Plastics piping systems for non-pressure 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
无压地下排水和排污用塑料管道系统.未增塑聚氯乙烯(PVC-U) 聚丙烯(PP)和聚乙烯(PE).第2部分:交通区域和深地下设施的人孔和检查室规范