METHOD FOR PRODUCING A FOUNDATION ELEMENT IN THE GROUND AND FOUNDATION ELEMENT

Abstract

The invention relates to a method for producing a foundation element in the ground, in which a hole is produced in the ground and a hardenable mass is introduced into the hole, which hardens to form the foundation element. According to the invention provision is made in that an insert body is inserted approximately centrally into the hole, the insert body being spaced apart from a circumferential wall of the hole, wherein a ring-shaped intermediate space is formed between the circumferential wall of the hole and the insert body, and in that a hardenable mass is introduced into the ring-shaped intermediate space, which hardens to form a ring-shaped foundation element.

Claims

1.-13. (canceled)

14. The method for producing a foundation element in the ground, in which a hole is produced in the ground and a hardenable mass is introduced into the hole, which hardens to the foundation element, wherein an insert body is inserted approximately centrally into the hole, the insert body being spaced apart from a circumferential wall of the hole, wherein a ring-shaped intermediate space is formed between the circumferential wall of the hole and the insert body, and wherein the hardenable mass is introduced into the ring-shaped intermediate space, which hardens to form a ring-shaped foundation element, wherein the insert body is surrounded on its outer side by a sheathing element and after hardening of the mass to the ring-shaped foundation element the insert body is withdrawn from the foundation element, wherein the sheathing element remains on the ring-shaped foundation element.

15. A method according to claim 14, wherein the insert body is of tubular design.

16. A method according to claim 14, wherein prior to the hardening of the mass one or several reinforcement elements are inserted into the ring-shaped intermediate space.

17. A method according to claim 14, wherein the ring-shaped foundation element is designed to absorb a desired foundation load.

18. A method according to claim 14, wherein the insert body is constructed of ring-shaped segments.

19. A method according to claim 14, wherein a central cavity is surrounded by the ring-shaped foundation element.

20. A method according to claim 19, wherein during the production of the hole ground material is removed and conveyed as excavated material out of the hole and at least a part of the excavated material is returned into the central cavity of the ring-shaped foundation element.

21. A method according to claim 14, wherein the hole is produced through drilling with a circular cross-section or through cutting with an angular cross-section.

22. A method according to claim 20, wherein the ground material is mixed with a concrete mass.

23. The foundation element produced pursuant to a method according to claim 14, wherein the foundation element is produced in a ring-shaped manner from a hardenable mass in the ground, wherein the sheathing element remains on the ring-shaped foundation element.

24. A foundation element according to claim 23, wherein a central cavity is designed in the ring-shaped foundation element.

25. A foundation element according to claim 24, wherein the central cavity in the ring-shaped foundation element is filled with a non-hardenable material, in particular removed ground material.

Description

[0025] The invention is described further by way of a preferred, exemplary embodiment illustrated schematically in the accompanying drawings, wherein show:

[0026] FIG. 1 a cross-sectional view during the production of a foundation element according to the invention with inserted insert body; and

[0027] FIG. 2 a cross-sectional view of the foundation element of FIG. 1 after removal of the insert body.

[0028] To produce a foundation element 10 according to the invention in a ground 5 a hole 7 is initially introduced into the ground 5. The production of the hole 7 can take place in a conventional way e.g. through drilling or cutting. The drilling concerned can be cased or uncased drilling.

[0029] Before introduction of a hardenable mass into the hole 7 an insert body 20 is inserted into a central region of the hole 7. The insert body 20 can be inserted as early as during the sinking of the hole 7 or only on completion of the hole 7. In the illustrated embodiment the insert body 20 is constructed of three ring-shaped segments 22 in total which are axially connected to each other.

[0030] The insert body 20 is inserted approximately centrally into the hole 7 such that a defined distance is formed between an outer side of the insert body 20 and a circumferential wall 8 of the hole 7. In this way, an intermediate space is created which is filled with a hardenable mass to form the ring-shaped foundation element 10.

[0031] In the illustrated embodiment the insert body 20 is placed onto a bottom 14 of the hole 7. On its outer side the insert body 20 has a sheathing body 24 that can be a film or a fabric for example. The sheathing body 24 can be a lost element which mainly serves to prevent direct adhesion of the hardenable mass to the insert body 20. The sheathing body 24 can be open or closed at its lower end.

[0032] After hardening of the hardenable mass to form the ring-shaped foundation element 10 the insert body 20 is pulled upwards out of the hole 7 so that a central cavity 12 is formed in the ring-shaped foundation element 10, as illustrated graphically in FIG. 2. The sheathing body 24 remains on the inner side of the ring-shaped foundation element 10 and can, for example, serve to additionally seal the central cavity 12 with respect to the ring-shaped foundation element 10.

[0033] According to an embodiment of the invention a material of the ground that arises as excavation material 30 during the production of the hole 7 can be introduced into the central cavity 12. This reduces the amount of excavated material 30 that has to be transported away from the construction site and deposited. At the same time, in the illustrated embodiment the excavated material 30 serves for the stabilization and inner support of the ring-shaped foundation element 10. The ability of the latter to transfer structural loads into the ground 5 is accomplished to a decisive degree through the skin friction of the outer side of the foundation element 10 with the circumferential wall 8 of the hole 7.