Micropiles

15,800 Installed Micropiles, 125 Completed Projects

A micropile is a small diameter (305mm or less) friction pile that is bored or drilled and can be installed at an angle to accommodate axial and lateral loads. Micropiles may be cased or uncased depending on soil conditions and application. Once installed, central reinforcement bar and cementitious grout allow for load transfer into the bearing soil or rock. Load carrying capabilities depend on the quality of the bond between the central reinforcement, grout and the type of soil/rock.

INSTALLATION

Common installation methods for Micropiles include down-the-hole hammer (DTH), and rotary-percussion (top hammer). Soil type, rock conditions and application determine the method of drilling that will be used. They can be installed in soil, rock, cobbles and boulders, through man-made obstructions or in areas with high water tables to depths in excess of 60 metres (200 ft.)

ADVANTAGES OF MICROPILES:

  • Capacity 1000kN-3000kN SLS Load
  • Ability to install in tight access installations (5ft wide) and low headroom (8ft high)
  • Limited or no spoils/vibrations
  • No dewatering required - can be installed in a high water table application
  • Obstructions in soil (boulders, rubble, etc.)
  • Resist tension, compression and lateral loads
  • Small displacement at load
  • Installed in areas with sloped rock where other traditional deep foundation methods do not perform well
  • Similar installation methods for all ground conditions
  • Simultaneous drill and grout Installation

Applications: