Thickness detection device

Abstract

The utility model provides a thickness detection device, which comprises a reflection sheet embedded between the outer surface of a primary lining outline and the outer surface of a secondary lining outline; the two arc-shaped guide rails are arranged on the inner surface of the secondary lining outline at intervals and are concentrically arranged; the detection assembly comprises a detection platform, a roller and a geological radar, the detection platform is movably arranged on the arc-shaped guide rail and has a first movement stroke and a second movement stroke, the roller is rotationally arranged on the detection platform and used for abutting against the inner surface of the secondary lining outline, and the geological radar is arranged on the detection platform and used for detecting the secondary lining outline. The reflector is used for being matched with the reflecting sheet; when the detection platform is in the first movement stroke or the second movement stroke, the rollers abut against the inner surface of the outline of the second lining. The technical problem of low accuracy of tunnel lining thickness detection data in the prior art is solved.

Description

Technical Field

[0001] This utility model relates to the field of tunnel construction technology, and in particular to a thickness detection device. Background Technology

[0002] Ground-penetrating radar (GPR) detection utilizes high-frequency electromagnetic waves in the form of wideband short pulses. Its operation involves an antenna placed on the surface emitting a high-frequency electromagnetic pulse wave. During propagation, the electromagnetic wave encounters a medium interface, which affects the propagation of the electromagnetic signal and causes reflection. Currently, in GPR detection of tunnel lining, survey lines are typically laid out on the tunnel lining surface. The GPR antenna is moved along the survey lines to obtain a set of reflected waveforms. From these, the reflecting interface is identified, the reflection time is determined, and the tunnel lining thickness is determined based on the electromagnetic wave velocity. However, this method often suffers from low accuracy due to the small difference in electromagnetic characteristics between the secondary lining and the primary lining interface, resulting in a weak reflected interface signal that is difficult to identify. This can negatively impact project quality. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention provides a thickness detection device that solves the technical problem of low accuracy in tunnel secondary lining thickness detection data in existing technologies.

[0004] According to the embodiments of this utility model, the following technical solution is adopted:

[0005] A thickness detection device is applied to a tunnel, the tunnel including a primary lining profile and a secondary lining profile, the secondary lining profile having an outer surface and an inner surface, and its outer surface conforming to the primary lining profile, characterized in that the detection device comprises:

[0006] A reflective sheet is embedded between the outer surfaces of the primary liner profile and the secondary liner profile;

[0007] Two arc-shaped guide rails are spaced apart on the inner surface of the two lining contours, and both are arranged with the same center.

[0008] The detection assembly includes a detection platform, rollers, and a ground-penetrating radar. The detection platform is movably mounted on the arc-shaped guide rail and has a first travel and a second travel. During the first travel, the detection platform moves towards the arc-shaped guide rail, and during the second travel, the detection platform moves away from the arc-shaped guide rail. The rollers are rotatably mounted on the detection platform and are used to abut against the inner surface of the secondary lining profile. The ground-penetrating radar is mounted on the detection platform and is used to cooperate with the reflective sheet.

[0009] When the detection platform is in the first or second active stroke, the rollers abut against the inner surface of the secondary lining contour.

[0010] Preferably, the detection platform is provided with multiple telescopic rods and compression springs, the two ends of the telescopic rods are connected to the detection platform and the arc-shaped guide rail, and the compression springs are sleeved on the telescopic rods.

[0011] Preferably, the detection component further includes:

[0012] A base is provided on the outline of the two linings;

[0013] The truss has a first end and a second end that are arranged opposite to each other. The first end is connected to the telescopic rod, and the second end is rotatably connected to the base.

[0014] Preferably, the detection device further includes a driving component, the driving component comprising:

[0015] An arc-shaped toothed plate is disposed between two arc-shaped guide rails, and a guide groove is formed between the arc-shaped toothed plate and the arc-shaped guide rails. The first end of the truss is movably attached to the guide groove.

[0016] The drive gear meshes with the arc-shaped toothed plate;

[0017] A drive motor is mounted on the truss, and its output end is connected to the drive gear.

[0018] Preferably, the reflective sheet is made of metal.

[0019] Preferably, the reflective sheet is covered with a waterproof cloth.

[0020] Preferably, the plurality of the reflective sheets are arranged at equal intervals.

[0021] Compared with the prior art, this utility model has the following advantages: it optimizes the application of ground-penetrating radar in tunnel lining thickness detection by using a reflective sheet, effectively overcomes the problem of weak reflected signal caused by the small difference in electromagnetic properties between the secondary lining and the primary lining interface, and improves the accuracy and reliability of detection. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the detection device installed in a tunnel according to one embodiment of the present invention;

[0023] Figure 2 This is a front view of the detection device installed in a tunnel according to one embodiment of the present invention;

[0024] Figure 3 This is a schematic diagram of the detection device in one embodiment of the present invention;

[0025] Figure 4 for Figure 3 A magnified view of a portion of point A in the middle.

[0026] In the above figures: 1. Primary lining outline; 2. Secondary lining outline; 3. Reflective sheet; 4. Arc-shaped guide rail; 5. Arc-shaped toothed plate; 51. Guide groove; 6. Drive gear; 7. Drive motor; 8. Detection platform; 9. Telescopic rod; 10. Compression spring; 11. Base; 12. Truss; 13. Roller; 14. Ground penetrating radar. Detailed Implementation

[0027] To make the objectives, technical solutions, and beneficial effects of this utility model clearer, the technical solutions of this utility model are further described below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of this utility model and are not intended to limit it.

[0028] See Figures 1 to 4 This utility model provides a thickness detection device applied to a tunnel, the tunnel including a primary lining profile 1 and a secondary lining profile 2, the secondary lining profile 2 having an outer surface and an inner surface, and its outer surface fitting into the primary lining profile 1, the detection device comprising:

[0029] A reflective sheet 3 is embedded between the outer surfaces of the primary lining contour 1 and the secondary lining contour 2;

[0030] Two arc-shaped guide rails 4 are spaced apart on the inner surface of the secondary lining contour 2, and both are arranged with the same center.

[0031] The detection assembly includes a detection platform 8, rollers 13, and a ground-penetrating radar 14. The detection platform 8 is movably mounted on the arc-shaped guide rail 4 and has a first travel and a second travel. During the first travel, the detection platform 8 moves towards the arc-shaped guide rail 4, and during the second travel, the detection platform 8 moves away from the arc-shaped guide rail 4. The rollers 13 are rotatably mounted on the detection platform 8 and are used to abut against the inner surface of the secondary lining contour 2. The ground-penetrating radar 14 is mounted on the detection platform 8 and is used to cooperate with the reflective sheet 3.

[0032] When the detection platform 8 is in the first or second active stroke, the roller 13 abuts against the inner surface of the secondary lining contour 2.

[0033] In this embodiment, due to the small difference in electromagnetic properties between the surface of the primary lining contour 1 and the secondary lining contour 2, the reflected interface signal is weak and difficult to accurately identify, which affects the clarity and reliability of the data and reduces the detection accuracy. Therefore, a reflective sheet 3 is pre-embedded between the outer surfaces of the primary lining contour 1 and the secondary lining contour 2 as a reflective marker for the ground-penetrating radar 14, ensuring clear reflection of the ground-penetrating radar 14 signal, thereby locating the distance between the primary lining contour 1 and the secondary lining contour 2. Two concentric arc-shaped guide rails 4 are fixed to the inner surface of the secondary lining to provide a stable movement trajectory for the detection components, ensuring that the scanning path of the ground-penetrating radar 14 is consistent with the curvature of the tunnel. At the same time, when the detection platform 8 is in the first active stroke, The detection platform 8 moves radially toward the arc-shaped guide rail 4. The detection platform 8, in conjunction with the ground-penetrating radar 14, moves away from the secondary lining profile 2, meaning that the secondary lining profile 2 is thicker at this point. When the detection platform 8 is in the second active stroke, the detection platform 8 moves away from the arc-shaped guide rail 4, and the detection platform 8, in conjunction with the ground-penetrating radar 14, moves closer to the secondary lining profile 2, meaning that the secondary lining profile 2 is thinner at this point. During the first and second active strokes, the roller 13 always remains in contact with the inner surface of the secondary lining profile 2. If the thickness is consistent, then the detection platform 8 does not have the first and second active strokes, meaning that the detection platform 8 neither moves closer to nor away from the arc-shaped guide rail 4, and the thickness of the secondary lining profile 2 is consistent. Specifically, by keeping the roller 13 in close contact with the inner surface of the secondary lining, the distance between the detection platform 8 and the secondary lining contour 2 is kept constant to avoid vibration interference. At the same time, the detection platform 8 moves along the curved guide rail 4. The ground-penetrating radar 14 is installed on the detection platform 8 and emits electromagnetic waves towards the secondary lining contour 2. After the signal is reflected by the reflective sheet 3, the thickness of the primary lining contour 1 and the secondary lining contour 2 is calculated by analyzing the round-trip time difference of the signal. The reflective sheet 3 serves as a marker to eliminate the error caused by the blurring of the material interface in traditional radar, thereby improving the identification accuracy of the interface between the primary lining contour 1 and the secondary lining contour 2. Meanwhile, the detected data is fused and analyzed, and data from different frequency bands are comprehensively processed. Cross-validation is used to increase the reliability of the data and improve the accuracy of the detection results. Alternatively, time-frequency analysis, waveform matching, and inversion methods can be used to conduct in-depth analysis and processing of the reflected signal, thereby more accurately determining the thickness of the tunnel lining and improving the detection accuracy.

[0034] The detection platform 8 is provided with multiple telescopic rods 9 and compression springs 10. The two ends of the telescopic rods 9 are connected to the detection platform 8 and the arc-shaped guide rail 4, and the compression springs 10 are sleeved on the telescopic rods 9.

[0035] In this embodiment, in order to ensure that the roller 13 always abuts against the secondary lining contour 2, four telescopic rods 9 and four compression springs 10 are provided on the detection platform 8. One end of the telescopic rod 9 is connected to the detection platform 8, and the other end is connected to the arc-shaped guide rail 4, which restricts the movement direction of the detection platform 8 to prevent lateral deviation or shaking. The telescopic length of the telescopic rod 9 determines the range of movement of the detection platform 8 in the first and second active strokes. The compression springs 10 are sleeved on the telescopic rods 9 to provide radial elastic support for the detection platform 8. When the inner surface of the secondary lining contour 2 is uneven, the compression or rebound of the compression springs 10 keeps the roller 13 in contact, offsetting the influence of local unevenness, and enabling the ground radar 14 to intuitively reflect the thickness of the secondary lining contour 2.

[0036] The detection component also includes:

[0037] Base 11 is disposed on the outline 2 of the second liner;

[0038] The truss 12 has a first end and a second end that are arranged opposite to each other. The first end is connected to the telescopic rod 9, and the second end is rotatably connected to the base 11.

[0039] In this embodiment, a base 11 is set within the secondary lining contour 2, and a truss 12 is rotatably mounted on the base 11. The second end of the truss 12 is connected to a telescopic rod 9. By rotating the truss 12 around the base 11, the posture of the detection platform 8 is automatically adjusted so that the roller 13 remains in contact with the inner surface of the secondary lining throughout the entire process. When there are uneven areas on the inner surface of the secondary lining, the ground-penetrating radar 14 moves closer to or away from the truss 12 via the telescopic rod 9 and the compression spring 10. A pulley should be provided at the bottom of the base 11 to facilitate the movement of the detection device.

[0040] The detection device further includes a driving component, which comprises:

[0041] An arc-shaped toothed plate 5 is disposed between two arc-shaped guide rails 4, and a guide groove 51 is formed between the arc-shaped toothed plate 5 and the arc-shaped guide rails 4. The first end of the truss 12 is movably attached to the guide groove 51.

[0042] The drive gear 6 meshes with the arc-shaped toothed plate 5;

[0043] A drive motor 7 is located on the truss 12, and its output end is connected to the drive gear 6.

[0044] In this embodiment, the arc-shaped toothed plate 5 is fixedly installed between two arc-shaped guide rails 4, with the same center as the arc-shaped guide rails 4, and has a continuous rack structure. The gap between the arc-shaped toothed plate 5 and the arc-shaped guide rails 4 forms a guide groove 51, which is used to constrain the movement trajectory of the first end of the truss 12, ensuring that it moves smoothly along the predetermined arc path and preventing deviation or jamming. The drive gear 6 meshes with the arc-shaped toothed plate 5, converting the rotational motion of the drive motor 7 into the arc-shaped motion of the detection platform 8 along the guide rail. The drive motor 7 is installed on the truss 12 and controls the speed and direction to realize the forward, backward or pause of the detection platform 8, realizing the automatic continuous scanning of the detection platform 8 along the tunnel lining, which is especially suitable for long-distance, large-curvature tunnel detection.

[0045] The reflective sheet 3 is made of metal. Furthermore, the reflective sheet 3 is covered with a waterproof cloth.

[0046] In this embodiment, the reflective sheet 3 is made of metal (such as aluminum, stainless steel or copper) and is embedded between the primary lining contour 1 and the secondary lining contour 2 as a high reflectivity marker of the ground-penetrating radar 14. The dielectric constant of the metal is much greater than that of the concrete, and electromagnetic waves will be strongly reflected at the metal-to-concrete interface, making the radar signal clearer and facilitating accurate identification of the positions of the primary lining contour 1 and the secondary lining contour 2. A waterproof cloth (not shown) is wrapped around the metal reflective sheet 3 to form a moisture-proof protective layer, preventing groundwater or condensation from corroding the metal sheet and preventing oxidation / corrosion from causing a decrease in reflectivity.

[0047] The multiple reflective sheets 3 are arranged at equal intervals.

[0048] In this embodiment, the equidistantly distributed reflective sheets 3 can provide uniform reference points, making the data of the ground-penetrating radar 14 spatially consistent and facilitating the calculation of the lining thickness. Of course, the reflective sheets 3 are also directly covered on the outer surface of the secondary lining contour 2 to avoid signal attenuation caused by burial depth.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A thickness detection device applied to a tunnel, the tunnel comprising a primary lining profile and a secondary lining profile, the secondary lining profile having an outer surface and an inner surface, the outer surface of which is fitted to the primary lining profile, characterized in that, The detection device includes: A reflective sheet is embedded between the outer surfaces of the primary liner profile and the secondary liner profile; Two arc-shaped guide rails are spaced apart on the inner surface of the two lining contours, and both are arranged with the same center. The detection assembly includes a detection platform, rollers, and a ground-penetrating radar. The detection platform is movably mounted on the arc-shaped guide rail and has a first travel and a second travel. During the first travel, the detection platform moves towards the arc-shaped guide rail, and during the second travel, the detection platform moves away from the arc-shaped guide rail. The rollers are rotatably mounted on the detection platform and are used to abut against the inner surface of the secondary lining profile. The ground-penetrating radar is mounted on the detection platform and is used to cooperate with the reflective sheet. When the detection platform is in the first or second active stroke, the rollers abut against the inner surface of the secondary lining contour.

2. The thickness detection device according to claim 1, characterized in that, The testing platform is equipped with multiple telescopic rods and compression springs. The two ends of the telescopic rods are connected to the testing platform and the arc-shaped guide rail, and the compression springs are sleeved on the telescopic rods.

3. The thickness detection device according to claim 2, characterized in that, The detection component also includes: A base is provided on the outline of the two linings; The truss has a first end and a second end that are arranged opposite to each other. The first end is connected to the telescopic rod, and the second end is rotatably connected to the base.

4. The thickness detection device according to claim 3, characterized in that, The detection device further includes a driving component, which comprises: An arc-shaped toothed plate is disposed between two arc-shaped guide rails, and a guide groove is formed between the arc-shaped toothed plate and the arc-shaped guide rails. The first end of the truss is movably attached to the guide groove. The drive gear meshes with the arc-shaped toothed plate; A drive motor is mounted on the truss, and its output end is connected to the drive gear.

5. A thickness detection device according to claim 1, characterized in that, The reflective sheet is made of metal.

6. A thickness detection device according to claim 5, characterized in that, The reflective sheet is covered with a waterproof cloth.

7. The thickness detection device according to claim 1, characterized in that, The multiple reflective sheets are arranged at equal intervals.

Images