Concrete Crack Width Development Testing Device

Abstract

This invention discloses a concrete crack width development testing device, relating to the field of concrete crack width measurement technology. The device includes a testing apparatus and a concrete slab to be tested, as well as signal receiving components. At least three signal receiving components are provided, each connected to a first multi-channel wire between itself and the signal input terminal of the testing apparatus. By using a signal generating component to disperse stress waves within space, and with multiple signal receiving components, gravitational waves can be received from multiple directions and angles, thereby increasing the in-plane concrete crack detection range and providing an effective basis for tracing the root cause of crack development. Furthermore, since the distance between each signal receiving component and the signal generating component is equidistant, the wavebands displayed on the oscilloscope provide a more comparative effect, which is beneficial for concrete crack analysis.

Description

Technical Field

[0001] This invention relates to the field of concrete crack width measurement technology, specifically to a concrete crack width development testing device. Background Technology

[0002] In civil engineering, concrete structures dominate. Concrete cracks are physical structural changes caused by internal and external factors. Cracks are the main reason for the reduction in the load-bearing capacity, durability, and waterproofing of concrete structures. Therefore, concrete crack control technology plays a crucial role in the construction process. To control concrete cracks, it is necessary to analyze the development of cracks. Currently, most crack development monitoring equipment on the market is designed for cracks on the concrete surface.

[0003] For example, Chinese patent CN114199485A discloses a device for detecting concrete cracks at the bottom of a bridge. This device can change the orientation, height, and horizontal position of the entire support arm by loosening or tightening one of the traction ropes, so that the camera can capture the entire bottom of the bridge. However, this technology can often only target surface cracks in concrete. Because surface cracks in concrete have a certain lag, their evaluation value is lower than that of internal cracks in concrete.

[0004] With the development of technology, some devices that use ultrasound to measure internal cracks in concrete have appeared on the market. However, ultrasound is often affected by noise in outdoor environments, which leads to a decrease in measurement accuracy. In addition, the signal trigger frequency of traditional ultrasonic testing equipment is a fixed value, which makes it inconvenient to adjust the center frequency of the excitation signal in real time, making it difficult to accurately identify defects of different scales.

[0005] To address this, Chinese patent CN109696117B discloses a system for monitoring internal cracks in cement pavement and a method for determining crack width and location. This method utilizes the integrated sensing and driving capabilities of smart aggregates to transmit and receive signals, and uses the changes in input and output signals to diagnose hidden cracks in cement pavement. However, in practical applications, this method often only allows the smart aggregates to sense stress waves in a single direction, thus achieving the perception of stress waves in a plane, and cannot perceive stress waves from a three-dimensional perspective.

[0006] Chinese patent CN116413335A discloses a monitoring device for concrete structures of roads and bridges. The device generates a detection signal through a signal generation module, amplifies and modulates it through a signal amplification module, and then applies it to a first piezoelectric sensing component through a signal transmission module. A second piezoelectric sensing component receives the signal carrying damage information and transmits it to a signal receiving module in a monitoring and display device. The monitoring and display device extracts and analyzes the damage scattering signal caused by crack defects, providing a data source for imaging damage to reinforced concrete structures and realizing rapid and accurate monitoring of concrete structures.

[0007] However, the above method can only measure the concrete located between the first and second piezoelectric sensing components when measuring internal cracks in concrete. When cracks appear inside the concrete to be measured, especially cracks with large width, length and depth, it is often impossible to completely detect the source of the crack, which can easily lead to errors in the analysis of crack development. In addition, multiple detections are required, which affects the measurement efficiency. Summary of the Invention

[0008] To address the shortcomings of existing technologies, this invention provides a concrete crack width development testing device, which solves the problems mentioned in the background art.

[0009] To achieve the above objectives, the present invention provides the following technical solution: a concrete crack width development testing device, comprising a testing device and a concrete slab to be tested, and further comprising signal receiving components, wherein there are at least three signal receiving components, and each signal receiving component is provided with a first multi-channel wire between itself and the signal input terminal of the testing device, wherein a first multi-channel plug is installed at one end of the first multi-channel wire connected to the signal receiving component, and a positioning pointer is provided on the outside of the first multi-channel plug; a signal generating component, wherein a second multi-channel wire is provided between itself and the signal output terminal of the testing device, wherein a second multi-channel plug is installed at one end of the second multi-channel wire connected to the signal generating component; a first implantation hole, wherein the first implantation hole is located within the concrete slab for implanting the signal receiving component, and the line connecting two adjacent first implantation holes in the plane forms a regular polygon; and a second implantation hole, wherein the second implantation hole is located within the concrete slab for implanting the signal generating component, and the second implantation hole is located at the center of the regular polygon.

[0010] Furthermore, the testing equipment includes a housing, a cover hinged to one side of the housing, a working computer located inside the cover, and an oscilloscope electrically connected to one side of the working computer; a signal generator located inside the housing, with its signal input terminal electrically connected to the working computer and its signal output terminal electrically connected to a voltage amplifier, the output terminal of which is electrically connected to a second multi-channel wire; and a signal analyzer located inside the housing, with its signal output terminal electrically connected to the signal input terminal of the working computer and its signal input terminal electrically connected to a signal acquisition device, which is electrically connected to a first multi-channel wire.

[0011] Furthermore, the signal generating component comprises three parts: a second encapsulation post, a second piezoelectric ceramic, and a second multi-channel socket. The second piezoelectric ceramic has a spherical structure and there are at least two of them. The outer side of the second piezoelectric ceramic is encapsulated with epoxy resin to form a cylindrical second encapsulation post. The upper end of the second encapsulation post is provided with a second multi-channel socket. The second multi-channel socket is plugged into a second multi-channel plug and is electrically connected to the second multi-channel plug. The second multi-channel socket is individually electrically connected to each of the second piezoelectric ceramics via a wire. The signal receiving component comprises three parts: a first encapsulation post, a first piezoelectric ceramic, and a first multi-channel socket. The number of first piezoelectric ceramics is the same as that of the second piezoelectric ceramics. The outer side of the first piezoelectric ceramic is encapsulated with epoxy resin to form a cylindrical first encapsulation post. The upper end of the first encapsulation post is provided with a first multi-channel socket. The first multi-channel socket is plugged into a first multi-channel plug and is electrically connected to the first multi-channel plug. The first multi-channel socket is individually electrically connected to each of the first piezoelectric ceramics via a wire.

[0012] Furthermore, the first piezoelectric ceramic has an arc-shaped structure, and the first piezoelectric ceramic has a minor arc. The line connecting the midpoint of the arc in the plane of the first piezoelectric ceramic to its center is parallel to the second multi-channel wire and both point to the center of the second piezoelectric ceramic sphere.

[0013] Furthermore, the first piezoelectric ceramic has a rectangular structure, and the line connecting the center of the first piezoelectric ceramic and the center of the second piezoelectric ceramic sphere is parallel to the positioning pointer.

[0014] Furthermore, the enclosure contains an equipment compartment, which houses a battery. A support plate is fixed inside the equipment compartment near the top, and the support plate is used to support a signal acquisition device, a signal generator, a signal analyzer, and a voltage amplifier.

[0015] Furthermore, the housing is equipped with heat dissipation components on both sides of the equipment compartment. These heat dissipation components include: heat dissipation chambers located on both sides of the equipment compartment, with a first partition fixed to the top of each chamber; a first cooling fan mounted on one of the first partitions, and a second cooling fan mounted on the other; a heat-conducting plate located within the equipment compartment, between the support plate and the battery; heat sinks evenly mounted on the upper surface of the heat-conducting plate; the upper ends of the heat sinks abutting against the lower surface of the support plate; and thermal grease between the lower surface of the heat sinks and the battery; and a ventilation opening located at the connection between the equipment compartment and the heat dissipation chambers.

[0016] Furthermore, the outer side of the box is symmetrically fixed with fasteners away from the hinge end, and the box cover is symmetrically installed with latches that are adapted to the fasteners one by one.

[0017] Furthermore, the outer side of the box is also provided with a handle, which is a component made of PP material.

[0018] Furthermore, a toolbox is provided near one end of the housing, which is used to hold the first multi-channel wire, the second multi-channel wire, the signal receiving component, and the signal generating component.

[0019] The present invention has the following beneficial effects: (1) The concrete crack width development test device enables stress waves to be dispersed and transmitted in space through the signal generating component. With the setting of multiple signal receiving components, it realizes the reception of gravitational waves in multiple directions and angles, thereby improving the detection range of concrete cracks in the plane and providing an effective basis for tracing the root cause of crack development. In addition, since the distance between each signal receiving component and the signal generating component is the same, the waveband displayed by the oscilloscope has a better comparative effect, which is beneficial to the analysis of concrete cracks.

[0020] (2) The concrete crack width development test device facilitates the rapid installation of the signal generation component by setting the positioning pointer, so as to ensure that the sensing surface of the first piezoelectric ceramic is facing the second piezoelectric ceramic, thereby improving the signal reception effect and improving the concrete crack detection efficiency.

[0021] (3) The concrete crack width development test device facilitates the quick installation and removal of the signal receiving component through the connection between the first multi-channel plug and the first multi-channel socket, and facilitates the quick installation and removal of the signal generating component through the connection between the second multi-channel plug and the second multi-channel socket. This facilitates the grouting and sealing of the first and second implantation holes after concrete crack detection, thereby reducing damage to the concrete and facilitating the recycling and reuse of the first and second multi-channel plugs, thus reducing resource waste.

[0022] (4) The concrete crack width development test device uses multiple spherical second piezoelectric ceramics to form a columnar signal generation component, which can enhance the excitation signal and make the propagation of stress waves more dispersed in space, which is conducive to detecting defects at different locations and realizing damage imaging.

[0023] (5) The concrete crack width development test device sends a trigger signal to the signal generator through the working computer, and the amplified signal is input to the signal generating component through the voltage amplifier. The signal generating component generates a high-frequency stress wave, which is sensed by the signal receiving component, generating an induced signal and transmitting it to the signal acquisition unit. The signal acquisition unit sends the acquired induced signal to the signal analyzer to realize the preliminary analysis of the induced signal, and further transmits it to the working computer for storage and analysis. Finally, the induced signal is displayed through the oscilloscope and compared with the signal emitted by the signal generator to realize the analysis of the crack location.

[0024] (6) The concrete crack width development test device, through the setting of the box and the box cover, can carry the working computer, oscilloscope, signal acquisition device, signal generator, signal analyzer, voltage amplifier and other equipment, so as to facilitate the external carrying of the device, thereby providing convenience for the detection of outdoor concrete components. The setting of heat dissipation components reduces the temperature of the device during use, thereby reducing the aging rate of the internal electrical parts of the device and extending the service life of the equipment.

[0025] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the structure of the box body and the box lid after hinges are applied in this invention; Figure 3 This is a schematic diagram of the internal structure of the box in this invention; Figure 4 In this invention Figure 3 The main view; Figure 5 This is a schematic diagram of the signal generation component in this invention; Figure 6 This is a schematic diagram of the internal structure of the signal receiving component of the first piezoelectric ceramic with an arc-shaped structure according to the present invention; Figure 7 This is a schematic diagram of the structure of the signal receiving component and the signal generating component arranged on a concrete slab in this invention; Figure 8 This is a schematic diagram of in-plane gravitational wave reception when the first piezoelectric ceramic with an arc-shaped structure is used as a signal receiving component according to the present invention; Figure 9 This is a flowchart illustrating the working principle of the present invention; Figure 10 This is a schematic diagram of the internal structure of the signal receiving component of the first piezoelectric ceramic with a rectangular structure according to the present invention; Figure 11 This is a schematic diagram of in-plane gravitational wave reception when the first piezoelectric ceramic with a rectangular structure is used as a signal receiving component according to the present invention. Figure 12 This is a plan view showing the arrangement of the signal receiving component and the signal generating component based on a regular quadrilateral during the partition detection of this invention. Figure 13 This is a plan view showing the arrangement of the signal receiving component and the signal generating component based on a regular hexagon during the partition detection of this invention.

[0027] In the diagram, 1. Cabinet; 2. Cabinet lid; 3. Work computer; 4. Oscilloscope; 5. Latch; 6. Fixing buckle; 7. Toolbox; 8. First partition; 9. First cooling fan; 10. Second cooling fan; 11. Signal acquisition unit; 12. Signal generator; 13. Signal analyzer; 14. Voltage amplifier; 15. First multi-channel cable; 16. First multi-channel plug; 17. Signal receiving component; 171. First encapsulation post; 172. First piezoelectric ceramic. 173. First multi-channel socket; 18. Second multi-channel wire; 19. Second multi-channel plug; 20. Signal generating component; 201. Second encapsulation post; 202. Second piezoelectric ceramic; 203. Second multi-channel socket; 21. Equipment compartment; 22. Battery; 23. Heat dissipation cavity; 24. Heat-conducting plate; 25. Heat sink; 26. Vent; 27. Support plate; 28. Positioning pointer; 29. ​​Concrete slab; 30. First implantation hole; 31. Second implantation hole. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] In the description of this invention, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inner", "around", etc., which indicate orientation or positional relationship, are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting this invention.

[0030] Example 1: Please see Figures 1-9 This invention provides a technical solution: a concrete crack width development testing device, including a testing device and a concrete slab 29 to be tested, and further including signal receiving components 17, at least three signal receiving components 17, and a first multi-channel wire 15 is provided between the signal receiving components 17 and the signal input terminal of the testing device, a first multi-channel plug 16 is installed at one end of the first multi-channel wire 15 connected to the signal receiving component 17, and a positioning pointer 28 is provided on the outside of the first multi-channel plug 16; a signal generating component 20, a second multi-channel wire 18 is provided between the signal generating component 20 and the signal output terminal of the testing device, and a second multi-channel plug 19 is installed at one end of the second multi-channel wire 18 connected to the signal generating component 20.

[0031] In this embodiment, the stress wave is dispersed and transmitted in space by the signal generating component 20. With the setting of multiple signal receiving components 17, the gravitational wave is received in multiple directions and angles, thereby improving the detection range of concrete cracks in the plane and providing an effective basis for tracing the root cause of crack development.

[0032] To facilitate the installation of the signal receiving component 17 and the signal generating component 20 on the concrete slab 29 to be tested, the concrete crack width development testing device provided in this embodiment further includes a first implantation hole 30, which is located inside the concrete slab 29 for implanting the signal receiving component 17, and the line connecting two adjacent first implantation holes 30 in the plane is a regular polygon; and a second implantation hole 31, which is located inside the concrete slab 29 for implanting the signal generating component 20, and the second implantation hole 31 is located at the center of the regular polygon.

[0033] In this embodiment, the signal receiving component 17 is implanted into the first implantation hole 30, and the signal generating component 20 is implanted into the second implantation hole 31. Concrete grout is poured into the first implantation hole 30 and the second implantation hole 31. After the concrete grout has solidified for 24 hours, the crack width development of the concrete slab 29 is detected. In this process, it is preferable that the concrete grout is made of the same or similar material as the concrete slab 29, with matching acoustic impedance, and weak reflection and strong transmission of stress waves at the interface. This is to facilitate the signal receiving component 17 to receive the signal and the signal generating component 20 to transmit the signal further, achieving detection over a larger area. In addition, it should be noted that the height of the concrete grout after pouring should be lower than the top of the first implantation hole 30 and the second implantation hole 31, and it should also be located below the top of the signal receiving component 17 and the top of the signal generating component 20, so as to facilitate the electrical connection between the subsequent testing equipment and the signal receiving component 17 and the signal generating component 20. Furthermore, since the distance between each signal receiving component 17 and the signal generating component 20 is the same, the signal band received by the signal receiving component 17 has a better contrast effect, which is beneficial to the analysis of concrete cracks.

[0034] It should be noted that the more sides the regular polygon formed by the signal receiving components 17 has, the smaller the included angle between two adjacent signal receiving components 17 will be, which in turn reduces the distance between two adjacent signal receiving components 17, thereby improving the accuracy of detection and making it easier and more accurate to detect the trend of cracks inside the concrete slab 29. However, in order to reduce the detection cost, it is preferable to have 3-6 signal receiving components 17, that is, the polygon formed by the signal receiving components 17 in the plane is an equilateral triangle, a regular quadrilateral, a regular pentagon, or a regular hexagon.

[0035] like Figure 1 and Figure 9 As shown, the testing equipment provided in this embodiment includes a housing 1 and a cover 2 hinged to one side of the housing 1. The hinge between the housing 1 and the cover 2 facilitates the carrying of this device, thereby providing convenience for the detection of outdoor concrete components. In addition, the testing equipment also includes a working computer 3, which is located inside the cover 2, and an oscilloscope 4 is electrically connected to one side of the working computer 3; a signal generator 12, which is located inside the housing 1, and the signal input terminal of the signal generator 12 is electrically connected to the working computer 3. In addition, the signal generator 12 can also be connected to the oscilloscope 4. Electrical connections are provided to facilitate the detection of the signal band of the signal generator 12 and the comparison between the emitted band and the subsequent received band. The signal output terminal of the signal generator 12 is electrically connected to a voltage amplifier 14, and the output terminal of the voltage amplifier 14 is electrically connected to a second multi-channel wire 18. The signal analyzer 13 is located inside the housing 1, and the signal output terminal of the signal analyzer 13 is electrically connected to the signal input terminal of the working computer 3. The signal input terminal of the signal analyzer 13 is electrically connected to a signal acquisition device 11, and the signal acquisition device 11 is electrically connected to a first multi-channel wire 15.

[0036] In this embodiment, a trigger signal is sent from the working computer 3 to the signal generator 12. The amplified signal is then input to the signal generating component 20 via the voltage amplifier 14 and the second multi-channel wire 18. The signal generating component 20 then generates a high-frequency stress wave. The high-frequency stress wave is sensed by the signal receiving component 17, generating an induction signal, which is transmitted to the signal acquisition unit 11 via the first multi-channel wire 15. The signal acquisition unit 11 sends the acquired induction signal to the signal analyzer 13 for preliminary analysis of the induction signal. The signal is then further transmitted to the working computer 3 for storage and analysis. Finally, the induction signal is displayed on the oscilloscope 4. During this process, the induction signal can be compared with the trigger signal sent by the signal generator 12, providing accurate data support for crack width development analysis and enabling crack location analysis.

[0037] like Figure 1 , Figure 5 and Figure 6As shown, the signal generating component 20 consists of three parts: a second encapsulation post 201, a second piezoelectric ceramic 202, and a second multi-channel socket 203. The second piezoelectric ceramic 202 has a spherical structure and at least two of them, which can enhance the excitation signal and disperse the propagation of stress waves in space, facilitating the detection of defects at different locations and the realization of damage imaging. In addition, the second piezoelectric ceramic 202 is encapsulated with epoxy resin to form a cylindrical second encapsulation post 201, which protects the second piezoelectric ceramic 202 and prevents damage to the second piezoelectric ceramic 202 during concrete pouring and hardening. It also serves as a waterproof and insulating element, improving signal transmission stability and enhancing the stability of the electrical connection between the signal generating component 20 and the second multi-channel wire 18. A second multi-channel socket 203 is provided at the upper end of the second encapsulation post 201. The second multi-channel socket 203 is plugged into the second multi-channel plug 19 to facilitate the installation and removal of the second multi-channel socket 203 and the second multi-channel plug 19. This facilitates the separation of the signal generating component 20 from the second multi-channel plug 19 after use, making it easier to recycle and reuse the second multi-channel plug 19 and reduce resource waste. The second multi-channel socket 203 is electrically connected to the second multi-channel plug 19 to realize the input of the trigger signal of the signal generating component 20. In addition, the second multi-channel socket 203 is individually electrically connected to each second piezoelectric ceramic 202 through a wire so that the trigger signal can be individually input to each second piezoelectric ceramic 202, providing a basis for crack width detection.

[0038] Furthermore, the signal receiving component 17 provided in this embodiment consists of three parts: a first encapsulation post 171, a first piezoelectric ceramic 172, and a first multi-channel socket 173. The number of first piezoelectric ceramics 172 is the same as that of second piezoelectric ceramics 202, so that the first piezoelectric ceramics 172 can sense the stress waves generated by the second piezoelectric ceramics 202. In addition, to improve the protection effect of the first piezoelectric ceramics 172, the first encapsulation post 171 is formed by encapsulating the outside of the first piezoelectric ceramics 172 with epoxy resin to avoid damage to the first piezoelectric ceramics 172 during the concrete pouring and hardening process. In addition, the first encapsulation post 171 also plays a role in waterproofing and insulation, improving the stability of signal reception and improving the stability of the electrical connection between the signal receiving component 17 and the first multi-channel wire 15. Qualitatively, a first multi-channel socket 173 is provided at the upper end of the first encapsulation post 171. The first multi-channel socket 173 is plugged into the first multi-channel plug 16 to facilitate the installation and removal of the first multi-channel socket 173 and the first multi-channel plug 16. This facilitates the separation of the signal receiving component 17 from the first multi-channel plug 16 after use, making it easier to recycle and reuse the first multi-channel plug 16 and reduce resource waste. The first multi-channel socket 173 is electrically connected to the first multi-channel plug 16 for the output of the sensing signal received by the signal receiving component 17. In addition, the first multi-channel socket 173 is individually electrically connected to each first piezoelectric ceramic 172 through a wire so that each first piezoelectric ceramic 172 can receive the sensing signal, providing a basis for crack width detection.

[0039] In this embodiment, it should be noted that piezoelectric ceramics have a significant effect in interface damage identification. Two methods are mainly used: stress wave-based and piezoelectric impedance-based. The stress wave-based method forms a transceiver mechanism by setting up an actuator and a sensor inside or on the surface of the structure. The actuator emits stress waves and the sensor receives them. Since interface damage causes attenuation and reflection of stress waves along the path, the signal received by the sensor is also changed. Thus, a connection between damage and signal change can be established. Based on this, we can detect the development of crack width inside the concrete slab 29 to be tested. Then, based on the sensing signal received by the signal receiving component 17, we can analyze and process it, and compare the energy, frequency, and amplitude of the trigger signal emitted by the signal generator 12 to accurately analyze information such as crack width and location.

[0040] like Figure 6 and Figure 8As shown, the first piezoelectric ceramic 172 provided in this embodiment has an arc-shaped structure, and the first piezoelectric ceramic 172 has a minor arc, so as to receive the sensing signal emitted by the signal generating component 20 more stably, improve the signal transmission distance, and realize crack detection over a larger area. The line connecting the midpoint of the arc in the plane of the first piezoelectric ceramic 172 and its center is parallel to the second multi-channel wire 18 and both point to the center of the second piezoelectric ceramic 202, so as to locate the center of the first piezoelectric ceramic 172, thereby facilitating the installation of the signal receiving component 17.

[0041] like Figures 1-4 As shown, to facilitate the transport of the testing equipment, an equipment compartment 21 is provided inside the housing 1. The equipment compartment 21 is equipped with a battery 22, which powers the signal acquisition unit 11, signal generator 12, signal analyzer 13, voltage amplifier 14, working computer 3, oscilloscope 4, and the first cooling fan 9 and the second cooling fan 10. Preferably, the battery 22 is a lithium polymer rechargeable battery, which has the characteristics of high energy, small size and light weight compared with the previous battery. A support plate 27 is fixed inside the equipment compartment 21 near the upper position. The support plate 27 is used to support the signal acquisition unit 11, signal generator 12, signal analyzer 13 and voltage amplifier 14. Preferably, the support plate 27 is a component made of aluminum alloy to facilitate heat conduction when the signal acquisition unit 11, signal generator 12, signal analyzer 13 and voltage amplifier 14 are working.

[0042] like Figure 1 , Figure 3 and Figure 4 As shown, to achieve cooling during the operation of the testing equipment, heat dissipation components are also provided on both sides of the equipment compartment 21 inside the housing 1. The heat dissipation components include heat dissipation cavities 23, which are opened on both sides of the equipment compartment 21. The top of each heat dissipation cavity 23 is fixed with a first partition 8. A first cooling fan 9 is installed on one of the first partitions 8, and a second cooling fan 10 is installed on the other first partition 8. Ventilation vents 26 are opened at the connection between the equipment compartment 21 and the heat dissipation cavity 23. Preferably, the first cooling fan 9 is a blower to introduce external air into the heat dissipation cavity 23, and the second cooling fan 10 is an exhaust fan to extract hot air from the heat dissipation cavity 23, thereby accelerating the airflow effect inside the housing 1 and thus dissipating heat from the signal acquisition unit 11, signal generator 12, signal analyzer 13, voltage amplifier 14, and battery 22.

[0043] In addition, to improve heat dissipation, this embodiment also includes a heat-conducting plate 24, which is located inside the equipment compartment 21. Preferably, the heat-conducting plate 24 is made of aluminum alloy, which has good heat transfer effect. The heat-conducting plate 24 is located between the support plate 27 and the battery 22. Heat sinks 25 are uniformly installed on the upper surface of the heat-conducting plate 24. The upper end of the heat sink 25 abuts against the lower surface of the support plate 27. Thermal grease is provided between the lower surface of the heat sink 25 and the battery 22. The thermal grease allows the heat energy of the battery 22 during operation to be transferred to the heat-conducting plate 24 and further to the heat sink 25. Since the air velocity near the heat sink 25 is fast, the heat sink 25 is cooled down, thereby cooling down the battery 22 during operation and extending the service life of the battery 22. In addition, heat exchange can also occur between the heat sink 25 and the support plate 27, thereby accelerating the cooling of the signal acquisition unit 11, signal generator 12, signal analyzer 13, and voltage amplifier 14 on the support plate 27.

[0044] like Figure 1 and Figure 2 As shown, in order to lock the box body 1 and the box cover 2 after they are hinged, a fixing buckle 6 is symmetrically fixed on the outside of the box body 1 away from the hinge end, and a latching buckle 5 that is symmetrically installed on the box cover 2 to match the fixing buckle 6.

[0045] In this embodiment, the cover 2 can be fixed to the box body 1 by the locking between the fixing buckle 6 and the locking buckle 5, which makes it convenient to carry the equipment and provides convenience for outdoor concrete component detection.

[0046] like Figure 1 and Figure 2 As shown, to facilitate carrying the case 1, a handle is provided on the outside of the case 1. The handle is made of PP material to improve the portability of the case 1.

[0047] like Figure 1 and Figure 3 As shown, in order to facilitate the storage of the first multi-channel wire 15, the second multi-channel wire 18, the signal receiving component 17, and the signal generating component 20, a toolbox 7 is provided inside the housing 1 near one end. The toolbox 7 is used to store the first multi-channel wire 15, the second multi-channel wire 18, the signal receiving component 17, and the signal generating component 20. In addition, the toolbox 7 can also hold a measuring tape and a camera for observing and photographing cracks on the surface of the concrete slab 29.

[0048] Example 2: like Figure 10 and Figure 11As shown, the difference between this embodiment and Embodiment 1 is that the first piezoelectric ceramic 172 has a rectangular structure. The first piezoelectric ceramic 172 with the rectangular structure forms a linear array to receive the sensing signal from the second piezoelectric ceramic 202, thereby improving the accuracy and stability of signal transmission and reducing the error during three-dimensional detection. In addition, the line connecting the center of the first piezoelectric ceramic 172 and the center of the second piezoelectric ceramic 202 is parallel to the positioning pointer 28 for positioning the center of the first piezoelectric ceramic 172, thereby facilitating the installation of the signal receiving component 17.

[0049] Example 3: like Figure 12 and Figure 13 As shown, this embodiment differs from Embodiment 1 and Embodiment 12 in that, for detecting cracks inside a large area of ​​concrete slab 29, a grid can be drawn on the surface of the concrete slab 29. By evenly arranging the signal receiving component 17 and the signal generating component 20 on the grid, and using regular polygons as the detection basis, the interior of the concrete slab 29 can be detected in different regions. This allows for detailed detection of cracks inside the concrete slab 29. In addition, by using a regional detection method, the occurrence of detection errors caused by multiple cracks between the signal receiving component 17 and the signal generating component 20 can be reduced, and the number, width, and development of cracks can be detected more accurately.

[0050] During use (operation), the signal receiving component 17 is implanted into the first implantation hole 30, and the signal generating component 20 is implanted into the second implantation hole 31. Concrete slurry is injected into the first implantation hole 30 and the second implantation hole 31. After the concrete slurry has solidified for 24 hours, the crack width development of the concrete slab 29 is detected.

[0051] One end of the first multi-channel wire 15 is electrically connected to the signal acquisition unit 11, and the other end of the first multi-channel plug 16 is plugged into the first multi-channel socket 173. One end of the second multi-channel wire 18 is electrically connected to the voltage amplifier 14, and the other end of the second multi-channel plug 19 is plugged into the second multi-channel socket 203. The working computer 3 sends a trigger signal to the signal generator 12. The voltage amplifier 14 amplifies the signal and inputs it to the signal generation component 20 through the second multi-channel wire 18. The signal generation component 20 then generates a high-frequency stress wave. The signal receiving component 17 senses the high-frequency stress wave, generates an induction signal, and transmits it to the signal acquisition unit 11 through the first multi-channel wire 15. The signal acquisition unit 11 sends the acquired induction signal to the signal analyzer 13 to achieve preliminary analysis of the induction signal. The signal is then further transmitted to the working computer 3 for storage and analysis. Finally, the induction signal is displayed through the oscilloscope 4. During this process, the induction signal can be compared with the trigger signal sent by the signal generator 12 to provide accurate data support for crack width development analysis and to achieve crack location analysis.

[0052] During the detection of crack width development in concrete slab 29, stress waves are dispersed and transmitted within space by signal generating component 20. With the setting of multiple signal receiving components 17, gravitational waves are received in multiple directions and angles, thereby increasing the detection range of concrete cracks in the plane and providing an effective basis for tracing the root cause of crack development. In addition, since the distance between each signal receiving component 17 and signal generating component 20 is the same, the signal bands received by the signal receiving component 17 have a better comparative effect, which is beneficial to concrete crack analysis.

[0053] During this process, external air is introduced into the heat dissipation cavity 23 by the first cooling fan 9, and hot air is extracted from the heat dissipation cavity 23 by the second cooling fan 10, thereby accelerating the airflow effect inside the housing 1. The thermal grease allows the heat energy of the battery 22 during operation to be transferred to the heat conduction plate 24, and further to the heat sink 25. Due to the fast airflow near the heat sink 25, the heat sink 25 is cooled down, thereby achieving the cooling of the battery 22 during operation and extending the service life of the battery 22. Heat exchange can also occur between the heat sink 25 and the support plate 27, thereby accelerating the cooling of the signal acquisition unit 11, signal generator 12, signal analyzer 13, and voltage amplifier 14 on the support plate 27.

[0054] Finally, after the crack width development detection on the concrete slab 29 is completed, the first multi-channel plug 16 is disconnected from the first multi-channel socket 173, the second multi-channel plug 19 is disconnected from the second multi-channel socket 203, and concrete grout is injected into the first implantation hole 30 and the second implantation hole 31 to completely fill the first implantation hole 30 and the second implantation hole 31, thereby reducing damage to the concrete slab 29.

[0055] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0056] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A concrete crack width development testing device, comprising testing equipment and a concrete slab (29) to be tested, characterized in that, Also includes: Signal receiving component (17), there are at least three signal receiving components (17), and a first multi-channel wire (15) is provided between the signal receiving component (17) and the signal input terminal of the test equipment. A first multi-channel plug (16) is installed at one end of the first multi-channel wire (15) connected to the signal receiving component (17). A positioning pointer (28) is provided on the outside of the first multi-channel plug (16). A signal generating component (20) is provided with a second multi-channel wire (18) between the signal generating component (20) and the signal output terminal of the test equipment. A second multi-channel plug (19) is installed at one end of the second multi-channel wire (18) connected to the signal generating component (20). The first implantation hole (30) is located in the concrete slab (29) for implanting a signal receiving component (17), and the line connecting two adjacent first implantation holes (30) in the plane is a regular polygon; The second implantation hole (31) is located within the concrete slab (29) for implanting a signal generating component (20), and the second implantation hole (31) is located at the center of the regular polygon.

2. The concrete crack width development testing device according to claim 1, characterized in that: The testing equipment includes a housing (1), a housing cover (2) hinged to one side of the housing (1), and also includes: A work computer (3) is located inside the box cover (2), and an oscilloscope (4) is electrically connected to one side of the work computer (3). A signal generator (12) is located inside a housing (1). The signal input terminal of the signal generator (12) is electrically connected to a working computer (3), and the signal output terminal of the signal generator (12) is electrically connected to a voltage amplifier (14). The output terminal of the voltage amplifier (14) is electrically connected to a second multi-channel wire (18). The signal analyzer (13) is located inside the housing (1), and the signal output terminal of the signal analyzer (13) is electrically connected to the signal input terminal of the working computer (3). The signal input terminal of the signal analyzer (13) is electrically connected to a signal acquisition device (11), and the signal acquisition device (11) is electrically connected to the first multi-channel wire (15).

3. The concrete crack width development testing device according to claim 2, characterized in that: The signal generating component (20) consists of three parts: a second encapsulation post (201), a second piezoelectric ceramic (202), and a second multi-channel socket (203). The second piezoelectric ceramic (202) is a spherical structure and there are at least two of them. The second piezoelectric ceramic (202) is encapsulated with epoxy resin to form a cylindrical second encapsulation post (201). The upper end of the second encapsulation post (201) is provided with a second multi-channel socket (203). The second multi-channel socket (203) is plugged into a second multi-channel plug (19), and the second multi-channel socket (203) is electrically connected to the second multi-channel plug (19). The second multi-channel socket (203) is individually electrically connected to each of the second piezoelectric ceramics (202) through a wire. The signal receiving component (17) consists of three parts: a first encapsulation post (171), a first piezoelectric ceramic (172), and a first multi-channel socket (173). The number of first piezoelectric ceramics (172) is the same as that of second piezoelectric ceramics (202). The first piezoelectric ceramics (172) are encapsulated with epoxy resin to form a cylindrical first encapsulation post (171). The first encapsulation post (171) is provided with a first multi-channel socket (173) at its upper end. The first multi-channel socket (173) is plugged into a first multi-channel plug (16) and is electrically connected to the first multi-channel plug (16). The first multi-channel socket (173) is electrically connected to each first piezoelectric ceramic (172) individually through a wire.

4. The concrete crack width development testing device according to claim 3, characterized in that: The first piezoelectric ceramic (172) has an arc-shaped structure and is a minor arc. The line connecting the midpoint of the arc in the plane of the first piezoelectric ceramic (172) and its center is parallel to the second multi-channel wire (18) and both point to the center of the second piezoelectric ceramic (202).

5. The concrete crack width development testing device according to claim 3, characterized in that: The first piezoelectric ceramic (172) has a rectangular structure, and the line connecting the center of the first piezoelectric ceramic (172) and the center of the second piezoelectric ceramic (202) is parallel to the positioning pointer (28).

6. The concrete crack width development testing device according to any one of claims 1-5, characterized in that: The housing (1) has an equipment compartment (21) inside, and a battery (22) is installed inside the equipment compartment (21). A support plate (27) is fixed inside the equipment compartment (21) near the upper end. The support plate (27) is used to support the signal acquisition device (11), the signal generator (12), the signal analyzer (13), and the voltage amplifier (14).

7. The concrete crack width development testing device according to claim 6, characterized in that: The housing (1) is further equipped with heat dissipation components located on both sides of the equipment compartment (21), the heat dissipation components including: Heat dissipation cavity (23) is opened on both sides of equipment compartment (21), and a first partition (8) is fixed at the top of the interior of both heat dissipation cavities (23). A first cooling fan (9) is installed on one of the first partitions (8), and a second cooling fan (10) is installed on the other first partition (8). A heat-conducting plate (24) is located inside the equipment compartment (21) and between the support plate (27) and the battery (22). Heat sinks (25) are evenly installed on the upper surface of the heat-conducting plate (24). The upper end of the heat sink (25) abuts against the lower surface of the support plate (27), and thermal grease is provided between the lower surface of the heat sink (25) and the battery (22). Ventilation opening (26) is located at the connection between equipment compartment (21) and heat dissipation cavity (23).

8. The concrete crack width development testing device according to claim 7, characterized in that: The outer side of the box (1) is symmetrically fixed with a fixing buckle (6) away from the hinge end, and the box cover (2) is symmetrically installed with a latch (5) that matches the fixing buckle (6).

9. The concrete crack width development testing device according to claim 8, characterized in that: The outer side of the box (1) is also provided with a handle, which is a component made of PP material.

10. The concrete crack width development testing device according to claim 9, characterized in that: A toolbox (7) is provided inside the box (1) near one end. The toolbox (7) is used to hold the first multi-channel wire (15), the second multi-channel wire (18), the signal receiving component (17), and the signal generating component (20).

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