Micropiling

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Micropiling

The micropiling technique used by SYCONS Ltd. can be applied to vertically or near-vertically built rigid-core drilled-grouted soil anchors (e.g. ISCHEBECK, GSI, DSI anchor systems), or subsequently injected, drilled micropiles with steel tube cores for foundation reinforcement.

Drilled/grouted soil anchors applied as micropiles are drilled and pre-grouted in the same stage.

These systems require sacrificial drill heads, specifically chosen to meet the actual type of soil and drilling requirements. Drill rods are screw-threaded reinforcing rods that remain in the soil, with internal longitudinal holes for grouting. They can be lengthened using threaded fastening units (couplers). Cement slurry with high water-cement ratio is used as flushing fluid that supports the drill hole and removes excess material. Thin cement can also seep into pores, hardening the surroundings of the borehole.

The outer load-bearing and anti-corrosion cement shell is made during „finisher-grouting”; the grouting of a high-density (low water-cement ratio), cement-based liquid at high pressure.

Grouted soil anchors – when used as micropiles - can also be drilled through the reinforced concrete base or foundation structures using specialised drill-heads, this way easily ensures perfect load transfer ability between foundation and micropile, without any risk of corrosion.

As the first step of construction of injected micropiles with steel tube cores a borehole is drilled, with a diameter corresponding to the planned outside diameter of the pile, using weak cement-slurry for supporting its wall. After that, the perforated steel tube, functioning as the pile’s core rod is lowered into the borehole. The „finisher-grouting” of high-density cement slurry at high pressure is conducted after the wall of the cement-soaked borehole begins to solidify.

We have at our disposal special equipment for checking the load-bearing capacity of finished micropiles.