地下雨水管 【篇一：非承压地下雨水管和污水管用塑料管道系统 en 13598-2 2009 】 bs en13598-2:2009 plastics piping systems for nonpressure underground drainage and sewerage — unplasticized poly(vinyl chloride) (pvc-u), polypropylene (pp) and polyethylene (pe) part 2: specifications for manholes and inspection chambers in traffic areas and deep underground installations 无压埋地排雨水和排污水用塑料管道系统 —未增塑聚氯乙烯 (pvc-u) 、 聚丙烯（ pp） 和聚乙烯