A constant resistance large deformation anchor cable without reaming for mine

Abstract

The utility model discloses a mine reaming type constant resistance big deformation anchor cable, including sliding extrusion device, variable diameter metal cylinder, cable body and anchor cable tray, one end of cable body is fixed in anchor cable body borehole top, the other end inboard fixedly set up with variable diameter metal cylinder, anchor cable tray is set up on cable body, and the sliding extrusion device is set up on the cable body below the anchor cable tray, when anchor cable tray stress, sliding extrusion device extrudes the variable diameter of variable diameter metal cylinder, provides the constant resistance of anchor cable. Constant resistance, rely on the big deformation extension of anchor cable that can be provided by the downslide amount of lock and lock core after metal cylinder contraction. It can realize the supporting requirement of constant resistance big deformation anchor cable without reaming, big deformation, constant resistance value state work, anchor withdrawal, and has the characteristics of simple structure, high efficiency, light weight, easy installation, good economy etc.

Description

Technical Field

[0001] This utility model belongs to the field of constant resistance anchor cable technology, and specifically relates to a mining-use constant resistance large deformation anchor cable without hole expansion. Background Technology

[0002] Constant-resistance large-deformation anchor cables have been widely used in the support of the roof of goaf-side roadways in the 110 method. When the pressure of the surrounding rock on the roof of the goaf-side roadway is high, the surrounding rock will move downward and squeeze the anchor tray of the constant-resistance large-deformation anchor cable. This causes the anchor tray to drive the constant-resistance device to slide downward 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 and generates friction. The friction force is transmitted to the constant-resistance device, and the constant-resistance device then transmits the frictional resistance force to the surrounding rock through the anchor 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 of the goaf-side 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. Its structure mainly relies on wedge-shaped locking devices to overcome the friction provided by the concave and convex textures inside the constant-resistance device to achieve a constant resistance value. The large deformation extension of the anchor cable is achieved by the constant-resistance device driving the small tray and the anchor tray to slide downward. 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, when extension occurs, the locking device will completely enter the constant resistance device, making it impossible to retract. This prevents the constant resistance anchor cable from eliminating its working capacity. In goaf-side roadways, because its support function cannot be eliminated, the roof is difficult to collapse, easily causing overhanging at the working face end, leading to gas accumulation and violating coal mine safety regulations. The large diameter and weight of the constant resistance device make installation very difficult for workers, hindering labor efficiency and easily creating construction safety hazards. Especially in roadways with high pressure and high density of constant resistance anchor cable support, the workload is extremely large, the operation process is complex, and the efficiency is low. Constant resistance resistors have large diameters and are heavy. They are made of high-quality steel, which requires a large amount of expensive steel, resulting in high support costs and poor economic efficiency. This is not conducive to achieving the cost reduction and efficiency improvement goals promoted by the coal mining industry. Utility Model Content

[0003] The purpose of this utility model is to provide a mining-grade constant resistance large deformation anchor cable without hole expansion, so as to solve the problems of complicated construction procedures, high construction difficulty and high cost of existing technology.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A mining-grade constant-resistance large-deformation anchor cable without borehole expansion includes a sliding extrusion device, a variable-diameter metal cylinder, a cable body, and an anchor cable tray. One end of the cable body is fixed to the top of the borehole inside the anchor cable body, and a variable-diameter metal cylinder is fixedly installed on the inner side of the other end. The anchor cable tray is sleeved on the cable body, and the sliding extrusion device is sleeved on the cable body 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 to provide constant resistance for the anchor cable.

[0006] Furthermore, the variable diameter metal cylinder includes a small-diameter cylindrical cylinder, a variable-diameter frustum cylinder, and a large-diameter cylindrical cylinder, which are connected in sequence to form the variable diameter metal cylinder.

[0007] Furthermore, the sliding extrusion device is fitted onto the connection between the small-diameter cylindrical tube and the truncated cone tube of the variable-diameter metal cylinder.

[0008] Furthermore, the outer side of the smaller diameter cylindrical tube of the variable diameter metal cylinder is provided with a groove, which is then bonded and fixed to the inner side of the cable body with an adhesive.

[0009] Furthermore, the outer side of the smaller diameter cylindrical tube of the variable diameter metal cylinder is provided with external threads, which are fixedly connected to the inner side of the cable body by the threads.

[0010] 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.

[0011] 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.

[0012] 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.

[0013] Furthermore, the upper surface of the anchor cable tray is attached to the tunnel roof.

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

[0015] Compared with the prior art, the present invention has the following technical effects:

[0016] This invention incorporates an alloy structural component in the lower section of the anchor cable body, consisting of an 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 the locking 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 constant resistance of the anchor cable is provided by the compressive force required during the diameter reduction process of the metal cylinder, and the large deformation elongation of the anchor cable is provided by the sliding range of the locking device and the locking core after the diameter reduction of the metal cylinder. This design enables the anchor cable to achieve constant resistance and large deformation without the need for hole enlargement, allowing for large deformation, constant resistance operation, and anchor retraction. It also features a simple structure, high efficiency, light weight, easy installation, and good economic benefits. Attached Figure Description

[0017] Figure 1 Main design drawing of mining non-expanded constant resistance anchor cable structure.

[0018] Figure 2 Structural diagram of a mining-grade constant-resistance anchor cable before elongation (without hole expansion).

[0019] Figure 3 Structural diagram of a mining-grade constant resistance anchor cable without hole expansion after elongation.

[0020] The components are: 1. Cable body, 2. Resin anchoring agent, 3. Anchor cable body drilling, 4. Anchor cable tray, 5. Anchor cable lock, 6. Inner wall concave and convex parts, 7. Lock core clamp, 9. Lock core threaded collar, 10. Variable diameter metal cylinder. Detailed Implementation

[0021] 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.

[0022] 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.

[0023] 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.

[0024] Example 1, please refer to Figure 1 This utility model provides a mining-grade constant-resistance large-deformation anchor cable without borehole expansion, including a sliding extrusion device, a variable-diameter metal cylinder 10, a cable body 1, and an anchor cable tray 4; one end of the cable body 1 is fixed to the top of the borehole of the anchor cable body, and the variable-diameter metal cylinder 10 is fixedly installed on the inner side of the other end. The anchor cable tray 4 is sleeved on the cable body 1, and the sliding extrusion device is sleeved on the cable body 1 below the anchor cable tray 4. When the anchor cable tray 4 is under force, the sliding extrusion device extrudes the variable-diameter part of the variable-diameter metal cylinder 10 to provide constant resistance of the anchor cable.

[0025] This utility model provides a mining-use constant resistance large deformation anchor cable without hole enlargement. This device can not only meet the support requirements of no hole enlargement, large deformation, constant resistance operation, and anchor retraction, but also has the characteristics of simple structure, high efficiency, light weight, easy installation, and good economy.

[0026] Example 2: This utility model provides a mining-grade, non-expanding, constant-resistance, large-deformation anchor cable, including a sliding extrusion device, a variable-diameter metal cylinder 10, a cable body 1, and an anchor cable tray 4. One end of the cable body 1 is fixed in the deep, stable surrounding rock at the top of the anchor cable borehole using a resin anchoring agent, while the other end has the variable-diameter metal cylinder 10 fixedly installed on its inner side. The variable-diameter metal cylinder 10 is composed of an upper smaller-diameter cylindrical cylinder, a middle variable-diameter frustum cylinder, and a lower larger-diameter cylindrical cylinder connected sequentially. The outer side of the smaller-diameter cylindrical cylinder can be firmly fixed to the inner side of the cable body 1 via grooves combined with high-strength adhesive or external threads, and its length is determined according to the required anti-slip force. Anchor cable tray 4 is fitted onto cable body 1, with its upper surface pressed tightly against the tunnel roof. A sliding compression device is fitted onto the lower cable body 1. This device consists of anchor cable lock 5 and several lock core clips 7. The lock core clips 7 are assembled into a hollow cone shape and placed between the inner surface of the anchor cable lock 5 and the outer surface of the cable body 1, and are fastened as a whole by steel wire on the lock core threaded collar 9. The inner surfaces of both the anchor cable lock 5 and the lock core clips 7 are provided with inner wall concave-convex parts 6.

[0027] This invention incorporates an alloy structural component in the lower section of the anchor cable body, consisting of an 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 the locking 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 constant resistance of the anchor cable is provided by the compressive force required during the diameter reduction process of the metal cylinder, and the large deformation elongation of the anchor cable is provided by the sliding range of the locking device and the locking core after the diameter reduction of the metal cylinder. This design enables the anchor cable to achieve constant resistance and large deformation without the need for hole enlargement, allowing for large deformation, constant resistance operation, and anchor retraction. It also features a simple structure, high efficiency, light weight, easy installation, and good economic benefits.

[0028] The working principle of this utility model:

[0029] (1) First, a rock drill bit is used to drill a hole 3 in the cable body.

[0030] (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.

[0031] (3) Then, the anchor cable tray 4 is placed on the tail of the constant resistance large deformation anchor cable body 1 with the variable diameter metal cylinder 10 installed at the tail, and 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.

[0032] (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 7, so as to realize the anchor cable pretension lock.

[0033] (5) Then, remove the tensioning jack.

[0034] (6) After the constant resistance anchor cable is installed, as the roof of the goaf roadway sinks along the 110 method, the surrounding rock of the roof will squeeze the anchor cable 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.

[0035] (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.

[0036] (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.

[0037] 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 constant-resistance large-deformation anchor cable without borehole expansion, characterized in that, It includes a sliding extrusion device, a variable diameter metal cylinder (10), a cable body (1), and an anchor cable tray (4); one end of the cable body (1) is fixed to the top of the anchor cable body borehole, and the other end is fixed to the inner side of the variable diameter metal cylinder (10). The anchor cable tray (4) is sleeved on the cable body (1). The sliding extrusion device is sleeved on the cable body (1) below the anchor cable tray (4). When the anchor cable tray (4) is under force, the sliding extrusion device extrudes the variable diameter part of the variable diameter metal cylinder (10) to provide constant resistance to the anchor cable.

2. The mining-grade constant-resistance large-deformation anchor cable without borehole expansion 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 connected in sequence to form the variable diameter metal cylinder (10).

3. The mining-grade constant-resistance large-deformation anchor cable without borehole expansion according to claim 2, characterized in that, The sliding extrusion 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).

4. A mining-grade constant-resistance large-deformation anchor cable without borehole expansion according to claim 2, characterized in that, The small-diameter cylindrical tube of the variable-diameter metal cylinder (10) has a groove on its outer side, which is fixed to the inner side of the cable body (1) by adhesive.

5. A mining-grade constant-resistance large-deformation anchor cable without borehole expansion according to claim 2, characterized in that, The small-diameter cylindrical tube of the variable-diameter metal cylinder (10) is provided with external threads on the outside, and is fixedly connected to the inside of the cable body (1) by threads.

6. A mining-grade constant-resistance large-deformation anchor cable without borehole expansion 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).

7. A mining-grade constant-resistance large-deformation anchor cable without borehole expansion according to claim 6, 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.

8. A mining-grade constant-resistance large-deformation anchor cable without borehole expansion according to claim 6, 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).

9. A mining-grade constant-resistance large-deformation anchor cable without borehole expansion according to claim 1, characterized in that, The upper surface of the anchor cable tray (4) is attached to the roof of the roadway.

10. A mining-grade constant-resistance large-deformation anchor cable without borehole expansion 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.

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