Coal mine tunnel supporting anchor net fixing device and fixing method

Abstract

A coal mine roadway supporting anchor net fixing device comprises a plurality of anchor rods and a plurality of auxiliary fixers, the anchor rods are used for fixing a plurality of first point positions on an anchor net to the inner wall of a roadway, the auxiliary fixers are used for fixing a plurality of second point positions on the anchor net to the inner wall of the roadway, and the first point positions and the second point positions are staggered. The auxiliary fixator comprises at least one mounting plate, the mounting plate is fixed to the inner wall of the roadway through mounting bolts, the mounting plate is rotationally connected with a plurality of connecting rods with different orientations, the connecting rods are movably connected with lantern rings, and the lantern rings can be arranged on steel wires of the anchor net in a sleeving mode. According to the coal mine roadway supporting anchor net fixing device and method, through cooperation of the anchor rods and the auxiliary fixing devices, the anchor net can be fixed from multiple different point positions, the distance between the anchor net and the inner wall of a roadway is fully reduced, the phenomenon that an overhanging part appears on the anchor net is avoided, and the service life of the anchor net is prolonged. And damage caused by overlarge local stress due to the fact that the overhanging part bears a large number of broken stones is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of coal mine support, in particular to a device and method for fixing a coal mine tunnel support anchor net. Background Art

[0002] Coal mining in my country is primarily carried out underground, requiring the excavation of numerous tunnels. Maintaining smooth tunnels and stable surrounding rock using tunnel support is crucial for coal mine construction and production. The fundamental purpose of tunnel support is to mitigate and reduce surrounding rock movement, preventing excessive reduction in tunnel cross-section and preventing the collapse of dispersed and damaged surrounding rock. The effectiveness of tunnel support depends not only on the support capacity of the supports themselves but also on a range of factors, including the properties of the surrounding rock, the mechanical properties of the supports, the density of the supports, the timing of their installation, the quality of their installation, and the contact pattern with the surrounding rock.

[0003] In tunnel support technology, commonly used support tools include anchor rods, anchor nets, anchor cables, and steel sheds. Anchor net support is an active support method that uses preload to actively constrain rock deformation to increase overall bearing capacity. It can prevent surrounding rock debris from falling and ensure safety.

[0004] In existing technology, anchor nets are primarily secured at various locations using multiple anchor rods. However, because the inner walls of tunnels are not smooth but rather have numerous raised and recessed areas, the anchor net can smoothly cover the raised areas after being secured, but struggles to fit within the recessed areas. This results in overhangs in the anchor net, with a large space between them. When surrounding rock breaks off from the inner walls of the tunnel, the detached rock fragments converge toward the center of the overhang, causing concentrated stress on the overhang, which can lead to deformation or even damage to the anchor net, compromising the support effectiveness. Summary of the Invention

[0005] In order to address the deficiencies in the prior art, the present invention provides a coal mine tunnel support anchor net fixing device and fixing method. Through the cooperation of anchor rods and auxiliary fixers, the anchor net can be fixed from multiple different points, fully reducing the distance between the anchor net and the inner wall of the tunnel, avoiding the appearance of overhanging parts on the anchor net, and also avoiding the overhanging parts from bearing a large amount of gravel, resulting in local excessive force and damage.

[0006] In order to achieve the above object, the specific scheme adopted by the present invention is: A coal mine tunnel support anchor net fixing device includes multiple anchor rods and multiple auxiliary fixers, the anchor rods are used to fix multiple first points on the anchor net to the inner wall of the tunnel, the auxiliary fixers are used to fix multiple second points on the anchor net to the inner wall of the tunnel, and the first points and the second points are staggered, the auxiliary fixers include at least one mounting plate, and the mounting plate is fixed to the inner wall of the tunnel by mounting bolts, the mounting plate is rotatably connected to multiple connecting rods with different orientations, the connecting rods are movably connected to a ring, and the ring can be mounted on the steel wire of the anchor net.

[0007] Preferably, the auxiliary fixer includes two mounting plates, the two mounting plates are parallel to each other, and a distance is left between the two mounting plates to form an accommodating space, the mounting bolts pass through the two mounting plates in sequence, a rotating sleeve is provided in the middle of the mounting bolts, and the rotating sleeve is located in the accommodating space, and a plurality of connecting rods are evenly distributed on the circumference of the rotating sleeve and connected to the rotating sleeve.

[0008] Preferably, a plurality of screws evenly distributed along the circumferential direction are fixedly connected to the outer side wall of the rotating sleeve, and the screws extend radially along the rotating sleeve. The connecting rod is provided with screw holes extending along the length direction, and the screws are correspondingly inserted into the screw holes.

[0009] Preferably, the fixed sleeve on the circumferential side wall of the rotating sleeve is provided with two connecting rings, and a distance is left between the two connecting rings. The connecting ring is coaxially fixedly connected to a limiting ring, the two limiting rings are arranged opposite to each other, and a distance is left between the two limiting rings to form a channel, and a distance is left between the limiting ring and the rotating sleeve to form a movable space. After the screw passes through the channel, it is fixedly connected to a rotating block, and the rotating block can slide in the movable space to rotate around the rotating sleeve.

[0010] Preferably, a plurality of isolation blocks are fixedly arranged in the activity space, and the plurality of isolation blocks separate the activity space into a plurality of activity areas, and the rotating blocks are correspondingly arranged in the activity areas.

[0011] Preferably, the two mounting plates are fixedly connected via a plurality of support columns, and the screw rod passes between two adjacent support columns.

[0012] Preferably, one end of the connecting rod away from the rotating sleeve is fixedly connected to the collar via a connecting wire, and the collar is provided with an opening for the steel wire to pass through.

[0013] Preferably, the mounting bolts are configured as expansion bolts, and mounting holes matching the mounting bolts are provided on the inner wall of the tunnel.

[0014] A method for fixing a coal mine roadway support anchor net is based on the above-mentioned coal mine roadway support anchor net fixing device, and the method includes the following steps: Determining a support position of the anchor net based on a support requirement of the roadway, and determining the first point position and the second point position based on the support position of the anchor net; Drilling anchor holes for installing anchor rods and mounting holes for installing the mounting bolts on the inner wall of the tunnel; Using anchor rods to fix the first point on the anchor net to the inner wall of the tunnel; The auxiliary fixer is used to fix the second point on the anchor net to the inner wall of the tunnel.

[0015] Preferably, the method of fixing the second point on the anchor net to the inner wall of the tunnel using the auxiliary fixer includes: Installing the mounting bolts into the mounting holes to fix the mounting plate to the second point; Adjusting the angle of the connecting rod until the collar can contact the steel wire of the anchor net; The collar is placed on the steel wire.

[0016] The fixing device of the present invention can fix the anchor net from multiple different points through the cooperation of anchor rods and auxiliary fixers, fully reducing the distance between the anchor net and the inner wall of the tunnel, avoiding the occurrence of overhanging parts on the anchor net, and also avoiding the overhanging parts from bearing a large amount of gravel, resulting in local excessive force and damage. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 This is a schematic diagram of the fixing method of the anchor net; Figure 2 It is a schematic diagram of the cooperation between the auxiliary fixator and the steel wire; Figure 3 is a stereoscopic view of the auxiliary fixator; Figure 4 is a cross-sectional view of the auxiliary fixator; Figure 5 It is a schematic diagram of the connection between the screw and the rotating sleeve; Figure 6 It is a structural diagram of the connecting ring and the limiting ring.

[0019] Figure markings: 1-tunnel, 2-anchor net, 3-anchor rod, 4-auxiliary fixer, 5-steel wire, 6-mounting plate, 7-screw, 8-connecting rod, 9-connecting line, 10-ring, 11-mounting bolt, 12-opening, 13-support column, 14-accommodating space, 15-rotating sleeve, 16-through hole, 17-isolation block, 18-movement space, 19-rotating block, 20-limiting ring, 21-connecting ring. DETAILED DESCRIPTION

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0021] like Figure 1 and Figure 2 As shown, a coal mine tunnel support anchor net fixing device includes multiple anchor rods 3 and multiple auxiliary fixers 4, the anchor rods 3 are used to fix multiple first points on the anchor net to the inner wall of the tunnel 1, and the auxiliary fixers 4 are used to fix multiple second points on the anchor net 2 to the inner wall of the tunnel 1, and the first points and the second points are staggered, the auxiliary fixers 4 include at least one mounting plate 6, and the mounting plate 6 is fixed to the inner wall of the tunnel 1 by mounting bolts 11, the mounting plate 6 is rotatably connected to multiple connecting rods 8 with different directions, and the connecting rod 8 is movably connected to a ring 10, which can be sleeved on the steel wire 5 of the anchor net 2.

[0022] When securing the anchor net 2, first, the anchor rod 3 is used to secure the first point on the anchor net 2 to the inner wall of the tunnel 1. The first point can be determined based on the deployment position of the anchor rod 3. Subsequently, portions of the anchor net 2 that cannot be smoothly attached to the inner wall of the tunnel 1 are identified. These portions may be caused by depressions in the inner wall of the tunnel 1. These portions can be used as second points. The second points of the anchor net 2 are then secured to the inner wall of the tunnel 1 using the auxiliary fixture 4. Specifically, mounting bolts 11 are passed through the mesh of the anchor net 2 and secured to the inner wall of the tunnel 1, allowing one of the mounting plates 6 to fit against the inner wall of the tunnel 1. The connecting rod 8 is then rotated to change its angle until the collar 10 connected to the collar 8 fits over the steel wire 5 of the anchor net 2. Finally, the collar 10 is placed over the steel wire 5 to complete the securing of the second point. Because the mounting plate 6 is attached to the inner wall of the tunnel 1, the connecting rod 8 and the collar 10 cooperate to pull the steel wire 5 to a position close to the inner wall of the tunnel 1, so as to reduce the distance between the anchor net 2 and the inner wall of the tunnel 1, avoid the emergence of overhanging parts on the anchor net 2, and avoid the overhanging parts from bearing a large amount of gravel, resulting in local excessive force and damage.

[0023] The fixing device of the present invention can fix the anchor net 2 from multiple different points through the cooperation of the anchor rod 3 and the auxiliary fixer 4, fully reducing the distance between the anchor net 2 and the inner wall of the tunnel 1, avoiding the occurrence of overhanging parts on the anchor net 2, and also avoiding the overhanging parts from bearing a large amount of gravel, resulting in local excessive force and damage.

[0024] like Figure 3 and Figure 4 As shown, the specific structure of the auxiliary fixer 4 is as follows: the auxiliary fixer 4 includes two mounting plates 6, which are parallel to each other and separated by a space 14. A mounting bolt 11 passes through the two mounting plates 6 in sequence. A rotating sleeve 15 is positioned in the middle of the mounting bolt 11 and located in the space 14. Multiple connecting rods 8 are evenly distributed around and connected to the rotating sleeve 15. Based on this structure, the mounting bolt 11 can not only secure the mounting plates 6 to the inner wall of the tunnel 1, but also secure the rotating sleeve 15. The rotating sleeve 15 can rotate around the mounting bolt 11, thereby driving the connecting rods 8 to rotate synchronously, thereby changing the direction of the connecting rods 8 and ensuring that the collar 10 can be smoothly fitted onto the steel wire 5 of the anchor net 2. It should be noted that the inner diameter of the rotating sleeve 15 should be larger than the outer diameter of the screw portion of the mounting bolt 11 to ensure smooth rotation of the rotating sleeve 15 around the mounting bolt 11.

[0025] To further enhance the flexibility of connecting rod 8, and to enable the connection plate 8 to be adjusted in both direction and position by rotation, thereby fully ensuring that the collar 10 can be fitted onto the steel wire 5 of the anchor net 2, a plurality of screws 7 are fixedly connected to the outer wall of the rotating sleeve 15, evenly distributed along the circumference. The screws 7 extend radially along the rotating sleeve 15, and the connecting rod 8 is provided with screw holes extending along the length, into which the screws 7 are correspondingly inserted. By providing the screws 7 and coupling the connecting rod 8 with the screw holes through the screw holes, the connecting rod 8 can be rotated about its own axis to move axially, thereby changing the position of the connecting rod 8 relative to the mounting plate 6, that is, changing the overall length of the connecting rod 8 and the screws 7, thereby achieving the effect of changing the position of the end of the connecting rod 8. The change in the end position of the connecting rod 8 can cause the position of the collar 10 to change synchronously, thereby ensuring that the collar 10 can be smoothly fitted onto the steel wire 5.

[0026] like Figure 5 and Figure 6As shown, the specific connection method between the rotating sleeve 15 and the screw rod 7 is as follows: two connecting rings 21 are fixedly provided on the peripheral side wall of the rotating sleeve 15, and a distance is left between the two connecting rings 21. The connecting rings 21 are coaxially fixedly connected to the limit ring 20. The two limit rings 20 are arranged facing each other and a distance is left between the two limit rings 20 to form a channel. The distance between the limit ring 20 and the rotating sleeve 15 forms a movable space 18. After the screw rod 7 passes through the channel, it is fixedly connected to the rotating block 19. The rotating block 19 can slide in the movable space 18 to rotate around the rotating sleeve 15. The movable space 18 is formed by providing the connecting rings 21 and the limit rings 20. The rotating block 19 is then provided in the movable space 18 and connected to the screw rod 7. This ensures that the screw rod 7 can rotate smoothly around the rotating sleeve 15. At the same time, the limiting effect of the limit ring 20 on the rotating block 19 can protect the screw rod 7 and prevent it from falling off, thereby ensuring that the steel wire 5 can be smoothly pulled close to the inner wall of the tunnel 1.

[0027] To prevent adjacent rotating blocks 19 from colliding with each other, multiple isolation blocks 17 are fixedly installed in the movable space 18. These isolation blocks 17 divide the movable space 18 into multiple movable areas, with the rotating blocks 19 correspondingly positioned in these areas. The isolation blocks 17 confine the rotating blocks 19 to their respective movable areas, preventing collisions between adjacent rotating blocks 19. This also limits the rotational range of the screw rods 7, ensuring that the screw rods 7 and connecting rods 8 are oriented in different directions. This in turn ensures the flexibility of the auxiliary fixer 4, allowing the collar 10 of the auxiliary fixer 4 to be stably positioned on the steel wire 5 of the anchor net 2.

[0028] To enhance the structural strength of the auxiliary fixator 4, the two mounting plates 6 are fixedly connected by a plurality of support columns 13, with the screw 7 passing between two adjacent support columns 13. The support columns 13 not only support the two mounting plates 6, thereby ensuring the strength of the auxiliary fixator 4, but also restrict the connecting rod 8, limiting its rotational range.

[0029] The specific connection method between the connecting rod 8 and the collar 10 is as follows: the end of the connecting rod 8 away from the rotating sleeve 15 is fixedly connected to the collar 10 via a connecting wire 9. The collar 10 has an opening 12 for the steel wire 5 to pass through. The connection between the connecting rod 8 and the collar 10 is achieved by the connecting wire 9, allowing the collar 10 to flexibly rotate and move within a small range, fully ensuring that the collar 10 can be placed on the steel wire 5 of the anchor net 2. The simple structure eliminates the need for complex connectors, making operation easier. To ensure sufficient connection strength, the connecting wire 9 can be configured as a steel wire rope. Furthermore, the provision of the opening 12 in the collar 10 facilitates the insertion of the steel wire 5 into the collar 10, that is, the placement of the collar 10 on the steel wire 5. It should be noted that after the collar 10 is placed on the steel wire 5, it is necessary to rotate the collar 10 to prevent the steel wire 5 from passing through the opening 12 and being released from the collar 10 as the collar 10 pulls the steel wire 5 toward the inner wall of the tunnel 1.

[0030] Furthermore, the mounting bolts 11 are configured as expansion bolts, and mounting holes are provided on the inner wall of the tunnel 1 to match the mounting bolts 11. A through hole 16 is provided in the middle of the mounting plate 6 to allow the mounting bolts 11 to pass through. The use of expansion bolts can improve the stability of the mounting plate 6 and prevent the auxiliary fixer 4 from falling off.

[0031] When using multiple auxiliary anchors 4, a steel rope can be connected between the different auxiliary anchors 4. The ends of the steel ropes are connected to the rings 10 of the auxiliary anchors 4, thereby connecting the different auxiliary anchors 4 together. If an auxiliary anchor 4 falls off, the steel rope and the other auxiliary anchors 4 can cooperate to prevent the fallen auxiliary anchor 4 from falling completely. Because the length of the steel rope is fixed, the other auxiliary anchors 4 can also share the weight of the rock fragments carried by the overhanging portion of the anchor net 2 corresponding to the fallen auxiliary anchor 4, thereby strengthening the protection of the anchor net 2.

[0032] The present invention further provides a method for fixing a coal mine tunnel support anchor net. Based on the above-mentioned coal mine tunnel support anchor net fixing device, the method includes the following steps: S1. Determine the support position of anchor net 2 based on the support requirements of tunnel 1, and determine a first point and a second point based on the support position of anchor net 2. Specifically, the first point is determined based on the location of anchor rod 3. Because tunnel 1 support must comply with certain specifications, the location of anchor rod 3 is not arbitrary. Therefore, the first point cannot be determined arbitrarily and must be determined based on the location of anchor rod 3. The second point can be determined based on the actual condition of the inner wall of tunnel 1, with the portion of anchor net 2 corresponding to the depression on the inner wall of tunnel 1 serving as the second point.

[0033] S2, drilling an anchor hole for installing the anchor rod 3 and a mounting hole for installing the mounting bolt 11 on the inner wall of the tunnel 1. The construction of the anchor hole and the mounting hole can be achieved by using an existing drilling machine, which is a mature existing technology and will not be described in detail here.

[0034] S3. Use the anchor rod 3 to fix the first point of the anchor net 2 to the inner wall of the tunnel 1. A disc can be set on the anchor rod 3 to press the first point of the anchor net 2 against the inner wall of the tunnel 1. This is a conventional fixing method and will not be described in detail here.

[0035] S4. Fix the second point on the anchor net 2 to the inner wall of the tunnel 1 using the auxiliary fixer 4. More specifically, the method of fixing the second point on the anchor net 2 to the inner wall of the tunnel 1 using the auxiliary fixer 4 includes S41 to S43.

[0036] S41 , installing the mounting bolts 11 into the mounting holes to fix the mounting plate 6 to the second point.

[0037] S42. Adjust the angle of the connecting rod 8 until the collar 10 can contact the steel wire 5 of the anchor net 2. On the other hand, by rotating the connecting rod 8 to move the connecting rod 8 along its own axial direction, the position of the end of the connecting rod 8 is changed, that is, the position of the collar 10 is changed, ensuring that the collar 10 can be put on the steel wire 5 of the anchor net 2.

[0038] S43, putting the collar 10 on the steel wire 5. Specifically, first, the steel wire 5 is passed through the opening 12 and placed inside the collar 10, and then the collar 10 is rotated so that the opening 12 and the shortest connection line between the steel wire 5 and the inner wall of the tunnel 1 are offset, thereby preventing the steel wire 5 from passing through the opening 12 during the process of being pulled toward the inner wall of the tunnel 1 by the collar 10, causing the collar 10 to separate from the steel wire 5, thereby ensuring that the collar 10 can smoothly pull the steel wire 5 to move.

[0039] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0040] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A coal mine tunnel support anchor net fixing device, characterized in that: The invention comprises a plurality of anchor rods (3) and a plurality of auxiliary fixers (4), wherein the anchor rods (3) are used to fix a plurality of first points on the anchor net to the inner wall of the tunnel (1), and the auxiliary fixers (4) are used to fix a plurality of second points on the anchor net (2) to the inner wall of the tunnel (1), and the first points and the second points are staggered, and the auxiliary fixers (4) comprise at least one mounting plate (6), and the mounting plate (6) is fixed to the inner wall of the tunnel (1) by mounting bolts (11), and the mounting plate (6) is rotatably connected to a plurality of connecting rods (8) with different directions, and the connecting rods (8) are movably connected to a collar (10), and the collar (10) can be sleeved on the steel wire (5) of the anchor net (2).

2. A coal mine tunnel support anchor net fixing device according to claim 1, characterized in that: The auxiliary fixer (4) comprises two mounting plates (6), the two mounting plates (6) are parallel to each other, and a distance is left between the two mounting plates (6) to form an accommodating space (14), the mounting bolt (11) passes through the two mounting plates (6) in sequence, a rotating sleeve (15) is provided in the middle of the mounting bolt (11), and the rotating sleeve (15) is located in the accommodating space (14), and a plurality of connecting rods (8) are evenly distributed on the circumference of the rotating sleeve (15) and connected to the rotating sleeve (15).

3. A coal mine tunnel support anchor net fixing device according to claim 2, characterized in that: A plurality of screw rods (7) uniformly distributed along the circumferential direction are fixedly connected to the outer side wall of the rotating sleeve (15), and the screw rods (7) extend radially along the rotating sleeve (15). The connecting rod (8) is provided with screw holes extending along the length direction, and the screw rods (7) are correspondingly inserted into the screw holes.

4. A coal mine tunnel support anchor net fixing device as claimed in claim 3, characterized in that: The fixed sleeve on the peripheral side wall of the rotating sleeve (15) is provided with two connecting rings (21), and a distance is left between the two connecting rings (21). The connecting ring (21) is coaxially fixedly connected to the limiting ring (20), and the two limiting rings (20) are arranged facing each other, and a distance is left between the two limiting rings (20) to form a channel. A distance is left between the limiting ring (20) and the rotating sleeve (15) to form an active space (18). After the screw (7) passes through the channel, it is fixedly connected to a rotating block (19). The rotating block (19) can slide in the active space (18) to rotate around the rotating sleeve (15).

5. A coal mine tunnel support anchor net fixing device as claimed in claim 4, characterized in that: A plurality of isolation blocks (17) are fixedly arranged in the activity space (18), and the plurality of isolation blocks (17) separate the activity space (18) into a plurality of activity areas, and the rotating blocks (19) are correspondingly arranged in the activity areas.

6. A coal mine tunnel support anchor net fixing device as claimed in claim 3, characterized in that: The two mounting plates (6) are fixedly connected via a plurality of support columns (13), and the screw rod (7) passes between two adjacent support columns (13).

7. A coal mine tunnel support anchor net fixing device according to claim 2, characterized in that: One end of the connecting rod (8) away from the rotating sleeve (15) is fixedly connected to the collar (10) via a connecting line (9), and the collar (10) is provided with an opening (12) for the steel wire (5) to pass through.

8. A coal mine tunnel support anchor net fixing device according to claim 1, characterized in that: The mounting bolt (11) is configured as an expansion bolt, and a mounting hole matching the mounting bolt (11) is provided on the inner wall of the tunnel (1).

9. A method for fixing a coal mine tunnel support anchor net, characterized in that: Based on a coal mine tunnel support anchor net fixing device according to any one of claims 1 to 8, the method comprises the following steps: Determining the support position of the anchor net (2) based on the support requirements of the roadway (1), and determining the first point position and the second point position based on the support position of the anchor net (2); Drilling anchor holes for installing anchor rods (3) and mounting holes for installing mounting bolts (11) on the inner wall of the tunnel (1); Using anchor rods (3) to fix the first point on the anchor net (2) to the inner wall of the tunnel (1); The auxiliary fixer (4) is used to fix the second point on the anchor net (2) to the inner wall of the tunnel (1).

10. A method for fixing a coal mine tunnel support anchor net according to claim 9, characterized in that: The method of fixing the second point on the anchor net (2) to the inner wall of the tunnel (1) using the auxiliary fixer (4) comprises: Installing the mounting bolt (11) into the mounting hole to fix the mounting plate (6) to the second point; Adjusting the angle of the connecting rod (8) until the collar (10) can contact the steel wire (5) of the anchor net (2); The ferrule (10) is sleeved on the steel wire (5).

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