Hull and large-scale topside module connecting structure of four-upright floating platform

Abstract

The invention relates to a hull and large-scale topside module connecting structure of a four-upright floating platform. The hull and large-scale topside module connecting structure comprises hull uprights, decks, deck main girders, main supporting columns and secondary supporting columns. The hull uprights are fixedly connected with the decks through the main supporting columns, the secondary supporting columns and the deck main girders; the decks comprise upper deck layers and lower deck layers; the deck main girders are horizontally arranged between the main supporting columns and the secondary supporting columns; the upper surfaces of the deck main girders are fixedly connected with the lower deck layers, and the lower surfaces of the deck main girders are fixedly connected with the top faces of the hull uprights; the lower portions of the main supporting columns and the secondary supporting columns immerge in the hull uprights and are fixedly connected with the hull uprights; theupper portions of the main supporting columns and the secondary supporting columns are fixedly connected with the upper deck layers and the lower deck layers; and inclined struts are obliquely upwardsarranged on the main supporting columns, and the top ends of the inclined struts are fixedly connected with the upper deck layers.

Description

technical field [0001] The invention relates to an ocean engineering floating platform, in particular to a connection structure between a hull of a four-column floating platform and a large upper module. Background technique [0002] With the needs of my country's offshore oil and gas development, more and more floating platforms have begun to move from research to engineering implementation, and the scale of the platform is also increasing with the output of oil and gas fields. The four-column floating platform is a relatively mature platform form in the world. It is resistant to typhoons, has good movement, and has a balanced bearing weight. It is also one of the important facilities for offshore oil and gas exploitation in my country. [0003] For the four-pillar floating platform, the connection structure between the upper module and the hull is an important component related to the safety of the platform structure, and it is also the core basis for the safe operation of...

AI Technical Summary

Problems solved by technology

[0004] At the same time, the structure connecting the upper module and the hull is also a difficult point in design

The most common connection method is that each column supports the upper module through multiple pillars with a height of 3-4 meters (that is, there is a gap of 3-4 meters between the upper module and the hull, and each column passes 2-3 struts supporting the upper module), the disadvantage of this connection method is that the position where these struts are connected to the uprights will cause high stress and less fatigue life problems, the traditional way is to reduce by increasing the number of struts, wall thickness and diameter However, as the weight of the upper module increases, the weight borne by each pillar will increase, resulting in more and more serious structural stress and fatigue problems, although it can be achieved by increasing the number of pillars or increasing the wall of the pillars Thickness and diameter, but the more the number of pillars, the higher the cost, and the control of the butt joint accuracy of multiple pillars will increase the difficulty, and the thicker the wall thickness, the larger the diameter and the higher the cost. Imported procurement, so when the stress and fatigue life cannot be reduced through detailed design, the pillars will also be made of casting materials. The castings are generally imported. This mode will increase the construction cost and affect the construction period. , project procurement, etc. have a great influence, so in the design of this connection structure, it is necessary to use innovative design to skillfully distribute the weight of the upper module to the appropriate structure, and then transfer it to the column

[0005] For the development of deep-water oil and gas fields, due to the increase of water depth, the cost of construction will increase, which will inevitably lead to an increase in the investment of the entire project. If there are many oil and gas extraction facilities, the upper module of the platform will be heavier. If the reserved weight for other oil and gas field development and the need to store some crude oil or condensate oil are considered, the weight of the upper module will be even heavier. That is to say The development of deepwater oil and gas fields needs to solve the structural design problems of the connection between the large topside module and the hull

Due to the heavy weight of the upper module, the traditional connection structure between the upper module and the hull tends to produce large structural stress and low fatigue life at the connection, which does not meet the requirements of the code, which brings structural safety risks. Therefore, it is necessary to design a suitable The connection structure between the upper module with heavy load and the hull reduces the structural stress of the connection structure, improves the fatigue life and ensures the safety of the connection structure

Images