施工升降机单肢稳定性计算校核

Calculation and Verification of Single Limb Stability of Construction Lifts

施工升降机导轨架设计中普遍存在对单肢稳定性校核计算重视程度不足的问题,导致在设计时只确保导轨架整体稳定性应力值小于许用应力,在使用过程中仍会出现导轨架失稳现象。文章依据GB26557-2011《吊笼有垂直导向的人货两用施工升降机》中的相关规定,通过分析比较导轨架在各工况下应计算的不同载荷组合,提出了异常情况下安全装置作用工况为单肢受力最危险的工况,分析比较了最危险工况下导轨架所有危险截面,确定了在吊笼分别位于导轨架上端和底架与最下附墙架中间时,底架与最下层附墙架中间导轨架截面为最危险截面,给出了最危险工况下最危险截面处单肢稳定性计算校核方法。以SC200/200施工升降机为例,对其单肢稳定性进行了校核,解释了目前广泛使用的施工升降机,在受到较大冲击后导轨架产生失稳的原因。

In the design of the construction elevator, the problem of insufficient attention to the calculation of the stability of the single limbs is found, which leads to the fact that only the stability stress of the rail frame is less than the allowable stress in the design. In the course of use, stable phenomenon, according to GB26557-2011 “hanging cage with vertical guide the dual-use construction of the lift,” the relevant provisions of the comparison through the rails under the conditions of the load should be calculated under different load combinations, put forward the exception of the safety device. The most dangerous working conditions of the single limb are analyzed and compared with all the dangerous sections of the rail frame under the most dangerous conditions. It is determined that the cage is located in the middle of the guide rail frame and the bottom frame and the bottom. The cross section of the middle section of the middle frame is the most dangerous section, and the verification method of the single limb stability calculation under the most dangerous cross section of the most dangerous condition is given. Taking the SC200/200 construction lifts as an example, the stability of the single limbs is checked, which explains the reason why the construction lifts are widely used and the instability of the rails after the impact is large.