Method and device for treating soil

1. Method for treating soil, comprising:

driving a soil auger, which comprises an outlet opening, into the soil;

injecting a treatment product into the soil via the outlet opening at different depths;

wherein the soil auger comprises a helical drilling blade and the outlet opening is provided in the drilling blade;

measuring an injection pressure and an injection flow rate during the injection;

deriving a soil parameter from the injection flow rate and the injection pressure of the soil at the location where the treatment product is injected; and

adapting the injection pressure as a function of the soil parameter, said soil parameter being a hydraulic conductivity, a measure of the hydraulic conductivity, or a value, a variable, or a parameter which is proportionate to the hydraulic conductivity.

2. Method for treating soil, according to claim 1 , further comprising identifying or locating at least one soil layer using said soil parameter.

3. Method for treating soil, according to claim 1 , characterized in that the injection pressure is adapted in order to obtain an injection flow rate which is above a certain lower limit.

4. Method for treating soil, according to claim 1 , characterized in that the injection pressure is adapted in such a way that it does not exceed a certain maximum value.

5. Method for treating soil, according to claim 1 , characterized in that the treatment product is continuously injected into the soil for at least a part of a movement trajectory of the soil auger in the soil, while the injection pressure and the injection flow rate are measured and while the injection pressure is continuously adapted as a function of said soil parameter of the soil into which the treatment product is injected.

6. Method according to claim 1 , characterized in that the treatment product is continuously or at intervals injected into the soil for at least a part of a movement trajectory of the soil auger, while the injection pressure and the injection flow rate are measured, and further comprising identifying or locating a soil layer present at a number of different depths on the basis of the measurements.

7. Method according to claim 6 , further comprising, for at least one soil layer, determining depths at which a top and a bottom of the soil layer are located on the basis of the measurements.

8. Method according to claim 1 , characterized in that the product is a product with a soil-remediating or soil-stabilizing effect.

9. Method according to claim 1 , further comprising noting and/or storing and/or visualizing the magnitude of the injection pressure and the injection flow rate, and/or the magnitude of said soil parameter derived from the injection pressure and the injection flow rate for a number of different depths, for at least a part of a movement trajectory of the soil auger.

10. Method according to claim 1 , characterized in that the helical drilling blade is provided on the outside of a drilling core which comprises a supply duct for the product, the helical drilling blade comprises at least one injection zone in which the drilling blade is formed by two walls which are at a distance from one another along a longitudinal direction of the drilling core and are separated by an intermediate space, and said outlet opening is formed between outer edges of the two walls.

11. Method for injecting a product into soil, according to claim 10 , characterized in that said injection zone describes an injection angle of at least 15° or at least 180° or at least 360° about an axis of the drilling core.

12. Method for injecting a product into soil, according to claim 10 , characterized in that the drilling core has a tip end and a rear end, the drilling blade has a front end facing the tip end, and the drilling blade has a first zone, where the outer diameter of the drilling blade, from the front end, increases from a first diameter to a second diameter, and the drilling blade comprises a second zone adjoining the first zone, where the outer diameter is the second diameter, and the injection zone of the drilling blade is situated within the second zone.

13. Method for injecting a product into soil, according to claim 12 , characterized in that the drilling blade comprises a third zone adjoining the second zone, where the outer diameter of the drilling blade increases in the direction of the rear end from the second diameter to a third diameter.

14. Method for injecting a product into soil, according to claim 12 , characterized in that, in the injection zone, the drilling blade has a thickness which is greater than a maximum thickness of the drilling blade in the first zone.

15. Method for injecting a product into soil, according to claim 12 , characterized in that, in the third zone, the drilling blade has at least virtually the same thickness as in the second zone.

16. Method for injecting a product into soil according to claim 10 , characterized in that a width of the outlet opening measured along a helical course of the drilling blade is greater than a height of the outlet opening, wherein a ratio between the width and the height of the outlet opening is preferably at least 2 or at least 3 or at least 5 or at least 10 or at least 15.

17. Device for treating soil, comprising:

a drilling rig provided with a soil auger which comprises a supply duct and at least one outlet opening connected to the supply duct, wherein the drilling rig is provided for driving the soil auger into soil,

an injecting device which is provided for injecting a treatment product into the soil via the supply duct and the outlet opening, and

a measurement device which is provided for measuring at least injection pressure and injection flow rate during the injection of the treatment product into the soil,

wherein the soil auger comprises a helical drilling blade in which said outlet opening is provided,

wherein the device comprises a data processing unit which cooperates with the measurement device and is provided for deriving a soil parameter of the soil based on measurement data generated by the measurement device or measurement signals relating to the injection pressure and the injection flow rate which were used during the injection of a quantity of treatment product, and

wherein the device is provided for adapting the injection pressure as a function of said soil parameter, said soil parameter being a hydraulic conductivity, a measure of the hydraulic conductivity, or a value, a variable, or a parameter which is proportionate to the hydraulic conductivity.

18. Device for treating soil according to claim 17 , characterized in that the data processing unit is provided for identifying or locating at least one soil layer on the basis of the measurement data or measurement signals.

19. Device for treating soil according to claim 17 , characterized in that the device is provided for continuously injecting the treatment product into the soil for at least a part of a movement trajectory of the soil auger in the soil, while the injection pressure and the injection flow rate are measured and while the injection pressure is continuously adapted as a function of said soil parameter of the soil into which the treatment product is injected.

20. Device for treating soil according to claim 17 , characterized in that the device is provided for injecting the treatment product into the soil continuously or at intervals for at least a part of a movement trajectory of the soil auger in the soil, while the injection pressure and the injection flow rate are measured, and the device is provided for adapting the injection pressure and/or identifying or locating at least one soil layer on the basis of the measurement data or measurement signals.

21. Device for treating soil, according to claim 17 , characterized in that the soil auger comprises an elongate drilling core, the drilling core comprises a supply duct for the treatment product, the helical drilling blade comprises at least one injection zone in which the drilling blade is formed by two walls which are at a distance from one another along a longitudinal direction of the drilling core and are separated by an intermediate space, and said outlet opening is formed between the outer edges of the two walls.

22. Device for treating soil, according to claim 21 , characterized in that said injection zone describes an injection angle of at least 180° or at least 360° about an axis of the drilling core.

23. Device for treating soil, according to claim 21 , characterized in that the drilling core has a tip end and a rear end, the drilling blade has a front end facing the tip end, and the drilling blade has a first zone, where the outer diameter of the drilling blade, from the front end, increases from a first diameter (D 1 ) to a second diameter (D 2 ), and the drilling blade comprises a second zone (Z 2 ) adjoining the first zone (Z 1 ), where the outer diameter is the second diameter (D 2 ), and the injection zone (IZ) of the drilling blade is situated substantially within the second zone (Z 2 ).

24. Device for treating soil, according to claim 23 , characterized in that the drilling blade comprises a third zone adjoining the second zone, where the outer diameter of the drilling blade) increases in the direction of the rear end from the second diameter to a third diameter.

25. Device for treating soil, according to claim 23 , characterized in that, in the injection zone, the drilling blade has a thickness which is greater than a maximum thickness of the drilling blade in the first zone.

26. Device for treating soil, according to claim 21 , characterized in that, in the third zone, the drilling blade has at least virtually the same thickness as in the second zone.

27. Device for treating soil according to claim 17 , characterized in that a width of the outlet opening measured along a helical course of the drilling blade is greater than a height of the outlet opening, wherein a ratio between the width and the height of the outlet opening is preferably at least 2 or at least 3 or at least 5 or at least 10 or at least 15.

28. Device for treating soil according to claim 17 , characterized in that the drilling core comprises a connector at the rear end for connecting the drilling core to a tube element which extends the soil auger.