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过去建造钢筋混凝土烟囱需要在筒身内部搭设一座高大的金属竖井架,作为高空作业的主要支柱,工作平台、模板,运料和人员上下都要依靠它,没有它就没有“生根”的地方。竖立一座井架要耗用大量人力,而且劳动强度很大,需要三、四十吨好钢材,安装和拆除时间要半月以上,还要用大量揽风绳加以固定,工序烦琐,还有一定的危险性。过去,十
In the past, the construction of reinforced concrete chimneys required the erection of a tall metal mast frame inside the shaft. As the main pillar of high-altitude operations, the working platform, formwork, transportation materials and personnel must rely on it. Without it, there is no “rooting”. local. The erection of a derrick consumes a lot of manpower, and the labor intensity is very heavy. It requires 30 to 40 tons of good steel. The installation and demolition time is more than half a month. It must be fixed with a large number of wind ropes. The procedures are cumbersome and there is a certain risk. Sex. Past ten