A tunnel lining inspection apparatus

Abstract

The application provides a tunnel lining detection device, belonging to the technical field of tunnel detection. The device comprises a mounting frame, a guide mechanism, a driving part, a detection assembly and a locking mechanism. The guide mechanism comprises two movable columns slidingly arranged on the top of the mounting frame, the bottom surface of the movable column is connected with a guide rod slidingly arranged on the bottom of the mounting frame, and the guide rod is provided with a first spring. The upper end of the movable column is rotatably connected with a strip-shaped plate, the strip-shaped plate is provided with a roller, and a spring sheet is arranged between the movable column and the strip-shaped plate. The driving part comprises a pair of push rods vertically and slidingly arranged on the top of the mounting frame. A linear mechanism is arranged in the mounting frame. The detection assembly comprises a mounting box arranged on the upper end of the push rod, and an antenna box is arranged in the mounting box. A third spring is arranged between the antenna box and the mounting box. The locking mechanism is arranged on the top of the mounting frame. A telescopic support arm is arranged on the moving platform, the lower end of the telescopic support arm is connected with the moving platform through a movable joint, and the upper end of the telescopic support arm is connected with the mounting frame. The device can guide the stroke of the antenna and improve the accuracy of the detection result.

Description

Technical Field

[0001] This application belongs to the field of tunnel inspection technology, and in particular relates to a tunnel lining inspection device. Background Technology

[0002] The tunnel lining is a permanent support layer constructed on the inner wall after tunnel excavation, typically composed of reinforced concrete. The main functions of the lining include resisting surrounding rock pressure, preventing collapse, and blocking groundwater seepage into the tunnel. After prolonged use, the tunnel lining may develop several risks, such as internal cracking, voids behind the lining, and separation of the waterproofing layer from the lining. Regular inspection and repair of the lining are necessary to ensure it remains in good condition, prevent accidents, and extend the tunnel's service life.

[0003] The current mainstream inspection method uses ground-penetrating radar (GPR) to scan along the lining line, which is laid out along the length of the tunnel. During inspection, a lifting rod is installed on a movable platform to support the GPR antenna against the lining line. Inspectors then push the platform to move the antenna along the lining line to complete the scan. However, this method has limitations. For example, the antenna is only supported by the lifting rod on the lining line; there is no dedicated conductor structure to guide the antenna's movement, causing the antenna to deviate from the lining line and affecting the accuracy of the inspection results. Summary of the Invention

[0004] To address the shortcomings of the prior art, this application provides a tunnel lining inspection device that can guide the travel of the antenna, thereby improving the accuracy of the inspection results.

[0005] To achieve the above objectives, the present invention employs the following techniques:

[0006] A tunnel lining inspection device, comprising:

[0007] The mounting frame is rectangular.

[0008] The guiding mechanism includes two vertical movable columns that slide through the top of the mounting frame. A guide rod, sliding through the bottom of the mounting frame, is connected to the bottom of each column in the same direction. A first spring is provided on the guide rod for elastic support of the movable columns. A strip plate is rotatably connected to the upper end of each movable column. The rotation axes of the two strip plates are parallel to each other and both are parallel to the top of the mounting frame. Rollers are mounted on the strip plates in the same direction, and the axes of the two rollers are coplanar with the axis of the guide rod. A spring plate is provided between the upper end of the movable column and the corresponding strip plate to elastically support the strip plate so that it is perpendicular to the movable column.

[0009] The drive unit includes a pair of push rods located in the middle of the two movable columns and slidably passing through the top of the mounting frame; a linear mechanism is provided inside the mounting frame to drive the two push rods to move synchronously.

[0010] The detection assembly includes a mounting box located at the top of the push rod, with its top surface facing the top of the mounting frame and being open; an antenna box is located inside the mounting box; a third spring is provided between the antenna box and the mounting box to prop the detection surface of the antenna box out of the top surface of the mounting box.

[0011] A locking mechanism, located at the top of the mounting frame, is used to release the strip plate and movable column when the mounting box is a predetermined distance from the top of the mounting frame; and to fix the strip plate and movable column when the push rod pushes the mounting box away from the top of the mounting frame.

[0012] The mobile platform is equipped with a telescopic support arm. The lower end of the telescopic support arm is connected to the top surface of the mobile platform via a movable joint. The movable joint is used to support the rotation of the telescopic support arm about a direction perpendicular to the axis of the mobile platform and to adjust its pitch angle. The upper end of the telescopic support arm is connected to the bottom of the mounting frame.

[0013] The beneficial effects of this invention are as follows:

[0014] By cooperating with the tunnel surface, the concave surface of the tunnel provides lateral constraint to the roller. The roller has a large axial length, and the contact line formed by its cooperation with the tunnel inner wall surface is longer, which requires a larger torque to change the rolling direction. Therefore, it can effectively maintain itself to roll in a straight line and better resist the side slip or directional deviation that occurs during rolling. The guiding effect of the roller allows the detection surface of the antenna box to move along the liner, which effectively improves the stability of the antenna box movement and effectively solves the problem that the antenna box cannot move along the liner during lining detection, thus improving the accuracy of ground-penetrating radar detection. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the main structure of the device in the embodiment of this application.

[0016] Figure 2 This is a schematic diagram of the installation frame in an embodiment of this application.

[0017] Figure 3 This is a cross-sectional view of the installation frame in an embodiment of this application.

[0018] Figure 4 yes Figure 3 A magnified view of part A in the middle.

[0019] Figure 5 yes Figure 3 A magnified view of part B in the middle.

[0020] Figure 6 This is a schematic diagram of the structure of the movable column in an embodiment of this application.

[0021] Figure 7 yes Figure 6 A magnified view of a portion of C.

[0022] Figure 8 yes Figure 6 A magnified view of a portion of D.

[0023] Figure 9 This is a schematic diagram of the top and bottom of the mounting frame in an embodiment of this application.

[0024] Figure 10 This is a schematic diagram of the installation box in an embodiment of this application.

[0025] Figure 11 This is a schematic diagram of the structure of the arc track in an embodiment of this application.

[0026] Figure 12 yes Figure 11 A magnified view of part E in the middle.

[0027] Reference numerals: 1-Mounting frame, 11-Bracket, 12-Rotating shaft, 13-First gear, 2-Guide mechanism, 21-Moving column, 22-Guide rod, 23-First spring, 24-Strip plate, 25-Roller, 26-Spring plate, 27-Slider, 28-Connecting rod, 29-Rack, 3-Drive unit, 31-Push rod, 311-Second mating block, 32-Linear mechanism, 4-Detection component, 41-Mounting box, 42-Antenna box, 43-Third spring, 44-First mating block, 45-Arc strip, 46-Rotary cylinder, 47 - Stop bar, 48 - Slide plate, 5 - Locking mechanism, 51 - Column, 511 - First support plate, 52 - First clamping plate, 53 - Top rod, 531 - Mounting head, 532 - Second spring, 54 - Mounting rod, 541 - Second support plate, 55 - Movable plate, 56 - Second clamping plate, 57 - Mating plate, 58 - Fourth spring, 6 - Moving platform, 61 - Telescopic support arm, 62 - Movable joint, 7 - Arc track, 71 - Arc hole, 8 - Adjustment part, 81 - Incomplete gear ring, 82 - Support plate, 83 - Motor, 84 - Second gear. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the implementation methods of the present invention will be described in detail below with reference to the accompanying drawings. However, the embodiments described in this invention are only some embodiments of the present invention, and not all embodiments.

[0029] Example 1

[0030] This application provides a tunnel lining testing device, such as... Figures 1-6 As shown, it includes a mounting frame 1, a guide mechanism 2, a drive unit 3, a detection component 4, a locking mechanism 5, and a moving platform 6.

[0031] Among them, such as Figures 1-6As shown, the mounting frame 1 is rectangular; the guide mechanism 2 includes two vertically slidably inserted movable columns 21 on the top of the mounting frame 1. The two movable columns 21 are arranged along the length of the top of the mounting frame 1. The bottom surfaces of the movable columns 21 are connected in the same direction to guide rods 22 that slide through the bottom of the mounting frame 1. A first spring 23 is sleeved on the guide rod 22, which connects the bottom surface of the corresponding movable column 21 to the bottom of the mounting frame 1, and is used to elastically support the movable column 21. The upper ends of both movable columns 21 are rotatably connected to one end of a strip plate 24. The rotation axes corresponding to the plate 24 are all arranged in the direction of the top width of the mounting frame 1. The two ends of the strip plate 24 are provided with mounting brackets for mounting the rollers 25 in the same direction. The rollers 25 are arranged to rotate around their own axes. The axes of the two rollers 25 are coplanar with the axis of the guide rod 22. A spring plate 26 is provided between the upper side of the movable column 21 and the bottom surface of one end of the corresponding strip plate 24. When the spring plate 26 is in its natural state, the strip plate 24 is perpendicular to the movable column 21. The elastic coefficient of the spring plate 26 is less than the elastic coefficient of the first spring 23.

[0032] like Figures 1-3 As shown, the drive unit 3 includes a pair of push rods 31 located in the middle of the two movable columns 21, and vertically and slidably passing through the top of the mounting frame 1. The two push rods 31 are arranged along the length of the top of the mounting frame 1. The lower ends of the two push rods 31 are connected by a connecting plate parallel to the top of the mounting frame 1. A linear mechanism 32 is provided at the bottom of the top of the mounting frame 1 between the two push rods 31. Its movable end faces vertically toward the bottom of the mounting frame 1 and is connected to the connecting plate. The linear mechanism 32 can be a linear cylinder, hydraulic cylinder, etc. Figures 1-4 As shown, the detection component 4 includes a mounting box 41 located at the upper end of the push rod 31. The mounting box 41 is rectangular, with its body facing the top width of the mounting frame 1. The top surface of the mounting box 41 faces the top of the mounting frame 1 and is open. Inside the mounting box 41 is a rectangular antenna box 42. A third spring 43 is provided between the four corners of the bottom surface of the antenna box 42 and the bottom surface of the mounting box 41, which is used to prop the detection surface of the antenna box 42 out of the top surface of the mounting box 41.

[0033] like Figure 2 , Figure 5 , Figure 8 , Figure 9 As shown, the locking mechanism 5 is located at the top of the mounting frame 1, used to release the strip plate 24 and the movable column 21 when the mounting box 41 is a predetermined distance from the top of the mounting frame 1; and to fix the strip plate 24 and the movable column 21 when the push rod 31 pushes the mounting box 41 away from the top of the mounting frame 1. Figure 1As shown, the mobile platform 6 is equipped with a telescopic support arm 61. The lower end of the telescopic support arm 61 is connected to the top surface of the mobile platform 6 via a movable joint 62. The movable joint 62 is used to support the rotation of the telescopic support arm 61 around an axis perpendicular to the mobile platform 6 and to adjust its pitch angle. The upper end of the telescopic support arm 61, i.e., the telescopic end, is connected to the bottom of the mounting frame 1. The telescopic support arm 61 is located in the same direction at the center of the two movable columns 21. Specifically, a pickup truck with a single-row braking body, a cargo box size of not less than two meters, and a tare weight of not less than two tons can be used as the mobile platform 6. The single-row braking structure reduces the production cost of the testing equipment while meeting the testing requirements, and the larger cargo box size and greater tare weight can ensure the stability of on-site testing. Figure 1 As shown, the telescopic support arm 61 is installed on the cargo box of the pickup truck. Specifically, the flange can be firmly installed on the bottom surface of the cargo box using bolts. A movable joint 62 is set on the upper part of the flange. The movable joint 62 is connected to the lower end of the telescopic support arm 61. The movable joint 62 adopts a ball joint structure or neutral bearing to ensure flexibility while bearing a large load. It is driven by a hydraulic motor or electric motor. The telescopic support arm 61 is composed of multiple nested arm segments and is pushed to extend and retract by built-in hydraulic cylinders.

[0034] In application, the wheels of the pickup truck, which serves as the mobile platform 6, are replaced with rail wheels. Through the cooperation of the rail wheels and the rails on the tunnel surface, the pickup truck can be positioned in the middle of the straight tunnel surface and travel along the length of the rails. The inspector adjusts the telescopic support arm 61 to be parallel to the tunnel cross-section by operating the control lever or control button in the cab. Here, the inspection of the liner at the transition area between the arch waist and the side wall of the horseshoe-shaped tunnel is used as an example. The curvature of the two curved surfaces of the liner is inconsistent. The inspector continues to adjust the telescopic support arm 61, aligning its upper end laterally with the liner at the arch waist. The extension lines of the axes of the two guide rods 22 are located on both sides of the liner to be inspected, and the plane formed by the axes of the two guide rods 22 is perpendicular to the liner. The mounting box 41 is arranged facing the length of the liner. The mounting box 41 is a predetermined distance from the top of the mounting frame 1. At this time, the strip plate 24 is in a rotatable state, and the movable column 21 is in a sliding state.

[0035] like Figures 1-6As shown, the inspector then manipulates the telescopic support arm 61 to extend towards the serif to be inspected. Due to the inconsistent slopes of the curved surfaces on both sides of the serif to be inspected, when the telescopic support arm 61 extends, the far ends of the two rollers 25, i.e., the ends furthest from the movable column 21, will successively abut against the curved surfaces on both sides of the serif to be inspected. The far end of the roller 25 located on the curved surface with greater curvature abuts first. As the telescopic support arm 61 continues to extend, the roller 25 located on the curved surface with greater curvature begins to resist the elastic rotation of the spring plate 26 to its proximal end, i.e., the end closest to the movable column 21 abuts against the curved surface with greater curvature, until both ends of the roller 25 located on the curved surface with greater curvature abut against the corresponding curved surface. At this time, the two ends of the roller 25 located on the curved surface with less curvature may be in a state where only the far ends abut or neither end abuts. The inspector continues to extend the telescopic support arm 61. Since the two ends of the roller 25 located on the side of the curved surface with greater curvature are already in abutting state, and under the action of the spring plate 26, the two ends of the roller 25 remain in abutting state, while the corresponding movable column 21 retracts, thereby compressing the first spring 23. Here, retraction means that the abutting action of the two ends of the roller 25 located on the side of the curved surface with greater curvature keeps the corresponding movable column 21 stationary. Driven by the telescopic support arm 61, the mounting frame 1 moves closer to the serif, causing the movable column 21 to retract. As the movable column 21 corresponding to the roller 25 located on the side of the curved surface with greater curvature retracts, the proximal end or both ends of the roller 25 located on the side of the curved surface with less curvature begin to move closer to the corresponding curved surface until both ends of the roller 25 are abutting the curved surface with less curvature.

[0036] like Figures 1-6As shown, the inspector extends the telescopic support arm 61 until both ends of the two rollers 25 abut against the corresponding curved surfaces, the movable joint 62 locks, and the hydraulic cylinder built into the telescopic support arm 61 locks, so that the rollers 25 and the mounting frame 1 remain in their current positions; then the linear mechanism 32 retracts, driving the push rod 31 to extend, so that the detection surface of the antenna box 42 abuts against the serif, and the third spring 43 is compressed. The detection surface of the antenna box 42 is tightly pressed against the serif under the support of the third spring 43; at the same time as the linear mechanism 32 retracts, the locking mechanism 5 fixes the strip plate 24 and the movable column 21; then, through the cooperation of the rail wheel and the steel rail on the tunnel surface, the inspector can drive the pickup truck along the length of the steel rail, with the two rollers 25 abutting against each other. As the roller 25 rolls along the length of the tunnel along the corresponding curved surface, the concave curved surface of the tunnel provides lateral constraint to the roller 25 during its rolling process. Compared to the guide wheel, the roller 25 has a larger axial length and a longer contact line formed by its interaction with the curved surface of the tunnel wall. This requires a larger torque to change the rolling direction, thus effectively maintaining its own straight-line rolling and better resisting lateral slippage or directional deviation during rolling. The guiding effect generated by the interaction between the roller 25 and the tunnel curved surface allows the detection surface of the antenna box 42 to move along the serration, effectively improving the stability of the antenna box 42's movement and effectively solving the problem that the antenna box 42 cannot move along the serration during lining detection, thereby improving the accuracy of ground-penetrating radar detection.

[0037] After the inspection is completed, the inspector manipulates the telescopic support arm 61 to retract, causing the roller 25 to separate from the curved surface, and manipulates the linear mechanism 32 to extend, driving the mounting box 41 back to a predetermined length from the top of the mounting frame 1. The locking mechanism 5 releases the strip plate 24 and the movable column 21. Under the action of the spring plate 26, the strip plate 24 returns to a state perpendicular to the movable column 21, and the movable column 21 returns to its initial state under the action of the first spring 23, ready for the next lining inspection.

[0038] Specifically, the two ends of the roller 25 can be set to be conical, similar to the conical tread of a train wheelset. When rolling on the curved surface, it can automatically generate centripetal force, reduce slippage, and achieve self-guidance.

[0039] Specifically, the surface of the roller 25 that mates with the tunnel surface is provided with an elastic material, such as a rubber coating, to accommodate some minor protrusions on the arm surface and prevent lateral slippage.

[0040] Specifically, such as Figure 2 and Figure 3 As shown, the detection surface of the antenna box 42 is provided with a sliding plate 48, which has good wear resistance. During use, the sliding plate 48 is in close contact with the serration to ensure the service life of the antenna box 42.

[0041] Preferably, since the environment inside the tunnel is dark, a real-time 360° panoramic camera and searchlight can be installed on the pickup truck, which serves as the mobile platform 6, to provide real-time road conditions and assist the inspection personnel in driving the vehicle.

[0042] Preferably, the pickup truck cab can be modified to include mechanical buttons below the onboard display screen, which can also be operated by touch. The display screen is divided into two parts: one part displays a 360° panoramic view of the vehicle and the radar antenna, and the other part contains mechanical or touch buttons for adjusting the positions of the control arms and antenna. A slot can be installed in the upper part in front of the passenger seat to house the radar unit or other equipment.

[0043] Preferably, a hydraulic adjustment structure can be installed between the first section of the telescopic support arm 61 and the bottom of the pickup truck cargo box. The structure consists of 2 to 3 hydraulic cylinders arranged in a triangular layout, which can effectively suppress the bending deformation of the telescopic support arm 61 caused by long-term extension or increased load, improve the stability of the overall stroke, and, in conjunction with the movable joint 62, achieve fine adjustment of the pitch angle of the telescopic support arm 61.

[0044] Example 2

[0045] As a further implementation of the above embodiment 1, such as Figures 5-8 As shown, a slider 27 is slidably fitted on the movable column 21 along its length direction; the bottom center of the strip plate 24 is hinged to one end of a connecting rod 28, and the other end of the connecting rod 28 is hinged to the corresponding slider 27. The rotation axes corresponding to both ends of the connecting rod 28 are parallel to the rotation axis between the strip plate 24 and the movable column 21; a rack 29 arranged along the length direction of the movable column 21 is connected to the side of the slider 27 facing the opening of the mounting frame 1; two coaxial rotating shafts 12 are mounted parallel to the top of the mounting frame 1 through a bracket 11 and are arranged in the length direction of the top of the mounting frame 1. A first gear 13 is coaxially mounted on both rotating shafts 12, which are used to mesh with the corresponding rack 29.

[0046] like Figures 5-8As shown, the locking mechanism 5 includes two columns 51 vertically positioned on the top of the mounting frame 1 and located between the two movable columns 21. The two columns 51 are arranged along the length of the top frame of the mounting frame 1. A pair of parallel first support plates 511 are provided on the top surface of the columns 51. The first support plates 511 face the length of the rotating shaft 12 and are perpendicular to the bottom of the mounting frame 1. A pair of first clamping plates 52 parallel to the first support plates 511 are also provided at the upper end of the columns 51. The two ends of the two first clamping plates 52 are respectively located on the corresponding columns. Between the two first support plates 511 on the top surface of 51; a top rod 53 is vertically inserted through the opposite back surfaces of the two first support plates 511 in each pair, one end of which is connected to the corresponding first clamping plate 52, and the other end is provided with a mounting head 531; one end of the two rotating shafts 12 is arranged opposite each other and extends between the two first clamping plates 52; a second spring 532 is sleeved on the top rod 53, which is connected between the first support plate 511 and the mounting head 531, for elastically loading the first clamping plate 52 to clamp the rotating shaft 12.

[0047] like Figure 5 , Figure 8 , Figure 10 As shown, a first mating block 44 is provided in the middle of the bottom surface of one end of the mounting box 41. The first mating block 44 is positioned corresponding to the first clamping plate 52 in the height direction of the top frame of the mounting frame 1. The bottom surface of the first mating block 44 is conical. When the mounting box 41 is a predetermined distance from the top of the mounting frame 1, the first mating block 44 can slide between the two first clamping plates 52 under the sliding engagement of its bottom surface and the upper end of the first clamping plate 52, and open the two first clamping plates 52.

[0048] In application, the linear mechanism 32 drives the mounting box 41 to move to a predetermined distance from the top of the mounting frame 1, causing the first mating block 44 to open the two first clamping plates 52, thereby separating the two first clamping plates 52 from the rotating shaft 12, allowing the rotating shaft 12 to rotate freely; the telescopic support arm 61 extends, driving the two rollers 25 to match the tunnel surface, the strip plate 24 rotates, and through the connecting rod 28 drives the slider 27 and rack 29 to move downward along the movable column 21, the rack 29 meshes with the first gear 13, causing the rotating shaft 12 to rotate; when the two When the rollers 25 abut against the corresponding curved surfaces, the different curvatures of the two curved surfaces cause the strip plate 24 to rotate at different angles, resulting in the two sliders 27 being at different heights. At this time, the linear mechanism 32 retracts, pushing the mounting box 41 away from the mounting frame 1 via the push rod 31. The first mating block 44 moves out from between the two first clamping plates 52. Under the action of the second spring 532, the two first clamping plates 52 clamp the two rotating shafts 12 to fix the first gear 13 and the rack 29, thereby fixing the two sliders 27 at different heights. Through the arrangement of the connecting rod 28, sliders 27, rack 29, and first gear 13, and in conjunction with the first clamping plates 52 and rotating shafts 12, the locking mechanism 5 can be linked to fix and release the sliders 27 while the mounting box 41 moves, which can effectively improve the automation level of the detection equipment; and the first clamping plates 52 and rotating shafts 12 can simultaneously fix the two sliders 27 at different heights, which is beneficial to improving the ease of operation.

[0049] Example 3

[0050] As a further implementation of the above embodiments 1-2, such as Figure 3 and Figure 9As shown, the locking mechanism 5 also includes two mounting rods 54 parallel to the top and bottom of the mounting frame 1 and located outside the two push rods 31 respectively. The mounting rods 54 are arranged along the width direction of the top of the mounting frame 1. The two ends of the mounting rods 54 are connected to second support plates 541, and the upper end of the second support plates 541 is connected to the top of the mounting frame 1. Two movable plates 55 are slidably passed through the mounting rods 54. One end of each movable plate 55 is vertically provided with a second clamping plate 56, which is located on both sides of the corresponding movable column 21. The other end of the two movable plates 55 is vertically provided with a mating plate 57. A mounting rod 54 is sleeved with... Two fourth springs 58, one end of which is connected to the corresponding second support plate 541 and the other end of which is connected to the corresponding movable plate 55, are used to elastically load the second clamping plate 56 to clamp the movable column 21. Two push rods 31 are provided with a second mating block 311, which corresponds to the second clamping plate 56 in the length direction of the push rod 31. The bottom surface of the second mating block 311 is conical. When the mounting box 41 is a predetermined distance from the top of the mounting frame 1, the second mating block 311 can slide between the two mating plates 57 through the sliding engagement between its bottom surface and the upper end of the mating plate 57 to open the two second clamping plates 56. Through the engagement between the mating plate 57 and the second mating block 311, the push rod 31 can not only push the mounting box 41 to move, but also lock the movable column 21 in conjunction with the locking mechanism 5, which can effectively improve the automation level of the detection equipment.

[0051] Example 4

[0052] As a further implementation of the above embodiments 1-3, such as Figures 10-12 As shown, the upper end of the push rod 31 is provided with an arc-shaped track 7, the convex surface of which faces the top of the mounting frame 1. The mounting box 41 is provided with a pair of parallel arc-shaped strips 45 that are adapted to the arc-shaped track 7, the convex surfaces of which face the same direction as the arc-shaped track 7. The two ends of the arc-shaped strips 45 are connected to the bottom sides of the mounting box 41, and the two arc-shaped strips 45 are slidably fitted on the arc-shaped track 7. The upper ends of the two push rods 31 are provided with adjustment parts 8 to adjust the deflection angle of the mounting box 41.

[0053] like Figures 10-12 As shown, the arc-shaped track 7 has arc-shaped holes 71 arranged along its edge arc. The adjustment part 8 includes an incomplete gear ring 81 arranged in the same direction between the two arc-shaped bars 45. The two ends of the incomplete gear ring 81 are connected to the bottom of the mounting box 41. The incomplete gear ring 81 is located in the arc-shaped hole 71. The curvature of the incomplete gear ring 81, the arc-shaped bars 45 and the arc-shaped track 7 are matched with each other. The adjustment part 8 also includes a pair of support plates 82 located on the upper end of the push rod 31 and below the arc-shaped track 7. The two ends of the support plates 82 are respectively connected to the corresponding push rods 31. The support plates 82 are equipped with motors 83. The drive end of the motor passes through the support plates 82 and is connected to a second gear 84. The second gear 84 meshes with the incomplete gear ring 81.

[0054] like Figure 4 and Figure 10 As shown, the mounting box 41 is provided with rotary cylinders 46 on both sides. The driving end of the cylinders is perpendicular to the top of the mounting frame 1 and connected to a stop bar 47, which is used to block the antenna box 42 when the antenna box 42 compresses the third spring 43 to a preset length.

[0055] In application, the linear mechanism 32 first moves the mounting box 41 close to the serif, and then the motor 83 drives the second gear 84 to mesh with the incomplete gear ring 81 to adjust the deflection angle of the mounting box 41 so that the slide plate 48 of the antenna box 42 is aligned with the serif. After that, the rotary cylinder 46 drives the stop bar 47 to rotate, releasing the antenna box 42, so that the third spring 43 accurately fits the slide plate 48 into the serif to be tested, further ensuring the accuracy of the test.

[0056] It should be noted that when the tunnel cross-section is semi-circular, the curvature of the tunnel surface is always equal. When the upper end of the telescopic support arm 61 is aligned with the serif, the contact surface of the slide plate 48 is also automatically aligned with the serif. Therefore, it is not necessary to use the above structure to further adjust the deflection angle of the mounting box 41. The same principle applies to the horseshoe-shaped end face tunnel when the telescopic support arm 61 drives the roller 25 to engage with the curved surface. The difference is that the timing of the roller 25 contacting the curved surface is different.

[0057] The above description is only a preferred embodiment of this application and is not intended to limit this application. Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application.

Claims

1. A tunnel lining testing device, characterized in that, include: The mounting frame (1) is rectangular in shape; The guide mechanism (2) includes two vertical movable columns (21) that slide through the top of the mounting frame (1). The bottom of each column is provided with a guide rod (22) that passes through the bottom of the mounting frame (1) in a vertical direction. A first spring (23) is provided on the guide rod (22) for elastically supporting the movable columns (21). The upper ends of the two movable columns (21) are rotatably connected to strip plates (24). The rotation axes of the two strip plates (24) are parallel to each other and are both parallel to the top of the mounting frame (1). Rollers (25) are mounted on the strip plates (24) in the same direction. The axes of the two rollers (25) are coplanar with the axis of the guide rod (22). A spring plate (26) is provided between the upper end of the movable column (21) and the corresponding strip plate (24) for elastically supporting the strip plate (24) to be perpendicular to the movable column (21). The drive unit (3) includes a pair of push rods (31) located between the two movable columns (21) and passing through the top of the mounting frame (1) in the vertical direction; the mounting frame (1) is provided with a linear mechanism (32) for driving the two push rods (31) to move synchronously in the vertical direction; The detection component (4) includes a mounting box (41) connected to the upper end of two push rods (31), with its top surface facing the top of the mounting frame (1) and open; an antenna box (42) is provided inside the mounting box (41); a third spring (43) is provided between the antenna box (42) and the bottom of the mounting box (41) to support the detection surface of the antenna box (42) out of the top surface of the mounting box (41); The locking mechanism (5) is located at the top of the mounting frame (1). When the mounting box (41) is a predetermined distance from the top of the mounting frame (1), the locking mechanism (5) is used to release the strip plate (24) and the movable column (21). When the push rod (31) pushes the mounting box (41) away from the top of the mounting frame (1), the locking mechanism (5) is used to fix the strip plate (24) and the movable column (21). The mobile platform (6) is provided with a telescopic support arm (61). The lower end of the telescopic support arm (61) is connected to the top surface of the mobile platform (6) through a movable joint (62). The movable joint (62) is used to support the rotation of the telescopic support arm (61) around the axis perpendicular to the mobile platform (6) and the adjustment of its pitch angle. The upper end of the telescopic support arm (61) is connected to the bottom of the mounting frame (1).

2. The tunnel lining testing equipment according to claim 1, characterized in that, A slider (27) is slidably fitted on the movable column (21) along its length; the bottom of the strip plate (24) is hinged to one end of a connecting rod (28), and the other end of the connecting rod (28) is hinged to the corresponding slider (27). The rotation axes corresponding to both ends of the connecting rod (28) are parallel to the rotation axis between the strip plate (24) and the movable column (21); a rack (29) arranged along the length of the movable column (21) is connected to the side of the slider (27) facing the opening of the mounting frame (1); two coaxial rotating shafts (12) are mounted on the top of the mounting frame (1) through a bracket (11). The two rotating shafts (12) are coaxially equipped with a first gear (13), which is used to mesh with the corresponding rack (29). The locking mechanism (5) is used to fix the two rotating shafts (12).

3. The tunnel lining testing equipment according to claim 2, characterized in that, The locking mechanism (5) includes two columns (51) vertically positioned on the top of the mounting frame (1) and located between the two movable columns (21). A pair of parallel first support plates (511) are provided on their top surfaces. The first support plates (511) face the length direction of the rotating shaft (12) and are perpendicular to the bottom of the mounting frame (1). A pair of first clamping plates (52) parallel to the first support plates (511) are also provided at the upper end of the columns (51). The two ends of the two first clamping plates (52) are respectively located on the top surfaces of the corresponding columns (51). Between the first support plates (511); a top rod (53) is vertically inserted through the first support plate (511), one end of which is connected to the corresponding first clamping plate (52), and the other end is provided with a mounting head (531); one end of the two rotating shafts (12) is arranged opposite to each other and extends between the two first clamping plates (52); a second spring (532) is sleeved on the top rod (53), which is connected between the first support plate (511) and the mounting head (531) for elastically loading the first clamping plate (52) to clamp the rotating shaft (12).

4. The tunnel lining testing equipment according to claim 3, characterized in that, The mounting box (41) has a first mating block (44) in the middle of the bottom surface at one end. Its bottom surface is conical and is used to enter between the two first clamping plates (52) when the mounting box (41) is a predetermined distance from the top of the mounting frame (1) to open the two first clamping plates (52).

5. The tunnel lining testing equipment according to claim 3, characterized in that, The locking mechanism (5) also includes two mounting rods (54) that are parallel to the top and bottom of the mounting frame (1) and located on the outside of the two push rods (31). The two ends of the mounting rods (54) are connected to the second support plate (541), and the upper end of the second support plate (541) is connected to the top of the mounting frame (1). Two movable plates (55) are slidably passed through the mounting rods (54). One end of each movable plate (55) is vertically provided with a second clamping plate (56), which is located on both sides of the corresponding movable column (21). The other end of the two movable plates (55) is vertically provided with a mating plate (57). Two fourth springs (58) are sleeved on the mounting rods (54). One end of each spring is connected to the corresponding second support plate (541), and the other end is connected to the corresponding movable plate (55), which are used to elastically load the second clamping plate (56) to clamp the movable column (21).

6. The tunnel lining testing equipment according to claim 5, characterized in that, Two push rods (31) are provided with a second mating block (311) with a conical bottom surface, which is used to enter between the corresponding two mating plates (57) when the mounting box (41) is a predetermined distance from the top of the mounting frame (1) to open the two second clamping plates (56).

7. The tunnel lining testing equipment according to claim 4, characterized in that, The upper end of the push rod (31) is provided with an arc-shaped track (7), and the bottom surface of the mounting box (41) is provided with an arc-shaped strip (45), which slides on the arc-shaped track (7); the upper ends of the two push rods (31) are provided with adjustment parts (8) to adjust the deflection angle of the mounting box (41).

8. The tunnel lining testing equipment according to claim 7, characterized in that, Rotary cylinders (46) are provided on both sides of the mounting box (41). The driving end of the cylinder is perpendicular to the top of the mounting frame (1) and connected to a stop bar (47), which is used to block the antenna box (42) when the antenna box (42) compresses the third spring (43) to a preset length.

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