A reusable constant resistance suspension top beam

Abstract

The present invention provides a reusable constant resistance suspension top beam, which includes a recyclable top beam and a constant resistance pressure relief device, the constant resistance pressure relief device is fixed to the lower part of the recyclable top beam, the recyclable top beam includes a box-type top beam and a shear, the box-type top beam is arranged close to the surrounding rock, a protective space is formed inside the box-type top beam, and an anchor cable passes through the box-type top beam and is anchored on the surrounding rock; the shear is arranged inside the protective space of the box-type top beam, and the shear is sleeved on the exposed end of the anchor cable, and is used to cut the anchor cable so as to recycle the constant resistance suspension top beam. The recyclable top beam not only plays the role of a conventional top beam in maintaining the surrounding rock, but also realizes the recycling and reuse of the entire set of constant resistance suspension top beams, effectively reducing the support cost, and the simple protective space formed by the box-type top beam protects the shear from being easily damaged in complex environments.

Description

Technical Field

[0001] The invention belongs to the technical field of rock and soil anchoring and engineering support, and in particular relates to a reusable constant resistance suspended top beam. Background Art

[0002] With the increasing complexity of underground mining conditions in coal mines, tunnel surrounding rocks often show irresistible large deformation characteristics under difficult conditions. Especially for mining tunnels affected by severe mining, in order to ensure safe production, re-support is required in a certain range in front of the working face. Although the commonly used single hydraulic props can play a good maintenance role, they not only occupy a large amount of tunnel space, but also consume a lot of manpower, seriously affecting the effective progress of production operations; in addition, although conventional anchor cables can reduce the impact of support on tunnel space, they also have the advantages of high strength, large control range, and high prestress, but their extension performance and impact resistance are difficult to adapt to the severe deformation of the surrounding rock. In order to solve this kind of problem, people have continuously explored new materials and structures to improve the support body through a lot of practice, and have achieved some beneficial results, such as constant resistance large deformation anchor rods, constant resistance deformers, etc. The above-mentioned support structures are not easy to recycle and reuse during use, and the resulting increase in support costs and construction processes has limited the large-scale application of existing achievements to a certain extent.

[0003] Therefore, it is necessary to provide an improved technical solution to address the above-mentioned deficiencies in the prior art. Summary of the invention

[0004] The purpose of the present invention is to provide a reusable constant resistance suspended top beam, so as to at least solve the problems that the current support structure is not easy to recycle and reuse, and the support cost is relatively high.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] A reusable constant resistance suspension top beam, the constant resistance suspension top beam comprising a recyclable top beam and a constant resistance pressure relief device, the constant resistance pressure relief device is fixed to the lower part of the recyclable top beam, the recyclable top beam comprises:

[0007] A box-type top beam, wherein the box-type top beam is arranged close to the surrounding rock, a protective space is formed inside the box-type top beam, and an anchor cable passes through the box-type top beam and is anchored on the surrounding rock;

[0008] A shear is arranged inside the protective space of the box-type top beam, and the shear is sleeved on the exposed end of the anchor cable to cut the anchor cable so as to recover the constant resistance suspension top beam.

[0009] As described above, the constant resistance suspension top beam, preferably, the shearing device comprises a hydraulic cylinder, a sliding pad and a shearing head;

[0010] The movable cylinder body of the hydraulic cylinder is connected to the sliding gasket to drive the sliding gasket to move along the axial direction of the anchor cable;

[0011] The shearing head is sleeved on the anchor cable, and the shearing head is slidably matched with the sliding gasket, and the sliding gasket pushes the shearing head to move radially toward the anchor cable to shear the anchor cable.

[0012] As described above, the constant resistance suspension top beam, preferably, the hydraulic cylinder comprises:

[0013] An oil cylinder inner tube, wherein the oil cylinder inner tube is sleeved on the anchor cable, and the upper end of the oil cylinder inner tube abuts against the shear head;

[0014] The outer cylinder tube is arranged on the periphery of the inner cylinder tube, the upper end of the outer cylinder tube abuts against the lower wall of the sliding gasket, and two oil chambers are formed between the outer cylinder tube and the inner cylinder tube. The outer cylinder tube is driven to move up and down by the change of oil amount in the two oil chambers, thereby pushing the sliding gasket to move. The outer cylinder tube is the movable cylinder body of the hydraulic cylinder.

[0015] As described above, the constant resistance suspension top beam, preferably, the outer cylinder is provided with an oil inlet and an oil outlet, and an oil circuit is connected through the oil inlet and the oil outlet to control the movement of the outer cylinder relative to the inner cylinder;

[0016] Preferably, a blocking plug is provided in the oil chamber so as to divide the oil chamber between the oil cylinder outer tube and the oil cylinder inner tube into two, and the blocking plug is located between the oil inlet and the oil outlet.

[0017] As described above, the constant resistance suspension top beam, preferably, the shearing head comprises two metal blocks, and the metal blocks are L-shaped;

[0018] The transverse sides of the metal blocks are stacked on each other, and holes are provided on the transverse sides of the two metal blocks, and the anchor cables pass through the holes;

[0019] The vertical sides of the two metal blocks are respectively slidably matched with the two ends of the sliding gasket, and the distance between the vertical sides of the metal blocks and the inner tube of the oil cylinder is continuously shortened in the upward direction;

[0020] Preferably, a groove is provided at the hole, and when the two metal blocks are sleeved on the periphery of the anchor cable, the center of the intersection of the overlapping surfaces of the two metal blocks and the axis of the anchor cable is defined as the center point, and the two grooves are centrally symmetrical around the center point.

[0021] As described above, the constant resistance suspended top beam, preferably, the box-type top beam is formed by two I-beams fixedly connected.

[0022] As described above, the constant resistance suspension top beam, preferably, the constant resistance pressure relief device comprises:

[0023] A metal tube, wherein the metal tube is sleeved on the outer periphery of the anchor cable, and a thread is provided on the inner wall of the metal tube;

[0024] a spring, the spring being disposed in the thread;

[0025] A conical lock, the conical lock is fastened to the anchor cable, the conical lock is arranged at the mouth of the metal pipe, the minimum outer diameter of the conical lock is smaller than the inner diameter of the metal pipe, and the maximum outer diameter of the conical lock is the same as the inner diameter of the metal pipe;

[0026] Preferably, the oil cylinder inner tube and the metal tube are an integral structure.

[0027] As described above, in the constant resistance suspension top beam, preferably, the thread is a trapezoidal thread, and the spring is tangent to two side edges of the trapezoidal thread.

[0028] As described above, the constant resistance suspended top beam, preferably, the outer periphery of the metal tube is connected with a pad, the pad is sleeved on the outer wall of the metal tube, the pad and the bottom of the box-type top beam block each other to prevent the metal tube from moving upward.

[0029] As described above, in the constant resistance suspension top beam, preferably, the sliding gasket is sleeved on the periphery of the oil cylinder inner tube, and the sliding gasket slides along the guide of the oil cylinder inner tube.

[0030] Compared with the closest prior art, the technical solution provided by the present invention has the following excellent effects:

[0031] The recyclable top beam in the reusable constant resistance suspension top beam not only plays the role of conventional top beam in maintaining the surrounding rock, but also realizes the recycling and reuse of the entire set of constant resistance suspension top beams, effectively reducing the support cost. The simple protective space formed by the box-type top beam protects the shear from being damaged easily in complex environments.

[0032] The constant resistance pressure-relieving device installed in the constant resistance suspension top beam enables the anchor cable to drive the conical lock to slide in the metal tube when the anchor cable is subjected to a large force, thereby preventing the anchor cable from being broken due to a large stress; it realizes continuous pressure relief of the anchor cable under constant high-strength support resistance, effectively alleviating the damage to the cable body caused by instantaneous impact force, and the pressure relief range of the constant resistance pressure-relieving device can be set according to the engineering conditions, solving the problem of easy breakage of traditional anchor cables under conditions of large deformation of surrounding rock and impact load.

[0033] The constant resistance suspended top beam in the present invention is simple to operate and easy to use during application, and is particularly suitable for the advance support of the mining tunnels on both sides of the coal mining working face. It effectively solves the problems of occupying tunnel space and wasting manpower and material resources under the support of a single hydraulic pillar. When the tunnel behind the working face needs to be top-released, the constant resistance suspended top beam can effectively solve the problem of difficulty in top-release of the tunnel under conventional support. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of the installation of a reusable constant resistance suspended top beam in an embodiment of the present invention;

[0035] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0036] Figure 3 This is a schematic diagram of the structure of a recyclable top beam in an embodiment of the present invention;

[0037] Figure 4 Schematic diagram of the structure of an L-shaped metal block in an embodiment of the present invention;

[0038] Figure 5 It is a structural schematic diagram of a sliding gasket in an embodiment of the present invention;

[0039] Figure 6 Schematic diagram of the structure of the constant resistance pressure relief device in an embodiment of the present invention.

[0040] In the figure: 1. constant resistance pressure relief device; 2. recyclable top beam; 3. metal pipe; 4. spring; 5. conical lock; 51. wedge block; 6. shear; 7. box-type top beam; 8. outer cylinder; 9. sliding gasket; 10. pad; 11. anchor cable; 12. surrounding rock; 13. thread; 14. hole; 15. oil inlet; 16. oil outlet; 17. inner cylinder; 18. barrier plug; 19. metal block. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention belong to the scope of protection of the present invention.

[0042] In the description of the present invention, the terms "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present invention. The terms "connected" and "connected" used in the present invention should be understood in a broad sense. For example, they can be fixed connections or detachable connections; they can be directly connected or indirectly connected through intermediate components. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0043] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments. It should be noted that the embodiments and features in the embodiments of the present invention can be combined with each other without conflict.

[0044] According to a specific embodiment of the present invention, Figure 1-6 As shown, the present invention provides a reusable constant resistance suspension top beam, the reusable constant resistance suspension top beam comprises a recyclable top beam 2 and a constant resistance pressure-releasing device 1, the recyclable top beam 2 and the constant resistance pressure-releasing device 1 are both sleeved on the exposed end of the anchor cable 11 (that is, the part of the anchor cable 11 exposed from the surrounding rock 12); the recyclable top beam 2 comprises a shear 6 and a box-type top beam 7; the box-type top beam 7 is arranged close to the surrounding rock 12, the shear 6 is arranged in the protective space of the box-type top beam 7, the shear 6 is sleeved on the exposed end of the anchor cable 11, and the shear 6 is used to cut the anchor cable 11 to recover the constant resistance suspension top beam.

[0045] The shear 6 includes a hydraulic cylinder, a sliding gasket 9 and a shearing head. The hydraulic cylinder is used to provide a shearing force for shearing the anchor cable 11. The output end of the hydraulic cylinder is connected to the sliding gasket 9 to drive the sliding gasket 9 to move along the axial direction of the anchor cable 11. The shearing head is sleeved on the periphery of the anchor cable 11, and the shearing head and the sliding gasket 9 are slidably matched. The sliding gasket 9 pushes the shearing head to move radially toward the anchor cable 11 to shear the anchor cable 11. The shearing head shears the anchor cable 11, thereby realizing the recycling of the constant resistance suspension top beam and reducing the support cost of the tunnel.

[0046] The hydraulic cylinder includes an inner cylinder tube 17 and an outer cylinder tube 8. The inner cylinder tube 17 is sleeved on the anchor cable 11, and the upper end of the inner cylinder tube 17 is in contact with the shear head. The outer cylinder tube 8 is arranged on the periphery of the inner cylinder tube 17, and the outer cylinder tube 8 is the output end of the hydraulic cylinder. The outer cylinder tube 8 is provided with an oil inlet 15 and an oil outlet 16. The oil circuit is connected through the oil inlet 15 and the oil outlet 16 to control the movement of the outer cylinder tube 8 relative to the inner cylinder tube 17. An oil chamber is formed between the outer cylinder tube 8 and the inner cylinder tube 17. A blocking plug 18 is provided in the oil chamber. The blocking plug 18 is located between the oil inlet 15 and the oil outlet 16. The blocking plug 18 divides the oil chamber into two upper and lower oil chambers. The change of the oil amount in the upper and lower oil chambers drives the outer cylinder tube to move up and down. The hydraulic cylinder has a relatively simple structure and can provide a large pressure, which is convenient for the shear head to shear the anchor cable 11.

[0047] The sliding gasket 9 is sleeved on the periphery of the oil cylinder inner tube 17 , and the sliding gasket 9 slides along the guide of the oil cylinder inner tube 17 , so that the sliding of the sliding gasket 9 is more stable, thereby ensuring that the shearing head performs shearing stably.

[0048] The shearing head includes two metal blocks 19, which are L-shaped structures. The L-shaped metal blocks 19 include horizontal sides and vertical sides. The horizontal sides of the two metal blocks 19 are stacked on each other. Holes 14 are provided on the horizontal sides of the metal blocks 19, and the anchor cable 11 passes through the holes 14. The holes 14 are provided with grooves, which form thinner edges (sharper edges) on the metal blocks 19 to facilitate cutting of the anchor cable 11. Figure 3 As shown, when the two metal blocks 19 are sleeved on the periphery of the anchor cable 11, the center of the intersection of the overlapping surface of the horizontal sides of the two metal blocks 19 and the axis of the anchor cable 11 is defined as the center point, and the grooves on the two holes 14 are centrally symmetrical around the center point, that is, the two grooves form two sharp edges arranged opposite to each other, similar to the two sharp edges of a pair of scissors arranged opposite to each other, making it easier to cut the anchor cable 11.

[0049] The vertical sides of the two metal blocks 19 are respectively slidably matched with the two ends of the sliding gasket 9, and the distance between the vertical sides of the metal blocks and the inner tube of the oil cylinder is continuously shortened in the upward direction, that is, the sliding surface between the vertical sides of the metal blocks 19 and the sliding gasket 9 has an angle with the axial direction of the anchor cable 11, and the angle is an acute angle, that is, the contact surface between the sliding gasket 9 and the vertical side of the metal block 19 is an inclined surface, and the axial upward movement of the sliding gasket 9 pushes the two metal blocks 19 to move outward in opposite radial directions, thereby providing shear force for shearing the anchor cable 11.

[0050] The box-shaped top beam 7 is an I-beam. Preferably, the box-shaped top beam 7 is welded from two I-beams of the same type. The shear 6 is arranged in the protective space of the I-beam so that the shear 6 is completely protected by the I-beam.

[0051] The constant resistance pressure-releasing device 1 is fixed to the lower part of the recyclable top beam 2 and imprisoned at the exposed end of the anchor cable 11. The constant resistance pressure-releasing device 1 includes a metal tube 3, a spring 4 and a conical lock 5. The metal tube 3 is sleeved on the outer periphery of the anchor cable 11. The inner wall of the metal tube 3 is provided with a thread 13, which is a trapezoidal thread 13, and the inner bottom side length of the trapezoidal thread 13 is relatively small. The spring 4 is arranged in the thread 13, and the spring 4 is tangent to the two trapezoidal sides of the thread 13; the conical lock 5 is arranged on the anchor cable 11, and the conical lock 5 is fastened to the pipe mouth of the metal tube 3, and the minimum inner diameter of the conical lock 5 is smaller than the inner diameter of the metal tube 3, and the maximum inner diameter of the conical lock 5 is the same as the inner diameter of the metal tube 3. A wedge block 51 is provided between the conical lock 5 and the anchor cable 11, with the wedge-shaped tip of the wedge block 51 facing upward. When the anchor cable 11 drives the conical lock 5 to move upward, the conical lock 5 is more tightly fixed to the anchor cable 11 under the action of the wedge block 51, thereby ensuring that the conical lock 5 is firmly fixed to the anchor cable 11.

[0052] When the surrounding rock 12 deforms and applies a large stress to the anchor cable 11, the anchor cable 11 can drive the conical lock 5 to move inside the metal tube 3, thereby achieving continuous pressure relief of the anchor cable 11 under constant high-strength support resistance and avoiding damage and breakage of the anchor cable 11 due to huge stress.

[0053] The oil cylinder inner tube 17 in the hydraulic cylinder is an integrated structure with the metal tube 3, so that the integrity of the entire metal tube 3 is better, the structural strength is higher, and the structural components in the entire constant resistance suspension top beam are reduced. In other embodiments, the oil cylinder inner tube 17 and the metal tube 3 can also be detachably connected together by threads (such as Figure 2 and Figure 3 As shown in , the detachable connection facilitates the installation and disassembly of the constant resistance suspension top beam. A pad 10 is arranged on the periphery of the metal tube 3, and the pad 10 can be connected to the outer wall of the metal tube 3 by threading. The pad 10 and the bottom of the box-type top beam 7 stop and cooperate with each other. When the anchor cable 11 drives the conical lock 5 to move upward, due to the stopping effect between the pad 10 and the box-type top beam 7, the friction force will not drive the metal tube 3 and the inner cylinder 17 fixed together to squeeze the metal block 19 upward, ensuring that the two metal blocks 19 will not be subjected to a large static friction force, and it is convenient for the metal blocks 19 to move relative to each other to shear the anchor cable 11.

[0054] Preferably, a spring is further provided between the oil cylinder inner tube 8 and the anchor cable 11, the inner diameter of the oil cylinder inner tube 8 is equal to the inner diameter of the metal tube 3, a trapezoidal thread is provided on the inner diameter of the oil cylinder inner tube 8, and a spring 4 is provided in the trapezoidal thread, that is, the spring 4 passes through the metal tube 3 into the oil cylinder inner tube 8. The spring is provided in the oil cylinder inner tube 8 so that the length of the spring in the metal tube 3 can extend all the way into the oil cylinder inner tube 8, so that the tapered lock 5 can slide all the way into the oil cylinder inner tube 8, that is, the sliding stroke of the tapered lock 5 in the metal tube 3 and the oil cylinder inner tube 8 is increased, so that the anchor cable 11 can adapt to a larger range of surrounding rock deformation.

[0055] When using the constant resistance suspension top beam, first drill a hole in the tunnel and install the anchor cable 11. After the anchoring agent solidifies, pass the recyclable top beam 2 and the constant resistance pressure-relieving device 1 through the exposed end of the anchor cable 11 in sequence. The recyclable top beam 2 is close to the surrounding rock 12, and the conical lock 5 is locked at the bottom of the constant resistance pressure-relieving device 1. When the surrounding rock 12 is deformed, the deformation of the surrounding rock 12 drives the anchor cable 11 to move, and the anchor cable 11 drives the conical lock 5 to move. The conical lock 5 first squeezes the spring 4. When the anchor cable 11 is deformed to a certain value, the spring 4 is completely squeezed into the thread 13. At this time, the anchor cable 11 drives the conical lock 5 to slide in the metal pipe 3; it avoids the anchor cable 11 being damaged and broken due to high stress, thereby achieving the release of the pressure of the surrounding rock 12 and the support of the constant resistance of the anchor cable 11.

[0056] When recovering the constant resistance suspension top beam, the oil delivery pipe is connected to the oil inlet 15 on the upper part of the cylinder outer tube 8, and hydraulic oil is inputted, and at the same time, the oil outlet pipe is connected to the oil outlet 16 on the lower part of the cylinder outer tube 8, and the hydraulic oil is squeezed out; the cylinder outer tube 8 moves upward relative to the cylinder inner tube 17, and the cylinder outer tube 8 pushes the sliding gasket 9 to move axially upward along the anchor cable 11, and the sliding gasket 9 pushes the metal block 19 to move radially outward along the anchor cable 11, so that the metal block 19 shears the anchor cable 11. When the shear force exceeds the ultimate strength of the anchor cable 11, the anchor cable 11 is cut off, so that the constant resistance suspension top beam and the anchor cable 11 are separated from each other, thereby realizing the recovery and reuse of the entire constant resistance suspension top beam.

[0057] To sum up, the recyclable top beam in the constant resistance suspension top beam provided by the present invention not only plays the role of conventional top beam in maintaining surrounding rock, but also realizes the recycling and reuse of the entire set of constant resistance suspension top beams, effectively reducing the support cost. The simple protective space formed by the box-type top beam protects the shear from being easily damaged in complex environments.

[0058] The constant resistance suspended top beam in the present invention is simple to operate and easy to use during application, and is particularly suitable for the advance support of the mining tunnels on both sides of the coal mining working face. It effectively solves the problems of occupying tunnel space and wasting manpower and material resources under the support of a single hydraulic pillar. When the tunnel behind the working face needs to be top-released, the constant resistance suspended top beam can effectively solve the problem of difficulty in top-release of the tunnel under conventional support.

[0059] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention are within the scope of protection of the pending claims of the present invention.

Claims

1. A reusable constant resistance suspension top beam, characterized in that: The constant resistance suspension top beam comprises a recyclable top beam and a constant resistance pressure relief device, wherein the constant resistance pressure relief device is fixed to the lower part of the recyclable top beam, and the recyclable top beam comprises: A box-type top beam, wherein the box-type top beam is arranged close to the surrounding rock, a protective space is formed inside the box-type top beam, and an anchor cable passes through the box-type top beam and is anchored on the surrounding rock; A shear, the shear is arranged inside the protective space of the box-type top beam, the shear is sleeved on the exposed end of the anchor cable, and is used to shear the anchor cable so as to recover the constant resistance suspension top beam, the shear comprises a hydraulic cylinder, a sliding gasket and a shear head; The movable cylinder body of the hydraulic cylinder is connected to the sliding gasket to drive the sliding gasket to move along the axial direction of the anchor cable; The shear head is sleeved on the anchor cable, the shear head is slidably matched with the sliding gasket, the sliding gasket pushes the shear head to move radially toward the anchor cable to shear the anchor cable, and the hydraulic cylinder includes: An oil cylinder inner tube, wherein the oil cylinder inner tube is sleeved on the anchor cable, and the upper end of the oil cylinder inner tube abuts against the shear head; An oil cylinder outer tube, the oil cylinder outer tube is arranged on the periphery of the oil cylinder inner tube, the upper end of the oil cylinder outer tube abuts against the lower wall surface of the sliding gasket, two oil chambers are formed between the oil cylinder outer tube and the oil cylinder inner tube, and the oil volume change in the two oil chambers drives the oil cylinder outer tube to move up and down, thereby pushing the sliding gasket to move, and the oil cylinder outer tube is the movable cylinder body of the hydraulic cylinder; The constant resistance pressure-releasing device comprises: A metal tube, wherein the metal tube is sleeved on the outer periphery of the anchor cable, and a thread is provided on the inner wall of the metal tube; a spring, the spring being disposed in the thread; A conical lock, the conical lock is fastened to the anchor cable, the conical lock is arranged at the mouth of the metal pipe, the minimum outer diameter of the conical lock is smaller than the inner diameter of the metal pipe, and the maximum outer diameter of the conical lock is the same as the inner diameter of the metal pipe; The oil cylinder inner tube and the metal pipe are detachably connected together through threads.

2. The reusable constant resistance suspension top beam according to claim 1, characterized in that: The outer cylinder is provided with an oil inlet and an oil outlet, and an oil circuit is connected through the oil inlet and the oil outlet to control the movement of the outer cylinder relative to the inner cylinder; A blocking plug is arranged in the oil cavity so as to divide the oil cavity between the oil cylinder outer tube and the oil cylinder inner tube into two, and the blocking plug is located between the oil inlet and the oil outlet.

3. The reusable constant resistance suspension top beam according to claim 1, characterized in that: The shearing head comprises two metal blocks, and the metal blocks are L-shaped; The transverse sides of the metal blocks are stacked on each other, and holes are provided on the transverse sides of the two metal blocks, and the anchor cables pass through the holes; The vertical sides of the two metal blocks are respectively slidably matched with the two ends of the sliding gasket, and the distance between the vertical sides of the metal blocks and the inner tube of the oil cylinder is continuously shortened in the upward direction; The hole is provided with a groove. When the two metal blocks are sleeved on the outer periphery of the anchor cable, the center of the intersection of the overlapping surfaces of the two metal blocks and the axis of the anchor cable is defined as the center point, and the two grooves are centrally symmetrical around the center point.

4. The reusable constant resistance suspension top beam according to any one of claims 1 to 3, characterized in that: The box-shaped top beam is formed by two I-beams fixedly connected.

5. The reusable constant resistance suspension top beam according to claim 1, characterized in that: The thread is a trapezoidal thread, and the spring is tangent to two side edges of the trapezoidal thread.

6. The reusable constant resistance suspension top beam according to claim 1, characterized in that: A pad is connected to the outer periphery of the metal tube, and the pad is sleeved on the outer wall of the metal tube. The pad and the bottom of the box-shaped top beam block each other to prevent the metal tube from moving upward.

7. The reusable constant resistance suspension top beam according to claim 1, characterized in that: The sliding gasket is sleeved on the outer periphery of the oil cylinder inner tube, and the sliding gasket slides along the guide of the oil cylinder inner tube.

Images