Microdrilling for Geotechnical Applications | Casagrande Group

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Microdrilling

Microdrilling

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Ground improvement

Ground improvement

Microdrilling

Precision drilling solutions for ground reinforcement, stabilisation and special foundations.
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Overview

Microdrilling includes a range of high-precision drilling techniques used to reinforce and stabilise soil and rock in confined or complex environments.
These solutions are widely applied for structural reinforcement, slope stabilisation, underpinning, excavation support and groundwater control.
Typical applications include anchors, micropiles, jet grouting and soil nails.
Microdrilling methods allow accurate installation with low vibration, reduced noise and limited spoil, making them ideal for urban areas, refurbishment projects and sites with restricted access.

Available technologies

Anchors

Anchors

Ground anchors are tensile elements installed in soil or rock to transfer loads from structures to stable ground. They are commonly used for retaining walls, excavations, slopes and uplift resistance. Anchors are installed by drilling, placing steel tendons or bars, grouting and tensioning. They provide high load capacity, precise force control and long-term stability, even in challenging geotechnical conditions.
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Jet grouting

Jet grouting

Jet grouting improves soil properties by injecting high-pressure cement grout through rotating drill rods, creating soil-cement columns or panels. This technique increases strength, reduces permeability and allows treatment of weak or heterogeneous soils. Jet grouting is highly versatile and can be applied for underpinning, cut-off walls, bottom plugs and excavation support.
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Micropiles

Micropiles

Micropiles are small-diameter drilled and grouted piles used for foundation reinforcement and load transfer. They are suitable for both compression and tension loads and can be installed in a wide range of soils and rock. Micropiles are particularly effective for underpinning existing structures, seismic retrofitting and construction in low headroom or restricted-access sites.
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Soil nailing

Soil nailing

Soil nailing is a reinforcement technique in which steel bars are installed in drilled holes and grouted to stabilise slopes and excavations. The nails work in tension to create a reinforced soil mass, often combined with shotcrete facing. Soil nails offer rapid installation, minimal excavation and effective stabilisation in temporary and permanent works.
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Comparison table

TechnologyIdeal soil typeMax. depthVibrationsResulting materialIdeal for
Anchors Soil and rock with adequate bond capacity Variable, project-specific Very low Grouted steel tendons or bars Retaining walls, uplift resistance, slope stabilisation
Jet grouting Soft soils, sands, silts, heterogeneous ground Up to ~30 m (typical) Very low Soil-cement columns or panels Soil improvement, cut-off walls, excavation support
Micropiles Almost all soil types and rock Up to ~40 m (typical) Very low Steel-reinforced grouted piles Underpinning, seismic retrofit, special foundations
Soil nails Cohesive or lightly cemented soils Up to ~20 m (typical) Very low Grouted steel bars with facing Slope stabilisation, temporary and permanent excavations

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