An airbag-filled truss for large offshore platforms

Abstract

The invention discloses an air bag filling type truss for a large ocean platform. Air bag supporting frames are used for replacing transverse diagonal web members in space trusses, and then air bag filling is performed, so that the air bag filling type truss is formed. The air bag filling type truss is composed of longitudinal chord members, transverse chord members, vertical web members, longitudinal diagonal web members, the transverse air bag supporting frames and an air bag. The air bag supporting frames are connected with the reserved fixing ends of the truss through reserved connectors via bolts. After the air bag is filled with air, the whole air bag filling type truss can bear external loads and also can provide buoyancy in water. A lot of air bag filling type trusses and the space three-dimensional trusses are connected according to a certain rule so that the large ocean platform structure can be formed. The air bag filling type truss maintains the advantages that the air bag structure is light and good in buoyancy performance, and the space trusses are convenient and rapid to construct and high in rigidity, and forms a floating structure system which is light, high in strength, convenient to construct, convenient and rapid to expand and capable of achieving partial balance between internal air pressure of the air bag and external water pressure.

Description

Technical field [0001] The invention relates to a marine floating structure system, in particular to an airbag-filled truss for a large-scale offshore platform. platform. Background technique [0002] In the field of marine engineering, floating structures have received widespread attention as the basic platform for offshore construction operations, production, processing and storage. As early as 1937, the earliest mobile platform appeared in the world: the barge drilling platform, and then the semi-submersible drilling platform appeared. With the continuous increase of working water depth, tension leg platform (TLP), single column platform (Spar), floating (ship) production storage and transportation unit (FPSO) have been launched one after another, and now very large floating structure (VLFS) ) also started to appear. Although the emergence of the above-mentioned platform structures can meet the requirements of most offshore production operations, they all have disadvan...

AI Technical Summary

Problems solved by technology

Patent Nos. 200310103471.7 and 200410004398.2 are inventions. Although trusses are introduced into the floating body structure, the floating body providing buoyancy is still a traditional rigid shell structure. This invention is similar to a traditional multihull ship. When the plane area of ​​the entire structure is large When the rigid shell is required to have a larger diameter, this will increase the difficulty of construction, and the requirements for the stability of the cylindrical shell itself limit the scale of the entire structure. It will cause greater stress to the upper structure, and it is difficult to guarantee the rigidity of the upper truss

The invention with the patent number 200920003571.5 combines the frame and the floating body filled with foam material through a hinge to form a floating body unit. The hinge connection is difficult and the connection performance between the hinge and the floating body cannot be guaranteed

In addition, since this kind of floating body can only be used on the water surface, the seakeeping performance of the structure composed of it will be poor, and it may even sway with the waves

In addition, there are marine engineering floating grid structures. Although the appearance of this type of structure can reduce the construction difficulty and the structure scale can meet the requirements of different projects, it only relies on connecting hollow nodes to provide buoyancy. With the increase of buoyancy requirements, the ball The diameter and wall thickness of the node should also increase, and it is very likely that the diameter of the node will exceed the effective length of the member

Generally speaking, the existing invention basically has the following disadvantages: 1) It changes the current situation that members in the truss structure mainly bear axial loads, thus losing the advantages of light weight and high strength of the truss structure

2) The pressure-bearing capacity of the buoyancy-providing floating body is seriously insufficient, and a large wall thickness and complex structure are required to improve its pressure-bearing capacity. In large-scale platform structures, the advantages of light weight, high strength and high floating body will also disappear

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