High-elongation flexible anchor rod

Abstract

The utility model provides a high-elongation flexible anchor rod. The high-elongation flexible anchor rod comprises a nest type rod body, a locking sleeve, a locking nut and a tray, the nest type rod body is a wire harness body formed by spirally winding a plurality of high-strength steel strands, one or more positions in the length direction of the wire harness body are annularly and outwards protruded to form a nest cage, and a containing cavity is formed in the nest cage; the locking sleeve is of a cylindrical structure and fixedly arranged on the outer side of the head end of the fastening section of the nest type rod body in a sleeving mode through a cavity in the axis of the locking sleeve, and an external thread structure is arranged on the outer surface of the locking sleeve. The locking nut is matched with the external thread structure and connected to the outer portion of the locking sleeve in a threaded fit mode. The outer side of the locking sleeve is sleeved with the tray in a sliding mode through an anchor hole in the center of the tray. The anchor rod has the advantages of high elongation, high tensile strength, large bearing capacity, light weight, bendability, unlimited length, high supporting strength and the like, is ideal in supporting effect, and can meet the supporting requirements of continuous deformation and overall displacement change of roadway surrounding rocks.

Description

Technical Field

[0001] The utility model belongs to the technical field of anchoring and supporting, and in particular relates to a high-elongation flexible anchor rod. Background Art

[0002] Anchor rods are commonly used support and reinforcement tools for coal mines and engineering enterprises. They are mainly used in deep tunnel support of coal, iron ore and other large-scale geotechnical engineering projects such as high-speed railways, highways, and dams. The working principle of anchor rods is to overcome the disadvantage that the tensile capacity of rock and soil is far lower than its compressive capacity through the longitudinal tension of the nested rod body. On the surface, it limits the separation of rock and soil from the original body. On a macroscopic level, it increases the cohesion of rock and soil. It is a rod system structure for rock and soil reinforcement.

[0003] The anchors used in existing coal mine tunnel support are usually anchor rods, anchor cables and flexible anchor rods. Anchor rods are generally made of threaded steel bars, which generally have disadvantages such as low tensile strength and heavy weight. At the same time, this type of anchor rod is easily limited by the height of the tunnel, and its length can only be maintained at about 2m. Therefore, the thickness of the anchor rod anchoring area can only reach 2m, which cannot effectively adapt to the complex geological conditions of the current tunnel. Anchor cables are usually made of steel strands. Although they are long enough, their installation process is complicated and usually affects the excavation speed. At the same time, the longer the length of the anchor cable, the greater the preload required, and the equipment on site often cannot apply a large enough preload. Flexible anchor rods are usually made of high-strength steel strands, which have the advantages of light weight, bendability, and sufficient initial support strength and stiffness. However, the elongation of flexible anchor rods is poor. In actual working conditions, the tunnel surrounding rock usually has a certain degree of continuous deformation and overall displacement changes. Therefore, limited by the elongation of existing steel strands, the existing flexible anchor rods cannot meet the requirements of deep soft rock tunnel support. For this reason, there is an urgent need to provide a flexible anchor rod with high elongation. Summary of the invention

[0004] In view of the problems existing in the above-mentioned prior art, the utility model provides a high-elongation flexible anchor rod, which has many advantages such as high elongation, high tensile strength, large bearing capacity, light weight, bendability, unlimited length and high support strength. It has an ideal support effect and can meet the support needs of continuous deformation and overall displacement changes of tunnel surrounding rock.

[0005] In order to achieve the above-mentioned invention object, the utility model provides a high-elongation flexible anchor rod, including a nested rod body, a locking sleeve, a locking nut and a tray;

[0006] The nested rod body is a wire harness body formed by spirally winding a plurality of high-strength steel strands, and a nest cage is formed by protruding outward in a ring at one or more positions in the length direction of the wire harness body, and the interior of the nest cage has a receiving cavity;

[0007] The locking sleeve is a cylindrical structure, and is fixedly sleeved on the outside of the head end of the nested rod fastening section through a cavity at its axis, and an external thread structure is provided on its outer surface;

[0008] The locking nut is adapted to the external thread structure and is connected to the outside of the locking sleeve through thread matching;

[0009] The tray is slidably sleeved on the outer side of the locking sleeve through the anchor hole in the center of the tray.

[0010] Furthermore, it also includes a self-locking disk, a through hole is opened in the center of the self-locking disk, and is sleeved on the outer side of the nested rod body fastening section through the through hole, and the self-locking disk and the nested rod body fastening section are radially limited and matched.

[0011] As a preferred embodiment, when there is one nest cage, it is arranged at the end of the nested rod body anchoring section or in the middle of the nested rod body anchoring section. Arranging the nest cage at the end of the nested rod body anchoring section can effectively increase the overall anchoring effect and at the same time, it is helpful to ensure that the end will not be unanchored. Arranging the nest cage in the middle of the nested rod body anchoring section can ensure that the nested rod body has a good elongation.

[0012] As a preference, in order to fully improve the elongation of the nested rod body, when there are multiple cages, the multiple cages are evenly distributed along the length direction of the nested rod body anchoring section, and no cage is provided at the end of the nested rod body anchoring section, or the multiple cages are unevenly distributed along the length direction of the nested rod body anchoring section, and no cage is provided at the end of the nested rod body anchoring section.

[0013] As another preference, in order to fully improve the elongation of the nested rod body, when there are multiple cages, the multiple cages are evenly distributed along the length direction of the nested rod body anchoring section, and a cage is provided at the end of the nested rod body anchoring section, or the multiple cages are unevenly distributed along the length direction of the nested rod body anchoring section, and a cage is provided at the end of the nested rod body anchoring section.

[0014] Furthermore, in order to improve the tensile strength of the nest cage part during the extension process, it also includes an elastic resin block, the shape and size of the elastic resin block are adapted to the shape and size of the internal accommodating cavity of the nest cage;

[0015] As a preferred embodiment, when the number of the nest cage is one, the number of the elastic resin block is one or zero, and when the number is one, it is installed in the accommodating cavity of the nest cage;

[0016] As another preferred embodiment, when there are multiple nests, the number of the elastic resin blocks is less than or equal to the number of nests. When the number of the elastic resin blocks is less than the number of the nests, the multiple elastic resin blocks are randomly installed in the corresponding multiple nests. When the number of the elastic resin blocks is equal to the number of the nests, the multiple elastic resin blocks are installed in the multiple nests one by one. By adding elastic resin blocks in the nests, after the force-bearing diameter of the nested rod body is reduced to a certain extent, the elastic resin blocks are compressed and deformed, and then the elastic resin blocks can provide bearing capacity, thereby achieving the purpose of increasing the overall elongation of the nested rod body without reducing the strength of the rod body.

[0017] Furthermore, in order to improve the overall supporting strength, the tray is an arched tray.

[0018] Furthermore, in order to ensure the self-aligning and positioning effect, the locking nut is a spherical crown self-aligning nut.

[0019] Furthermore, in order to improve the radial limiting effect and at the same time ensure that the self-locking disk has a certain axial movement ability relative to the nested rod body, so as to ensure that the tray can be reliably pressed on the self-locking disk during the subsequent pre-tightening process, the outer contour of the wiring harness body cross-section is a plum blossom shape; the through hole in the center of the self-locking disk is a plum blossom hole, and the plum blossom hole is adapted to the outer contour of the wiring harness body cross-section.

[0020] Furthermore, in order to effectively ensure that the anchor rod achieves a good pre-tightening effect on the basis of effective support through the joint synergy of the locking nut, the tray and the self-locking disk, and at the same time, to further ensure that the nested rod body will not be damaged during locking, the anchor hole in the center of the tray is a spherical crown shape that is recessed inward on the side close to the locking nut; the end of the locking nut close to the tray is a spherical crown shape that protrudes outward, and the end of the locking nut is coaxially pressed and positioned with the anchor hole in the center of the tray. This structural combination can utilize the locking nut and the tray to achieve the effect of self-aligning and positioning. At the same time, the self-locking disk can be used to limit the rotation of the nested rod body, so that the nested rod body can be ensured not to rotate during the tightening of the locking nut. At the same time, it can ensure that the nested rod body is always in the center area of ​​the tray anchor hole, and then through the combination of the ball crown self-aligning nut, the arched tray and the self-locking disk, it can be ensured that the nested rod body does not rotate during the pre-tightening process, which is conducive to the efficient application of pre-tightening force, and can ensure that the nested rod body will not be damaged during the application of the pre-tightening force, thereby ensuring that the pre-tightening force meets the design requirements and at the same time, ensures the support strength during subsequent use.

[0021] In the utility model, by arranging one or more nests on the nested rod body, the nested rod body can be deformed when the support resistance reaches a certain level, that is, the elongation of the anchor rod is increased by extending the nested cage part, and then the nested cage can effectively improve the elongation of the flexible anchor rod without reducing the support strength, so that the flexible anchor rod can be more suitable for the working conditions of deep soft rock tunnels with large nonlinear deformation and frequent impact, and effectively meet the support requirements of continuous deformation and overall displacement changes of the tunnel surrounding rock. Since the nested rod body adopts a harness body made of high-strength steel strands, and the nested cage is formed on the harness body in a circular convex manner, the nested rod body can maintain the tensile strength of the high-strength steel strands while also having the high elongation of ordinary threaded steel anchor rods, so that the anchor rod has many advantages such as high elongation, high tensile strength, large bearing capacity, light weight, bendability, unlimited length and high support strength. By installing a locking sleeve on the outside of the first end of the nested rod body fastening section, the lock can be prevented from directly contacting the nested rod body, ensuring that the nested rod body will not be damaged during the locking process, and providing good protection for the wire harness composed of steel strands, which is conducive to ensuring the support strength during later use. At the same time, this threaded locking method also effectively avoids the shortcomings of the anchor being inconvenient to withdraw and easy to slip and produce sparks during the withdrawal process. By installing a self-locking disk on the outside of the nested rod body fastening section and making the self-locking disk and the nested rod body cooperate in radial limiting, on the one hand, the self-locking disk can be used to effectively prevent the anchor rod from rotating radially after the anchoring agent solidifies, and on the other hand, it can ensure that the nested rod body does not rotate radially during the tightening of the nut, which is conducive to applying a predetermined torque force and effectively meets the requirements for ensuring the preload force of the anchor rod.

[0022] This anchor rod absorbs and combines the advantages of traditional anchor rods and anchor cables to obtain a high-elongation flexible anchor rod, which effectively overcomes the shortcomings of traditional anchor rods, anchor cables and ordinary flexible anchor rods. Its supporting strength is much greater than that of threaded steel bar anchor rods with the same diameter, and its elongation is much greater than that of anchor cables and ordinary flexible anchor rods with the same diameter. It is easy to install and use, has a wide range of applicability, and is suitable for large-scale promotion and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the utility model;

[0024] Figure 2 It is a structural schematic diagram of the utility model in which the nest cage is equipped with elastic resin blocks.

[0025] In the figure: 1. nested rod body, 2. locking sleeve, 3. locking nut, 4. tray, 5. self-locking disk, 6. nest cage, 7. elastic resin block. DETAILED DESCRIPTION

[0026] The utility model will be further described below in conjunction with the accompanying drawings.

[0027] like Figure 1 As shown, the present invention provides a high-elongation flexible anchor rod, comprising a nested rod body 1, a locking sleeve 2, a locking nut 3 and a tray 4;

[0028] The nested rod body 1 is a wire harness body composed of a plurality of high-strength steel strands wound in a spiral manner, and a nest cage 6 is formed at one or more positions in the length direction of the wire harness body, and the nest cage 6 has a receiving cavity inside;

[0029] As a preferred embodiment, the nest cage 6 is formed by mechanical pressing.

[0030] The number of nest cages 6 can be determined according to the actual engineering situation. As a preferred embodiment, the distance between two adjacent nest cages 6 can be, but is not limited to, 100 to 1000 mm. As a further preferred embodiment, the diameter of the accommodating cavity inside the nest cage 6 is in the range of 28 to 50 mm.

[0031] The locking sleeve 2 is a cylindrical structure, and is fixedly sleeved on the outside of the head end of the fastening section of the nested rod body 1 through the cavity at its axis, and its outer surface is provided with an external thread structure;

[0032] The locking nut 3 is adapted to the external thread structure and is connected to the outside of the locking sleeve 2 through thread matching;

[0033] The tray 4 is slidably mounted on the outer side of the locking sleeve 2 through the anchor hole in the center thereof;

[0034] As a preferred embodiment, it further includes a self-locking disk 5, which has a through hole in its center and is sleeved on the outer side of the fastening section of the nested rod body 1 through the through hole, and the self-locking disk 5 is radially limited and matched with the fastening section of the nested rod body 1.

[0035] As a preferred embodiment, when there is one nest cage 6, it is arranged at the end of the anchoring section of the nested rod body 1 or at the middle of the anchoring section of the nested rod body 1. Arranging the nest cage at the end of the anchoring section of the nested rod body can effectively increase the overall anchoring effect and at the same time, it is helpful to ensure that the end will not be unanchored. Arranging the nest cage in the middle of the anchoring section of the nested rod body can ensure that the nested rod body has a good elongation.

[0036] As a preference, in order to fully improve the elongation of the nested rod body, when there are multiple nest cages 6, the multiple nest cages 6 are evenly distributed along the length direction of the anchoring section of the nested rod body 1, and no nest cage 6 is provided at the end of the anchoring section of the nested rod body 1, or the multiple nest cages 6 are unevenly distributed along the length direction of the anchoring section of the nested rod body 1, and no nest cage 6 is provided at the end of the anchoring section of the nested rod body 1.

[0037] As another preference, in order to fully improve the elongation of the nested rod body, when there are multiple nest cages 6, the multiple nest cages 6 are evenly distributed along the length direction of the anchoring section of the nested rod body 1, and a nest cage 6 is provided at the end of the anchoring section of the nested rod body 1, or the multiple nest cages 6 are unevenly distributed along the length direction of the anchoring section of the nested rod body 1, and a nest cage 6 is provided at the end of the anchoring section of the nested rod body 1.

[0038] like Figure 2 As shown, in order to improve the tensile strength of the nest cage part during the extension process, an elastic resin block 7 is also included, and the shape and size of the elastic resin block 7 are adapted to the shape and size of the internal accommodating cavity of the nest cage 6;

[0039] As a preferred embodiment, when the number of the nest cage 6 is one, the number of the elastic resin block 7 is one or zero. When the number is one, it is installed in the accommodating cavity of the nest cage 6;

[0040] As another preferred embodiment, when there are multiple nests 6, the number of the elastic resin blocks 7 is less than or equal to the number of the nests 6. When the number of the elastic resin blocks 7 is less than the number of the nests 6, the multiple elastic resin blocks 7 are randomly installed in the corresponding multiple nests 6. When the number of the elastic resin blocks 7 is equal to the number of the nests 6, the multiple elastic resin blocks 7 are installed in the multiple nests 6 in a one-to-one correspondence. By adding elastic resin blocks 7 to the nests, after the force-bearing diameter of the nested rod body is reduced to a certain extent, the elastic resin blocks 7 can be compressed and deformed, and then the elastic resin blocks 7 can provide bearing capacity, thereby achieving the purpose of increasing the overall elongation of the nested rod body without reducing the strength of the rod body.

[0041] In order to improve the overall supporting strength, the tray 4 is an arched tray 4.

[0042] In order to ensure the centering and positioning effect, the locking nut 3 is a spherical crown centering nut.

[0043] In order to improve the radial limiting effect and at the same time ensure that the self-locking disk has a certain axial movement ability relative to the nested rod body, so as to ensure that the tray can be reliably pressed on the self-locking disk during the subsequent pre-tightening process, the outer contour of the wiring harness body cross-section is plum blossom-shaped; the through hole in the center of the self-locking disk 5 is a plum blossom hole, and the plum blossom hole is adapted to the outer contour of the wiring harness body cross-section.

[0044] In order to ensure that the anchor rod achieves a good pre-tightening effect on the basis of effective support through the joint synergy of the locking nut, tray and self-locking disk, and at the same time, further ensure that the nested rod body will not be damaged during locking, the anchor hole in the center of the tray 4 is a spherical crown shape that is recessed inward on the side close to the locking nut 3; the end of the locking nut 3 close to the tray 4 is a spherical crown shape that protrudes outward, and the end of the locking nut 3 is coaxially pressed and positioned with the anchor hole in the center of the tray 4. This structural combination can utilize the locking nut and the tray to achieve the effect of self-aligning and positioning. At the same time, the self-locking disk can be used to limit the rotation of the nested rod body, so that the nested rod body can be ensured not to rotate during the tightening of the locking nut. At the same time, it can ensure that the nested rod body is always in the center area of ​​the tray anchor hole, and then through the combination of the ball crown self-aligning nut, the arched tray and the self-locking disk, it can be ensured that the nested rod body does not rotate during the pre-tightening process, which is conducive to the efficient application of pre-tightening force, and can ensure that the nested rod body will not be damaged during the application of the pre-tightening force, thereby ensuring that the pre-tightening force meets the design requirements and at the same time, ensures the support strength during subsequent use.

[0045] When in use, first use an anchor drill to drill a matching hole according to the length of the nest rod body 1 and the diameter of the nest cage 6, then insert the anchor into the hole, and use the nest rod body 1 equipped with a self-locking disk 5 to push the anchor into the bottom of the hole. Then, use the installation sleeve to connect the anchor drill to the nest rod body 1 at the exposed end of the flexible anchor rod. At this time, the nest rod body 1 is not locked, so the nest rod body 1 can rotate; start the anchor drill to drive the steel strand nest rod body 1 to rotate and stir the anchor, use the anchor drill to tighten the nest rod body 1, and after the anchor is solidified, install the tray 4 and the locking nut 3 on the locking sleeve 2 in turn. Finally, use the nut sleeve to tighten the locking nut 3 and press the tray 4 on the tunnel wall. At the same time, use the tray 4 to press and fix the self-locking disk 5, and apply a pre-tightening force until the set torque is reached. As a preferred embodiment, the applied pre-tightening force is not less than a pre-tightening torque of 200N·m.

[0046] In the utility model, by arranging one or more nests on the nested rod body, the nested rod body can be deformed when the support resistance reaches a certain level, that is, the elongation of the anchor rod is increased by extending the nested cage part, and then the nested cage can effectively improve the elongation of the flexible anchor rod without reducing the support strength, so that the flexible anchor rod can be more suitable for the working conditions of deep soft rock tunnels with large nonlinear deformation and frequent impact, and effectively meet the support requirements of continuous deformation and overall displacement changes of the tunnel surrounding rock. Since the nested rod body adopts a harness body made of high-strength steel strands, and the nested cage is formed on the harness body in a circular convex manner, the nested rod body can maintain the tensile strength of the high-strength steel strands while also having the high elongation of ordinary threaded steel anchor rods, so that the anchor rod has many advantages such as high elongation, high tensile strength, large bearing capacity, light weight, bendability, unlimited length and high support strength. By installing a locking sleeve on the outside of the first end of the nested rod body fastening section, the lock can be prevented from directly contacting the nested rod body, ensuring that the nested rod body will not be damaged during the locking process, and providing good protection for the wire harness composed of steel strands, which is conducive to ensuring the support strength during later use. At the same time, this threaded locking method also effectively avoids the shortcomings of the anchor being inconvenient to withdraw and easy to slip and produce sparks during the withdrawal process. By installing a self-locking disk on the outside of the nested rod body fastening section and making the self-locking disk and the nested rod body cooperate in radial limiting, on the one hand, the self-locking disk can be used to effectively prevent the anchor rod from rotating radially after the anchoring agent solidifies, and on the other hand, it can ensure that the nested rod body does not rotate radially during the tightening of the nut, which is conducive to applying a predetermined torque force and effectively meets the requirements for ensuring the preload force of the anchor rod.

[0047] This anchor rod absorbs and combines the advantages of traditional anchor rods and anchor cables to obtain a high-elongation flexible anchor rod, which effectively overcomes the shortcomings of traditional anchor rods, anchor cables and ordinary flexible anchor rods. Its supporting strength is much greater than that of threaded steel bar anchor rods with the same diameter, and its elongation is much greater than that of anchor cables and ordinary flexible anchor rods with the same diameter. It is easy to install and use, has a wide range of applicability, and is suitable for large-scale promotion and use.

Claims

1. A high-elongation flexible anchor rod, comprising a nested rod body (1); It is characterized in that It also includes a locking sleeve (2), a locking nut (3) and a tray (4); The nested rod body (1) is a wire harness body formed by spirally winding a plurality of high-strength steel strands, and a nest cage (6) is formed at one or more positions in the length direction of the wire harness body in a circular manner and protrudes outwards, and the interior of the nest cage (6) has a receiving cavity; The locking sleeve (2) is a cylindrical structure, and is fixedly sleeved on the outside of the head end of the fastening section of the nested rod body (1) through a cavity at its axis, and an external thread structure is provided on its outer surface; The locking nut (3) is adapted to the external thread structure and is connected to the outside of the locking sleeve (2) through thread matching; The tray (4) is slidably sleeved on the outside of the locking sleeve (2) through an anchor hole in the center of the tray (4).

2. A high elongation flexible anchor rod according to claim 1, It is characterized in that It also comprises a self-locking disc (5), the center of which is provided with a through hole, and is sleeved on the outer side of the fastening section of the nested rod body (1) through the through hole, and the self-locking disc (5) and the fastening section of the nested rod body (1) are radially limited and matched.

3. A high elongation flexible anchor rod according to claim 1 or 2, It is characterized in that When the number of the nest cage (6) is one, it is arranged at the end of the anchoring section of the nested rod body (1) or in the middle of the anchoring section of the nested rod body (1).

4. A high elongation flexible anchor rod according to claim 1 or 2, It is characterized in that When there are multiple nest cages (6), the multiple nest cages (6) are evenly distributed along the length direction of the anchoring section of the nested rod body (1), and no nest cage (6) is provided at the end of the anchoring section of the nested rod body (1); or the multiple nest cages (6) are unevenly distributed along the length direction of the anchoring section of the nested rod body (1), and no nest cage (6) is provided at the end of the anchoring section of the nested rod body (1).

5. A high elongation flexible anchor rod according to claim 1 or 2, It is characterized in that When there are multiple nest cages (6), the multiple nest cages (6) are evenly distributed along the length direction of the anchoring section of the nested rod body (1), and the nest cage (6) is provided at the end of the anchoring section of the nested rod body (1); or the multiple nest cages (6) are unevenly distributed along the length direction of the anchoring section of the nested rod body (1), and the nest cage (6) is provided at the end of the anchoring section of the nested rod body (1).

6. A high elongation flexible anchor rod according to claim 5, It is characterized in that It also includes an elastic resin block (7), the shape and size of the elastic resin block (7) being compatible with the shape and size of the internal accommodation cavity of the nest cage (6); When the number of the nest cage (6) is one, the number of the elastic resin block (7) is one or zero. When the number is one, it is installed in the accommodating cavity of the nest cage (6); When the number of the nest cages (6) is multiple, the number of the elastic resin blocks (7) is less than or equal to the number of the nest cages (6); when the number of the elastic resin blocks (7) is less than the number of the nest cages (6), the multiple elastic resin blocks (7) are installed in the corresponding multiple nest cages (6) in a random manner; when the number of the elastic resin blocks (7) is equal to the number of the nest cages (6), the multiple elastic resin blocks (7) are installed in the multiple nest cages (6) in a one-to-one correspondence.

7. A high elongation flexible anchor rod according to claim 1, It is characterized in that The tray (4) is an arched tray (4).

8. A high elongation flexible anchor rod according to claim 7, It is characterized in that The locking nut (3) is a spherical crown self-aligning nut.

9. A high elongation flexible anchor rod according to claim 2, It is characterized in that The outer contour of the cross section of the wiring harness body is in the shape of a plum blossom; the through hole in the center of the self-locking disk (5) is a plum blossom hole, and the plum blossom hole is matched with the outer contour of the cross section of the wiring harness body.

10. A high elongation flexible anchor rod according to claim 8, It is characterized in that The anchor hole in the center of the tray (4) is in the shape of a spherical cap that is recessed inwardly on the side close to the locking nut (3); the end of the locking nut (3) close to the tray (4) is in the shape of a spherical cap that is protruding outwardly, and the end of the locking nut (3) is coaxially pressed and positioned with the anchor hole in the center of the tray (4).

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