Jet grouting method

Safe sealing of excavation pits and stabilisation of the soil

We use the jet grouting method, for example, to create tight excavation shoring, seal excavation floors or underpin the foundations of existing buildings. In this process, the soil structure is broken up by a high-energy liquid/suspension jet. At the same time, the fine particles of the soil are removed, mixed or supplemented with cement and thus solidified.

Implementation

A special drill string is sunk to the bottom of the borehole using uncased rotary drilling and drilling fluid. During retraction, the in-situ soil is cut open with the rotating cutting jet (horizontal water and/or suspension jet with or without the addition of air) and simultaneously mixed with the cement suspension.

Examinations

Test columns
Temperature measurements in the centre of the column to determine the diameter and cement content of the column
Determination of the diameter by geophysical measurement on gauging rods

Applications

Building underpinning and foundation renovation
Excavation support
Deep foundations and foundation reinforcements
Sealing elements (dam seals, columns or louvre walls, joint seals)
Sealed floors and groundwater passages

Technical data

Drilling depths	up to 40 m
Diameter	80 to 300 cm (depending on soil conditions)
Cutting pressure	300 to 600 bar
Compressive strength	2 bis 10 N/mm² (usual values depending on soil conditions)
Permeability	10^7 to 10^9 m/s
Portable carriage	0.25 t, tracked drilling rig 30 t