Civil Engineering Association

EN 14199:2005 Execution of special geotechnical works - Micropiles

1.1 This document establishes general principles for the execution of micropiles.
They are for:
- drilled micropiles a shaft diameter not greater than 300 mm;
- driven micropiles a shaft diameter or a maximum shaft cross sectional extension not greater than 150 mm.
1.2 Micropiles are structural members to transfer actions to the ground and may contain bearing elements to transfer directly or indirectly loads and or to limit deformations. Their shaft and base resistance may be improved (mostly by grouting) and they may be constructed with (see Figure 1):
- uniform cross section (straight shaft); or
- telescopically changing shaft dimensions;
- shaft enlargements; and/or
- base enlargement.
1.3 Other than practical considerations, there are no limitations regarding, length, rake (definition of rake, see Figure 2), slenderness ratio or shaft and base enlargements.
1.4 The provisions of the document apply to (see Figure 3):
- single micropiles;
- micropile groups;
- reticulated micropiles;
- micropile walls.
1.5 The micropiles which are the subject of this document can be installed into the ground using drilling, driving or a combination of these methods.
1.6 The material of micropiles covered by this document can be:
- steel or other reinforcement materials;
- grout, mortar or concrete;
- a combination of above.
1.7 Micropiles may be used for:
- working under restricted access and/or headroom conditions;
- foundations of new structures (particularly in very heterogeneous soil or rock formations);
- reinforcing or strengthening of existing structures to increase the capacity to transfer load to depth with acceptable load settlement characteristics, e.g. underpinning works;
- reducing settlements and/or displacements;
- forming a retaining wall;
- reinforcing of soil to form a bearing and/or retaining structure;
- improving slope stability;
- securing against uplift;
- other applications where micropile techniques are appropriate.
1.8 Mixed-in-place columns and timber piles are not included in this document. Columns constructed by jet grouting are covered by EN 12716. Ground anchors are covered by EN 1537.

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BS EN 14199:2015 Execution of special geotechnical works — Micropiles

[Image: 03488398553173753538.jpg]

[*]Author(s): CEN/TC 288 “Execution of special geotechnical works”
[*]Published By: CEN
[*]Published Year: 2015
[*]Size: 1.49 MB
[*]Quality: Original preprint

[*]Abstract: 1.1 This European Standard establishes general principles for the execution of micropiles.
They are for drilled piles constructed using a drilling tool with a diameter less than 300 mm.
NOTE 1 This European Standard is not applicable to driven piles, the execution of which is governed by EN 12699.
NOTE 2 For a definition of shaft diameter see 3.3.
1.2 Micropiles are structural members to transfer actions to the ground and can contain bearing elements to
transfer directly or indirectly loads and or to limit deformations. For examples of micropiles see Figure 1,
Figure 2 and Figure 3. Their shaft and base resistance can be improved (mostly by grouting) and they can be
constructed with (see Figure 4):
— uniform cross section (straight shaft); or
— telescopically changing shaft dimensions;
— shaft enlargements; and/or
— base enlargement.
1.3 Other than practical considerations, there are no limitations regarding, length, inclination (definition of
inclination, see Figure 5), slenderness ratio or shaft and base enlargements.
1.4 The provisions of this European Standard apply to (see Figure 6):
— single micropiles;
— micropile groups;
— reticulated micropiles;
— micropile walls.
1.5 The material of micropiles covered by this European Standard can be:
— steel or other reinforcement materials;
— grout, mortar or concrete;
— a combination of above.
1.6 Micropiles can be used for:
— working under restricted access and/or headroom conditions;
— foundations of new structures (particularly in very heterogeneous soil or rock formations);
— reinforcing or strengthening of existing structures to increase the capacity to transfer load to depth with
acceptable load settlement characteristics, e.g. underpinning works;
— reducing settlements and/or displacements;
— forming a retaining wall;
— reinforcing of soil to form a bearing and/or retaining structure;
— improving slope stability;
— securing against uplift;
— other applications where micropile techniques are appropriate.
1.7 Deep mixing columns according to EN 14679 are not included in this European Standard. Columns
constructed by jet grouting are covered by EN 12716. Ground anchors are covered by EN 1537.
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