Large-span pre-stressed main girder portal crane

Abstract

The invention relates to a lifting device, in particular to a large-span pre-stressed main girder portal crane. The large-span pre-stressed main girder portal crane comprises pre-stressed main girders, end beams, anti-rust and anti-flying anchor sleeves, transverse frames, lifting vehicles, supporting legs, lower cross beams and large vehicle operating mechanisms, the pre-stressed main girders aremounted on the supporting legs, the end heads of the two main girders are connected through the end beams, the transverse frames preventing side bending are mounted at the upper parts of the main girders, and the anti-rust and anti-flying anchor sleeves are mounted on the end faces of the pre-stressed main girders; and the lower cross beams are mounted at the bottom ends of the supporting legs, the large vehicle operating mechanisms are mounted on the lower cross beams, the crane can move longitudinally, the lifting vehicles are mounted on the transverse moving rails of the main girders, andthe hoisting operation is completed. The main girders are composed of rectangular beams and pre-stressed arch frames, the section assembling is achieved, the transportation assembly is convenient, andthe structure is simple and economical. The large-span pre-stressed main girder portal crane adopts pre-stressed main beams, make full use of the tensile strength of high strength steel strand, and makes up for the technical blank of the large-tonnage pre-stressed steel structure, the self weight is low, the cost is low, and the market demand of large-span portal crane of a station dock can be met.

Description

technical field [0001] The invention relates to a lifting device, in particular to a large-span prestressed girder gantry crane. Background technique [0002] Patent document CN201610718338.X discloses a main girder of a gantry crane, which uses a fish-belly section to improve the bearing capacity of the main girder of the crane. But this device has the following disadvantages: [0003] 1. The main girder is welded by ordinary steel structure without preset anti-arch. When it is suitable for large-span gantry cranes, the section rigidity requirements become higher, which requires higher section and larger plate thickness. [0004] 2. The vertical stiffness of the main girder is small, and the downward deflection deformation is large, resulting in a large climbing of the lifting trolley. [0005] 3. This type of main girder is only suitable for small and medium-span gantry cranes. If it is extended to be used for large-span gantry crane main girders used in railway freight ...

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Problems solved by technology

[0004] 2. The vertical stiffness of the main girder is small, and the downward deflection deformation is large, resulting in a large climbing of the lifting trolley

[0005] 3. This type of main girder is only suitable for small and medium-span gantry cranes. If it is extended to be used for large-span gantry crane main girders used in railway freight yards, ports, etc., the amount of steel must be increased to meet the rigidity and strength requirements. No longer has the advantage of low manufacturing cost

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