高水头钢筋混凝土管,主要是用振动水力挤压方法制成的。这种工艺的特点是:复杂性增加,以及对组成材料的质量与各工序的完成要求很严格。因此,在大多数地区的工厂仅生产数量不多,大部份是耐压性为Ⅰ和Ⅱ级一般范围的管。此外,在实际工程中,每第二或第三个管子就可看到混凝土保护层的层状物,由此引起螺旋骨架预应力钢筋加速锈蚀,管子使 High-head concrete reinforced concrete pipes are mainly made by vibrating hydraulic extrusion. The characteristics of this process are: increased complexity, and strict requirements on the quality of the constituent materials and the completion of each process. As a result, only a small number of plants are produced in most regions, most of which are tubes of the general range of pressure resistance class I and II. In addition, in the actual project, every second or third pipe can see the layer of the concrete protective layer, which causes the spiral frame prestressed steel bar to accelerate the corrosion and the pipe makes