L68A1 Mast Section Tower hanging tower structure rotation mode
The tower structure rotation method of the tower crane can be divided into lower rotation(tower body rotation) and upper rotation(tower body does not rotate) tower crane.
The lower rotary tower crane sets the rotary support and the balance weight main mechanism at the lower end. Its advantages are: less bending moment, low center of gravity, good stability, and convenient installation and maintenance. The disadvantage is that the requirements for rotary support are high and the installation height is limited.
The upper rotary tower crane sets up the main mechanism of rotary support and balancing weight at the upper end. Its advantage is that because the tower body does not rotate, it can simplify the structure of the lower part of the tower body and make it easier to rise and add knots. The disadvantage is that when the building exceeds the height of the tower, due to the influence of the balance arm, the swing of the tower crane is limited. At the same time, the center of gravity is large, the wind pressure is increased, and the pressure weight is increased, so that the overall total weight is increased.
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