标准号:IS 4111 Pt.1-1986
发布日期:1986/11/1 12:00:00
实施日期:1999/12/31 12:00:00
适用范围:1.1 This standard covers types of manholes, design considerations for manholes and their construction and safety requirements.1.2 This standard applies to manholes built for public sewers and does not cover manholes built specifically for building drainage (see IS : 1742-1983〓 ).