ISO 21138-1:2020 EN 1d150973
Plastics piping systems for non-pressure underground drainage and sewerage — Structured-wall piping systems of unplasticized poly(vinyl chloride) (PVC-U), polypropylene (PP) and polyethylene (PE) — Part 1: Material specification and performance criteria for pipes, fittings and systems
现行
发布日期 :
2020-01-20
实施日期 :
ISO 21725-1:2021 EN 98fa7c61
Simplified design of prestressed concrete bridges — Part 1: I-girder bridges
现行
发布日期 :
2021-11-01
实施日期 :
ISO 21725-2:2021 EN d563811e
Simplified design of prestressed concrete bridges — Part 2: Box-girder bridges
现行
发布日期 :
2021-11-01
实施日期 :
ISO 21931-2:2019 EN 0ca7b5fd
Sustainability in buildings and civil engineering works — Framework for methods of assessment of the environmental, social and economic performance of construction works as a basis for sustainability assessment — Part 2: Civil engineering works
现行
发布日期 :
2019-05-09
实施日期 :
ISO 22282-4:2021 EN 1033783e
Geotechnical investigation and testing — Geohydraulic testing — Part 4: Pumping tests
现行
发布日期 :
2021-03-22
实施日期 :