Drum-type net-laying device and method for tunnel rock-burst high-toughness energy-absorbing net

Abstract

The application discloses a drum-type net laying device and method for tunnel rock burst high-toughness energy-absorbing net and belongs to the technical field of high-toughness energy-absorbing net laying. The net laying device comprises a length-adjustable support beam group; a net conveying roller of an automatic net conveying device is fixed on a roller fixing arm, and a wheel surface of the net conveying roller is in abutment with a high-toughness energy-absorbing net roll; the roller fixing arm is sleeved on a driving part, and the driving part is fixed on the support beam group; a nail gun of a net material adhering and fixing device is fixed on a pushing and supporting member, one end of the pushing and supporting member is in adhesion with the net material, and the other end is fixed on a telescopic supporting member; the telescopic supporting member is fixedly connected with the support beam group; a rotary adjusting assembly is connected with a lifting arm of a construction machine and the support beam group. In the releasing process of the high-toughness energy-absorbing protective net, the net material has good flatness, the high-toughness energy-absorbing protective net can be closely adhered to a tunnel wall surface, and the net laying operation efficiency of the high-toughness energy-absorbing protective net and the rock burst protection level are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of rock burst high-toughness energy-absorbing net laying, and in particular to a drum-type net laying device and method for a tunnel rock burst high-toughness energy-absorbing net. BACKGROUND

[0002] In the process of tunnel construction, the stability of tunnel excavation is affected by complex geological environment. Among them, under the condition of high ground stress, the dynamic instability phenomenon induced by brittle hard rock after excavation unloading, i.e. rock burst. Rock burst seriously affects the construction safety of tunnel excavation, and there is a great potential safety hazard to life and property. In order to ensure the stability of tunnel excavation, after the excavation of underground cavern, the surrounding rock support as the most direct and effective rock burst prevention measure has been studied more and more, and most of the studies are based on the anchor-high-toughness energy-absorbing net-spraying concrete (referred to as anchor-net-spraying) support system, and the performance of the support system for preventing rock burst is continuously improved.

[0003] At present, the initial spraying concrete-laying high-toughness energy-absorbing protective net-drilling anchor rod-re-spraying concrete is mainly used in the process of drilling and blasting tunnel construction to close and reinforce the surrounding rock of rock burst section. This measure can achieve effective protection of the rock burst section, and to a certain extent, it can control the collapse and explosion of the rock. Among them, the high-toughness energy-absorbing protective net is a new polymer material made of polymeric filament fibers and advanced coating technology. Because it has the advantages of high toughness, good energy-absorbing effect, and low cost, it has gradually become the core component of the tunnel rock burst protection system.

[0004] At present, the laying of high-toughness energy-absorbing protective net is mainly by mechanical laying. There are mainly two forms of mechanical laying device, support rod type laying machine and drum type laying machine. Because the high-toughness energy-absorbing net itself has the characteristics of light weight, high flexibility, etc., when the support rod type laying machine has a large support rod spacing, the high-toughness energy-absorbing net between the two support rods will sag, which not only affects the protective performance of the high-toughness energy-absorbing net, but also affects the subsequent spraying concrete construction effect. If the support rod spacing is small, it will increase the weight and cost of the laying machine arm, and too many mechanical components will occupy a lot of space in the narrow tunnel construction space, which is not conducive to the subsequent construction process. While the drum type laying machine does not have the spacing problem of the support rod type laying machine, but the existing drum type laying machine has the problem of poor flatness of the net material during the release of the high-toughness energy-absorbing protective net, which leads to poor adhesion of the high-toughness energy-absorbing protective net to the tunnel wall. SUMMARY

[0005] The purpose of the present application is to overcome the problems in the prior art, provide a drum-type net laying device and method for tunnel rock burst high-toughness energy-absorbing net, which has good flatness during the release of the high-toughness energy-absorbing net, can make the high-toughness energy-absorbing net closely adhere to the tunnel wall, and improve the net laying operation efficiency and rock burst protection level of the high-toughness energy-absorbing net.

[0006] The drum-type net laying device for tunnel rock burst high-toughness energy-absorbing net comprises a support beam group for bearing a high-toughness energy-absorbing net roll, the support beam group is connected with a hoist arm of a construction machine through a rotary adjusting assembly; and further comprises:

[0007] The automatic net feeding device comprises two net feeding rollers, a roller fixing arm, a longitudinal pressing part and a roller driving member, the two net feeding rollers are arranged along the axial direction of the high-toughness energy-absorbing net roll, and the two net feeding rollers are arranged in front and back staggered positions along the release direction of the high-toughness energy-absorbing net; the net feeding rollers are fixed on the roller fixing arm, the roller fixing arm is sleeved on the longitudinal pressing part, so that the wheel surfaces of the net feeding rollers are in abutment with the high-toughness energy-absorbing net roll, the longitudinal pressing part is fixed on the support beam group, and the roller driving member is connected with each net feeding roller and used for driving each net feeding roller to rotate.

[0008] The net material adhering and fixing device comprises a telescopic support member, a pushing support member and a nail gun, the nail gun is fixed on the pushing support member, one end of the pushing support member is in adhesion with the high-toughness energy-absorbing net, and the other end is fixed on the telescopic support member, the telescopic support member is arranged in parallel to the axial direction of the high-toughness energy-absorbing net roll, and is fixedly connected with the support beam group.

[0009] Preferably, the projection length of the two net feeding rollers on the ground is greater than the length of a single net feeding roller and less than or equal to the sum of the lengths of the two net feeding rollers.

[0010] Preferably, the support beam group comprises a telescopic cross beam and two support inclined beams, the telescopic cross beam is arranged along the axial direction of the high-toughness energy-absorbing net roll and has an adjustable length, one end of each of the two support inclined beams is fixedly connected with two ends of the telescopic cross beam, and the other end of each of the two support inclined beams is detachably connected with two ends of the high-toughness energy-absorbing net roll.

[0011] Preferably, the high-toughness energy-absorbing net roll has a winding shaft in the middle part, the end part of the support inclined beam is further provided with a grabbing and releasing structure matched with the winding shaft, and the outer side of the support inclined beam is further provided with a protective baffle located on the outer side of the grabbing and releasing structure and the winding shaft.

[0012] Preferably, the pushing support member is a plurality of, the plurality of pushing support members are uniformly arranged along the axial direction of the high-toughness energy-absorbing net roll, and the bottom of each pushing support member is provided with a rolling wheel.

[0013] Preferably, the high-toughness energy-absorbing net on the high-toughness energy-absorbing net roll has a widened fixed strip, the pushing support member is attached to the widened fixed strip, and the nail gun is located directly above the widened fixed strip.

[0014] Preferably, the high-toughness energy-absorbing net roll is provided with a net roll baffle at each end, and the net roll baffles are fixed on the winding shaft.

[0015] Preferably, the rotation adjusting assembly comprises a circular flange connecting disc, a semi-rotation hydraulic motor, a rotary motor fixing support, a full-rotation hydraulic motor, and a square flange connecting disc. The circular flange connecting disc is used for fixed connection with the lifting arm of the construction machinery. The semi-rotation hydraulic motor is fixed on the circular flange connecting disc, and the output end is fixed with the rotary motor fixing support. The full-rotation hydraulic motor is fixed on the rotary motor fixing support, and the output end is fixed with the square flange connecting disc. The square flange connecting disc is fixedly connected with the support beam group.

[0016] The application further discloses a net laying method of the drum-type net laying device for the high-toughness energy-absorbing net for tunnel rock burst, which comprises the following steps: loading the high-toughness energy-absorbing net roll on the support beam group, adjusting the high-toughness energy-absorbing net roll to the specified position of the laying section by the lifting arm of the construction machinery, then adjusting the position of the rotation adjusting assembly so that the high-toughness energy-absorbing net at the release end can tightly adhere to the tunnel wall, and then performing anchor rod drilling at the bottom arch foot of the tunnel section and fixing the exposed end of the high-toughness energy-absorbing net.

[0017] The lifting arm of the construction machinery moves along the circumferential direction of the tunnel section, and the two net conveying rollers of the automatic net conveying device start to convey the net during the movement; the net material adhering and fixing device makes the high-toughness energy-absorbing net tightly adhere to the tunnel wall by the pushing support member, and then the nail gun shoots the steel nails at intervals to temporarily fix the high-toughness energy-absorbing net to the tunnel wall.

[0018] The anchor drilling and grouting operation is performed at intervals along the circumferential direction of the tunnel section. After the high-toughness energy-absorbing net laying and anchor rod drilling of the whole section are completed, the above process is repeated to start the next cycle of net laying and anchor drilling and grouting operation until the high-toughness energy-absorbing net laying and anchor rod drilling of the whole tunnel are completed.

[0019] Compared with the prior art, the beneficial effects of the present application are: the drum-type net laying device for tunnel rock burst high-toughness energy-absorbing net provided by the present application bears the high-toughness energy-absorbing net roll through the support beam group, and the support beam group is connected with the lifting arm of the construction machine through the rotary adjusting assembly, so that the position of the high-toughness energy-absorbing net roll can be flexibly adjusted, the net laying device can reach any position of the tunnel section, and the net laying of the tunnel section is realized without dead angle; the two net feeding rollers of the automatic net feeding device are arranged along the axial direction of the high-toughness energy-absorbing net roll, and the two net feeding rollers are arranged in front and back staggered positions along the release direction of the high-toughness energy-absorbing net, so that the high-toughness energy-absorbing net is controlled in double tension, the shaking, twisting and uneven deformation of the net material during release can be reduced, and the high-toughness energy-absorbing net on the high-toughness energy-absorbing net roll can be released flatly; the net material adhering and fixing device can adhere and fix the flatly released high-toughness energy-absorbing net to the inner wall of the tunnel, and the nail gun temporarily fixes the high-toughness energy-absorbing net adhered to the inner wall of the tunnel; therefore, the high-toughness energy-absorbing protective net released by the drum-type net laying device for tunnel rock burst high-toughness energy-absorbing net has high flatness, and the laid high-toughness energy-absorbing protective net has high adhesion to the tunnel wall surface, so that the net laying operation efficiency and rock burst protection level of the high-toughness energy-absorbing protective net are improved.

[0020] The net laying device of the present application is highly targeted and focuses on the high-toughness energy-absorbing net laying construction of the rock burst section of the tunnel constructed by the drill-and-blast method. During the construction process of the drill-and-blast method tunnel, it is impossible to ensure that the excavation contour surface is completely smooth, and the surface of the tunnel wall surface without secondary lining is uneven, which leads to poor laying and subsequent use effect of the high-toughness energy-absorbing net. Through the flat release of the high-toughness energy-absorbing net by the automatic net feeding device of the present application and the re-pressing adhesion of the net material adhering and fixing device, the high-toughness energy-absorbing net is closely adhered to the tunnel wall surface of the drill-and-blast method, and the subsequent shotcrete process and the like can be smoothly performed without poor adhesion of the high-toughness energy-absorbing net. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is the construction flowchart of the embodiment of the present application.

[0022] Figure 2 is the overall schematic diagram of the intelligent drum-type net laying mechanical device of the embodiment of the present application.

[0023] Figure 3 is the structural schematic diagram of the rotary adjusting assembly of the embodiment of the present application.

[0024] Figure 4 is the structural schematic diagram of the support beam group of the embodiment of the present application.

[0025] Figure 5 is the structural schematic diagram of the automatic net feeding device of the embodiment of the present application.

[0026] Figure 6 is the structural schematic diagram of the net material adhering and fixing device of the embodiment of the present application.

[0027] Figure 7 is a structural schematic diagram of a high-toughness energy-absorbing net roll of an embodiment of the present application.

[0028] Legend:

[0029] 1, rotating adjustment assembly; 1-1, circular flange connecting disc; 1-2, semi-rotary hydraulic motor; 1-3, full-rotary hydraulic motor; 1-4, rotating motor fixing support; 1-5, square flange connecting disc; 2, support beam group; 2-1, telescopic cross beam; 2-2, hydraulic telescopic rod; 2-3, support inclined beam; 2-4, hydraulic transmission rod; 2-5, net roll fixing buckle; 2-6, protective baffle; 3, automatic net conveying device; 3-1, longitudinal compression part; 3-2, roller fixing arm; 3-3, hydraulic servo motor; 3-4, net conveying roller; 4, net material adhering and fixing device; 4-1, square fixing disc; 4-2, telescopic support member; 4-3, push and compression support member; 4-4, nail gun; 5, high-toughness energy-absorbing net roll; 5-1, winding shaft; 5-2, net roll baffle; 5-3, widened fixed strip. DETAILED DESCRIPTION

[0030] In order to make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions of the embodiments of the present application will be described clearly and completely below with reference to the drawings of the embodiments of the present application. Obviously, the described embodiments are some, but not all of the embodiments of the present application. Based on the described embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort belong to the scope of protection of the present application.

[0031] Unless otherwise defined, technical terms or scientific terms used herein should be understood as having the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terms “first”, “second”, and similar terms used herein do not denote any order, quantity, or importance, but are used to distinguish different components. The terms “include” or “contain” and similar terms mean that the elements or objects appearing before “include” or “contain” cover the elements or objects listed after “include” or “contain” and their equivalents, and do not exclude other elements or objects. The terms “connect” or “connected” and similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms “up”, “down”, “left”, “right”, and the like are used only to represent relative positional relationships, and when the absolute positions of the described objects change, the relative positional relationships may also change accordingly.

[0032] The embodiment provides a drum-type net laying device for tunnel rock burst high-toughness energy-absorbing net, which comprises a support beam group 2 for bearing a high-toughness energy-absorbing net roll 5, and the support beam group 2 is connected with a hoist arm of a construction machine through a rotary adjusting assembly 1. Figure 2 and Figure 3 As shown in the figure, the rotary adjusting assembly 1 comprises a circular flange connecting disc 1-1, a semi-rotation hydraulic motor 1-2, a rotary motor fixed support 1-4, a full-rotation hydraulic motor 1-3 and a square flange connecting disc 1-5, the circular flange connecting disc 1-1 is used for fixed connection with the hoist arm of the construction machine, the construction machine can be a three-arm rock drilling jumbo, the semi-rotation hydraulic motor 1-2 is fixed on the circular flange connecting disc 1-1 and the output end is fixed with the rotary motor fixed support 1-4, the full-rotation hydraulic motor 1-3 is fixed on the rotary motor fixed support 1-4 and the output end is connected with the square flange connecting disc 1-5, and the square flange connecting disc 1-5 is fixedly connected with the support beam group 2. The semi-rotation hydraulic motor 1-2 of the embodiment can drive the rotary motor fixed support 1-4 to swing, so that the whole drum-type net laying device realizes 0°~180° swing, and is used for accurately controlling the net laying angle and local adjustment. The full-rotation hydraulic motor 1-3 can drive the square flange connecting disc 1-5 to rotate, and can realize 0°~360° swing of the drum-type net laying device, and is used for adjusting the all-directional net laying direction of the equipment. The two hydraulic motor groups cooperate to realize accurate control of the net laying angle, and through the hoist arm of the construction machine and the rotary adjusting assembly 1 in the embodiment, the net laying device can reach any position of a tunnel section.

[0033] When the high-toughness energy-absorbing net is pushed to the wall in a relatively flat state, the contact between the high-toughness energy-absorbing net and the wall is progressive, and the fibers or nodes of the high-toughness energy-absorbing net begin to elastically deform almost simultaneously, and the stress is uniformly distributed on the entire net surface, so that the high-toughness energy-absorbing net can conform to the profile of the wall and realize close fitting through uniform stretching and bending. The uneven net material has wrinkles, wavy bending or local curling, which means that there is already a pre-stress or initial deformation in the net surface, which ultimately leads to point or line contact between the net material and the wall, rather than ideal surface contact, greatly reducing the overall carrying capacity and energy-absorbing uniformity of the protective net. Therefore, in order to improve the release flatness of the high-toughness energy-absorbing net, the drum-type net laying device for the high-toughness energy-absorbing net of the tunnel rock burst further comprises an automatic net feeding device 3, the automatic net feeding device 3 comprises two net feeding rollers 3-4, a roller fixing arm 3-2, a longitudinal pressing part 3-1 and a roller driving member, both of the two net feeding rollers 3-4 are arranged along the axis direction of the high-toughness energy-absorbing net roll 5, and the two net feeding rollers 3-4 are arranged staggered forward and backward along the release direction of the high-toughness energy-absorbing net. In the embodiment, the two net feeding rollers 3-4 are arranged staggered forward and backward along the release direction of the high-toughness energy-absorbing net, and are parallel to the axis of the high-toughness energy-absorbing net roll 5. As a preferred embodiment, the two net feeding rollers 3-4 are designed to be equal in length. In the embodiment, one net feeding roller 3-4 pulls the net material that has not been unfolded; the other net feeding roller 3-4 provides following support force or secondary leveling force to the unfolded net material. Double tension control of the high-toughness energy-absorbing net can reduce the shaking, twisting and uneven deformation of the net material during release. In the complex tunnel operation environment, a single net feeding roller 3-4 is easy to slip when encountering high friction resistance, and the arrangement of the front and rear double net feeding rollers 3-4 can effectively disperse the traction load, making the system more stable.

[0034] In the embodiment, the net feeding rollers 3-4 are fixed on the roller fixing arm 3-2, the roller fixing arm 3-2 is sleeved on the longitudinal pressing part 3-1, so that the wheel surface of the net feeding roller 3-4 abuts against the high-toughness energy-absorbing net roll 5, the longitudinal pressing part 3-1 is fixed on the support beam group 2, and the roller driving member is connected with each net feeding roller 3-4 for driving the rotation of each net feeding roller 3-4. Figure 2 and Figure 5As shown, the automatic net feeding device 3 of the embodiment comprises a longitudinal pressing part 3-1, a roller fixing arm 3-2, two hydraulic servo motors 3-3 as roller driving members, and two net feeding rollers 3-4. The top of the longitudinal pressing part 3-1 is connected to the telescopic cross beam 2-1 by bolts or rivets, and the longitudinal pressing part 3-1 can be of an elastic structure or a hydraulic structure as an example. The pressure of the longitudinal pressing part 3-1 is transmitted to the net feeding rollers 3-4 through the roller fixing arm 3-2. In the initial state, the longitudinal pressing part 3-1 is pre-set with a certain pressure. During the laying of the high-toughness energy-absorbing net, the size of the high-toughness energy-absorbing net roll 5 gradually decreases as the laying construction proceeds, and the pressure of the longitudinal pressing part 3-1 also decreases accordingly. The roller fixing arm 3-2 relies on the elastic reset or internal hydraulic pressure of the longitudinal pressing part 3-1 to achieve elongation, so as to ensure the abutment and smoothness of the high-toughness energy-absorbing net roll 5 during the release process, and further improve the laying effect. Under the pressure of the longitudinal pressing part 3-1, the net feeding rollers 3-4 are in close contact with the surface of the high-toughness energy-absorbing net roll 5, which ensures the overall quality of the process of releasing the high-toughness energy-absorbing net roll 5 as flat high-toughness energy-absorbing net. As a more preferred embodiment, the embodiment realizes the synchronization of the release and laying speed of the high-toughness energy-absorbing net by controlling the speed and torque of the servo control motor.

[0035] The net material fitting and fixing device 4 of the embodiment comprises a telescopic support member 4-2, a pushing and pressing support member 4-3, and a nail gun 4-4. The nail gun 4-4 is fixed to the pushing and pressing support member 4-3. One end of the pushing and pressing support member 4-3 is in contact with the net material, and the other end is fixed to the telescopic support member 4-2. The telescopic support member 4-2 is parallel to the high-toughness energy-absorbing net roll 5, and is fixedly connected to the support beam group 2. Figure 6As shown, the web material fixing device 4 in this embodiment is connected to the telescopic cross beam 2-1 by a square fixing disc 4-1 in the form of bolts or rivets, the telescopic support member 4-2 is connected to the square fixing disc 4-1 in the form of bolts or rivets, the length of the square fixing disc 4-1 is 0.5 m, the telescopic support member 4-2 is adjusted in width by the hydraulic telescopic rod 2-2, the telescopic range of the telescopic support member 4-2 is 2.5 m-4 m, which can adapt to the laying requirements of high-toughness energy-absorbing nets of different widths. The push support member 4-3 can be an elastic structure, which can automatically shorten the length when subjected to pressure and automatically return to the initial length when the pressure disappears, the push support member 4-3 is always perpendicular to the widened fixed strip 5-3 of the high-toughness energy-absorbing net, a nail gun 4-4 is fixed at the bottom of the push support member 4-3, and the nail gun 4-4 is perpendicular to the widened strip of the widened fixed strip 5-3, and the nail outlet of the nail gun 4-4 is located directly above the widened strip. This embodiment can adapt to the temporary fixing of the high-toughness energy-absorbing net during the laying process by the telescopic support member 4-2; the push support member 4-3 can make the net material closely adhere to the tunnel wall, which is convenient for the subsequent temporary fixing operation of the nail gun 4-4, and the nail gun 4-4 shoots the steel nails to temporarily fix the high-toughness energy-absorbing net on the tunnel wall.

[0036] In order to further improve the release flatness of the high-toughness energy-absorbing net roll 5, as another preferred embodiment, the projection length of the two web feeding rollers 3-4 on the ground is greater than the length of a single web feeding roller 3-4 and less than or equal to the length sum of the two web feeding rollers 3-4. In this embodiment, in order to avoid that the distance between the two web feeding rollers 3-4 is too large, which leads to weak control of the middle area during the release process and may cause slight bending or snake-shaped expansion. In this embodiment, the distance between the axes of the two web feeding rollers 3-4 is 50 mm-80 mm (less than the mesh size of a high-toughness energy-absorbing net), and the projection length of the two web feeding rollers 3-4 on the ground is between the length of a single roller and the length of a double roller, more specifically, the length of the overlapping part of the projection of the two web feeding rollers 3-4 on the ground is 20%-30% of the length sum of the two web feeding rollers 3-4; the purpose is to form a continuous pressure distribution zone in the middle of the high-toughness energy-absorbing net, form a continuous tension-compression combined action, so that the high-toughness energy-absorbing net is always in a controlled tension state, avoid bending or snake-shaped expansion, and improve the laying flatness.

[0037] The high-toughness energy-absorbing net in this embodiment belongs to a lightweight and high-flexibility structure, if the roller axial length coverage is insufficient, the edge area may appear edge curling or corner loosening during release due to insufficient compression or uneven friction, therefore, as another preferred solution, the coverage range of the two web feeding rollers 3-4 is the full length of the high-toughness energy-absorbing net roll 5, which is more beneficial to the flat release of the net roll. The double web feeding rollers 3-4 in this embodiment can ensure that the full-width web material is uniformly stressed and flatly released by combining with a large axial coverage length.

[0038] If the feeding roller 3-4 is not rigid enough or is not supported evenly, the longer feeding roller 3-4 may sag at the edge, affecting the quality of the lamination. The middle section of the feeding roller 3-4 structure can consider using lightweight composite materials to enhance rigidity. For example, lightweight composite materials can use aluminum-lithium alloy, titanium-aluminum alloy, magnesium alloy, and titanium alloy, among which the most typical is aluminum-lithium alloy, which has higher strength, lighter weight, and anti-fatigue and corrosion resistance. As another preferred way, the feeding roller 3-4 can also be designed as a segment-adjustable structure to adapt to different width requirements. More specifically, when it is necessary to expand the axial coverage length of the feeding roller 3-4, a flange is reserved on the support beam group 2, and another Figure 5 The automatic feeding device 3 shown can be used.

[0039] As another preferred embodiment, the support beam group 2 includes a telescopic cross beam 2-1 and two support inclined beams 2-3. The telescopic cross beam 2-1 is arranged along the axis direction of the high-toughness energy-absorbing web roll 5, and the length of the axis direction of the high-toughness energy-absorbing web roll 5 is adjustable. One end of each of the two support inclined beams 2-3 is fixedly connected to one end of the telescopic cross beam 2-1, and the other end of each of the two support inclined beams 2-3 is detachably connected to the other end of the high-toughness energy-absorbing web roll 5. In this embodiment, by adjusting the length of the telescopic cross beam 2-1, the web roll of different widths can be matched without the need to replace the support structure, significantly improving the versatility of the equipment. The length adjustment of the telescopic cross beam 2-1 can be achieved by, for example, hydraulic, threaded, or bayonet-type telescoping.

[0040] As another preferred embodiment, the high-toughness energy-absorbing web roll 5 has a winding shaft 5-1 in the middle. The end of the support inclined beam 2-3 is also provided with a grab-and-release structure that cooperates with the winding shaft 5-1. The outer side of the support inclined beam 2-3 is also provided with a protective baffle 2-6 located on the outer side of the grab-and-release structure and the winding shaft 5-1. The grab-and-release structure at the end of the support inclined beam 2-3 cooperates with the winding shaft 5-1 to achieve quick installation, disassembly, and axial fixation of the web roll, avoiding accidental falling or deviation of the web roll during construction. The grab-and-release structure can be, for example, a buckle, a bearing, or a flange connection. The grab-and-release structure can evenly transfer the weight and traction of the web roll to the support inclined beam 2-3, preventing deformation or damage caused by local stress concentration. During the release of the web material, the grab-and-release structure can rotate with the winding shaft 5-1, reducing frictional resistance while maintaining stable radial support to avoid the web roll from shaking due to inertia.

[0041] As shown in FIG. 1, the automatic feeding device 3 includes a support beam group 2 and a high-toughness energy-absorbing web roll 5. Figure 2 As shown in FIG. 1, the automatic feeding device 3 includes a support beam group 2 and a high-toughness energy-absorbing web roll 5. Figure 4As shown, the main structure of the support beam group 2 in the embodiment includes one telescopic cross beam 2-1 and two support inclined beams 2-3. The telescopic cross beam 2-1 is connected with a hydraulic telescopic rod 2-2 at the upper part, and the two ends of the hydraulic telescopic rod 2-2 are connected with the fixed end and the moving end of the telescopic cross beam 2-1 respectively. The width of the telescopic cross beam 2-1 is adjustable, and the telescopic length ranges from 2.5m to 4m, which can adapt to the laying of high-toughness energy-absorbing nets with different width requirements in tunnels. The upper end of the support inclined beam 2-3 is connected with the telescopic cross beam 2-1 through bolts or rivets, and the lower end of the support inclined beam 2-3 is provided with a grab-and-release structure. As an example, the grab-and-release structure is composed of a hydraulic transmission rod 2-4 and a net roll fixing buckle 2-5. The hydraulic transmission rod 2-4 can control the opening and closing of the fixing buckle. When the high-toughness energy-absorbing net roll 5 is grabbed, the net roll fixing buckle 2-5 is in an open state. After the two ends of the winding shaft 5-1 are grabbed by the net roll fixing buckle 2-5, the hydraulic transmission rod 2-4 is operated to make the net roll fixing buckle 2-5 become a closed state, and the grabbing of the high-toughness energy-absorbing net roll 5 is completed. After the grabbing process is completed, the winding shaft 5-1 can rotate freely in the net roll fixing buckle 2-5. The outer side of the high-toughness energy-absorbing net grabbing component is provided with a protective baffle 2-6, which protects the whole grabbing and fixing component.

[0042] As another preferred embodiment, as shown in Figure 6 The push support component 4-3 is provided with a plurality of rolling wheels at the bottom, and the uniformly arranged push support components 4-3 can cover the full width of the net roll, avoiding the sagging of the middle part or the warping of the edge of the net material due to the sparse support points, and the pressure of each support point is balanced, preventing the net material from being wrinkled, twisted or serpentine expanded during the release process due to uneven local pressure.

[0043] As another preferred embodiment, as shown in Figure 7 The high-toughness energy-absorbing net on the high-toughness energy-absorbing net roll 5 has a widened fixed strip 5-3, the push support component 4-3 is attached to the widened fixed strip 5-3, and the nail gun 4-4 is located directly above the widened fixed strip 5-3. The widened fixed strip 5-3 in the embodiment serves as a local reinforcing area of the high-toughness energy-absorbing net, which can withstand higher pushing pressure and nail penetration force, avoiding edge tearing or tensile deformation of the net material during pressure or fixation. The push support component 4-3 precisely attaches to the fixed strip, so that the pressure is concentrated in the high-strength area, rather than directly acting on the flexible net surface, reducing the risk of damage to the net material. The nail gun 4-4 is designed to face the fixed strip, ensuring that the nail always penetrates the high-strength area, avoiding nail body deflection or fixation due to the flexibility of the net material.

[0044] As another preferred embodiment, the high-toughness energy-absorbing net roll 5 is provided with a net roll baffle 5-2 at both ends, and the net roll baffle 5-2 is fixed on the winding shaft 5-1. In this embodiment, the net roll baffle 5-2 prevents axial slippage or loosening of the high-toughness energy-absorbing net during the release process through physical limiting, avoiding release chaos caused by the end part coming off; the baffle forces the net material to be neatly stacked along the winding shaft 5-1, and in the process of rapid release, it can ensure that each circle is uniformly stressed to prevent local accumulation or collapse.

[0045] In this embodiment, the net laying method of the drum-type net laying device for tunnel rock burst high-toughness energy-absorbing net is as shown in Figure 1 , and the specific process is as follows:

[0046] Before construction, one end of the widened solid strip 5-3 short side is temporarily fixed on the winding shaft 5-1 by using a nylon tie or other temporary fixing member, and the unwound high-toughness energy-absorbing net is processed into a net roll state by using a net winding machine. The net roll baffle 5-2 is installed at both ends of the net roll to prevent the high-toughness energy-absorbing net roll 5 from coming off during construction. At the same time, the net roll processing of the high-toughness energy-absorbing net can reduce the area of the high-toughness energy-absorbing net, which is convenient for the subsequent net laying construction process.

[0047] The ends of the winding shaft 5-1 at both ends of the high-toughness energy-absorbing net roll 5 are grabbed by the net roll fixing buckle 2-5 at both ends of the support beam group 2, and the entire drum-type net laying device is transported to the construction site by using a large construction machine. The high-toughness energy-absorbing net roll 5 has a certain length of unwound high-toughness energy-absorbing net.

[0048] The lifting arm of the large construction machine adjusts the drum-type net laying device to the specified position of the laying section, and then adjusts the position of the drum-type net laying device so that the high-toughness energy-absorbing net closely adheres to the tunnel wall and generates a certain pressure on the pushing support member 4-3. The anchor rod is drilled at the arch foot of the tunnel section bottom by using the drilling and anchoring mechanical arm of the large construction machine, and one end of the short side of the high-toughness energy-absorbing net is fixed.

[0049] The lifting arm of the construction machine moves along the circumferential direction of the tunnel section, and the driving part of the automatic net feeding device 3 starts to feed the net during the movement. The driving part of the automatic net feeding device 3 is a hydraulic servo motor 3-3, which dynamically adjusts the motor speed according to the construction scene to ensure that the high-toughness energy-absorbing net release and laying process are consistent. The net material adheres to the fixing device 4, which uses the pushing support member 4-3 to make the high-toughness energy-absorbing net closely adhere to the tunnel wall, and then the nail gun 4-4 shoots out steel nails at a certain distance to temporarily fix the high-toughness energy-absorbing net to the tunnel wall.

[0050] The drilling and anchoring mechanical arm of the construction machine performs drilling and anchoring construction every certain distance along the circumferential direction of the tunnel section, and the anchor rod plays a role in reinforcing the surrounding rock and permanently fixing the high-toughness energy-absorbing net.

[0051] After the high-toughness energy-absorbing net is laid and the anchor rod is installed on the whole section, the repeated loading operation starts the next cycle of net laying and anchor drilling and grouting operation.

[0052] The embodiment forms a drum-type net laying construction process of a high-toughness energy-absorbing net for rock burst in a tunnel drilling and blasting method. A three-arm rock drilling jumbo, on the basis of original drilling, grouting, anchor rod installation and other construction equipment, integrates the net laying device of the present application, greatly improves the net laying efficiency and quality, and forms an integrated collaborative protection system.

[0053] Although the embodiments of the present application have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and alterations can be made thereto without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A drum-type net-laying device for a high-toughness energy-absorbing net for tunnel rockburst, characterized in that, The support beam group comprises a telescopic cross beam and two support inclined beams, the telescopic cross beam is arranged along the axis direction of the high-toughness energy-absorbing net roll and has an adjustable length, one end of each of the two support inclined beams is fixedly connected with two ends of the telescopic cross beam, and the other end of each of the two support inclined beams is detachably connected with two ends of the high-toughness energy-absorbing net roll. The automatic net feeding device comprises two net feeding rollers, a roller fixing arm, a longitudinal pressing part and a roller driving member, the two net feeding rollers are arranged along the axis direction of the high-toughness energy-absorbing net roll, and the two net feeding rollers are arranged in front of and behind each other along the release direction of the high-toughness energy-absorbing net, the net feeding rollers are fixed on the roller fixing arm, the roller fixing arm is sleeved on the longitudinal pressing part, so that the wheel surface of the net feeding roller is in abutment with the high-toughness energy-absorbing net roll, the longitudinal pressing part is fixed on the support beam group, and the roller driving member is connected with each net feeding roller and used for driving each net feeding roller to rotate. The net material adhering and fixing device comprises a telescopic supporting member, a pushing supporting member and a nail gun, the nail gun is fixed on the pushing supporting member, one end of the pushing supporting member is adhered to the high-toughness energy-absorbing net, and the other end of the pushing supporting member is fixed on the telescopic supporting member, the telescopic supporting member is arranged in parallel to the axis direction of the high-toughness energy-absorbing net roll and is fixedly connected with the support beam group, the pushing supporting member is a plurality of, the plurality of pushing supporting members are uniformly arranged along the axial direction of the high-toughness energy-absorbing net roll, the bottom of each pushing supporting member is provided with a rolling wheel, the high-toughness energy-absorbing net on the high-toughness energy-absorbing net roll has a widened fixed strip, the pushing supporting member is adhered to the widened fixed strip, and the nail gun is located directly above the widened fixed strip.

2. The drum-type net-laying device for tunnel rock-burst high-tenacity energy-absorbing nets according to claim 1, characterized in that, The projection length of the two net feeding rollers on the ground is greater than the length of a single net feeding roller and is less than or equal to the length of the two net feeding rollers.

3. The drum-type net-laying device for tunnel rock-burst high-tenacity energy-absorbing nets according to claim 1, characterized in that, The support beam group comprises a telescopic cross beam and two support inclined beams, the telescopic cross beam is arranged along the axis direction of the high-toughness energy-absorbing net roll and has an adjustable length, one end of each of the two support inclined beams is fixedly connected with two ends of the telescopic cross beam, and the other end of each of the two support inclined beams is detachably connected with two ends of the high-toughness energy-absorbing net roll.

4. The drum-type net-laying device for tunnel rock-burst high-tenacity energy-absorbing nets according to claim 3, characterized in that, The high-toughness energy-absorbing net roll has a winding shaft in the middle part, the end part of the support inclined beam is further provided with a grabbing structure matched with the winding shaft, and the outer side of the support inclined beam is further provided with a protective baffle located on the outer side of the grabbing structure and the winding shaft.

5. The drum-type net-laying device for tunnel rock-burst high-tenacity energy-absorbing nets according to claim 4, characterized in that, Both ends of the high-toughness energy-absorbing net roll are provided with a net roll baffle fixed on the winding shaft.

6. The drum-type net-laying device for tunnel rock-burst high-tenacity energy-absorbing nets of claim 1, wherein, The rotating adjusting assembly comprises a circular flange connecting disc, a semi-rotation hydraulic motor, a rotating motor fixing support, a full-rotation hydraulic motor and a square flange connecting disc, the circular flange connecting disc is used for fixedly connecting with the lifting arm of the construction machine, the semi-rotation hydraulic motor is fixed on the circular flange connecting disc and fixedly connected with the rotating motor fixing support at the output end, the full-rotation hydraulic motor is fixed on the rotating motor fixing support and connected with the square flange connecting disc at the output end, and the square flange connecting disc is fixedly connected with the support beam group.

7. The method for laying the net of high tenacious energy-absorbing net for tunnel rock-burst according to any one of claims 1-6, characterized in that, The method comprises the following steps: The high-toughness energy-absorbing net roll is loaded on the support beam group, the lifting arm of the construction machine is used to adjust the high-toughness energy-absorbing net roll to the specified position of the laying section, then the rotating adjusting assembly is adjusted to make the high-toughness energy-absorbing net at the release end closely adhere to the tunnel wall, and then the anchor rod is applied at the bottom arch foot of the tunnel section, and the exposed end of the high-toughness energy-absorbing net is fixed. The hoisting arm of the construction machinery moves along the circumferential direction of the tunnel section, and the two net feeding rollers of the automatic net feeding device start to feed the net during the movement; the net fitting and fixing device uses the pushing and supporting member to make the high-toughness energy-absorbing net closely fit the tunnel wall surface, and then the nail gun shoots out steel nails at intervals to temporarily fix the high-toughness energy-absorbing net on the tunnel wall surface; The drilling, anchoring and grouting operation is carried out every certain distance along the circumferential direction of the tunnel section, and after the high-toughness energy-absorbing net laying and anchor rod construction of the whole section are completed, the above process is repeated to start the next cycle of net laying and drilling, anchoring and grouting operation until the high-toughness energy-absorbing net laying and anchor rod construction of the whole tunnel are completed.

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