Tunneling machine mesh laying device, tunneling machine and combined support method

Abstract

This invention belongs to the field of tunnel support technology, specifically disclosing a mesh laying device for a tunnel boring machine (TBM), a TBM, and a combined support method. The combined support method involves arranging a mesh laying arm at the front of the TBM's anchor drilling system. The mesh laying arm extends and retracts to hang the mesh, pulling the mesh sheet located on one side of the tunnel to the other side. The mesh laying arm and the mesh sheet automatically separate, completing the laying. Subsequently, the anchor drilling system moves forward to the area covered by the mesh sheet to perform anchor bolt support operations. This combined support method can automatically realize mesh laying and anchor bolt support, solving the problems of low mesh laying efficiency and insufficient safety. The TBM mesh laying device includes a mesh laying arm and a rotating mechanism. The mesh laying arm can extend and retract to hang the mesh and rotates under the action of the rotating mechanism, driving the mesh sheet to unfold and lay, resulting in a high degree of automation and good safety. The TBM includes the aforementioned mesh laying device and anchor drilling system, and can be used to implement the above-mentioned combined support method.

Description

Technical Field

[0001] This invention belongs to the field of tunnel support technology, and in particular relates to a tunneling machine mesh laying device, a tunneling machine, and a combined support method. Background Technology

[0002] Tunnel support is a crucial step in the construction of full-face tunnel boring machines (TBMs). In the field of coal mine roadway excavation, anchor mesh support is a commonly used support method. Anchor mesh support is a support system consisting of metal mesh fixed or tied to anchor bolts using support plates.

[0003] Currently, the installation of metal mesh is mainly carried out manually in conjunction with metal mesh installers. The environment inside the tunnel is extremely harsh, with a high risk of falling rocks at the support locations, posing a significant safety hazard to workers. Furthermore, the efficiency of mesh installation is low due to the physical limitations of the workers.

[0004] In recent years, research has begun on improving mesh laying efficiency by equipping tunneling machines with rapid mesh laying devices. Chinese invention patent application CN113530574A (publication date: October 22, 2021) discloses a rapid support device for TBM rebar mesh. This device is equipped with a double winch and a mesh support arm, and can travel along the axial direction of the TBM main beam. The winches can automatically rotate and unfold the rebar mesh, improving operational efficiency to some extent. However, this device still requires manual processes such as hooking, unhooking, and soil nailing to fix the mesh, resulting in a low degree of automation and significant safety hazards during manual operation.

[0005] Therefore, there is a need to provide a high-efficiency and safe tunneling machine mesh laying device. Summary of the Invention

[0006] The purpose of this invention is to provide a mesh laying device for a tunneling machine to solve the technical problems of low efficiency and insufficient safety in existing mesh laying operations. Another purpose of this invention is to provide a tunneling machine and a combined support method to solve the technical problems of low efficiency and insufficient safety in existing anchor mesh support operations.

[0007] To achieve the above objectives, the technical solution of the combined support method provided by this invention is as follows:

[0008] The combined support method involves placing rolled-up mesh on one side of the tunnel. A telescopic mesh-laying arm, which can rotate around the tunnel's central axis, is positioned in front of the tunnel boring machine's anchor drilling system. The mesh-laying arm interlocks with the mesh grid and rotates from one side to the other, pulling the mesh out. The mesh-laying arm then separates from the mesh, completing the mesh laying and providing temporary support. Subsequently, the anchor drilling system moves forward to the mesh coverage area to perform anchor bolt support operations. The forward stroke of the anchor drilling system is adjusted according to the mesh ring width and support requirements to complete the combined support operation.

[0009] The beneficial effects are as follows: This method overcomes the shortcomings of traditional manual net laying and fixing, which are characterized by low efficiency and insufficient safety. By equipping the tunneling machine with a net-laying arm, which extends and retracts to insert and hang the net, and then lays the net through its rotational movement, this method achieves automated net laying. After the net is laid, the rear anchor drilling system automatically moves forward to provide anchor support, completing the anchor-net support. This method, through the combined operation of the net-laying arm and the anchor drilling system, achieves automated and unmanned anchor-net support operations, improving both operational efficiency and safety.

[0010] To achieve the above objectives, the technical solution of the tunneling machine mesh laying device provided by the present invention is as follows:

[0011] A mesh laying device for a tunneling machine includes a frame, the frame being equipped with a slewing mechanism whose axis extends in the front-to-back direction, and a mesh laying arm connected to a rotating body in the slewing mechanism. The mesh laying arm is radially extendable and retractable along the slewing mechanism, and the extendable end is equipped with a mesh plug.

[0012] The beneficial effects are: This mesh-laying device improves upon the problem of existing mesh-laying devices requiring manual assistance during mesh hanging. This device automatically extends and hooks the mesh sheet via a mesh-laying arm plug, and a rotating mechanism drives the mesh-laying arm to rotate, achieving circumferential mesh-laying operations in the tunnel. After laying, the mesh sheet plug automatically retracts. This mesh-laying device achieves unmanned and automated mesh-laying operations, improving work efficiency and enhancing safety.

[0013] As a further improvement, the slewing mechanism includes a slewing frame, the net-laying arm is fixedly connected to the slewing frame, the slewing frame is provided with rolling elements, the frame is provided with an arc-shaped track for rolling cooperation with the rolling elements, and the slewing frame is also provided with a slewing drive device.

[0014] The beneficial effects are: this net laying device achieves rotary motion through the rolling cooperation between the rotary frame and the machine frame, which has a simple structure, good connection reliability, and more stable motion process.

[0015] As a further improvement, the rotary drive device includes a rotary power device, the power output end of which is connected to a gear, and the frame is provided with an arc-shaped rack for meshing and transmission with the gear, the arc-shaped rack being coaxial with the arc-shaped track.

[0016] The beneficial effects are: by setting up a gear and rack mechanism, this net-laying device improves transmission accuracy and stability.

[0017] As a further improvement, the net-laying arm includes a telescopic cylinder and a sleeve rod, with one end of the telescopic cylinder connected to the fixed end of the sleeve rod and the other end connected to the telescopic end of the sleeve rod.

[0018] As a further improvement, the frame is also provided with a net-supporting mechanism, which is located on one side of the axial direction of the net-laying arm. The net-supporting mechanism includes a net-supporting arm, which can extend and retract radially along the rotary mechanism.

[0019] As a further improvement, the telescopic end of the support arm is provided with an arc-shaped support surface.

[0020] The beneficial effects are: improved stability of the support net and better fit between the netting and the tunnel wall.

[0021] As a further improvement, the frame is provided with a mesh box, the mesh box includes a rotating shaft, the rotating shaft is detachably rotatably connected to the frame, and the axis of the rotating shaft extends in the front-rear direction.

[0022] The beneficial effect is that the mesh rotates around the axis while being unfolded, which improves the stability during unfolding and reduces the risk of the mesh getting stuck.

[0023] As a further improvement, the frame is also provided with a longitudinal movement mechanism for connecting the tunneling machine, the longitudinal movement mechanism including traveling wheels that are rotatably connected to the frame.

[0024] To achieve the above objectives, the technical solution for the tunneling machine provided by this invention is as follows:

[0025] A tunneling machine includes an anchor drilling system. A mesh laying device is located at the front of the anchor drilling system. The mesh laying device includes a frame with a slewing mechanism whose axis extends in the front-rear direction. It also includes a mesh laying arm connected to a rotating body in the slewing mechanism. The mesh laying arm is radially extendable along the slewing mechanism, and its extendable end is equipped with a mesh plug.

[0026] The beneficial effects are: This mesh-laying device improves upon the problem of existing mesh-laying devices requiring manual assistance during mesh hanging. This device automatically extends and hooks the mesh sheet via a mesh-laying arm plug, and a rotating mechanism drives the mesh-laying arm to rotate, achieving circumferential mesh-laying operations in the tunnel. After laying, the mesh sheet plug automatically retracts. This mesh-laying device achieves unmanned and automated mesh-laying operations, improving work efficiency and enhancing safety.

[0027] As a further improvement, the slewing mechanism includes a slewing frame, the net-laying arm is fixedly connected to the slewing frame, the slewing frame is provided with rolling elements, the frame is provided with an arc-shaped track for rolling cooperation with the rolling elements, and the slewing frame is also provided with a slewing drive device.

[0028] The beneficial effects are: this net laying device achieves rotary motion through the rolling cooperation between the rotary frame and the machine frame, which has a simple structure, good connection reliability, and more stable motion process.

[0029] As a further improvement, the rotary drive device includes a rotary power device, the power output end of which is connected to a gear, and the frame is provided with an arc-shaped rack for meshing and transmission with the gear, the arc-shaped rack being coaxial with the arc-shaped track.

[0030] The beneficial effects are: by setting up a gear and rack mechanism, this net-laying device improves transmission accuracy and stability.

[0031] As a further improvement, the net-laying arm includes a telescopic cylinder and a sleeve rod, with one end of the telescopic cylinder connected to the fixed end of the sleeve rod and the other end connected to the telescopic end of the sleeve rod.

[0032] As a further improvement, the frame is also provided with a net-supporting mechanism, which is located on one side of the axial direction of the net-laying arm. The net-supporting mechanism includes a net-supporting arm, which can extend and retract radially along the rotary mechanism.

[0033] As a further improvement, the telescopic end of the support arm is provided with an arc-shaped support surface.

[0034] The beneficial effects are: improved stability of the support net and better fit between the netting and the tunnel wall.

[0035] As a further improvement, the frame is provided with a mesh box, the mesh box includes a rotating shaft, the rotating shaft is detachably rotatably connected to the frame, and the axis of the rotating shaft extends in the front-rear direction.

[0036] The beneficial effect is that the mesh rotates around the axis while being unfolded, which improves the stability during unfolding and reduces the risk of the mesh getting stuck.

[0037] As a further improvement, the frame is also provided with a longitudinal movement mechanism for connecting the tunneling machine, the longitudinal movement mechanism including traveling wheels that are rotatably connected to the frame. Attached Figure Description

[0038] Figure 1 This is an isometric view of Embodiment 1 of the tunneling machine mesh laying device in this invention;

[0039] Figure 2 This is a rear view of Embodiment 1 of the tunneling machine mesh laying device in this invention;

[0040] Figure 3 This is a left view of Embodiment 1 of the tunneling machine mesh laying device in this invention;

[0041] Figure 4 for Figure 2 Sectional view along line A;

[0042] Figure 5 for Figure 3 Sectional view along line B;

[0043] Figure 6 for Figure 3 Sectional view along line C;

[0044] Figure 7 This is a schematic diagram illustrating the structure and operation process of the tunneling machine embodiment of the present invention.

[0045] Explanation of reference numerals in the attached figures:

[0046] 1. Tunneling machine mesh laying device; 2. Anchor bolt drilling system; 111. Rotary section frame assembly; 112. Mesh support section frame assembly; 113. Rack; 114. Rail; 115. Support plate; 116. Connecting beam; 121. Rotary frame; 122. Hydraulic motor; 123. Rolling wheel; 124. Coupling flange; 125. Pinion; 131. First telescopic rod; 132. First fixed cylinder; 133. First telescopic cylinder; 134. First support plate; 135. Mesh hanging nail; 141. Second telescopic rod; 142. Second fixed cylinder; 143. Second telescopic cylinder; 144. Second support plate; 151. Traveling wheel box; 152. Traveling wheel; 161. Mesh box frame; 162. Mesh roll; 163. Rotating shaft; 164. End cover. Detailed Implementation

[0047] The present invention will be further described in detail below with reference to the embodiments.

[0048] Specific embodiment 1 of the tunneling machine mesh laying device provided by the present invention:

[0049] like Figures 1-6 As shown, in this embodiment, the tunneling machine mesh laying device 1 includes a frame, a slewing mechanism, a mesh laying arm, a mesh supporting arm, a longitudinal movement mechanism, and a mesh box. The slewing mechanism, the mesh supporting arm, the longitudinal movement mechanism, and the mesh box are all connected to the frame, and the mesh laying arm is connected to the slewing mechanism and rotates with the slewing mechanism.

[0050] The frame includes a rotating section frame assembly 111, which includes a vertically arranged arc-shaped plate. A rotating mechanism is connected to the rotating section frame assembly 111. The rotating mechanism includes a rotating frame 121, which is an arc-shaped plate connected to the rotating section frame assembly 111 via rolling wheels 123. The rotating section frame assembly 111 is provided with a track 114 for the rolling wheels 123 to roll. The track 114 is arc-shaped, and its central axis extends in the front-to-back direction (the front-to-back direction of the tunneling machine). The central axis of the track 114 is the swing axis of the rotating mechanism. Figure 1 , Figure 4 and Figure 5As shown, there are 8 rollers 123 in 4 pairs. Two pairs of rollers 123 are located at the top, each pair including two rollers 123, positioned on the front and rear sides of the rotary frame assembly 111 respectively. Their rolling axes extend radially along the track 114 to prevent the rotary frame 121 from shifting to one side. Two pairs of rollers 123 are located at the bottom, each pair including two rollers 123, positioned on the upper and lower sides of the track 114 respectively. Their rolling axes are parallel to the axis of the track 114, used to realize the rotational movement of the rotary frame 121. Specifically, the rollers 123 can be needle roller bearings. A rotary drive device is also connected between the rotary frame 121 and the rotary section frame assembly 111. The rotary drive device is a drive device that can output rotational power, which can be a hydraulic motor or an electric motor. Specifically, in this embodiment, the rotary drive device is a hydraulic motor 122. The power output end of the hydraulic motor 122 is connected to a pinion 125 through a coupling flange 124. The rotary section frame assembly 111 is provided with a rack 113 for meshing and transmitting power with the pinion 125. The rack 113 is an arc-shaped rack, and its axis is the same as the axis of the track 114. Under the driving action of the hydraulic motor 122, the rotary frame 121 can realize the rotary motion relative to the rotary section frame assembly 111.

[0051] The rotating frame 121 is equipped with a net-laying arm, which is a telescopic sleeve structure that can extend and retract radially along the track 114. Specifically, the net-laying arm includes a first telescopic rod 131 and a first fixed cylinder 132. The first telescopic rod 131 is fitted inside the first fixed cylinder 132, which is fixedly connected to the rotating frame 121. It also includes a first telescopic cylinder 133 for driving the telescopic movement of the first telescopic rod 131. One end of the first telescopic cylinder 133 is connected to the first telescopic rod 131, and the other end is connected to the first fixed cylinder 132. A first support plate 134 is provided at the end of the first telescopic rod 131. A net insert is provided on the first support plate 134. Specifically, the net insert is formed by several net-hanging nails 135, which are used to insert into the mesh in the net to achieve net hanging. The specific structure of the net-hanging nails 135 can be as follows: Figure 3 The cylindrical shape shown can also be an upward-opening arc, or a large-curvature arc with the opening facing the tangential direction when the net-laying arm moves.

[0052] The netting support arm is connected to the netting support frame assembly 112. The netting support frame assembly 112 includes a vertically arranged arc-shaped plate, and a support plate 115 is also provided at its upper end. The support plate 115 is also an arc-shaped plate, which can assist in supporting the netting. Specifically, the netting support arm is a telescopic sleeve structure that can extend and retract radially along the track 114. Specifically, the netting arm includes a second telescopic rod 141 and a second fixed cylinder 142. The second telescopic rod 141 is fitted inside the second fixed cylinder 142, and the second fixed cylinder 142 is fixedly connected to the netting support frame assembly 112. It also includes a second telescopic hydraulic cylinder 143 for driving the extension and retraction of the second telescopic rod 141. One end of the second telescopic hydraulic cylinder 143 is connected to the second telescopic rod 141, and the other end is connected to the second fixed cylinder 142. A second support plate 144 is provided at the end of the second telescopic rod 141 to form a netting support surface, so that the netting fits more tightly with the tunnel wall. Specifically, the second support plate 144 is an arc-shaped plate with the same curvature as the support plate 115.

[0053] The longitudinal movement mechanism includes a traveling wheel box 151 and traveling wheels 152. The traveling wheel box 151 is fixedly connected to the connecting beam 116 in the frame. During manufacturing, the traveling wheel box 151 and the connecting beam 116 can be machined as a single unit; therefore, the traveling wheel box 151 can also be considered part of the connecting beam 116. In use, the traveling wheels 152 are connected to the main beam, connecting bridge, or rear trailer in the tunneling machine to connect the mesh laying device to the tunneling machine. The traveling wheel box 151 is equipped with a longitudinal movement drive device, which can be a hydraulic cylinder or a motor combined with a rack and pinion structure. The longitudinal movement principle is existing technology and will not be elaborated further here.

[0054] The wire mesh box includes a rotating shaft 163, which is rotatably connected to the wire mesh box frame 161. The wire mesh box frame 161 is fixedly connected to the connecting beam 116 in the machine frame. The wire mesh box frame 161 and the connecting beam 116 can be integrally machined. Therefore, the wheel box 151 can also be considered as part of the connecting beam 116. The wire mesh box frame 161 is provided with a detachable end cover 164, which allows for quick disassembly and assembly of the rotating shaft 163. In use, the center of the wire mesh roll 162 is placed on the rotating shaft 163, and then both ends of the rotating shaft 163 are connected to the wire mesh box frame 161. As the wire mesh roll 162 unfolds, it rotates around the rotating shaft 163, which can better maintain the posture of the wire mesh roll 162 and reduce the risk of jamming when unfolding.

[0055] The working principle of the tunnel boring machine mesh laying device in this invention is as follows: The mesh roll 162 is placed on the rotating shaft 163. The rotating frame 121 is adjusted to drive the mesh laying arm to one side of the mesh roll 162. The first telescopic rod 131 extends out, and the mesh hanging nail 135 is inserted into the mesh grid. The mesh is hung on the mesh hanging nail. Then, the rotating frame 121 is adjusted to drive the mesh laying arm to the other side, and the mesh roll is pulled out. The support plate 115 temporarily supports the mesh. Then, the second telescopic rod 141 in the support arm extends out, supports the mesh, and presses it against the tunnel wall to complete the mesh laying operation.

[0056] The specific embodiment 2 of the tunneling machine mesh laying device provided by the present invention differs from embodiment 1 mainly in that: in embodiment 1, the slewing mechanism includes a slewing frame 121, which rotates relative to the slewing part frame assembly 111. In this embodiment, the slewing mechanism is a slewing bearing structure with meshing teeth on the inner ring. The mesh laying arm is connected to the inner ring through a flange and rotates with the inner ring. In use, the slewing mechanism can be arranged on the main beam of the tunneling machine.

[0057] The specific embodiment 3 of the tunneling machine mesh laying device provided by the present invention differs from embodiment 1 mainly in that: in embodiment 1, the slewing drive device is a hydraulic motor 122. In this embodiment, the slewing drive device is a swing cylinder provided on both sides of the slewing part frame assembly, with one end of the swing cylinder hinged to the slewing frame and the other end hinged to the slewing part frame assembly.

[0058] The specific embodiment 4 of the tunneling machine mesh laying device provided by the present invention differs from embodiment 1 mainly in that: in embodiment 1, the mesh laying arm includes a telescopic sleeve and a first telescopic hydraulic cylinder 133. In this embodiment, the mesh laying arm is formed by the first telescopic hydraulic cylinder.

[0059] The specific embodiment 5 of the tunneling machine mesh laying device provided by the present invention differs from embodiment 1 mainly in that: in embodiment 1, the mesh supporting arm is provided with a second supporting plate 144, and the second supporting plate 144 forms an arc-shaped mesh supporting surface. In this embodiment, the mesh supporting arm is not provided with a second supporting plate.

[0060] The specific embodiment 6 of the tunneling machine mesh laying device provided by the present invention differs from embodiment 1 mainly in that: in embodiment 1, the mesh box includes a rotating shaft 163. In this embodiment, the mesh box is simply a box body with a door on one side.

[0061] The specific embodiment 7 of the tunneling machine mesh laying device provided by the present invention differs from embodiment 1 mainly in that: in embodiment 1, the frame includes a rotating part frame assembly 111 and a mesh supporting part frame assembly 112. In this embodiment, only the rotating part frame assembly is included, and the mesh supporting arm is located at the other end opposite to the rotating arm.

[0062] Specific embodiments of the tunneling machine in this invention:

[0063] like Figure 7 As shown, the tunneling machine includes a bolt drilling system 2. A tunneling machine mesh laying device 1, as described in any of the embodiments 1-7 of the tunneling machine mesh laying device described above, is provided on the front side of the bolt drilling system. It will not be described in detail here.

[0064] Specific embodiments of the combined support method in this invention:

[0065] The combined support method involves placing rolled-up wire mesh on one side of the tunnel. A retractable wire mesh-hanging arm, capable of rotating around the tunnel's central axis, is positioned in front of the tunnel boring machine's anchor drilling system. The arm interlocks with the wire mesh and rotates from one side to the other, pulling the mesh out. The arm then separates from the mesh, providing temporary support. The anchor drilling system then moves forward to the mesh coverage area to perform anchor bolt support. The forward stroke of the anchor drilling system is adjusted according to the mesh ring width and support requirements to complete the combined support operation. This combined support method can be implemented using the aforementioned tunnel boring machine embodiment. The following section will discuss further details. Figure 5 and Figure 7 The specific steps of the operation will be explained in detail:

[0066] First, we define the following:

[0067] Initial position of the rotating frame: one side of the wire mesh box. Figure 5 The three o'clock direction;

[0068] The rotating frame terminates on the side opposite to the wire mesh box. Figure 5 The direction of the nine o'clock position;

[0069] Initial state of the netting arm: First telescopic rod 131 retracted;

[0070] Net support arm termination state: Second telescopic rod 141 retracted state;

[0071] Step 1: Mount the pre-rolled wire mesh roll 162 onto the rotating shaft 163, and then connect the rotating shaft 163 to the wire mesh box frame 161;

[0072] Step 2: Rotary frame 121 returns to its initial position, and the netting arm returns to its initial state;

[0073] Step 3: Extend the first telescopic rod 131 in the netting arm until it is extended to the position where the hanging nail 135 can be inserted into the mesh of the net roll 162, and hang the net roll 162 on the hanging nail 135;

[0074] Step 4: The rotating frame 121 returns to the end position, at which point the wire mesh roll 162 unfolds and covers the pallet 115;

[0075] Step 5: The net-laying arm returns to its initial state, and the rotating frame 121 moves to approximately... Figure 5At the 12 o'clock position, the first telescopic rod 131 of the netting arm extends until the netting nail 135 is attached to the tunnel wall;

[0076] Step 6: The second telescopic rod 141 in the support arm extends counterclockwise in sequence to press the mesh tightly against the tunnel wall, and the mesh arm returns to its initial state;

[0077] Step 7: Move the anchor drilling system 2 forward to the mesh coverage area and perform anchor bolt support;

[0078] Step 8: The second telescopic rod 141 in the net support arm is retracted a certain distance to ensure that the net laying device can move forward while the net sheet will not fall off. The net laying device moves forward a distance D.

[0079] Step 9: Move the anchor drilling system 2 forward a distance D, and perform anchor support again until the single-ring wide mesh is anchored;

[0080] Repeat steps 1-9 to complete the tunnel anchor mesh support operation.

[0081] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still make modifications to the technical solutions described in the foregoing embodiments without creative effort, or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A web laying device for a roadheader, comprising a frame, characterized in that The rack is provided with a rotating mechanism, the axis of the rotating mechanism extends in the front-rear direction, and further comprises a net laying arm, a net supporting arm and a longitudinal moving mechanism.

2. A heading machine web laying device according to claim 1, characterized in that, The net laying arm comprises a telescopic oil cylinder and a sleeve rod, one end of the telescopic oil cylinder is connected with the fixed end of the sleeve rod, and the other end is connected with the telescopic end of the sleeve rod.

3. A heading machine web laying device according to claim 1, characterized in that, The telescopic end of the net supporting arm is provided with an arc-shaped net supporting surface.

4. The heading machine web-laying device of claim 1, wherein, The rack is provided with a net box, the rotating shaft is detachably connected with the rack in a rotating manner, and the axis of the rotating shaft extends in the front-rear direction.

5. A roadheader comprising a bolting system, characterized in that The front side of the anchor rod drilling machine system is provided with the tunneling machine net laying device as claimed in any one of claims 1-4.

6. A combined support method using the net laying device of any one of claims 1 to 4, characterized by, The net is placed on one side of the tunnel, the net laying device comprises a telescopic net hanging arm and a telescopic net supporting arm, the net laying arm is extended to be inserted into the net grid and is rotated from one side of the net to the other side, the net is pulled to be unfolded, then the net laying arm is retracted to be separated from the net and is moved to the center position, the net laying arm is again extended to lift the net to be attached to the tunnel wall, the net supporting arm is extended to press the net to be attached to the tunnel wall, then the anchor rod drilling machine system is moved forward to the rear end of the net covering range to perform the anchor rod supporting operation, then the net supporting arm is retracted by a certain distance, the net laying device is moved forward by a distance D, the anchor rod drilling machine system is moved forward by a distance D, the anchor rod supporting is performed again, and the single-ring wide net anchoring is completed.

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