Device, system and method for detecting density of grouting material in steel sleeve connector

Abstract

The present invention relates to the technical field of building quality inspection, and specifically discloses a device, system and method for detecting the density of grouting material in a steel sleeve connector. The detection device includes an outer shell with an elongated inner cavity, a start button and a high-frequency transmitting socket and a high-frequency receiving socket installed on the outer shell, and also includes an ultrasonic transmitting component and an ultrasonic receiving component installed side by side in the elongated inner cavity. The present invention can realize the sending and receiving of ultrasonic signals in the same direction with only one handheld button operation. Compared with the existing detection method, the step of placing detection components before detection is omitted, thereby improving the detection efficiency. When in use, the detection device only needs to detect from the surface of the concrete, which has the advantages of convenient operation and no damage to components. The detection device uses ultrasonic waves as the detection medium, and detects the grouting quality inside the steel sleeve by comparing the characteristic difference of the reflected signals of fully filled and incompletely filled steel sleeves. The detection result is accurate and reliable.

Description

Technical Field

[0001] The present invention relates to the technical field of building quality detection, and in particular to a device, system and method for detecting the density of grouting material in a steel sleeve connector. Background Art

[0002] The application of prefabricated buildings in my country's construction sector is expanding. Before assembly, the components are manufactured in a prefabrication plant and then transported to the construction site. Reliable connection methods and installation machinery are used to assemble the components, creating a building that meets the designed functional requirements. Compared to cast-in-place construction, prefabricated buildings offer many advantages, including ease of construction, faster project completion, minimal impact on the surrounding environment, and easily guaranteed quality of building components.

[0003] Grouting sleeve connections are currently one of the primary methods for connecting rebar in prefabricated concrete structures. Using specialized sleeves and high-strength, non-shrinkage grouting material, they offer advantages such as quick construction, simple load-bearing, low additional stress, wide applicability, and ease of absorbing construction errors. Because this connection is located at a critical stress-bearing point within the component, connection quality is crucial. If the grouting inside the sleeve is not fully saturated, the rebar connection will not meet the expected performance, posing a serious structural safety hazard. Therefore, testing the density of the grouting material within the rebar sleeve connection is crucial and essential. In recent years, methods for testing the density of the grouting material within rebar sleeve connections have included embedded sensors, embedded wire pullout, impact echo, X-ray testing, and ultrasonic testing. Each method has its limitations, but ultrasonic testing offers non-destructive testing and is more widely used. Ultrasonic testing utilizes the strong penetrating power of ultrasound to assess the grouting quality within the rebar sleeve by comparing the reflected wave signal strength of fully and partially filled rebar sleeves. However, the current ultrasonic testing methods all use transducer products that can emit and receive ultrasound. There are no corresponding products designed entirely for the testing environment and specific needs of the density of the grouting material in the steel sleeve connector. Therefore, the testing process is cumbersome and requires the cooperation of multiple people. The test results obtained have large errors, and the overall testing effect is not ideal.

[0004] Therefore, people in this field are in urgent need of finding a new technical solution to solve the above problems. Summary of the Invention

[0005] In response to the technical problems in the prior art, the present invention provides a device, system and method for detecting the density of grouting material in a steel sleeve connector.

[0006] The present invention includes a device for detecting the density of grouting material in a steel sleeve connector, comprising an outer shell with a long inner cavity, a start button and a high-frequency transmitting socket and a high-frequency receiving socket installed on the outer shell, and an ultrasonic transmitting component and an ultrasonic receiving component installed side by side in the long inner cavity, wherein:

[0007] The ultrasonic transmitting assembly includes a first front end gasket, a first metal sheet, a first piezoelectric chip, and a first backing member that are tightly fitted together in sequence, and also includes a first transmission line connecting the first piezoelectric chip and the high-frequency transmitting socket; the first front end gasket, the first metal sheet, the first piezoelectric chip, and the first backing member are combined to form a conical transmitting head, and a first through hole is defined in the outer shell, and the top end of the first front end gasket passes through the first through hole and is located outside the outer shell;

[0008] The ultrasonic receiving assembly includes a second front end gasket, a second metal sheet, a second piezoelectric wafer, and a second backing member that are tightly fitted together in sequence, and also includes a second transmission line connecting the second piezoelectric wafer and the high-frequency receiving socket; the second front end gasket, the second metal sheet, the second piezoelectric wafer, and the second backing member are combined to form a conical receiving head, and a second through hole is defined in the outer shell, and the top end of the second front end gasket passes through the second through hole and is located outside the outer shell;

[0009] The start button is connected to the first transmission line and the second transmission line, and the start button controls the first transmission line and the second transmission line to be synchronously connected and disconnected.

[0010] Furthermore, the first front end gasket and the second front end gasket are made of non-metallic wear-resistant material.

[0011] Furthermore, the size range of the ultrasonic transmitting component and the ultrasonic receiving component is 1.5 mm to 3 mm.

[0012] Furthermore, the distance between the top end of the first front end gasket and the top end of the second front end gasket is 15 mm to 30 mm.

[0013] Furthermore, the conical transmitting head and the conical receiving head are conical.

[0014] Furthermore, the angle between the ultrasonic transmitting component and the ultrasonic receiving component is 0° to 15°.

[0015] Furthermore, the detection device transmits and receives signals in a frequency range of 150kHz to 300kHz.

[0016] The present invention also includes a system for detecting the density of grouting material in a steel sleeve connector, comprising the above-mentioned detection device and a signal analysis host, the signal analysis host being electrically connected to a high-frequency transmitting socket and a high-frequency receiving socket on the detection device;

[0017] The signal analysis host is used to send a detection signal under preset parameters to the detection device; the detection device receives the detection signal, and after starting the button action, it transmits the ultrasonic signal outward through the ultrasonic transmitting component, and receives the measured ultrasonic signal through the ultrasonic receiving component, and converts it into a measured detection signal and sends it to the signal analysis host; the signal analysis host displays the waveform of the detection signal before and after the measurement.

[0018] The present invention also includes a method for detecting the density of grouting material in a steel sleeve connector. The detection method is implemented based on the above-mentioned detection system and includes the following steps:

[0019] S1: Rough marking of steel sleeve position: Estimate the position of steel sleeve around the side of the column according to the construction drawings and draw preliminary marking points;

[0020] S2: Determination and marking of the specific position of the steel sleeve: Place the detection device at each preliminary marking point in turn for testing. Correct the position of the preliminary marking point based on the waveform displayed on the signal analysis host to obtain the accurate marking point; the position of the accurate marking point is the position on the side of the column closest to the steel sleeve;

[0021] S3: Collection point marking: Based on the position of the accurate marking point and the axial direction of the steel sleeve, mark several collection points corresponding to each steel sleeve on the side of the column; among the several collection points corresponding to each steel sleeve, the distance between two adjacent collection points is no more than 5 cm;

[0022] S4: Density detection: Place the detection device at each collection point in turn for testing, and analyze and judge the density of the grouting material in the corresponding steel sleeve based on the waveform displayed on the signal analysis host.

[0023] Furthermore, in step S4, when the detection device tests each collection point position, the number of samples is 1000 to 5000.

[0024] The present invention provides a device, system and method for detecting the density of grouting material in a steel sleeve connector. The detection device includes an ultrasonic transmitting component and an ultrasonic receiving component installed side by side, and the ultrasonic transmitting component and the ultrasonic receiving component both include a conical transmitting head and a conical receiving head composed of a tightly fitting front end gasket, a metal sheet, a piezoelectric chip and a backing sheet, to achieve precise detection in a small range. The detection device can realize the sending and receiving of ultrasonic signals in the same direction with only one hand-held one-button operation. Compared with the existing detection method, the step of placing detection components before detection is omitted, thereby improving the detection efficiency. In addition, the detection device of the present invention only needs to detect from the surface of the concrete when in use, which has the advantages of convenient operation and non-destructiveness to components. The detection device uses ultrasonic waves as the detection medium, and detects the grouting quality inside the steel sleeve by comparing the characteristic differences of the reflected signals of fully filled and incompletely filled steel sleeves. The detection results are accurate and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] 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, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0026] Figure 1 Schematic diagram of the structure of a device for detecting the density of grouting material in a steel sleeve connector according to an embodiment of the present invention;

[0027] Figure 2 A flowchart of a method for detecting the density of grouting material in a steel sleeve connector according to an embodiment of the present invention;

[0028] Figure 3 Schematic diagram of the positions of marking points in a method for detecting the density of grouting material in a steel sleeve connector according to an embodiment of the present invention;

[0029] Among them: 10-outer shell, 20-start button, 30-high-frequency transmitting socket, 40-high-frequency receiving socket, 50-ultrasonic transmitting component, 501-first front end gasket, 502-first metal sheet, 503-first piezoelectric chip, 504-first backing member, 505-first transmission line, 60-ultrasonic receiving component, 601-second front end gasket, 602-second metal sheet, 603-second piezoelectric chip, 604-second backing member, 605-second transmission line, 70-rebar sleeve. DETAILED DESCRIPTION

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only 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 any creative efforts are within the scope of protection of the present invention.

[0031] A device for detecting the density of grouting material in a steel sleeve connector according to an embodiment of the present invention is as follows: Figure 1 As shown, the detection device includes an outer housing 10 with an elongated inner cavity, a start button 20, a high-frequency transmitting socket 30, and a high-frequency receiving socket 40 mounted on the outer housing 10. Furthermore, the device includes an ultrasonic transmitter assembly 50 and an ultrasonic receiver assembly 60 mounted side by side within the elongated inner cavity. A soundproofing panel is installed between the ultrasonic transmitter assembly 50 and the ultrasonic receiver assembly 60 to reduce interference. In this embodiment, the outer housing 10 can be made of metal. The side-by-side installation of the ultrasonic transmitter assembly 50 and the ultrasonic receiver assembly 60 enables transmission and reception in the same direction, improving detection efficiency.

[0032] The ultrasonic transmitting assembly 50 includes a first front end gasket 501, a first metal sheet 502, a first piezoelectric chip 503 and a first backing member 504 that are tightly fitted in sequence, and also includes a first transmission line 505 connecting the first piezoelectric chip 503 and the high-frequency transmitting socket 30; the first front end gasket 501, the first metal sheet 502, the first piezoelectric chip 503 and the first backing member 504 are combined to form a conical transmitting head, and a first through hole is opened on the outer shell 10, and the top end of the first front end gasket 501 passes through the first through hole and is located between the outer shell 10. The ultrasonic receiving assembly 60 includes a second front-end gasket 601, a second metal sheet 602, a second piezoelectric chip 603, and a second backing member 604, which fit tightly together. It also includes a second transmission line 605 connecting the second piezoelectric chip 603 and the high-frequency receiving socket 40. The second front-end gasket 601, the second metal sheet 602, the second piezoelectric chip 603, and the second backing member 604 form a conical receiving head. A second through-hole is defined in the outer shell 10, and the top end of the second front-end gasket 601 passes through the second through-hole and is located outside the outer shell 10. A start button 20 is connected to the first transmission line 505 and the second transmission line 605. The start button 20 controls the synchronous connection and disconnection of the first and second transmission lines 505 and 605. Pressing the start button 20 once triggers the transmission and reception of signals.

[0033] The first and second through-holes can also be referred to as inspection ports. The first and second front-end gaskets 501 and 601, exposed from the inspection ports, contact the concrete surface during inspection. The first and second transmission lines 505 and 605 both utilize high-frequency conductors to transmit signals. The first and second front-end gaskets 501 and 601 are made of a non-metallic, wear-resistant material, such as hard rubber, to prevent wear of the first and second metal sheets 502 and 602. The conical transmitter and receiver heads are preferably conical in design.

[0034] The detection device of the embodiment of the present invention integrates ultrasonic transmission and reception into one device, which can be directly held by hand to perform detection and is easy to operate.

[0035] Specifically, since the gap between the steel bar and the sleeve is small after the steel bar sleeve is connected, in order to collect more precise detection signals, the size range of the ultrasonic transmitting component 50 and the ultrasonic receiving component 60 in the embodiment of the present invention is selected to be 1.5mm to 3mm. Preferably, the ultrasonic transmitting component 50 and the ultrasonic receiving component 60 are a tiny probe mechanism of 2mm in size. The ultrasonic transmitting component 50 and the ultrasonic receiving component 60 are fixed to transmit and receive higher frequency directional ultrasonic signals. In the embodiment of the present invention, the frequency range of the signal transmitted and received by the detection device is 150kHz to 300kHz, and the frequency is adjustable. In the embodiment of the present invention, the top of the first front end gasket 501 and the top of the second front end gasket 601 are set to be 15mm to 30mm apart. Preferably, the spacing is set to 20mm.

[0036] Specifically, in the embodiment of the present invention, the angle between the ultrasonic transmitting component 50 and the ultrasonic receiving component 60 is 0° to 15°. When the detection device is measuring, the ultrasonic transmitting component 50 and the ultrasonic receiving component 60 form a small inclination angle with the concrete surface, which can detect ultrasonic signals within a certain area. Figure 3 As shown, the ultrasonic transmitting assembly 50 and ultrasonic receiving assembly 60 of detection device C are slightly angled, creating an angle between the ultrasonic signal's transmission and reception directions. This detection device utilizes a single-transmitter, single-receiver approach, with a wide detection range of up to 40 mm and a depth detection range of at least 150 mm within the concrete component surface. This range encompasses rebar sleeves of various sizes and types, ensuring detection of the entire rebar sleeve connection area.

[0037] The device for detecting the density of grouting material in a steel sleeve connector of an embodiment of the present invention comprises an ultrasonic transmitting assembly and an ultrasonic receiving assembly installed side by side, and both the ultrasonic transmitting assembly and the ultrasonic receiving assembly comprise a conical transmitting head and a conical receiving head composed of a tightly fitting front end gasket, a metal sheet, a piezoelectric chip and a backing sheet, to achieve precise detection in a small range. The detection device can realize the sending and receiving of ultrasonic signals in the same direction with only one-button handheld operation. Compared with the existing detection method, the step of placing detection components before detection is omitted, thereby improving the detection efficiency. In addition, the detection device of the present invention only needs to detect from the surface of the concrete when in use, which has the advantages of convenient operation and non-destructiveness to components. The detection device uses ultrasonic waves as the detection medium, and detects the grouting quality inside the steel sleeve by comparing the characteristic differences of the reflected signals of fully filled and incompletely filled steel sleeves. The detection results are accurate and reliable.

[0038] The present invention also includes a system for detecting the density of grouting material in a steel sleeve connector, comprising the detection device of the above embodiment, and a signal analysis host electrically connected to a high-frequency transmitting socket and a high-frequency receiving socket on the detection device; the signal analysis host is used to send a detection signal under preset parameters to the detection device; the detection device receives the detection signal, transmits an ultrasonic signal outwardly through an ultrasonic transmitting component after a key action is activated, and receives the measured ultrasonic signal through an ultrasonic receiving component, converts the measured ultrasonic signal into a measured detection signal, and then sends it to the signal analysis host; the signal analysis host displays the waveform of the detection signal before and after the measurement. The ultrasonic signal emitted outwardly by the ultrasonic transmitting component has a significant difference in waveform characteristics between the signal reflected at the steel sleeve position and the signal reflected at the pure concrete position. Therefore, the waveform characteristics of the signal reflected by the steel sleeve with dense grouting and the signal reflected by the loose grouting also have significant differences. By comparing the waveform characteristics (such as the first wave velocity, amplitude, frequency, etc.), the location of the loose grouting can be accurately found.

[0039] In this embodiment of the present invention, transmission and reception can be triggered by a start button on the hand detection device or by a button on the signal analysis host. The specific method is determined by the operator. The signal analysis host in this embodiment of the present invention should have an adaptive filtering function to enable the collection and analysis of weak signals in the field.

[0040] The present invention also includes an embodiment of a method for detecting the density of grouting material in a steel sleeve connector, such as Figure 2 As shown, the detection method is implemented based on the detection system of the above embodiment, including the steps of:

[0041] Step S1: Roughly mark the position of the steel sleeve: Estimate the position of the steel sleeve around the side of the column according to the construction drawings and draw preliminary marking points.

[0042] First, roughly locate the position of the steel sleeve on the surface of the column. This step is achieved with the help of the construction drawings of the column. After estimating the approximate position of the steel sleeve, draw preliminary marking points at the corresponding positions. Due to the different sizes and force requirements of the columns, the number and specific specifications of the steel sleeves used in each column are also different. Therefore, the embodiment of the present invention does not specifically limit the number and size of the steel sleeves. Figure 3 The figure shows a cross-section of a column, with the steel sleeves located near the column edge and varying in diameter. Typically, the distance between the steel sleeve boundary closest to the column's outer surface and the distance from the outer surface farther away is approximately 30 mm, so the detection device of the aforementioned embodiment of the present invention can meet basic usage requirements.

[0043] Step S2: Determination and marking of the specific position of the steel sleeve: Place the detection device at the position of each preliminary marking point in turn for testing, and correct the position of the preliminary marking point according to the waveform displayed on the signal analysis host to obtain the accurate marking point; the position of the accurate marking point is the position on the side of the column closest to the steel sleeve.

[0044] The specific location of the steel sleeve can be determined based on the difference in waveform characteristics, and the accurate marking point can be drawn on the side of the column. Figure 3 As shown, the positions of the detection devices A, B, and C are the specific positions of the steel sleeves at the corresponding positions for detecting.

[0045] Step S3: Marking of collection points: According to the position of the accurate marking point and the axial direction of the steel sleeve, mark several collection points corresponding to each steel sleeve on the side of the column; among the several collection points corresponding to each steel sleeve, the distance between two adjacent collection points is no more than 5 cm, and mark the collection points with a pen.

[0046] Step S4: density detection: Place the detection device at each collection point in turn for testing, and analyze and judge the density of the grouting material in the corresponding steel sleeve based on the waveform displayed on the signal analysis host.

[0047] According to the location of the marked collection point, the detection device is placed at the marked collection point. Pressing the start button triggers the ultrasonic signal transmission and synchronous triggering of reception. When the detection device tests each collection point, the number of samples is 1000-5000. Preferably, the number of samples per transmission and reception is guaranteed to be no less than 1024. The ultrasonic signal after detection is filtered and processed, and the waveform is displayed on the display screen of the signal analysis host. After confirming that the detection signal is correct, the next location is detected.

[0048] The signal analysis host in the embodiment of the present invention is preferably a touch-screen operated product, supports Chinese and English input, and displays a waveform diagram (or image diagram, wave train diagram, wave velocity, amplitude curve, table, etc., and the above display content can be selected, combined, switched, etc.) in real time during sampling. During sampling, the amplification factor, delay time, judgment threshold and sampling step can be adjusted simultaneously, and it also has an adaptive filtering function to realize the collection and analysis of weak signals on site.

[0049] The embodiments of the present invention provide a device, system and method for detecting the density of grouting material in a steel sleeve connector. The detection device includes an ultrasonic transmitting component and an ultrasonic receiving component installed side by side, and the ultrasonic transmitting component and the ultrasonic receiving component both include a conical transmitting head and a conical receiving head composed of a tightly fitting front end gasket, a metal sheet, a piezoelectric chip and a backing sheet, to achieve precise detection in a small range. The detection device can transmit and receive ultrasonic signals in the same direction with only one hand-held button operation. Compared with the existing detection method, the step of placing detection components before detection is omitted, thereby improving detection efficiency. In addition, the detection device of the present invention only needs to detect from the surface of the concrete when in use, which has the advantages of convenient operation and non-destructiveness to components. The detection device uses ultrasonic waves as the detection medium to detect the grouting quality inside the steel sleeve by comparing the characteristic differences of the reflected signals of fully filled and incompletely filled steel sleeves. The detection results are accurate and reliable.

[0050] The present invention is further described above with the aid of specific embodiments. However, it should be understood that the specific description herein should not be construed as limiting the essence and scope of the present invention. Various modifications made to the above embodiments by ordinary technicians in this field after reading this specification are all within the scope of protection of the present invention.

Claims

1. A device for detecting the density of grouting material in a steel sleeve connector, characterized in that: It includes an outer shell with a long inner cavity, a start button and a high-frequency transmitting socket and a high-frequency receiving socket installed on the outer shell, and also includes an ultrasonic transmitting component and an ultrasonic receiving component installed side by side in the long inner cavity, wherein: The ultrasonic transmitting assembly includes a first front end gasket, a first metal sheet, a first piezoelectric chip, and a first backing member that are tightly fitted together in sequence, and also includes a first transmission line connecting the first piezoelectric chip and the high-frequency transmitting socket; the first front end gasket, the first metal sheet, the first piezoelectric chip, and the first backing member are combined to form a conical transmitting head, and a first through hole is defined in the outer shell, and the top end of the first front end gasket passes through the first through hole and is located outside the outer shell; The ultrasonic receiving assembly includes a second front end gasket, a second metal sheet, a second piezoelectric chip, and a second backing member that are tightly fitted together in sequence, and also includes a second transmission line connecting the second piezoelectric chip and the high-frequency receiving socket; the second front end gasket, the second metal sheet, the second piezoelectric chip, and the second backing member are combined to form a conical receiving head, and a second through hole is defined in the outer shell, and the top end of the second front end gasket passes through the second through hole and is located outside the outer shell; The start button is connected to the first transmission line and the second transmission line, and the start button controls the first transmission line and the second transmission line to be synchronously connected and disconnected; The size range of the ultrasonic transmitting component and the ultrasonic receiving component is 1.5mm to 3mm; The included angle between the ultrasonic transmitting component and the ultrasonic receiving component is 0~15.

2. A device for detecting the density of grouting material in a steel sleeve connector according to claim 1, characterized in that: The first front end gasket and the second front end gasket are made of non-metallic wear-resistant material.

3. A device for detecting the density of grouting material in a steel sleeve connector according to claim 1, characterized in that: The distance between the top end of the first front end gasket and the top end of the second front end gasket is 15 mm to 30 mm.

4. A device for detecting the density of grouting material in a steel sleeve connector according to claim 1, characterized in that: The conical emitting head and the conical receiving head are conical.

5. A device for detecting the density of grouting material in a steel sleeve connector according to claim 1, characterized in that: The detection device transmits and receives signals in a frequency range of 150kHz to 300kHz.

6. A system for detecting the density of grouting material in a steel sleeve connector, characterized in that: The detection device according to any one of claims 1 to 5, further comprising a signal analysis host, wherein the signal analysis host is electrically connected to the high-frequency transmitting socket and the high-frequency receiving socket on the detection device; The signal analysis host is used to send a detection signal under preset parameters to the detection device; the detection device receives the detection signal, and after the start button is pressed, it transmits an ultrasonic signal outward through the ultrasonic transmitting component, and receives the measured ultrasonic signal through the ultrasonic receiving component, and converts it into a measured detection signal and sends it to the signal analysis host; the signal analysis host displays the waveform of the detection signal before and after measurement.

7. A method for detecting the density of grouting material in a steel sleeve connector, characterized in that: The detection method is implemented based on the detection system according to claim 6, comprising the steps of: S1: Rough marking of steel sleeve position: Estimate the position of steel sleeve around the side of the column according to the construction drawings and draw preliminary marking points; S2: Determining and marking the specific position of the steel sleeve: The detection device is placed at the position of each of the preliminary marking points in turn for testing, and the position of the preliminary marking point is corrected according to the waveform displayed on the signal analysis host to obtain the accurate marking point; the position of the accurate marking point is the position on the side of the column closest to the steel sleeve; S3: Collection point marking: Based on the position of the accurate marking point and the axial direction of the steel sleeve, mark several collection points corresponding to each steel sleeve on the side of the column; among the several collection points corresponding to each steel sleeve, the distance between two adjacent collection points is no more than 5 cm; S4: Density detection: The detection device is placed at each of the collection points in turn for testing, and the density of the grouting material in the corresponding steel sleeve is analyzed and judged according to the waveform displayed on the signal analysis host. When the detection device tests each collection point, the number of samples is 1000 to 5000.

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