Micropiles

ABB

Micropiles are small diameter (typically less than 12 inch), drilled and grouted, non-displacement pile that is typically reinforced. Micropiles are typically installed using drilling and grouting methods and are typically reinforced with threaded bar and/or steel casing. Micropiles are very useful where site access, either laterally or overhead is restricted. Micropiles are commonly used to penetrate a layer of material (i.e. soft soils, or debris) that will not provide the necessary support for shallow foundations. Acting primarily in skin friction, micropiles develop high compression and tension capacities. Micropiles can accomodate some lateral and moment loadings, which can be increased with the introduction of casing in the upper portions of the pile. Micropile installation equipment produces very little ground vibration which is an advantage when working adjacent to fragile structures or vibration sensitive equipment. 


Relatively high compressive loads can be achieved. For instance a 5.5" OD steel casing set in grout can achieve allowable compressive loads in the range of 180 kips. A 9-5/8" diameter casing set in grout can achieve allowable compressive loads in the range of 475 kips.

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