海上平台大型储罐整体吊装的设计与应用

Design and application of integral hoisting of large-scaled storage tank on offshore platform

某海上平台大型储罐需陆地建造后海上整体吊装。针对此种薄壁结构物,为解决整体吊装防变形问题,对储罐的吊耳进行了增大吊耳本体及吊耳垫板的尺寸优化设计;为防止罐体的径向变形,采用吊装框架进行吊装,并对框架强度进行结构计算;为解决大型储罐底板的吊装变形问题,采用在储罐底部增加了与罐体底部焊接的十字交叉T型梁加强罐底板的设计方案,并运用ANSYS Workbench有限元软件对罐体进行整体建模计算,模型包括罐体、吊耳以及加强结构。最终设计出了一种能够有效解决储罐吊装变形,且可实现加强结构免拆除、施工免动火以及免除搭设大量脚手架的方案。最后通过工程实践证明了设计方案的可行性。

The large storage tank of an offshore platform needs fabricated onshore and installed offshore.For this kind of thin-walled structure,in order to solve the deformation problem in integral hoisting,the size optimization design of the hoisting lugs of the tank was carried out;in order to prevent the radial deformation of the tank,the lifting frame was used and the frame strength was calculated.In order to solve the problem of hoisting deformation of the large storage tank bottom,the design scheme using the decussating T-beam welded to the tank bottom to reinforce the tank bottom was adopted,and the integral modeling calculation of the tank body was carried out by finite element software ANSYS Workbench(the model includes tank body,hoisting lugs and strengthened structure).Through above-mentioned work,a scheme was designed which can effectively solve the deformation in the tank hoisting,and can realize the structure reinforced without demolition,construction without hot work and avoiding erection of a large number of scaffolds.Finally,the feasibility of the design scheme was proved by engineering practice.