Girderr crane using three-point statically indeterminate hoisting system

Abstract

The invention relates to a girder crane for a three-lifting joint statically indeterminate lifting system. A crane frame adopts a rhombohedral frame structure. The frame structure comprises a top rhombohedral structure body, an upright post rhombohedral structure body, a chassis rhombohedral structure body, a rear pull rod and a front stay bar, and the three pieces of rhombohedral structure bodies are tied together through space connection, wherein the upper end of the rear pull rod is hinged with the upright post structure body, and the lower end of the rear pull rod is hinged with the tail end of a main longitudinal girder of the chassis rhombohedral structure body; and the upper end of a main limb of a sway rod is hinged with the front end of a main longitudinal girder of the top rhombohedral structure body, and the lower end is connected with a flange bolt at the front end of the chassis rhombohedral structure body. A method for controlling the crane comprises that: lifting reversing winches of the girder lifting joints on both sides are synchronously controlled, and a middle lifting joint reversing winch adopts synchronous track and load proportion control. The girder crane solves the problems that three girder nodes of a steel girder have unstable structure because of not forming a bridge and are easy to deform in the hoisting process. The girder crane evenly applies the weight of the steel girder onto the formed bridge, improves the figure of the steel girder nodes formed into the bridge and solves the problem of the influence of the cable force of a steel cable.

Description

Technical field [0001] The invention belongs to a lifting equipment. In particular, it is a girder crane using a three-point statically indeterminate lifting system. Background technique [0002] At present, large-scale construction equipment technology has been widely used in the construction of high-speed railways and bridges. This type of large-scale construction equipment mostly introduces, digests and absorbs advanced foreign technology. For example, the main bridge of Wuhan Tianxingzhou Yangtze River Bridge with dual-purpose road and rail is a (98m+196m+504m+196m+98m) double-tower and three-cable plane cable-stayed bridge with a total length of 1092m. The main girder of the cable-stayed bridge is a plate-truss combined steel truss girder, three main trusses, welded integral nodes, N-type trusses, truss height 15.2m, truss width 2×15m, inter-node length 14m, and maximum segment weight is 650t. This kind of steel truss beam segment is heavy and has a complicated structure. In...

AI Technical Summary

Problems solved by technology

For the series-parallel rotor resistance method, the control accuracy is not high, the start-up impact is large, and the energy consumption resistance is prone to failure

Pure frequency converter solution, the lifting action is relatively stable, but it is difficult to complete the lowering and precise alignment operations, and it is necessary to increase the braking unit and braking resistor on a large scale to consume the lowering energy.

For the entire equipment, first, the overall cost of the equipment is increased, and second, the scale and maintenance difficulty of the electrical system are increased

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