我公司先后购置的两台重庆产QT_DF40-Ⅱ型塔式起重机,生产厂家原设计为现浇钢筋混凝土整体基础(图1)。通过使用、我们认为:原设计基础存在诸多弊病。为此,我们根据本地区的地质情况,将原现浇钢筋混凝土整体式基础改为预制钢筋混凝土组合式基础(图2)。通过两年多的使用证明,改进后的基础完全符合设计要求,它克服了原设计中的许多弊病,显示出明显的优越性。现将两种从五个方面比较如下。 The two QT_DF40-II tower cranes produced in Chongqing have been purchased by the company. The original design of the manufacturer is the integral foundation of cast-in-place reinforced concrete (Figure 1). Through use, we believe that there are many flaws in the original design basis. To this end, we changed the original cast-in-situ reinforced concrete monolithic foundation to the prefabricated reinforced concrete composite foundation based on the geological conditions in the region (Figure 2). Through more than two years of use, the improved foundation fully meets the design requirements. It overcomes many of the drawbacks of the original design and shows obvious advantages. The two are now compared from five aspects as follows.