The top structure of tower crane mainly refers to the structure combination of boom, tower crane cap and balance arm
The tower hanging enterprises produce tower hanging and tower hanging accessories. Various tower hanging models emerge one after another, and the uses are different.
Among them, the important distinguishing standard is the top structure of Tower hanging. The top structure of the tower crane mainly refers to the structure combination of the boom, tower cap and balance arm.
The main top structure of the tower crane can be divided into the following categories:
1, cantilever structure(flat head tower crane)
Stress: The lifting arm and the balancing arm of the flat head tower crane belong to the static structure of the cantilever. The mechanical model is single and the calculation is simple. The internal force is larger under the same load.
Amount of steel structure: because of the cantilever force, it is compared with other structural forms.
Manufacturing: No tower cap, pull rod and other structure manufacturing simple.
Installation and disassembly: low installation height requirements, reduce the requirements for lifting equipment during installation and disassembly, save the cost and time for disassembly, and facilitate aerial disassembly; Suitable for cross operation of cluster towers; It is suitable for situations where there are special requirements for height.
2, fixed tower cap, static external extension structure balance arm, single suspension point static structure boom structure
Force: more complex than the flat head tower hanging, more simple than double hanging points.
Amount of steel structure: materials in Pingtou Province; But it's more than a double hang.
Manufacturing: Fixed tower cap manufacturing complex; The balance arm is simple for the planar structure;
Installation and disassembly: high installation height required; Installation and disassembly are more complex than flat heads.
3, fixed tower cap, static extension structure balance arm, double suspension point one Super static crane structure
Stress: The load of the lifting arm for a super-static structure is more complex than that of a single suspension point.
Use of steel structure: For a super-static structure, the most economical material.
Manufacturing: Fixed tower cap manufacturing complex; The balance arm is simple to make for a planar structure.
4, piece tower cap, static cantilever structure balance arm, single suspension static structure boom structure
Stress: The stress analysis of the flat head tower is more complicated, but it is still a static structure. The lifting arm lever, balancing arm lever and sheet tower cap are added, and the lifting arm and balancing arm force are changed.
Amount of steel structure: static structure than Pingtou provincial materials; But it's more than a double hang.
Manufacturing: the sheet tower cap structure is simpler than the fixed tower cap, and the balance arm is more complex than the fixed balance arm.
Installation and disassembly: high installation height required; Installation and disassembly are more complex than flat heads.
5, piece tower cap, static cantilever structure balance arm, double suspension point one Super static cantilever structure
Stress: The load of the lifting arm for a super-static structure is more complex than that of a single suspension point.
Use of steel structure: the crane is a super-static structure, the most economical material.
Manufacturing: the sheet tower cap structure is simpler than the fixed tower cap, and the balance arm is more complex than the fixed balance arm.
The double suspension structure requires high machining precision of two pull rods.
Installation and disassembly: high installation height required; Installation and disassembly are more complex than flat heads.
