Jet grouting
Jet grouting strengthens soil in place — a high-pressure jet of cement suspension creates solid columns in the ground exactly where you need them.
Jet grouting is one of the most versatile ground-improvement technologies. A high-pressure jet of cement slurry breaks up the soil structure and mixes it with the binder, creating a column of soilcrete with a defined strength and diameter — even where a conventional pile cannot reach.
It is used to improve foundation conditions of existing buildings, create underground walls, support excavations, and found new structures in poor geology. A major advantage is its small footprint — we can work from basements and confined spaces.
Key benefits
Underpinning
Strengthening below existing structures without large excavations.
Works in most soils
From gravels to clays — the method handles a wide range of ground.
Confined spaces
Compact rigs allow work from basements and low headroom areas.
Sealing function
Columns can be designed as a cut-off wall against groundwater.
How the work proceeds
- 01
Parameter design
Column diameter, strength and layout based on geology.
- 02
Drilling
Small-diameter borehole to the design depth.
- 03
Jetting
Rotating and slowly withdrawing the rods while jetting forms the column.
- 04
Quality control
Strength and geometry verification with protocols.
Frequently asked questions
How does jet grouting differ from conventional grouting?
Conventional grouting fills soil pores at low pressure; jet grouting actively erodes the soil with a 300–600 bar jet and mixes it with cement, producing a homogeneous column of predictable strength.
Can it be used under an existing house?
Yes — that is one of its main strengths. Boreholes are drilled at an angle from outside or directly from the basement.
How long does it take?
Typical underpinning of a family house takes days up to two weeks depending on scope.
Related services
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