AUGER ARRANGEMENT

Abstract

The invention relates to an auger arrangement and a method for forming an auger arrangement having a first drill part and a second drill part which are of tubular or bar-shaped design and in which at least one drill part is provided on its external side with an auger flight, wherein on at least one of their end regions the drill parts have matching connecting sections, wherein a first connecting section is designed as a sleeve-like female part with keyway elements and a second connecting section is designed as a mandrel-like male part with keyway elements, wherein male part and female part are plugged axially into each other to form a releasable, torque-proof connection. According to the invention provision is made in that on an internal wall of the female part an annular internal groove is applied, in that on an external wall of the male part an annular external groove is applied, in that in a plugged-together state of female part and male part the internal groove and the external groove lie opposite each other and form an annular space, on an external wall of the female part at least one introduction opening with a passage to the annular internal groove is designed and in that in order to form an axial securing a flexible steel cable is inserted via the introduction opening into the annular space and fills this out completely or to a large degree.

Claims

1. Auger arrangement having a first drill part and a second drill part which are of tubular or bar-shaped design and in which at least one drill part is provided on its external side with an auger flight, wherein on at least one of their end regions the drill parts have matching connecting sections, wherein a first connecting section is designed as a sleeve-like female part with keyway elements and a second connecting section is designed as a mandrel-like male part with keyway elements, wherein male part and female part are plugged axially into each other to form a releasable, torque-proof connection, wherein on an internal wall of the female part an annular internal groove is applied, on an external wall of the male part an annular external groove is applied, in a plugged-together state of female part and male part the internal groove and the external groove lie opposite each other and form an annular space, on an external wall of the female part at least one introduction opening with a passage to the annular internal groove is designed and to form an axial securing a flexible steel cable is inserted via the introduction opening into the annular space and fills this out completely or to a large degree and on at least one connecting section a sealing region is arranged, wherein several external grooves and several internal grooves are provided which, in the plugged-together state, form several annular spaces for the axial securing, in that the keyway elements lie between the sealing region and the internal grooves or the external grooves and in that the sealing region on the mandrel-like male part is located in a front region.

2. Auger arrangement according to claim 1, wherein on a connecting section the internal grooves and the external grooves lie behind the keyway elements in a plug-in direction.

3. Auger arrangement according to claim 1, wherein the sealing region has at least one sealing ring.

4. Auger arrangement according to claim 1, wherein on the flexible steel cable on an end section a stop element is attached.

5. Auger arrangement according to claim 4, wherein the stop element can be received in the introduction opening.

6. Auger arrangement according to claim 4, wherein the introduction opening is designed as an elongated hole that extends along a part of the annular space and in that the stop element has a length that is smaller than the length of the elongated hole of the introduction opening.

7. Auger arrangement according to claim 1, wherein on a front end the flexible steel cable has an introduction tip.

8. Auger arrangement according to claim 4, wherein the stop element is arranged spaced apart from a rear end of the flexible steel cable, wherein a stand-alone latch section of the steel cable is formed which serves for the bilateral insertion of the steel cable into the annular space.

Description

[0031] The invention is described further hereinafter by way of preferred exemplary embodiments illustrated schematically in the drawings, wherein show:

[0032] FIG. 1 a schematic partial view of an auger arrangement according to the invention when being plugged together;

[0033] FIG. 2 a partial cross-sectional view of a female part on a drill part;

[0034] FIG. 3 a further cross-sectional view of the female part of FIG. 2 with the direction of section rotated by 90;

[0035] FIG. 4 an enlarged detailed view of internal grooves on the female part according to FIG. 3;

[0036] FIG. 5 a side view of a matching male part of a drill part for the auger arrangement according to the invention;

[0037] FIG. 6 a cross-sectional view of the male part of FIG. 5;

[0038] FIG. 7 a partial view of male part and female part in a plugged-together state;

[0039] FIG. 8 a cross-sectional view according to section C-C of FIG. 7;

[0040] FIG. 9 a detailed cross-sectional view concerning annular spaces formed in a plugged-together state;

[0041] FIG. 10 a top view of a steel cable according to the invention;

[0042] FIG. 11 a side view of the steel cable of FIG. 10; and

[0043] FIG. 12 a top view of a modified steel cable according to the invention.

[0044] An auger arrangement 10 according to the invention is shown schematically in FIG. 1 when plugging together a first drill part 12 and a second drill part 14. On one end the first drill part 12 has a first connecting section 20 that is designed as a female part 21 with a receiving space. Into this female part 21 a mandrel-like male part 41 can be inserted that is designed on a second connecting section 40 on the adjoining second drill part 14. On the first drill part 12 and the second drill part 14 an auger flight 16 for conveying drilled ground material is arranged in each case. The auger illustrated in FIG. 1 is right-handed but can also be of left-handed design.

[0045] The auger arrangement 10 according to the invention serves, in particular, for producing bores in the ground, e.g. for the production of ground piles for foundations for example. The auger arrangement 10 can be constructed of a plurality of drill parts which are connected to each other, as described in the following. On the lower end of the auger arrangement 10 a ground-removing tool is usually located, whereas on the other, upper end a connection to a rotary drill drive and, as the case may be, a fluid connection for supplying a fluid, such as drilling suspension or a hardenable mass, in the interior of the auger arrangement 10 are arranged.

[0046] In the following the construction of a female part 21 for the auger arrangement 10 according to the invention is described in conjunction with FIGS. 2 to 4. In FIGS. 2 to 4 the first connecting section 20 with the female part 21 is in each case illustrated without the tubular base body and the auger flight. The female part 21 is of sleeve-shaped design with an open end 22, into which the male part 41 can be inserted. To establish a torque-proof connection, first keyway elements 24 are designed in a center region of the receiving space of the female part 21. Between the first keyway elements 24 and the open end 22 two internal grooves 30 with a semi-circular groove cross-section are incorporated into an internal wall 28. On an external wall 36 of the female part 21 two introduction openings 38 are designed as elongated holes, as depicted graphically in FIG. 3. The introduction openings 38 are each connected via a passage to one of the grooves 30. Through the introduction openings 38 a steel cable can be inserted to form an axial securing, as described in greater detail hereinafter.

[0047] On the end of the first connecting section 20 lying opposite the open end 22 a first fixing section 34 is designed, to which the tubular base body can be attached, more particularly welded, to form the first drill part 12. Between the first fixing section 34 and the first keyways 24 a first sealing region 26 with a cylindrical internal wall is arranged. This first sealing region 26 serves to receive a corresponding sealing region that is designed on the related male part 41, as described in greater detail hereinafter. The first connecting section 20 with the female part 21 can be designed in one piece or as a multi-part welded part, as illustrated in the alternative embodiment variants according to FIGS. 2 and 3.

[0048] In FIGS. 5 and 6 a matching second connecting section 40 with a male part 41 is illustrated which can be plugged into the female part 21 according to FIGS. 2 to 4.

[0049] On its front end the mandrel-like and tubular male part 41 has a second sealing region 46 with grooves 47 to receive sealing rings. The second sealing region 46 is designed such that in the plugged-in state it forms a fluid-tight sealing with the first sealing region 26 on the female part 21.

[0050] Following the second sealing region 46 second keyway elements 44 are designed on an external side of the male part 41. These correspond to the first keyway elements 24 on the female part 21 so that they can be plugged axially into each other to form a torque-transmitting connecting region, as depicted in FIG. 7.

[0051] In a subsequent external wall 48 of the male part 41 two external grooves 50 are applied. In a plugged-together state of male part 41 and female part 21 the external grooves 50 designed with a semi-circular cross-section lie opposite the internal grooves 30 on the female part 21 so that a joint annular space 60 with circular cross-section is formed. This is illustrated graphically in FIG. 9.

[0052] On a rear end of the male part 41 a second fixing section 54 is designed that serves to attach the further tubular body of the second drill part 14. For a modular construction each drill part 12, 14 can have a first connecting section 20 and a second connecting section 40 at opposite ends.

[0053] An interaction of the first and second keyway elements 24, 44 is depicted graphically in FIGS. 7 and 8. The first keyway elements 24 on the female part 21 and the second keyway elements 44 on the male part 41 are designed to correspond in their length and width so that they can be plugged axially into each other. The flanks of the keyway elements 24, 44 rest against each other and can serve for the torque transmission between female part 21 and male part 41. In FIG. 7 the two introduction openings 38 on the female part 21 are in addition indicated schematically.

[0054] The FIGS. 1 to 9 show the subject matter of the invention on a reduced scale, whereas in the ensuing FIGS. 10 to 12 a steel cable 70 provided for the invention is illustrated on a different, larger scale. The FIGS. 10 and 11 show a first steel cable 70 according to the invention with a cable base body 72. On one end of the cable base body 72 an introduction tip 74 is designed which serves for the introduction of the steel cable 70 via the introduction opening 38 in the female part 21 into the formed annular space 60. The flexible steel cable 70 preferably has a circular cross-section, the external diameter of which forms a clearance play with respect to the internal diameter of the annular space 60. The introduced steel cable 70 constitutes a form-fitting body which axially secures the drill parts 12, 14 plugged into each other in their position.

[0055] On the other end lying opposite the introduction tip 74 a block-like stop element 76 is fixed on the cable base body 72, preferably through brazing or welding. The block-like stop element 76 has a dimensioning that makes it possible to place the stop element 76 into the introduction opening 38 on the female part 21, while a further insertion into the annular space 60 is prevented.

[0056] An alternative embodiment of the steel cable 70 is shown in FIG. 12. This steel cable 70 also has a cable base body of a metallic flexible material as well as an introduction tip 74 and a block-like stop element 76 just as in the embodiment according to the FIGS. 10 and 11. In contrast to the first embodiment variant the block-like stop element 76 is spaced apart from the rear end so that a latch section 78 is designed. Taken together, the length of the latch section 78 and the length of the stop element 76 are here smaller than the length of the introduction opening 38 on the female part 21. This makes it possible that the steel cable 70 can initially be inserted with the introduction tip 74 in one introduction direction into the annular space 60 until the stop element 76 abuts on one end of the introduction opening 38 on the female part 21. In this abutment situation the latch section 78 is also received in the introduction opening 38. The cable 70 can now be displaced in the opposite direction into the annular space 60 so that the latch section 78 is introduced into the annular space 60. In this way, the steel cable 70 is received with both end regions in the annular space 60 so that the steel cable 70 is received and locked in a particularly reliable manner in the annular space 60.