... collar piping 地面套管 collar socket 接箍打捞工具 collar step bearing 环形阶式轴承 ...
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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.
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。
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