以前地埋式混凝土管道多为预制生产,然后运到铺管现场对接,这样不仅成本高,铺管进度慢,而且运输容易损坏,接头漏水不好处理。1974年以来,我们利用混凝土的可塑性,研究混凝土管道的现场制铺工艺和机具,经过五次大的改进,1986年11月发明了WD-Ⅰ型混凝土管道制铺机(产品专利号86107919)。在WD-Ⅰ型混凝土管道制铺机基础上,1988年又研制出WD-Ⅱ型混凝土管道制铺机(见封三)。该机由电 In the past, most of the buried concrete pipes were prefabricated, and then transported to the pipe laying site for docking, which not only resulted in high costs but also slow pipe laying and easy transportation damage. Since 1974, we have made use of the plasticity of concrete to study on-site fabrication technology and equipment of concrete pipes. After five major improvements, we invented the WD-Ⅰ concrete pipe laying machine in November 1986 (product patent No. 86107919). On the basis of WD-Ⅰ type concrete pipe laying machine, 1988 also developed WD-Ⅱ type concrete pipe laying machine (see seal three). The machine by electricity