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Micropiles are small diameter cast-in-place, reinforced piles which are drilled into the ground. Micropiles are the ideal solution in areas with limited access and low overhead clearances where conventional piling rigs cannot operate. Micropiles can be designed to carry high loads depending on the soil and rock conditions. Allowable design loads typically vary from 20 to 200 tons and higher in capacity.

They can be installed in a wide range of soils, from non-cohesive, poorly graded granular soils, to cohesive plastic clays to depths of 100 feet or more. In competent bedrock conditions, load capacity can easily reach 250 to 350 tons. Micropiles typically consist of a core steel element surrounded by a neat cement grout mixture. They are a viable, practical solution to transferring high-capacity loads to more stable, competent subsurface strata. After drilling to the required depth, the holes are filled with a high strength grout. The steel casing may be left in place or removed and replaced with a high strength steel bar. Micropiles are installed using water flush rotary drilling or rotary percussion techniques.

Applications include:

  • Structural Foundation Support
  • Structural Underpinning
  • Soil and Slope Stabilization

Key advantages of micropiles include:

  1. They have a small diameter range from 5” to 12”.
  2. They cause minimal disturbance / vibration to adjacent structures during the installation.
  3. With suitable ground conditions, they can be installed cost effectively, with high load capacities.
  4. They can be installed in areas presenting difficult access and/or overhead clearance.
  5. They can be structurally incorporated into existing foundation systems.

Sinodrills' self drilling anchors can be installed as micropiles, which performs drilling, anchoring and grouting in a single operation, no need to remove and insert casing tube, fastly save time and money.