CN-122013880-A - Large-span closed torsion-resistant lattice system for offshore converter station

CN122013880ACN 122013880 ACN122013880 ACN 122013880ACN-122013880-A

Abstract

The invention relates to the technical field of ocean engineering, in particular to a large-span closed torsion-resistant framework system for an offshore converter station, which comprises a horizontal rigid layer, a main truss system and a secondary truss system, wherein the horizontal rigid layer is divided into a bottom horizontal rigid layer and a top horizontal rigid layer which are arranged in an upper-lower parallel and spaced mode, the horizontal rigid layer comprises an in-plane supporting truss and a circumferential truss, the circumferential truss is of a space closed structure surrounding the periphery of the in-plane supporting truss, the transverse torsion-resistant partition extends vertically and is connected between the bottom horizontal rigid layer and the top horizontal rigid layer, the upper end and the lower end of the main truss system are respectively connected with the circumferential trusses of the bottom horizontal rigid layer and the top horizontal rigid layer, the main truss and the secondary truss are vertical and enclose a ring shape. The system forms a core stress framework together through a horizontal rigid layer at the bottom and the top of the integrated valve hall, a transverse torsion partition serving as an internal core and a main truss system and a secondary truss system which work cooperatively, and provides higher protection for internal equipment in a marine environment.

Inventors

CHEN CHANGBING
YANG CAN
HOU SHIJIN
SONG YUANHAO
DING XIAOQIANG
SUN XIAOHONG
LI XU
WANG YANQIANG
LIU CHANGBIN
CHEN JIE
SUN SHUZHENG
DONG YAN

Assignees

山东电力工程咨询院有限公司

Dates

Publication Date: 20260512
Application Date: 20260204

Claims (10)

1. A large span closed torsion lattice system for an offshore converter station, comprising: The horizontal rigid layer is divided into a bottom horizontal rigid layer and a top horizontal rigid layer which are arranged in parallel at intervals, the horizontal rigid layer comprises an in-plane supporting truss and a circumferential truss, and the circumferential truss is a space closed structure surrounding the periphery of the in-plane supporting truss; A transverse torsion-resistant partition vertically extending and connected between the bottom horizontal rigid layer and the top horizontal rigid layer; the upper end and the lower end of the main truss system are respectively connected with the annular trusses of the bottom horizontal rigid layer and the top horizontal rigid layer, the main truss system comprises a main truss and a secondary truss, and the main truss and the secondary truss are perpendicular and encircle to form an annular shape.
2. The large span closed torsion lattice system of claim 1, wherein the circumferential truss is formed in a ring shape from a plurality of space closed lattice cells connected end to end in a horizontal direction.
3. The large span closed torsion resistant lattice system of claim 2, wherein the space closed lattice units are cuboid skeletons of chords, diagonal braces disposed in a cross arrangement being provided in each rectangular surface of the cuboid skeletons.
4. The large span closed torsion lattice system of claim 1, wherein the in-plane support truss comprises an upper chord, a lower chord and web members connected therebetween, the web members comprising diagonal web members arranged in a cross.
5. The large span closed torsion resistant system of claim 1 wherein the lateral torsion resistant partition is provided on both sides with an M-type diagonal bracing system comprising a lower M-type diagonal bracing set connected between the bottom horizontal rigid layer and the middle deck layer and an upper M-type diagonal bracing set connected between the middle deck layer and the top horizontal rigid layer.
6. The large span closed torsion lattice system of claim 5, wherein the lower and upper sets of M-struts each comprise two downwardly sloping struts and two upwardly sloping struts which meet at a central portion to form an "M" truss.
7. The large span closed torsion lattice system of claim 1, wherein the main truss comprises multiple deck plates arranged in vertical spacing, columns connected between adjacent deck plates, and first and second diagonal braces connected diagonally between the columns and deck plates of different heights.
8. The large span closed torsion resistant framework of claim 7 wherein the first and second diagonal braces are disposed with a middle deck as a plane of symmetry, the first and second diagonal braces and the columns and deck together forming a double "m" structure.
9. The large span closed torsion lattice system of claim 1, wherein the secondary truss comprises multiple decks vertically spaced apart, columns connected between adjacent decks, and first and second diagonal braces parallel spaced apart, the first and second diagonal braces being connected diagonally between the columns and decks of different heights.
10. The large span closed torsion lattice system of claim 9, wherein the first diagonal struts of the secondary trusses have support sections in the underlayment deck area that cooperate with the bottom horizontal rigid layer to collectively form an "M" truss structure.

Description

Large-span closed torsion-resistant lattice system for offshore converter station Technical Field The invention relates to the technical field of ocean engineering, in particular to a large-span closed torsion-resistant framework system for an offshore converter station. Background The offshore converter station is a key facility in an offshore direct current transmission system, and an upper assembly of the offshore converter station is used as an integrated platform and is required to bear a plurality of loads such as a valve hall, control equipment, an auxiliary system and the like. The platform is under the action of complex ocean environmental loads such as wind, wave and current for a long time, and meanwhile, the platform also needs to be subjected to a special working condition of offshore floating transportation after construction is completed. Therefore, its structural design must ensure adequate overall rigidity, stability and fatigue life while meeting the large space required for equipment arrangement and operation and maintenance. The valve hall is used as a place for installing precise heavy equipment such as a displacement valve, and the like, and the structure of the valve hall is generally required to have the characteristics of large span and high clearance, so that the valve hall provides a serious challenge for the structural type of the upper assembly. Currently, the upper modules of such offshore converter stations commonly employ conventional steel frame structural systems as their primary load-bearing structures. The system is generally composed of steel columns regularly arranged in the longitudinal and transverse directions, and cross beams and stringers connecting the steel columns to form a basic space frame. On this basis, steel floor boards are laid on each layer, so that a deck level capable of bearing equipment and personnel is formed. The above-described structure has been found to have a technical problem in use in that, firstly, the overall torsional rigidity of the structure is significantly insufficient. The traditional frame system essentially belongs to an opening section form, has weak torque resistance, is difficult to effectively restrict torsional deformation which is necessarily generated under the action of complex sea conditions and eccentric loads, and forms potential threat to the normal operation of internal precise electrical equipment. Secondly, the horizontal load transmission path is not smooth and the efficiency is low. The frame structure relies on the bending of beam column joints to transfer horizontal force, and a force transfer path is roundabout, so that the structure is greatly deformed, and stress concentration is easily formed in a joint area. Again, the overall stability of the structure, especially in the off-site condition of floating transport, is poor in deformation control. The bending rigidity of the large-span frame is limited, and larger deflection can be generated in the transportation process, so that the structural safety and the positioning accuracy are affected. Finally, there is a decoupling between the architecture and the usage functions. In order to meet the bearing requirement of heavy equipment in a large-span valve hall, additional local reinforcement is often needed below the equipment, and the patched design not only increases the steel consumption and engineering complexity, but also fails to realize the optimal utilization of material performance. Disclosure of Invention Aiming at the problems that the traditional frame-support system has insufficient torsional rigidity and is difficult to effectively resist complex environmental load, which are pointed out in the background art, the embodiment of the invention constructs a core stressed framework by establishing a complete space closed lattice system, wherein the system is formed by integrating a horizontal rigid layer at the bottom and the top of a valve hall, a transverse torsional partition serving as an internal core and a main truss system and a secondary truss system which work cooperatively. The valve hall with large span of the large-scale offshore converter station is converted into a steel structure capable of transmitting and distributing complex loads. In order to achieve the above object, the embodiment of the present invention provides the following technical solutions: A large-span closed torsion-resistant lattice system for an offshore converter station comprises a horizontal rigid layer, a transverse torsion-resistant partition, a main truss system and a secondary truss system, wherein the horizontal rigid layer is divided into a bottom horizontal rigid layer and a top horizontal rigid layer which are arranged in an upper-lower parallel and spaced mode, the horizontal rigid layer comprises an in-plane supporting truss and a circumferential truss, the circumferential truss is of a space closed structure which surrounds the periphery of the in-plane supp