1 Scope and field of application
2 Concepts, symbols and shaft components
2.1 Concept
2.2 Symbols
2.2.1 Symbols denoting manhole components
2.2.2 Symbols denoting quantities
2.3 Shaft components
2.3.1 Rebated shaft section
2.3.2 Rebated single-unit shaft
2.3.3 Rebated reducing section
2.3.4 Rebated reducing slab
2.3.5 Rebated straight-back taper
2.3.6 Rebated cover slab
2.3.7 Seating ring
3 Requirements
3.1 Materials
3.1.1 Unreinforced concrete
3.1.2 Reinforced concrete
3.1.3 Sealing materials
3.2 Dimensions
3.3 Strength and stability
3.3.1 Crushing strength of shaft sections
3.3.2 Strength of fragments
3.3.3 Stability
3.4 Watertightness
3.5 Jointing of components
4 Testing
4.1 Materials
4.1.1 Unreinforced concrete
4.1.2 Reinforced concrete
4.1.3 Sealing materials
4.2 Dimensions
4.3 Strength and stability
4.3.1 Crushing strength of shaft sections
4.3.2 Strength of fragments
4.3.3 Stability
4.4 Watertightness
5 Access facilities
5.1 Hand grips
5.2 Step irons
5.3 Ladders
6 Inspection
6.1 General
6.2 Internal control
6.3 Third-party inspection
7 Marking