美利体育登录入口官网:BS 5911-1:2021
混凝土管道和附属混凝土 非钢筋和钢筋混凝土管道(包括顶管)和带柔性接头的配件(补充 BS EN 1916:2002) 规格
Concrete pipes and ancillary concrete. Unreinforced and reinforced concrete pipes (including jacking pipes) and fittings with flexible joints (complementary to BS EN 1916:2002). Specification