Micropiles are defined as bored piles with diameters not exceeding 250mm. Micropiles were first constructed in Italy in 1950s and were given the name “root piles”.
Whenever bored piles (larger diameter) and driven piles are considered feasible, they should be more economic than micropiles. Owing to the small size of piles, only small dimension of equipment is needed for construction. Moreover, it can be used to drill through any type of soils, boulders and hard materials.
Micropiles have extensive applications under the following situations:
(i) Underpinning and retrofitting existing structures;
(ii) Locations of limited vertical clearance and small working areas.
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This question is taken from book named – A Self Learning Manual – Mastering Different Fields of Civil Engineering Works (VC-Q-A-Method) by Vincent T. H. CHU.
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