There are four basic methods of installing micropiles:
Inserting the steel member after drilling and tremie or gravity grouting
Post grouting using multiple stage pvc exploders
Grouting during drilling using continuous threaded hollow-bar and a drill bit with grout holes.
Grouting through the casing
Micropiles can be installed in limited access and headroom conditions
Micropiles can be installed with minimum disturbance to adjacent structures with the appropriate installation methodology
Micropiles can be installed through existing foundations and are ideally suited to under-pinning and as load enhancement of existing foundations
Not required for pre-drilling
Due to the high capacity steel reinforcing elements, micropiles have high uplift load capacity and can be effectively used for tension structures
Due to the wide range of installation methods available and the relevant ease of penetrating boulders or hard rock formations, micropiles can be installed in difficult ground conditions.
Where to use the System Micropile Applications?
Deep Foundation repair.
Foundation rehabilitation and repairs.
Stabilization of foundation on adjacent structure
Micropiles are used for the development of bridges, towers, and buildings.
What are the types of Micropiles?
- Hollow Bar
- Usually used for collapsible soils, it increases the bond stress of the soil.
- Hollow Bar
- Helical Pulldown
- Usually used for deep foundations and with higher capacity structure load, used it friction and bearing to support structure’s foundation.
- Cased Micropiles