ICS 83.120 Q 23 GB 中华人民共和国国家标准 GB/T21492—2019 代替GB/T21492—2008 玻璃纤维增强塑料顶管 Glassfiberreinforcedplasticsjackingpipes [ISO 25780:2011,Plastics piping systems for pressure and non-pressurewater supply,irrigation,drainageor sewerage Glass-reinforced thermosetting plastics (GRP) systems based on unsaturated polyester (UP) resin-Pipes with flexible joints intended to be installed using jacking techniques,NEQ 2019-08-30发布 2020-07-01实施 国家市场监督管理总局 发布 中国国家标准化管理委员会