METHOD AND ARRANGEMENT FOR PRODUCING A FOUNDATION ELEMENT IN THE GROUND

Abstract

The invention relates to a method and an arrangement for producing a foundation element in the ground using a jet grouting device, wherein a jet grouting rod of the jet grouting device is introduced into the ground and a hardenable suspension is injected under pressure into the surrounding ground, wherein the foundation element is produced in the ground, and spaced apart from a place of introduction of the jet grouting rod at least one elongate measuring element is introduced into the ground, with which measurement values are detected when producing the foundation element by the jet grouting device. According to the invention provision is made in that as measuring element a deformable hose is used which is filled with a measuring liquid, and in that as measurement values changes of state of the measuring liquid, in particular a pressure and/or a filling level, are detected in the hose.

Claims

1.-11. (canceled)

12. A method for producing a foundation element in the ground using a jet device, wherein a jet grouting rod of the jet device is introduced into the ground and a hardenable suspension is injected under pressure into the surrounding ground, wherein the foundation element is produced in the ground, and spaced apart from a place of introduction of the jet grouting rod at least one elongate measuring element is introduced into the ground, with which measurement values are detected when producing the foundation element by the jet grouting device, wherein as measuring element a deformable hose is used, wherein the deformable hose is filled with a measuring liquid, as measurement values changes of state of the measuring liquid, in particular a pressure and/or a filling level in the hose, are detected, and at an upper end of the hose a measuring means is arranged, by which at least one change of state of the measuring liquid is detected.

13. The method according to claim 12, wherein the hose is introduced into the ground approximately parallel to the foundation element to be produced.

14. The method according to claim 12, wherein initially a bore to introduce the hose is produced in the ground and in that subsequently the foundation element is produced.

15. The method according to claim 12, wherein the distance between the hose and the jet grouting rod is chosen such that the foundation element reaches close up to the hose.

16. The method according to claim 12, wherein the jet grouting rod of the jet grouting device is rotated and displaced vertically to produce a pile-shaped foundation element.

17. The method according to claim 12, wherein the hose is unwound from a hose drum and introduced into the ground and subsequently the hose is filled under pressure with the measuring liquid.

18. The method according to claim 12, wherein a measuring means comprising a pressure sensor and/or a filling level sensor is used.

19. An arrangement for producing a foundation element in the ground, in particular for carrying out a method according to claim 12, with a jet grouting device having a jet grouting rod with which, by injecting a suspension into the ground, the foundation element can be produced in the ground, and spaced apart from a place of introduction of the jet grouting rod at least one elongate measuring element is introduced into the ground, with which measurement values can be detected when producing the foundation element by the jet grouting device, wherein as measuring element a deformable hose is used, wherein the deformable hose is filled with a measuring liquid, a measuring means is provided, with which changes of state of the measuring liquid, in particular a pressure and/or a filling level in the hose, can be detected, and at an upper end of the hose a measuring means is arranged, by which at least one change of state of the measuring liquid is detected.

20. The arrangement according to claim 19, wherein the measuring means is connected to a computer unit in which the detected measurement values are stored and/or can be analyzed.

21. The arrangement according to claim 19, wherein the measuring means and/or the computer unit is connected to a control means for controlling the jet grouting device.

Description

[0023] The invention is described further hereinafter by way of a preferred exemplary embodiment illustrated schematically in the drawing.

[0024] In the single FIGURE a generally known jet grouting device 10 with a preferably mobile carrier implement 12 is illustrated schematically. On the carrier implement 12 a jet grouting rod 14 is supported such that it can be displaced vertically and introduced into ground 5. The jet grouting rod 14 can, in particular comprise a drilling means and be driven in a rotating manner in order to be drilled down into the ground 5.

[0025] In a lower end region of the jet grouting rod 14 one or several nozzles 16 are arranged. From the nozzle 16 a hardenable suspension 20 can be injected under predetermined pressure into the surrounding ground 5 to form a foundation element. The hardenable suspension 20 can loosen surrounding ground 5 or penetrate into a loose ground formation in order that in the region of the injected suspension 20 a foundation element is formed in the ground 5 after hardening.

[0026] According to the invention a measuring element 30 is introduced approximately parallel to and at a distance A to the jet grouting rod 14 introduced into the ground 5. In the illustrated exemplary embodiment the distance A is chosen slightly smaller than a radial range of the rotating jet stream of suspension 20 from the nozzle 16.

[0027] The elongate measuring element 30 comprises a flexible or elastic hose 32 that is filled with a measuring liquid 34. A lower end 36 of the hose 32 is closed and can be designed with a penetration tip for easier penetration of the hose 32 into an introduction bore in the ground 5.

[0028] At the upper end of the hose 32 a measuring means 40 is arranged which can preferably comprise a pressure sensor for measuring a pressure of the measuring liquid 34 in the hose 32. When the jet stream of suspension 20 from the nozzle 16 that rotates about a vertical axis of rotation of the jet grouting rod 14 passes by or brushes past, a deformation of the flexible hose 32 is brought about. This leads to a pressure increase in the measuring liquid 34 which can be detected with high reliability by the measuring means 40.

[0029] Hence, by the measuring means 40 the passing-by or progressing-past of the rotating jet can be detected reliably. Moreover, based on the level of the pressure detected a statement can be made by way of a non-depicted analysis unit as to the intensity and range of the jet stream. This also allows a corresponding statement to be made as to the foundation element designed in the ground 5. The measuring means 40 can preferably be coupled with a control means of the jet grouting device 10 so that depending on the detected measurement values of the measuring means 40 a control regarding the setting of supply of suspension 20 and of the injection pressure can take place.