13) and a limiting grout-stopping rigid tube (14). Both the expandable grout-stopping hose (13) and the limiting grout-stopping rigid tube (14) are sleeved on the outside of the cable body (1), and the limiting grout-stopping rigid tube (14) is located below the expandable grout-stopping hose (13) to provide support.

8. A mining-grade, non-expanded, hollow grouting constant-resistance anchor cable according to claim 1, characterized in that, The grout discharge device includes grout discharge holes (15) and plastic rings (17). Several grout discharge holes (15) are arranged in a ring on the cable body (1). The plastic rings (17) support the anchor cable body drill hole at the grout discharge hole (15) to form a cable body protrusion (16) for grout discharge from the grout discharge hole (15).

9. A mining-grade, non-expanded, hollow grouting constant-resistance anchor cable according to claim 1, characterized in that, The cable body (1) is fixed to the top of the anchor cable body borehole by resin anchoring agent.

10. A mining-grade, non-expanded, hollow grouting constant-resistance anchor cable according to claim 1, characterized in that, The tail of the variable diameter metal cylinder (10) is provided with an anchor cable tail thread (11), and the anchor cable tail thread (11) is provided with a grouting port sealing nut cap (12).

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