Nondestructive testing method and device for thickness of steel bar protective layer and distance between steel bars of concrete pole

Abstract

The invention discloses a nondestructive testing method and device for the thickness of a concrete pole reinforcing steel bar protective layer and the distance between reinforcing steel bars. The nondestructive testing method comprises the following steps: transversely scanning a left reinforcing steel bar, a to-be-detected reinforcing steel bar and a right reinforcing steel bar of a vertical pole from left to right, namely, a left reinforcing steel bar, a to-be-detected reinforcing steel bar and a right reinforcing steel bar; the scanning method is repeated for three times, scanning is conducted 2 cm above the detected steel bar position for the first time, scanning is conducted right above the detected steel bar position for the second time, and scanning is conducted 2 cm below the detected steel bar position for the third time; and after the three times of scanning are finished, the thickness detector calculates the distance between the steel bars in the concrete pole and the thickness data of the protective layer. The calculation of radian thickness compensation is automatic calculation of a built-in system and automatic thickness compensation, and the position, several meters away from the root, of a detection point only needs to be input into a host. And meanwhile, the longitudinal bar spacing compensation is that the longitudinal bar spacing is automatically calculated by a system on the basis of detecting the surface distance of a cylinder on which the wheels of the main engine walk, and the distance is not required to be input into the main engine after manual measurement, so that time and manpower can be saved.

Description

Technical Field

[0001] The invention relates to the technical field of nondestructive testing, and in particular to a method and a device for nondestructive testing the thickness of a concrete pole steel bar protective layer and the steel bar spacing. Background Art

[0002] In the power system, reinforced concrete products such as poles and towers are widely used in infrastructure construction. The steel bars built into these products are hidden, so it is difficult to directly detect their quality defects. If there are quality problems or improper maintenance, it may cause safety accidents and economic losses. At present, the network quality inspection and operation and maintenance management of these products face many challenges.

[0003] Currently, the inspection of the protective layer thickness and steel skeleton of concrete poles relies on destructive testing methods, which means that the internal structure can only be inspected after the concrete layer on the outside of the pole is destroyed. Given that the internal skeleton structure and protective layer thickness of concrete poles are their core performance indicators, a large number of random sampling tests must be carried out to ensure that the quality of incoming materials meets the standards. However, the current destructive testing method not only makes the inspected poles unusable, thereby increasing the cost of material sampling, but also takes a long time, is inefficient, has a heavy workload, and will leave concrete waste after the inspection. These problems significantly hinder the quality monitoring of concrete poles during the warehousing stage.

[0004] The existing steel bar protective layer measuring instrument uses the principle of electromagnetic wave induction to detect the steel bar protective layer. The main bars and stirrups of the steel mesh are arranged in a horizontal and vertical grid form, and the steel bars are all produced by binding technology. The tested protective layer is basically a plane. Before the test, the main bar diameter, main bar spacing, stirrup diameter, stirrup spacing and other parameters are set. In this way, the electromagnetic wave signal is transmitted and the electromagnetic induction intensity value is received to query the database data in the system to find the thickness of the corresponding protective layer. However, the above-mentioned steel bar scanner is limited to the measurement of the building plane. The main bars inside the concrete column are not in the same plane, the stirrups are spiral bars and are produced by welding technology with the main bars. The steel bar welding process allows the steel mesh to form a closed-loop circuit. These two situations have a strong effect on the electromagnetic induction value, resulting in a large test error of the conventional steel bar protective layer measuring instrument for detecting such components, which does not meet the detection requirements.

[0005] In the power system, reinforced concrete products such as poles and towers are widely used in infrastructure construction. The steel bars built into these products are hidden, so it is difficult to directly detect their quality defects. If there are quality problems or improper maintenance, it may cause safety accidents and economic losses. At present, the network quality inspection and operation and maintenance management of these products face many challenges.

[0006] Currently, the inspection of the protective layer thickness and steel skeleton of concrete poles relies on destructive testing methods, which means that the internal structure can only be inspected after the concrete layer on the outside of the pole is destroyed. Given that the internal skeleton structure and protective layer thickness of concrete poles are their core performance indicators, a large number of random sampling tests must be carried out to ensure that the quality of incoming materials meets the standards. However, the current destructive testing method not only makes the inspected poles unusable, thereby increasing the cost of material sampling, but also takes a long time, is inefficient, has a heavy workload, and will leave concrete waste after the inspection. These problems significantly hinder the quality monitoring of concrete poles during the warehousing stage. Summary of the invention

[0007] The purpose of the invention is to provide a device for detecting the thickness of the steel bar protective layer of a concrete pole.

[0008] In order to solve the above technical problems, the technical solution adopted by the present invention is: a non-destructive detection method for the thickness of the steel bar protective layer of a concrete pole and the steel bar spacing, which is detected by a steel bar protective layer thickness detector. The detection method specifically includes the following steps:

[0009] S1. Determine the location of the steel bars

[0010] The acquisition host scans the vertical pole horizontally to detect the position of the steel bar to be detected and the positions of the steel bars on the left and right of the steel bar;

[0011] S2. Determine the spacing of spiral reinforcement

[0012] The acquisition host vertically scans the vertical poles to detect the spacing between the spiral bars in the steel bar area to be detected;

[0013] S3. Detection

[0014] a. Scan the vertical pole horizontally from left to right, including the left steel bar to be tested, the steel bar to be tested, and the steel bar to the right of the steel bar to be tested, a total of 3 steel bars;

[0015] b. Repeat scanning method a three times, the first scan is 2 cm above the detection steel bar position, the second scan is directly above the detection steel bar position, and the third scan is 2 cm below the detection steel bar position;

[0016] c. After 3 scans, the thickness detector calculates the steel bar spacing and protective layer thickness data in the concrete pole.

[0017] As a further optimization of the nondestructive detection method of the thickness of the steel bar protective layer and the steel bar spacing of a concrete pole of the present invention: the thickness detector performs arc compensation calculation when calculating the thickness of the protective layer, specifically: the steel bar protective layer thickness value t1 is detected by the steel bar protective layer thickness detector, and then the steel bar protective layer thickness value t after arc compensation is calculated by the following formula:

[0018] t=t1+t2

[0019] Among them, t1 is the thickness of the steel bar protective layer detected by the thickness detector, and t2 is the arc compensation value of the measuring point. T2 is calculated by the following formula:

[0020] t2=r-DE

[0021] Where r is the wheel radius of the equipment host, DE is the distance between the bottom surface of the equipment host and the surface of the pole, and DE is calculated by the following formula:

[0022]

[0023] Among them, R is the radius of the pole measuring point, and BC is the distance between the centers of the two wheels of the equipment host.

[0024] As a further optimization of the nondestructive testing method for the thickness of the steel bar protective layer and the steel bar spacing of a concrete pole of the present invention: the steel bar spacing is calculated as follows: the thickness detector scans the pole from left to right to points B, C, and D in turn, and the arc is calculated according to the ratio of the displacement of the detector wheel to the entire cross-section, and the straight-line distance BC between points B and C can be obtained by using trigonometric functions based on the arc; the thickness CF of the standard longitudinal reinforcement spacing of 60 is obtained by scanning three times, and the distance AF between the center of the pole and the standard longitudinal reinforcement is calculated by using the pole radius AC at point C, and the longitudinal reinforcement spacing EF can be calculated based on AC, AF, and BC; the arc is calculated based on the ratio of the displacement of the detector wheel to the entire cross-section, and the straight-line distance CD between points C and D can be obtained by using trigonometric functions based on the arc, and the longitudinal reinforcement spacing FG can be calculated based on AC, AF, and CD.

[0025] As a further optimization of the nondestructive detection method of the thickness of the steel bar protective layer and the steel bar spacing of a concrete pole of the present invention: the EF value is compared with the FG value, and the smaller value is taken for the spacing supplementary calculation, and the steel bar protective layer thickness CF at point C is compensated and calibrated by the selected value. + , according to CF + Recalculate AF + , according to AC, AF + The longitudinal reinforcement spacing EF is calculated from BC + .

[0026] As a further optimization of the nondestructive detection method of the thickness of the steel bar protective layer and the steel bar spacing of a concrete pole of the present invention: the radius of the pole measuring point is calculated by the pole root diameter D, the tip diameter d and the distance between the measuring point and the root according to the interpolation method.

[0027] As a further optimization of the nondestructive detection method of the thickness of the steel bar protective layer and the steel bar spacing of a concrete pole of the present invention: the device is a steel bar protective layer thickness detector, and the processing of the detector realizes the above-mentioned steel bar protective layer thickness and steel bar spacing detection method.

[0028] The present invention has the following beneficial effects: the calculation of the arc thickness compensation of the present invention is automatically calculated by the system in the machine and the thickness is automatically compensated. The detection point only needs to be input into the host computer at a position a few meters away from the root, so when detecting the tapered concrete pole, it is unnecessary to manually calculate the arc and then input it into the host computer for testing. At the same time, the longitudinal reinforcement spacing compensation is that the longitudinal reinforcement spacing in the calculation is automatically calculated by the system based on the distance of the cylindrical surface on which the wheels of the detection host travel, and does not need to be manually measured and then input into the host computer, which can save time and manpower. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the calculation method of the radius of the pole measuring point;

[0030] Figure 2 This is a schematic diagram of the calculation method of the arc compensation value of the pole measuring point;

[0031] Figure 3 This is a schematic diagram of the calculation method for the spacing between electric pole reinforcement bars;

[0032] Figure 4 Schematic diagram of the scanning method. DETAILED DESCRIPTION

[0033] In order to better understand the present invention, the content of the present invention is further explained below in conjunction with embodiments, but the content of the present invention is not limited to the following embodiments.

[0034] As shown in the figure: a non-destructive detection method for the thickness of the steel bar protective layer and the spacing of the steel bars of a concrete pole is used to detect the thickness of the steel bar protective layer. The detection method specifically includes the following steps:

[0035] S1. Determine the location of the steel bars

[0036] The acquisition host scans the vertical pole horizontally to detect the position of the steel bar to be detected and the positions of the steel bars on the left and right of the steel bar;

[0037] S2. Determine the spacing of spiral reinforcement

[0038] The acquisition host vertically scans the vertical poles to detect the spacing between the spiral bars in the steel bar area to be detected;

[0039] S3. Detection

[0040] a. Scan the vertical pole horizontally from left to right, including the left steel bar to be tested, the steel bar to be tested, and the steel bar to the right of the steel bar to be tested, a total of 3 steel bars;

[0041] b. Repeat scanning method a three times, the first scan is 2 cm above the detection steel bar position, the second scan is directly above the detection steel bar position, and the third scan is 2 cm below the detection steel bar position;

[0042] c. After the 3 scans, the thickness detector calculates the steel bar spacing and protective layer thickness data in the concrete pole (such as Figure 4 shown).

[0043] The thickness detector performs arc compensation calculation when calculating the thickness of the protective layer (such as Figure 2 Specifically, the steel bar protective layer thickness value t1 is detected by using a steel bar protective layer thickness detector, and then the steel bar protective layer thickness value t after arc compensation is calculated by the following formula:

[0044] t=t1+t2

[0045] Among them, t1 is the thickness of the steel bar protective layer detected by the thickness detector, and t2 is the arc compensation value of the measuring point. T2 is calculated by the following formula:

[0046] t2=r-DE

[0047] Where r is the wheel radius of the equipment host, DE is the distance between the bottom surface of the equipment host and the surface of the pole, and DE is calculated by the following formula:

[0048]

[0049] Among them, R is the radius of the pole measuring point, and BC is the distance between the centers of the two wheels of the equipment host.

[0050] The radius of the pole measuring point is calculated by the pole root diameter D, the tip diameter d and the distance from the measuring point to the root using the interpolation method (e.g. Figure 1 shown).

[0051] The calculation method of steel bar spacing is as follows ( Figure 3As shown): The thickness detector scans the pole from left to right to points B, C, and D in turn, and the arc is calculated based on the ratio of the displacement of the detector wheel to the entire cross-section. The straight-line distance BC between points B and C can be obtained based on the arc by using trigonometric functions; the thickness CF of the standard longitudinal reinforcement spacing of 60 is obtained by scanning three times, and the distance AF between the pole center and the standard longitudinal reinforcement is calculated by the pole radius AC at point C. The longitudinal reinforcement spacing EF can be calculated based on AC, AF, and BC; the arc is calculated based on the ratio of the displacement of the detector wheel to the entire cross-section, and the straight-line distance CD between points C and D can be obtained based on the arc by using trigonometric functions, and the longitudinal reinforcement spacing FG can be calculated based on AC, AF, and CD.

[0052] Compare the EF value with the FG value, take the smaller value for the spacing supplementary calculation, and use the selected value to compensate and calibrate the steel bar cover thickness CF at point C. + , according to CF + Recalculate AF + , according to AC, AF + The longitudinal reinforcement spacing EF is calculated from BC + .

[0053] Among them, the thickness detector used in the detection process is the existing technology, not the innovation of the present invention, and at least the detectors recorded in the patent documents with publication numbers CN116678304A, CN114440755A and CN114001636A can be used.

[0054] For example, according to the patent document CN114001636A, based on the eddy current effect theory, a sensor with a primary coil and a secondary coil is used, and the sensor is made to work in a magnetic coupling resonance state. The sensor working in the magnetic coupling resonance state is used to detect bare rebars at different lift-off heights, and the voltage data U1 on the secondary coil when the sensor detects bare rebars at different lift-off heights is obtained. At the same time, the sensor working in the magnetic coupling resonance state is used to detect the surface of the reinforced concrete to be tested, and the voltage data U2 on the secondary coil when the sensor detects the surface of the reinforced concrete to be tested is obtained. The voltage data U1 on the secondary coil when the sensor detects the bare rebar and the voltage data U2 on the secondary coil when the sensor detects the surface of the reinforced concrete to be tested are compared to determine the thickness of the protective layer of the reinforced concrete to be tested, thereby realizing the detection of the thickness of the protective layer of the reinforced concrete to be tested.

[0055] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art may make various modifications or variations within the scope of the claims, which do not affect the essence of the present invention.

Claims

1. A nondestructive testing method for the thickness of the steel bar protective layer of a concrete pole and the steel bar spacing, characterized in that: The steel bar protective layer thickness detector is used for detection. The detection method specifically includes the following steps: S1. Determine the location of the steel bars The acquisition host scans the vertical pole horizontally to detect the position of the steel bar to be detected and the positions of the steel bars on the left and right of the steel bar; S2. Determine the spacing of spiral reinforcement The acquisition host vertically scans the vertical poles to detect the spacing between the spiral bars in the steel bar area to be detected; S3. Detection a. Scan the vertical pole horizontally from left to right, including the left steel bar to be tested, the steel bar to be tested, and the steel bar to the right of the steel bar to be tested, a total of 3 steel bars; b. Repeat scanning method a three times, the first scan is 2 cm above the detection steel bar position, the second scan is directly above the detection steel bar position, and the third scan is 2 cm below the detection steel bar position; c. After 3 scans, the thickness detector calculates the steel bar spacing and protective layer thickness data in the concrete pole.

2. A nondestructive testing method for the thickness of the steel bar protective layer of a concrete pole and the spacing between steel bars as claimed in claim 1, characterized in that: The thickness detector performs arc compensation calculation when calculating the thickness of the protective layer. Specifically, the steel bar protective layer thickness value t1 is detected by the steel bar protective layer thickness detector, and then the steel bar protective layer thickness value t after arc compensation is calculated by the following formula: t=t1+t2 Among them, t1 is the thickness of the steel bar protective layer detected by the thickness detector, and t2 is the arc compensation value of the measuring point. T2 is calculated by the following formula: t2=r-DE Where r is the wheel radius of the equipment host, DE is the distance between the bottom surface of the equipment host and the surface of the pole, and DE is calculated by the following formula: Among them, R is the radius of the pole measuring point, and BC is the distance between the centers of the two wheels of the equipment host.

3. A nondestructive testing method for the thickness of the steel bar protective layer of a concrete pole and the steel bar spacing as claimed in claim 1, characterized in that: The calculation method of the steel bar spacing is as follows: the thickness detector scans the pole from left to right to points B, C, and D in turn, and the arc is calculated according to the ratio of the displacement of the detector wheel to the entire cross-section. The straight-line distance BC between points B and C can be obtained based on the arc by using trigonometric functions; the thickness CF of the standard longitudinal reinforcement spacing of 60 is obtained by scanning three times, and the distance AF between the center of the pole and the standard longitudinal reinforcement is calculated by using the pole radius AC at point C. The longitudinal reinforcement spacing EF can be calculated based on AC, AF, and BC; the arc is calculated based on the ratio of the displacement of the detector wheel to the entire cross-section, and the straight-line distance CD between points C and D can be obtained based on the arc by using trigonometric functions. The longitudinal reinforcement spacing FG can be calculated based on AC, AF, and CD.

4. A nondestructive testing method for the thickness of the steel bar protective layer of a concrete pole and the spacing between steel bars as claimed in claim 3, characterized in that: Compare the EF value with the FG value, take the smaller value for the spacing supplementary calculation, and use the selected value to compensate and calibrate the steel bar cover thickness CF at point C. + , according to CF + Recalculate AF + , according to AC, AF + The longitudinal reinforcement spacing EF is calculated from BC + .

5. A nondestructive testing method for the thickness of the steel bar protective layer of a concrete pole and the steel bar spacing as claimed in claim 2, characterized in that: The radius of the pole measuring point is calculated by the interpolation method based on the pole root diameter D, tip diameter d and the distance from the measuring point to the root.

6. A nondestructive testing device for the thickness of the steel bar protective layer and the steel bar spacing of a concrete pole, characterized in that: The device is a steel bar protective layer thickness detector, and the processing of the detector implements the steel bar protective layer thickness and steel bar spacing detection method described in claims 1-4.

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