Concrete bridge crack depth detection device

Abstract

The utility model discloses a concrete bridge crack depth detection device which comprises a crack depth tester body, an adjusting assembly is arranged between an adjusting frame and a transducer, and balance weight assemblies are symmetrically arranged on the left side and the right side of the upper end face of the adjusting frame. Therefore, a first supporting plate can drive a transmission gear to rotate through a first extension piece and a first rack, and the rotating transmission gear can drive a second supporting plate to synchronously move in different directions through a second rack and a second extension piece in sequence, so that the left and right groups of transducers are adjusted at equal intervals; a plurality of balancing weights are symmetrically placed in placing grooves in the left side and the right side of the upper end face of an adjusting frame, so that the balancing weights can further apply downward pressure to the adjusting frame, and the adjusting frame can further apply downward pressure to the two sets of transducers through a first supporting plate, a second supporting plate and a mounting sleeve. And therefore, the transducer with the bottom coated with the coupling agent can be in full contact with the surface of the concrete bridge plate.

Description

Technical Field

[0001] This utility model relates to the technical field of concrete bridge crack depth detection equipment, and in particular, to a concrete bridge crack depth detection device. Background Technology

[0002] Cracks are the most common defects in concrete structures, and this is also true for bridge engineering. As the time a bridge is open to traffic increases, the number of cracks in the bridge beams and slabs along the route will also increase, and the width and length of the cracks will also continue to increase. In severe cases, they will endanger the use of the bridge. Therefore, it is necessary to use a crack depth tester to monitor the cracks in the beams and slabs of concrete bridges regularly to ensure the normal operation of the bridge.

[0003] The concrete crack detection device disclosed in announcement number "CN218723961 U" involves simultaneously fixing two transducers on an adjustment frame, which allows the two transducers to move synchronously until they are in contact with the concrete. Furthermore, by adjusting the fixed position of the transducers on the adjustment frame, the distance between the two transducers can be adjusted. This allows the construction inspection personnel to operate the two transducers with one hand and the detection instrument body with the other, thus solving the problem that it is difficult to operate the device by a single construction inspection personnel when detecting the depth of concrete cracks.

[0004] However, the above technical solutions and existing technologies have the following drawbacks:

[0005] Although this concrete crack detection device can adjust the spacing between two transducers, it requires adjusting each transducer individually, making it inconvenient to adjust the spacing equally and resulting in low convenience. Furthermore, during use, the adjustment frame cannot stably apply downward pressure to the two transducers, causing them to not fit tightly against the concrete bridge slab. This can lead to abnormal sound wave propagation paths or loss of the first wave signal, affecting the accuracy of the acoustic time data and ultimately increasing the error in crack depth calculation, thus compromising its practicality. Utility Model Content

[0006] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a device for detecting the depth of cracks in concrete bridges. By setting an adjustment component, the spacing between two sets of transducers can be adjusted at equal intervals, so that in the ultrasonic flat measurement method, the transmitting and receiving transducers are symmetrically distributed on both sides of the crack, ensuring that the sound wave propagates around the crack endpoint to the receiving end. By setting a counterweight component, a downward pressure can be applied to the transducers, allowing the bottom of the transducers to fully contact the surface of the concrete beam, thereby ensuring the stability of the ultrasonic wave propagation path and avoiding sound energy loss or signal distortion due to air gaps.

[0007] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0008] A crack depth detection device for concrete bridges includes a crack depth tester body, a connecting line, a transducer, and an adjustment frame. The transducer has two sets, and the two sets of transducers are electrically connected to the crack depth tester body via the connecting line. The adjustment frame is placed in front of the crack depth tester body. An adjustment assembly is provided between the adjustment frame and the transducers, and the adjustment assembly is used to adjust and support the distance between the two sets of transducers. Counterweight assemblies are symmetrically arranged on the left and right sides of the upper end face of the adjustment frame. The adjustment assembly includes two mounting sleeves, a first support plate and a second support plate slidably disposed inside the adjustment frame and arranged at intervals. The two mounting sleeves are respectively fixed to the first support plate and the second support plate. The transducer is assembled inside the mounting sleeve and extends through the first support plate and the second support plate to the lower bottom of the adjustment frame. A linkage mechanism is provided between the first support plate and the second support plate to adjust the distance between the first support plate and the second support plate.

[0009] Furthermore, the linkage mechanism includes a first extension plate, a first rack, a second extension plate, a second rack, a support shaft, and a transmission gear. The first support plate is connected to the first rack through the first extension plate, and the second support plate is connected to the second rack through the second extension plate. The adjustment frame is equipped with the transmission gear through the support shaft. The first rack and the second rack are parallel and mesh with each other through the transmission gear.

[0010] Furthermore, the first extension piece is disposed on the lower side of the front end face of the first support plate, the first rack is fixed to the front side of the upper end face of the first extension piece, and a first through groove is provided on the right side of the front end face of the adjustment frame, and the first through groove matches the first extension piece so that the first extension piece and the first rack extend out of the front end face of the adjustment frame; the second extension piece is installed on the upper side of the front end face of the second support plate, the second rack is installed on the front side of the lower end face of the second extension piece, and a second through groove is provided on the left side of the front end face of the adjustment frame, and the second through groove matches the second extension piece so that the second rack and the second extension piece extend out of the front end face of the adjustment frame.

[0011] Furthermore, a protective cover is installed on the front end face of the adjustment frame, and the protective cover covers the outside of the first extension plate, the first rack, the second extension plate, the second rack, the support shaft, and the transmission gear.

[0012] Furthermore, the counterweight assembly includes counterweight blocks and placement slots. The placement slots are divided into two sets and are respectively opened on the left and right sides of the upper end face of the adjustment frame. Multiple counterweight blocks are placed inside the placement slots.

[0013] Furthermore, a pinch head is provided at the upper end of the counterweight.

[0014] Furthermore, the inner wall of the adjustment frame is symmetrically provided with limiting grooves on the front and rear sides, and the limiting grooves are respectively matched with the first support plate and the second support plate to achieve sliding fit.

[0015] Furthermore, the left and right ends of the adjustment frame are symmetrically and fixedly connected with handles.

[0016] Furthermore, a vertical screw is provided on the rear side of the upper end face of the first support plate, and a fastening nut is threaded on the upper side of the annular side of the vertical screw. A limit groove is provided on the rear side of the upper end face of the adjusting frame, and the limit groove matches the vertical screw.

[0017] Furthermore, the outer side of the mounting sleeve is provided with an internally threaded through hole, and a locking screw is installed inside the internally threaded through hole to fasten or loosen the transducer inside the mounting sleeve.

[0018] This utility model has the following beneficial effects:

[0019] 1. By setting a linkage mechanism in the adjustment component, when the first support plate moves left and right, the first support plate can drive the transmission gear to rotate through the first extension plate and the first rack. The rotating transmission gear will drive the second support plate to move synchronously in opposite directions through the second rack and the second extension plate in sequence. This allows for equal spacing adjustment of the left and right sets of transducers, so that in the ultrasonic flat measurement method, the transmitting and receiving transducers are symmetrically distributed on both sides of the crack, ensuring that the sound wave bypasses the crack endpoint and propagates to the receiving end.

[0020] 2. By symmetrically placing multiple counterweights in the placement slots on the left and right sides of the upper end face of the adjustment frame, the multiple counterweights can further apply downward pressure to the adjustment frame. The adjustment frame will further apply downward pressure to the two sets of transducers through the first support plate, the second support plate, and the mounting sleeve, thereby enabling the transducers with coupling agent applied to the bottom to fully contact the surface of the concrete bridge slab. This ensures the stability of the ultrasonic wave propagation path and avoids sound energy loss or signal distortion due to air gaps, making it highly practical.

[0021] In addition to the objectives, features, and advantages described above, this utility model has other objectives, features, and advantages. The present utility model will now be described in further detail with reference to the figures. Attached Figure Description

[0022] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0023] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0024] Figure 2 This is a structural diagram of the counterweight component and the adjustment component in this utility model;

[0025] Figure 3 This is a partial structural diagram of the adjustment component in this utility model;

[0026] Figure 4 yes Figure 2 A magnified view of A in the middle.

[0027] Legend:

[0028] 100. Crack depth tester body; 200. Connecting cable; 300. Transducer; 400. Adjustment frame; 401. Handle; 500. Counterweight assembly; 501. Grip head; 502. Counterweight block; 503. Placement slot; 600. Adjustment assembly; 601. Mounting sleeve; 6011. Locking screw; 6012. Internal threaded through hole; 602. Limiting through slot; 603. Fastening nut; 604. First support plate; 605. Second support plate; 606. Protective cover; 607. Vertical screw; 608. Second extension plate; 609. Second rack; 611. First rack; 612. Support shaft; 613. Transmission gear; 614. First extension plate; 615. Second through slot; 616. First through slot; 617. Limiting slot. Detailed Implementation

[0029] It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0031] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0032] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0033] Please refer to Figures 1 to 4 The present invention provides a preferred embodiment of a concrete bridge crack depth detection device, comprising a crack depth tester body 100, a connecting line 200, a transducer 300, and an adjustment frame 400. Two sets of transducers 300 are installed in front of the crack depth tester body 100, and the connecting line 200 connects the two sets of transducers 300 to the crack depth tester body 100. The crack depth tester body 100, the connecting line 200, and the two sets of transducers 300 facilitate the detection of crack depth at the concrete bridge by the operator. The crack structure at this location needs to conform to the characteristics of a unilateral non-through crack, and the crack direction needs to be basically perpendicular to the surface. Since the detailed internal structure and working principle of the crack depth tester body 100 and the transducer 300 are relatively mature technologies in the prior art, they will not be described in detail here.

[0034] An adjustment frame 400 is placed in front of the main body 100 of the crack depth tester. The adjustment frame 400 can support the adjustment component 600. The left and right ends of the adjustment frame 400 are symmetrically and fixedly connected with a handle 401. The handle 401 and the adjustment frame 400 are an integral structure. The handle 401 makes it convenient for staff to pick up the adjustment frame 400 by hand.

[0035] An adjustment component 600 is provided between the adjustment frame 400 and the transducer 300. The adjustment component 600 is used to adjust the spacing between the two sets of transducers 300 at equal intervals so that, in the ultrasonic flat test method, the transmitting and receiving transducers 300 are symmetrically distributed on both sides of the crack, ensuring that the sound wave bypasses the end of the crack and propagates to the receiving end. Counterweight components 500 are symmetrically arranged on the left and right sides of the upper surface of the adjustment frame 400. The counterweight components 500 are used to increase the self-weight of the adjustment frame 400 so that the bottom of the transducer 300 can fully contact the surface of the concrete bridge slab, thereby ensuring the stability of the ultrasonic wave propagation path and avoiding sound energy loss or signal distortion due to air gaps.

[0036] like Figure 2As shown, the adjustment assembly 600 includes two mounting sleeves 601, a first support plate 604 and a second support plate 605 slidably disposed inside the adjustment frame 400 and arranged at intervals. The two mounting sleeves 601 are respectively fixed on the first support plate 604 and the second support plate 605. The transducer 300 is assembled inside the mounting sleeve 601 and extends through the first support plate 604 and the second support plate 605 to the lower side of the bottom of the adjustment frame 400. A linkage mechanism is provided between the first support plate 604 and the second support plate 605 to adjust the distance between the first support plate 604 and the second support plate 605.

[0037] like Figure 3 , Figure 4 As shown, the linkage mechanism includes a first extension plate 614, a first rack 611, a second extension plate 608, a second rack 609, a support shaft 612, and a transmission gear 613. The first support plate 604 is connected to the first rack 611 through the first extension plate 614. The second support plate 605 is connected to the second rack 609 through the second extension plate 608. The adjustment frame 400 is equipped with the transmission gear 613 through the support shaft 612. The first rack 611 and the second rack 609 are parallel and mesh with each other through the transmission gear 613. The transmission gear 613 enables the second rack 609 and the first rack 611 to move synchronously in opposite directions.

[0038] Specifically, a first extension piece 614 is provided on the lower side of the front end face of the first support plate 604, and a first rack 611 is provided on the front side of the upper end face of the first extension piece 614. The first extension piece 614, the first rack 611, and the first support plate 604 are all connected by welding. The first extension piece 614 can support the first rack 611. When the first rack 611 moves left and right, it will drive the transmission gear 613 to rotate. A first through slot 616 is provided on the right side of the front end face of the adjusting frame 400, and the first through slot 616 matches the first extension piece 614 so that the first extension piece 614 and the first rack 611 extend out of the front end face of the adjusting frame 400; the first through slot 616 and the first rack 611 extend out of the front end face of the adjusting frame 400. The limiting groove 617 located on the front side of the inner wall of the adjusting frame 400 is connected. The first through groove 616 not only facilitates the left and right movement of the first extension piece 614 at the front end of the adjusting frame 400, but also limits the first extension piece 614. The second extension piece 608 is provided on the upper side of the front end face of the second support plate 605. The second extension piece 608 is connected to the first rack 611 and the second support plate 605 by welding. The second extension piece 608 can support the second rack 609. The second rack 609 is provided on the front side of the lower end face of the second extension piece 608. The second rack 609 facilitates the transmission gear 613 to drive the second support plate 605 to move left and right through the second extension piece 608.

[0039] A second through groove 615 is provided on the left side of the front end face of the adjustment frame 400, and the second through groove 615 matches the second extension piece 608 so that the second rack 609 and the second extension piece 608 extend out of the front end face of the adjustment frame 400. The second through groove 615 is connected to the limiting groove 617 located on the front side of the inner wall of the adjustment frame 400. The second through groove 615 not only facilitates the left and right movement of the second extension piece 608 at the front end of the adjustment frame 400, but also limits the second extension piece 608.

[0040] In some embodiments of this technical solution, a protective cover 606 is installed on the front end face of the adjusting frame 400. The protective cover 606 is a detachable structure. The protective cover 606 covers the outside of the first extension piece 614, the first rack 611, the second extension piece 608, the second rack 609, the support shaft 612, and the transmission gear 613. The protective cover 606 can protect the transmission gear 613, the first rack 611, the second rack 609, the first extension piece 614, and the second extension piece 608. The support shaft 612 and the transmission gear 613 are an integral structure. The support shaft 612 can not only support the transmission gear 613, but also enable the transmission gear 613 to rotate.

[0041] The adjusting frame 400 has symmetrically provided limiting grooves 617 on both the front and rear sides of its inner wall, and the limiting grooves 617 are respectively matched with the first support plate 604 and the second support plate 605. The limiting grooves 617 prevent the first support plate 604 and the second support plate 605 from shifting or slipping during adjustment. A vertical screw 607 is provided on the rear side of the upper end face of the first support plate 604. The vertical screw 607 is connected to the first support plate 604 by welding. A fastening nut 603 is threaded on the upper side of the annular side of the vertical screw 607. The vertical screw 607 and the fastening nut 603 facilitate the locking of the first support plate 604 by the operator. The fastening nut 603 is a wing nut, which makes it easy for the operator to tighten it by hand. To tighten or loosen, a limiting through groove 602 is provided on the rear side of the upper end face of the adjusting frame 400, and the limiting through groove 602 matches the vertical screw 607. The limiting through groove 602 is connected to the limiting groove 617 located on the rear side of the inner wall of the adjusting frame 400. The limiting through groove 602 facilitates the lateral movement of the vertical screw 607 inside the adjusting frame 400. An internal threaded through hole 6012 is provided on the outer side of the mounting sleeve 601. A locking screw 6011 is installed inside the internal threaded through hole 6012. The internal threaded through hole 6012 and the locking screw 6011 can fix the transducer 300 inserted inside the mounting sleeve 601. The locking screw 6011 is a wing screw, which makes it easy for workers to tighten or loosen it by hand.

[0042] In a further embodiment of this utility model, the counterweight assembly 500 includes counterweight blocks 502 and placement slots 503. Placement slots 503 are symmetrically provided on the left and right sides of the upper surface of the adjusting frame 400. The placement slots 503 facilitate workers to place multiple counterweight blocks 502 on the left and right sides of the upper surface of the adjusting frame 400 for use. Multiple counterweight blocks 502 are placed inside the placement slots 503. All counterweight blocks 502 are made of steel. After the multiple steel counterweight blocks 502 are placed into the placement slots 503... This further increases the weight of the adjustment frame 400, allowing it to apply downward pressure to the two sets of transducers 300, ensuring that the bottoms of the two sets of transducers 300 are in full contact with the surface of the concrete bridge slab. This ensures the stability of the ultrasonic wave propagation path and avoids sound energy loss or signal distortion due to air gaps. The upper end of the counterweight 502 is equipped with a pinch head 501, which is an integral structure with the counterweight 502. The pinch head 501 makes it convenient for workers to pick up the counterweight 502 by hand.

[0043] By symmetrically placing multiple counterweights 502 in the placement slots 503 on the left and right sides of the upper end face of the adjusting frame 400, the multiple counterweights 502 can further apply downward pressure to the adjusting frame 400. The adjusting frame 400 will further apply downward pressure to the two sets of transducers 300 through the first support plate 604, the second support plate 605 and the mounting sleeve 601, so that the transducers 300 with the coupling agent coated on the bottom can fully contact the surface of the concrete bridge slab, thereby ensuring the stability of the ultrasonic wave propagation path and avoiding sound energy loss or signal distortion due to air gaps.

[0044] Working Principle: Before using this device to detect the depth of cracks in external concrete bridges, the operator first loosens the fastening nut 603 by hand. This allows the first support plate 604 to be moved left and right. During this process, when the first support plate 604 moves the transducer 300 on the right side inward via the mounting sleeve 601, the first support plate 604 drives the transmission gear 613 to rotate clockwise (this clockwise rotation is viewed from the front) via the first extension plate 614 and the first rack 611. The clockwise rotation of the transmission gear 613 drives the second rack 609 to move to the right, causing the second rack 609 to drive the second support plate 605 to move inward synchronously via the second extension plate 608. The second support plate 605 will move the transducer 300 on the left side inward synchronously through the installation sleeve 601. Similarly, when the first support plate 604 is moved outward, the second support plate 605 will move the transducer 300 on the left side outward synchronously. This allows the staff to adjust the spacing between the two sets of transducers 300 according to the width of the crack. After the spacing between the two sets of transducers 300 is adjusted, the fastening nut 603 is tightened, which allows the fastening nut 603 and the vertical screw 607 to position the first support plate 604. The locked first support plate 604 can also prevent the second support plate 605 from continuing to move, thus ensuring the stability of the use of the first support plate 604 and the second support plate 605.

[0045] Next, evenly apply a coupling agent (such as petroleum jelly, butter, etc.) to the bottom of both sets of transducers 300. After application, use the adjusting frame 400 to vertically place the two sets of transducers 300 at the desired positions on both sides of the crack. After placement, use the pinch head 501 to symmetrically place multiple counterweights 502 into the placement slots 503 on the left and right sides of the upper end face of the adjusting frame 400 (see reference). Figure 1 This causes multiple counterweights 502 to further apply downward pressure to the adjusting frame 400, which in turn applies downward pressure to the two sets of transducers 300 through the first support plate 604, the second support plate 605, and the mounting sleeve 601. This ensures that the transducers 300, with coupling agent applied to their bottoms, can fully contact the surface of the concrete bridge slab, thereby ensuring the stability of the ultrasonic wave propagation path and avoiding sound energy loss or signal distortion due to air gaps. Then, the operator only needs to start the crack depth tester body 100 to check the crack depth of the concrete bridge slab through the connecting line 200 and the two sets of transducers 300.

[0046] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A device for detecting the crack depth of concrete bridges, comprising a crack depth tester body (100), a connecting line (200), a transducer (300), and an adjustment frame (400), characterized in that: The transducer (300) has two sets, and the two sets of transducers (300) are electrically connected to the crack depth tester body (100) through the connecting line (200). The adjustment frame (400) is placed in front of the crack depth tester body (100). An adjustment component (600) is provided between the adjustment frame (400) and the transducer (300), and the adjustment component (600) is used to adjust and support the distance between the two sets of transducers (300). Counterweight components (500) are symmetrically arranged on the left and right sides of the upper end face of the adjustment frame (400). The adjustment assembly (600) includes two mounting sleeves (601), a first support plate (604) and a second support plate (605) slidably disposed inside the adjustment frame (400) and arranged at intervals. The two mounting sleeves (601) are respectively fixed on the first support plate (604) and the second support plate (605). The transducer (300) is assembled inside the mounting sleeve (601) and extends through the first support plate (604) and the second support plate (605) to the lower bottom of the adjustment frame (400). A linkage mechanism is provided between the first support plate (604) and the second support plate (605) to adjust the distance between the first support plate (604) and the second support plate (605).

2. The concrete bridge crack depth detection device according to claim 1, characterized in that, The linkage mechanism includes a first extension plate (614), a first rack (611), a second extension plate (608), a second rack (609), a support shaft (612), and a transmission gear (613). The first support plate (604) is connected to the first rack (611) through the first extension plate (614). The second support plate (605) is connected to the second rack (609) through the second extension plate (608). The adjustment frame (400) is equipped with the transmission gear (613) through the support shaft (612). The first rack (611) and the second rack (609) are parallel and mesh with each other through the transmission gear (613).

3. The concrete bridge crack depth detection device according to claim 2, characterized in that, The first extension piece (614) is disposed on the lower side of the front end face of the first support plate (604), the first rack (611) is fixed on the front side of the upper end face of the first extension piece (614), the right side of the front end face of the adjustment frame (400) is provided with a first through groove (616), and the first through groove (616) matches the first extension piece (614) so ​​that the first extension piece (614) and the first rack (611) extend out of the front end face of the adjustment frame (400); the second extension piece (608) is installed on the upper side of the front end face of the second support plate (605), the second rack (609) is installed on the front side of the lower end face of the second extension piece (608), the left side of the front end face of the adjustment frame (400) is provided with a second through groove (615), and the second through groove (615) matches the second extension piece (608) so that the second rack (609) and the second extension piece (608) extend out of the front end face of the adjustment frame (400).

4. The concrete bridge crack depth detection device according to claim 3, characterized in that, The front end face of the adjustment frame (400) is equipped with a protective cover (606), which covers the outside of the first extension piece (614), the first rack (611), the second extension piece (608), the second rack (609), the support shaft (612), and the transmission gear (613).

5. The concrete bridge crack depth detection device according to claim 1, characterized in that, The counterweight assembly (500) includes counterweight blocks (502) and placement slots (503). There are two sets of placement slots (503) respectively located on the left and right sides of the upper end face of the adjustment frame (400). Multiple counterweight blocks (502) are placed inside the placement slots (503).

6. The concrete bridge crack depth detection device according to claim 5, characterized in that, The upper end of the counterweight (502) is provided with a pinch head (501).

7. The concrete bridge crack depth detection device according to claim 1, characterized in that, The adjusting frame (400) has symmetrically provided limiting grooves (617) on the front and rear sides of its inner wall, and the limiting grooves (617) are respectively matched with the first support plate (604) and the second support plate (605) to achieve sliding fit.

8. The concrete bridge crack depth detection device according to claim 1, characterized in that, The left and right ends of the adjustment frame (400) are symmetrically and fixedly connected with handles (401).

9. The concrete bridge crack depth detection device according to claim 1, characterized in that, A vertical screw (607) is provided on the rear side of the upper end face of the first support plate (604). A fastening nut (603) is threaded on the upper side of the annular side of the vertical screw (607). A limiting groove (602) is provided on the rear side of the upper end face of the adjusting frame (400), and the limiting groove (602) matches the vertical screw (607).

10. The concrete bridge crack depth detection device according to claim 1, characterized in that, The mounting sleeve (601) has an internally threaded through hole (6012) on its outer side. A locking screw (6011) is installed inside the internally threaded through hole (6012) to fasten or loosen the transducer (300) inside the mounting sleeve (601).

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