CN-121976825-A - High-toughness energy-absorbing net-tunnel wall surface attaching and temporary fixing device and method

CN121976825ACN 121976825 ACN121976825 ACN 121976825ACN-121976825-A

Abstract

The invention discloses a device and a method for attaching and temporarily fixing a high-toughness energy-absorbing net-tunnel wall surface, and belongs to the technical field of high-toughness energy-absorbing net laying. The invention discloses a high-toughness energy-absorbing net which is characterized in that a pressure sensor attached to a compacting unit is circumferentially arranged on a rolling wheel, a nail shooting comprises a nail rod and a sleeve sleeved outside the nail rod, a plurality of split grooves extending along the axial direction of the nail rod are formed in the side wall of the sleeve, the sleeve moves towards the outer end part of the nail rod when the nail rod enters a wall surface, so that a split body separated at the split grooves is converted into a transverse retaining structure from a folded state parallel to the nail rod, a control unit is in signal connection with the pressure sensor, a compacting driving rod and a nail shooting gun, the control unit is used for comparing the detection value of the pressure sensor with a set threshold range and regulating the compacting force, and when the pressure of the pressure sensor is located in the set threshold range and lasts for a preset time, the nail shooting gun emits the nail to realize temporary fixation.

Inventors

YANG WEIMIN
XU YUJI
SUN HAOCHENG
WANG MEIXIA
ZHANG ZHIYUAN
SONG XUAN
TIAN CONG
GAO JIAN
LUO LICHENG
GUO YAN

Assignees

山东大学

Dates

Publication Date: 20260505
Application Date: 20260407

Claims (10)

1. The utility model provides a high-toughness energy-absorbing net-tunnel wall laminating and temporary fixing device which characterized in that includes: The laminating and compacting unit is used for laminating the high-toughness energy-absorbing net and the tunnel wall surface and comprises a compacting driving rod, a rolling wheel and a pressure sensor, wherein one end of the compacting driving rod is connected with the rolling wheel, the other end of the compacting driving rod is connected to the supporting member, and the pressure sensor is circumferentially arranged on the rolling wheel along the rolling wheel; The temporary fixing device comprises a nail shooting gun and a nail gun used for shooting the nail, wherein the nail shooting gun comprises a nail rod and a sleeve sleeved outside the nail rod, a plurality of split grooves extending along the axial direction of the nail rod are formed in the side wall of the sleeve, and the sleeve moves towards the outer end part of the nail rod when the nail rod enters the wall surface, so that the side wall of the sleeve separated from the split grooves is used as a split body to be converted into a transverse retaining structure from a folded state parallel to the nail rod; The control unit is in signal connection with the pressure sensor, the compaction driving rod and the nail gun, and is used for controlling the compaction driving rod to extend to improve compaction force when the detection value of the pressure sensor is lower than a threshold range and controlling the compaction driving rod to retract to reduce compaction force when the detection value of the pressure sensor is higher than the threshold range according to the comparison between the detection value of the pressure sensor and the set threshold range, and the nail gun is used for emitting nails to realize temporary fixation after the pressure of the pressure sensor is in the set threshold range and lasts for a preset time.
2. The device for attaching and temporarily fixing a wall surface of a high-toughness energy-absorbing net to a tunnel according to claim 1, wherein the top and the middle lower part of each of the petals separated by two adjacent petal grooves on the sleeve are respectively provided with a thickness reduction area, and the thinnest part of the thickness reduction areas forms a guide line along the width direction of the petals, so that the petals are folded along the guide line when being converted from a folded state to a transverse retaining structure.
3. The high-toughness energy absorbing net-tunnel wall surface attaching and temporary fixing device according to claim 1, wherein a fixing ring and a sliding ring are further arranged on the nail rod, the fixing ring is fixedly sleeved on the outer end portion of the nail rod and provided with a locking structure, the sliding ring is sleeved on the nail rod and can axially slide along the nail rod, an elastic component matched with the locking structure is arranged on the sliding ring sleeve, when a shooting nail hits wall surrounding rock, the sliding ring moves towards the outer end portion of the nail rod, the valve body is pushed to be separated from the valve separating groove, and when the sliding ring moves to a preset position, the elastic component is clamped with the locking structure, so that unidirectional locking is achieved.
4. The high-toughness energy absorbing net-tunnel wall fitting and temporary fixing device according to claim 3, wherein the locking structure comprises a guide slope formed on the fixing ring and a limit hook positioned at the tail end of the guide slope, the cross section width of the guide slope gradually decreases along the direction towards the nail head, and the limit hook is provided with a stop surface which is acute or perpendicular to the axis of the nail rod.
5. The high-toughness energy absorbing net-tunnel wall attaching and temporary fixing device according to claim 4, wherein the elastic component is at least one flexible pulling piece extending from the inner peripheral wall of the sliding ring to the axis direction, the end of the flexible pulling piece is located in the inner diameter range of the sliding ring in a free state, when the sliding ring moves to enable the flexible pulling piece to contact the guiding slope, the flexible pulling piece is pressed to elastically bend outwards in a radial direction, and after the flexible pulling piece passes over the guiding slope and enters the limiting hook, the flexible pulling piece is restored inwards in a radial direction by means of restoring force generated by self elasticity, and the end of the flexible pulling piece is clamped behind the stopping surface of the limiting hook.
6. The high-toughness energy-absorbing net-tunnel wall surface attaching and temporary fixing device according to claim 5, wherein the number of the flexible pulling sheets is two or four, the flexible pulling sheets are uniformly distributed along the circumferential direction of the sliding ring, and the same number of the leading-in slope and limit hook combinations are correspondingly arranged in the locking structure.
7. The high-toughness energy absorbing net-tunnel wall fitting and temporary fixing device according to claim 5, wherein the inner wall of the sliding ring is provided with balls or bearings, and the sliding ring is in rolling contact with the outer surface of the nail rod through the balls or bearings.
8. The high-toughness energy-absorbing net-tunnel wall surface attaching and temporary fixing device according to claim 1, wherein the nail gun is connected with the moving end of the pressing driving rod through a connecting piece so that the position of the nail gun changes along with the movement of the pressing driving rod, and the nail outlet is aligned with the reinforcing strip on the high-toughness energy-absorbing net.
9. The high-toughness energy absorbing net-tunnel wall surface attaching and temporary fixing device according to claim 1, wherein the control unit is further used for calculating an instantaneous pressure change rate according to the real-time pressure change, and when the instantaneous pressure change rate is greater than a set value, the control unit controls the compression driving rod to retract and synchronously sends out an alarm signal.
10. The method for attaching and temporarily fixing the high-toughness energy-absorbing net-tunnel wall attaching and temporarily fixing device according to any one of claims 1 to 9, comprising the steps of positioning equipment carrying high-toughness energy-absorbing net rolls to a laying starting position of the tunnel wall, controlling the attaching and pressing unit to act to press the high-toughness energy-absorbing net to the wall, monitoring the contact pressure in real time through the pressure sensor, adjusting the pressing force through the control unit to enable the high-toughness energy-absorbing net to be tightly attached to the wall, triggering the nail gun to hit nails into the wall to temporarily fix the high-toughness energy-absorbing net when the attaching state is judged to meet the preset condition by the control unit, and repeating the operation in the equipment moving position to gradually finish the laying and temporarily fixing of the high-toughness energy-absorbing net along the tunnel annular direction.

Description

High-toughness energy-absorbing net-tunnel wall surface attaching and temporary fixing device and method Technical Field The invention relates to the technical field of high-toughness energy-absorbing net laying, in particular to a device and a method for attaching and temporarily fixing a high-toughness energy-absorbing net-tunnel wall surface. Background In a tunnel constructed by a drilling and blasting method, in order to prevent and treat rock blasting disasters, a composite support system of primary spraying concrete, paving an energy-absorbing protective net, drilling, grouting an anchor rod, and re-spraying concrete is generally adopted, and the paving quality of a high-toughness energy-absorbing net in the composite support system is a key for ensuring that sprayed concrete forms a uniform, compact and high-strength protective structure. However, the phenomenon of super-underexcavation is commonly existed on the wall surface of the tunnel after the tunnel is excavated by the drilling and blasting method, and the wall surface of the tunnel is uneven. Meanwhile, the high-toughness energy-absorbing net has the characteristics of light weight and large flexibility. Therefore, in the laying process, the net material is difficult to be comprehensively and tightly attached with the uneven wall surface outline, and sagging or loosening is extremely easy to occur in the temporary fixing stage. In order to improve the laying quality of the high-toughness energy-absorbing net, a drum-type net laying device for a tunnel rock burst high-toughness energy-absorbing net is provided in the prior patent of the invention with publication number CN120739555B, and a mode of smoothly releasing the high-toughness energy-absorbing net through net feeding rollers and temporarily fixing the net by utilizing an elastic compression bar net pressing machine and a nail gun is disclosed. However, in subsequent developments, the inventors have found that there is still room for optimisation of the lapping apparatus of the previously issued patents, such as: 1) In the temporary fixing link after the net material is released smoothly, the elastic compression bar is deformed to adapt to wall surface fluctuation, so that not only is enough pressure difficult to be applied to a concave area to realize close fitting, but also the net material is prevented from being damaged due to overlarge pressure in a convex area, and therefore, the fitting quality has an optimization space; 2) The mode of fixing the net material by shooting nails is proposed in the prior patent, because the anchoring force of the shooting nail points is concentrated at the points, the large-area flexible net material is difficult to provide enough transverse constraint, on the premise of not excessively increasing the number of the anchoring points, the mode of concentrating the anchoring force at the points in the prior patent is difficult to constrain and restrain the sagging and the relaxation of the net material between the shooting nail points, and the existing attaching posture can not be maintained under the strong disturbance of the follow-up sprayed concrete. Therefore, whether the net is not pressed or sagging and loosening exist between the nail shooting points, gaps exist between the high-toughness energy absorbing net and the wall surface, the sprayed concrete slurry is difficult to fully fill and compact between the net material and the wall surface, and the integrity and the bearing capacity of the concrete layer are greatly reduced. Disclosure of Invention The invention aims to overcome the problems in the prior art, and provides a device and a method for attaching and temporarily fixing a high-toughness energy-absorbing net to a tunnel wall surface, which can enable the high-toughness energy-absorbing net to be always in a close attaching state with the tunnel wall surface in the lapping construction process. The invention provides a high-toughness energy-absorbing net-tunnel wall surface attaching and temporary fixing device, which comprises an attaching and pressing unit, a pressing driving rod, a rolling wheel and a pressure sensor, wherein the attaching and pressing unit is used for attaching the high-toughness energy-absorbing net to the tunnel wall surface; The temporary fixing device comprises a nail shooting gun and a nail gun used for shooting the nail, wherein the nail shooting gun comprises a nail rod and a sleeve sleeved outside the nail rod, a plurality of split grooves extending along the axial direction of the nail rod are formed in the side wall of the sleeve, and the sleeve moves towards the outer end part of the nail rod when the nail rod enters the wall surface, so that the side wall of the sleeve separated from the split grooves is used as a split body to be converted into a transverse retaining structure from a folded state parallel to the nail rod; The control unit is in signal connection with the pressure sensor, the compacti