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1986年元月,我国第一座大跨度钢筋混凝土梁桁拱渡槽在四川威远县整体吊装合拢成功,这个渡槽在设计上采用了将输水构件(槽壳),传力构件(立柱、斜拉杆),支承构件(拱)三者组合而成的整体结构方案,在施工方面采用了全新的顶推——竖向转体整体吊装合拢方案,吊装绳采用的是单线走通的多吊点组合千斤绳,其最大顶推吊装力360吨(见图1,2)。由分析知,对于这种组合千斤绳,由于各条长度不一和各转向滑轮有摩擦力存在,在吊装时,各条钢绳张力是不均匀的。显然,
In January 1986, the first long-span reinforced concrete beam truss arch aqueduct in China was successfully lifted and hoisted in Weiyuan County, Sichuan. The aqueduct was designed with water diversion members (tank shells), transmission members (columns, Rod), supporting members (arch) the combination of the three overall structure of the program, in the construction using a new push - vertical swivel overall lifting and lifting programs, lifting rope is used to go through the single-point multi-hanging point Combined jacking rope, the maximum thrust lifting capacity of 360 tons (see Figure 1,2). From the analysis, for this combination jacking rope, due to the different lengths and the steering pulley friction, lifting, the tension of the steel wire is not uniform. Obviously,