Method for generating a freeroom for a mast element

Abstract

A method is for generating a freeroom for a mast element in a ground. The method includes the steps: a) drilling a first annular recess into the ground, the first recess having: a first diameter; and a first depth; b) drilling a second annular recess in the ground, the second recess being arranged to receive the mast element, and the second recess: having a diameter which is smaller than the first diameter; having a second depth which is larger than the first depth; surrounding a first core of the ground; and being surrounded by the first recess; wherein there is, defined between the first recess and the second recess, a second core which can be removed to generate a freeroom.

Claims

1. A method for generating a freeroom for a hollow mast element in a ground, the method comprising: a) drilling a first annular recess into the ground using a drill rig having a first slot drill mounted thereto, the first slot drill being replaceable and having a first diameter, the first annular recess having the first diameter and a first depth; and b) drilling a second annular recess into the ground using the drill rig having a second slot drill mounted thereto instead of the first slot drill, the second slot drill being replaceable and having a second diameter smaller than the first diameter, the second annular recess having the second diameter and a second depth and surrounding a first core of the ground, wherein after drilling the first annular recess and the second annular recess the second depth which is larger than the first depth, the second annular recess is located within the first annular recess, and a second core of the ground is defined between the first annular recess and the second annular recess, and wherein the second annular recess is arranged to receive the hollow mast element with the hollow mast element surrounding the first core of the ground and being surrounded by the first annular recess; and c) generating the freeroom by removing the second core.

2. The method according to claim 1, wherein step b) is performed before step a).

3. The method according to claim 1, wherein the method further includes the step d) removing a portion of the first core.

4. The method according to claim 1, wherein the method includes step e) deepening the second annular recess to a third depth, the second annular recess surrounding a third core at the third depth.

5. The method according to claim 4, wherein the step e) is performed after step b) and step d).

6. The method according to claim 1, wherein the method further comprises, before step a), step d) positioning and securing the drill rig to the ground.

7. The method according to claim 6, wherein the drill rig is pivotably secured to the ground.

8. The method according to claim 2, wherein the method includes step d) removing a portion of the first core.

9. The method according to claim 2, wherein the method includes step d) deepening the second annular recess to a third depth, the second annular recess surrounding a third core at the third depth.

10. The method according to claim 3, wherein the method includes step e) deepening the second annular recess to a third depth, the second annular recess surrounding a third core at the third depth.

11. A method for generating a freeroom for a hollow mast element in a ground, the method comprising: drilling a first annular recess into the ground, the first annular recess having a first diameter and a first depth; drilling a second annular recess into the ground, the second annular recess having a second diameter and a second depth, wherein after drilling the first annular recess and the second annular recess the second depth is greater than the first depth and the second diameter is less than the first diameter, wherein a first core of the ground is surrounded by the second annular recess and a second core of the ground is defined between the first annular recess and the second annular recess, and wherein the second annular recess is arranged to receive the hollow mast element such that the hollow mast element surrounds the first core; and generating the freeroom by removing the second core.

12. The method according to claim 11, further comprising positioning the hollow mast element in the second annular recess, wherein the hollow mast element is surrounded by the ground at the second depth.

13. The method according to claim 12, wherein after the hollow mast element is positioned in the second annular recess the hollow mast element is radially separated from the ground at the first depth by the first annular recess and the freeroom.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) In what follows, an example of a preferred embodiment is described, which is visualized in the accompanying drawings, in which:

(2) FIG. 1 shows a first exemplary embodiment of a recess according to the invention, from above;

(3) FIG. 2 shows a section of FIG. 1;

(4) FIG. 3 shows a second exemplary embodiment of a recess for a mast element, from above;

(5) FIG. 4 shows a section of FIG. 3;

(6) FIG. 5 shows a mast element in a ground, from above;

(7) FIG. 6 shows a section of FIG. 5;

(8) FIG. 7 shows a drill rig in a front view; and

(9) FIG. 8 shows FIG. 7 from above.

DETAILED DESCRIPTION OF THE DRAWINGS

(10) The figures are shown in a simplified and schematic way, and details that are not important to elucidate what is new in the invention may have been left out in the figures. The various elements in the figures are not necessarily shown to scale. Like and corresponding elements will be indicated by the same reference numbers in the figures. Any positional indications (such as “over”, “under,” “between”) refer to positions shown in the figures.

(11) FIGS. 1 and 2 show a first exemplary embodiment according to the invention, from above and in a section A-A respectively. A first recess 10 with a first diameter 10D and a first depth 10L gives an outer boundary 10F for the recess. A second recess 20 with a second diameter 20D and a second depth 20L surrounds a first core 20K1. Between the first recess 10 and the second recess 20, a second core 20K2 is defined. By removing the second core 20K2, an annular freeroom 88 is generated between the outer surface 10F of the first recess 10 and the outer surface 20F of the second recess, as a mast element 77 is arranged in the recess 20 (FIG. 6).

(12) The second recess 20 is deepened in a slot portion 20S from the second depth 20L to a third depth 20L3. The slot portion 20S surrounds a third core 20K3.

(13) To prevent drilling dust and mud in the slot portion 20S, the first core 20K1 and the second core 20K2 are removed before the slot portion 20S is formed.

(14) FIGS. 3 and 4 show a second exemplary embodiment from above and in a section B-B, respectively. In FIGS. 3 and 4, the first core 20K1 is partially intact and the first recess 10 and the second recess 20 are arranged eccentrically, so that the freeroom 88 will have a sickle-shaped base.

(15) FIGS. 5 and 6 show, from above and in a section C-C, respectively, a hollow mast element 77 arranged in the second slot portion 20S. The ground 99 gives the mast element 77 an external support, while the third core 10K3 gives the mast element an internal support. The freeroom 88 is annular and provides external access to the mast above the bottom surface 88F of the freeroom.

(16) FIGS. 7 and 8 show, from the front and from above, respectively, a drill rig 5 suitable for forming the freeroom 88 shown in FIGS. 1-6. The drill rig comprises a replaceable slot drill 51 arranged to form the recesses 10, 20 shown in FIGS. 1-6. The drill rig 5 is secured to the ground 99 via two anchoring elements 4 comprising universal joints 44 and lower coupling portions 45. The lower coupling portion 45 is fixed to the ground 99. The universal joint 44 makes the drill rig 5 pivotable around an axis 47 to facilitate the replacement of a drill 51, 52 and to provide better access when material is to be removed within the recess 10.

(17) It should be noted that all the above-mentioned embodiments illustrate the invention, but do not limit it, and persons skilled in the art may construct many alternative embodiments without departing from the scope of the attached claims.

(18) The use of the verb “to comprise” and its different forms does not exclude the presence of elements or steps that are not mentioned in the claims. The indefinite article “a” or “an” before an element does not exclude the presence of several such elements.

(19) The fact that some features are indicated in mutually different dependent claims does not indicate that a combination of these features cannot be used with advantage.