Tie a porcelain bottle with iron wire on the standard section, and tie the cable to the porcelain bottle with 1.5 or 2.5 insulated wire, tie one every 15 to 20 meters, untie it when jacking, and tie it again after jacking. This prevents the cable from swinging due to the wind and also reduces the weight of the cable.
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Mobile tower cranes can be divided into four types according to different walking devices: crawler, tire, automobile and crawler. The tower of the track tower crane is fixed on the walking underframe, which can run on the specially designed track, with good stability, high working efficiency, and is widely used in construction and installation projects. Tyre-type, automobile-type and crawler-type tower cranes have no track device, so they are easy to move, but they can't walk with load and have poor stability.
According to the different installation positions, fixed tower cranes can be divided into two types: attached jacking type and internal climbing type. Attached jack-up tower crane can rise with the rise of buildings, which is suitable for high-rise buildings.
The building structure only bears the horizontal load from the tower crane, which is convenient to attach, but it takes up more steel for the structure; The internal climbing tower crane climbs inside the building (elevator shaft and stairwell) with a set of supports and lifting system, which is cumbersome, but it takes up less structural steel and does not need to install the foundation. All the weight and load are borne by the building.
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