Concrete crack detection device

Abstract

The utility model discloses a concrete crack detection device. The concrete crack detection device comprises a crack depth detector, a transducer and a transducer positioning bracket, the transducer positioning bracket comprises a central positioning seat, a sliding rod, two positioning sliding blocks and a horizontal ruler; an elastic telescopic positioning pin is arranged in the center of the bottom of the center positioning seat; the sliding rods are fixedly arranged on the central positioning seat in a penetrating manner and are symmetrically distributed relative to the positioning needle; wherein one positioning sliding block is connected to the sliding rod on one side of the center positioning seat in a sliding mode, and the other positioning sliding block is connected to the sliding rod on the other side of the center positioning seat in a sliding mode. Each positioning sliding block is provided with a transducer, and the two transducers are electrically connected with the crack depth detector. Length scales are arranged on the sliding rod; and the horizontal ruler is fixedly connected to the central positioning seat. According to the utility model, the crack center can be quickly positioned, the distance between the transducers can be accurately adjusted, and the measurement deviation can be reduced; and a steel ruler paintbrush is not needed to measure distance marks in the operation process, so that the operation is more convenient.

Description

Technical Field

[0001] This utility model relates to the field of concrete testing instruments, and in particular to a concrete crack detection device. Background Technology

[0002] In many infrastructure projects such as dams and bridges, concrete components, especially large-volume concrete structures, frequently develop cracks on their surfaces due to various reasons. To ensure the safety of the engineering structure, it is often necessary to conduct detailed investigations and measurements of these cracks to provide objective basis for assessment and treatment. In particular, the depth of crack development directly affects the quality and safety performance of the components. Currently, the commonly used method for crack depth detection, which is also required by relevant standards and specifications, is ultrasonic testing. When there is only one measurable surface at the crack location in the structure, a single-sided flat measurement method is generally used. The testing process requires both non-crossing and cross-crack testing. Taking cross-crack testing as an example, it is necessary to mark equidistant points on both sides of the crack detection point, and then use a handheld transducer to conduct tests at each location sequentially. Therefore, before the actual crack depth detection, it is necessary to use a steel ruler and marker to measure the distance at the test location on the component and make marks for transducer positioning. The accuracy of the distance between transducers directly affects the measurement results. Due to the presence of coupling agent between the transducer and the concrete surface, slight slippage may occur, causing the actual distance between the transducers to differ from the marked distance, resulting in deviations in the measurement results. Furthermore, this method of measuring distances and marking points with a steel ruler, and then finding observation points, is quite troublesome and time-consuming to operate on-site. Utility Model Content

[0003] This invention provides a concrete crack detection device that can quickly locate the center of the crack, accurately adjust the spacing of the transducers, and reduce the measurement result deviation caused by the transducer position deviation; moreover, the operation process does not require the use of a steel ruler or pen to measure distance and mark, making the operation more convenient.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0005] A concrete crack detection device includes a crack depth detector, a transducer, and a transducer positioning bracket. The transducer positioning bracket includes a central positioning seat, a sliding rod, two positioning sliders, and a level. A resiliently telescopic positioning pin is located at the center of the bottom of the central positioning seat. The sliding rod is fixedly mounted on the central positioning seat and symmetrically distributed with respect to the positioning pins. One positioning slider is slidably connected to the sliding rod on one side of the central positioning seat, and the other positioning slider is slidably connected to the sliding rod on the other side of the central positioning seat. Each positioning slider is equipped with a transducer, and the two transducers are electrically connected to the crack depth detector. The sliding rod has length graduations. The level is fixedly connected to the central positioning seat.

[0006] Furthermore, a handle is provided on the top of the central positioning seat; a support column is provided at each of the four corners of the bottom of the central positioning seat, and each support column is elastically telescopically connected to the bottom of the central positioning seat; a ring-shaped rubber pad is fixedly connected to the outer periphery of the bottom of the central positioning seat corresponding to each support column.

[0007] Furthermore, the number of sliding rods is set to two, and the central positioning seat has two horizontally penetrating mounting holes. The two mounting holes are arranged in parallel and spaced apart, and are symmetrically distributed with respect to the positioning seat. Each sliding rod is inserted into one of the mounting holes. The top of the central positioning seat has at least two threaded holes that penetrate into each mounting hole at the position corresponding to each mounting hole. Each threaded hole is distributed in the vertical direction, and each threaded hole is threadedly connected to a fixing bolt. The end of the fixing bolt abuts against the corresponding sliding rod.

[0008] Furthermore, both slide rods have length markings on their upper surfaces; both sides of the slide rods are symmetrically distributed with respect to the positioning pins; and both slide rods have a reinforcing rod fixedly connected to their ends.

[0009] Furthermore, each of the positioning sliders is provided with two transversely penetrating sliding holes, the sliding holes matching the shape of the sliding rod; each of the positioning sliders is provided with a positioning knob on one side, the positioning knob being threadedly connected to the positioning slider, and its end penetrating into the sliding hole and abutting against the sliding rod; the center of the positioning slider is provided with a through transducer mounting hole; the transducer is fixedly inserted into the transducer mounting hole, the bottom of the two transducers being flush with the lower end face of the rubber pad; the axis of the two transducers and the axis of the positioning pin are located on the same plane.

[0010] Furthermore, the level is a bubble level, which is fixedly connected to one side of the central positioning seat.

[0011] Furthermore, the bottom of the positioning pin has a conical tip.

[0012] Furthermore, the concrete crack detection device also includes an L-shaped support plate. The back of the vertical end of the L-shaped support plate is provided with a waist fixing strap and a neck rope. The upper surface of the horizontal end of the L-shaped support plate is fixedly connected with two spaced-apart baffles. The crack depth detector is arranged between the two baffles.

[0013] The beneficial effects of this utility model are:

[0014] 1) This utility model can precisely adjust the spacing of the transducers by sliding the positioning slider and the scale on the slider rod, and perform multiple depth measurements at different spacings; it can reduce the measurement result deviation caused by transducer position deviation; and the operation process does not require the use of a steel ruler or pen to measure distance marks, making the operation more convenient.

[0015] 2) The handle helps the operator firmly grip the center positioning seat, while the bottom is equipped with an elastic telescopic support column. After the leveling is adjusted, the operator can directly press the support column onto the measuring plane, and the support column will retract accordingly. The rubber pads around the support column form a support surface, which can prevent relative displacement. When a secondary adjustment of the transducer spacing is required, the clamping force of the center positioning seat can be slightly adjusted to make the bottom of the transducer detach from the measuring plane. At this time, the support column provides a certain support force, while preventing relative displacement of the center positioning seat, which facilitates the adjustment of the spacing of the positioning slider.

[0016] 3) The bottom of the positioning pin is a conical tip. The center of the crack can be quickly determined by inserting the tip into the gap.

[0017] 4) The waist support belt suspends the L-shaped support plate around the operator's waist, and the neck strap is attached to the operator's neck to prevent the L-shaped support plate from slipping. The crack depth detector is placed between the two guards, freeing up the operator's hands. In the past, crack detection required two people, one to operate the crack depth detector and the other to hold the transducer. The L-shaped support plate can support the crack depth detector, freeing up the operator's hands. The operator can operate the transducer positioning bracket with one hand and operate the crack depth detector with the other, reducing manpower input. Attached Figure Description

[0018] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings, wherein:

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0020] Figure 2 This is a structural schematic diagram of the transducer positioning bracket in this utility model from an elevation perspective;

[0021] Figure 3 This is a structural schematic diagram of the transducer positioning bracket from a side view in this utility model;

[0022] Figure 4 This is a schematic diagram of the internal structure of the central positioning seat in this utility model;

[0023] Figure 5 This is a schematic diagram of the L-shaped tray in this utility model;

[0024] Attached image labels:

[0025] 1—Crack depth detector, 2—Transducer, 3—Transducer positioning bracket, 4—L-shaped support plate, 31—Center positioning seat, 32—Slide rod, 33—Positioning slider, 34—Level, 311—Positioning pin, 312—Handle, 313—Support column, 314—Rubber pad, 315—Mounting hole, 316—Fixing bolt, 321—Reinforcing rod, 331—Positioning knob, 41—Waist fixing belt, 42—Neck strap, 43—Edge guard. Detailed Implementation

[0026] 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.

[0027] It should be noted that when a component is described as "fixed to" another component, it can be directly on the other component or may have a central component. When a component is described as "connected to" another component, it can be directly connected to the other component or may have a central component. When a component is described as "set on" another component, it can be directly set on the other component or may have a central component. When a component is described as "set in the middle," it is not simply set in the exact center, as long as it is not set within the area defined by both ends being in the middle. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0029] Reference Figures 1 to 5As shown, a concrete crack detection device includes a crack depth detector 1, a transducer 2, and a transducer positioning bracket 3. The transducer positioning bracket 3 includes a central positioning seat 31, a sliding rod 32, two positioning sliders 33, and a level 34. A resiliently telescopic positioning pin 311 is provided at the bottom center of the central positioning seat 31. The sliding rod 32 is fixedly mounted on the central positioning seat 1 and symmetrically distributed with the positioning pins 311. One of the positioning sliders 33 is slidably connected to the sliding rod 32 on one side of the central positioning seat 31, and the other positioning slider 33 is slidably connected to the sliding rod 32 on the other side of the central positioning seat 31. Each positioning slider 33 is equipped with a transducer 2, and the two transducers 2 are electrically connected to the crack depth detector 1. The sliding rod 32 is provided with a length scale. The level 34 is fixedly connected to the central positioning seat 31. During the cross-crack inspection, the operator can pre-adjust the initial distance between the two positioning sliders 33 and apply coupling agent to the bottom of the two transducers 2. After selecting the crack location, the operator holds the central positioning seat 31 with one hand and inserts the positioning needle 311 into the crack to quickly locate the crack center. The second step is to observe the horizontal position of the central positioning seat 31 and the sliding rod 32 using a level 34. Maintaining the horizontal position, the operator presses the central positioning seat 31 against the measuring plane so that the bottom of the central positioning seat 31 is in contact with the measuring plane. At this time, the transducers 2 are evenly distributed on both sides of the crack and are in contact with the measuring plane, allowing for the first depth measurement. Keeping the position of the central positioning seat 31 unchanged, the operator slightly loosens the central positioning seat 31, but ensures that the positioning needle 311 does not detach from the crack. The distance between the transducers can be precisely adjusted by sliding the scale on the positioning slider 33 and the sliding rod 32. The operator continues to use the above steps to perform multiple depth measurements at different distances. The same operation is performed during the non-cross-crack inspection, the only difference being the selection point of the positioning needle 311. This invention can reduce the measurement result deviation caused by the position deviation of transducer 2; and the operation process does not require the use of a steel ruler or pen to measure distance marks, making the operation more convenient.

[0030] In this embodiment, to facilitate a firm grip on the central positioning seat 31, a handle 312 is provided on the top of the central positioning seat 31. The handle 312 has a U-shaped structure, and both ends of the U-shape of the handle 312 are fixedly connected to the top of the central positioning seat 31. When inspecting cracks in a vertical wall, after the positioning needle 311 has selected a point, it is necessary to adjust and maintain a horizontal state, which requires a high degree of hand stability from the operator. Therefore, this utility model provides a support column 313 at each of the four corners of the bottom of the central positioning seat 31. Each support column 313 is elastically telescopically connected to the bottom of the central positioning seat 31, so that after the operator selects a point using the positioning needle 311, they can directly press it against the measuring plane, so that the support column 313 abuts against the measuring plane, providing support when adjusting the horizontal state. A ring-shaped rubber pad 314 is fixedly connected to the outer periphery of each support column 313 at the bottom of the central positioning seat 31. After the horizontal state is adjusted, the operator can directly press it against the measuring plane, and the rubber pad forms a support surface to prevent relative displacement. When a secondary adjustment of the spacing of transducers 2 is required, the clamping force of the central positioning seat can be slightly adjusted so that the bottom of transducers 2 is removed from the measuring plane. At this time, four support columns 313 form a certain supporting force, while avoiding relative displacement of the central positioning seat, which facilitates adjustment of the spacing of the positioning sliders 33.

[0031] The number of sliding rods 32 is set to two. The central positioning seat 31 has two horizontally penetrating mounting holes 315. The two mounting holes 315 are arranged in parallel and spaced apart, and symmetrically distributed with the positioning pins 311. Each sliding rod 32 is inserted into one of the mounting holes 315. The top of the central positioning seat 31 has at least two threaded holes penetrating into each mounting hole 315. Each threaded hole is distributed in the vertical direction and is threadedly connected to a fixing bolt 316. The end of the fixing bolt 316 abuts against the corresponding sliding rod 32. In this embodiment, each sliding rod 32 is provided with two fixing bolts 316, symmetrically distributed with the handle 312 as the center, and the positions of the two sliding rods 32 are fixed by the fixing bolts 316. Both slide rods 32 have length markings on their upper surfaces; both sides of the slide rods 32 are symmetrically distributed with the positioning pins 311, that is, before fixing the position of the slide rods 32, the positioning pins 311 need to be calibrated until the vertical feet of the two slide rods 31 are at the center of the markings; a reinforcing rod 321 is fixedly connected to the ends of both slide rods 32, the reinforcing rod 321 is used to stabilize the position of the two slide rods 32 and reduce the risk of bending. Each positioning slider 33 has two transversely penetrating sliding holes, the shapes of which match those of the sliding rods 32. Each positioning slider 33 has a positioning knob 331 on one side, which is threadedly connected to the positioning slider 33 and extends through the sliding holes to abut against the sliding rods 32. A transducer mounting hole is provided at the center of each positioning slider 33. The transducer 2 is fixedly inserted into the transducer mounting hole, protruding between the two sliding rods 32. The bottoms of the two transducers 33 are flush with the lower end face of the rubber pad 314. The axes of the two transducers 2 and the axis of the positioning pin 311 are located on the same plane, which is parallel to the two sliding rods 33.

[0032] The level 34 is a bubble level, which is fixedly connected to one side of the central positioning seat 31.

[0033] The bottom of the positioning pin 311 has a conical tip. Inserting the tip into the gap allows for quick determination of the crack's center position. A positioning hole is vertically formed at the bottom center of the central positioning seat 31. A stepped outer diameter ring is formed at the top of the positioning pin 311, which slides smoothly within the positioning hole. A spring at the top allows for elastic expansion and contraction with the positioning hole. The opening of the positioning hole is closed by a cap, which has a corresponding clearance hole for the positioning pin 311 to pass through. Similarly, the elastic expansion and contraction connection between the support column 313 and the central positioning seat 31 can also be achieved in a similar manner. This elastic expansion and contraction connection structure is already disclosed in the prior art and will not be elaborated upon here.

[0034] This embodiment also includes an L-shaped support plate 4. The vertical end of the L-shaped support plate 4 has a waist fixing strap 41 and a neck strap 42 on its back. Two spaced-apart side panels 43 are fixedly connected to the upper surface of the horizontal end of the L-shaped support plate 4. The crack depth detector 1 is positioned between the two side panels 43. The waist fixing strap 41 has a buckle and adjustable length. Both ends of the waist fixing strap 41 are fixedly connected to the sides of the vertical end of the L-shaped support plate 4. The neck strap 42 is also adjustable in length, and both ends are connected to the top side of the vertical end of the L-shaped support plate 4. The waist support belt 41 secures the L-shaped support plate 4 to the operator's waist, and the neck strap 42 hangs around the operator's neck to prevent the L-shaped support plate 4 from slipping. The crack depth detector 1 is positioned between the two side panels 43, freeing up the operator's hands. Previously, crack detection required two people: one to operate the crack depth detector 1 and the other to hold the transducer 2. With the L-shaped support plate 4 supporting the crack depth detector 1, the operator can free up their hands. The operator can operate the transducer positioning bracket 3 with one hand and the crack depth detector 1 with the other, reducing manpower input.

[0035] The above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Any modifications or equivalent substitutions that do not depart from the spirit and scope of this utility model should be covered within the scope of the technical solution of this utility model.

Claims

1. A concrete crack detection apparatus comprising a crack depth detector and a transducer, characterized in that, The device further comprises a transducer positioning support; the transducer positioning support comprises a center positioning seat, a slide rod, two positioning sliders and a level; a resiliently retractable positioning needle is arranged at the center position of the bottom of the center positioning seat; the slide rod is fixedly arranged on the center positioning seat and symmetrically distributed with the positioning needle; one of the positioning sliders is slidably connected to the slide rod on one side of the center positioning seat, and the other positioning slider is slidably connected to the slide rod on the other side of the center positioning seat; a transducer is arranged on each of the positioning sliders; the two transducers are electrically connected to the crack depth detector; a length scale is arranged on the slide rod; and the level is fixedly connected to the center positioning seat.

2. The concrete crack detection apparatus of claim 1, wherein A handle is arranged at the top of the center positioning seat; a support column is arranged at each of the four corners of the bottom of the center positioning seat, and each of the support columns is resiliently retractably connected to the bottom of the center positioning seat; and a ring-shaped rubber pad is fixedly connected to the outer circumferential side of the center positioning seat corresponding to each of the support columns.

3. The concrete crack detection apparatus of claim 2, wherein The number of the slide rods is two; the center positioning seat is provided with two transversely penetrating mounting holes which are parallel and spaced apart and symmetrically distributed with the positioning needles; each of the slide rods is inserted into one of the mounting holes; at least two threaded holes penetrating into the mounting hole are arranged at the top of the center positioning seat corresponding to each of the mounting holes; each of the threaded holes is distributed in a vertical direction; each of the threaded holes is threadedly connected with a fixing bolt; and the end of the fixing bolt abuts against the corresponding slide rod.

4. The concrete crack detection apparatus of claim 3, wherein The upper end surface of each of the slide rods is provided with a length scale; the two sides of each of the slide rods are symmetrically distributed with the positioning needles; and a reinforcing rod is fixedly connected to the end of each of the slide rods.

5. The concrete crack detection apparatus of claim 3, wherein Each of the positioning sliders is provided with two transversely penetrating slide holes which are matched with the slide rods in shape; one side of each of the positioning sliders is provided with a positioning knob which is threadedly connected with the positioning slider and has an end penetrating into the slide hole and abutting against the slide rod; the center of each of the positioning sliders is provided with a transversely penetrating transducer mounting hole; the transducer is fixedly inserted into the transducer mounting hole; the bottom of each of the transducers is flush with the lower end surface of the rubber pad; and the axis of each of the transducers is located in the same plane as the axis of the positioning needle.

6. The concrete crack detection apparatus of claim 1, wherein The level is a bubble level which is fixedly connected to one side of the center positioning seat.

7. The concrete crack detection apparatus of claim 1, wherein The bottom of the positioning needle is a conical needle tip.

8. The concrete crack detection apparatus of claim 1, wherein, The device further comprises an L-shaped supporting plate; the vertical end of the L-shaped supporting plate is provided with a waist fixing belt and a neck hanging rope; the upper end surface of the horizontal end of the L-shaped supporting plate is fixedly connected with two spaced-apart flanges; and the crack depth detector is arranged between the two flanges.

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