Step 1
Site Investigation & Mix Design
Soil sampling, laboratory testing, and trial panels to establish the right binder type, dosage, and injection parameters before committing to full-scale works.
Solutions
Specialist Grouting
High-pressure injection, deep soil mixing, and mass stabilisation — ground improvement from the inside out.
SPECIALIST GROUTING
New Zealand's soft ground, liquefiable soils, and aging infrastructure create persistent demand for specialist grouting. Whether the challenge is improving bearing capacity beneath an existing structure, cutting off groundwater through an embankment, or filling voids beneath a road slab, GSI NZ's in-house grouting capability delivers engineered solutions without excavation or structural disruption.
Our Soilmec SM-3 jet grout rig and purpose-built deep mixing equipment operate across the full range of ground improvement applications — from infrastructure foundations to contaminated ground treatment.
THE GSI DIFFERENCE
PRECISION GROUND
IMPROVEMENT.
- —01ENGINEERING-LED DELIVERYThe same geotechnical engineers who design your ground improvement solution supervise installation — ensuring mix design, column geometry, and quality control match the specification.
- —02RESTRICTED-ACCESS CAPABILITYOur Soilmec SM-3 jet grout rig and FD45 CFA rig are configured for restricted access and low-headroom environments — ground improvement without structural disruption.
- —03PROVEN ACROSS THE SPECTRUMGSI NZ has delivered specialist grouting on projects ranging from emergency road repairs to complex urban underpinning — the full spectrum of ground improvement demand.
HOW WE APPROACH SPECIALIST GROUTING
Step 2
Precision Injection
Controlled injection using calibrated rigs with real-time monitoring of pressure, flow, and volume — ensuring columns or panels are installed to specification.
Step 3
Verification & Reporting
Core sampling, load testing, or permeability testing to confirm ground improvement outcomes — with full documentation for consent requirements.
SPECIALIST GROUTING SERVICES
GSI NZ delivers the full range of specialist grouting and ground improvement technologies:
In-Situ Mass Stabilisation
Binder-stabilised weak or contaminated soils treated in place using high-output mixing equipment.
Deep Soil Mixing
Continuous auger mixing to create stiff soil-cement columns or panels for bearing capacity and groundwater control.
Jet Grouting
High-pressure fluid jets create soilcrete columns beneath existing structures without excavation or vibration.
Foamed Concrete
Lightweight flowable fill for void filling, pipeline abandonment, and annular grouting in confined spaces.
Polyurethane Grouting
Rapid-expanding resin for void filling and slab lifting — trafficable same day in most applications.
EQUIPMENT
PURPOSE-BUILT FOR GROUND IMPROVEMENT
Most geotechnical contractors rent grouting equipment and sub-contract specialist operators. GSI NZ owns its Soilmec SM-3 jet grout rig, high-output mass stabilisation equipment, and the FD45 CFA rig — all operated by our own trained crews.
When a project requires emergency ground improvement under an active road or a constrained urban site, we mobilise our own gear on our own schedule.
5
Specialist rigs
24/7
Mobilisation
100%
Design + build
FREQUENTLY ASKED QUESTIONS
Get in Touch
Grouting Expertise
On Call.
Polyurethane, foamed concrete, jet grouting, or permeation grouting — our specialists will recommend the right technique for your ground conditions.
Discuss Your Project