NEN EN 14199 : 2015

Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Information needed for the execution of the works
   4.1 General
   4.2 Special features for micropiles:
   4.3 List of activities
5 Geotechnical investigation
   5.1 General
   5.2 Specific requirements
6 Materials and products
   6.1 General
   6.2 Reinforcement and load bearing elements
        6.2.1 Steel for reinforcement cage elements
        6.2.2 Steel for load bearing elements
        6.2.3 Other materials for reinforcement and load
              bearing elements
   6.3 Materials for grout, mortar and concrete
        6.3.1 Cement
        6.3.2 Aggregates
        6.3.3 Water
        6.3.4 Additions and admixtures
   6.4 Cement grout
        6.4.8 Quality control
   6.5 Mortar and Concrete
        6.5.1 Mortar and concrete in situ
        6.5.2 Other concrete
   6.6 Spacers, centralizers and other components
   6.7 Coatings and corrosion protection compounds
7 Considerations related to design
   7.1 General
   7.2 Geometrical construction tolerances
   7.3 Installation
   7.4 Reinforcement
   7.5 Connecting elements
   7.6 Corrosion protection of steel elements
   7.7 Spacers and centralizers
   7.8 Micropile enlargement
   7.9 Connections to the superstructure
   7.10 Spacing of micropiles
   7.11 Special requirements for micropiles installed through
        very weak soils
   7.12 Micropile shoe
8 Execution
   8.1 General
   8.2 Site preparation
   8.3 Sequence of installation
   8.4 Drilling
        8.4.1 General
        8.4.2 Use of flushing
        8.4.3 Boreholes supported by casings
        8.4.4 Drilling with continuous flight augers
   8.5 Driving
   8.6 Enlargements
   8.7 Reinforcement and load bearing elements
        8.7.1 Handling and storing
        8.7.2 Joints
        8.7.3 Spacers and centralizers
        8.7.4 Installation
   8.8 Grouting
        8.8.1 General
        8.8.2 Grout preparation
        8.8.3 Borehole testing and pregrouting
        8.8.4 Filling the borehole with grout
        8.8.5 Single step grouting through a temporary casing
        8.8.6 Single step grouting through a load bearing element
        8.8.7 Grouting and filling during driving
        8.8.8 Grouting during drilling
        8.8.9 Multi-stage grouting
   8.9 Concreting
   8.10 Trimming of micropiles
9 Supervision, testing and monitoring
   9.1 Supervision
   9.2 Monitoring of micropile construction
   9.3 Micropile testing
        9.3.1 General
        9.3.2 Static load tests
        9.3.3 Dynamic load tests and integrity tests
10 Records
   10.1 General
   10.2 Records for the execution of construction micropiles
   10.3 Records for micropile tests
11 Special requirements
Annex A (informative) Execution methods of micropiles
      A.1 Drilled micropiles
      A.2 Displacement micropiles
Annex B (informative) Guidance on geometrical construction
        tolerances
Annex C (informative) Minimum cover (in mm) for reinforcement
        and bearing element of low strength steel for cast in
        place micropiles taking into account exposure classes
        related to environmental actions as defined in EN 206-1
Annex D (informative) Guidance on corrosion rates
Annex E (informative) Borehole testing and pregrouting
Annex F (informative) Guideline for the preparation of a record
        for several drilled micropiles
Annex G (informative) Guideline for the preparation of a record
        for several driven micropiles
Bibliography

Presents general principles for the execution of micropiles.