A method for evaluating safety of pole climbing based on structural deformation and material performance

Abstract

This invention provides a method for evaluating the safety of climbing utility poles based on structural deformation and material properties. The method includes: collecting the basic parameters of the utility pole; calculating the pole's tilt angle based on the basic parameters and issuing a hazard warning based on the tilt angle; calculating geometric evaluation indicators based on the basic parameters and the tilt angle; calculating the pole's wave velocity based on the basic parameters, judging the material quality, and calculating material performance indicators; calculating the pole's burial depth based on the wave velocity, judging the burial depth quality, and calculating a burial depth safety index; calculating a comprehensive climbing safety index based on the geometric evaluation index, material performance index, and burial depth safety index, and classifying the utility pole's safety based on the comprehensive climbing safety index. This method quantifies latent deterioration, forming a standardized evaluation system, avoiding misjudgments, thereby improving the accuracy and objectivity of pole climbing safety evaluation and effectively reducing operational safety risks.

Description

Technical Field

[0001] This invention relates to the field of power facility safety evaluation technology, and in particular to a method for evaluating the safety of climbing power poles based on structural deformation and material properties. Background Technology

[0002] Utility poles are the core supporting structure of overhead transmission lines, and their safety directly affects the safety of power maintenance personnel climbing them. According to the "Electric Power Safety Work Regulations" (DL / T477-2015), the stability of the pole must be assessed before climbing operations; however, existing methods have the following problems: Relying primarily on visual inspection and experience, and lacking quantitative standards: On-site judgments are often made subjectively based on visual observation of tilting, apparent defects, and loose soil, resulting in large errors, poor repeatability, and difficulty in establishing unified entry thresholds. According to accident statistics, pole climbing accidents caused by inaccurate pole safety assessments account for 32.7% of power operation accidents, mainly due to the following limitations: 1. Microcracks and early deterioration are not visible: a good appearance does not mean structural safety; microcracks in concrete, interfacial debonding, and freeze-thaw damage will significantly reduce stiffness and load-bearing capacity, but are difficult to identify visually.

[0003] 2. The embedment depth is invisible but has a critical impact: The embedment depth of the pole directly affects the overturning resistance and bending moment transfer effect. There are usually no direct measurement methods on site, and estimation is based on drawings or experience, which is risky.

[0004] 3. Data integration is not achieved: Even if geometric or material indicators can be measured separately, there is still a lack of engineering methods to verify and comprehensively score multi-source information in a unified algorithm, making it difficult to form an executable criterion of "safety - conditional safety - prohibition of climbing". Summary of the Invention

[0005] The purpose of this invention is to provide a method for evaluating the safety of climbing utility poles based on structural deformation and material properties. By establishing a quantitative and integrated evaluation system with multi-index step-by-step verification, the accuracy and objectivity of the safety evaluation of climbing operations on concrete utility poles can be improved.

[0006] To achieve the above objectives, the present invention provides the following solution: A method for evaluating the safety of climbing utility poles based on structural deformation and material properties includes the following steps: The basic parameters of the utility poles are collected using a detection device; Calculate the pole tilt angle based on the basic parameters, and issue a hazard warning based on the pole tilt angle; Calculate geometric evaluation indicators based on basic parameters and pole tilt angle; Calculate the pole wave velocity based on the basic parameters, determine the material quality of the pole based on the pole wave velocity, and calculate the material performance indicators. The burial depth of the pole is calculated based on the pole wave velocity, and the burial depth quality of the pole is judged based on the burial depth, and the burial depth safety index is calculated. The comprehensive safety index for climbing the pole is calculated based on geometric evaluation indicators, material performance indicators, and burial depth safety indicators, and the poles are then classified according to their safety levels.

[0007] Optionally, the detection device includes: a tilt module, a laser ranging module, and an acceleration-elastic wave acquisition system; the tilt module is arranged perpendicularly on the utility pole to determine the overall tilt of the utility pole; the laser ranging module is used to determine the distance between the exposed length of the utility pole and the elevation of key components; the acceleration-elastic wave acquisition system includes: an impact hammer, an accelerometer, and a data acquisition unit, and is used to acquire longitudinal wave propagation and reflection signals.

[0008] Optionally, the basic parameters include: tilt parameters, exposed length, travel time of the top of the pole reflected echo, and travel time of the bottom of the pole reflected echo.

[0009] Optionally, the pole tilt angle is calculated based on the basic parameters, and a hazard warning is issued based on the pole tilt angle, including: Calculate the pole's tilt angle based on the tilt parameters; When the angle of inclination of the utility pole does not exceed 5°, it is determined that the utility pole is not in danger of tilting. When the angle of inclination of the utility pole is greater than 5°, it is determined that the utility pole is in danger of tilting and a danger warning is issued.

[0010] Optionally, geometric evaluation indicators are calculated based on foundation parameters and pole tilt angle, including: The weight of the pole is determined based on its exposed length. The geometric evaluation index is calculated based on the pole weight and the pole tilt angle; the formula for calculating the geometric evaluation index is as follows: ; where m L Let g be the weight of the utility pole, and g be the acceleration due to gravity. θ The angle of inclination of the utility pole. C This is the compression correction factor for the cylindrical cross-section. L The exposed length, D The diameter of the pole. P The wind speed and pressure are level 12.

[0011] Optionally, the pole wave velocity is calculated based on the basic parameters, and the material quality of the pole is determined based on the pole wave velocity, and material performance indicators are calculated, including: The pole wave velocity is calculated based on the travel time of the reflected echo from the pole top and the exposed length; the formula for calculating the pole wave velocity is: ; where Δt 上 The travel time of the echo reflected from the top of the pole is given by L, which is the exposed length. When the wave velocity of the utility pole is lower than the safe wave velocity, the material quality is judged to be unqualified and a danger warning is issued. When the wave velocity of the utility pole is not lower than the safe wave velocity, the material quality is deemed qualified and the material performance indicators are calculated; the formula for calculating the material performance indicators is: Where k is the evaluation correction coefficient, and v 临界 For safe wave speed.

[0012] Optionally, the pole burial depth is calculated based on the pole wave velocity, and the burial depth quality is assessed and burial depth safety indicators are calculated based on the pole burial depth, including: The pole burial depth is calculated based on the pole wave velocity and the travel time of the reflected echo from the pole base; the formula for calculating the pole burial depth is: ;in, v For the wave velocity of the utility pole, Δt 下 This refers to the travel time of the echo reflected from the bottom of the pole. When the burial depth of the utility pole is lower than the baseline, the burial depth quality is deemed unqualified and a danger warning is issued; the baseline is 0.7 + 0.1L, where L is the exposed length. When the burial depth of the utility pole is not lower than the baseline, the burial depth quality is deemed qualified, and the burial depth safety index is calculated. The formula for calculating the burial depth safety index is: ;in, H This refers to the actual burial depth.

[0013] Optionally, a comprehensive safety index for climbing the pole is calculated based on geometric evaluation indicators, material performance indicators, and burial depth safety indicators, and the pole is then classified into safety levels based on this comprehensive safety index, including: The formula for calculating the comprehensive safety index for pole climbing is: ;in, A Geometric evaluation index B For material performance indicators, C For burial depth safety indicators, α and β All are weighting coefficients; when SI A value ≥0.85 is considered safe, and climbing the pole is permitted. When 0.7≤ SI When the value is less than 0.8, it is considered safe to operate under limited load and time conditions. when SI A reading less than 0.8 indicates danger and climbing the pole is prohibited.

[0014] According to specific embodiments provided by the present invention, the following technical effects are disclosed: The present invention provides a method for safety evaluation of climbing utility poles based on structural deformation and material properties. This method includes: collecting basic parameters of the utility pole using a detection device; calculating the pole's tilt angle based on the basic parameters and issuing a hazard warning based on the tilt angle; calculating geometric evaluation indicators based on the basic parameters and the pole's tilt angle; calculating the pole's wave velocity based on the basic parameters, determining the material quality of the utility pole based on the wave velocity, and calculating material performance indicators; calculating the pole's burial depth based on the wave velocity, determining the burial depth quality based on the burial depth, and calculating a burial depth safety indicator; calculating a comprehensive climbing safety indicator based on the geometric evaluation indicator, material performance indicator, and burial depth safety indicator, and classifying the utility pole for safety based on the comprehensive climbing safety indicator. This method obtains key safety parameters of the utility pole's geometry, material, and burial depth through integrated non-destructive testing and establishes a quantitative fusion evaluation system with multi-indicator step-by-step verification, improving the accuracy, objectivity, and standardization of safety evaluation for climbing concrete utility poles. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a flowchart of the pole climbing safety evaluation method based on structural deformation and material properties of the present invention. Figure 2 This is a schematic diagram illustrating the safety evaluation principle for climbing utility poles according to an embodiment of the present invention. Figure 3 This is a schematic diagram of the detection device according to an embodiment of the present invention. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0019] like Figure 1 and Figure 2As shown in the figure, this invention provides a method for evaluating the safety of climbing utility poles based on structural deformation and material properties, including the following steps: Step 100: Collect the basic parameters of the utility pole using a detection device; Step 200: Calculate the pole tilt angle based on the basic parameters, and issue a hazard warning based on the pole tilt angle; Step 300: Calculate the geometric evaluation index based on the basic parameters and the pole tilt angle; Step 400: Calculate the pole wave velocity based on the basic parameters, determine the material quality of the pole based on the pole wave velocity, and calculate the material performance indicators; Step 500: Calculate the pole burial depth based on the pole wave velocity, determine the burial depth quality of the pole based on the burial depth, and calculate the burial depth safety index; Step 600: Calculate the comprehensive safety index for climbing the pole based on the geometric evaluation index, material performance index, and burial depth safety index, and classify the pole for safety based on the comprehensive safety index for climbing the pole.

[0020] In the specific implementation process, the detection device in step 100 is an integrated portable device, such as... Figure 3 As shown, it includes: two tilt modules, one laser ranging module, and an acceleration-elastic wave acquisition system. The two tilt modules are arranged perpendicularly to the utility pole, with the direction along the cable route and the vertical direction as two fixed standard directions, and are used to measure the tilt parameters of the utility pole. θ 1 and θ 2. The laser ranging module is aligned with the top of the pole to determine the exposed length of the utility pole and the distance between the elevation of key components. The acceleration-elastic wave acquisition system includes an impact hammer, an accelerometer, and a data acquisition unit. The system emits elastic wave signals to both the top and bottom of the pole and acquires the reflected echo signals.

[0021] Specifically, the basic parameters include: tilt parameters, exposed length, travel time of the reflected echo from the top of the pole, and travel time of the reflected echo from the bottom of the pole.

[0022] In the specific implementation process, step 200 first determines the tilt parameters. θ 1 and θ 2. Calculate the pole's tilt angle using the following formula: When the tilt angle of the utility pole does not exceed the minimum safety requirement of 5°, it is determined that there is no danger of tilting; when the tilt angle of the utility pole is greater than 5°, it is determined that there is a danger of tilting and a hazard warning is issued.

[0023] In the specific implementation process, the geometric evaluation index in step 300 uses the maximum lateral force in the vertical direction as the benchmark value. It is calculated by introducing the force situation after the geometric deformation of the pole. The index range is [0,1], from 0 to 1, which represents the quality from poor to good. First, under the condition that the pole is not in danger of tilting, the pole weight is automatically matched according to the measured exposed length. The specific matching rules are shown in Table 1.

[0024] Table 1. Overview of Pole Length and Mass

[0025] Then, based on the pole weight and pole tilt angle, the geometric evaluation index is calculated using the following formula: ; Where, m L Let g be the weight of the utility pole, and g be the acceleration due to gravity. θ The angle of inclination of the utility pole. C This is the compression correction factor for the cylindrical section (taken as 0.9). L The exposed length, D This is the diameter of the utility pole (default is 0.2m). P Wind speed and pressure at level 12 (take 690) P a).

[0026] In the specific implementation process, step 400 measures the echo signal and its time difference towards the top of the pole and the echo signal and its time difference towards the bottom of the pole, and calculates the pole wave velocity based on the exposed length L. The calculation formula is as follows: ; where Δt 上 The travel time of the reflected echo from the pole top is denoted as L, and the exposed length is L. When the pole has transverse cracks or material deterioration, the wave velocity will decrease significantly. In this embodiment, the structural parameters are evaluated based on the concrete design value C50. The safe P-wave velocity is preset to 3600 m / s. The safety index of concrete material performance is evaluated by comparing wave velocities. When the pole wave velocity is lower than the safe wave velocity, the material quality is judged to be unqualified and a danger warning is issued; when the pole wave velocity is not lower than the safe wave velocity, the material quality is judged to be qualified and the material performance index is calculated. The calculation formula is: ; Where k is the evaluation correction coefficient, v 临界 For a safe P-wave velocity, the index ranges from [0,1], with 0 to 1 representing quality from poor to good. At a safe P-wave velocity of 4200 m / s, the index value reaches 0.99725.

[0027] In the specific implementation process, step 500 calculates the pole burial depth based on the pole wave velocity and the measured echo travel time at the pole base, using the following formula: ;in, vFor the wave velocity of the utility pole, Δt 下 The travel time of the reflected echo from the pole base is given. Then, using 0.7 + 0.1L as a baseline, the pole burial depth H is determined. If the pole burial depth is lower than the baseline, the burial depth quality is deemed unqualified and a danger warning is issued; if the pole burial depth is not lower than the baseline, the burial depth quality is deemed qualified, and the burial depth safety index is calculated using the following formula: ; in, H This refers to the actual burial depth.

[0028] In the specific implementation process, step 600 is based on the obtained independent indicators. A , B , C The formula for calculating the overall safety index for pole climbing is as follows: ; in, A Geometric evaluation index B For material performance indicators, C For burial depth safety indicators, α and β Both are weighting coefficients; in this embodiment, both weighting coefficients are set to 0.5, i.e. Then, based on different management needs, the utility poles are classified into safety levels according to the comprehensive safety indicators for climbing the poles. SI A value ≥0.85 is considered safe, allowing climbing; when 0.7 ≤ SI When the value is <0.8, it is considered conditionally safe; therefore, load and time-limited operation are permitted. SI A reading less than 0.8 indicates danger and climbing the pole is prohibited.

[0029] The beneficial effects of this invention are as follows: 1) A portable testing device integrating an inclination module, a laser ranging module, and an acceleration-elastic wave acquisition system can simultaneously acquire basic parameters such as pole tilt parameters, exposed length, and pole top / bottom reflection echo time through a single non-destructive operation. It can also calculate key safety parameters such as tilt angle, concrete wave velocity, and actual burial depth, avoiding the cumbersome operation of multi-stage decentralized testing. At the same time, it reduces the on-site work time and safety risks for testing personnel, realizes multi-parameter integrated non-destructive testing, and improves the efficiency and safety of testing operations. 2) It abandons the traditional subjective evaluation method that relies on visual observation and experience estimation. It constructs a standardized quantitative evaluation system through geometric deformation index, material performance index, burial depth safety index and comprehensive safety index. At the same time, it clarifies the threshold and grading standards of each parameter and unifies the access threshold for pole climbing operations, thereby greatly reducing evaluation error and improving the repeatability and objectivity of the results. 3) By characterizing the longitudinal wave velocity of concrete, the material properties are transformed into measurable material performance indicators, which transform early deterioration problems such as micro-cracks inside concrete, interface debonding, and freeze-thaw damage that are invisible to the naked eye. This enables accurate identification and early warning of early safety hazards in pole structures, and can avoid pole climbing accidents caused by hidden deterioration of pole materials in advance, thereby improving safety early warning capabilities. 4) By normalizing the evaluation indicators related to geometry, materials, and burial depth to a numerical range of [0,1], the indicator system is unified and the evaluation results are standardized, which facilitates the standardization and application of the industry. 5) Based on comprehensive safety indicators, utility poles are classified into three levels: "safe, conditionally safe, and dangerous," and corresponding differentiated handling suggestions are given for "pole climbing permitted, load-limited and time-limited operation, and pole climbing prohibited." This avoids the safety risk of severely defective poles being mistakenly judged as climbable, while also taking into account the efficiency requirements of power maintenance operations.

[0030] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0031] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A method for evaluating the safety of climbing utility poles based on structural deformation and material properties, characterized in that, Includes the following steps: The basic parameters of the utility poles are collected using a detection device; The pole tilt angle is calculated based on the aforementioned basic parameters, and a hazard warning is issued based on the pole tilt angle. Calculate the geometric evaluation index based on the basic parameters and the pole tilt angle; The wave velocity of the utility pole is calculated based on the aforementioned basic parameters. The material quality of the utility pole is then determined based on the wave velocity, and the material performance indicators are calculated. The burial depth of the pole is calculated based on the pole wave velocity, and the burial depth quality of the pole is judged based on the burial depth, and the burial depth safety index is calculated. The comprehensive safety index for climbing the pole is calculated based on the geometric evaluation index, the material performance index, and the burial depth safety index, and the pole is then classified for safety based on the comprehensive safety index for climbing the pole.

2. The method for evaluating the safety of climbing utility poles based on structural deformation and material properties according to claim 1, characterized in that, The detection device includes: a tilt module, a laser ranging module, and an acceleration-elastic wave acquisition system; the tilt module is arranged perpendicularly to the utility pole and is used to determine the overall tilt of the utility pole; the laser ranging module is used to determine the exposed length of the utility pole and the distance between the elevation of key components; the acceleration-elastic wave acquisition system includes: an impact hammer, an accelerometer, and a data acquisition unit, and is used to acquire longitudinal wave propagation and reflection signals.

3. The method for evaluating the safety of climbing utility poles based on structural deformation and material properties according to claim 1, characterized in that, The basic parameters include: tilt parameters, exposed length, travel time of the reflected echo from the top of the pole, and travel time of the reflected echo from the bottom of the pole.

4. The method for evaluating the safety of climbing utility poles based on structural deformation and material properties according to claim 3, characterized in that, Calculate the pole tilt angle based on the aforementioned basic parameters, and issue a hazard warning based on the pole tilt angle, including: Calculate the pole's tilt angle based on the tilt parameters; When the tilt angle of the pole does not exceed 5°, it is determined that the pole is not in danger of tilting. When the tilt angle of the pole is greater than 5°, it is determined that the pole is in danger of tilting and a danger warning is issued.

5. The method for evaluating the safety of climbing utility poles based on structural deformation and material properties according to claim 3, characterized in that, Geometric evaluation indicators are calculated based on the aforementioned basic parameters and the pole tilt angle, including: The weight of the pole is determined based on the exposed length; The geometric evaluation index is calculated based on the pole's weight and its tilt angle; the formula for calculating the geometric evaluation index is as follows: ; where m L Let g be the weight of the utility pole, and g be the acceleration due to gravity. θ The angle of inclination of the utility pole. C This is the compression correction factor for the cylindrical cross-section. L The exposed length, D The diameter of the pole. P The wind speed and pressure are level 12.

6. The method for evaluating the safety of climbing utility poles based on structural deformation and material properties according to claim 3, characterized in that, The wave velocity of the utility pole is calculated based on the aforementioned basic parameters. The material quality of the utility pole is then determined based on the wave velocity, and material performance indicators are calculated, including: The wave velocity of the pole is calculated based on the travel time of the reflected echo from the pole top and the exposed length; the formula for calculating the wave velocity of the pole is: ; where Δt 上 The travel time of the echo reflected from the top of the pole is given by L, which is the exposed length. When the wave velocity of the pole is lower than the safe wave velocity, the material quality is determined to be unqualified and a danger warning is issued. When the wave velocity of the utility pole is not lower than the safe wave velocity, the material quality is deemed qualified and the material performance indicators are calculated; the formula for calculating the material performance indicators is: Where k is the evaluation correction coefficient, and v 临界 For safe wave speed.

7. The method for evaluating the safety of climbing utility poles based on structural deformation and material properties according to claim 3, characterized in that, The burial depth of the utility pole is calculated based on the pole wave velocity. The burial depth quality of the utility pole is assessed based on the burial depth, and the burial depth safety index is calculated, including: The burial depth of the pole is calculated based on the wave velocity of the pole and the travel time of the reflected echo from the pole base; the formula for calculating the burial depth of the pole is: ;in, v For the wave velocity of the utility pole, Δt 下 This refers to the travel time of the echo reflected from the bottom of the pole. When the burial depth of the pole is lower than the baseline, the burial depth quality is deemed unqualified and a danger warning is issued; the baseline is 0.7 + 0.1L, where L is the exposed length; When the burial depth of the pole is not lower than the baseline, the burial depth quality is deemed qualified, and the burial depth safety index is calculated; the calculation formula for the burial depth safety index is: ;in, H This refers to the actual burial depth.

8. The method for evaluating the safety of climbing utility poles based on structural deformation and material properties according to claim 1, characterized in that, A comprehensive safety index for pole climbing is calculated based on the geometric evaluation index, the material performance index, and the burial depth safety index. The pole is then classified into safety levels based on this comprehensive safety index, including: The formula for calculating the comprehensive safety index for pole climbing is as follows: ;in, A Geometric evaluation index B For material performance indicators, C For burial depth safety indicators, α and β All are weighting coefficients; when SI A value ≥0.85 is considered safe, and climbing the pole is permitted. When 0.7≤ SI When the value is less than 0.8, it is considered safe to operate under limited load and time conditions. when SI A reading less than 0.8 indicates danger and climbing the pole is prohibited.

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