Truss leg structure and its asymmetric main chord

Abstract

The invention provides a truss pier leg structure and an asymmetric main chord pipe thereof. The asymmetric main chord pipe comprises a rack plate, a small cambered surface plate and a large cambered surface plate; the cross section of the small cambered surface plate is in a circular arc shape; two lateral sides of the small cambered surface plate are fixed on one side of the rack plate; the cross section of the large cambered surface plate is in a circular arc shape, wherein the radius of the cross section of the large cambered surface plate is not less than that of the small cambered surface plate; the arc length of the cross section of the large cambered surface plate is larger than the small cambered surface plate; two lateral sides of the large cambered surface plate are fixed on the second side of the rack plate. According to the truss pier leg structure and the asymmetric main chord pipe thereof, the consumed materials of main chords can be effectively controlled and meanwhile the strength of pier legs can be improved; the design of the existing surrounding wall and the matching of a lifting device and a locking device are not affected and the design cost is saved; the overlap joint and the welding of bracing pipes arranged in the same horizontal height nodes of the truss pier leg structure respectively are avoided due to the asymmetric main chord pipe, the problem of node fatigue can be solved, the machining of the bracing pipe welding intersection surface is simple, the accuracy is easy to control, the rejection rate is reduced, the polishing time is reduced, the welding operation space is increased, the operation of workers is convenient, and the welding quality is improved.

Description

technical field [0001] The invention relates to the technical field of marine engineering and large ship construction, in particular to a truss leg structure and an asymmetrical main chord pipe thereof. Background technique [0002] The hull of the self-elevating platform is supported by pile legs, and the hull can complete the lifting movement along the pile legs located in the enclosure area of ​​the hull through the upper and lower guide structures and the lifting device. When the hull is lifted to the designated position, the tightening device is locked, and the weight Transfer from the lifting device to the locking device, and keep the relative static state of the hull and the legs. For example, after the lifting device completes the pile insertion pre-ballasting action, the locking device locks the relative position between the hull and the pile legs, and the platform will stand in the ocean for operation; Above the hull, the hull floats on the sea surface, and then t...

AI Technical Summary

Problems solved by technology

However, the cost of this structure increases significantly, and the stability of the square pile leg composed of four main chords needs to be further reinforced, and the design of the surrounding well area, lifting device and locking device is completely different from the existing mainstream equipment. Design of jack-up platform with three main chord legs

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