Rock wall detection device for tunnel construction

Abstract

The invention provides a rock wall detection device for tunnel construction, and relates to the field of rock wall detection, the rock wall detection device comprises an upper plate, a lower plate and six-claw robots, the upper plate and the lower plate are vertically arranged at an interval, the six-claw robots are symmetrically arranged between the upper plate and the lower plate, the six-claw robots are open-source robots, and the middle parts of the upper plate and the lower plate are communicated; an equipment compartment is arranged between the upper plate and the lower plate, a follow-up assembly is arranged above the upper plate, the follow-up assembly comprises a follow-up shaft and magnetic boxes arrayed on the outer side of the follow-up shaft, the magnetic boxes are arc-shaped, and a repeater is arranged in an inner cavity of each magnetic box. The alternating current electromagnet is matched with the magnetic box and the rubber layer which are arranged on the outer side of the follow-up shaft in an array mode, so that the magnetic box and the rubber layer are separated from the follow-up shaft in a magnetic force increasing mode, the magnetic box and a repeater in the magnetic box are conveniently arranged at the corner of the tunnel, and the stability of signal transmission is improved.

Description

Technical Field

[0001] The present invention relates to the field of rock wall detection, and in particular to a rock wall detection device for tunnel construction. Background Art

[0002] It is of far-reaching significance to carry out rock wall inspection before the construction of high-speed railway tunnels. By accurately grasping key parameters such as the geological structure of the rock wall, rock strength and deformation characteristics, it can not only identify potential risks such as faults, cracks, and weak interlayers in advance and formulate targeted safety measures to ensure construction safety, but also provide a scientific basis for the design of support structures and the optimization of blasting parameters, avoid waste of resources and improve construction efficiency. At the same time, it can identify unfavorable geological bodies such as caves and gas and predict the deformation trend of rock masses to prevent secondary disasters. Ultimately, it provides a traceable compliance basis for project quality acceptance and achieves the goal of safe, economical and efficient construction. When the existing high-speed railway tunnels are rock wall inspected before construction, the space at the rock wall inspection site is small and long, and the tunnel will have certain turns. Therefore, during the inspection, the inspection equipment needs to be inserted deep into the rock wall. At this time, there is an unstable transmission of the detection signal during the inspection, and the detection sensor shakes during the inspection, resulting in inaccurate detection and affecting the detection results.

[0003] For example, the Chinese utility model patent (application number: CN202221122411.4) discloses a "rock wall detection device for tunnel construction". Its specification discloses: Tunnels are buildings built underground or underwater or in mountains to lay railways or build roads for motor vehicles to pass through. According to their location, they can be divided into three categories: mountain tunnels, underwater tunnels and urban tunnels. Before the construction of the tunnel project, the staff needs to test the hardness of the rock wall after construction to determine whether the rock wall is shale or other fragile rock with substandard hardness. At the same time, the small space at the rock wall detection site is not conducive to manual detection by the staff. In addition, the hardness of the rock wall at different heights needs to be tested; the above patents can prove the defects of the existing technology.

[0004] Therefore, we made improvements to this and proposed a rock wall detection device for tunnel construction. Summary of the invention

[0005] The purpose of the present invention is to carry out rock wall inspection before the construction of the existing high-speed railway tunnels. Since the space at the rock wall inspection site is small and long, and the tunnel also has certain turns, it is necessary to insert the inspection equipment into the rock wall during the inspection. At this time, the detection signal transmission is unstable during the inspection, and the detection sensor shakes during the inspection, resulting in inaccurate detection and affecting the detection results.

[0006] In order to achieve the above-mentioned purpose of the invention, the present invention provides a rock wall detection device for tunnel construction to improve the above-mentioned problem.

[0007] The present application is as follows: It includes an upper plate and a lower plate which are arranged at intervals up and down, and a six-jaw robot symmetrically arranged between the upper plate and the lower plate. The six-jaw robot is an open-source robot. The middle parts of the upper plate and the lower plate are both through-shaped. An equipment cabin is arranged between the upper plate and the lower plate. Inside the equipment cabin, a Velodyne VLP-16 3D lidar, a MALÅ ProEx ground penetrating radar, an ultrasonic array sensor, an FBG fiber Bragg grating strain sensor, a Sensirion SHT45 temperature and humidity sensor, a Figaro TGS2611 gas detection sensor, and an ADIS16470 inertial navigation are embedded. Above the upper plate, a follow-up component is arranged. The follow-up component includes a follow-up shaft and magnetic boxes arrayed outside the follow-up shaft. The magnetic boxes are arc-shaped, and a repeater is arranged inside the cavities of the magnetic boxes.

[0008] As a preferred technical solution of the present application, the follow-up component further includes partitions arrayed outside the follow-up shaft. The partitions and the magnetic boxes are distributed at intervals. Both sides of the magnetic boxes in contact with the partitions and the partitions are made of cermet. The friction coefficient of the cermet is 0.8.

[0009] As a preferred technical solution of the present application, a rubber layer is fixedly installed on the outer surface of the magnetic box, and the rubber layer is arc-shaped. The outer surface of the rubber layer is granular.

[0010] As a preferred technical solution of the present application, side plates are fixedly installed at both ends of the follow-up shaft. Connecting shafts extending outwards are sleeved outside both groups of side plates.

[0011] As a preferred technical solution of the present application, electric push rods are arranged at both ends of the follow-up shaft at intervals. The side wall of the telescopic end of the electric push rod is connected to one end of the connecting shaft. The fixed end of the electric push rod penetrates through the upper plate and extends to the top of the lower plate.

[0012] As a preferred technical solution of the present application, an alternating current electromagnet is arranged in the middle of the lower plate. An inner groove is opened on the inner side of the lower plate. Elastic pieces are arrayed outside the alternating current electromagnet. The elastic pieces penetrate through the inner groove and are connected to the inner side of the lower plate.

[0013] As a preferred technical solution of the present application, a permanent magnet is arranged in the middle of the upper plate. An inner groove is opened on the inner side of the upper plate. Elastic pieces are arrayed outside the permanent magnet. The elastic pieces penetrate through the inner groove and are fixedly connected to the inner side of the upper plate.

[0014] As a preferred technical solution of the present application, a mounting plate is fixedly installed outside the equipment cabin. Spring telescopic rods are arrayed at both the upper and lower ends of the mounting plate. Both ends of the spring telescopic rods are spherical.

[0015] As the preferred technical solution of the present application, the two ends of the spring telescopic rod located at the top are spherically socketed with the lower surface of the permanent magnet and the upper surface of the mounting plate respectively, and the two ends of the spring telescopic rod located at the bottom are spherically socketed with the lower surface of the mounting plate and the upper surface of the AC electromagnet respectively.

[0016] As a preferred technical solution of the present application, the bottom array of the lower plate is provided with bottom rods, and the gap between the bottom rods is the same as the width of the middle part of the magnetic box.

[0017] Compared with the prior art, the present invention has the following beneficial effects: In the scheme of this application: 1. In order to solve the problem in the prior art that the space at the rock wall detection location is narrow and long, and the tunnel also has a certain turn, it is necessary to insert the detection equipment deep into the rock wall during detection, and there is a problem of unstable detection signal transmission during detection. The present application realizes that the magnetic box and the rubber layer are separated from the follower shaft by increasing the magnetic force through the AC electromagnet set in conjunction with the magnetic box and the rubber layer set in the array outside the follower shaft, thereby facilitating the placement of the magnetic box at the corner of the tunnel, so as to realize the deployment of the repeater inside the magnetic box, thereby increasing the stability of signal transmission; 2. In order to solve the problem in the prior art that the detection sensor shakes during detection, resulting in inaccurate detection, the present application sets a mounting plate on the outside of the equipment cabin, and uses spring telescopic rods arrayed at the upper and lower ends of the mounting plate to facilitate buffering when the six-claw robot encounters vibrations during movement, thereby ensuring that the equipment cabin and the sensors embedded in its inner cavity are relatively stable, and by respectively setting permanent magnets and AC electromagnets above and below the equipment cabin, the equipment cabin is suspended by magnetic levitation, thereby increasing the stability of detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of the structure of the rock wall detection device for tunnel construction provided in this application; Figure 2 A bottom view of the structure of the rock wall detection device for tunnel construction provided in this application; Figure 3 A structural cross-sectional view of a rock wall detection device for tunnel construction provided in this application; Figure 4 An exploded diagram of the connection structure of the follower assembly of the rock wall detection device for tunnel construction provided in this application; Figure 5 A cross-sectional view of the connection structure of the upper plate of the rock wall detection device for tunnel construction provided in this application; Figure 6 A schematic diagram of the connection structure of the mounting plate of the rock wall detection device for tunnel construction provided in this application; Figure 7 Schematic diagram of the magnetic force directions of the alternating current electromagnet, permanent magnet, and magnetic box of the rock wall detection device for tunnel construction provided by this application.

[0019] Marked in the figure: 1. Six-claw robot; 2. Lower plate; 3. Upper plate; 4. Alternating current electromagnet; 5. Shrapnel; 6. Permanent magnet; 7. Follow-up component; 701. Follow-up shaft; 702. Side plate; 703. Connecting shaft; 704. Partition board; 705. Magnetic box; 706. Rubber layer; 8. Electric push rod; 9. Inner groove; 10. Mounting plate; 11. Equipment cabin; 12. Spring telescopic rod; 13. Bottom rod. Specific implementation manners

[0020] In order to enable those skilled in the art to better understand the solution of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0021] As described in the background art, when detecting the rock wall before the construction of the existing high-speed rail tunnel, since the space for rock wall detection is narrow and long, and the tunnel also has a certain turning, during the detection, it is necessary to insert the detection equipment deep into the rock wall. At this time, there are problems such as unstable detection signal transmission during the detection, and shaking during the detection of the detection sensor, resulting in inaccurate detection, which affects the detection result.

[0022] To solve this technical problem, the present invention provides a rock wall detection device for tunnel construction, which is applied to signal-enhanced integrated rock wall detection.

[0023] Specifically, please refer to Figures 1-7, the rock wall detection device for tunnel construction specifically includes an upper plate 3 and a lower plate 2 arranged at intervals up and down, and a six-claw robot 1 symmetrically arranged between the upper plate 3 and the lower plate 2. The six-claw robot 1 is an open-source robot. The middle parts of the upper plate 3 and the lower plate 2 are both through. An equipment cabin 11 is arranged between the upper plate 3 and the lower plate 2. Inside the equipment cabin 11, a Velodyne VLP-16 3D lidar, a MALÅ ProEx ground penetrating radar, an ultrasonic array sensor, an FBG fiber Bragg grating strain sensor, a Sensirion SHT45 temperature and humidity sensor, a Figaro TGS2611 gas detection sensor, and an ADIS16470 inertial navigation are embedded. Above the upper plate 3, a follow-up component 7 is arranged. The follow-up component 7 includes a follow-up shaft 701 and magnetic boxes 705 arrayed outside the follow-up shaft 701. The magnetic boxes 705 are arc-shaped, and a repeater is arranged in the inner cavity of the magnetic boxes 705; As shown in the appendix Figure 7 , the arrayed six-foot magnetic boxes 705 correspond to each other in pairs and are divided into three groups. Each time the magnetic boxes 705 are symmetrically distributed, and the magnetic forces at both ends attract each other. The magnetic forces outside each adjacent two groups of magnetic boxes 705 are opposite.

[0024] For the rock wall detection device for tunnel construction provided by the present invention, by setting the alternating current electromagnet in cooperation with the magnetic boxes and the rubber layer arrayed outside the follow-up shaft, it is realized that the magnetic boxes and the rubber layer are separated from the follow-up shaft by increasing the magnetic force, thereby facilitating the placement of the magnetic boxes and the repeaters inside the magnetic boxes at the corners of the tunnel, and thus increasing the stability of signal transmission.

[0025] In order to enable those skilled in the art to better understand the solution of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0026] It should be noted that, without conflict, the embodiments in the present invention and the features and technical solutions in the embodiments can be combined with each other.

[0027] It should be noted that similar reference numerals and letters indicate similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0028] Example 1, please refer to Figure 3 And Figure 4 , a rock wall detection device for tunnel construction, the follow-up component 7 of which further includes partitions 704 arrayed outside the follow-up shaft 701. The partitions 704 and the magnetic boxes 705 are distributed at intervals. Both sides of the magnetic boxes 705 in contact with the partitions 704 and the partitions 704 are made of cermet material, and the friction coefficient of the cermet material is 0.8; The outer surface of the magnetic cassette 705 is fixedly installed with a rubber layer 706, and the rubber layer 706 is arc-shaped, and the outer surface of the rubber layer 706 is granular; Both ends of the follower shaft 701 are fixedly installed with side plates 702, and connecting shafts 703 extending outward are sleeved on the outer sides of the two groups of side plates 702; Electric push rods 8 are arranged at both ends of the follower shaft 701 at intervals. The side wall of the telescopic end of the electric push rod 8 is connected to one end of the connecting shaft 703, and the fixed end of the electric push rod 8 penetrates through the upper plate 3 and extends to the top of the lower plate 2.

[0029] Through the symmetrically arranged magnetic cassettes 705 in pairs, and by using the suction force between the magnetic cassettes 705 and the frictional force between the two sides of the magnetic cassette 705 and the partition 704, it is convenient to adsorb the magnetic cassette 705 on the outside of the follower shaft 701. At the same time, the rubber layer 706 fixedly installed on the outside of the magnetic cassette 705 can also buffer and protect when the magnetic cassette 705 rotates with the follower shaft 701.

[0030] Please refer to Figure 5 , a rock wall detection device for tunnel construction. An alternating current electromagnet 4 is arranged in the middle of the lower plate 2. An inner groove 9 is opened on the inner side of the lower plate 2. Elastic sheets 5 are arranged in an array on the outside of the alternating current electromagnet 4. The elastic sheets 5 penetrate through the inner groove 9 and are connected to the inner side of the lower plate 2.

[0031] A permanent magnet 6 is arranged in the middle of the upper plate 3. An inner groove 9 is opened on the inner side of the upper plate 3. Elastic sheets 5 are arranged in an array on the outside of the permanent magnet 6. The elastic sheets 5 penetrate through the inner groove 9 and are fixedly connected to the inner side of the upper plate 3.

[0032] As shown in the appendix Figure 7 , the magnetic force direction of the permanent magnet 6 is fixed, and it repels the D-shaped magnetic cassette 705 and repels the A-shaped magnetic cassette 705. However, since the A-shaped magnetic cassette 705 is in contact with the tunnel inner wall, and the repulsive force generated by the permanent magnet 6 is less than the weight of the A-shaped magnetic cassette 705, the A-shaped magnetic cassette can be prevented from detaching under the action of the permanent magnet.

[0033] Example 2 further optimizes the rock wall detection device for tunnel construction provided in Example 1. Specifically, as Figure 6 shown, a mounting plate 10 is fixedly installed on the outside of the equipment cabin 11. Spring telescopic rods 12 are arranged in an array at both the upper and lower ends of the mounting plate 10. Both ends of the spring telescopic rods 12 are spherical.

[0034] The two ends of the spring telescopic rod 12 located above are respectively spherical socketed with the lower surface of the permanent magnet 6 and the upper surface of the mounting plate 10, and the two ends of the spring telescopic rod 12 located below are respectively spherical socketed with the lower surface of the mounting plate 10 and the upper surface of the alternating current electromagnet 4.

[0035] The bottom of the lower plate 2 is provided with a bottom rod 13 in an array, and the gap between the bottom rods 13 is the same as the width of the middle part of the magnetic cassette 705.

[0036] The spring telescopic rods 12 arranged in an array cooperate with the mounting plate 10 to facilitate buffering the device when it is vibrated, avoiding damage to signal transmission. The bottom rods 13 arranged in an array facilitate buffering the lower plate 2 during movement, and can also be used to limit the magnetic cassette 705 when it is recycled.

[0037] The use process of the rock wall detection device for tunnel construction provided by the present invention is as follows: First, take out the device and place it at the entrance of the tunnel. At this time, the electric push rod 8 can be selectively started. The electric push rod 8 drives the follower assembly 7 to move until the rubber layer 706 on the outside of the follower assembly 7 contacts the inner wall of the tunnel. At this time, the six-jaw robot can drive the device to move into the tunnel. During the movement, the six-jaw robot 1 can also move horizontally through the limitation of the follower assembly 7. If the tunnel is circular, it is also convenient for the device to be tilted or even inverted. At the same time, start the AC electromagnet 4 so that its magnetic pole direction is as shown in the appendix Figure 7 As shown. At this time, the AC electromagnet 4 cooperates with the permanent magnet 6 to make the equipment cabin 11 and the mounting plate 10 float between the upper plate 3 and the lower plate 2, thereby reducing the fluctuation of the equipment cabin 11 caused by shaking and inversion during movement and affecting the stability of data transmission. At this time, the repulsive force F_electric generated by the AC electromagnet 4 and the repulsive force F_permanent generated by the permanent magnet 6 are equal to the weight G1 of the equipment cabin 11 plus the mounting plate 10, that is: F_electric + F_permanent = G1; and in this state, referring to the appendix Figure 7 As shown, the magnetic cassettes 705 arranged in an array are symmetrically distributed in pairs. At the same time, the outer magnetic poles attract each other, and the metal ceramic materials on both sides thereof contact the partition plate 704 to increase the friction force, so that the magnetic cassettes 705 arranged in an array can surround the outside of the follower shaft 701; During movement, the six-jaw robot 1 continuously drives the device to move. Since the follower assembly 7 contacts the inner wall of the tunnel, during the movement, the magnetic cassette 705 and the follower shaft 701 will also be driven to rotate synchronously under the friction force of the rubber layer 706. As the six-jaw robot 1 continuously moves, the equipment cabin 11 arranged in the middle continuously collects data in the rock wall and continuously transmits it to the outside. If there is a collision or a rock in the tunnel falls off and impacts during the movement, causing the upper plate 3 and the lower plate 2 to vibrate, first, the deformation and displacement of the elastic pieces 5 arranged outside the AC electromagnet 4 and the permanent magnet 6 are used to offset the lateral impact. At the same time, the spring telescopic rods 12 arranged at the upper and lower ends of the mounting plate 10 are correspondingly telescoped to achieve secondary buffering, avoiding the shaking of the equipment cabin 11 caused by the impact and thus affecting the stability of data transmission; When moving to the corner, the six-claw robot 1 drives the device to move, and the follower shaft 701 drives the magnetic box 705 and the rubber layer 706 to follow until before and after the corner, the magnetic box 705 moves to the position as shown in the appendix Figure 7 As shown. At this time, by changing the pole direction of the AC electromagnet 4 and its electromagnetic intensity, the magnetic force exerted by the AC electromagnet 4 on the No. A magnetic box 705 is increased and converted into a repulsive force. As the magnetic force of the AC electromagnet 4 continuously increases, the No. A magnetic box 705 will slowly separate from the follower shaft 701 under the action of the magnetic force of the AC electromagnet 4. At this time, the magnetic force F_electric + F_permanent exerted by the AC electromagnet 4 and the permanent magnet 6 on the No. A magnetic box 705 is greater than the sum of the gravity G2 of the No. A magnetic box 705 and the rubber layer 706, and the magnetic force F_electric + F_permanent generated by this AC electromagnet 4 also needs to be less than G2 plus the friction force f between the magnetic box 705 and the partition 704. This friction force can be expressed as f = μ·N·cosθ, where μ is the friction coefficient, that is, 0.8, N is the normal force, that is, G1·tan60 ° , θ is 60 ° , and the overall magnetic force range of the AC electromagnet is: G2 < F_electric + F_permanent < G2 + f, so as to ensure that under the action of the magnetic force of the AC electromagnet 4, the No. A magnetic box 705 is separated, but the No. B magnetic box 705 and the No. C magnetic box 705 are not separated; When the No. A magnetic box 705 moves upward under the action of the magnetic force of the AC electromagnet 4 and separates from it, then the six-claw robot 1 is started at this time to make the device continue to move forward. At this time, the No. A magnetic box 705 will fall at the corner of the tunnel as the magnetic force continuously weakens, so as to ensure the normal signal transmission through the repeater arranged in the inner cavity of the magnetic box 705. Repeat the above steps continuously until the detection is completed; At this time, the six-claw robot 1 drives the device to return. During the return process, the AC electromagnet 4 always generates magnetic force. When the six-claw robot 1 moves to the top of the scattered magnetic box 705, it will adsorb the magnetic box 705 under the action of the magnetic force, and then realize the recovery. The adsorbed magnetic box 705 adheres to the gap between the bottom rods 13. Repeat this process until all the magnetic boxes 705 are recovered and return to the tunnel entrance through the six-claw robot 1.

[0038] In the present invention, unless otherwise clearly specified and limited, terms such as "installation", "connection", "connection", "fixation" and other terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection, an electrical connection or communication with each other; it can be directly connected, or indirectly connected through an intermediate medium, and can be the internal communication of two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0039] Obviously, the embodiments described above are only a part of the embodiments of the present invention, rather than all of the embodiments. The preferred embodiments of the present invention are given in the accompanying drawings, but do not limit the patent scope of the present invention. The present invention can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosed content of the present invention more thorough and comprehensive. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing specific embodiments, or perform equivalent replacements on some of the technical features. Any equivalent structure that makes use of the content of the specification and drawings of the present invention, directly or indirectly applied in other related technical fields, is equally within the scope of the patent protection of the present invention.

Claims

1. A rock wall detection device for tunnel construction, characterized in that: The invention comprises an upper plate (3) and a lower plate (2) which are arranged at an interval from top to bottom, and a six-claw robot (1) which is symmetrically arranged between the upper plate (3) and the lower plate (2); the six-claw robot (1) is an open source robot; an equipment cabin (11) is arranged between the upper plate (3) and the lower plate (2); a follower assembly (7) is arranged above the upper plate (3); the follower assembly (7) comprises a follower shaft (701) and a magnetic box (705) arranged on the outside of the follower shaft (701); a repeater is arranged in the inner cavity of the magnetic box (705).

2. A rock wall detection device for tunnel construction according to claim 1, characterized in that: The follower assembly (7) further comprises partitions (704) arranged in an array outside the follower shaft (701), the partitions (704) and the magnetic boxes (705) being spaced apart, and both sides of the magnetic boxes (705) in contact with the partitions (704) and the partitions (704) are made of metal ceramic material.

3. A rock wall detection device for tunnel construction according to claim 2, characterized in that: A rubber layer (706) is fixedly mounted on the outer surface of the magnetic box (705), and the rubber layer (706) is arc-shaped, and the outer surface of the rubber layer (706) is granular.

4. A rock wall detection device for tunnel construction according to claim 3, characterized in that: Side plates (702) are fixedly mounted on both ends of the follower shaft (701), and connecting shafts (703) extending outwards are sleeved on the outer sides of the two sets of side plates (702).

5. A rock wall detection device for tunnel construction according to claim 4, characterized in that: Electric push rods (8) are arranged at intervals at both ends of the follower shaft (701); the side wall of the telescopic end of the electric push rod (8) is connected to one end of the connecting shaft (703); and the fixed end of the electric push rod (8) passes through the upper plate (3) and extends to the top of the lower plate (2).

6. A rock wall detection device for tunnel construction according to claim 5, characterized in that: An AC electromagnet (4) is arranged in the middle of the lower plate (2), an inner groove (9) is provided on the inner side of the lower plate (2), and spring pieces (5) are installed in an array on the outer side of the AC electromagnet (4), wherein the spring pieces (5) penetrate the inner groove (9) and are connected to the inner side of the lower plate (2).

7. A rock wall detection device for tunnel construction according to claim 6, characterized in that: A permanent magnet (6) is arranged in the middle of the upper plate (3), an inner groove (9) is provided on the inner side of the upper plate (3), and spring sheets (5) are arranged in an array on the outer side of the permanent magnet (6), and the spring sheets (5) penetrate the inner groove (9) and are fixedly connected to the inner side of the upper plate (3).

8. A rock wall detection device for tunnel construction according to claim 7, characterized in that: A mounting plate (10) is fixedly mounted on the outside of the equipment cabin (11), and spring telescopic rods (12) are arranged in an array at both upper and lower ends of the mounting plate (10), and both ends of the spring telescopic rods (12) are spherical.

9. A rock wall detection device for tunnel construction according to claim 8, characterized in that: The two ends of the spring telescopic rod (12) located at the top are spherically sleeved with the lower surface of the permanent magnet (6) and the upper surface of the mounting plate (10), respectively, and the two ends of the spring telescopic rod (12) located at the bottom are spherically sleeved with the lower surface of the mounting plate (10) and the upper surface of the AC electromagnet (4), respectively.

10. A rock wall detection device for tunnel construction according to claim 9, characterized in that: The bottom array of the lower plate (2) is provided with bottom bars (13), and the gap between the bottom bars (13) is the same as the width of the middle part of the magnetic box (705).

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