介绍上海市政排水管道常用的承插式、企口式和钢承口式柔性接口混凝土及钢筋混凝土排水管，及其这些排水管材的生产工艺。
This article describes the concrete and reinforced concrete drain pipes with spigot and socket, rebated socket or steel-collar socket flexible joints, and the process for their fabrication.
PVC吊顶型材是中间为蜂巢状空洞、两边为封闭式的板材，有加工成型的企口和凸棒。
Profile of PVC condole top is empty, both sides is between honeycomb shape is enclosed sheet, has the processing molding tongue-and-groove and convex great.
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