Nondestructive concrete slab thickness detection device

Abstract

The utility model relates to a nondestructive concrete slab thickness detection device. The nondestructive concrete slab thickness detection device comprises a vibration excitation source capable of vertically exciting a concrete slab, the vibration excitation source comprises a linear motor, and the output end of the linear motor is connected with a vibration excitation head; the transduction sensor arrays are arranged in a collinear mode, and the straight line where the transduction sensor arrays are located points to the excitation point of the excitation source; at least three transduction sensors are arranged in the transduction sensor array, and the distance from each transduction sensor in the transduction sensor array to the excitation point is fixed. The thickness of the concrete slab is calculated through the time difference between stress waves generated by the excitation source and the transduction sensors in the transduction sensor array and the distance between the transduction sensors and the excitation source, holing measurement is not needed, and the wave velocity during thickness calculation is offset through the array composed of the multiple transduction sensors. The problem that the wave velocity needs to be measured during measurement in the prior art is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of concrete slab quality inspection, in particular to a non-destructive concrete slab thickness detection device. Background Art

[0002] Whether the thickness of building floor slabs is qualified is an important indicator for testing the quality of construction projects and also an important indicator affecting project safety. Acceptance and inspection at all levels attach great importance to this indicator.

[0003] Existing testing methods include hole testing and non-destructive testing. Hole testing involves drilling a hole at the location to be tested, and two people working together to measure the hole depth, which is then used to determine the slab thickness. Non-destructive testing often uses electromagnetic testing, requiring two people to work together: one person places an electromagnetic transmitter above the location to be tested, while the other holds a receiver beneath the slab, until the minimum thickness is determined. Existing testing methods have drawbacks. Hole testing requires two people, which is time-consuming and can create leaks at the holes. Non-destructive testing, requiring two people, is inefficient and its accuracy is susceptible to environmental influences. The most mature non-destructive testing system is the IES scanning impact echo test system. This system uses an excitation source to impact the concrete surface, generating compression waves. A sensor placed near the impactor receives the reflected compression waves. Once the wave velocity V is known, the reception time t is analyzed from the displacement response spectrum. The concrete thickness H can be calculated using the equation H = V·t / 2. Determining the compression wave velocity V is crucial to ensuring the accuracy of this method, and is typically obtained by measuring an object of the same material with a known thickness. However, numerous factors can influence the compression wave velocity, and random factors can easily lead to measurement errors. Furthermore, there are inherent errors in the compression wave velocity measurement itself. Therefore, the existing IES scanning impact echo test system has limited test accuracy. Utility Model Content

[0004] In order to solve the above technical problem or at least partially solve the above technical problem, the utility model provides a non-destructive concrete slab thickness detection device.

[0005] The utility model provides a non-destructive concrete slab thickness detection device, comprising: an excitation source capable of vertically exciting the concrete slab, the excitation source comprising: a linear motor, the output end of the linear motor being connected to an excitation head;

[0006] The transducer array is collinearly arranged, and the straight line on which the transducer array is located points to the excitation point of the excitation source; at least three transducers are arranged in the transducer array, and the distance between each transducer in the transducer array and the excitation point is fixed.

[0007] Furthermore, the excitation source is arranged at one end of the exciter bracket, and the excitation source includes: a linear motor vertically arranged at one end of the exciter bracket, the output end of the linear motor is connected to the excitation head, the excitation head is arranged in the exciter sheath at the end of the linear motor, the exciter bracket is connected to the vertically arranged rod body through a sliding sleeve, the bottom of the rod body is vertically arranged with a transducer sensor array fixing bracket, and the transducer sensor array is collinearly arranged under the transducer sensor array fixing bracket.

[0008] Furthermore, the exciter bracket includes: two sliding sleeves sleeved on the rod body, the two sliding sleeves are connected to an inverted T-shaped support frame, the inverted T-shaped support frame is connected to a telescopic frame, and the telescopic frame is connected to the linear motor.

[0009] Furthermore, the telescopic frame includes X-shaped stretching frames that are hinged to each other, and the X-shaped stretching frames on the two sides are provided with hinge shafts and sliding columns. The hinge shafts on the two X-shaped stretching frames are respectively hinged to the fixed shaft sleeves on the linear motor and the inverted T-shaped support frame, and the sliding columns on the two X-shaped stretching frames are respectively slidably set on the limiting slide grooves on the linear motor and the inverted T-shaped support frame.

[0010] Furthermore, the bottom of the inverted T-shaped support frame is a footrest.

[0011] Furthermore, a handle is provided on the rod body, and a control switch is provided on the handle.

[0012] Furthermore, the transducer sensor includes a sleeve fixed to the transducer sensor array fixing bracket, a guide shaft is arranged in the sleeve, the sleeve and the guide shaft cooperate to slide and connect the transducer, and a spring is arranged between the transducer and the sleeve to press the transducer downward.

[0013] The above technical solution provided by the embodiment of the utility model has the following advantages compared with the prior art:

[0014] The non-destructive concrete slab thickness detection device of the present application includes an excitation source capable of vertically exciting a concrete slab, the excitation source including: a linear motor, the output end of the linear motor being connected to an excitation head; an array of collinearly arranged transducer sensors, wherein the straight line of the transducer sensor array points to the excitation point of the excitation source; at least three transducer sensors are provided in the transducer sensor array, and the distance from each transducer sensor in the transducer sensor array to the excitation point is fixed. The thickness of the concrete slab is calculated by the time difference between the stress wave generated by the excitation source and the transducer sensors in the transducer sensor array and the distance from the transducer sensor to the excitation source, without the need for drilling a hole for measurement. By using an array composed of multiple transducer sensors to offset the wave velocity when calculating the thickness, the problem of needing to measure the wave velocity during measurement in the prior art is avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present invention, and together with the description, serve to explain the principles of the present invention.

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0017] Figure 1 This is a structural schematic diagram of a non-destructive concrete slab thickness detection device provided by the utility model;

[0018] Figure 2 A schematic diagram of the structure of the transducer sensor provided by the utility model;

[0019] Figure 3 This is a schematic diagram of a non-destructive concrete slab thickness detection device provided by the utility model.

[0020] The numbers in the figure represent the following:

[0021] 1. Vibrator bracket, 11. Sliding sleeve, 12. Inverted T-shaped support bracket, 13. Telescopic bracket; 2. Vibration source, 21. Linear motor, 22. Vibrator sheath, 23. Vibration head; 3. Rod body; 4. Transducer sensor, 41. Sleeve, 42. Guide shaft, 43. Transducer, 44. Spring; 5. Transducer sensor array fixing bracket. DETAILED DESCRIPTION

[0022] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0023] It should be noted that, in this document, the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or apparatus comprising the element.

[0024] See Figure 1 As shown, the utility model aims to provide a non-destructive concrete slab thickness detection device to solve the problems in the prior art of requiring holes to destroy concrete and requiring two people to cooperate in operation, and the problem in the existing concrete slab thickness measurement system of requiring pre-calibration of the test compression wave propagation speed in concrete.

[0025] The utility model provides a non-destructive concrete slab thickness detection device, comprising: an excitation source 2 capable of vertically exciting a concrete slab; an array of transducer sensors arranged collinearly, with the straight line of the transducer sensor array pointing to the excitation point of the excitation source; at least three transducer sensors 4 are arranged in the transducer sensor array, and the distance between each transducer sensor 4 in the transducer sensor array and the excitation point is fixed.

[0026] During the specific implementation, the excitation source 2 is installed at one end of the exciter bracket 1. The excitation source 2 includes a linear motor 21 vertically installed at one end of the exciter bracket 1. The output end of the linear motor 21 is connected to an excitation head 23, and the excitation head 23 is installed in an exciter sheath 22 at the end of the linear motor 21. The excitation source 2 is used to vertically bombard the concrete slab during the test to generate pressure waves in the concrete slab.

[0027] The exciter bracket 1 is connected to a vertically arranged rod body 3 through a sliding sleeve. A transducer sensor array fixing bracket 5 is vertically arranged at the bottom of the rod body 3. The transducer sensor array is collinearly arranged below the transducer sensor array fixing bracket 5.

[0028] During the specific implementation process, the exciter bracket 1 includes: two sliding sleeves 11 that are sleeved on the rod body 3, and the two sliding sleeves 11 are connected to the inverted T-shaped support frame 12, and the bottom of the inverted T-shaped support frame 12 is a foot pedal. The exciter bracket 1 is connected to the rod body through the sliding sleeve 11, and the vertical vibration generated by the linear motor will not be transmitted to the rod body 3 to affect the measurement. The inverted T-shaped support frame 12 is connected to the telescopic frame 13, and the telescopic frame 13 is connected to the linear motor 21. Specifically, the telescopic frame 13 includes mutually hinged X-shaped extension frames, and the two side X-shaped extension frames are provided with hinge shafts and sliding columns. The hinge shafts on the two X-shaped extension frames are respectively hinged to the fixed shaft sleeves on the linear motor 21 and the inverted T-shaped support frame 12, and the sliding columns on the two X-shaped extension frames are respectively slidably provided on the limiting slide grooves on the linear motor 21 and the inverted T-shaped support frame 12. The use of the telescopic frame allows the entire non-destructive concrete slab thickness detection device to be foldable for easy storage.

[0029] The rod body 3 is provided with a handle 31, and the handle 31 is provided with a control switch 32. The control switch 32 controls the linear motor 21 to start and vibrate.

[0030] The transducer 4 includes a sleeve 41 fixed to the transducer array fixing bracket 5. A guide shaft 42 is disposed within the sleeve 41. The sleeve 41 and the guide shaft 42 cooperate to slide and connect a transducer 43. A spring 44 is disposed between the transducer 43 and the sleeve 41 to press the transducer downward. The spring 44 ensures that the transducer 43 is in close contact with the concrete slab, ensuring accurate measurement.

[0031] The transducer sensors 4 are connected to a host computer via a data line, and the host computer calculates the thickness of the concrete slab based on the data of the stress wave received by each transducer sensor for the first time.

[0032] The use and working principle of this utility model are as follows:

[0033] Clean the concrete slab to be tested: clean up the debris on the concrete slab to be tested, sweep away the surface dust, and make the concrete slab to be tested clean.

[0034] Place the inverted T-shaped support frame 12 on the concrete slab to be tested. Step on the inverted T-shaped support frame 12 to ensure that the exciter sleeve 23 is in close contact with the concrete slab surface. Adjust the rod body 3 to ensure that the transducer sensor array is in close contact with the concrete slab surface. To operate the excitation: Turn on the excitation control button and wait for the linear motor to drive the exciter head to bombard the concrete slab surface to generate stress waves.

[0035] After the stress wave is generated, it will propagate within the concrete. Due to the different acoustic impedances at the concrete boundary surface, i.e., the bottom surface of the concrete slab, the stress wave will be reflected at the interface. The reflected stress wave will then be reflected back into the concrete from the concrete surface, thus forming multiple reflections. The transducer sensors on the transducer sensor array will also collect the surface pressure wave response at that point, obtaining a spectrum of the pressure wave. The obvious peak in the spectrum is the corresponding velocity response and time when the first stress wave is first reflected from the concrete boundary surface back to the sensor. The earliest pressure wave response signal received by each sensor is caused by the stress wave being reflected on the interface via the shortest path. The shortest path is similar to the reflection path of light, i.e., the angle of incidence = angle of reflection. The signal processing system can be used to determine the time from the action of the exciter to the first reception of the stress wave by each transducer sensor.

[0036] The calculation principle is as follows Figure 3 As shown in the figure, the time from the exciter to the first time each sensor receives the stress wave is t1, t2, and t3 respectively; the propagation speed of the stress wave in concrete is V, the distance from the excitation source to each transducer is S1, S1+S2, and S1+S2+S3 respectively; the thickness of the concrete slab is D, then:

[0037] (Vt1 / 2) 2 -(S1 / 2) 2 =D 2 ;

[0038]

[0039] The two sets of thicknesses D1 and D2 of the concrete slab can be solved using the above relationship.

[0040]

[0041] Based on the two sets of calculated thicknesses D1 and D2 of the concrete slab, the average thickness is calculated as the final measured thickness D of the concrete slab:

[0042]

[0043] The non-destructive concrete slab thickness detection device of the present application includes an excitation source capable of vertically exciting a concrete slab, the excitation source including: a linear motor, the output end of the linear motor being connected to an excitation head; an array of collinearly arranged transducer sensors, wherein the straight line of the transducer sensor array points to the excitation point of the excitation source; at least three transducer sensors are provided in the transducer sensor array, and the distance from each transducer sensor in the transducer sensor array to the excitation point is fixed. The thickness of the concrete slab is calculated by the time difference between the stress wave generated by the excitation source and the transducer sensors in the transducer sensor array and the distance from the transducer sensor to the excitation source, without the need for drilling a hole for measurement. By using an array composed of multiple transducer sensors to offset the wave velocity when calculating the thickness, the problem of needing to measure the wave velocity during measurement in the prior art is avoided.

[0044] In the embodiments provided by the present invention, it should be understood that the disclosed structures can be implemented in other ways. For example, the structural embodiments described above are merely illustrative. For example, the division of the units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interface, structure or unit, which can be electrical, mechanical or other forms.

[0045] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0046] In addition, the functional units in the various embodiments of the present invention may be integrated into a single processing unit, or each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.

[0047] The foregoing description is intended only to provide specific embodiments of the present invention, intended to enable those skilled in the art to understand and implement the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not intended to be limited to the embodiments shown herein, but rather to be construed in the broadest manner consistent with the principles and novel features claimed herein.

Claims

1. A non-destructive concrete slab thickness detection device, characterized in that: include: An excitation source (2) capable of vertically exciting a concrete slab, the excitation source (2) comprising: a linear motor (21), the output end of the linear motor (21) being connected to an excitation head (23); A transducer array is collinearly arranged, and the straight line on which the transducer array is located points to the excitation point of an excitation source; at least three transducers (4) are arranged in the transducer array, and the distance between each transducer (4) in the transducer array and the excitation point is fixed.

2. The non-destructive concrete slab thickness detection device according to claim 1, characterized in that: The excitation source (2) is arranged at one end of the exciter bracket (1), and the excitation source (2) includes: a linear motor (21) vertically arranged at one end of the exciter bracket (1), the output end of the linear motor (21) is connected to an excitation head (23), and the excitation head (23) is arranged in an exciter sheath (22) at the end of the linear motor (21); the exciter bracket (1) is connected to a vertically arranged rod body (3) through a sliding sleeve, and a transducer array fixing bracket (5) is vertically arranged at the bottom of the rod body (3), and a transducer array is collinearly arranged under the transducer array fixing bracket (5).

3. The non-destructive concrete slab thickness detection device according to claim 2, characterized in that: The exciter bracket (1) comprises: two sliding sleeves (11) sleeved on the rod body (3); the two sliding sleeves (11) are connected to an inverted T-shaped support frame (12); the inverted T-shaped support frame (12) is connected to a telescopic frame (13); and the telescopic frame (13) is connected to the linear motor (21).

4. The non-destructive concrete slab thickness detection device according to claim 3, characterized in that: The telescopic frame (13) includes X-shaped stretching frames hinged to each other, and hinge shafts and sliding columns are provided on the two most side X-shaped stretching frames. The hinge shafts on the two X-shaped stretching frames are hinged to the fixed shaft sleeves on the linear motor (21) and the inverted T-shaped support frame (12) respectively, and the sliding columns on the two X-shaped stretching frames are slidably provided on the limiting slide grooves on the linear motor (21) and the inverted T-shaped support frame (12) respectively.

5. The non-destructive concrete slab thickness detection device according to claim 3, characterized in that: The bottom of the inverted T-shaped support frame (12) is a foot pedal.

6. The non-destructive concrete slab thickness detection device according to claim 2, characterized in that: The rod body (3) is provided with a handle (31), and the handle (31) is provided with a control switch (32).

7. The non-destructive concrete slab thickness detection device according to claim 1, characterized in that: The transducer sensor (4) comprises a sleeve (41) fixed to a transducer sensor array fixing bracket (5), a guide shaft (42) is arranged in the sleeve (41), the sleeve (41) and the guide shaft (42) cooperate to slide and connect a transducer (43), and a spring (44) for pressing the transducer downward is arranged between the transducer (43) and the sleeve (41).

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