Technology for hoisting web of girder by using rail-mounted gantry crane

Abstract

The invention relates to a technology for hoisting a web of a girder by using a rail-mounted gantry crane. The technology comprises the following specific steps: determination of the position of a hoisting point: selecting a suitable position of the hoisting point on the web of the girder, and welding a mounting stopper at the position of the hoisting point; preparation before hoisting: connecting the upper end of each triangular hanger to a hoisting steel wire rope by a shackle, connecting the left side and the right side of the lower end of each triangular hanger by using three shackles and then connecting the lower end of each triangular hanger to vertical lifting steel plate hoisting tongs; hoisting: slowly hoisting, staying for 10 minutes when distant from a jig frame by 200 mm, observing whether steel plates surrounding the vertical lifting steel plate hoisting tongs are abnormal or not, whether various force bearing points are abnormal or not and whether stress on the steel wire rope is uniform or not, and hoisting to a required height or overturning if abnormity does not exist; and hanger disassembling: after the whole web of the girder is welded with a box fixedly and firmly, disassembling the hangers. The technology for hoisting the web of the girder by using the rail-mounted gantry crane has the advantages that any consumption in aspects of discharging of parts, welding materials, gas consumption, flaw detection and the like is not required, and the production cost is greatly saved.

Description

technical field [0001] The invention relates to the technical field of a rail crane, in particular to a hoisting process for a main girder web of a rail crane. Background technique [0002] In the past, the hoisting of panel units and box webs after paneling required CNC cutting and blanking of panel unit lifting lugs of various specifications, and then the subcontractor selected the position reasonably according to the actual hoisting components and then welded and installed the lifting lugs. After the lifting lugs are used, they need to be Cutting off, cutting off the position of the lifting lug also needs to go through processes such as grinding, flaw detection and inspection, and the whole set of processes needs to spend a lot of manpower and material resources. [0003] In order to reduce the installation, cutting, repairing, grinding and other procedures of lifting lugs such as webs and plate units in the production process of conventional field bridge box girders, red...

AI Technical Summary

Problems solved by technology

[0002] In the past, the hoisting of panel units and box webs after paneling required CNC cutting and blanking of panel unit lifting lugs of various specifications, and then the subcontractor selected the position reasonably according to the actual hoisting components and then welded and installed the lifting lugs. After the lifting lugs are used, they need to be Cutting off, cutting off the position of the lifting lug also needs to be polished, flaw detection and inspection, and the whole process requires a lot of manpower and material resources

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