Angle steel transmission tower
In the 1980s, many countries in the world began to apply steel pipe profiles to the structure of iron towers when developing UHV transmission lines. Steel pipe towers with steel pipes as the main material of the towers appeared.
In Japan, almost all of the 1000kV ultra-high voltage lines and towers use steel tube towers, and their research on the design of steel rods is very thorough. Drawing on foreign experience, domestic steel pipe profiles have also been used in the 5OOkV double-circuit iron tower and the same tower four-circuit tower, which shows its good performance and benefits.
The advantages are as follows: First, the wind pressure of the tower body can be reduced (the shape coefficient of the member is almost double that of the angle steel); secondly, when the cross-sectional area is equal, the radius of gyration of the round tube is about 20% larger than that of the angle steel. Third, the structural load-bearing capacity is improved. Generally speaking, the steel pipe tower is reduced by 10%-20% compared with the angle steel tower; at the same time, the number of bars can be reduced, the tower construction period can be shortened, and the structure is diversified. However, the use of steel pipes also has the disadvantages of limited specifications of steel pipe profiles, poor quality outside, and high price. At the same time, the joints between the steel pipes are complicated in structure and low in production efficiency.
Angle steel is widely used in various construction and engineering structures, such as transmission towers, house beams, bridges, lifting and transportation machinery, ships, container racks and warehouse racks. At present, Xuanhua Steel Co., Ltd. has the production capacity of nearly 2,000 specifications of National Standard Angle Steel, State Grid Angle Steel and South Net Angle Steel. The products are mainly sold to Southwest, East China, South China, Shandong, Northeast and other regions. In 2010, Xuanhua Iron and Steel began supplying angle steel to the State Grid Corporation. At the beginning of 2011, Xuanhua Iron and Steel Co., Ltd. signed a 200,000-ton angle steel frame agreement with State Grid Corporation. It is the only manufacturer in China that has signed a framework agreement with it. Today, the State Grid Corporation’s large-size Q345B and Q420B angle steels are all supplied by Xuanhua Steel, accounting for the national grid. The company’s total demand for angle steel is more than 10%. As of the end of June, Xuanhuan produced a total of 77,778 tons of national grid angle steel.
Angle stee(Angle steel transmission tower)l: commonly known as angle iron, is a long strip of steel that is perpendicular to each other on both sides, with equal angle steel and unequal angle steel. The sides of the equiangular steel are equal in width. The specifications are expressed in millimeters of side width × side width × side thickness. For example, “∠30×30×3” means an equilateral angle steel with a side width of 30 mm and a side thickness of 3 mm. It can also be expressed by model number, the model number is the number of centimeters of the side width, such as ∠3#. The model does not indicate the size of the different side thicknesses in the same model. Therefore, the side width and thickness of the angle steel are filled in the contract and other documents, and the model is not to be used alone. The specification of hot rolled equal angle steel is 2#-20#. Angle steel can be composed of various force-receiving members according to the different needs of the structure, and can also be used as a connecting member between the members. Widely used in a variety of building structures and engineering structures, such as beams, bridges, transmission towers, lifting and transport machinery, ships, industrial furnaces, reaction towers, container racks and warehouse shelves.
Angle steel, commonly known as angle iron, is a long strip of steel that is perpendicular to each other on both sides. There are equal angle steel and unequal angle steel. The sides of an equilateral angle are equal in width. The specifications are expressed in millimeters of side width × side width × side thickness. For example, “∟30×30×3” means an equilateral angle steel with a side width of 30 mm and a side thickness of 3 mm. It can also be expressed by model number, the model number is the number of centimeters of the side width, such as ∟3#. The model does not indicate the size of the different side thicknesses in the same model. Therefore, the side width and thickness of the angle steel are filled in the contract and other documents, and the model is not to be used alone. The specification of hot rolled equal angle steel is 2#-20#. Angle steel can be composed of various force-receiving members according to the different needs of the structure, and can also be used as a connecting member between the members. Widely used in a variety of building structures and engineering structures, such as beams, bridges, transmission towers, lifting and transport machinery, ships, industrial furnaces, reaction towers, container racks and warehouses.
angel steel Tower structure
The whole tower is mainly composed of three parts: the tower head, the tower body and the tower leg. If it is a pull tower, it also adds a wire drawing part.
Tower head
The section from the tower leg to the upper tower changes sharply (the fold line appears). The above part is the tower head. If there is no sharp change in the section, the lower part of the lower cross arm is the tower head.
Tower leg
The first section of the tower above the base is called the tower leg.
Tower body
The part between the tower leg and the tower is called the tower body.
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