板倒法吊装塔架结构危险工况分析

塔架结构是化工装置中的重要设施根据其特点，常采用人字桅杆扳倒法吊装。塔架在吊装过程中所承受的载荷复杂、多变、分析，计算繁复。目前工程实际中往往采用经验或静态定性分析、计算，而忽略了吊装过程中的变化情况，不能合理地采取各种措施，易导致塔由装失败，本文在运动分析的基础上推导出了危险工况的计算公式，为吊装工艺设计提供了依据。

Analyzing Danger Case of Lifting up Tower Structure by Way of Pulling down

Tower structures are important device in the chemical equipment. They were lifted up by pulled down shearlegs. Tower structures' load is complex and changeful within lifting up. It is multifarious to analyze and to compute. At present, because people always adopts experiential or static analyzing and computing, one neglects changed circumstance and can adopt irrationally kinds of measures. It leads to break down tower structures and be lost in lifting up. This paper deduces computing formulae of danger case and provides basis for design for technics of lifting up according to analyze movement.