Lifting systems for structurally asymmetric objects

Abstract

The invention discloses a hoisting system for a structurally asymmetric object, which includes a cantilever crane and a hanger suspended on the cantilever crane for fixed connection with the structurally asymmetric object, the hanger includes a lifting bracket and A plurality of lifting lugs arranged under the lifting bracket, wherein the lifting bracket includes a structurally symmetrical base bracket and an additional bracket arranged on the base bracket; the lifting lugs include a base hanger fixed under the base bracket lugs and modified lugs. The hoisting system for the structurally asymmetric object of the invention has a wide application range, is easy to realize, and has low processing cost of the hoisting tool.

Description

technical field [0001] The invention relates to the field of road and bridge construction, in particular to a lifting system for structurally asymmetric objects. Background technique [0002] On the premise that the object is homogeneous, the center of gravity or the line of the center of gravity of the object is only related to its shape. For an object with a regular shape, its geometric center line and the line of the center of gravity coincide; for an object with an irregular shape, the center of gravity of the object The line can be obtained by calculation or experimental methods, and the position of the center of gravity obtained by calculation is also the geometric center and mass center of the irregularly shaped object. When the object is heterogeneous, the geometric center (line) and the actual center of gravity (line) of the object do not coincide. [0003] For partially pre-assembled building components, the contour shape of its surface is approximately regular an...

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Problems solved by technology

However, its disadvantages are also prominent. Because in order to obtain a reasonable stress angle, the angle of the inclined rod is usually not less than 45°, so the overall working height of the spreader III is relatively large, and there are requirements for the working clearance height, so it can only be used with some models. The use of cantilever crane IV;

[0009] Second, the pole-type hydraulically adjustable spreader, its main principle is to use the characteristics of better bending and tensile stress of steel, which is the same as the conventional pole beam. By selecting different cross-sections to meet the required working load, it can be moved by moving The hydraulic torque conversion system that changes the position of the lifting center of gravity realizes the transfer of the center of gravity; the shoulder-type hydraulic adjustable spreader has low requirements for working height, and can easily realize the lifting of asymmetric steel box girders (or other building components). However, due to the hydraulic system The introduction of the new system will make its structure more complicated, which will increase the cost of the spreader and the cost of later maintenance and repair. Moreover, the adjustable range of the hydraulic torque conversion system is limited, and the position of the anchor point cannot be changed. When the position of the steel box girder lifting point occurs Unavailable when changed

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