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一、概述六十年代初,预应力钢筋混凝土圆孔板挤压成型机在美国、加拿大等发达国家相继问世。这种机器具有工效高,产品质量好,节约钢材水泥,劳动强度低等特点,因此引起各国建筑界的重视。七十年代我国开始研制这种设备,在几年的时间里就生产出各种型式规格的挤压机。其中,我公司混凝土构件二厂于1973年研制成功12cm厚圆孔板挤压机并应用于生产。国家建委于1974年7月在大
I. Overview In the early 1960s, pre-stressed reinforced concrete circular orifice plate extrusion machines were introduced in developed countries such as the United States and Canada. This kind of machine has the characteristics of high ergonomics, good product quality, saving steel and cement, low labor intensity, etc., which has attracted the attention of the construction community in various countries. In the 1970s, China started to develop this type of equipment. In a few years, it has produced various types of extruders. Among them, the company’s Concrete Component No. 2 Plant developed a 12-cm-thick circular-hole plate extruder in 1973 and applied it to production. The National Construction Commission was inaugurated in July 1974