Ultra-high voltage overhead transmission line crossing construction safety guarantee device and method

Abstract

The invention relates to the field of electric power engineering construction, in particular to an ultrahigh-voltage overhead transmission line crossing construction safety guarantee device and method. Comprising standard modularized wooden scaffold units, a high-strength protective net and quick connecting devices. Each wooden scaffold unit comprises a triangular supporting structure composed of main stand columns subjected to anti-corrosion treatment, horizontal cross rods with the interval of 1.5 m and inclined struts, and concrete foundation cushion blocks are arranged at the bottoms of the wooden scaffold units and fixed through expansion bolts. The protective net is of a double-layer crossed grid structure woven by polyethylene fibers and comprises basic grids and oblique crossed reinforcing lines. The quick connecting device is connected with the protective net and the wooden scaffold unit and comprises a U-shaped clamp and a stainless steel ribbon. A safe, reliable, economical and convenient solution is formed, and important reference is provided for similar engineering construction.

Description

Technical Field

[0001] The present invention relates to the field of electric power engineering construction, and in particular to a safety assurance device and method for crossover construction of ultra-high voltage overhead transmission lines. Background Art

[0002] In modern power engineering construction, the problem of crossing overhead transmission lines is becoming increasingly prominent. With the acceleration of urbanization and the expansion of power grids, the crisscrossing of transmission lines of varying voltage levels is becoming increasingly common. Especially during the construction of long-distance transmission projects, the removal of high-voltage cables presents severe safety challenges. Traditional construction methods often rely on simple insulation shielding measures or manual monitoring, which have numerous shortcomings: first, insulation shielding materials are prone to displacement or damage under high loads and wind loads; second, manual monitoring is inefficient and cannot completely prevent accidents; and third, existing protective measures are mostly temporary solutions that lack systematicity and reusability.

[0003] With the rapid development of power infrastructure, the problem of overhead transmission line crossings is becoming increasingly common. During the construction of long-distance transmission projects, especially when removing high-voltage cables, improper control can cause high-voltage lines to fall onto operating low-voltage lines below, causing damage to the low-voltage lines, atmospheric overvoltage, and flashover incidents. These problems can not only lead to severe economic losses, but also threaten personal safety and the stable operation of the power grid.

[0004] At present, traditional solutions mainly include using insulating shielding materials or arranging special personnel for supervision, but these methods generally have the following shortcomings: Insufficient safety: Insulation shielding materials are prone to displacement or damage under high load and wind load conditions; Inefficiency: Manual monitoring is time-consuming and labor-intensive and cannot completely eliminate accidents; Lack of systematicness: Existing protective measures are mostly temporary solutions that lack scientificity and reusability.

[0005] Therefore, there is an urgent need for a safe, reliable, economical and convenient solution to address the safety challenges in the construction of crossing overhead transmission lines. Summary of the Invention

[0006] In order to solve the above problems, the present invention provides a safety assurance device and method for crossing construction of ultra-high voltage overhead transmission lines.

[0007] The present invention adopts the following technical solution: a safety guarantee device for crossing and spanning construction of ultra-high voltage overhead transmission lines, comprising: Standard modular wooden scaffolding units, high-strength protective nets and quick-connect devices; The wooden scaffolding unit includes a triangular support structure consisting of anti-corrosion treated main columns, horizontal crossbars with a spacing of 1.5 meters, and diagonal braces. A concrete foundation pad is set at the bottom and fixed with expansion bolts; The protective net is woven from polyethylene fibers into a double-layer cross-grid structure, including a basic grid and oblique cross reinforcement lines; The quick connection device connects the protective net and the wooden scaffolding unit, and the quick connection device includes: a U-shaped clamp and a stainless steel cable tie.

[0008] In some embodiments, the main columns are made of red pine wood with a density of 0.5g / cm³ and a bending strength of 65MPa. The maximum height of the scaffolding unit is ≤12 meters, the distance between adjacent units is 8-12 meters, and the load bearing capacity is ≥500kg / m².

[0009] In some embodiments, the edge of the protective net is provided with a 5 cm thickened edging, the tensile strength of a single fiber is ≥10 kN, and the impact resistance of the mesh structure is 1.8 times that of a single-layer structure.

[0010] In some embodiments, the inner side of the U-shaped clamp is provided with a diamond-shaped anti-slip pattern with a friction coefficient of 0.7, the stainless steel cable tie has a weather resistance life of ≥10 years after salt spray testing, and the tensioning device is equipped with a self-locking manual winch.

[0011] In some embodiments, the connection nodes between the diagonal braces and the horizontal bars adopt a mortise and tenon structure to enhance stability, and the size of the concrete foundation pad is 50 cm×50 cm×20 cm.

[0012] A construction method for a safety assurance device for crossing construction of an ultra-high voltage overhead transmission line, comprising: S1. On-site measurement: Determine the location and height of the low-voltage line to be protected; S2. Scaffolding: Install wooden floor-mounted scaffolding on both sides of the crossing point. The scaffolding height should be at least 2 meters higher than the low-voltage line, and the spacing between adjacent scaffolding should be 8-12 meters. S3. Install the protective net: Drape the net between the scaffolding and secure the edges of the net to the horizontal crossbars of the scaffolding using U-shaped clamps and stainless steel cable ties. S4. Tensioning the net: Operate the manual winch to gradually tension the net to the desired tension via the guide pulley. S5. Construction: Dismantle or install lines under the protection of a tightened protective net; S6. Dismantling equipment: After construction is completed, release the tensioning device, untie the connectors, and dismantle the protective net and scaffolding in turn.

[0013] In step S2, when the required protection height exceeds 12 meters, a scaffold is constructed by stacking and combining multiple scaffold units.

[0014] Compared with the prior art, the present invention has the following beneficial effects: First, the use of wood scaffolding ensures sufficient strength while avoiding the electromagnetic interference associated with metal. Second, the design of the protective netting takes into account mechanical properties, electrical insulation characteristics, and ease of construction, resulting in a unique weaving method and structural parameters. Third, modern engineering methods such as finite element analysis are used to evaluate the load-bearing capacity and stability of the entire system, ensuring its reliability under various operating conditions. These innovations together form a safe, reliable, economical, and convenient solution, providing an important reference for similar construction projects. DETAILED DESCRIPTION

[0015] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are part of the embodiments of the present invention, not all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0016] (1) Structural design of wooden ground scaffolding The wooden floor-standing scaffolding in the present invention adopts a standard modular design, and a single scaffolding unit consists of three parts: main columns, horizontal crossbars and diagonal braces. The main columns are made of high-quality red pine wood with specifications of 100mm×100mm×3000mm. The surface is treated with anti-corrosion to ensure its durability in outdoor environments. The spacing between horizontal crossbars is set to 1.5 meters, and each layer of crossbars is equipped with reinforced diagonal braces to form a stable triangular support structure. In order to enhance the overall stability, a 20cm thick concrete foundation pad is set at the bottom of the scaffolding and fixed to the ground with expansion bolts to prevent overturning due to wind loads or external forces.

[0017] The scaffolding height is designed based on the actual height requirements of the crossing point, typically at least 2 meters above the low-voltage line to ensure adequate safety distance. Furthermore, considering operator convenience and material transportation efficiency, the maximum height of a single scaffolding unit is limited to 12 meters. Heights exceeding this limit require the use of multiple units. The spacing between adjacent scaffolds is determined by the tension characteristics of the protective netting, generally maintaining a range of 8-12 meters to ensure the flatness and uniformity of the netting.

[0018] (2) Protective net design and material selection The protective net is a key component of this invention, designed with safety, cost-effectiveness, and ease of construction in mind. The net is constructed from high-strength polyethylene fiber, a material with excellent tensile strength (up to 1.5 times that of ordinary steel wire rope), lightweight, and excellent electrical insulation. The fiber diameter is set at 4mm, meeting strength requirements while reducing material costs.

[0019] The protective netting utilizes a unique "double-layer cross-grid" structure, adding a layer of diagonal cross-grid reinforcement to the basic grid, creating a multi-layered protective barrier. The basic grid aperture is set at 200mm x 200mm, with the diagonal cross-grid spacing of 150mm. This design ensures sufficient coverage while also allowing for adequate ventilation and light transmission. To enhance the overall stability of the netting, a 5cm thick edging is added to the edges for easier tensioning and securing.

[0020] (3) Connection method between scaffolding and protective net The scaffolding and protective netting are connected using a combination of specialized U-shaped clamps and stainless steel cable ties. Made of high-strength plastic and featuring anti-slip ribs on the inside, the U-shaped clamps securely fasten the protective netting to the scaffolding's horizontal crossbars. Two stainless steel cable ties are used at each connection point for dual securing, ensuring a secure connection. For easy installation and removal, the clamps feature a quick-release mechanism, requiring only simple tools.

[0021] Controlling the tension of the protective net is crucial to ensuring its effectiveness. An adjustable tensioning device installed at the top of the scaffolding allows precise adjustment of the net's tension. The tensioning device consists of a manual winch and a guide pulley. Operators rotate the winch to gradually tighten the net until the desired tension is reached. This design not only improves construction efficiency but also effectively prevents material damage caused by over-tensioning.

[0022] The entire safety system utilizes a modular design concept, allowing for flexible layout adjustments based on site conditions. For complex crossing scenarios, the system can be adapted to varying working conditions by increasing the number of scaffolding units and adjusting the coverage of the protective net. Furthermore, the system design considers the impact of various environmental factors, such as wind loads and temperature fluctuations, and optimizes structural parameters to ensure stability and reliability under various conditions.

[0023] Key parameters of wooden floor scaffolding: The design of the wooden ground-based scaffolding fully embodies the balance between practicality and economy. The red pine wood used for the main columns has a density of 0.5g / cm³ and a bending strength of 65MPa, capable of withstanding a maximum load of 500kg / m². The spacing of the horizontal crossbars is 1.5 meters, which is the optimal value verified by multiple tests. It can ensure structural stability without increasing material costs too much. The concrete foundation pad at the bottom of the scaffolding is 20cm thick and has an area of 50cm×50cm, which can effectively disperse the load and provide a solid foundation support. The spacing between scaffolds is set in the range of 8-12 meters. This is the optimal range based on the material properties of the protective net and actual construction experience. It can ensure the flatness of the protective net and reduce material consumption.

[0024] Protective net material and structure: The high-strength polyethylene fiber used in the protective netting offers unique advantages: a breaking strength of 3.5 GPa and an elongation of only 3%-4%, far superior to traditional nylon or polyester materials. The 4mm fiber diameter was carefully selected to ensure sufficient tensile strength (a single fiber can withstand a tensile force of 10 kN) while maintaining appropriate flexibility for ease of construction. The innovative "double-layer cross-grid" structure significantly enhances the netting's load-bearing capacity. Theoretical calculations show that this structure can increase the impact resistance of a single-layer grid by 1.8 times. Of particular note, the 150mm spacing between the diagonal cross lines, verified by finite element simulation analysis, ensures effective protection while minimizing material usage.

[0025] Connection method: The connection method between the scaffolding and the protective net adopts a number of innovative technologies. The anti-slip texture on the inside of the U-shaped clamp adopts a diamond geometric pattern, with a friction coefficient of up to 0.7, which effectively prevents the protective net from sliding during use. The selection of stainless steel cable ties takes into account weather resistance and corrosion resistance. After salt spray testing, it has been proven that it can be used in outdoor environments for more than 10 years. The design of the quick release mechanism is inspired by the quick release device in the aviation field. The clamp can be opened or closed through a simple lever mechanism, which greatly improves construction efficiency. The manual winch of the tensioning device adopts a self-locking design. After adjusting to the required tension, it can remain stable without the need for additional fixings. This design significantly reduces the difficulty and labor intensity of construction.

[0026] The optimized design of the entire system demonstrates significant economic benefits. For example, the scaffolding height is limited to 12 meters, simplifying the construction process and reducing the risks of working at height. While the protective net's "double-layer cross-grid" structure increases material costs, its significantly increased load-bearing capacity and service life improve overall economic efficiency. It is estimated that compared to traditional protective measures, this invention can save approximately 30% in material costs while increasing construction efficiency by over 40%. Furthermore, all components are reusable, further reducing the project's long-term operating costs.

[0027] This invention is applicable to various overhead transmission line crossing construction scenarios, and particularly demonstrates significant advantages in high-voltage line removal operations in complex power grid environments. The following is a detailed explanation from different application perspectives: During the removal of high-voltage power lines, the safety device provided by this invention effectively prevents the dismantled lines from accidentally falling onto the operating low-voltage lines below. The insulating properties of the wooden scaffolding ensure electrical safety during construction, while the high-strength protective netting provides a reliable physical barrier to any potential power line fall. The device is particularly noteworthy for its exceptional performance in emergency situations: even in strong winds, the netting remains stable, preventing safety hazards caused by external factors.

[0028] This invention also plays a significant role when new high-voltage lines need to cross existing low-voltage lines. By pre-installing protective devices, the new line can be installed without affecting the normal operation of the existing line. This approach not only improves construction efficiency but also significantly reduces the economic losses caused by power outages. According to statistics, in actual applications, the use of this invention can save an average of approximately 6 hours of power outage time per crossing construction, resulting in significant economic benefits.

[0029] This invention also demonstrates its unique value in routine maintenance and emergency repairs of power lines. Due to its modular design and quick assembly and disassembly capabilities, the protective device can be installed and removed in a short time, saving valuable time for emergency repairs. Furthermore, its reusability makes it ideal for frequent line maintenance work, effectively reducing construction costs.

[0030] This invention demonstrates excellent adaptability in complex terrain conditions, such as mountains and hills. The wooden scaffolding can be flexibly adjusted in height and spacing to suit the undulating terrain, while the elastic design of the protective netting adapts to irregular support structures. This flexibility enables the device to handle construction tasks in a variety of complex environments, ensuring safety and efficiency during the construction process.

[0031] From an economic perspective, this invention significantly reduces construction costs through optimized design. It has been estimated that, in a typical project, the use of this device can save approximately 30% in direct material costs while increasing construction efficiency by over 40%. More importantly, the safety benefits it brings are invaluable: it effectively prevents potential line damage accidents, avoids the resulting atmospheric overvoltage and flashover incidents, and ensures the safe and stable operation of the power grid. This comprehensive benefit makes this invention highly valuable for widespread application in the field of power construction.

[0032] To comprehensively evaluate the safety and mechanical properties of this invention, we conducted in-depth research using a series of advanced analytical methods and specialized software. First, we used ANSYS finite element analysis software to conduct a detailed simulation of the structural strength of a wooden ground-based scaffold. During the modeling process, we considered the scaffold as a three-dimensional spatial frame structure, accounting for stress concentration effects at the joints and the nonlinear properties of the wood material. Calculations of the scaffold's deformation, stress distribution, and stability under various operating conditions demonstrated that, under maximum design loads (including wind loads, construction loads, and impact loads), the stresses in the scaffold's main components were all below 80% of the allowable stress, demonstrating a sufficient safety margin. The maximum relative displacement at the joints was less than 2 mm, indicating good structural stability.

[0033] The mechanical properties of the protective net were analyzed using dynamic simulation software ABAQUS. The model accounted for the net's complex geometry and nonlinear material behavior, with particular attention paid to the response characteristics of the double-layer cross-grid structure under impact loads. By simulating the impact of objects of varying sizes, speeds, and masses on the net, detailed stress-strain curves and energy absorption characteristics were obtained. The results showed that the net can effectively absorb impact energy equivalent to more than 500 times its own weight and maintain its original geometry and mechanical properties after multiple impacts.

[0034] We also developed a specialized optimization algorithm using MATLAB software to automatically adjust scaffolding spacing and net tension parameters to achieve optimal mechanical performance. This algorithm, combining genetic algorithms and particle swarm optimization techniques, finds the optimal solution in a short period of time. Comparative analysis shows that the optimized system, while using the same material content, increases load-bearing capacity by approximately 20%, while increasing construction costs by less than 5%.

[0035] A construction method for a safety assurance device for crossing construction of an ultra-high voltage overhead transmission line, comprising: S1. On-site measurement: Determine the location and height of the low-voltage line to be protected; S2. Scaffolding: Install wooden floor-mounted scaffolding on both sides of the crossing point. The scaffolding height should be at least 2 meters higher than the low-voltage line, and the spacing between adjacent scaffolding should be 8-12 meters. S3. Install the protective net: Drape the net between the scaffolding and secure the edges of the net to the horizontal crossbars of the scaffolding using U-shaped clamps and stainless steel cable ties. S4. Tensioning the net: Operate the manual winch to gradually tension the net to the desired tension via the guide pulley. S5. Construction: Dismantle or install lines under the protection of a tightened protective net; S6. Dismantling equipment: After construction is completed, release the tensioning device, untie the connectors, and dismantle the protective net and scaffolding in turn.

[0036] In step S2, when the required protection height exceeds 12 meters, a scaffold is constructed by stacking and combining multiple scaffold units.

[0037] Example 1 A long-distance power transmission project requires the removal of a 220kV high-voltage line. A 10kV low-voltage line is currently operating below the line. To ensure construction safety, the present invention's safeguard device and method are employed. The specific implementation steps are as follows: Scaffolding construction: Based on on-site measurement data, two sets of wooden floor-standing scaffolding were constructed, each set with a height of 15 meters (including two single scaffolding units stacked together) and a spacing of 10 meters.

[0038] Install the protective net: Use a protective net woven from high-strength polyethylene fibers, cover it between the two sets of scaffolding, and secure it with U-shaped clamps and stainless steel cable ties.

[0039] Adjust the tension: Use a manual winch to gradually tighten the protective net until the designed tension value is reached.

[0040] Construction operation: Dismantle the high-voltage line under the protection of the protective net to ensure that the high-voltage line will not fall onto the low-voltage line.

[0041] Dismantling equipment: After construction is completed, remove the protective net and scaffolding in the reverse order.

[0042] Implementation Effect During this construction process, the protective net successfully prevented the accidental fall of high-voltage lines, avoiding damage to low-voltage lines and related safety accidents. The entire construction process was safe and efficient, verifying the effectiveness and reliability of the invention.

[0043] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A safety device for ultra-high voltage overhead transmission line crossing construction, characterized in that: include: Standard modular wooden scaffolding units, high-strength protective nets and quick-connect devices; The wooden scaffolding unit includes a triangular support structure consisting of anti-corrosion treated main columns, horizontal crossbars with a spacing of 1.5 meters, and diagonal braces. A concrete foundation pad is set at the bottom and fixed with expansion bolts; The protective net is woven from polyethylene fibers into a double-layer cross-grid structure, including a basic grid and oblique cross reinforcement lines; The quick connection device connects the protective net and the wooden scaffolding unit, and the quick connection device includes: a U-shaped clamp and a stainless steel cable tie.

2. The ultra-high voltage overhead transmission line crossing construction safety guarantee device according to claim 1, characterized in that: The main columns are made of red pine wood with a density of 0.5g / cm³ and a bending strength of 65MPa. The maximum height of the scaffolding unit is ≤12 meters, the distance between adjacent units is 8-12 meters, and the load-bearing capacity is ≥500kg / m².

3. The ultra-high voltage overhead transmission line crossing construction safety guarantee device according to claim 1, characterized in that: The edge of the protective net is provided with 5cm thickened edging, the tensile strength of a single fiber is ≥10kN, and the impact resistance of the grid structure is 1.8 times that of a single-layer structure.

4. The ultra-high voltage overhead transmission line crossing construction safety guarantee device according to claim 1, characterized in that: The inner side of the U-shaped clamp is provided with a diamond-shaped anti-slip pattern with a friction coefficient of 0.

7. The stainless steel cable tie has a weather resistance life of ≥10 years after salt spray testing, and the tensioning device is equipped with a self-locking manual winch.

5. According to the safety assurance device for crossing construction of ultra-high voltage overhead transmission lines in claim 1, the connection nodes between the diagonal braces and the cross bars adopt a mortise and tenon structure to enhance stability, and the size of the concrete foundation pad is 50cm×50cm×20cm.

6. A construction method for the ultra-high voltage overhead transmission line crossing construction safety guarantee device according to any one of claims 1 to 5, characterized in that: include: S1. On-site measurement: Determine the location and height of the low-voltage line to be protected; S2. Scaffolding: Install wooden floor-mounted scaffolding on both sides of the crossing point. The scaffolding height should be at least 2 meters higher than the low-voltage line, and the spacing between adjacent scaffolding should be 8-12 meters. S3. Install the protective net: Drape the net between the scaffolding and secure the edges of the net to the horizontal crossbars of the scaffolding using U-shaped clamps and stainless steel cable ties. S4. Tensioning the net: Operate the manual winch to gradually tension the net to the desired tension via the guide pulley. S5. Construction: Dismantle or install lines under the protection of a tightened protective net; S6. Dismantling equipment: After construction is completed, release the tensioning device, untie the connectors, and dismantle the protective net and scaffolding in turn.

7. The construction method of the ultra-high voltage overhead transmission line crossing construction safety guarantee device according to claim 6, characterized in that: In step S2, when the required protection height exceeds 12 meters, a scaffold is constructed by stacking and combining multiple scaffold units.