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.
缩口式楼承板系列，更贴近民用建筑的设计，通过防火等级试验。
Contracting type deck series, it is close to the design of civilian construction, pass fireproofing grade testing.
缩口式楼承板系列，更贴近民用建筑的设计，通过防火等级试验。
Contracting type deck series, it is close to the design of civilian construction, pass fireproofing grade testing.
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