Double main bear multiple hanging point crane

Abstract

The present invention relates to a double-girder and multi-lifting point crane, which comprises a main beam, a lift mechanism, a translation mechanism and an electric control system. The invention is characterized in that the main beam refers to unevenly arranged double girders, while each girder is provided with a variable cross-section which is a high and narrow composite beam composed of three box-shaped beams; the lift mechanism is composed of a plurality sets of winch systems; each set of winch system respectively connects and controls a plurality of lifting points and all the lifting points are synchronously driven by the electric control system; the cinch system is provided with a rope arrangement mechanism which adopts a single-linkage and multi-layer winding rope system; the translation mechanism is a girder self-propelled bidirectional translation mechanism arranged on both ends of the lower girder; the electric control system is an electric control system of a multi-lifting point crane statically indeterminate system. The crane of the invention has the advantages of super-large lifting weight, super-large lifting height and super-large span, and is applied to the lifting and docking of super-large loading capacity of offshore drilling platform large-scale subsection, which will promote the alteration of drilling platform manufacturing mode, create enormous social benefits and have a far-reaching influence over the manufacturing of the offshore industry projects in China as well as the world.

Description

technical field [0001] The invention relates to a hoisting machine, in particular to a crane with double main girders and multiple lifting points for overall docking and manufacturing of offshore drilling platforms. Background technique [0002] As the demand for drilling platforms increases, large cranes are required to be used in the overall production of offshore drilling platforms. It is necessary to lift and assemble large sections of drilling platforms, and to adapt to different tower heights and different widths of drilling platforms. Many high-altitude operations are changed to level ground operations and one-time lifting installation, which not only saves the man-hours of drilling platform manufacturing, shortens the construction period, but also ensures the safety of personnel and improves product quality. [0003] However, since this type of crane must have super large lifting capacity (combined lifting up to 20,000 tons), super large lifting height (up to 103m), ...

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Problems solved by technology

[0003] However, since this type of crane must have super large lifting capacity (combined lifting up to 20,000 tons), super large lifting height (up to 103m), and super large span (span of 125m), it brings great challenges to design, manufacture, installation and commissioning. Unimaginable difficulties, such as how to construct the main girder, how to select the hoisting mechanism, how to arrange the multi-hoisting mechanism, how to solve the stress concentration problem caused by the opening of the steel wire rope access hole in the main girder, how to move the main girder, how to lift the load at multiple lifting points How to balance and synchronize, etc., so there is no crane of this type and lifting method in the world

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