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MICROPILE TECHNOLOGY

MICROPILE TECHNOLOGY

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Micropile technology is recently in great demand as it allows solving of most of the issues related to geotechnical construction under cramped conditions; this is a great advantage when working on hard to reach areas.

Micropiles can be used in construction of pile foundations in new buildings and structures or shoring of foundations in already constructed buildings and structures during their repair or reconstruction.

During the construction under cramped urban conditions using micropiles, vertical geotechnical screens (decoupling diaphragms) are installed into separate foundations between the existing and newly constructed buildings in order to minimize negative impact of new construction on the existing building.

When combined with ground anchors, micropiles are widely used in construction of supporting walls or shoring of excavations. Micropiles may be also useful in taking antilandslide measures to install supporting walls, or as a dowel (inclined piles) to increase slope stability.

The decision on using micropiles is taken on the basis of engineering and geological conditions, applied load, and work conditions. In practice, micropile diameter ranges from 150mm to 325mm, and their length is up to 25m. In accordance with micropile functional assignment, it may be reinforced by a single reinforcing bar, reinforcement cages or rigid reinforcement by rolled sections. Micropile shaft is filled by grout injection, at the same time, cement brick strength of 250 ... 300 kg/cm is easily achieved. Micropiles can be manufactured using a supporting injection pipe with cuffs that allows additional injection of cement mortar to achieve high bearing capacity of micropiles on the ground or in their installation under severe engineering and geological conditions.

In comparison with other methods of foundation shoring, the advantages of micropiles are speed, reliability and environmental safety during manufacturing.