Automatic net laying device and method for open type TBM rock burst flexible protection net

Abstract

The application discloses an automatic net laying device and method for open TBM rock burst flexible protection net. The flexible protection net storage compartment of the application is located between the top shield of the TBM and the steel bar row storage compartment, and a plurality of positioning grooves are arranged inside along the arc direction of the top shield; the positioning steel bars are arranged in each positioning groove and used for being connected with the flexible protection net; the flexible protection net flattening assembly is arranged on the top of the flexible protection net storage compartment and used for providing downward pressure to the flexible protection net, so that the flexible protection net is flattened and adheres to the positioning steel bars; the automatic storage and release device is arranged at the insertion opening of the positioning groove, and the automatic storage and release device adopts a crawler belt conveying mode to move the positioning steel bars from the insertion end of the positioning groove to the direction of the TBM shield head, so as to automatically store the flexible protection net; the application realizes full automation from storage to laying and simultaneously lays the steel bar row and the flexible protection net, thereby obviously improving the construction efficiency, and the positioning steel bars improve the flatness during the laying of the flexible net.

Description

Technical Field

[0001] This invention relates to the field of netting equipment technology, specifically to an automatic netting device and method for open-type TBM rockburst flexible protective netting. Background Technology

[0002] During the construction of railway tunnels, the stability of tunnel excavation is affected by complex geological environments. Among these, under high ground stress conditions, the dynamic instability induced by brittle hard rock after excavation unloading—known as rockburst—seriously affects the safe construction of tunnels, posing significant risks to life and property. To ensure tunnel excavation stability, rock burst prevention has become the most direct and effective measure after underground cavern excavation, and has received increasing attention. Most research is based on the anchor-net-shotcrete (anchor-net-shotcrete) support system, continuously improving its rockburst prevention performance. Currently, in open-face TBM construction, steel reinforcement bars are mainly used to seal and reinforce the fractured surrounding rock. This measure allows for seamless connection between excavation and support, and the steel reinforcement bars can control the collapse and ejection of fractured rock to a certain extent, providing sufficient time and a safe working environment for subsequent support operations.

[0003] Flexible protective netting, as an emerging polymer material, is made from polymer filament fibers and advanced coating technology. It possesses high strength and toughness, acting as a flexible buffer and energy release mechanism in rockburst protection, making it highly beneficial for preventing rockburst disasters in tunnels. While flexible protective netting offers these advantages, the equipment and processes for its coordinated construction with other support structures in tunnels require further investigation to achieve safe, efficient, and economical results.

[0004] In open-face TBM construction, steel reinforcement bars are typically inserted into storage compartments inside the TBM's arched shield. One end of the reinforcement bar is secured with an arch frame and anchor bolts, while the other end moves freely along the tunnel axis within the shield's interlayer structure. This supports and controls the collapse of loose rock. When the circumferential spacing of the reinforcement bars is large, some rocks ejected by rockbursts will fall through the gaps, failing to provide effective support and protection. When the circumferential spacing is small, it can effectively protect against smaller rocks, but this results in excessive steel consumption, significant waste of raw materials, and extended construction time. Therefore, it is necessary to combine steel reinforcement bars with flexible protective netting to form a collaborative rockburst protection system for open-face TBMs.

[0005] Existing open-type TBM equipment cannot automatically lay flexible protective netting and rebar along the tunnel axis as the TBM advances during construction. Therefore, it cannot effectively achieve seamless operation between tunneling and netting laying, which leads to low efficiency in netting laying and difficulty in forming a coordinated protective system with the rebar.

[0006] In conclusion, it is necessary to develop an automated net-laying device and method for flexible rockburst protection nets in open-type TBMs, so as to realize the automatic laying of flexible protection nets during open-type TBM construction, improve the efficiency of net-laying operations and the level of rockburst collaborative protection. Summary of the Invention

[0007] The purpose of this invention is to overcome the problems in the prior art and provide an automatic net laying device and method for flexible protective nets for open TBM rockburst tunnels, which solves the problems of difficulty in laying flexible protective nets in TBM rockburst tunnels and difficulty in forming an integrated protective system with steel reinforcement.

[0008] The present invention provides an automatic net laying device for a flexible protective net for an open TBM rockburst, comprising a top shield of the TBM, a steel bar storage compartment provided inside the top shield, and a flexible protective net storage compartment located between the top shield of the TBM and the steel bar storage compartment, wherein multiple positioning slots are arranged inside the flexible protective net storage compartment along the arc of the top shield.

[0009] Positioning reinforcing bars are installed along the length of the tunnel to guide the flexible protective net into and out of the flexible protective net storage compartment. The positioning groove is used to accommodate the positioning reinforcing bars when they follow the flexible protective net into and out of the flexible protective net storage compartment.

[0010] An automatic retraction and release device is provided at the insertion end of the positioning slot. The automatic retraction and release device uses a crawler conveyor to allow the positioning steel bar to enter or move out of the positioning slot, thereby automatically retracting or releasing the flexible protective net.

[0011] As a preferred embodiment, the top of the flexible protective net storage compartment is further provided with a flexible protective net leveling component. The flexible protective net leveling component includes a pulley assembly arranged along the length of the top shield. The pulley assembly includes:

[0012] A pulley fixing plate is fixed to the top of the flexible protective net storage compartment;

[0013] Multiple retractable pulleys are fixed vertically to the pulley fixing plate, and the bottom of the retractable pulleys abuts against the flexible protective net.

[0014] As another preferred embodiment, the pulley fixing plate is also provided with buffer pulleys at both ends along the length of the top shield, and multiple retractable pulleys are located between two buffer pulleys. The distance between the bottom of the buffer pulley and the flexible protective net is greater than the distance between the bottom of the multiple retractable pulleys and the flexible protective net.

[0015] As another preferred embodiment, the automatic take-up and take-down device includes:

[0016] A height-adjustable support is provided at the insertion end of the positioning groove;

[0017] A track conveyor assembly is mounted on the support member, and the height of the support member is adjusted so that the track conveyor assembly can fit into the positioning steel bar in the positioning groove.

[0018] As another preferred embodiment, the track conveyor assembly is driven by a motor, which is connected to a motor control box for regulating the speed or torque of the motor.

[0019] As another preferred embodiment, the length of the positioning steel bar is equal to the length of the steel bar inserted into the steel bar storage compartment.

[0020] As another preferred embodiment, the width of the positioning groove is greater than the diameter of the positioning reinforcing bar.

[0021] As another preferred embodiment, the coverage of the flexible protective netting compartment along the width of the arch is at least 120° or more over the width of the arch area.

[0022] This invention also discloses a construction method for an automatic net-laying device using the above-mentioned open-type TBM rockburst flexible protective net, comprising the following steps:

[0023] First, store the flexible protective net in the flexible protective net storage compartment, and then store the steel bar stack in the steel bar storage compartment.

[0024] As the TBM head advances, flexible protective netting, positioning steel bars, and steel bar rows are applied to the free face of the surrounding rock. The exposed ends of the steel bar rows and flexible protective netting are fixed at fixed intervals along the tunnel length. During the TBM excavation process, the steel bar rows gradually cover the free face of the surrounding rock, and the flexible protective netting moves synchronously with the positioning steel bars and steel bar rows, with the flexible protective netting located between the steel bar rows and the free face of the surrounding rock.

[0025] As the TBM advances, a steel arch frame is constructed behind it according to the design standards to complete the coordinated protection operation of the steel arch frame supporting the steel reinforcement bar and fixing the flexible protective net to the steel reinforcement bar;

[0026] Low-prestressed anchor bolts are installed in the intervals between steel arch frames. The steel bar strips and flexible protective nets play a role in protecting the surrounding rock, while the anchor bolts and steel arch frames provide support and reinforcement, forming an integrated and collaborative protection system.

[0027] Compared with the prior art, the beneficial effects of the present invention are:

[0028] This invention proposes a net-laying device for flexible protective netting in open-type TBM rockburst protection systems. The device utilizes a flexible protective netting storage compartment positioned above a rebar storage compartment to allow for parallel, synchronized laying of the rebar and flexible protective netting. Furthermore, the invention employs positioning rebars to ensure flatness during the storage and release of the flexible protective netting, enhancing the laying effect while achieving synchronized laying of the netting and rebar. In addition, this invention includes an automatic storage and release device, enabling fully automated operation of the entire process from storage to netting laying. Attached Figure Description

[0029] Figure 1 This is a front view of the open-type TBM flexible protective netting automated net laying device according to an embodiment of the present invention.

[0030] Figure 2 This is a cross-sectional view of the open-type TBM flexible protective netting automated net laying device according to an embodiment of the present invention.

[0031] Figure 3 This is a partial detailed view of the pulley assembly according to an embodiment of the present invention.

[0032] Figure 4 This is a partial detailed view of the automatic take-up and take-down device according to an embodiment of the present invention.

[0033] Explanation of reference numerals in the attached figures:

[0034] 1. Top shield; 2. Flexible protective net storage compartment; 3. Flexible protective net; 4. Pulley assembly; 41. Pulley fixing plate; 42. Telescopic pulley; 43. Buffer pulley; 44. Hydraulic rod; 45. Pulley base; 46. Rotating shaft; 47. Rigid rod; 5. Positioning steel bar; 6. Binding component; 7. Positioning groove; 8. Automatic take-up and take-down device; 81. Support component; 82. Tracked conveyor assembly; 821. Conveyor track; 822. Driving roller; 823. Driven roller; 824. Connecting component; 811. Support component fixed end; 812. Support component moving end; 83. Motor; 84. Motor control box; 85. Mounting plate; 9. Steel bar storage compartment; 10. Steel bar. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this disclosure. All other embodiments obtained by those skilled in the art based on the described embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0036] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms “first,” “second,” and similar terms used in this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as “comprising” or “including” mean that the elements or objects preceding “comprising” or “including” encompass the elements or objects listed following “comprising” or “including” and their equivalents, and do not exclude other elements or objects. Terms such as “connected” or “linked” are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as “upper,” “lower,” “left,” and “right” are used only to indicate relative positional relationships; when the absolute position of the described objects changes, the relative positional relationship may also change accordingly.

[0037] like Figure 1 As shown in the figure, this embodiment discloses an automatic net laying device for open-type TBM rockburst flexible protective net, including a flexible protective net storage compartment 2. The flexible protective net storage compartment 2 is located between the top shield 1 and the steel bar storage compartment 9, and multiple positioning grooves 7 are arranged inside it along the arc of the top shield 1.

[0038] The positioning reinforcing bar 5 is installed along the length of the tunnel, i.e., along the length of the reinforcing bar row 10, to guide the flexible protective net 3 in and out of the flexible protective net storage compartment 2. The positioning groove 7 is used to accommodate the positioning reinforcing bar 5 when it follows the flexible protective net 3 in and out of the flexible protective net storage compartment 2. The positioning reinforcing bar 5 and the reinforcing bar row 10 are located on the same side of the flexible protective net 3. As an example, the connection between the positioning reinforcing bar 5 and the flexible protective net 3 can be achieved by binding or by using a clamping structure such as a buckle. The positioning reinforcing bar 5 can improve the flatness of the flexible protective net 3 during the laying process. As a preferred embodiment, please refer again. Figure 1 In this embodiment, the steel bar storage compartment 9 can be designed with clearance space for the positioning groove 7 so that the positioning groove 7 and the steel bar storage compartment 9 are arranged at an arc distance. This not only reduces the height of the mesh laying device in the vertical direction, but also facilitates the construction of the steel arch frame later.

[0039] An automatic retraction device 8 is located at the insertion end of the positioning groove 7. The automatic retraction device 8 uses a conveyor belt to move the positioning steel bar 5 into or out of the positioning groove 7, thereby automatically retracting or releasing the flexible protective net 3. In this embodiment, the flexible protective net 3 is bound and fixed to the positioning steel bar 5.

[0040] In this embodiment, before laying the netting, the reinforcing bar 10 is first stored in the reinforcing bar storage compartment 9. Because the flexible protective netting 3 has low hardness, it is prone to slippage or jamming when placed in the flexible protective netting storage compartment 2 due to improper operation or other factors. Therefore, in this embodiment, the flexible protective netting 3 is first fixed to the positioning reinforcing bar 5 at a fixed interval along its length. This embodiment uses a binding method for fixing. Then, the flexible protective netting 3 is stored in the flexible protective netting storage compartment 2 by the automatic deployment and retraction device 8, while the positioning reinforcing bar 5 enters the positioning groove 7. During the laying and storage of the flexible protective netting 3, the flexible protective netting leveling component applies a downward clamping force to the flexible protective netting 3 so that it can fit against the positioning reinforcing bar 5. During the laying process, the reinforcing bar 10, the flexible protective netting 3, and the positioning reinforcing bar 5 are output synchronously, and the exposed ends of the reinforcing bar 10 and the flexible protective netting 3 are fixed at a fixed interval along the longitudinal direction of the tunnel. After the steel arch frame and anchor bolt construction are completed, a collaborative protection system is formed.

[0041] In a preferred embodiment, the top of the flexible protective net storage compartment 2 is further provided with a flexible protective net flattening component, which provides downward pressure to the flexible protective net 3 to make it flat and fit against the positioning steel bar 5; this further improves the flatness of the flexible protective net 3 by ensuring it fits flat against the positioning steel bar 5. In this embodiment, the flexible protective net flattening component includes a pulley assembly 4 arranged along the length of the top shield 1, which is the tunnel length direction. The pulley assembly 4 includes a pulley fixing plate 41, which is fixed to the top of the flexible protective net storage compartment 2; multiple retractable pulleys 42 are fixed vertically to the pulley fixing plate 41, and the bottom of the retractable pulleys 42 abuts against the flexible protective net 3. The specific structure of the retractable pulley 42 is that the pulley is fixed at one end of the rod with telescopic function so that the retractable pulley 42 can make adaptive height adjustment according to the flatness of the contact surface. Multiple retractable pulleys 42 are arranged along the length direction of the positioning steel bar 5, so as to press the flexible protective net 3 in the length direction of the positioning steel bar 5 at multiple points, so that the flexible protective net 3 is flat and attached to the positioning steel bar 5.

[0042] As another preferred embodiment, such as Figure 2 and Figure 3 As shown, the pulley fixing plate 41 is also provided with buffer pulleys 43 at both ends along the length of the top shield 1. Multiple retractable pulleys 42 are located between two buffer pulleys 43. The distance between the bottom of the buffer pulley 43 and the flexible protective net 3 is greater than the distance between the bottom of the multiple retractable pulleys 42 and the flexible protective net 3. The buffer pulleys 43 are designed to facilitate the placement of the flexible protective net 3.

[0043] As a preferred embodiment, such as Figure 4 As shown, the automatic deployment and retraction device 8 of this embodiment includes a height-adjustable support member 81, disposed at the insertion end of the positioning groove 7; the track conveying assembly 82 is disposed on the support member 81, and the height of the support member 81 is adjusted so that the track conveying assembly 82 can fit against the positioning steel bar 5 in the positioning groove 7. In a more preferred embodiment, the track conveying assembly 82 is driven by a motor 83, which is connected to a motor control box 84. The motor control box 84 is used to regulate the speed or torque of the motor 83. The speed of the track conveying assembly 82 is adjusted by regulating the speed or torque of the motor 83.

[0044] In a preferred embodiment, the length of the positioning steel bar 5 is equal to the length of the steel bar 10 inserted into the steel bar storage compartment 9.

[0045] In a preferred embodiment, the width of the positioning groove 7 is greater than the diameter of the positioning steel bar 5, so that the positioning steel bar 5 can be accommodated in the positioning groove 7.

[0046] In a preferred embodiment, the coverage of the flexible protective net storage compartment 2 along the width direction of the arch is at least 120° or more over the width region of the arch.

[0047] This embodiment also discloses a construction method for using the above-mentioned open-type TBM rockburst flexible protection net automatic net laying device, including the following steps:

[0048] First, store the flexible protective net 3 in the flexible protective net storage compartment 2, and then store the steel bar 10 in the steel bar storage compartment 9.

[0049] As the TBM head advances, the flexible protective net 3, positioning steel bars 5, and steel bar strip 10 are applied to the free surface of the surrounding rock. The exposed ends of the steel bar strip 10 and the flexible protective net 3 are fixed at fixed intervals in the longitudinal direction of the tunnel. During the TBM excavation process, the steel bar strip 10 gradually covers the free surface of the surrounding rock. The flexible protective net 3 moves synchronously with the positioning steel bars 5 and the steel bar strip 10, and the flexible protective net 3 is located between the steel bar strip 10 and the free surface of the surrounding rock.

[0050] As the TBM shield advances, a steel arch frame is constructed behind it according to the design standards to complete the coordinated protection operation of the steel arch frame supporting the steel reinforcement row 10 and fixing the flexible protective net 3 to the steel reinforcement row 10.

[0051] Low-prestressed anchor bolts are installed in the intervals between steel arch frames. The steel bar row 10 and the flexible protective net 3 play the role of surrounding rock protection, while the anchor bolts and steel arch frames play the role of support and reinforcement, forming an integrated and collaborative protection system.

[0052] The following will describe in more detail the construction method using the construction device of this embodiment, following the complete construction process.

[0053] 1. Preparation stage

[0054] The original TBM top shield 1 has a steel bar storage compartment 9 inside. A flexible protective net storage compartment 2 is added to the inside of the top shield 1 and the outside of the steel bar storage compartment 9. The flexible protective net storage compartment 2 covers a 120° area of ​​the arch, which makes it easy to store the flexible protective net 3 before the TBM tunnels.

[0055] Because the flexible protective net 3 has low rigidity, it is prone to slippage and jamming when placed into the flexible protective net storage compartment 2 due to improper operation or other factors. Therefore, positioning steel bars 5 are arranged at certain intervals along the arc of the flexible protective net 3. The flexible protective net 3 and the positioning steel bars 5 are connected longitudinally by binding members 6. The length of the positioning steel bars 5 is the same as the length of the steel bar row 10 inserted into the steel bar storage compartment 9. A set of positioning grooves 7 is specially set up in the flexible protective net storage compartment 2 to place the positioning steel bars 5. Considering the errors generated during the manufacturing process and construction, the width of the positioning grooves 7 should be greater than the diameter of the positioning steel bars 5. The positioning steel bars 5 are placed in the positioning grooves 7 to ensure the flatness of the flexible protective net 3 during storage and release. The fixing effect of the positioning steel bars 5 can ensure the fit between the flexible protective net 3 and the surrounding rock wall and the steel bar row 10.

[0056] In this embodiment, the top of the flexible protective net storage compartment 2 is equipped with several sets of pulley assemblies 4. Each pulley assembly 4 includes a detachable pulley fixing plate 41, which is fixed to the top of the flexible protective net storage compartment 2 by bolts. A drive shaft passes through the retractable pulley 42, and the pulley's bearing is connected to a rotating shaft 46. Both ends of the rotating shaft 46 are connected to the telescopic ends of a hydraulic rod 44. The fixed end of the hydraulic rod 44 is equipped with a pulley base 45, which is fixedly connected to the pulley fixing plate 41 by welding. A certain pressure is set inside the hydraulic rod 44. When encountering a hollow section during storage or release, the pressure on the retractable pulley 42 decreases, and the telescopic end of the hydraulic rod 44 extends due to internal hydraulic pressure. When encountering a woven screen section, the pressure on the retractable pulley 42 increases, causing the hydraulic rod 44 to automatically retract. This ensures the flatness and fit of the flexible protective net 3 during storage and release, further improving the laying effect. Both ends of the pulley fixing plate 41 are equipped with buffer pulleys 43. The height of the buffer pulleys 43 is lower than the height of the telescopic pulleys 42. The two ends of the rotating shaft 46 of the buffer pulleys 43 are connected to the rigid rods 47 respectively, which facilitates the storage and release of the flexible protective net 3 in the annular storage space of the protective net.

[0057] In this embodiment, an automatic retraction device 8 is provided at the insertion end of the positioning slot 7. A motor 83 is installed on the active roller 822 near the insertion end of the positioning slot 7. The speed and torque of the motor 83 are controlled by a motor control box 84. The remaining driven rollers 823 are connected by a connecting member 824. The support member 81 has a fixed end 811 and a moving end 812. The connecting member 824 is connected to the moving end 812 by welding. The fixed end 811 is fixed to the mounting plate 85 by welding. The automatic retraction device 8 is fixed to the side wall of the insertion end of the positioning slot 7 by bolts. The support member 81 is raised to achieve contact between the conveyor belt 821 and the positioning steel bar 5. The conveyor belt 821 moves the positioning steel bar 5 from the insertion end of the positioning slot 7 towards the TBM shield head, thereby achieving automatic retraction of the flexible protective net 3. During release, the motor 83 is controlled to rotate the conveyor belt 821 in the opposite direction, achieving automatic release of the flexible protective net 3.

[0058] 2. Tunneling stage:

[0059] First, the flexible protective netting 3 is installed inside the flexible protective netting storage compartment 2. Then, the reinforcing steel bar 10 is stored in the designated position. As the TBM shield head advances, the flexible protective netting 3 and the reinforcing steel bar 10 are applied to the free face of the surrounding rock. The exposed ends of the reinforcing steel bar 10 and the flexible protective netting 3 are tied and fixed at fixed intervals in the longitudinal direction of the tunnel. During the TBM excavation process, the reinforcing steel bar 10 gradually covers the free face of the surrounding rock. The flexible protective netting 3 moves synchronously with the reinforcing steel bar 10 and the positioning reinforcing steel bar 5. The flexible protective netting 3 is located between the reinforcing steel bar 10 and the free face of the surrounding rock, playing a protective role in blocking the explosive blocks of rock bursts.

[0060] As the TBM advances, a steel arch frame is constructed behind it according to the design standards. This completes the coordinated protection operation of the steel arch frame supporting the steel reinforcement bar row 10 and positioning steel reinforcement bar 5, and fixing the flexible protective net 3 with the steel reinforcement bar row 10 and positioning steel reinforcement bar 5. This solves the problem of sagging and fixing the flexible protective net 3 during TBM construction.

[0061] Low-prestressed anchor bolts are installed in the intervals of the steel arch frame. The steel bar row 10, the positioning steel bar 5 and the flexible protective net 3 work together to protect the surrounding rock. The anchor bolts and the steel arch frame play a supporting and reinforcing role, forming an integrated and collaborative protection system.

[0062] This embodiment forms an open-type TBM automatic mesh laying construction process, in which the 10 steel bars, 5 positioning steel bars, 3 flexible protective nets, anchor bolts and steel arches play a joint protective role, forming an integrated and collaborative protection system.

[0063] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An automatic mesh laying device for open type TBM rock burst flexible protection mesh, comprising a top shield of a TBM, a steel bar row storage compartment is arranged inside the top shield, characterized in that, Also comprising: A flexible protective net storage compartment between the top shield and the steel bar row storage compartment, a plurality of positioning grooves are arranged inside the flexible protective net storage compartment along the arc direction of the top shield; Positioning steel bars arranged along the length direction of the tunnel for guiding the flexible protective net to enter and exit the flexible protective net storage compartment, the positioning grooves are used to accommodate the positioning steel bars when the positioning steel bars follow the flexible protective net to enter and exit the flexible protective net storage compartment; An automatic winding and unwinding device arranged at the insertion end of the positioning groove, the automatic winding and unwinding device uses a track conveying method to make the positioning steel bars enter or move out of the positioning groove, thereby making the flexible protective net automatically stored or released; The top of the flexible protective net storage compartment is also provided with a flexible protective net flattening assembly, the flexible protective net flattening assembly includes a pulley assembly arranged along the length direction of the top shield, the pulley assembly includes: A pulley fixed plate fixedly arranged on the top of the flexible protective net storage compartment; A plurality of telescopic pulleys fixedly arranged on the pulley fixed plate along the vertical direction, and the bottom of the telescopic pulleys abuts against the flexible protective net; The two ends of the pulley fixed plate along the length direction of the top shield are also respectively provided with buffer pulleys, and the plurality of telescopic pulleys are located between the two buffer pulleys, and the distance between the bottom of the buffer pulleys and the flexible protective net is greater than the distance between the bottom of the plurality of telescopic pulleys and the flexible protective net; The automatic winding and unwinding device includes: A height-adjustable support arranged at the insertion end of the positioning groove; A track conveying assembly arranged on the support, the height of the support is adjusted to make the track conveying assembly fit the positioning steel bars in the positioning groove; The positioning steel bars are arranged at a certain distance along the arc direction of the flexible protective net, and the flexible protective net and the positioning steel bars are connected by a binding member along the longitudinal direction; The flexible protective net flattening assembly applies a downward pressing force to the flexible protective net to make the flexible protective net fit the positioning steel bars, and the steel bar row is output synchronously with the flexible protective net and the positioning steel bars during the paving process.

2. The automatic lacing device for open TBM rockburst flexible protection net according to claim 1, characterized in that, The track conveying assembly is driven by a motor, the motor is connected with a motor control box, and the motor control box is used to adjust the rotating speed or torque of the motor.

3. The automatic lacing device for open TBM rockburst flexible protection net of claim 1, wherein, The length of the positioning steel bar is equal to the length of the steel bar row inserted into the steel bar row storage compartment.

4. The automatic lacing device for open TBM rockburst flexible protection net of claim 1, wherein, The width of the positioning groove is greater than the diameter of the positioning steel bar.

5. The automatic lacing device for open TBM rockburst flexible protection net of claim 1, wherein, The coverage of the flexible protective net storage compartment along the width direction of the vault is at least 120° of the vault width area.

6. The construction method using the automatic net laying device for the open type TBM rock burst flexible protection net according to claim 1, characterized in that, The steps include: First, store the flexible protective net in the flexible protective net storage compartment, and then store the steel bar row in the steel bar row storage compartment; With the TBM shield heading, the flexible protective net, the positioning steel bar and the steel bar row are applied to the free surface of the surrounding rock, and the steel bar row and the exposed end of the flexible protective net are fixed at a fixed interval in the length direction of the tunnel; During the TBM heading process, the steel bar row gradually covers the free surface of the surrounding rock, the flexible protective net moves synchronously with the positioning steel bar and the steel bar row, and the flexible protective net is located between the steel bar row and the free surface of the surrounding rock; With the advancement of the TBM shield, the rear steel arch is constructed according to the design standard, and the collaborative protection operation of the steel arch supporting the steel bar row and the steel bar row fixing the flexible protective net is completed; Low prestressed anchor rods are arranged in the interval between steel arches, the reinforcement bars and flexible protective nets play the role of surrounding rock protection, the anchor rods and steel arches play the role of support and reinforcement, forming an integrated and cooperative protection system.

7. An open TBM characterized by, The automatic net laying device comprises the rock burst flexible protective net according to any one of claims 1-5.

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