Angle steel power tower
Angle steel power tower is a steel structure tower made mainly of angle steel as the main raw material. It is an indispensable and important component of power transmission and distribution systems, mainly used for setting up high-voltage transmission lines and undertaking the key task of supporting high-voltage transmission cables.
Its structure is mainly composed of angle steel, connecting steel plates, and bolts. Each member is often made of single equilateral angle steel or composite angle steel, and connected by rough bolts subjected to shear force. The overall structure can be divided into three main parts: tower head, tower body, and tower legs. Among them, if there is a sharp change in the cross-section of the tower from the tower leg upwards (with a broken line), the part above the broken line is the tower head; If there is no sharp change in cross-section, the part above the lower chord of the lower cross arm is the tower head. The first section of the tower on top of the foundation is the tower legs, and the part between the tower legs and the tower head is the tower body. For iron towers with a height of less than 60m, foot nails are usually installed on one of the main materials to facilitate construction workers to climb the tower.
• Classified by purpose: there are tension towers, straight towers, corner towers, transposition towers, terminal towers, and crossing towers. Tension towers are mainly used to limit the range of line breakage or tower collapse accidents; Linear towers are used to support transmission lines in straight sections; Corner towers are used in places where the direction of the line needs to be changed; Transposition tower is used to change the phase position of the wire; The terminal tower is located at the end of the transmission line; Crossing towers are used to cross obstacles such as rivers and valleys.
• Classified by shape: Common types include glass shaped, cat head shaped, top shaped, dry shaped, and V-shaped. Different shape designs are suitable for different terrains, transmission needs, and environmental conditions.
• Advantages：
◦ High strength and good stability: Angle steel itself has high strength. Through reasonable structural design and connection methods, angle steel power towers can withstand large loads, including the weight of wires, wind loads, ice loads, and personnel loads during installation or maintenance, ensuring the safe and stable operation of transmission lines.
◦ Convenient processing and production: The processing technology of angle steel is relatively mature, easy to cut, drill, weld and other processing operations, which can quickly produce components that meet design requirements and improve production efficiency.
◦ Easy to assemble and maintain: Using bolt connections, it is convenient and fast to assemble on the construction site, which can shorten the construction period. During later maintenance, if a component has a problem, it is also easy to disassemble and replace.
◦ Relatively moderate cost: Compared to some power towers made of special materials, angle steel prices are relatively stable and low, which can effectively control construction costs while ensuring performance.
• Disadvantages: Due to the exposed steel structure commonly used in angle steel power towers, angle steel is prone to corrosion in long-term natural environments, especially in highly corrosive environments such as humidity, acidity, and alkalinity, which affects its service life and structural strength. Regular anti-corrosion maintenance is required.
Widely used in various power transmission scenarios, whether it is large-scale power grid construction in plain areas or transmission line laying in complex terrain conditions such as mountains and hills, angle steel power towers can play an important role. It is very common in scenarios such as connecting substations and transmission lines around cities, and building long-distance transmission lines in remote areas.
• Material: Generally, Q235 (A3F) and Q345 (16Mn) steels are used, which have good mechanical properties and can meet the strength and stability requirements of angle steel power towers.
• Wind speed resistance: It can usually reach 30m/s or above, and the specific value depends on different design standards and usage environments to ensure safe operation even in strong wind weather.
• Anti icing: It can generally withstand an icing thickness of about 8mm, ensuring that the power tower can still support the transmission line normally in cold areas when there is icing.
• Seismic intensity: can reach around 8 degrees, with a certain degree of seismic resistance, reducing the damage of natural disasters such as earthquakes to transmission lines.
• Height dimension: The common height range is between 10m and 60m, and it should be designed reasonably based on factors such as voltage level and crossing distance of the transmission line.
• Service life: Under normal circumstances, it can reach 50 years, and with proper anti-corrosion and maintenance measures, it can provide long-term stable service for power transmission.
With the continuous development of intelligent and high-capacity power grid construction, as well as the increasing environmental requirements, angle steel power towers are also constantly developing and innovating. On the one hand, in terms of material application, we will explore the use of steel with higher strength and better corrosion resistance to further improve the performance and service life of angle steel power towers; On the other hand, in terms of structural design, more emphasis will be placed on optimization to make it lighter and more compact, in order to adapt to different terrains and construction conditions. At the same time, in the production and construction process, more attention will be paid to environmental protection and efficiency, advanced processing technology and construction techniques will be adopted to reduce the impact on the environment and improve construction efficiency.
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