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BS EN 12889:2022 Trenchless construction and testing of drains and sewers, 2022
- undefined
- 1 Scope
- 2 Normative references
- 3 Terms and definitions
- 4 General [Go to Page]
- 4.1 Technical principles
- 4.2 Safeguarding design decisions
- 5 Construction components and materials [Go to Page]
- 5.1 General
- 5.2 Pipes and joints
- 5.3 Manholes and inspection chambers
- 5.4 Delivery, handling and transportation on site
- 5.5 Storage
- 5.6 Other materials
- 6 Techniques [Go to Page]
- 6.1 Classification
- 6.2 Unmanned techniques [Go to Page]
- 6.2.1 General
- 6.2.2 Non-steerable techniques [Go to Page]
- 6.2.2.1 General
- 6.2.2.2 Soil displacement techniques
- 6.2.2.3 Soil removal techniques
- 6.2.3 Steerable techniques [Go to Page]
- 6.2.3.1 Microtunnelling
- 6.2.3.2 Pilot pipe jacking
- 6.2.3.3 Directional drilling (also called HDD – Horizontal directional drilling)
- 6.3 Manned techniques [Go to Page]
- 6.3.1 General
- 6.3.2 Non-steerable techniques
- 6.3.3 Steerable techniques [Go to Page]
- 6.3.3.1 General
- 6.3.3.2 Shield (open) with partial working face excavation, with or without supporting slope, with or without mechanical support
- 6.3.3.3 Shield (open) with partial working face excavation, with or without supporting slope, with or without mechanical support under compressed air
- 6.3.3.4 Shield (open) with cutting wheel, with or without mechanical support, under or not under compressed air
- 6.3.3.5 Shield (closed) with full face excavation and fluid support and compressed air (Mixshield)
- 6.3.3.6 Shield (closed) with full face excavation and earth pressure balance (EPB shield)
- 6.3.4 Other manned techniques [Go to Page]
- 6.3.4.1 General
- 6.3.4.2 Heading
- 7 Requirements of planning and construction [Go to Page]
- 7.1 General
- 7.2 Basic evaluation, design and construction planning [Go to Page]
- 7.2.1 General
- 7.2.2 Survey of existing structures and systems
- 7.2.3 Ground and groundwater
- 7.2.4 Minimum clear dimensions
- 7.2.5 Subsidence, heaves, cover
- 7.2.6 Layout of the line
- 7.2.7 Tolerances
- 7.2.8 Starting, intermediate and target pits
- 7.2.9 Working face support
- 7.2.10 Additional measures in water bearing ground
- 7.2.11 Obstacles
- 7.2.12 Soil conditioning
- 7.2.13 Structural calculation
- 7.2.14 Construction site arrangement
- 7.3 Work preparation and construction [Go to Page]
- 7.3.1 General
- 7.3.2 Starting, intermediate and target pits
- 7.3.3 Exit and entry processes
- 7.3.4 Static calculation of launch and reception shafts
- 7.3.5 Overcut
- 7.3.6 Recording and logging of jacking parameters
- 7.3.7 Support of the working face
- 7.3.8 Lubricant and supporting medium
- 7.4 Avoidance of damage
- 8 Inspection and testing of pipelines after installation [Go to Page]
- 8.1 General
- 8.2 Visual inspection
- 8.3 Leaktightness
- 9 Qualifications
- Annex A (informative)Additional information about the different systems
- Annex B (informative)Guide to typical ranges of application regarding diameters and lengths in suitable soil
- Annex C (informative)Guide to typical ranges of application for selected trenchless techniques regarding diameters and lengths in suitable soils
- Annex D (informative)Trenchless insertion using a pipe plough system [Go to Page]
