500kv single circuit drilling tower in high altitude area
Patent Information
- Application Number
- CN202522078355.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-26
- Publication Date
- 2026-10-09
- Estimated Expiration
- 2035-09-26
AI Technical Summary
然而，现有技术研究与工程实践多集中于低、中海拔地区，针对海拔4000米以上极端环境的500kV单回路钻越塔，其系统性研究尚属空白；随着西藏、青海等高海拔地区经济社会快速发展，能源需求呈现刚性增长，清洁能源基地的大规模开发以及雅江工程外送需求日益迫切，未来西藏地区高电压等级输电线路建设将显著增加，亟需开展针对该地区500kV单回路钻越塔的专项技术攻关；但是高海拔地区特有的空气稀薄、强紫外线、剧烈温差、频繁冰风复合荷载等严苛环境条件，对铁塔的电气绝缘性能、机械承载能力及材料结构稳定性提出了极大挑战
1、实现技术突破与创新：成功攻克了高海拔地区低气压、强紫外线、剧烈温差等极端环境下的外绝缘配置、荷载精确计算和材料结构稳定性等一系列关键技术难题。
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Figure CN224834542U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of power engineering technology, specifically to a 500kV single-circuit drilling tower for high-altitude areas. Background Technology
[0002] In the field of ultra-high voltage power transmission technology in China, 500kV lines, as the backbone network, have a mature design and construction system. However, existing technical research and engineering practice are mostly concentrated in low and medium altitude areas, and systematic research on 500kV single-circuit drilling towers for extreme environments above 4000 meters is still lacking. With the rapid economic and social development of high-altitude areas such as Tibet and Qinghai, energy demand is showing rigid growth. The large-scale development of clean energy bases and the demand for power transmission from the Yarlung Tsangpo River project are becoming increasingly urgent. In the future, the construction of high-voltage transmission lines in Tibet will increase significantly, necessitating specialized technical research on 500kV single-circuit drilling towers for this region. However, the harsh environmental conditions unique to high-altitude areas, such as thin air, strong ultraviolet radiation, drastic temperature differences, and frequent combined ice and wind loads, pose significant challenges to the electrical insulation performance, mechanical load-bearing capacity, and material structural stability of the towers. Therefore, we propose a 500kV single-circuit drilling tower for high-altitude areas. Utility Model Content
[0003] To address the problems in the existing technology, this utility model provides a 500kV single-circuit drilling tower for high-altitude areas.
[0004] The technical solution adopted by this utility model to solve its technical problem is a 500kV single-circuit drilling tower for high-altitude areas, including tower legs. A transverse partition is mounted on the top surface of the tower legs, and lower curved arms are provided on both sides of the top surface of the transverse partition. An upper curved arm is mounted on the end of the lower curved arm away from the transverse partition, and a conductor crossbar for support is mounted between the two sets of upper curved arms.
[0005] Specifically, the outer end surface of the conductor cross section is provided with conductor hanging points, and there are multiple sets of conductor hanging points.
[0006] Specifically, a ground wire bracket is fitted on the top surface of the upper curved arm, and a ground wire hanging point is provided at the end of the ground wire bracket away from the upper curved arm.
[0007] Specifically, the ground wire bracket, conductor crossbar, and upper curved arm have a goblet-shaped structure.
[0008] Compared with the prior art, the present invention has the following beneficial effects: 1. Achieve technological breakthroughs and innovations: Successfully overcome a series of key technical challenges in extreme environments such as low air pressure, strong ultraviolet radiation, and drastic temperature differences in high-altitude areas, including external insulation configuration, accurate load calculation, and material structure stability.
[0009] 2. Significant economic benefits: By optimizing the tower type and sag design, a compact layout is achieved to ensure safe tunneling, avoiding long-distance detours of transmission lines, saving valuable transmission corridor resources, reducing land acquisition costs and total project investment, and minimizing the impact on the surrounding ecological environment.
[0010] 3. Facilitating Coordinated Regional Development: It can strengthen the main grid structure of the Tibet power grid, improve power supply reliability and mutual assistance capabilities, meet the energy needs of regional economic and social development, and inject continuous momentum into the sustainable development of the border region. In summary, this drilling and tower crossing project not only breaks through the key technical bottlenecks in high-altitude power transmission projects, but also has significant economic benefits and far-reaching strategic significance. It is an important innovation that promotes technological progress in the industry and coordinated regional development. Attached Figure Description
[0011] The present invention will be further described below with reference to the accompanying drawings and embodiments.
[0012] Figure 1 This is an isometric view of the present invention; Figure 2 This is a schematic diagram of the overall structure of this utility model at point A. Figure 3 This is a schematic diagram of the overall structure of this utility model at point B. In the diagram: 1. Ground wire hanging point; 2. Ground wire bracket; 3. Conductor crossbeam; 4. Conductor hanging point; 5. Upper curved arm; 6. Lower curved arm; 7. Crossbeam; 8. Tower leg. Detailed Implementation
[0013] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.
[0014] Please see Figure 1-3 This utility model provides a technical solution: a 500kV single-circuit drilling tower for high-altitude areas, including tower legs 8, a transverse partition 7 is mounted on the top surface of the tower legs 8, and a lower curved arm 6 is provided on both sides of the top surface of the transverse partition 7. An upper curved arm 5 is mounted on the end of the lower curved arm 6 away from the transverse partition 7, and a conductor crossbar 3 for support is mounted between the two sets of upper curved arms 5. The outer end surface of the conductor cross section 3 is provided with conductor hanging points 4, and there are multiple sets of conductor hanging points 4; The top surface of the upper curved arm 5 is fitted with a ground wire bracket 2, and a ground wire hanging point 1 is provided at the end of the ground wire bracket 2 away from the upper curved arm 5; The grounding bracket 2, the conductor crossbar 3, and the upper curved arm 5 are in the shape of a wine glass.
[0015] The working principle of this utility model: Basic design requirements: The design basic wind speed is 30 m / s, with 10 mm of icing; the design altitude is considered to be 4000-5000m; the conductor uses 4×JL3 / G1A-500 / 45 steel core high conductivity aluminum stranded wire, 4 wires per phase, with a safety factor of 2.5; the ground wire is aluminum-clad steel stranded wire JLB20-150, with a ground wire safety factor of 4. Electrical design aspects: The insulation configuration is based on Class C pollution area, the creepage distance is uniformly taken as 39mm / kV, the jumper string structure height is considered as 8200mm, the lightning overvoltage gap is taken as 4.7m, the switching overvoltage gap is taken as 4.55m, the power frequency voltage gap is taken as 2.2m, and the live maintenance gap is taken as 5.1m. Based on the above basic conditions, the wind deflection angle is calculated and the gap circle is drawn. The tower head adopts a goblet-shaped tension tower structure. Operating conditions: horizontal span 600m, vertical span 300 / ±900m, angle range 0~60°, elevation range 24~30m; conductor suspension point height is precisely calculated to ensure a safe vertical distance from the drilled-through line under extreme conditions; addressing the frequent lightning strikes in high-altitude areas, the ground wire arrangement is optimized with a double ground wire layout, reducing the protection angle to -5°; Structural design aspects: The main tower body is constructed of Q420 high-strength steel with hot-dip galvanizing for corrosion protection. The structural design, taking into account the high altitude and seismic intensity of Tibet, employs a square tower cross-section. To ensure the tower's torsional stiffness, all tower body surfaces are rigid. The angle between the tower's diagonal members and the horizontal plane is controlled within the range of 30–45 degrees. The angles between the main members of the upper and lower curved arms and the main members of the conductor crossarms are not less than 18 degrees. The angles between the main diagonal members of the tower legs are not less than 20 degrees, and the angles between the diagonal members of the tower legs and the horizontal plane are not less than 30 degrees, ensuring overall structural rigidity. The auxiliary members of the tower legs are arranged in a reasonable manner to enhance their support for the main and diagonal members. The stiffness of the diagonal members of the tower legs matches that of the main members. The conductor crossarms and ground wire supports are all designed with a square cross-section. The design incorporates various structural elements, including the ground wire support and the bottle neck diaphragm, taking into account the characteristics of high seismic intensity. During the detailed design phase, structural optimizations are implemented for special locations such as conductor / ground wire hanging points, upper and lower curved arm connections, and the bottle neck diaphragm. To reduce the tower base footprint, the tower legs feature a small root opening design. Holes for the support ropes are pre-drilled on the main tower structure, serving as support points during lifting and hoisting. Construction holes are provided on the tower foot plates for temporary fixing of guy wires and guide pulleys; these holes are present on both the inner and outer sides of the foot plates to facilitate tower construction in oxygen-deficient environments in high-altitude regions. The slenderness ratio of components is strictly controlled and must meet the requirements of the "Technical Specification for Structural Design of Overhead Transmission Line Towers" (DL / T). According to Article 5.2.2 of 5486-2020, the slenderness ratio of the newly designed iron tower should not exceed 350; calculations should be performed on the double angle steel for hanging lines and the short angle steel and hanging point bolts for hanging lines, taking into account the load characteristics of high-altitude areas; to facilitate the transportation and installation of angle steel in high-altitude areas, the length and weight of a single angle steel should be strictly controlled, and in principle, the length should not exceed 12 meters and the weight should be controlled within 1.5 tons; angle steel with a leg width of 100mm or less should not exceed 9 meters in principle.
[0016] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The descriptions of the above embodiments and specifications are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of protection claimed by this utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.
Claims
1. A 500kV single-circuit drilling tower for high-altitude areas, characterized in that, The tower includes a tower leg (8), the top surface of which is fitted with a transverse partition (7), and both sides of the top surface of the transverse partition (7) are provided with a lower curved arm (6). The end of the lower curved arm (6) away from the transverse partition (7) is fitted with an upper curved arm (5), and a conductor crossbar (3) for support is fitted between the two sets of upper curved arms (5).
2. The 500kV single-circuit drilling tower for high-altitude areas according to claim 1, characterized in that, The outer end surface of the conductor cross section (3) is provided with conductor hanging points (4), and there are multiple sets of conductor hanging points (4).
3. A 500kV single-circuit drilling tower for high-altitude areas according to claim 1, characterized in that, The top surface of the upper curved arm (5) is equipped with a ground wire bracket (2), and a ground wire hanging point (1) is provided at the end of the ground wire bracket (2) away from the upper curved arm (5).
4. A 500kV single-circuit drilling tower for high-altitude areas according to claim 3, characterized in that, The grounding bracket (2), conductor crossbar (3) and upper curved arm (5) are in the shape of a wine glass.