Nondestructive detection device and detection method for corrosion of steel bars in concrete

Abstract

The invention relates to the technical field of steel bar detection equipment, in particular to a nondestructive detection device and method for corrosion of steel bars in concrete, and the nondestructive detection device comprises a microwave detector body, a detector butt joint, a butt joint cylinder, a connector, a locking cylinder, a detection wire, a conductive branch wire, a first-stage locking mechanism, a limiting mechanism and a second-stage locking mechanism, the non-contact, non-damage and high-precision detection of the substance can be realized by detecting the substance by utilizing the electromagnetic wave characteristic of the microwave, compared with the traditional detection method, the microwave detection has the advantages of higher sensitivity, short operation time, convenience, low cost, harmlessness to a human body and the like, and in the specific detection, the penetrability of microwave flaw detection is strong, and the detection accuracy is high. According to the method, the defect of several meters of depth can be detected, a detection scheme for damage of the reinforcing steel bars in the protective layer is provided from the perspective of a new detection technology, the corrosion condition of the reinforcing steel bars of the concrete structure under the protective layer can be nondestructively detected, and the reinforced concrete structure can be better managed and maintained.

Description

Technical Field

[0001] The present application relates to the technical field of steel bar detection equipment, and in particular to a non-destructive detection device and method for steel bar corrosion in concrete. Background Art

[0002] In the process of safety inspection of concrete structure houses, the inspection of steel bars in concrete is an important quality control link in the field of inspection and identification. By inspecting the steel bars in the concrete structure, the quality and correctness of the steel bars can be judged to ensure the safety and stability of the concrete structure.

[0003] Concrete and reinforced concrete have become the most widely used building materials in the world due to their wide availability of raw materials, high compressive strength, good volume stability, easy construction and on-site shaping, and low cost. However, when reinforced concrete structures are exposed to harsh environments for a long time, the influence of external corrosive media often makes the service life of these structures not as long as expected, thus failing to meet the durability requirements specified in the specifications. Practice has shown that a large number of reinforced concrete structures have to be reinforced and repaired because of durability problems that affect normal use. The global economic losses caused by the durability failure of concrete structures amount to hundreds of billions of dollars.

[0004] Among the durability issues of reinforced concrete structures, durability damage detection of existing structures is a very important issue, and the detection of steel corrosion in concrete is of utmost importance. Timely discovery and accurate diagnosis of steel corrosion in concrete can accurately grasp the actual degree of structural durability damage, which is an important prerequisite for durability assessment, remaining service life prediction and maintenance plan selection of reinforced concrete structures. Without reliable steel corrosion data, reliable evaluation and prediction results cannot be obtained. Therefore, the development of reliable, accurate and easy-to-engineer application on-site non-destructive detection technology for steel corrosion in reinforced concrete has become a research focus of scholars at home and abroad.

[0005] Steel bar corrosion is a relatively common durability problem that seriously threatens the safety of structures. It occupies a dominant position among the factors affecting the durability of structures. Steel bar corrosion is the most important and direct factor causing durability damage to reinforced concrete structures, and it is also one of the main forms of durability damage to concrete houses. The damage caused by steel bar corrosion to house structures can be divided into three periods: the early stage is local corrosion on the surface of the steel bar, and rust spots and rust flakes appear; the middle stage is the corrosion of the entire surface of the steel bar, and expansion occurs, separating from the protective layer and causing layer cracking; the late stage is manifested as further expansion of the steel bar rust, damage to the concrete itself, cracking along the steel bar, and concrete detachment, until the steel bar continues to rust, the effective cross-section continues to decrease, the structural bearing capacity continues to decline, and the reinforced concrete components lose their basic bearing capacity.

[0006] Traditional detection methods mainly include visual inspection, percussion inspection, etc. Generally, local damage is used for on-site inspection, that is, the protective layer of the inspection site is chiseled off and the actual diameter of the steel bar after rusting is measured. If necessary, part of the steel bar can be cut off and taken back to the laboratory for inspection. The disadvantage of this method is that it is time-consuming and labor-intensive, and will cause a certain degree of damage to the building or structural components. Summary of the invention

[0007] In order to solve the problem that the traditional detection method for steel bars is time-consuming, labor-intensive, and may cause a certain degree of damage to buildings or structural components, the present application provides a non-destructive detection device and detection method for steel bar corrosion in concrete.

[0008] In the first aspect, the present application provides a non-destructive detection device for steel bar corrosion in concrete using the following technical solution: A nondestructive detection device for steel bar corrosion in concrete, comprising: A microwave detector body, wherein a detector docking joint is arranged at the bottom of the microwave detector body, and a docking tube is arranged on the detector docking joint, a connector is docked at the bottom of the detector docking joint, a locking tube is connected to an end of the connector close to the detector docking joint, and a detection wire is connected to an end of the connector away from the detector docking joint, a probe is arranged on an end of the detection wire away from the detector docking joint, a conductive branch line is arranged inside the detection wire, a through hole is penetrated through the connector, the conductive branch line passes through the through hole of the connector, and is connected in the docking tube; A primary locking mechanism, which is used to lock the conductive branch line, the interior of the connector is provided with an installation cavity, the primary locking mechanism is arranged in the installation cavity of the connector, and the primary locking mechanism comprises a transmission rod, a ratchet, a linkage rod and a locking sleeve, the transmission rod is rotatably connected to the axis of the connector, the ratchet is coaxially fixed to one end of the transmission rod, and the ratchet is located in the installation cavity of the connector, one end of the linkage rod is rotatably connected to the side wall of the transmission rod, the other end of the linkage rod is connected to the side wall of the locking sleeve, and the conductive branch line passes through the locking sleeve; A limiting mechanism, which is used to limit and lock the ratchet, and the limiting mechanism is arranged in the mounting cavity of the connector and is located on one side of the ratchet; A secondary locking mechanism is used to lock the detection wire, and the secondary locking mechanism is arranged on an end of the connector away from the locking cylinder.

[0009] By adopting the above technical solution, the electromagnetic wave characteristics of microwaves can be used to detect materials to achieve non-contact, non-destructive, and high-precision detection of materials. Compared with traditional detection methods, the advantages of microwave detection are relatively high sensitivity, short and convenient operation time, low cost, and harmlessness to the human body. In specific detection, microwave flaw detection has strong penetration ability and can detect defects at a depth of several meters. From the perspective of new detection technology, a detection scheme for steel bar damage in the protective layer is proposed, which can non-destructively detect the corrosion of steel bars in concrete structures under the protective layer, and implement better management and maintenance of reinforced concrete structures. At the same time, the combination of the primary locking mechanism and the limit mechanism enables the conductive branch line to be firmly locked in the connector, preventing the conductive branch line from slipping in the connector due to pulling force during daily use, which in turn causes the conductive branch line to separate from the docking end of the docking tube, and thus causes detection failure. This effectively ensures the stability and reliability of the microwave detector body when detecting steel bars in concrete structures.

[0010] Optionally, a toggle plate is provided on one end of the transmission rod located on the connecting head and close to the locking cylinder.

[0011] By adopting the above technical solution, the transmission rod can be quickly toggled and rotated in the connecting head by utilizing the toggle plate.

[0012] Optionally, the through holes on the connector are arranged in one-to-one correspondence with the conductive branch lines and the locking sleeve.

[0013] By adopting the above technical solution, the conductive branch line can be quickly connected and assembled with the connector and the locking sleeve.

[0014] Optionally, the limiting mechanism includes a pawl, a rotating rod is provided at the center of the pawl, and the pawl is rotatably connected to the mounting cavity of the connecting head through the rotating rod, and one end of the pawl slides and abuts against the edge of the ratchet wheel.

[0015] By adopting the above technical solution, the ratchet is limited by the pawl to prevent the locking sleeve from resetting due to the reverse rotation of the ratchet.

[0016] Optionally, an elastic reset member is clamped on one end of the pawl away from the ratchet, and one end of the elastic reset member is fixed to the inner wall of the mounting cavity of the connector.

[0017] By adopting the above technical solution, the elastic force of the elastic reset member is utilized to pull the pawl, so that one end of the pawl can be firmly abutted against the edge of the ratchet wheel.

[0018] Optionally, the limiting mechanism also includes an abutment rod, a side wall of the connecting head is penetrated by a slot, and one end of the slot is communicated with the mounting cavity of the connecting head, the abutment rod is slidably engaged in the slot, and one end of the abutment rod is slidably abutted against the side wall of the pawl away from the ratchet wheel.

[0019] By adopting the above technical solution, the staff can use the abutment rod to push the pawl through the abutment rod when it is necessary to separate the conductive branch line from the connector, thereby separating the pawl from the ratchet wheel, and then resetting and unlocking the locking sleeve, so that the conductive branch line and the connector can be quickly separated.

[0020] Optionally, at least two groups of the limiting mechanisms are symmetrically arranged on the edge of the ratchet.

[0021] By adopting the above technical solution, the ratchet can be evenly limited and locked by utilizing the symmetrically arranged limiting mechanisms, thereby avoiding uneven force.

[0022] Optionally, the secondary locking mechanism includes a locking claw and an extrusion cylinder, the locking claw is fixed at the bottom edge of the connector, and a plurality of locking claws are equidistantly fixed, and the plurality of locking claws are combined together to form a cylindrical structure, the extrusion cylinder is sleeved on the outside of the detection wire, and threads are provided on the outer wall of the locking claw and the inner wall of the extrusion cylinder, the extrusion cylinder is screwed to the outside of the locking claw by threads, and the extrusion cylinder has a truncated cone structure.

[0023] By adopting the above technical solution, the locking claw is squeezed and contracted by the extrusion cylinder, and then the detection wire is locked by the locking claw, so as to prevent the detection wire from sliding in the connector under force.

[0024] Optionally, the locking cylinder is rotatably connected to the connecting head, and threads are provided on the inner wall of the locking cylinder and the outer wall of the detector docking joint, and the locking cylinder is screwed and connected to the connecting head via the threads.

[0025] By adopting the above technical solution, the detector docking head and the connector can be connected and locked to each other by using the locking cylinder, thereby preventing the two from being separated.

[0026] In a second aspect, the present application also provides a nondestructive testing method, using the nondestructive testing device for steel bar corrosion in concrete of the present application, comprising the following steps: S1. Wire connection: pass the conductive branch wire of the detection wire through the through hole on the connector, and then rotate the transmission rod in the primary locking mechanism to drive the ratchet to rotate, so that the linkage rod is linked and pushes the locking sleeve to move, so that the locking sleeve is misaligned with the through hole in the connector, and then the conductive branch wire is locked, and then the extrusion cylinder is rotated to dock with the locking claw, and the detection wire is locked by the locking claw; S2. Docking and locking: dock the connector with the detector docking connector, and during docking, dock the conductive branch line with the docking tube, and at the same time, screw and lock the locking tube on the detector docking head; S3. Steel bar detection: attach the probe at one end of the detection wire to the position that needs to be detected, and transmit microwave signals to the object to be detected through the microwave detector body. The object to be detected absorbs part of the microwave signal and reflects part of the microwave signal. The reflected microwave signal is received by the microwave detector body, and by calculating and processing parameters such as the time and intensity of the reflected signal, relevant information of the detected concrete component can be obtained, and the specific corrosion position of the internal steel bars can also be obtained.

[0027] By adopting the above technical scheme, the electromagnetic wave characteristics of microwaves are used to detect materials, so that non-contact, non-destructive and high-precision detection of materials can be achieved. At the same time, a locking effect of the conductive branch line is achieved by setting a primary locking mechanism and a limit mechanism, so as to avoid the conductive branch line from being separated from the docking tube and causing the failure of the microwave detector body to be detected. At the same time, the detection wire is locked by setting a secondary locking mechanism to avoid the detection wire being pulled and then pulling the conductive branch line, thereby further ensuring the stability of the microwave detector body when detecting concrete steel bars.

[0028] In summary, the present application includes at least one of the following beneficial technical effects: 1. Using the electromagnetic wave characteristics of microwaves to detect materials can achieve non-contact, non-destructive, and high-precision detection of materials. Compared with traditional detection methods, the advantages of microwave detection are high sensitivity, short and convenient operation time, low cost, and harmlessness to the human body. In specific detection, microwave flaw detection has strong penetration ability and can detect defects at a depth of several meters. From the perspective of new detection technology, a detection scheme for steel bar damage in the protective layer is proposed, which can non-destructively detect the corrosion of steel bars in concrete structures under the protective layer, and implement better management and maintenance of reinforced concrete structures; 2. The combination of the primary locking mechanism and the limit mechanism enables the conductive branch line to be firmly locked in the connector, preventing the conductive branch line from slipping in the connector due to pulling force during daily use, thereby causing the conductive branch line to separate from the butt end of the butt tube, and thus causing detection failure, effectively ensuring the stability and reliability of the microwave detector body when detecting steel bars in concrete structures; 3. Use the secondary locking mechanism to lock the detection wire to prevent the detection wire from being pulled and then pulling the conductive branch line, further ensuring the stability of the microwave detector body when detecting concrete steel bars. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1It is a schematic diagram of the external structure of a nondestructive detection device for steel bar corrosion in concrete in this embodiment.

[0030] Figure 2 It is a schematic diagram of the separation structure of the detector butt joint and the connector in this embodiment.

[0031] Figure 3 Schematic diagram of the overall structure of the connector in this embodiment.

[0032] Figure 4 Schematic diagram of the conductive branch line connection structure in this embodiment.

[0033] Figure 5 Schematic diagram of the ratchet connection structure in this embodiment.

[0034] Figure 6 It is a schematic diagram of the overall connection structure of the primary locking mechanism and the limiting mechanism in this embodiment.

[0035] Description of reference numerals: 1. Microwave detector body; 2. Detector docking joint; 3. Docking tube; 4. Connector; 5. Locking tube; 6. Detection wire; 7. Conductive branch line; 8. Primary locking mechanism; 81. Transmission rod; 82. Ratchet; 83. Linkage rod; 84. Locking sleeve; 85. Toggle plate; 9. Limiting mechanism; 91. Ratchet; 92. Elastic reset member; 93. Abutment rod; 10. Secondary locking mechanism; 101. Locking claw; 102. Extrusion tube. DETAILED DESCRIPTION

[0036] The following is combined with Figure 1-6 This application is described in further detail.

[0037] The embodiments of the present application disclose a nondestructive detection device and a detection method for steel bar corrosion in concrete.

[0038] It should be noted that, in the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention 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 should not be understood as a limitation on the present invention.

[0039] In a first aspect, the present application provides a nondestructive detection device for steel bar corrosion in concrete.

[0040] Reference Figure 1 and Figure 2A nondestructive detection device for steel bar corrosion in concrete includes a microwave detector body 1, a detector joint 2, a joint tube 3, a connector 4, a locking tube 5, a detection wire 6, a conductive branch line 7, a primary locking mechanism 8, a limit mechanism 9 and a secondary locking mechanism 10. The electromagnetic wave characteristics of microwaves are used to detect materials, which can achieve non-contact, non-destructive and high-precision detection of materials. Compared with traditional detection methods, the advantages of microwave detection are relatively high sensitivity, short and convenient operation time, low cost, harmlessness to the human body, etc. In specific detection, microwave flaw detection has strong penetration ability and can detect defects at a depth of several meters. From the new detection technology From a technical perspective, a detection scheme for steel bar damage in a protective layer is proposed, which can non-destructively detect the corrosion of the steel bars in the concrete structure under the protective layer, and implement better management and maintenance of the reinforced concrete structure; at the same time, the combination of the primary locking mechanism 8 and the limiting mechanism 9 is used to enable the conductive branch line 7 to be firmly locked in the connector 4, thereby preventing the conductive branch line 7 from slipping in the connector 4 due to the pulling force during daily use, thereby causing the conductive branch line 7 to separate from the docking end of the docking tube 3, and thereby causing detection failure, thereby effectively ensuring the stability and reliability of the microwave detector body 1 when detecting steel bars in concrete structures.

[0041] Specifically, a detector docking joint 2 is provided at the bottom of the microwave detector body 1, and a docking tube 3 is provided on the detector docking joint 2, a connector 4 is docked at the bottom of the detector docking joint 2, a locking tube 5 is connected to the end of the connector 4 close to the detector docking joint 2, and a detection wire 6 is connected to the end of the connector 4 away from the detector docking joint 2, a probe is provided on the end of the detection wire 6 away from the detector docking joint 2, a conductive branch line 7 is provided inside the detection wire 6, a through hole is penetrated on the connector 4, the conductive branch line 7 passes through the through hole of the connector 4 and is connected in the docking tube 3, an installation cavity is provided inside the connector 4, and a primary locking mechanism 8 for locking the conductive branch line 7 is provided in the installation cavity of the connector 4.

[0042] Reference Figure 3 and Figure 4 In the embodiment of the present application, regarding the primary locking mechanism 8, the primary locking mechanism 8 includes a transmission rod 81, a ratchet 82, a linkage rod 83, a locking sleeve 84 and a toggle plate 85. The toggle plate 85 enables the transmission rod 81 to be quickly toggled and rotated in the connector 4, so that the ratchet 82 can rotate synchronously and drive the linkage rod 83 to link, thereby pushing the locking sleeve 84 to move, so that the conductive branch line 7 can be firmly locked in the connector 4, avoiding the conductive branch line 7 from slipping in the connector 4 due to the pulling force during daily use, thereby causing the conductive branch line 7 to separate from the docking end of the docking tube 3, and then causing the detection failure to occur, effectively ensuring the stability and reliability of the microwave detector body 1 when detecting steel bars in concrete structures.

[0043] Specifically, the transmission rod 81 is rotatably connected to the axis of the connector 4, the ratchet 82 is coaxially fixed to one end of the transmission rod 81, and the ratchet 82 is located in the installation cavity of the connector 4, one end of the linkage rod 83 is rotatably connected to the side wall of the transmission rod 81, the other end of the linkage rod 83 is connected to the side wall of the locking sleeve 84, and the conductive branch line 7 passes through the locking sleeve 84, and a toggle plate 85 is provided on one end of the transmission rod 81 located on the connector 4 close to the locking cylinder 5.

[0044] Reference Figure 5 and Figure 6 In the embodiment of the present application, regarding the limiting mechanism 9, the limiting mechanism 9 includes a pawl 91, an elastic reset member 92 and an abutment rod 93. A rotating rod is provided at the center of the pawl 91, and the pawl 91 is rotatably connected to the mounting cavity of the connector 4 through the rotating rod, and one end of the pawl 91 slides and abuts against the edge of the ratchet 82, and an elastic reset member 92 is clamped at one end of the pawl 91 away from the ratchet 82, and one end of the elastic reset member 92 is fixed to the inner wall of the mounting cavity of the connector 4, a notch is penetrated on the side wall of the connector 4, and one end of the notch is connected to the mounting cavity of the connector 4, the abutment rod 93 is slidably clamped in the notch, and one end of the abutment rod 93 slides and abuts against the side wall of the pawl 91 away from the ratchet 82.

[0045] In the embodiment of the present application, the pawl 91 is used to limit the ratchet 82 to prevent the ratchet 82 from reversing and causing the locking sleeve 84 to reset. At the same time, the pawl 91 is pulled by the elastic force of the elastic reset member 92, so that one end of the pawl 91 can firmly abut against the edge of the ratchet 82, and when the staff needs to separate the conductive branch line 7 from the connector 4, the abutment rod 93 can push the pawl 91, thereby separating the pawl 91 from the ratchet 82, and then the locking sleeve 84 can be reset and unlocked, so that the conductive branch line 7 and the connector 4 can be quickly separated.

[0046] In the embodiment of the present application, a secondary locking mechanism 10 for locking the detection wire 6 is arranged on the end of the connector 4 away from the locking cylinder 5. The secondary locking mechanism 10 includes a locking claw 101 and an extrusion cylinder 102. The extrusion cylinder 102 is used to squeeze the locking claw 101 to contract, and then the locking claw 101 is used to lock the detection wire 6 to prevent the detection wire 6 from sliding in the connector 4 under force.

[0047] The locking claw 101 is fixed at the bottom edge of the connector 4, and a number of locking claws 101 are fixed at equal distances, and a number of locking claws 101 are combined together to form a cylindrical structure. The extrusion cylinder 102 is sleeved on the outside of the detection wire 6, and threads are provided on the outer wall of the locking claw 101 and the inner wall of the extrusion cylinder 102. The extrusion cylinder 102 is screwed and connected to the outside of the locking claw 101 by threads, and the extrusion cylinder 102 has a truncated cone structure.

[0048] In the embodiment of the present application, regarding the locking cylinder 5, the locking cylinder 5 is rotatably connected to the connecting head 4, and threads are provided on the inner wall of the locking cylinder 5 and the outer wall of the detector docking head 2. The locking cylinder 5 is screwed on the connecting head 4 by threads. The locking cylinder 5 is utilized to enable the detector docking head 2 and the connecting head 4 to be connected and locked to each other to prevent the two from being separated.

[0049] Specifically, the through holes on the connector 4 are arranged in one-to-one correspondence with the conductive branch line 7 and the locking sleeve 84, so that the conductive branch line 7 can be quickly docked and assembled with the connector 4 and the locking sleeve 84, and at the same time, at least two groups of limiting mechanisms 9 are symmetrically arranged at the edge of the ratchet 82, so that the ratchet 82 can be evenly limited and locked to avoid uneven force.

[0050] The implementation principle of the nondestructive detection device for steel bar corrosion in concrete of the present application embodiment is as follows: firstly, the conductive branch line 7 is inserted into the through hole of the connector 4, and then the transmission rod 81 and the ratchet 82 are driven to rotate by the toggle plate 85, and then the locking sleeve 84 is driven to move by the linkage rod 83, and the conductive branch line 7 is locked by the misalignment of the locking sleeve 84 and the through hole, and then the extrusion cylinder 102 is docked with the locking claw 101, and the detection wire 6 is locked by the locking claw 101, and then the conductive branch line 7 is docked with the docking cylinder 3, and the locking cylinder 5 is screwed on the docking cylinder 3; In the process of microwave nondestructive testing, the transmitter transmits microwave signals to the object to be tested. The object to be tested absorbs part of the microwave signals and reflects part of the microwave signals. The receiver receives the reflected microwave signals. By calculating and processing the parameters such as the time and intensity of the reflected signals, the relevant information of the tested concrete components can be obtained, and the specific corrosion position of the internal steel bars can also be obtained. After microwave testing, the original protective layer hollowing, rust expansion cracking or concrete peeling can be selected on site. The cross-sectional rust loss rate of the steel bars can be calculated according to the effective cross-sectional area of ​​the corroded steel bars and the nominal cross-sectional area before rust, or the weight loss rate of the steel bars can be calculated according to the net weight of the corroded steel bars and the nominal mass before rust, or the rust layer on the surface of the steel bars can be scraped off on site, and the effective diameter of the steel bars after rust in two orthogonal directions can be measured with a vernier caliper, and then the effective cross-sectional area of ​​the corroded steel bars can be approximately calculated according to the ellipse. This can not only greatly reduce the amount of damage on site and minimize the damage to the original structure of the house concrete caused by the test, but also supplement and verify the microwave nondestructive testing technology.

[0051] Second, refer to Figure 1-Figure 6 , the present application also provides a nondestructive testing method, comprising the following steps: S1. Wire connection. The conductive branch wire 7 of the detection wire 6 is passed through the through hole on the connector 4. Then, the transmission rod 81 in the primary locking mechanism 8 is rotated to drive the ratchet 82 to rotate, so that the linkage rod 83 is linked and pushes the locking sleeve 84 to move, so that the locking sleeve 84 is misaligned with the through hole in the connector 4, and the conductive branch wire 7 is locked. Then, the extrusion cylinder 102 is rotated to dock with the locking claw 101, and the detection wire 6 is locked by the locking claw 101. S2, docking and locking, docking the connector 4 with the detector docking connector 2, and during docking, docking the conductive branch line 7 with the docking tube 3, and at the same time, screwing and locking the locking tube 5 on the detector docking connector 2; S3, steel bar detection, attach the probe at one end of the detection wire 6 to the position to be detected, and transmit microwave signals to the object to be detected through the microwave detector body 1. The object to be detected absorbs part of the microwave signal and reflects part of the microwave signal. The reflected microwave signal is received by the microwave detector body 1, and the parameters such as the time and intensity of the reflected signal are calculated and processed to obtain relevant information of the detected concrete component and the specific corrosion position of the internal steel bars.

[0052] Detecting materials using the electromagnetic wave characteristics of microwaves can achieve non-contact, non-destructive, and high-precision detection of materials. At the same time, a locking effect on the conductive branch line 7 is achieved by setting a primary locking mechanism 8 and a limiting mechanism 9 to prevent the conductive branch line 7 from separating from the docking tube 3 and causing the microwave detector body 1 to fail in detection. At the same time, a secondary locking mechanism 10 is set to lock the detection wire 6 to prevent the detection wire 6 from being pulled and then pulling the conductive branch line 7, further ensuring the stability of the microwave detector body 1 when detecting concrete steel bars.

[0053] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A nondestructive testing device for steel bar corrosion in concrete, characterized in that: include: A microwave detector body (1), wherein a detector docking joint (2) is provided at the bottom of the microwave detector body (1), and a docking tube (3) is provided on the detector docking joint (2), and a connector (4) is docked at the bottom of the detector docking joint (2), and an end of the connector (4) close to the detector docking joint (2) is connected to a locking tube (5), and an end of the connector (4) away from the detector docking joint (2) is connected to a detection wire (6), and an end of the detection wire (6) away from the detector docking joint (2) is provided with a probe, and a conductive branch line (7) is provided inside the detection wire (6), and a through hole is provided on the connector (4), and the conductive branch line (7) passes through the through hole of the connector (4) and is connected to the docking tube (3); a primary locking mechanism (8) for locking the conductive branch line (7); a mounting cavity is provided inside the connector (4); the primary locking mechanism (8) is arranged in the mounting cavity of the connector (4); and the primary locking mechanism (8) comprises a transmission rod (81), a ratchet (82), a linkage rod (83) and a locking sleeve (84); the transmission rod (81) is rotatably connected to the axis of the connector (4); the ratchet (82) is coaxially fixed to one end of the transmission rod (81); the ratchet (82) is located in the mounting cavity of the connector (4); one end of the linkage rod (83) is rotatably connected to a side wall of the transmission rod (81); the other end of the linkage rod (83) is connected to a side wall of the locking sleeve (84); and the conductive branch line (7) passes through the locking sleeve (84); a limiting mechanism (9) for limiting and locking the ratchet (82), wherein the limiting mechanism (9) is arranged in the mounting cavity of the connector (4) and is located on one side of the ratchet (82); A secondary locking mechanism (10) is used to lock the detection wire (6), and the secondary locking mechanism (10) is arranged on an end of the connector (4) away from the locking cylinder (5).

2. A nondestructive testing device for steel bar corrosion in concrete according to claim 1, characterized in that: A toggle plate (85) is provided on one end of the transmission rod (81) located on the connecting head (4) and close to the locking cylinder (5).

3. The nondestructive testing device for steel bar corrosion in concrete according to claim 1, characterized in that: The through holes on the connector (4) are arranged in one-to-one correspondence with the conductive branch wires (7) and the locking sleeves (84).

4. The nondestructive testing device for steel bar corrosion in concrete according to claim 1, characterized in that: The limiting mechanism (9) comprises a pawl (91), a rotating rod is provided at the center of the pawl (91), and the pawl (91) is rotatably connected to the installation cavity of the connecting head (4) via the rotating rod, and one end of the pawl (91) is slidably abutted against the edge of the ratchet wheel (82).

5. A nondestructive testing device for steel bar corrosion in concrete according to claim 4, characterized in that: An elastic reset member (92) is clamped on one end of the pawl (91) away from the ratchet (82), and one end of the elastic reset member (92) is fixed to the inner wall of the mounting cavity of the connector (4).

6. A nondestructive testing device for steel bar corrosion in concrete according to claim 4, characterized in that: The limiting mechanism (9) further comprises an abutment rod (93), a side wall of the connecting head (4) being provided with a slot, one end of the slot being communicated with the mounting cavity of the connecting head (4), the abutment rod (93) being slidably engaged in the slot, and one end of the abutment rod (93) being slidably engaged with a side wall of the pawl (91) away from the ratchet (82).

7. The nondestructive testing device for steel bar corrosion in concrete according to claim 1, characterized in that: At least two groups of the limiting mechanisms (9) are symmetrically arranged at the edge of the ratchet (82).

8. The nondestructive testing device for steel bar corrosion in concrete according to claim 1, characterized in that: The secondary locking mechanism (10) comprises a locking claw (101) and an extrusion cylinder (102); the locking claw (101) is fixed at the bottom edge of the connector (4); a plurality of the locking claws (101) are fixed at equal intervals, and the plurality of the locking claws (101) are combined together to form a cylindrical structure; the extrusion cylinder (102) is sleeved on the outside of the detection wire (6); threads are provided on the outer wall of the locking claw (101) and the inner wall of the extrusion cylinder (102); the extrusion cylinder (102) is screwed to the outside of the locking claw (101) by means of threads, and the extrusion cylinder (102) is in the form of a truncated cone.

9. The nondestructive testing device for steel bar corrosion in concrete according to claim 1, characterized in that: The locking cylinder (5) is rotatably connected to the connecting head (4), and threads are provided on the inner wall of the locking cylinder (5) and the outer wall of the detector docking head (2), and the locking cylinder (5) is screwed onto the connecting head (4) via the threads.

10. A non-destructive testing method, characterized in that: The following steps are involved: S1, connecting the wires, passing the conductive branch wire (7) of the detection wire (6) through the through hole on the connector (4), then rotating the transmission rod (81) in the primary locking mechanism (8) to drive the ratchet (82) to rotate, thereby causing the linkage rod (83) to move and push the locking sleeve (84), so that the locking sleeve (84) is misaligned with the through hole in the connector (4), thereby locking the conductive branch wire (7), then rotating the extrusion cylinder (102) to dock with the locking claw (101), and locking the detection wire (6) through the locking claw (101); S2, docking and locking, docking the connector (4) with the detector docking connector (2), and during docking, docking the conductive branch line (7) with the docking tube (3), and at the same time, screwing and locking the locking tube (5) on the detector docking connector (2); S3, steel bar detection, attaching the probe at one end of the detection wire (6) to the position to be detected, transmitting a microwave signal to the object to be detected through the microwave detector body (1), the object to be detected absorbs a part of the microwave signal and reflects a part of the microwave signal, receiving the reflected microwave signal through the microwave detector body (1), and calculating and processing parameters such as the time and intensity of the reflected signal, thereby obtaining relevant information of the detected concrete component and the specific corrosion position of the internal steel bar.

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