基于抱箍吊装技术的大吨位薄壁筒屈曲稳定性研究

Research on Buckling Stability of Large Thin-walled Cylinder Based on Steel Hoops-supported Hoisting Technology

针对化工行业中大吨位薄壁筒的吊装问题,提出了一种适用于薄壁筒吊装的新型双抱箍结构。对比分析了薄壁筒在传统单抱箍和新型双抱箍作用下的受力特点,提出了简化的力学模型并分别推导在单、双抱箍作用下薄壁筒屈曲稳定性计算公式,探讨了抱箍尺寸参数对薄壁筒稳定性的影响。以300t硝酸吸收塔吊装为例,用有限元方法对所推导公式进行验证,结果表明:所推导公式的计算结果与有限元计算结果相近,可作为抱箍设计计算时的参考;双抱箍结构可改善薄壁筒在吊装时的受力情况,提高吊装时薄壁筒的稳定性。

Aiming at the hoisting of large thin-walled cylinders in chemical industry,a new structure with dual-hoop was introduced. Through respective analysis of the force status of the thin-walled cylinder with single hoop or dual-hoop,a simplified mechanical model was proposed to deduce buckling stability＇s calculation formula of the thin-walled cylinder with single hoop or dual-hoop,including analysis of the influence of steel hoop＇s dimension parameters on the cylinder stability. Taking the hoisting of 300 t acid-absorption tower as example,verifying the formula with FEA method shows that,the formula＇s calculation result closes to FEA method and can be taken as a calculation reference of buckling stability; and dual-hoop structure can benefit the force status and improve hoisting stability of the thin-walled cylinder.