L68B1 Mast SectionThe top structure of tower crane mainly refers to the structure combination form of lifting arm, tower cap and balance arm
Each enterprise produces the tower crane and the tower crane fittings, each kind of tower crane model emerges endlessly, the use is different, and among them the important distinguishing standard is the tower crane top structure. The top structure of tower crane mainly refers to the structure combination form of lifting arm, tower cap and balance arm. The main top structure of tower crane can be divided into the following types:
L68B1 Mast Section
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1. Cantilever structure (flat-headed tower crane)
Stress: The lifting arm and balance arm of the flat-headed tower crane belong to the statically determinate cantilever structure, with a single mechanical model and simple calculation. The internal force is greater under the same load.
Steel structure: because of cantilever force, compared with other structural forms cost material.
Manufacturing: no tower cap, pull rod and other structure manufacturing simple.
Installation and disassembly: low height requirement for installation reduces the requirements for lifting equipment during installation and disassembly, saves cost and time for disassembly, and makes it easy to disassemble in the air; Suitable for group tower crossing operation; Suitable for situations with special requirements on height.
2. Fixed tower cap, statically determinate overhanging structure balance arm, statically determinate structure boom structure with single lifting point
Stress: more complex than the flat head tower crane, simpler than the double lifting point.
Consumption of steel structure: less material than flat head; But than double lifting point fee.
Manufacturing: Fixed tower cap manufacturing complex; The balancing arm is simple for planar structure.
Installation and disassembly: High installation height requirement; Installation and removal are more complex than flat heads.
3. Fixed tower cap, statically determinate overhanging structure balance arm, double lifting point statically determinate lifting arm structure
Stress: the crane arm is a statically indeterminate structure, and the stress is more complex than the single lifting point.
Dosage of steel structure: it is a statically indeterminate structure with the least amount of material.
L68B1 Mast Section
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Manufacturing: Fixed tower cap manufacturing complex; The balance arm is simple to manufacture for planar structure.
4. Plate tower cap, statically determinate cantilever structure balance arm, statically determinate structure boom structure with single lifting point
Stress: it is more complicated than the analysis of the stress of the flat-headed tower crane, but it is still a statically determinate structure. The stress of the lifting arm and the balancing arm is changed by adding the lifting arm pull rod, the balancing arm pull rod and the chip tower cap.
Dosage of steel structure: Statically determinate structure is less material than flat head; But than double lifting point fee.
Manufacturing: The structure of the plate tower cap is simpler than that of the fixed tower cap, and the balancing arm is more complex than that of the fixed tower cap.
Installation and disassembly: High installation height requirement; Installation and removal are more complex than flat heads.
5. Plate tower cap, statically determinate cantilever structure balance arm, double lifting point once statically determinate lifting arm structure
Stress: the crane arm is a statically indeterminate structure, and the stress is more complex than the single lifting point.
Dosage of steel structure: The boom is a statically indeterminate structure with the least amount of material.
Manufacturing: The structure of the plate tower cap is simpler than that of the fixed tower cap, and the balancing arm is more complex than that of the fixed tower cap. Double - suspension structure requires high machining accuracy of two tie - rod length.
Installation and disassembly: High installation height requirement; Installation and removal are more complex than flat heads.
