How to correctly choose the power steel rod construction hanging point?

February 05 05:06:41, 2024

It is very important to select the proper lifting point for the construction of power steel poles, because cement rods are widely used in low-voltage lines. Because of its low cost and low steel consumption, power steel rods save raw materials; at the same time, The small footprint and the saving of land area during construction have been widely promoted in 220kV lines in recent years. The construction of electric steel rods has its own shortcomings in comparison with the iron towers. The rods are long and difficult to lift. Steel rods stand up easily to deform or even break. Therefore, it is very important to select the proper lifting point for the lifting of steel pipe rods during construction. Larger lengths of electric steel rods are divided into subsection hoisting and integral hoisting. In the case of sub-lifting, the tie point is located at the top of each section of the steel pipe. Due to the shorter section length, the bending moment of the steel pipe shaft is smaller when lifting, and the bending moment that the steel pipe bar itself can withstand can meet the hoisting requirements. Calculations. After the steel pipe is lifted, it is connected or welded to the assembled section in the air until the base bar is fully completed.
When the steel pipe is lifted as a whole, the steel pipe section and the section are connected or welded on the ground. After the ground connection is completed, use the crane or the pole to lift the entire pole up and the top surface of the foundation and fix it on the foundation. In the course of the overall erection of the steel pipe rod, the shaft is subjected to a large bending moment because of the large length of the shaft. For the purpose of construction safety and protection of the rod body, the hoisting process should be checked before hoisting. (cement fence)

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