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Self drill micro-piles are formed from a fully threaded steel bar with a hollow core which is drilled and simultaneously grouted into soils without a casing typically employing rotary percussive techniques. The technique is suitable for a variety of ground conditions including clay, sands and gravels, made ground and weathered rock. They can be installed through existing footings and base slabs. Applications include micropiling as well as soil nailing, ground anchors and rock bolting. Self drill micro-piles are installed using small scale piling rigs and are particularly suited to axial compression and tension loads and can easily be installed at raking angles. A variety of sacrificial drill bits are available to suit different conditions. As temporary casing is not required the technique is well suited to use in collapsing and problem ground. The method is suitable for a wide range of project types including rail related work and foundation upgrades, stabilisation and underpinning as well as façade retention, tension piles, tie backs, highway and bridge works etc. Advantages
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