BH GSO ISO 13266:2016 非压力地下排水和污水处理用热塑性塑料管道系统 检查室和沙井用热塑性塑料竖井或立管 表面和交通荷载阻力的测定
Thermoplastics piping systems for non-pressure underground drainage and sewerage - Thermoplastics shafts or risers for inspection chambers and manholes - Determination of resistance against surface and traffic loading