DRILLING BUCKET AND METHOD FOR PRODUCING A BORE IN THE GROUND

Abstract

The invention relates to a drilling bucket and a method for producing a bore with a drilling bucket, wherein the drilling bucket is driven in a rotating manner and introduced into the ground, wherein ground material is removed and received in an internal space of a tubular base body of the drilling bucket, and for emptying the drilling bucket is withdrawn from the bore and a bottom on the tubular base body is folded open. According to the invention the drilling bucket is rotated in a reversing manner during emptying, wherein ground material received in the drilling bucket is pressed against at least one impact wall and, in doing so, the ground material is specifically compacted and deformed for easier loosening from the internal space.

Claims

1. Drilling bucket having a tubular base body, on the upper side of which a connecting means to a drill bar is arranged and on the underside of which a bottom is supported such that it can be folded open, wherein on the bottom a cutting means for removing ground material and at least one through-opening is provided, which is designed for the passage of removed ground material into an internal space of the tubular base body, wherein in the internal space of the tubular base body at least one impact wall is fixed which substantially extends over the entire axial length of the internal space, limits the internal space of the tubular base body in some areas and forms an impact surface for ground material received in the internal space.

2. Drilling bucket according to claim 1, wherein the at least one impact wall has a run-in radius and/or a run-out radius.

3. Drilling bucket according to claim 1, wherein two impact walls are provided which lie opposite each other in the internal space.

4. Drilling bucket according to claim 1, wherein the tubular base body is of cylindrical or conical design on the internal side.

5. Drilling bucket according to claim 1, wherein the at least one impact wall is designed so as to be inclined with respect to a longitudinal axis of the tubular base body.

6. Drilling bucket according to claim 1, wherein through the at least one impact wall a rear space is separated from the internal space, in which lines and/or a linkage are arranged.

7. Drilling bucket according to claim 1, wherein the bottom has a closing plate capable of turning, with which the at least one through-opening can be closed.

8. Method for producing a bore in the ground with a drilling bucket according to claim 1, in which the drilling bucket is driven in a rotating manner and introduced into the ground, wherein ground material is removed and received in an internal space of a tubular base body of the drilling bucket, and for emptying the drilling bucket is withdrawn from the bore and a bottom of the tubular base body is folded open, wherein the drilling bucket is rotated in a reversing manner during emptying, wherein ground material received in the drilling bucket is pressed against at least one impact wall and, in doing so, the ground material is specifically compacted and deformed for easier loosening from the internal space.

9. Method according to claim 8, wherein the created bore is filled with a hardenable mass, wherein a pile-shaped foundation element is produced.

Description

[0021] The invention is described further hereinafter by way of a preferred embodiment illustrated schematically in the accompanying drawings, wherein show:

[0022] FIG. 1 a perspective view of a drilling bucket according to the invention;

[0023] FIG. 2 a partially sectional side view of the drilling bucket of FIG. 1;

[0024] FIG. 3 a side view of the drilling bucket of FIGS. 1 and 2; and

[0025] FIG. 4 a cross-sectional view according to section A-A of FIG. 3.

[0026] A drilling bucket 10 pursuant to the invention and according to FIG. 1 has a cylindrical tubular base body 20, on the upper side of which a connecting means 12 for a drill bar is fixed. On its underside directed towards the ground the tubular base body 20 has a plate-shaped bottom 30, on which a cutting means 40 for removing ground material is arranged. The cutting means 40 comprises a central, protruding pilot bit 42, from which several cutting teeth 44 extend helically up to a through-opening 32 in the bottom 30. The through-opening 32 is designed for the passage of removed ground material into an internal space 11 of the tubular base body 20.

[0027] To empty the internal space 11 the bottom 30 can be opened by means of a locking means 60 from a locked position illustrated in FIG. 1. The locking means 60 comprises an actuating pin 64 on the upper side of the tubular base body 20 in the area of the connecting means 12.

[0028] As shown in greater detail in FIG. 2, a linkage 62 located in the interior of the tubular base body 20 is actuated by the spring-supported actuating pin 64, whereby a lower latch section 66 releases the plate-shaped bottom 30. The plate-shaped bottom 30 can be pivoted open in the downward direction via a lateral pivot joint 36 that is directed transversely to a longitudinal or drilling axis of the drilling bucket 10. In this pivoted-open position ground material inside the internal space 11 can be emptied at an emptying position. To close the bottom 30 this is simply pressed downwards against the ground with the drilling bucket 10, whereby the bottom 30 pivots back and is locked again in the latch section 66 in a substantially horizontal position.

[0029] The linkage 62 is arranged in a rear space 14 of the tubular base body 20, in which case the rear space 14 is separated by means of an impact wall 50 from the internal space 11 provided for receiving the ground material, as illustrated in greater detail in FIGS. 3 and 4 in particular.

[0030] In the illustrated drilling bucket 10 according to the invention a total of two impact walls 50 are arranged in the internal space 11, which lie substantially opposite each other and extend along the entire internal space 11 from the bottom 30 to a cover plate 22 on the upper side of the tubular base body 20. In the cover plate 22 an opening 24 for pressure compensation is provided. The impact walls 50 narrow the internal space 11 of the tubular base body 20, wherein run-in radii 52 are provided for easier entry and distribution of the removed ground material in the internal space 11. These follow a planar plate-shaped section of the impact walls 50 and, at least on one side of the impact wall 50, form a transition to an internal wall of the tubular base body 20.

[0031] The impact walls 50 are arranged so as to be inclined with respect to the longitudinal axis of the drilling bucket 10, in which case the distance of the impact walls 50 to the longitudinal axis tapers in the upward direction. In this way, the internal space 11 is designed such that it is conically tapered in the upward direction which facilitates downward-emptying of the ground material inside the internal space 11.

[0032] The rear space 14, which is in each case separated from the internal space 11 by the impact walls 50 and formed between the impact walls 50 and the internal wall of the tubular base body 20, serves to receive the linkage 62 of the locking means 60 or further lines and components not depicted here.