Method for detecting diameter of internal reinforcing steel of electric pole based on x-ray imaging technology

Abstract

The application discloses a kind of based on X-ray imaging technology's electric pole internal reinforcing bar diameter detection method, electric pole is hollow cylinder, first adopt soft ruler horizontal around electric pole measurement obtains reference point A and reference point B in same diameter direction;In the arc length range of each six one circumference length on the two sides of reference point A and reference point B, longitudinal reinforcement is positioned mark, measured concrete cover thickness and arc length data, and paste lead as identification object;Subsequently, two sides are arranged calibration plate, X-ray machine and imaging plate, and the vertical distance of reference point A to X-ray machine is measured;Start X-ray machine and obtain imaging graph by shooting, identify the steel bar to be measured in imaging graph by identification object and measure the projection size of steel bar diameter, and the final steel bar diameter is calculated by parameter correction.The application can be measured to internal reinforcing bar diameter under the premise that not destroying the surface concrete layer of electric pole, with high efficiency, high precision and low cost.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of detection, and particularly relates to a method for detecting diameters of internal steel bars of a power pole based on X-ray imaging technology. BACKGROUND

[0002] As an important part of power transmission network, the structural safety of a power pole is directly related to the stable operation of the power grid and public safety. The main materials of the power pole are cement, wood, concrete and steel. Concrete power poles can meet the high-strength use requirements due to their high strength, durability and non-combustible characteristics, and are widely used.

[0003] The concrete power pole is made of concrete and steel bars, and most of them have a ring cross section. In recent years, accidents of power poles collapsing and hitting pedestrians have occurred from time to time, causing serious safety accidents and property losses. Therefore, it is of great practical significance to regularly detect and evaluate the structural safety performance of the power pole.

[0004] The GB / T 4623-2014 "Ring Concrete Pole" standard clearly stipulates the quality detection of the ring concrete pole, including the mechanical properties and steel bar diameter specification requirements of the pole. On the one hand, the number and diameter specification of the stress steel bars are the most important factors affecting the mechanical properties of the pole. Once the number of steel bars is insufficient or the diameter specification of the steel bars does not meet the design requirements, the mechanical properties of the power pole will be affected. On the other hand, the mechanical property detection of the power pole is a detection test when the component is delivered, that is, the produced power pole is sampled and transported to a qualified detection unit for mechanical property test, which cannot completely represent the quality of the power pole actually used in the field. At present, the mechanical property test cannot be carried out for the power pole that has been put into use, and only the concrete strength, the number and diameter specification of the steel bars can be used to judge the mechanical properties. Therefore, the detection of the diameter of the steel bar in the pole is particularly important. However, the concrete strength can be obtained by the rebound of the rebound hammer, and the number of steel bars can be determined by the steel bar scanner, but there is no non-destructive method for detecting the diameter of the steel bar so far.

[0005] The traditional steel bar diameter detection method mainly adopts the in-situ measurement method. That is, the steel bar part is exposed by chiseling, and the steel bar diameter is measured by a vernier caliper. Although accurate diameter data can be obtained, the power pole structure will be irreversibly damaged, and the cost is high, the efficiency is low, and it is difficult to be widely applied.

[0006] In recent years, with the rapid development of non-destructive testing technology, some new steel detection technologies have emerged. Among them, the use of ray method to detect the diameter of the internal steel of the structure has attracted widespread attention. For example, the patent CN118936377B discloses a method for detecting the diameter of the internal steel of the floor using the ray method, which can detect the diameter of the internal steel of the floor without damaging the ceiling below and the surface decoration layer of the floor. The ray method has the following differences when detecting the diameter of the internal steel of the floor and the electric pole: 1) The cross-sectional form of the component is different. The floor is a rectangular cross-section with uniform thickness. The electric pole is a ring cross-section with non-uniform thickness, with thicker sides and thinner middle; 2) The uniformity of the penetration thickness is different. The floor has a relatively uniform penetration thickness, while the middle of the ring cross-section of the electric pole has two wall thicknesses, and the penetration thickness is not uniform from the middle to the two sides. The non-uniform penetration thickness will directly affect the imaging effect of the ray; 3) The method for determining the position of the steel is different. The steel in the electric pole is arranged in a ring shape, and the distance between the steel and the imaging plate or the ray machine cannot be determined directly using the steel scanner in the above technology. 4) The distance between the calibration sheet and the measured steel is different. If the calibration sheet arrangement method in the above technology is used to detect the diameter of the steel in the electric pole, a single calibration sheet is arranged on the surface of the component near the imaging plate. The detection object in the above technology is the floor, which usually has a thickness of 130-200mm, and the distance between the calibration sheet and the internal steel of the floor is usually not more than 180mm. However, the outer diameter of the electric pole is generally greater than 300mm, and the distance between the calibration sheet and the steel on one side of the ray machine will be greater than 250mm. The greater the distance between the calibration sheet and the measured steel, the greater the error in the calculation of the steel diameter. In summary, the method in the patent cannot be directly used for the detection of the diameter of the steel in the electric pole, and no substantial inspiration can be obtained.

[0007] The patent CN221224619U discloses a detection device for electric poles, which forms a perspective image of the electric pole through an X-ray imaging device, and can check the internal defects of the electric pole and the consistency of the number and diameter of the steel. However, this method only compares the diameters of the steels in the electric pole, and does not involve quantitative detection of the diameter of the steel.

[0008] The patent CN222014206U discloses a device for detecting the state of the internal steel of a concrete electric pole, which can carry a steel detection host to position and climb along the outer wall of the concrete electric pole, thereby detecting the state of the internal steel of the vertical concrete electric pole. The patent document only provides a device that can move vertically to detect the electric pole in use, but does not involve the detection technology of the diameter of the steel.

[0009] In summary, the existing steel bar diameter detection method in the electric pole is difficult to meet the demand of high precision, high efficiency, low cost and non-destructive detection in actual engineering application. Therefore, developing a technology suitable for electric pole steel bar diameter detection has important research value and application prospect. SUMMARY

[0010] The technical problem to be solved by the present application is to provide a steel bar diameter detection method in the electric pole based on X-ray imaging technology, which can efficiently, accurately and at low cost measure the internal steel bar diameter without damaging the concrete layer on the surface of the electric pole.

[0011] In order to solve the above technical problems, the present application provides a steel bar diameter detection method in the electric pole based on X-ray imaging technology, the electric pole is a hollow cylinder, comprising the following steps:

[0012] S1: a soft ruler is horizontally wound around the side of the electric pole for one turn to measure the circumference s of the electric pole, and the starting point of the measurement is defined as the reference point A, and the point corresponding to one-half of the circumference is defined as the reference point B;

[0013] S2: the longitudinal steel bars in the arc length range of one-sixth of the circumference on both sides of the reference points A and B are marked, the concrete cover thickness of the i-th longitudinal steel bar on both sides of the reference point A is measured , and the arc length of the positioning point of the longitudinal steel bar on the side of the electric pole to the reference point A , the concrete cover thickness of the i-th longitudinal steel bar on both sides of the reference point B is measured , and the arc length of the positioning point of the longitudinal steel bar on the side of the electric pole to the reference point B ;

[0014] S3: lead letters are pasted on both sides of each measured longitudinal steel bar as identification objects;

[0015] S4: a calibration plate A is arranged on the tangent plane of the electric pole passing through the reference point A, and a calibration plate B is arranged on the tangent plane of the electric pole passing through the reference point B;

[0016] S5: an X-ray machine is arranged on the side away from the electric pole of the reference point A, an imaging plate is arranged on the side away from the electric pole of the reference point B, and the vertical distance e from the X-ray machine to the reference point A is measured;

[0017] S6: the X-ray machine is started to take pictures, and the shooting results are displayed in real time on the computer to obtain the imaging graph of the internal longitudinal steel bars of the electric pole, the identification objects on both sides of the longitudinal steel bars and the calibration plates, the measured longitudinal steel bars are identified in the imaging graph through the identification objects, the projection size of the longitudinal steel bar diameter on both sides of the reference point A is calibrated in the imaging graph according to the actual size of the calibration plate A, and the projection size of the longitudinal steel bar diameter on both sides of the reference point B is calibrated in the imaging graph according to the actual size of the calibration plate B The projection size of the diameter of the i-th longitudinal reinforcement on both sides of the reference point B is measured after the actual size of the calibration plate B is calibrated in the imaging diagram The measurement is performed;

[0018] S7: The first correction result of the diameter of the i-th longitudinal reinforcement on both sides of the reference point A , according to and the first correction coefficient , is obtained:

[0019] ;

[0020] In the above formula: ;

[0021] The first correction result of the diameter of the i-th longitudinal reinforcement on both sides of the reference point B , according to and the correction coefficient , is obtained:

[0022] ;

[0023] In the above formula: ;

[0024] S8: The second correction coefficient is obtained by substituting the first correction result of the diameter of the longitudinal reinforcement obtained from S7 into the calculation formula of the first correction coefficient instead of the projection size of the diameter of the longitudinal reinforcement, and the final diameter of the longitudinal reinforcement is obtained according to the product of the second correction coefficient and the projection size of the diameter of the longitudinal reinforcement.

[0025] Further, in S1, a cross-sectional height of 500-800mm in the range of the height of the side of the electric pole is selected, and the circumference s is measured by wrapping a flexible ruler around the electric pole once, and the flexible ruler is tightly attached to the electric pole to ensure that the reference point A and the reference point B are at the same height.

[0026] Further, in S2, the vertical projection position of the longitudinal reinforcement on the side of the electric pole is located and the thickness of the concrete protective layer is measured by using the electromagnetic induction method.

[0027] Further, in S4, the width size of the calibration plate is not less than 30mm, and the material is lead or copper, and the calibration plate A and the calibration plate B are staggered by a clear distance of 150-200mm in the height direction, wherein the calibration plate A is arranged at the height position of the reference point A, and the calibration plate B is arranged directly below the reference point B.

[0028] Further, in S5, the arrangement height of the X-ray machine emitting port and the arrangement height of the imaging plate center are located between the calibration plate A and the calibration plate B, the X-ray machine and the imaging plate are adjusted in height by two lifting platform vehicles, the X-ray machine and the imaging plate are arranged on the extension line of the connecting line of the reference point A and the reference point B, and the imaging plate is perpendicular to the extension line, the vertical distance e of the X-ray machine to the reference point A is controlled to be 400-600mm, and the vertical distance of the imaging plate to the reference point B is controlled to be 0-250mm.

[0029] Further, in S5, the effective imaging area of the imaging plate is not less than 300mm×400mm.

[0030] Further, in S6, the voltage setting range of the X-ray machine should be able to cover 60kv-160kv, the voltage setting of the X-ray machine is 100kv at the first shooting, and then the voltage value is adjusted low or high according to the imaging effect display as clear, overexposure or not penetrated.

[0031] Further, in S6, the projection size of the longitudinal steel bar diameter is measured and compared in the imaging image to distinguish the longitudinal steel bars on both sides of the reference point A and the reference point B, wherein the longitudinal steel bars on both sides of the reference point A have larger projection size of the longitudinal steel bar diameter, and vice versa, and then the measured longitudinal steel bars are distinguished accurately by recognizing objects.

[0032] Further, in S6, when measuring the projection size of the longitudinal steel bar diameter in the imaging image, the average value of the measured three sizes is used as the diameter parameter of the measured longitudinal steel bar.

[0033] Further, in S8, the first correction value of the longitudinal steel bar diameter is calculated according to the product of the projection size of the i-th longitudinal steel bar on both sides of the reference point A and the first correction coefficient , the first correction value of the longitudinal steel bar diameter is substituted for the projection size of the longitudinal steel bar diameter , and the second correction coefficient is calculated by substituting the first correction value of the longitudinal steel bar diameter into the calculation formula of the first correction coefficient , the second correction value of the longitudinal steel bar diameter is continued to be calculated according to the product of the projection size and the second correction coefficient , and the second correction value of the longitudinal steel bar diameter is taken as the final calculation result of the i-th longitudinal steel bar diameter on both sides of the reference point A.

[0034] The i-th longitudinal steel bar on both sides of the reference point B is calculated according to the product of the projection size of the i-th longitudinal steel bar on both sides of the reference point B and the first correction coefficient ​​​​​The first correction value of the longitudinal steel bar diameter is calculated by the product of the projection size of the longitudinal steel bar diameter and the first correction coefficient The first correction value of the longitudinal steel bar diameter is calculated by the product of the projection size of the longitudinal steel bar diameter and the first correction coefficient The first correction value of the longitudinal steel bar diameter is calculated by the product of the projection size of the longitudinal steel bar diameter and the first correction coefficient The second correction coefficient is calculated by substituting the first correction value of the longitudinal steel bar diameter into the calculation formula of the first correction coefficient The second correction coefficient is calculated by substituting the first correction value of the longitudinal steel bar diameter into the calculation formula of the first correction coefficient The second correction value of the longitudinal steel bar diameter is calculated by the product of the projection size of the longitudinal steel bar diameter and the second correction coefficient The second correction value of the longitudinal steel bar diameter is calculated by the product of the projection size of the longitudinal steel bar diameter and the second correction coefficient The second correction value of the longitudinal steel bar diameter is calculated by the product of the projection size of the longitudinal steel bar diameter and the second correction coefficient The second correction value of the longitudinal steel bar diameter is calculated by the product of the projection size of the longitudinal steel bar diameter and the second correction coefficient The second correction value of the longitudinal steel bar diameter is calculated by the product of the projection size of the longitudinal steel bar diameter and the second correction coefficient

[0035] The beneficial effects of the present application are as follows:

[0036] 1. The present application can quickly and accurately measure the diameter of the steel bar in the electric pole without damaging the electric pole, and provides reliable technical support for the quality and safety evaluation of the electric pole.

[0037] 2. The detection method used in the present application uses some conventional sizes and the actual width size of the calibration plate that are most easily obtained on the electric pole, such as the circumference of the electric pole, the thickness of the longitudinal steel bar protection layer, the arc length between the positioning position of the longitudinal steel bar on the side of the electric pole and the reference point, the distance between the X-ray machine and the electric pole, and other easily measured size parameters. The correction coefficient of the longitudinal steel bar diameter and the steel bar diameter calculation method based on the correction coefficient and the projection size of the longitudinal steel bar diameter are derived by using the least and most easily measured original parameters, and by skillfully using the geometric principle of similar triangles and the correlation between parameters.

[0038] 3. The steel bar diameter algorithm used in the present application only needs to be calculated once, and even in the case that the actual longitudinal steel bar diameter in the electric pole does not correspond to the design data or in the case that the design data is missing, the real diameter of the longitudinal steel bar can be accurately calculated, and higher calculation efficiency can be obtained with the aid of computer programming assisted calculation.

[0039] 4. The calibration plates are arranged on the left and right sides of the electric pole corresponding to the reference points A and B, and the longitudinal steel bar diameters on the left and right sides of the reference points A and B are respectively calibrated and calculated by using the nearest calibration plate. The principle of nearest calibration makes the calculation result of the steel bar diameter more accurate.

[0040] 5. By setting lead-type markers on both sides of the longitudinal reinforcement being measured, the longitudinal reinforcement being measured can be quickly and accurately located in the imaging image, avoiding the phenomenon of misattributing the "projected size of the diameter of the longitudinal reinforcement being measured" with "the concrete cover thickness of other longitudinal reinforcements and the positioning arc length of the longitudinal reinforcement", thus avoiding calculation errors caused by mixing data between different longitudinal reinforcements. Attached Figure Description

[0041] Figure 1 This is a diagram illustrating the measurement of the perimeter of the utility pole and the marking of reference point A according to the present invention;

[0042] Figure 2 This invention is based on Figure 1 A diagram showing the markings of reference point B after measurement.

[0043] Figure 3 This is a diagram showing the positioning, marking, and arc length measurement of the longitudinal reinforcing bars on both sides of reference point A in this invention;

[0044] Figure 4 This is a diagram showing the positioning, marking, and arc length measurement of the longitudinal reinforcing bars on both sides of reference point B in this invention;

[0045] Figure 5 This is a diagram showing the arrangement of the identification object and calibration plate on one side of reference point A in this invention;

[0046] Figure 6 This is a diagram showing the arrangement of the identification object and calibration plate on one side of reference point B in this invention;

[0047] Figure 7 This is a diagram showing the arrangement of the imaging plate and the X-ray machine of the present invention;

[0048] Figure 8 This is an imaging diagram of the present invention;

[0049] Figure 9 This invention is for Figure 8 Diagram showing the calibration operation of the reference point A side in the mid-image;

[0050] Figure 10 This invention is for Figure 8 Measurement diagram of the longitudinal reinforcement projection dimensions on side A of the reference point in the imaging image;

[0051] Figure 11 This is a schematic diagram of the calculation of reference point A side in this invention;

[0052] Figure 12 This is a schematic diagram of the vertical distance calculation of the present invention;

[0053] Figure 13 This is a diagram showing the result of the calculation of the longitudinal steel bar diameter on the side of reference point A using software in this invention;

[0054] Figure 14 This invention is forFigure 8 the B side of the imaging reference point B calibration operation diagram;

[0055] Figure 15 is the calculation schematic diagram of the B side of the present application to the reference point B; Figure 8 the B side of the imaging reference point B longitudinal reinforcement projection size measurement diagram;

[0056] Figure 16 is the calculation schematic diagram of the B side of the present application to the reference point B;

[0057] Figure 17 is the result diagram of the B side of the present application to the reference point B longitudinal reinforcement diameter calculation using software.

[0058] Figure label explanation: 1, pole; 2, longitudinal reinforcement; 3, calibration plate A; 4, calibration plate B; 5, imaging plate; 6, X-ray machine. DETAILED DESCRIPTION

[0059] The present application will be further described below in conjunction with the drawings and specific embodiments, so that those skilled in the art can better understand the present application and can implement it, but the embodiments are not as a limitation on the present application.

[0060] An embodiment of a pole internal reinforcement diameter detection method based on X-ray imaging technology of the present application, the pole 1 in the embodiment is a hollow cylinder, during detection, first, the circumference of the pole, the arc length of the positioning point of the longitudinal reinforcement on the side of the pole to the reference point and the concrete cover thickness of the longitudinal reinforcement 2 and other conventional sizes that are easiest to obtain are measured, refer to Figures 1-2 As shown, first, a soft ruler is wrapped around the pole at a height of 500mm from the ground, and the circumference s of the pole is 907mm, at the same time, the starting point of the soft ruler is defined as the reference point A, and the point corresponding to one-half of the circumference is defined as the reference point B, then the line connecting the two points A and B passes through the center of the circle formed by the intersection of the soft ruler and the pole, and the length between the two points A and B is equal to the diameter of the above-mentioned circle.

[0061] In addition, calibration plate A 3, calibration plate B 4, imaging plate 5 and X-ray machine 6 are also needed to cooperate to realize the detection.

[0062] Referring to Figures 3-4 As shown, the longitudinal reinforcement of the pole within the arc length range of one-sixth of the circumference on both sides of the reference point A and the reference point B is positioned and marked by the reinforcement scanner, and the concrete cover thickness of the i-th longitudinal reinforcement from left to right on both sides of the reference point A is measured =23mm, =21mm and the arc length of the positioning point of the longitudinal reinforcement on the side of the pole to the reference point A =34mm, = 12mm and the concrete cover thickness of the i-th longitudinal reinforcement from left to right on both sides of the reference point B = 22mm, = 24mm, = 23mm and the arc length of the longitudinal reinforcement from the positioning point on the side of the pole to the reference point B = 98mm, = 45mm, = 38mm;

[0063] Referring to Figures 5-6 , lead letters are pasted on both sides of the longitudinal reinforcement as identification, wherein the lead letters in the shape of Arabic numerals are pasted on the longitudinal reinforcement on both sides of the reference point A, and the lead letters in the shape of English letters are pasted on the longitudinal reinforcement on both sides of the reference point B. The lead letters on different longitudinal reinforcements are staggered in a certain interval from top to bottom, i.e., “1, 2”, “A, B”, “C, D” and “E, F” are pasted in turn from high to low, so that it is easier to quickly and accurately lock the measured longitudinal reinforcement in the imaging image. A calibration plate A with a known width of 36.5mm is arranged on the tangent plane of the pole passing through the reference point A, and a calibration plate B with a known width of 36.0mm is arranged on the tangent plane of the pole passing through the reference point B, wherein the calibration plate A is arranged at the height position of the reference point A, and the calibration plate B is arranged 200mm below the reference point B to avoid overlapping of the calibration plate A and the calibration plate B in the imaging image.

[0064] An X-ray machine is arranged on the side away from the pole of the reference point A, and an imaging plate is arranged on the side away from the pole of the reference point B, referring to Figure 7 , the X-ray machine and the imaging plate are adjusted in height by a lifting platform vehicle, so that the arrangement height of the emission port of the X-ray machine and the arrangement height of the center of the imaging plate are located between the calibration plate A and the calibration plate B, and the X-ray machine and the imaging plate are both arranged on the extension line of the line connecting the reference point A and the reference point B, and the imaging plate is perpendicular to the extension line. The vertical distance e = 540mm from the X-ray machine to the reference point A is measured, and the vertical distance b = 30mm from the imaging plate to the reference point B is measured;

[0065] The X-ray machine is started, the voltage is set to 100KV, the exposure time is 0.1min, and then the shooting is performed, and the imaging image is viewed on the computer, as Figure 8As shown, the longitudinal reinforcement inside the pole, the lead character identification on both sides of the longitudinal reinforcement and the calibration plate can be clearly displayed on the imaging image. The calibration plate with larger projected size in the imaging image is calibration plate A, and the calibration plate with smaller projected size is calibration plate B. The longitudinal reinforcement between the lead character identification “1” and “2” is the projection imaging of the first longitudinal reinforcement from left to right on both sides of the reference point A. The longitudinal reinforcement between the lead character identification “A” and “B”, “C” and “D”, “E” and “F” is the projection imaging of the first, second and third longitudinal reinforcement from left to right on both sides of the reference point B, so that the projection position of the longitudinal reinforcement in the imaging image can be easily matched with the previously measured “thickness of the concrete protective layer of the longitudinal reinforcement” and “arc length of the positioning point of the longitudinal reinforcement on the side of the pole to the reference point”, avoiding the phenomenon that the “projected size of the measured longitudinal reinforcement diameter” is confused with the “thickness of the concrete protective layer of other longitudinal reinforcement” and the “arc length of the positioning point of other longitudinal reinforcement on the side of the pole to the reference point”, thereby avoiding the calculation error caused by the mixed use of data between different longitudinal reinforcements.

[0066] For the reference point A side, the first longitudinal reinforcement from left to right on both sides of the reference point A is taken as an example, and the imaging image is shown in Figures 9-10 As shown, after calibrating the actual size of the calibration plate A as 36.5 mm in the imaging image, the projected size of the measured longitudinal reinforcement diameter on both sides of the reference point A is measured, and the average value of three measurements is =10.8mm;

[0067] During calibration, the longitudinal reinforcement diameters on both sides of the reference point A and the reference point B are respectively calibrated by using the nearest calibration plate. The nearest principle of calibration calculation makes the calculation result of the longitudinal reinforcement diameter more accurate.

[0068] After calibration, the first correction result of the i-th longitudinal reinforcement diameter on both sides of the reference point A is According to the following formula:

[0069] (Formula 1)

[0070] In formula 1, (Formula 2)

[0071] Formula 2 is derived by using the “circumference of the pole”, “arc length of the positioning point of the longitudinal reinforcement on the side of the pole to the reference point” and “thickness of the concrete protective layer of the longitudinal reinforcement” which can be easily measured on the surface of the pole, as well as “distance between the X-ray machine and the pole”, actual width size of the calibration plate, which are the most easily obtained conventional sizes. The formula is derived by skillfully using the geometric principle of similar triangles and the correlation between parameters. The specific derivation process is as follows:

[0072] Referring to Figure 11As shown, based on the geometric proportions of similar triangles, the "actual size c" and the "projected size of the measured longitudinal reinforcement on the focal plane of calibration plate A" can be obtained. The ratio is equal to the vertical distance from the X-ray machine to the focal plane containing the center of the longitudinal steel bar being measured. "and "the perpendicular distance from the X-ray machine to the focal plane of calibration plate A The ratio of "", that is:

[0073] (Formula 3)

[0074] Among them, "the projected size of the longitudinal reinforcement under test on the focal plane of calibration plate A" is the projected size of the longitudinal reinforcement under test measured after calibration plate A is calibrated. "Vertical distance from the X-ray machine to the focal plane of calibration plate A" "That is, the vertical distance e from the X-ray machine to the reference point A; "the vertical distance from the X-ray machine to the focal plane containing the center of the longitudinal reinforcement being measured." "" refers to the vertical distance e from the X-ray machine to the reference point A and the vertical distance from the center of the i-th longitudinal steel bar being measured to the plane containing the reference point A. The sum of

[0075] . (Formula 4)

[0076] Reference Figure 12 As shown, the perpendicular distance from the center of the measured longitudinal reinforcement to the plane containing the reference point A is... The distance from the pole's perimeter *s* to the reference point A can be determined based on the pole's circumference *s* and the arc length from the positioning point of the longitudinal reinforcement being measured on the side of the pole to the reference point A. The thickness of the concrete cover for the longitudinal reinforcing bars being measured. The calculation is as follows:

[0077] (Formula 5)

[0078] Formula 5 is used to calculate the vertical distance. At that time, because the actual size c of the longitudinal reinforcement of the utility pole being measured differs from the projected size... The measurements are relatively close, with a difference generally not exceeding 2mm. For the initial calculation, the projected dimensions of the longitudinal reinforcing bars being measured can be used. The actual dimensions of the longitudinal reinforcement being measured are substituted into the equation, and subsequent iterative correction calculations are performed to simplify the calculation and reduce errors, resulting in:

[0079] (Formula 6)

[0080] Substituting Formula 6 into Formula 4 yields Formula 2.

[0081] Calculate according to Formula 2, =10.8mm =34mm Substituting 23mm, s=907mm, and e=540mm into the calculation, we obtain the first correction factor for the diameter calculation of the first longitudinal reinforcement bar from left to right on both sides of benchmark point A. The value is 1.059. Based on Formula 1, the first corrected result for calculating the longitudinal reinforcement diameter is... =11.4mm. Since the arc length from the positioning point of the longitudinal rebar being measured on the side of the utility pole to the reference point is only 34mm, meaning the longitudinal rebar being measured is relatively close to reference point A, the projected size of the diameter of the longitudinal rebar being measured is... Compared with the first correction result It's also quite close. The first corrected result for the longitudinal reinforcement diameter obtained from Formula 1. Substituting the projected dimension of the longitudinal reinforcement diameter, 11.4 mm, into Formula 2 yields the second correction factor. After retaining three decimal places, the result is still 1.059, which is equal to the first correction factor. The final longitudinal reinforcement diameter is then obtained by multiplying the second correction factor by the projected dimension of the longitudinal reinforcement diameter. It is 11.4mm.

[0082] Finally, a self-developed software was used to calculate the correction results for the rebar diameter, such as... Figure 13 As shown, the software calculated the final longitudinal steel bar diameter to be 11.4 mm, which is consistent with the above calculation results.

[0083] According to the national standard GB / T1499.2-2024 "Steel for Reinforced Concrete - Part II: Hot-rolled Ribbed Steel Bars", longitudinal steel bars with a nominal diameter of 12 mm and a nominal size of 11.5 mm, with an allowable deviation of 0.4 mm, meaning steel bars with a diameter between 11.1 and 11.9 mm, can be classified as steel bars with a nominal diameter of 12 mm. Therefore, in this embodiment, the first longitudinal steel bar from left to right on both sides of reference point A is a steel bar with a nominal diameter of 12 mm. The other longitudinal steel bars on both sides of reference point A can also be measured and calculated according to the above process.

[0084] Regarding one side of benchmark point B, this embodiment takes the first longitudinal rebar from left to right on both sides of benchmark point B as an example, such as... Figures 14-15 As shown, after calibration according to the actual size of calibration plate B (36.0 mm) in the imaging diagram, the projected dimensions of the longitudinal steel bars to be measured on both sides of the reference point B are measured, and the average value of the three measurements is taken. =12.2mm;

[0085] The first correction result used for calculating the diameter of the i-th longitudinal reinforcement bar on both sides of benchmark point B after calibration. The calculation formula is as follows:

[0086] (Equation 7)

[0087] In Equation 7,

[0088] (Equation 8)

[0089] The specific derivation process of Equation 8 is as follows:

[0090] Referring to Figure 16 , according to the geometric proportion relationship of similar triangles, the size ratio of "the real size c" to "the projection size of the measured longitudinal reinforcement on the focal plane of the calibration plate B" is equal to the ratio of "the vertical distance from the X-ray machine to the focal plane where the center of the measured longitudinal reinforcement is located " to "the vertical distance from the X-ray machine to the focal plane of the calibration plate B ", that is:

[0091] (Equation 9)

[0092] Similarly, "the projection size of the measured longitudinal reinforcement on the focal plane of the calibration plate B" is the projection size of the measured longitudinal reinforcement measured after calibration of the calibration plate B ; "the vertical distance from the X-ray machine to the focal plane of the calibration plate B " is the sum of the vertical distance e from the measured X-ray machine to the reference point B and the diameter of the telegraph pole, that is,

[0093] (Equation 10)

[0094] "The vertical distance from the X-ray machine to the focal plane where the center of the measured longitudinal reinforcement is located " refers to the vertical distance from the X-ray machine to the focal plane of the calibration plate B minus the vertical distance from the center of the measured longitudinal reinforcement to the plane where the reference point B is located , that is,

[0095] (Equation 11)

[0096] Substituting Equation 10 and Equation 11 into Equation 9 gives:

[0097] (Equation 12)

[0098] According to the same method, the vertical distance from the center of the measured longitudinal reinforcement to the plane where the reference point B is located is calculated as follows:

[0099] (Equation 13)

[0100] Substituting Formula 13 into Formula 12, we obtain Formula 8.

[0101] Calculate according to Formula 8, =12.2mm =98mm Substituting 22mm, s=907mm, and e=540mm into the calculation, we obtain the first correction factor for the diameter calculation of the first longitudinal reinforcement bar from left to right on both sides of benchmark point B. The value is 0.934. Based on Formula 7, the first corrected result for calculating the longitudinal reinforcement diameter is... =11.4mm, the first correction result of the longitudinal reinforcement diameter obtained from Formula 7. Substituting the projected dimension of the longitudinal reinforcement diameter, 11.4 mm, into Formula 8 yields the second correction factor. After rounding to three decimal places, the result is 0.935. The final longitudinal reinforcement diameter is then obtained by multiplying the second correction factor by the projected dimension of the longitudinal reinforcement diameter. The value is 11.4 mm. From the above calculation results, it can be seen that the second correction factor... Compared with the first correction factor The calculation results show only minor changes, appearing in the third decimal place. The first and second correction results for the longitudinal reinforcement diameter calculation remain unchanged when only one decimal place is retained, indicating that the method of substituting the projected size into the calculation is feasible when the actual diameter of the longitudinal reinforcement is unknown.

[0102] The final rebar diameter, calculated using the same self-developed software, was 11.4 mm. Figure 17 As shown, the results are consistent with the calculations above. According to the national standard GB / T1499.2-2024 "Steel for Reinforced Concrete - Part II: Hot-rolled Ribbed Steel Bars", the first longitudinal steel bar from left to right on both sides of reference point B in this embodiment is a steel bar with a nominal diameter of 12 mm. The other longitudinal steel bars on both sides of reference point B can also be measured and calculated according to the above process.

[0103] The embodiments described above are merely preferred embodiments for fully illustrating the present invention, and the scope of protection of the present invention is not limited thereto. Equivalent substitutions or modifications made by those skilled in the art based on the present invention are all within the scope of protection of the present invention.

Claims

1. A method for detecting the diameter of a reinforcing bar inside a utility pole based on X-ray imaging technology, the utility pole being a hollow cylinder, characterized in that, It comprises the following steps: S1: adopt soft ruler to measure the circumference s of the electric pole, and define the starting point of the measurement as the reference point A and the point corresponding to half the circumference as the reference point B; S2: Positioning marks the longitudinal reinforcement inside the pole within the range of the arc length of each six-sixth circumference on both sides of the reference point A and the reference point B, and measure the concrete cover thickness of the i-th longitudinal reinforcement on both sides of the reference point A and the arc length of the positioning point of the longitudinal reinforcement on the side of the pole to the reference point A , measure the concrete cover thickness of the i-th longitudinal reinforcement on both sides of the reference point B and the arc length of the positioning point of the longitudinal reinforcement on the side of the pole to the reference point B ; S3: paste lead letters as identification on both sides of each measured longitudinal reinforcement; S4: arrange calibration plate A on the tangent plane of the electric pole passing through the reference point A, and arrange calibration plate B on the tangent plane of the electric pole passing through the reference point B; S5: arrange the X-ray machine on the side of the reference point A away from the electric pole, arrange the imaging plate on the side of the reference point B away from the electric pole, and measure the vertical distance e from the X-ray machine to the reference point A; S6: start the X-ray machine to take pictures, the shooting results are displayed on the computer in real time, the imaging graph of the longitudinal reinforcement inside the electric pole, the identified objects on both sides of the longitudinal reinforcement and the calibration plate is obtained, the measured longitudinal reinforcement is identified in the imaging graph through the identified objects, the projection size of the diameters of the longitudinal reinforcement on both sides of the reference point A is measured in the imaging graph after the actual size of the calibration plate A is calibrated the projection size of the diameters of the longitudinal reinforcement on both sides of the reference point B is measured in the imaging graph after the actual size of the calibration plate B is calibrated the projection size of the diameters of the longitudinal reinforcement on both sides of the reference point B is measured in the imaging graph after the actual size of the calibration plate B is calibrated S7: the first correction result of the diameter of the i-th longitudinal reinforcement on both sides of the reference point A , according to and the first correction coefficient : ； In the above formulae: ; First correction result of the diameter of the i-th longitudinal reinforcement on both sides of the reference point B , according to and the first correction coefficient is obtained: ； In the above formulae: ; S8: replace the projection size of the longitudinal reinforcement diameter with the first correction result of the longitudinal reinforcement diameter obtained from S7 into the calculation formula of the first correction coefficient to obtain the second correction coefficient, and then obtain the final steel reinforcement diameter according to the product of the second correction coefficient and the projection size of the longitudinal reinforcement diameter.

2. The method for detecting the diameter of the internal reinforcement of a utility pole based on X-ray imaging technology according to claim 1, wherein, In S1, the soft ruler is wrapped around the electric pole at a height of 500-800mm from the ground to measure the circumference s, and the soft ruler is tightly attached to the electric pole during the measurement to ensure that the reference point A and the reference point B are at the same height.

3. The method for detecting the diameter of the internal reinforcement of a telegraph pole based on X-ray imaging technology according to claim 1, characterized in that, In S2, the electromagnetic induction method is used to locate the vertical projection position of the longitudinal reinforcement on the side of the electric pole and measure the concrete cover thickness by using the steel reinforcement scanner.

4. The method for detecting the diameter of the internal reinforcement of a telegraph pole based on X-ray imaging technology according to claim 1, wherein, In S4, the width of the calibration plate is not less than 30mm, and the material is lead or copper. The calibration plate A and the calibration plate B are staggered by a clear distance of 150-200mm in the height direction, wherein the calibration plate A is arranged at the height position of the reference point A, and the calibration plate B is arranged directly below the reference point B.

5. The method for detecting the diameter of the internal reinforcement of a telegraph pole based on X-ray imaging technology according to claim 1, wherein, In S5, the arrangement height of the X-ray machine emitting port and the arrangement height of the center of the imaging plate are located between the calibration plate A and the calibration plate B. The X-ray machine and the imaging plate are adjusted in height by two lifting platform vehicles. The X-ray machine and the imaging plate are arranged on the extension line of the connecting line of the reference point A and the reference point B, and the imaging plate is perpendicular to the extension line. The vertical distance e from the X-ray machine to the reference point A is controlled within 400-600mm, and the vertical distance from the imaging plate to the reference point B is controlled within 0-250mm.

6. The method for detecting the diameter of the internal reinforcement of a telegraph pole based on X-ray imaging technology according to claim 1, wherein, In S5, the effective imaging area of the imaging plate is not less than 300mm×400mm.

7. The method for detecting the diameter of the internal reinforcement of a telegraph pole based on X-ray imaging technology according to claim 1, wherein, In S6, the voltage setting range of the X-ray machine should cover 60kv-160kv. The voltage setting of the X-ray machine is 100kv during the first shooting, and then the voltage value is adjusted lower or higher according to the clear, overexposure or non-penetration of the imaging effect.

8. The method for detecting the diameter of a reinforcing bar inside a utility pole based on an X-ray imaging technique according to claim 1, wherein In S6, the projection size of the longitudinal reinforcement diameter is measured and compared in the imaging image to distinguish the longitudinal reinforcement on both sides of the reference point A and the reference point B. The longitudinal reinforcement with larger projection size of the longitudinal reinforcement diameter is on both sides of the reference point A, and vice versa. Then the measured longitudinal reinforcement is accurately distinguished through the identification.

9. The method for detecting the diameter of the internal reinforcement of a telegraph pole based on X-ray imaging technology according to claim 1, wherein, In S6, when measuring the projection size of the longitudinal reinforcement diameter in the imaging image, the average value of the measured three sizes is used as the diameter parameter of the measured longitudinal reinforcement.

10. The method for detecting the diameter of a reinforcing bar inside a power pole based on an X-ray imaging technique according to claim 1, wherein In S8, the i-th longitudinal reinforcement on both sides of reference point A is based on the projected dimensions. and the first correction factor The product is used to calculate the first correction value for the diameter of the longitudinal reinforcement. The first correction value for the diameter of the longitudinal reinforcement bars. Replaces the projected diameter of longitudinal reinforcing bars And substitute in the first correction factor The second correction coefficient is calculated from the formula. According to the projection size and the second correction factor The product is used to calculate the second correction value for the longitudinal reinforcement diameter. ,Will The final calculation result of the diameter of the i-th longitudinal reinforcement bar on both sides of the reference point A; The i-th longitudinal reinforcement on both sides of reference point B is based on the projected dimensions. and the first correction factor The product is used to calculate the first correction value for the diameter of the longitudinal reinforcement. The first correction value for the diameter of the longitudinal reinforcement bars. Replaces the projected diameter of longitudinal reinforcing bars And substitute in the first correction factor The second correction coefficient is calculated from the formula. According to the projection size and the second correction factor The product is used to calculate the second correction value for the rebar diameter. ,Will This serves as the final calculation result for the diameter of the i-th longitudinal reinforcement bar on both sides of reference point B.

Images