Prestressed duct grouting quality detection device

Abstract

The utility model discloses a prestressed duct grouting quality detection device, which is used for detecting the grouting quality in a prestressed duct of a prestressed concrete beam and comprises an impact echo device arranged in the length direction of the prestressed duct and a stress wave device arranged on the cross section of the prestressed duct, the data acquisition and analysis system is in signal connection with the impact echo device and the stress wave device; wherein the stress wave device is used for accurately determining an uncompacted area detected by the impact echo device. According to the prestressed duct grouting quality detection device, the duct grouting quality condition can be rapidly and effectively evaluated on the premise that the structure is not damaged, carrying and operation are convenient, the detection process is rapid, the construction progress is not affected, the detection result can be obtained in real time, and the potential damage risk to the structure and the duct is eliminated through a non-destructive detection mode.

Description

Technical Field

[0001] The utility model relates to the technical field of non-destructive testing, in particular to a prestressed channel grouting quality testing device. Background Art

[0002] In post-tensioned prestressed concrete beams, the quality of the grouting of the prestressed ducts is a significant factor influencing the durability and safety of the beam. If the grouting is not dense or contains voids, it will lead to corrosion of the prestressing steel strands, resulting in a reduction in effective prestress. In severe cases, it may even cause the strands to break, seriously affecting the load-bearing capacity and service life of the prestressed concrete beam. Currently, a number of methods have been proposed for testing the grouting fullness of prestressed ducts, primarily the impact echo method. This method uses a short mechanical impact to generate low-frequency stress waves. These stress waves reflect back and forth between the component surface, the surface of internal defects, or the bottom boundary of the component surface, generating transient resonance. The resonant frequency can be identified in the amplitude spectrum, which can be used to determine the depth of internal defects and the thickness of the component. This method has the advantages of a large testing range and low requirements for the external operating environment. However, the impact echo method can only roughly determine the longitudinal extent of the grouting, and its accuracy is difficult to meet testing requirements. To this end, the utility model aims to propose a prestressed duct grouting quality detection device, which can ensure the detection accuracy of the prestressed duct grouting quality and is suitable for detection in various complex locations. Utility Model Content

[0003] In order to overcome the technical problems described in the above-mentioned prior art, the purpose of the present utility model is to provide a prestressed duct grouting quality detection device.

[0004] The utility model provides a prestressed duct grouting quality detection device for detecting the grouting quality in the prestressed duct of a prestressed concrete beam, comprising an impact echo device arranged in the length direction of the prestressed duct, a stress wave device arranged in the cross section of the prestressed duct, and a data acquisition and analysis system connected to the impact echo device and the stress wave device signal; wherein the stress wave device is used to accurately determine the loose area detected by the impact echo device.

[0005] As a preferred technical solution, the impact echo device includes an impact device arranged at one end of the prestressed duct, and an echo receiving device arranged at the other end of the prestressed duct or between the two ends; wherein, the echo receiving device is connected to the data acquisition and analysis system via a signal connection.

[0006] As a preferred technical solution, the impact device includes an excitation head for striking the prestressed channel and generating shock waves, an excitation unit for providing impact force to the excitation head, and a start button for controlling the operation of the excitation unit; wherein the excitation intensity of the excitation unit is adjustable.

[0007] As a preferred technical solution, the stress wave device includes a first piezoelectric sensor glued to the inner side of the prestressed concrete beam, and a second piezoelectric sensor glued to the outer side of the prestressed concrete beam; wherein, the first piezoelectric sensor is connected to a piezoelectric signal exciter, and the second piezoelectric sensor is connected to a piezoelectric signal receiver, and the piezoelectric signal receiver is connected to the data acquisition and analysis system through a signal connection.

[0008] As a preferred technical solution, the bonding is a connection method using a waterproof double-sided tape.

[0009] As a preferred technical solution, the second piezoelectric sensor can locally adjust the bonding position on the outer side of the prestressed concrete beam.

[0010] As a preferred technical solution, the data acquisition and analysis system includes a data storage module for storing the signal set received by the echo receiving device and the piezoelectric signal receiver, a data processing module for analyzing the signal set to determine the grouting density, and a display module for displaying the analysis results.

[0011] As a preferred technical solution, the signal connection is a wired connection using a signal transmission line, and the signal transmission line is a shielded line with an applicable temperature between -50°C and 80°C.

[0012] In summary, the present invention has the following technical effects:

[0013] The present invention provides a prestressed duct grouting quality detection device for detecting the grouting quality in the prestressed duct of a prestressed concrete beam, comprising an impact echo device disposed along the length of the prestressed duct, a stress wave device disposed along the cross section of the prestressed duct, and a data acquisition and analysis system connected to the impact echo device and the stress wave device; wherein the stress wave device is used to accurately determine the non-dense area detected by the impact echo device. The use of the above-mentioned prestressed duct grouting quality detection device has the following technical advantages: the impact echo device can roughly determine the range of non-dense grouting in the prestressed duct in the longitudinal direction, the stress wave device can determine the range of non-dense grouting in the prestressed duct in the cross section, and an advanced data acquisition and analysis system is used to provide accurate detection results. The prestressed duct grouting quality detection device can quickly and effectively evaluate the quality of the duct grouting without destroying the structure. It is easy to carry and operate, the detection process is fast, does not affect the construction progress, and can obtain detection results in real time. Moreover, the non-destructive detection method eliminates the potential risk of damage to the structure and the duct. To this end, compared with the existing prestressed duct grouting quality detection technology, the prestressed duct grouting quality detection device provided by the utility model has obvious technical advantages. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions of the present invention or 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 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.

[0015] Figure 1 is an overall schematic diagram of a shock echo device provided in some embodiments;

[0016] Figure 2 is a schematic cross-sectional view of a stress wave device provided by some embodiments;

[0017] The meanings of the reference numerals are as follows:

[0018] 1-prestressed concrete beam, 11-prestressed duct;

[0019] 21-excitation head, 22-excitation unit, 23-echo receiving device;

[0020] 3-Data acquisition and analysis system;

[0021] 41 - first piezoelectric sensor, 42 - second piezoelectric sensor, 43 - piezoelectric signal exciter. DETAILED DESCRIPTION

[0022] The following will be combined with the accompanying drawings to clearly and completely describe the technical solution in this embodiment. The embodiment described herein is for illustrative purposes only and is not intended to limit the scope of protection of the present utility model. Therefore, it should be understood that various modifications and changes can be made to this embodiment without departing from the scope of protection of the present utility model.

[0023] In the description of the present invention, unless otherwise expressly specified or limited, the term "and / or" includes any and all combinations of one or more of the associated listed items. Unless otherwise specified or explained, the terms "connected" and "fixed" should be understood broadly. For example, "connected" can mean a fixed connection, a detachable connection, an integral connection, an electrical connection, or a signal connection; "connected" can mean a direct connection or an indirect connection through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0024] Furthermore, in the description of the present invention, it should be understood that the directional words described in the present embodiment are described based on the angles shown in the accompanying drawings and should not be understood as limiting the present embodiment. It should also be understood that, in the context, when an element or feature is mentioned as being connected to another element (or elements), it can not only be directly connected to the other (or elements), but also be indirectly connected to the other (or elements) through an intermediate element.

[0025] Before introducing the technical solution of the present invention, it is necessary to explain the background of the invention of the present invention. It is common that many detection methods have been proposed at home and abroad for the detection of the fullness of prestressed duct grouting, mainly including the impact echo method, which uses a short mechanical impact to generate a low-frequency stress wave. The stress wave reflects back and forth between the surface of the component, the surface of the internal defect or the bottom boundary of the component surface, thereby generating transient resonance. The resonance frequency can be identified in the amplitude spectrum, and used to determine the depth of the internal defect and the thickness of the component. The advantage of this method is that it has a large test range and low requirements for the external operating environment. However, the impact echo method can only roughly determine the longitudinal range of the loose grouting, and the accuracy of this method is difficult to meet the test requirements. In order to overcome the technical problems of the above-mentioned prior art, the present invention aims to provide a prestressed duct grouting quality detection device.

[0026] See also Figure 1 and Figure 2An exemplary embodiment of the present invention provides a device for detecting the grouting quality of a prestressed duct 11, comprising an impact echo device arranged in the length direction of the prestressed duct 11, a stress wave device arranged in the cross section of the prestressed duct 11, and a data acquisition and analysis system 3 connected to the impact echo device and the stress wave device signals; wherein the stress wave device is used to accurately determine the loose area detected by the impact echo device.

[0027] For shock echo devices:

[0028] See also Figure 1 The impact echo device includes an impact device provided at one end of the prestressed duct 11, and an echo receiving device 23 provided at the other end or between the two ends of the prestressed duct 11; wherein the echo receiving device 23 is connected to the data acquisition and analysis system 3 via a signal connection. It should be noted that if the echo receiving device 23 is provided between the two ends of the prestressed duct 11, the echo receiving device 23 should be pre-buried in the prestressed duct 11 before grouting. Further, if Figure 1 As shown, the impact device includes an excitation head 21 for striking the prestressed duct 11 and generating shock waves, an excitation unit 22 for providing the impact force to the excitation head 21, and a start button for controlling the operation of the excitation unit 22. Thus, an echo receiving device 23 is used to receive the signals generated by the shock waves propagating and reflected in the prestressed duct 11. The echo receiving device 23 typically uses a high-sensitivity sensor to accurately capture the acoustic wave signals reflected from the duct wall and slurry. Furthermore, the excitation intensity of the excitation unit 22 is adjustable to suit the requirements of different duct materials and structures.

[0029] For stress wave devices:

[0030] See also Figure 2 , the stress wave device includes a first piezoelectric sensor 41 glued to the inner side of the prestressed concrete beam 1, and a second piezoelectric sensor 42 glued to the outer side of the prestressed concrete beam 1; wherein, the first piezoelectric sensor 41 is connected to a piezoelectric signal exciter 43, and the second piezoelectric sensor 42 is connected to a piezoelectric signal receiver, and the piezoelectric signal receiver is connected to the data acquisition and analysis system 3 through a signal connection. The above-mentioned gluing method is specifically a connection method using a waterproof double-sided tape. As a preferred technical solution, the second piezoelectric sensor 42 can locally adjust its gluing position on the outer side of the prestressed concrete beam 1 to accurately determine the area where local grouting quality problems exist.

[0031] For data acquisition and analysis system 3:

[0032] The data acquisition and analysis system 3 includes a data storage module for storing the signal sets received by the echo receiving device 23 and the piezoelectric signal receiver, a data processing module for analyzing the signal sets to determine the grouting density, and a display module for displaying the analysis results. The data processing module performs preliminary filtering to remove noise interference and integrates specialized software and algorithms for filtering, time domain, and frequency domain analysis to determine whether the duct has loose grouting or voids, and outputs detailed detection results and a visual report.

[0033] The utility model first uses an impact echo device in combination with a data acquisition and analysis system 3 to roughly determine the loose grouting area in the prestressed duct 11 in the longitudinal direction; after determining the preliminary loose area, a stress wave device is used in combination with a data acquisition and analysis system 3 to accurately determine the loose grouting range in the prestressed duct 11 in the cross section, providing accurate grouting quality detection results.

[0034] As a preferred technical solution, the signal connection is a wired connection using a signal transmission line. The signal transmission line is a shielded line with an applicable temperature between -50°C and 80°C and has sufficient strength to avoid damage during concrete pouring.

[0035] In summary, the prestressed duct grouting quality detection device provided by the present invention can not only roughly determine the range of loose grouting in the prestressed duct in the longitudinal direction, but also determine the range of loose grouting in the prestressed duct in the cross section. It uses an advanced data acquisition and analysis system to provide accurate detection results. This prestressed duct grouting quality detection device can quickly and effectively evaluate the quality of duct grouting without destroying the structure. It is convenient to carry and operate, the detection process is fast, does not affect the construction progress, can obtain detection results in real time, and the non-destructive detection method eliminates the potential risk of damage to the structure and duct. For this reason, compared with the existing prestressed duct grouting quality detection technology, the prestressed duct grouting quality detection device provided by the present invention has obvious technical advantages.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A prestressed concrete duct grouting quality detection device for detecting the grouting quality in the prestressed concrete duct of a prestressed concrete beam, characterized in that: It includes an impact echo device arranged in the length direction of the prestressed duct, a stress wave device arranged in the cross section of the prestressed duct, and a data acquisition and analysis system connected to the impact echo device and the stress wave device signal; wherein, the stress wave device is used to accurately determine the loose area detected by the impact echo device.

2. The prestressed channel grouting quality detection device according to claim 1 is characterized in that: The impact echo device includes an impact device arranged at one end of the prestressed duct, and an echo receiving device arranged at the other end of the prestressed duct or between the two ends; wherein the echo receiving device is connected to the data acquisition and analysis system through a signal connection.

3. The prestressed channel grouting quality detection device according to claim 2 is characterized in that: The impact device includes an excitation head for striking the prestressed duct and generating shock waves, an excitation unit for providing impact force to the excitation head, and a start button for controlling the operation of the excitation unit; wherein the excitation intensity of the excitation unit is adjustable.

4. The prestressed channel grouting quality detection device according to claim 3 is characterized in that: The stress wave device includes a first piezoelectric sensor glued to the inner side of the prestressed concrete beam, and a second piezoelectric sensor glued to the outer side of the prestressed concrete beam; wherein the first piezoelectric sensor is connected to a piezoelectric signal exciter, and the second piezoelectric sensor is connected to a piezoelectric signal receiver, and the piezoelectric signal receiver is connected to the data acquisition and analysis system through a signal connection.

5. The prestressed channel grouting quality detection device according to claim 4 is characterized in that: The bonding is a connection method using a waterproof double-sided tape.

6. The prestressed channel grouting quality detection device according to claim 5 is characterized in that: The second piezoelectric sensor can locally adjust the gluing position outside the prestressed concrete beam.

7. The prestressed channel grouting quality detection device according to claim 4 is characterized in that: The data acquisition and analysis system includes a data storage module for storing the signal set received by the echo receiving device and the piezoelectric signal receiver, a data processing module for analyzing the signal set to determine the grouting density, and a display module for displaying the analysis results.

8. The prestressed channel grouting quality detection device according to any one of claims 1, 2 or 4, characterized in that: The signal connection is a wired connection using a signal transmission line, and the signal transmission line is a shielded line with an applicable temperature between -50°C and 80°C.

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