An airbag beam truss for large offshore platforms

Abstract

The invention discloses an air bag girder type truss for a large offshore platform. An air bag girder is used for replacing a web rod layer of an n-truss longitudinal plane truss in the traditional space stereo truss. The air bag girder type truss consists of longitudinal chord rods, transverse chord rods, vertical web rods, transverse oblique web rods, longitudinal oblique web rods and the air bag girder, wherein the air bag girder consists of an elliptical air bag, an air bag upper arc girder, an air bag lower arc girder, air bag hoops, upper arc girder support rods and lower arc girder support rods; after certain air pressure is filled into the elliptical air bag, the whole air bag girder type truss can carry external load and provide buoyancy in water; a large number of air bag girder type trusses and the space stereo truss are mutually connected according to certain rule, so as to form a large offshore platform structure. The air bag girder type truss has the advantages that the weight of the air bag structure is light, the buoyancy property is good, the construction of the space truss is convenient and rapid, and the rigidity is high; a floating type structure system with light weight, high strength, convenient construction, rapid and convenient scale expansion, and partial balance of internal air pressure and external water pressure is formed.

Description

[0001] Technical field [0002] The invention relates to a marine floating structure system, in particular to an airbag beam type truss used for large offshore platforms, and its application scope includes offshore oil production platforms, offshore processing platforms, offshore wind turbine foundation platforms, offshore hotels and offshore construction platform. Background technique [0003] 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 stru...

AI Technical Summary

Problems solved by technology

For example, the patent No. 200720059012.7 is a foundation for building a floating house on water. Airbags are directly inserted into the truss structure. Although it plays a role in carrying and providing buoyancy, it ignores the fact that the members in the truss cannot be bent. Mechanics concept, which greatly reduces the load-carrying capacity of the structure

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 large-diameter rigid shell will increase the difficulty of construction, and the stability of the shell can not be well satisfied, in addition, the presence of wave input phase difference between each floating body will cause greater stress on the upper structure , the stiffness of the upper truss is also difficult to guarantee

The invention with the patent No. 200920003571.5 combines the frame and the floating body filled with foam material through a hinge. The hinge connection is difficult and the connection performance between the hinge and the floating body cannot be guaranteed; in addition, this floating body can only be used for Above the water surface, the structure composed of it has poor seakeeping performance, and 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 nodes should also increase, and it is very easy to have the unrealistic situation that the diameter of the nodes exceeds the effective length of the member

Generally speaking, the existing invention basically has the following disadvantages: 1), the status quo that members in the truss structure mainly bear axial loads has been changed, thereby 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

Images