美利体育登录入口官网:DIN EN ISO 21225-2 E:2017-09 地下管网非开挖更换用塑料管道系统 第2部分:通过水平定向钻孔和冲击成型进行离线更换(草案)
Plastic pipe systems for trenchless replacement of underground pipe networks Part 2: Offline replacement by horizontal directional drilling and impact forming (draft)