Double-ring type reinforcing steel bar sleeve grouting fullness detection device

Abstract

The utility model relates to a double-ring type reinforcing steel bar sleeve grouting fullness detection device, which comprises an upper ring clamping belt, a lower ring clamping belt, two piezoelectric ceramic pieces, a data acquisition instrument and an excitation power supply, a connecting piece is arranged between the upper ring clamping belt and the lower ring clamping belt, the upper ring clamping belt and the lower ring clamping belt are respectively provided with one piezoelectric ceramic piece, and the two piezoelectric ceramic pieces are respectively connected with the data acquisition instrument and the excitation power supply. One of the two piezoelectric ceramic pieces is connected with the excitation power supply, and the other piezoelectric ceramic piece is connected with the data acquisition instrument. According to the double-ring type reinforcing steel bar sleeve grouting fullness detection device provided by the utility model, the piezoelectric ceramic piece is fixed through the clamping belt, so that the detection position of the device can be randomly adjusted, the detection position is more flexible, the complex process of pre-polishing the mounting position is omitted, and the detection result is accurate and reliable.

Description

Technical Field

[0001] The utility model relates to the technical field of building construction quality detection, in particular to a double-ring type steel bar sleeve grouting fullness detection device. Background Art

[0002] With the upgrading of my country's industrial structure and the continuous implementation of the concept of sustainable development, my country's construction industry has ushered in tremendous changes. Traditional construction methods consume a lot of resources, have a long construction period, and are prone to environmental pollution. The introduction of prefabricated buildings has injected new vitality into the construction industry and has received strong support from the country and widespread recognition from the industry.

[0003] Sleeve grouting connection is the most commonly used connection method in prefabricated buildings, which makes the node joint have the same overall performance as cast-in-place concrete beams. The basic principle of sleeve grouting is to inject high-strength, early-strength, and slightly expanding grouting material into the steel sleeve. After it hardens, the steel bars at both ends are connected into a whole, and the force in the component is transmitted through the bonding force and mechanical bite force between the materials. Therefore, if the grouting is not dense, the anchorage length of the steel bar will be insufficient, and the force performance of the steel sleeve will not meet the design requirements, causing safety hazards.

[0004] The fullness of steel sleeve grouting is difficult to observe directly. Traditional destructive sampling inspection will cause certain damage to the structure and it is difficult to cover the whole structure. The latest non-destructive testing methods for sleeve grouting mainly include pre-embedded damped vibration sensor method, wire pulling method, X-ray method, industrial CT method, etc. The principle of the pre-embedded damped sensor method is that the damped vibration sensor generates vibration under the drive of a specific excitation signal, and a certain vibrating body corresponds to the initial vibration frequency and amplitude after a certain excitation. The vibration is subject to friction and medium resistance, causing the amplitude to gradually decay over time. The fullness of the grouting is judged according to the amplitude and speed of the decay. However, the cost of the damped vibration sensor element is relatively high, and it can only be pre-embedded in advance, which will affect the construction quality of the construction personnel. The wire pulling method is to insert high-strength steel wire into the grout outlet in advance. After the grouting hardens, the fullness of the sleeve grouting is judged by the size of the pull-out force, but the test results are significantly affected by the experience of the test personnel. Although the X-ray method and industrial CT method can effectively display the fullness of the structure, the equipment is expensive and limited by the size of the structure, and there is radiation hazard. In summary, it is difficult for existing non-destructive testing technologies to balance cost and testing efficiency. Utility Model Content

[0005] The purpose of the utility model is to provide a stress wave method-based steel sleeve grouting fullness detection device and method which is easy to operate, can be directly fitted with the steel sleeve, and has accurate detection results. Without affecting the accuracy, the utility model solves the problem that the conventional piezoelectric detection requires pre-grinding and placement of the detection position, and the detection position is fixed. The technical scheme adopted is: a double-ring steel sleeve grouting fullness detection device, comprising: an upper ring cassette, a lower ring cassette, two piezoelectric ceramic sheets, a data acquisition instrument and an excitation power supply, a connecting piece is provided between the upper ring cassette and the lower ring cassette, a piezoelectric ceramic sheet is respectively provided on the upper ring cassette and the lower ring cassette, and one of the two piezoelectric ceramic sheets is connected to the excitation power supply, and the other piezoelectric ceramic sheet is connected to the data acquisition instrument.

[0006] A further improvement is that both the upper ring clip and the lower ring clip are clamp-type structures with buckles.

[0007] A further improvement is that the surface of the piezoelectric ceramic sheet in contact with the upper ring cassette and the lower ring cassette is a curved surface.

[0008] A further improvement is that the piezoelectric ceramic sheet is a tile-type structure.

[0009] A further improvement is that the piezoelectric ceramic sheet is bonded to the upper ring tape and the lower ring tape by insulating glue.

[0010] The beneficial effects of the utility model are:

[0011] The double-ring steel sleeve grouting fullness detection device provided by the utility model fixes the piezoelectric ceramic piece by a cassette, so that the detection position of the device can be adjusted at will, the detection position is more flexible, the complicated process of pre-grinding the installation position is eliminated, and the detection result is accurate and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0013] Figure 1 It is a structural schematic diagram of a double-ring steel sleeve grouting fullness detection device of the utility model;

[0014] Figure 2 It is a side view structural diagram of the double-ring steel sleeve grouting fullness detection device of the utility model when in use;

[0015] Figure 3 The utility model is a schematic structural diagram of a double-ring steel bar sleeve grouting fullness detection device. DETAILED DESCRIPTION

[0016] Now the utility model is further described in detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the utility model in a schematic manner, and therefore only show the components related to the utility model.

[0017] In the description of the utility model, it is necessary to understand that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model.

[0018] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0019] In the utility model, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the utility model can be understood according to the specific circumstances.

[0020] like Figures 1 to 3 As shown, the utility model provides a double-ring steel sleeve grouting fullness detection device, including: an upper ring cassette 1, a lower ring cassette 2, two piezoelectric ceramic sheets 3, a data acquisition instrument 4 and an excitation power supply 5, a connecting piece 6 is provided between the upper ring cassette 1 and the lower ring cassette 2, the upper ring cassette 1 and the lower ring cassette 2 can be made of metal or plastic, and the upper ring cassette 1, the connecting piece 6 and the lower ring cassette 2 form a structure similar to "]" (such as Figure 2As shown in the figure, the upper ring cassette 1 and the lower ring cassette 2 are respectively provided with a piezoelectric ceramic sheet 3, and one of the two piezoelectric ceramic sheets 3 is connected to the excitation power supply 5, and the other piezoelectric ceramic sheet 3 is connected to the data acquisition instrument 4, and the data acquisition instrument 4 is connected to the computer 8. By comparing and analyzing the collected stress wave signals and establishing the relationship between the frequency domain signal change and the sleeve grouting density, non-destructive detection of the sleeve grouting fullness is achieved.

[0021] The double-ring steel sleeve grouting fullness detection device provided by the utility model fixes the piezoelectric ceramic piece by a cassette, so that the detection position of the device can be adjusted at will, the detection position is more flexible, the complicated process of pre-grinding the installation position is eliminated, and the detection result is accurate and reliable.

[0022] Further improvement is that the upper ring clamp 1 and the lower ring clamp 2 are both clamp-type structures with buckles 7. They are used to adapt to different types of steel sleeves. At the same time, in order to further adapt to different types of sleeves, in another embodiment, the length of the connecting member 6 is adjustable, thereby realizing the adjustment of the distance between the upper and lower clamps to adapt to steel sleeves of different lengths.

[0023] A further improvement is that the surface of the piezoelectric ceramic sheet 3 in contact with the upper ring tape 1 and the lower ring tape 2 is a curved surface, so as to achieve effective fitting with the steel sleeve and improve the detection accuracy.

[0024] A further improvement is that the piezoelectric ceramic sheet 2 is a tile-type structure.

[0025] A further improvement is that the piezoelectric ceramic sheet 2 is bonded to the upper ring cassette 1 and the lower ring cassette 2 by insulating glue.

[0026] The detection method is as follows:

[0027] Step 1: Loosen the buckle on the cassette, find the position to be tested, put it on the steel sleeve, and tighten the buckle to fasten it on the sleeve.

[0028] Step 2: Paste piezoelectric ceramic sheets on the upper and lower ends of the cassette. After the cassette is tightened, weld wires on both sides of the piezoelectric ceramic sheet, one for connecting the power supply and one for connecting the data acquisition instrument. Finally, apply a layer of wax on both sides of the piezoelectric ceramic sheet and encapsulate it with epoxy resin.

[0029] Step 3: Use an excitation power supply to apply voltage to the piezoelectric ceramic sheet, and receive the stress wave signal through another piezoelectric ceramic sheet to perform multiple sets of grouting sleeve tests with different densities. Perform wavelet packet default threshold denoising on the collected signal, perform time domain analysis using the wavelet packet energy method, and finally compare the difference in wavelet packet energy values ​​to determine the fullness of the grouting. After integrating multiple sets of data, a relationship curve between the stress wave energy signal and the grouting density can be established.

[0030] Furthermore, the epoxy resin layer has a thickness of 0.1 mm.

[0031] Furthermore, the frequency of the excitation power supply transmitting signal is between 30 and 400 kHz, and the transmitting mode is intermittent transmission.

[0032] Furthermore, the signal received by the data acquisition instrument will be transmitted to the computer processing system. The computer system has a storage module that can store the data transmitted by the data acquisition instrument and compare it with the set grouting fullness benchmark value. If the comparison difference is greater than 10%, the alarm system will be activated.

[0033] Furthermore, the collected signal is denoised using a wavelet packet default threshold denoising method.

[0034] Furthermore, the noise-reduced signal is subjected to time domain analysis and frequency domain analysis, that is, the collected signal is transformed through Fourier transform to obtain a frequency domain signal graph, so as to establish the relationship between the frequency domain signal change and the grouting density.

[0035] Based on the above ideal embodiments of the utility model, the relevant staff can make various changes and modifications without deviating from the technical concept of the utility model through the above description. The technical scope of the utility model is not limited to the content of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A double-ring steel sleeve grouting fullness detection device, characterized in that: include: An upper ring cassette, a lower ring cassette, two piezoelectric ceramic sheets, a data acquisition instrument and an excitation power supply, a connecting piece is provided between the upper ring cassette and the lower ring cassette, a piezoelectric ceramic sheet is provided on each of the upper ring cassette and the lower ring cassette, and one of the two piezoelectric ceramic sheets is connected to the excitation power supply, and the other piezoelectric ceramic sheet is connected to the data acquisition instrument.

2. The double-ring steel sleeve grouting fullness detection device according to claim 1 is characterized in that: The upper ring clamping belt and the lower ring clamping belt are both clamping hoop structures with buckles.

3. The double-ring steel sleeve grouting fullness detection device according to claim 1 is characterized in that: The surface of the piezoelectric ceramic sheet in contact with the upper ring cassette and the lower ring cassette is a curved surface.

4. The double-ring steel sleeve grouting fullness detection device according to claim 3 is characterized in that: The piezoelectric ceramic sheet is a tile-type structure.

5. The double-ring steel sleeve grouting fullness detection device according to claim 3 is characterized in that: The piezoelectric ceramic sheet is bonded to the upper ring tape and the lower ring tape by means of insulating adhesive.

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