Micropiles & Mini-Piles
Foundations and abutments which have become unstable due to erosion, poor compaction or soil movement may be remediated by use of grout filled micropiles to provide structural support. MicroPiles are drilled through unstable compression strata into stable, bearing strata below. The steel members are then filled with high compression strength grout to provide the supporting axial or lateral loadbearing requirements of the structure.
Micropiles are a specific type of pile grouting. Micropiles are soil replacement rather than soil displacement of small diameter piles. Usually, they are drilled and grouted high capacity steel bars acting in compression. Generally 2"-12" in diameter, micropiles are friction rather than end bearing, depending on high adhesion (side friction) to the grouted mass. The bars can be single or multiple corrosion protected.
Micropiles are constructed similar to rock bolts in that an anchor zone is grouted, the bar is tensioned and then fully grouted, locking in pretension and corrosion protection.
• structural support
• foundation augmentation
• earth retention
• building remediation- used as jacking piles
• can be installed in limited and low headroom access
• excellent where drilling is difficult
• requires small drilling equipment
• bars can be cut and coupled in as low as 4 ft. head room
Jensen’s is a certified Pier Tech installer.
Helical piers differ from micropiles in that the structural steel member is a screw anchoring system providing vertical support. This provides a cost effective alternative to micropile and mini-pile pier systems.
Pier Tech Systems offers a technically superior and extremely cost effective alternative to other remedial pier systems. It is backed by almost ninety (90) years of structural engineering experience.
This concept focuses upon screwing steel piers with single and multiple helixes into stable subsoil until the torque applied indicates that the necessary load capacity has been achieved.
Once the necessary load capacity has been accomplished, adjustable brackets are attached to the base of foundation walls where the problem exists. They are then hydraulically jacked and locked into position with the weight of the wall now shifted to the installed piers.
The Pier Tech Helical Pile Systems, barely disturbs the landscape. The average residential structure problems usually are completed in less than two working days. The Pier Tech Helical Pile System is listed with major building codes including I.C.B.O and SBCCI.
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