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长期以来,现场浇制混凝土结构的方法主要是采用传统的固定式模板。二十年代初期开始出现了滑动模板这种新的施工方法。在最初的发展阶段,提升模板主要是采用手动千斤顶——螺旋式或液压式,完全是用人工操作。当时,这种方法,主要用于高度比较大的和等截面的筒壁结构物,比采用固定式模板节省了很多脚手材料和劳动力,大大缩短了工期。但是,所需要的劳动力仍然比
For a long time, the method of cast-in-place concrete structures in the field has mainly been the use of traditional fixed templates. In the early 1920s, a new construction method of sliding formwork began to appear. In the initial development stage, the lifting template was mainly manual jacks - spiral or hydraulic, and it was entirely manual. At that time, this method was mainly used for taller and equal-section wall structures, which saved many footer materials and labor, and greatly shortened the construction period. However, the required labor force is still lower than