The hoisting method of large section steel truss girder

Abstract

The invention discloses a hanger used for hoisting large-section steel truss girders and a hoisting method, and relates to the hoisting field of steel truss girders. The hanger is integrally symmetric along a longitudinal center line, comprises a first connecting assembly and a second connecting assembly which are connected with each other, wherein the first connecting assembly is used for connecting lifting lugs of the steel truss girder, and the second connecting assembly is used for connecting a lifting hook of a floating crane; the first connecting assembly comprises four first steel structural components, two limiting rods, two supporting rods and four moving parts, wherein the two limiting rods and the two supporting rods are used for connecting the four first steel structural components to form a quadrangle; the moving parts are fixedly connected with the supporting rods for moving the supporting rods in a length direction of the limiting rods; the second connecting assembly comprises four second steel structural components; and each first steel structural component is connected with one corresponding second steel structural component through a flexible connector. The hanger is adjustable in hanging point distance, can be used for hoisting large-section steel truss girders with different lifting lug distances, is strong in universality and is good in economical efficiency.

Description

Technical field [0001] The invention relates to the field of hoisting steel truss beams, in particular to a method for hoisting large-segment steel truss beams. Background technique [0002] Steel truss girder installations are carried out at sea. Due to the changeable climate, strong winds, high waves, and rapid waves, such as the use of conventional bulk erection, the transportation and hoisting of steel truss members are affected by the environment, and the assembly and alignment are difficult. Coupled with the large number, it greatly affects the construction period and safety quality. Therefore, long and large bridges erected at sea generally consider factory-based, integrated, and assembly-based construction, that is, steel truss beams with whole holes or large sections (more than two inter-node lengths) are manufactured in the factory, and then transported to the bridge location. Use a large floating crane for integral hoisting and erection. [0003] Cross-sea bridges are ...

AI Technical Summary

Problems solved by technology

[0003] The sea-crossing bridge is large in scale and long in length. The whole-hole or large-segment steel truss girders erected by floating cranes have different lifting point spacings, and the traditional spreaders are basically fixed lifting point spreaders, which cannot adapt to different lifting points. The lifting unit with the same spacing, or a lifting point spacing to manufacture a set of spreaders, so economically poor

The traditional connection method between the spreader and the lifting lug of the steel truss girder is the pin connection, but for the whole hole or large section steel truss girder with heavy weight (greater than 1000t), the diameter of the pin shaft is large and the weight is heavy (greater than 200kg), which cannot be relied on. Manual handling and plugging, coupled with the influence of sea wind and waves, both the spreader and the steel truss girder are in a swinging state, and the diameter of the pin shaft is basically the same as the diameter of the pin hole of the steel truss girder lifting lug. It takes a long time. If the spreader is connected to the steel truss girder in the factory, and then the steel wire rope of the spreader is directly hung on the main hook of the floating crane after being transported to the bridge position, although the on-site operation is simple and fast, each steel truss girder segment needs Equipped with a set of spreader, the economic cost is high

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