Open pit mine slope reinforcement device

Abstract

The present invention relates to the technical field of slope protection, and specifically to an open-pit mine slope reinforcement device, comprising a protective net and a combined anchor rod detachably connected to the protective net, wherein the combined anchor rod comprises a plurality of groups of fixing structures arranged in the same axial direction, and adjacent fixing structures are fixed by adjusting structures, and an extrusion structure is arranged inside the fixing structures, and the extrusion structure is used to improve the stability of the fixing structure and the inner wall of the borehole; according to the depth of the borehole, a suitable number of fixing cylinders are selected, and the adjusting structure is threadedly connected to a threaded structure at one end of a group of sliding rods; after one group of sliding rods is installed, one end of another group of sliding rods is connected to the adjusting structure by the threaded structure, so that the length of the combined anchor rod can be adjusted according to the depth of the borehole, thereby improving the convenience of use.

Description

Technical Field

[0001] The invention relates to the technical field of slope protection, and in particular to an open-pit mine slope reinforcement device. Background Art

[0002] At present, the slopes of open-pit mines are very easy to slide down after being exposed to natural wind and rain, and are prone to large-scale landslides, which cause great harm to the lives and safety of workers, and even threaten the residents under the mines in serious cases.

[0003] At present, the slope landslide reinforcement treatment method usually adopts the combination of slope protection net and anchor rod for reinforcement. Since drilling operation needs to be performed before installing the anchor rod, due to different geological conditions, it is easy to cause the drilling depth to be unable to match the anchor rod, but the length of the anchor rod cannot be adjusted according to the actual drilling depth. Therefore, an open-pit mine slope reinforcement device is proposed, which is convenient for adjusting the length of the anchor rod according to the actual drilling depth, so as to meet the installation requirements of drilling holes of different depths and improve the stability of the anchor rod. Summary of the invention

[0004] In response to the problems in the prior art, the present invention provides an open-pit mine slope reinforcement device to facilitate the adjustment of the length of the anchor rod according to the actual drilling depth, so as to meet the installation requirements of drilling holes of different depths and improve the stability of the anchor rod.

[0005] The technical solution adopted by the present invention to solve its technical problem is an open-pit mine slope reinforcement device, including a protective net and a combined anchor rod detachably connected to the protective net, the combined anchor rod includes a plurality of groups of fixed structures arranged in the same axial direction, adjacent fixed structures are fixed by adjustment structures, and an extrusion structure is provided inside the fixed structure, and the extrusion structure is used to improve the stability of the fixed structure and the inner wall of the borehole.

[0006] Specifically, the fixing structure includes a fixing cylinder, a horizontally arranged sliding rod is slidably connected inside the fixing cylinder, both ends of the sliding rod are provided with a threaded structure, adjacent sliding rods are fixed by an adjustment structure, and an extrusion structure is provided inside the fixing cylinder.

[0007] Specifically, the adjustment structure includes an inner sleeve, an extrusion plate is fixedly connected to the interior of the inner sleeve, a threaded structure is provided inside the inner sleeve, the inner sleeve is located between adjacent fixed cylinders, a threaded structure at one end of a group of sliding rods is threadedly connected to one end of the inner sleeve, an end of the inner sleeve away from a group of sliding rods is threadedly connected to a threaded structure of another group of sliding rods, end faces of the two adjacent groups of sliding rods are respectively extruded and contacted with both sides of the extrusion plate, an outer sleeve is slidably connected to the outer side of the inner sleeve, and both end faces of the outer sleeve are respectively extruded and contacted with end faces of adjacent fixed cylinders;

[0008] An adjustable driving structure is provided at one end of the sliding rod away from the inner sleeve, and the adjustable driving structure is used to drive the sliding rod to move.

[0009] Specifically, the extrusion structure includes a plurality of groups of circumferentially distributed grooves inside the fixed cylinder, a plurality of groups of circumferentially distributed sliding grooves are provided on the outside of the fixed cylinder, the sliding grooves correspond to the grooves, a first wedge block is slidably connected in each of the sliding grooves, a plurality of groups of circumferentially distributed second wedge blocks are fixedly connected to the sliding rod, the second wedge blocks are located in the grooves and slidably connected to the grooves, and the second wedge blocks are in extrusion contact with the first wedge blocks.

[0010] Specifically, the adjustable driving structure includes a square nut, and one end of the sliding rod away from the inner sleeve is threadedly connected to the square nut. Several groups of elastic steel plates are provided on the outside of the square nut. One end of the elastic steel plate is fixedly connected to the outside of the square nut, and the other end of the elastic steel plate is fixedly connected to a lifting ring, which is used to fix the protective net.

[0011] Specifically, a stop block is provided on one side of the first wedge-shaped block close to the sliding rod.

[0012] Specifically, a drill bit is provided at one end of the combined anchor rod away from the square nut, and the drill bit is threadedly connected to one end of the sliding rod.

[0013] Specifically, the outer side of the fixing tube is provided with a plurality of groups of screw-in threads.

[0014] Beneficial effects of the present invention:

[0015] An open-pit mine slope reinforcement device described in the present invention selects a suitable number of fixing cylinders according to the depth of the drilled hole, and relies on an adjustment structure to threadedly connect with a threaded structure at one end of a group of sliding rods. After one group of sliding rods is installed, one end of another group of sliding rods is connected to the adjustment structure through the threaded structure. In this way, the length of the combined anchor rod can be adjusted according to the depth of the drilled hole, thereby improving ease of use.

[0016] According to the open-pit mine slope reinforcement device described in the present invention, after several groups of fixed cylinders are assembled and placed in a borehole, a square nut is threadedly connected to one end of a sliding rod located at the outermost side, and the square nut is rotated, so as to facilitate the synchronous movement of all sliding rods; when the sliding rod moves to a certain position, the second wedge block is squeezed into contact with the first wedge block, and the first wedge block is squeezed outward, so as to improve the stability between the fixed cylinder and the inner wall of the borehole.

[0017] According to the open-pit mine slope reinforcement device described in the present invention, during the installation of the protective net, the elastic steel plate on the outside of the square nut should be bent first, and the bending direction of the elastic steel plate should be the same as the direction of rotation when the square nut drives the sliding rod to move outward. After the elastic steel plate is bent, it is connected to the protective net by a lifting ring, and the rebound of the elastic steel plate generates tension on the corners of the protective net, thereby improving the stability of the protective net. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0019] Figure 1 This is a schematic diagram of the connection structure of a combined anchor rod and a protective net after installation according to an embodiment of the present invention;

[0020] Figure 2 An axonometric view of a combined anchor rod according to an embodiment of the present invention;

[0021] Figure 3 This is a schematic diagram of the connection of a fixed cylinder according to an embodiment of the present invention;

[0022] Figure 4 This is a schematic diagram of the outer sleeve connection according to an embodiment of the present invention;

[0023] Figure 5 For the present invention Figure 2 Schematic diagram of the enlarged structure of region B;

[0024] Figure 6 For the present invention Figure 2 Schematic diagram of the enlarged structure of the C region;

[0025] Figure 7 A cross-sectional view of a fixed cylinder according to an embodiment of the present invention;

[0026] Figure 8 This is a schematic cross-sectional view of the outer sleeve structure of an embodiment of the present invention;

[0027] Fig. 9 This is a schematic structural diagram of an initial state of a first wedge block according to an embodiment of the present invention;

[0028] Fig.10 This is a schematic diagram of the connection structure of the first wedge-shaped block after being squeezed and moved according to an embodiment of the present invention;

[0029] Fig.11 For the present invention Figure 1 A schematic diagram of the enlarged structure of region A;

[0030] In the figure: 1, protective net; 2, fixed cylinder; 3, sliding rod; 4, inner sleeve; 5, extrusion plate; 6, outer sleeve; 7, slot; 8, sliding groove; 9, first wedge block; 10, second wedge block; 11, square nut; 12, elastic steel plate; 13, lifting ring; 14, stopper; 15, drill bit; 16, screw-in thread. DETAILED DESCRIPTION

[0031] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0032] In order to adjust the length of the anchor rod according to the actual drilling depth, as an embodiment of the present invention, Figure 1 , Figure 2 As shown, an open-pit mine slope reinforcement device of the present invention includes a protective net 1 and a combined anchor rod detachably connected to the protective net 1, the combined anchor rod includes a plurality of groups of fixed structures arranged in the same axial direction, adjacent fixed structures are fixed by adjusting structures, and an extrusion structure is provided inside the fixed structure, which is used to improve the stability of the fixed structure and the inner wall of the borehole.

[0033] When in use, when slope protection is required, first use a drilling machine to drill holes at the locations where the combined anchor rods are to be installed. After the drilling is completed, the combined anchor rods are assembled according to the depth of the holes to meet the depth of the holes. When the combined anchor rods need to be assembled, a suitable number of fixed structures are selected according to the depth of the holes, and several groups of fixed structures are connected by means of adjustment structures to keep the adjacent fixed structures stable. After several groups of fixed structures are assembled, the fixed structures are placed in the holes, and the extrusion structure can be opened at this time. The extrusion structure can be used to improve the stability of the fixed structures and the inner wall of the holes, and prevent the fixed structures from slipping off the holes.

[0034] When fixed structures are installed in several groups of drill holes, the corners of the protection net 1 can be installed on different fixed structures respectively. The fixed structures can be used to support the protection net 1, and the protection net 1 can be used to protect the slope.

[0035] In order to facilitate the adjustment of the length of the combined anchor rod, for example, Figure 2 , Figure 3 , Figure 4As shown, the present invention also includes that the fixed structure includes a fixed cylinder 2, and a horizontally arranged sliding rod 3 is slidably connected inside the fixed cylinder 2. Both ends of the sliding rod 3 are provided with a threaded structure, and adjacent sliding rods 3 are fixed by an adjustment structure, and an extrusion structure is provided inside the fixed cylinder 2.

[0036] When in use, according to the depth of the drilling hole, a suitable number of fixing tubes 2 are selected, and the adjusting structure is threadedly connected with the threaded structure at one end of a group of sliding rods 3. After one group of sliding rods 3 is installed, one end of another group of sliding rods 3 is connected to the adjusting structure through the threaded structure, so that the length of the combined anchor rod can be adjusted according to the depth of the drilling hole, thereby improving the convenience of use;

[0037] When the sliding rods 3 in several groups of fixed cylinders 2 are installed through the adjustment structure, the several groups of completed fixed cylinders 2 are placed in the drilled hole to facilitate the subsequent driving of the extrusion structure, thereby further improving the stability of the fixed cylinder 2 and the inner wall of the drilled hole and preventing the fixed cylinder 2 from slipping off the drilled hole.

[0038] In order to facilitate the assembly of several groups of fixed cylinders 2, for example, Figure 3 , Figure 4 , Figure 8 As shown, the present invention also includes that the adjustment structure includes an inner sleeve 4, an extrusion plate 5 is fixedly connected inside the inner sleeve 4, a threaded structure is provided inside the inner sleeve 4, the inner sleeve 4 is located between adjacent fixed cylinders 2, a threaded structure at one end of a group of sliding rods 3 is threadedly connected to one end of the inner sleeve 4, an end of the inner sleeve 4 away from one group of sliding rods 3 is threadedly connected to the threaded structure of another group of sliding rods 3, the end faces of the two adjacent groups of sliding rods 3 are respectively extruded and contacted with both sides of the extrusion plate 5, an outer sleeve 6 is slidably connected to the outer side of the inner sleeve 4, and both end faces of the outer sleeve 6 are respectively extruded and contacted with the end faces of the adjacent fixed cylinders 2;

[0039] An adjustable driving structure is provided at one end of the sliding rod 3 away from the inner sleeve 4 , and the adjustable driving structure is used to drive the sliding rod 3 to move.

[0040] When in use, after one end of the inner sleeve 4 is threadedly connected to one end of a group of sliding rods 3, the outer sleeve 6 is sleeved on the outside of the inner sleeve 4. At this time, another group of sliding rods 3 can be threadedly connected to the other end of the inner sleeve 4, so as to assemble the adjacent fixed cylinders 2. After the adjacent sliding rods 3 are connected to the internal threads of the inner sleeve 4, one end of the two groups of sliding rods 3 are close to each other and finally squeezed and contacted with the side of the extrusion plate 5 inside the inner sleeve 4, so as to complete the assembly of the sliding rods 3. The extrusion plate 5 can further improve the stability of the sliding rods 3.

[0041] After assembling several groups of fixed tubes 2 according to the depth of the borehole, the assembled fixed tubes 2 are placed in the borehole, and the sliding rod 3 is driven to move by the adjustable driving structure. When the sliding rod 3 moves, the extrusion structure is driven. The stability of the fixed tube 2 and the inner wall of the borehole can be further improved by the extrusion structure, and the fixed tube 2 and the borehole can be prevented from slipping off. At the same time, when the sliding rod 3 moves, the inner sleeve 4 is driven to move synchronously, thereby driving the adjacent sliding rods 3 to move, thereby driving all the extrusion structures, and improving the stability of the connection between the combined anchor rod and the borehole;

[0042] It should be pointed out that the inner sleeve 4 of the present invention is shorter than the outer sleeve 6 , so as to facilitate the sliding connection between the inner sleeve 4 and the inner wall of the outer sleeve 6 .

[0043] In order to further improve the stability between the combined anchor rod and the inner wall of the borehole, for example, Figure 3 , Figure 4 , Figure 7 , Figure 8 , Fig. 9 , Fig.10 As shown, the present invention also includes that the extrusion structure includes a plurality of groups of circumferentially distributed grooves 7 inside the fixed cylinder 2, a plurality of groups of circumferentially distributed sliding grooves 8 are provided on the outer side of the fixed cylinder 2, the sliding grooves 8 correspond to the grooves 7, and the sliding grooves 8 are slidably connected with first wedge blocks 9, and a plurality of groups of circumferentially distributed second wedge blocks 10 are fixedly connected to the sliding rod 3, the second wedge blocks 10 are located in the grooves 7 and slidably connected with the grooves 7, and the second wedge blocks 10 are in extrusion contact with the first wedge blocks 9.

[0044] When in use, after the sliding rods 3 inside the adjacent fixed tubes 2 are fixed by the inner sleeve 4 and the outer sleeve 6, the assembled combined anchor rod is placed in the borehole, and the sliding rod 3 is driven to move by the adjustable driving structure. When the sliding rod 3 moves, it drives the second wedge block 10 to move synchronously. The second wedge block 10 is slidably connected to the inner wall of the slot 7. The slot 7 can improve the movement stability of the second wedge block 10. When the second wedge block 10 moves synchronously to a certain position, the second wedge block 10 is squeezed and contacted with the first wedge block 9, and the first wedge block 9 is driven to move by squeezing. When the first wedge block 9 moves, it is slidably connected to the sliding groove 8, and is squeezed and contacted with the inner wall of the borehole by the outward movement of the first wedge block 9, so as to further improve the stability between the combined anchor rod and the inner wall of the borehole.

[0045] In order to improve the stability of the protection net 1, exemplary, as Figure 2 , Figure 5 , Fig.11As shown, the present invention also includes that the adjustable driving structure includes a square nut 11, one end of the sliding rod 3 away from the inner sleeve 4 is threadedly connected to the square nut 11, a plurality of groups of elastic steel plates 12 are provided on the outer side of the square nut 11, one end of the elastic steel plate 12 is fixedly connected to the outer side of the square nut 11, and the other end of the elastic steel plate 12 is fixedly connected to a lifting ring 13, and the lifting ring 13 is used to fix the protective net 1.

[0046] When in use, after several groups of fixed cylinders 2 are assembled and placed in the drilled hole, the square nut 11 is threadedly connected to one end of the sliding rod 3 located at the outermost side, and the square nut 11 is rotated. When the square nut 11 rotates, the sliding rod 3 is driven to move. When the sliding rod 3 moves, the first wedge block 9 is driven to move in the slot 7. At the same time, the inner sleeve 4 drives the adjacent sliding rod 3 to move, so as to facilitate the synchronous movement of all the sliding rods 3. When the sliding rod 3 moves to a certain position, the second wedge block 10 is pressed and contacted with the first wedge block 9, and the first wedge block 9 is pressed and moved outward, so as to improve the stability between the fixed cylinder 2 and the inner wall of the drilled hole.

[0047] When the combined anchor rods are installed in several groups of drill holes, the corners of the protection net 1 can be installed on the combined anchor rods of different drill holes, and the corners of the protection net 1 can be connected by the action of the lifting ring 13, so as to fix the corners of the protection net 1;

[0048] It should be pointed out that during the installation of the protective net 1, the elastic steel plate 12 on the outside of the square nut 11 should be bent first, and the bending direction of the elastic steel plate 12 should be the same as the direction of rotation when the square nut 11 drives the sliding rod 3 to move outward. After the elastic steel plate 12 is bent, it is connected to the protective net 1 by the lifting ring 13, and the elastic steel plate 12 is relied on to generate tension on the corners of the protective net 1 by the rebound, so as to improve the stability of the protective net 1;

[0049] Relying on the rebound effect of the elastic steel plate 12, a torsional force is generated on the square nut 11, thereby further improving the driving effect of the square nut 11 on the sliding rod 3 and ensuring the stability of the sliding rod 3 after movement;

[0050] It should be pointed out that grouting can be performed inside the borehole that needs grouting according to actual construction conditions, so as to further improve the stability between the fixing tube 2 and the inner wall of the borehole.

[0051] In order to further improve the movement stability of the first wedge block 9, as Figure 8 As shown, the present invention also includes that a stopper 14 is provided on one side of the first wedge block 9 close to the sliding rod 3 .

[0052] When in use, the stopper 14 can prevent the first wedge block 9 from being separated from the sliding groove 8 , and the stopper 14 can further improve the movement stability of the first wedge block 9 .

[0053] For example, Figure 2 , Figure 6 As shown, the present invention also includes that a drill bit 15 is provided at one end of the combined anchor rod away from the square nut 11 , and the drill bit 15 is threadedly connected to one end of the sliding rod 3 .

[0054] When in use, after the assembly of several groups of fixing tubes 2 is completed, the drill bit 15 is installed, and the drill bit 15 is used to facilitate the placement of several groups of fixing tubes 2 into the drill hole;

[0055] It should be pointed out that after the drill bit 15 of the present invention is installed, the drill bit 15 is not in compression contact with one end of the fixed tube 2. When the drill bit 15 and the fixed tube 2 are placed in the drill hole, the sliding rod 3 is driven to move by the nut. When the sliding rod 3 moves, it drives the drill bit 15 to move synchronously and is in compression contact with one end of the fixed tube 2, thereby completing the installation of several groups of fixed tubes 2.

[0056] For example, Figure 3 As shown, the present invention also includes that the outer side of the fixing cylinder 2 is provided with a plurality of groups of screw-in threads 16 .

[0057] When in use, several screw-in threads 16 can further facilitate placing several groups of fixing tubes 2 into the drilled holes.

[0058] When the present invention is in use, when it is necessary to protect the slope, first use a drilling machine to drill holes at the positions where the combined anchor rods are required to be installed. After the drilling is completed, the combined anchor rods are assembled according to the depth of the drilled holes to meet the depth of the drilled holes. When it is necessary to assemble the combined anchor rods, a suitable number of fixing tubes 2 are selected according to the depth of the drilled holes. After one end of the inner sleeve 4 is threadedly connected to one end of a group of sliding rods 3, the outer sleeve 6 is sleeved on the outside of the inner sleeve 4. At this time, another group of sliding rods 3 can be threadedly connected to the other end of the inner sleeve 4 to assemble the adjacent fixing tubes 2. After the adjacent sliding rods 3 are all connected to the internal threads of the inner sleeve 4, one end of the two groups of sliding rods 3 are close to each other and finally squeezed and contacted with the side of the extrusion plate 5 inside the inner sleeve 4 to complete the assembly of the sliding rod 3. The extrusion plate 5 can further improve the stability of the sliding rod 3.

[0059] After the assembly of several groups of fixing tubes 2 is completed, the drill bit 15 is installed, and the drill bit 15 is used to facilitate the placement of several groups of fixing tubes 2 into the drilled holes;

[0060] After several groups of fixed cylinders 2 are assembled and placed in the drilled hole, the square nut 11 is threadedly connected to one end of the outermost sliding rod 3, and the square nut 11 is rotated. When the square nut 11 rotates, the sliding rod 3 is driven to move. When the sliding rod 3 moves, the first wedge block 9 is driven to move in the slot 7. At the same time, the inner sleeve 4 drives the adjacent sliding rod 3 to move, so as to facilitate the synchronous movement of all the sliding rods 3. When the sliding rod 3 moves to a certain position, the second wedge block 10 is pressed and contacted with the first wedge block 9, and the first wedge block 9 is pressed and moved outward, so as to improve the stability between the fixed cylinder 2 and the inner wall of the drilled hole.

[0061] First, bend the elastic steel plate 12 outside the square nut 11. The bending direction of the elastic steel plate 12 should be the same as the direction of rotation when the square nut 11 drives the sliding rod 3 to move outward. After the elastic steel plate 12 is bent, it is connected to the protective net 1 by the lifting ring 13. The elastic steel plate 12 generates tension on the corners of the protective net 1 by the rebound of the elastic steel plate 12, thereby improving the stability of the protective net 1.

[0062] Relying on the rebound effect of the elastic steel plate 12, a torsional force is generated on the square nut 11, thereby further improving the driving effect of the square nut 11 on the sliding rod 3 and ensuring the stability of the sliding rod 3 after movement;

[0063] Grouting can be performed inside the borehole that requires grouting according to actual construction conditions, so as to further improve the stability between the fixing tube 2 and the inner wall of the borehole.

[0064] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. An open-pit mine slope reinforcement device, characterized in that: It comprises a protective net (1), and a combined anchor rod detachably connected to the protective net (1), the combined anchor rod comprising a plurality of groups of fixing structures arranged in the same axial direction, adjacent fixing structures being fixed by means of adjustment structures, and each fixing structure being provided with an extrusion structure inside, the extrusion structure being used to improve the stability of the fixing structure and the inner wall of the borehole; The fixing structure comprises a fixing cylinder (2), a horizontally arranged sliding rod (3) is slidably connected inside the fixing cylinder (2), both ends of the sliding rod (3) are provided with a threaded structure, adjacent sliding rods (3) are fixed by an adjustment structure, and an extrusion structure is provided inside the fixing cylinder (2); The adjustment structure comprises an inner sleeve (4), an extrusion plate (5) is fixedly connected to the inner part of the inner sleeve (4), a threaded structure is provided inside the inner sleeve (4), the inner sleeve (4) is located between adjacent fixed cylinders (2), the threaded structure at one end of a group of sliding rods (3) is threadedly connected to one end of the inner sleeve (4), the end of the inner sleeve (4) away from the one group of sliding rods (3) is threadedly connected to the threaded structure of another group of sliding rods (3), the end faces of the two adjacent groups of sliding rods (3) are respectively in extrusion contact with the two sides of the extrusion plate (5), the outer side of the inner sleeve (4) is slidably connected to the outer sleeve (6), and the two end faces of the outer sleeve (6) are respectively in extrusion contact with the end faces of the adjacent fixed cylinders (2); An adjustable driving structure is provided at one end of the sliding rod (3) away from the inner sleeve (4), and the adjustable driving structure is used to drive the sliding rod (3) to move; The extrusion structure comprises a plurality of groups of circumferentially distributed slots (7) inside the fixed cylinder (2), a plurality of groups of circumferentially distributed sliding slots (8) are provided on the outside of the fixed cylinder (2), the sliding slots (8) correspond to the slots (7), a first wedge block (9) is slidably connected in each of the sliding slots (8), a plurality of groups of circumferentially distributed second wedge blocks (10) are fixedly connected to the sliding rod (3), the second wedge blocks (10) are located in the slots (7) and are slidably connected to the slots (7), and the second wedge blocks (10) are in extrusion contact with the first wedge blocks (9); The adjustable driving structure comprises a square nut (11), one end of the sliding rod (3) away from the inner sleeve (4) is threadedly connected to the square nut (11), a plurality of groups of elastic steel plates (12) are provided on the outer side of the square nut (11), one end of the elastic steel plate (12) is fixedly connected to the outer side of the square nut (11), and the other end of the elastic steel plate (12) is fixedly connected to a lifting ring (13), and the lifting ring (13) is used to fix the protective net (1); A stopper (14) is provided on one side of the first wedge-shaped block (9) close to the sliding rod (3); A drill bit (15) is provided at one end of the combined anchor rod away from the square nut (11), and the drill bit (15) is threadedly connected to one end of the sliding rod (3); The outer side of the fixing cylinder (2) is provided with a plurality of sets of screw-in threads (16); During the installation of the protective net (1), the elastic steel plate (12) on the outside of the square nut (11) is first bent. The bending direction of the elastic steel plate (12) should be the same as the direction of rotation when the square nut (11) drives the sliding rod (3) to move outward. After the elastic steel plate (12) is bent, it is connected to the protective net (1) by means of the lifting ring (13). The elastic steel plate (12) generates tension on the corners of the protective net (1) by means of the rebound effect of the elastic steel plate (12), thereby improving the stability of the protective net (1); the square nut (11) is generated with a torsion force by means of the rebound effect of the elastic steel plate (12), thereby further improving the driving effect of the square nut (11) on the sliding rod (3), thereby ensuring the stability of the sliding rod (3) after movement.

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