EP3517727A1 - Core-drilling tool - Google Patents

Abstract

The invention relates to a core drilling tool (5) for earth or rock drilling with an outer first tubular body (10), on the lower tube edge (14) Abtragselemente (15) are provided for removing soil or rock material and which an upper ceiling portion (12). a connection device (20), which is attached to the ceiling section (12) and designed to transmit a drilling torque, and at least one inner second tubular body (40), at the lower tube edge (14) Abtragselemente (15) for removing soil or rock material are provided and which is disposed within the first tubular body (10). According to the invention it is provided that a coupling device (30) is provided on the first tubular body (10), with which the second tubular body (40) is releasably attached to the first tubular body (10).

Description

The invention relates to a coring tool for earth or rock drilling with an outer first tubular body, on the lower edge of the tube ablation elements are provided for removing soil or rock material and which has an upper ceiling portion, a connecting device which is attached to the ceiling portion and for transmitting a Bohrdrehmoments is formed, and at least one inner second tubular body, at the lower edge of the tube Abtragselemente for removing soil or rock material are provided and which is disposed within the first tubular body, according to the preamble of claim 1.

For earth and rock drilling two basic types of drilling tools are known. A first type relates to so-called full-cut drilling tools, in which the pending earth or rock material over the entire bore diameter is removed over the entire surface. Such drilling tools are used in particular in loose soil.

For hard soils, especially in rocky soils or rocks, so-called core drilling tools are used. Such core drilling tools have a tubular body, at the lower edge of the tube Abtragselemente are arranged. During drilling, a ring-shaped borehole is produced, whereby an inner core remains. The pending core is received in the cavity of the tubular body. Especially in the case of hard and brittle rocks, the drill core breaks off at a certain length because of the vibrations and vibrations that occur during drilling. The core thus loosened can be pulled out of the hole with the core bit.

As the diameter of the core increases, it becomes harder to break or loosen the core of the upcoming rock. To counter this problem, it is from the CN 102 011 548 A known to arrange one or more further inner tubular body coaxially with each other within an outer first tubular body. In this way, a pending core can be divided into one or more additional annular cores. These then break easier than a solid continuous core. Such a core drilling tool thus represents an intermediate form between a full-cut drilling tool and a normal core drilling tool.

In this known core drilling tool, two annular inner tubular bodies are disposed in an outer first tubular body, which are welded to an upper ceiling portion of the first tubular body. Such core drilling tools are complex from a production and maintenance point of view.

From the CN 102 011 549 A a coring tool is known in which coaxially within the tubular body a pilot drill bit projecting in the drilling direction is arranged. The pilot is provided on a fixed rod which extends coaxially through the tubular body. Such a core drilling tool produces a cylindrical core with a center hole.

From the US 9,249,631 B2 is also a core drilling tool with a central pilot out. In this case, the pilot is arranged on a displaceable rod, so that it can be pulled back after a central drilling to the rear.

The invention has for its object to provide a coring tool, which is particularly flexible.

The object is achieved according to the invention by a coring tool with the features of claim 1. Preferred embodiments are given in the dependent claims.

The core drilling tool according to the invention is characterized in that a coupling device is provided on the first tubular body, with which the second tubular body is releasably attached to the first tubular body.

A basic idea of the invention is to detachably arrange the at least one second tubular body within the first tubular body. For this purpose, a coupling device is provided with which the second tubular body is preferably connected in a form-fitting manner to the first tubular body. The coupling device is locked and unlocked, so that, for example, the second tubular body can be easily removed. Thus, the drilling tool with the first tubular body can also be used as a conventional core drilling tool. Furthermore, the core drilling tool according to the invention offers the possibility, depending on the nature of the pending rock, to easily change the at least one second tubular body, in order to replace it with a new second tubular body or a differently configured second tubular body. The differences may lie both in the axial length, the diameter and / or the configuration of the removal elements of the second tubular body.

A particularly preferred embodiment of the core drilling tool according to the invention can be seen in that the removal elements are designed as fixed cutting teeth and / or rotatably mounted roller body. The exchangeable removal elements can be adapted in particular to the pending soil conditions.

According to another embodiment of the invention, it is preferred that the connecting device has on the first tubular body a first receiving sleeve with an upwardly directed receiving opening for a positive connection. The connecting device may in particular be a so-called Kellybox, which is designed for connection to a drill pipe, in particular a Kelly bar. The first receiving sleeve can have a polygonal receiving hole, in particular a square hole. Such angular holes are advantageous for torque transmission. An axial securing can be achieved in particular by bolting with bolts directed transversely to the drilling direction.

The connecting device is attached to the upper ceiling portion of the first tubular body. The ceiling portion may be a closed or open plate, which is welded to the cylindrical first tubular body. The ceiling section can also be constructed of radially directed struts. A special preferred embodiment according to the invention is that the coupling device is arranged on the underside of the ceiling portion. Thus, the ceiling portion carries both the connecting device and the coupling device.

It is particularly advantageous that the coupling device has a second receiving sleeve with a downwardly directed receiving opening. The second receiving sleeve may preferably be similar or equal to the first receiving sleeve, but formed with opposite arrangement.

It is particularly expedient in this case that the first receiving sleeve and the second receiving sleeve are connected to each other or formed in one piece. For example, the first receiving sleeve and the second receiving sleeve can be constructed as identical parts, which are welded together in opposite arrangement or connected in any other suitable manner. A particularly stable design results from the fact that the first receiving sleeve and the second receiving sleeve are integrally formed on a sleeve member.

A further advantageous embodiment of the invention consists in that the coupling device has a plug-in element with a first plug-in region, which can be inserted into the second receiving sleeve. The plug-in element can itself be fixed or detachably attached to the second tubular body. Preferably, the second receiving sleeve also has a polygonal, in particular square hole. Accordingly, the first plug-in area of the plug-in element is correspondingly polygonal, in particular quadrangular. An axial securing can also be done by a transversely directed bolting.

A particularly flexible core drilling tool is achieved according to a development of the invention in that on a top side of the second tubular body, a third receiving sleeve is provided with an upwardly directed receiving opening. This third receiving sleeve can preferably be formed equal to the first and / or the second receiving sleeve. The third receiving sleeve also preferably has a polygonal receiving hole, in particular a square hole. From a manufacturing perspective, it is particularly advantageous that at least one receiving sleeve is formed as a Kellybox. Preferably, all receiving sleeves are designed as Kellyboxen. Kelly boxes represent standardized receptacles with a square hole, into which usually corresponding plug-in areas on Kelly bars or corresponding drill rods for torque transmission can be inserted. Thus, as the inner second tubular body, a conventional suitable core drilling tool can be used, which is inserted into the larger diameter first tubular body.

Furthermore, a particularly high flexibility is achieved according to a development of the invention in that the plug element has a second plug-in area, which is directed opposite to the first plug-in area and is designed for connection to the third receiving sleeve. The rod-shaped or rod-shaped plug-in element thus represents an intermediate part between the first tubular body and the second tubular body. The plug-in areas are preferably of the same design and in particular suitable for standardized Kelly boxes.

It is particularly advantageous that the plug-in element for setting a relative position between the first tubular body and the second tubular body by a plug-in element with different lengths is interchangeable. The plug-in element can, so to speak, serve as an adapter in order to connect the tubular bodies to one another in different arrangement variants. Thus, it is possible for example by selecting a plug element with a different length that either the first tubular body leads the second tubular body, or the second tubular body as a kind of centering leads the first tubular body. Also, the Abtragselemente of the first and second tubular body may lie in a common Abtragsebene. It can be achieved by simply replacing the plug element a particularly high array diversity in an efficient manner.

The invention is not limited to two tubular bodies. It can be provided a plurality of tubular body with different diameters, which are all or partially, as described above, coupled to each other.

Fig. 1

eine perspektivische Ansicht eines erfindungsgemäßen Kernbohrwerkzeugs;

Fig. 2

eine Seitenansicht des Kernbohrwerkzeugs von Fig. 1;

Fig. 3

eine Querschnittsansicht zu einem erfindungsgemäßen Kernbohrwerkzeug ohne einen inneren Rohrkörper;

Fig. 4

eine Querschnittsansicht des Kernbohrwerkzeugs von Fig. 3 mit einem eingesetzten zweiten Rohrkörper in einer Normalposition;

Fig. 5

eine Querschnittsansicht des Kernbohrwerkzeugs von Fig. 3 mit einem eingesetzten zweiten Rohrkörper in einer vorauseilenden Position;

Fig. 6

eine Querschnittsansicht des Kernbohrwerkzeugs von Fig. 3 mit einem eingesetzten zweiten Rohrkörper in einer rückgesetzten Position;

Fig. 7

eine perspektivische Ansicht eines Steckelementes für ein Kernbohrwerkzeug gemäß Fig. 4;

Fig. 8

eine perspektivische Ansicht eines anderen Steckelementes für das Kernbohrwerkzeug gemäß Fig. 5; und

Fig. 9

eine perspektivische Ansicht eines weiteren Steckelementes für das Kernbohrwerkzeug gemäß Fig. 6.

The invention is explained below with reference to exemplary embodiments, which are shown schematically in the drawings. In the drawings show:

Fig. 1

a perspective view of a core drilling tool according to the invention;

Fig. 2

a side view of the core drilling of Fig. 1 ;

Fig. 3

a cross-sectional view of a core drilling tool according to the invention without an inner tubular body;

Fig. 4

a cross-sectional view of the core drilling of Fig. 3 with an inserted second tubular body in a normal position;

Fig. 5

a cross-sectional view of the core drilling of Fig. 3 with an inserted second tubular body in an anticipatory position;

Fig. 6

a cross-sectional view of the core drilling of Fig. 3 with an inserted second tubular body in a reset position;

Fig. 7

a perspective view of a plug-in element for a coring tool according to Fig. 4 ;

Fig. 8

a perspective view of another plug-in element for the coring tool according to Fig. 5 ; and

Fig. 9

a perspective view of another plug-in element for the coring tool according to Fig. 6 ,

An embodiment of a core drilling tool 5 according to the invention is shown schematically in the FIGS. 1 and 2 shown. The core drilling tool 5 has an outer first tubular body 10 with a first larger diameter and an inner second tubular body 40 having a second smaller diameter inserted therein. The diameters of the two tubular bodies 10, 40 are so different that an annular cavity is formed between the first tubular body 10 and the second tubular body 40 disposed therein. Within the second tubular body 40, a cylindrical cavity is formed. At a pipe edge 14 of the first tubular body 10 a plurality of Abtragselemente 15 for removing earth or rock material are attached. The Abtragselemente 15 have obliquely directed cutting teeth 16 and rotatably mounted roller body 18, which are ausaebildet in particular for working hard rock material. In descending Way are also arranged on the second tube edge 44 of the second tubular body 40 Abtragselemente 15 with cutting teeth 16 and roller body 18 for working off of soil material.

The first tubular body 10 has at the upper end region, which is opposite to the lower end region with the Abtragselementen 15, a plate-shaped ceiling section 12, on which a connecting device 20 is provided for connection to a rotationally driven drill pipe. The connecting device 20 in this case has a first receiving sleeve 22 with a quadrangular in cross-section first receiving opening 23. The first receiving sleeve 22 is rotatably connected in a generally known manner via a plurality of stiffening plates 26 with the tubular body 10. Overall, the connecting device 20 is formed in the illustrated embodiment as a so-called Kellybox. A Kellybox is a standard connection element, wherein in the angular first receiving opening 23, a correspondingly angularly formed connection element can be inserted on a linkage. Via openings 24 on the first receiving sleeve 22, a positive connection via locking bolts 28 can be made, of which only a single bolt 28 is shown. Along the outside of the first tubular body 10, a conveyor coil 19 is mounted, which extends from the lower end to the upper end.

According to Fig. 3 is a cross-sectional view of the first tubular body 10 of the core drilling tool 5 from the FIGS. 1 and 2 shown. For reasons of clarity, the second tubular body 40 is omitted.

The ceiling section 12 has a center hole, wherein a coupling device 30 for detachably connecting the second tubular body 40 is arranged between the ceiling element 12 and the upper sleeve-like connecting device 20. The coupling device 30 comprises a second receiving sleeve 32, which is provided with a second receiving opening 33. Preferably, the second receiving sleeve 32 is formed in the same manner as the first receiving sleeve 22 of the connecting device 20, wherein the two receiving openings 23, 33 have a corresponding square hole. The two receiving sleeves 22, 32 are the same design, but arranged opposite. At its contact area, the two receiving sleeves 22, 32 are welded together. The second receiving sleeve 32 is placed over a shoulder 36 at the center hole of the ceiling portion 12, in which case a welding can also be done here. The overall arrangement of the two receiving sleeves 22, 32 is additionally stabilized via the stiffening plates 26 and firmly connected to the ceiling portion 12 and thus the tubular body 10. From the underside of the ceiling section 12, that is from the inner cavity of the tubular body 10, a rod-shaped plug-in element 60 is inserted from below into the second receiving opening 33 of the second receiving sleeve 32. The plug-in element 60 has an upper first plug-in area 62 and a downward plug-in area 64. Between the two plug-in areas 62, 64 a larger diameter center region 66 is arranged. The two plug-in areas 62, 64 are the same and mirror-symmetrical to the center section 66.

In the plug-in areas 62, 64 through-holes 68 are arranged, which correspond in the inserted position with the corresponding through holes 24 approximately at the second receiving sleeve 32. Thus, in the inserted position, a positive and axially fixed connection can be achieved by inserting locking bolts 28.

Fig. 4 shows a coring tool according to the invention 5 in cross-sectional view, wherein the second pipe body 40 is releasably secured within the first tubular body 10 via the coupling device 30 with the inserted plug-in element 60. The second pipe body 40 has, similar to the structure of the first pipe body 10, a plate-shaped ceiling portion 42 which is welded to an upper end portion of the second pipe body 40. At this ceiling portion 42 of the second tubular body 40, a third receiving sleeve 52 is attached to a third receiving opening 53 for coupling the second tubular body 40. This third receiving sleeve 52 with the third receiving opening 53 is formed in the same manner as the previously described receiving sleeves as a Kellybox. In the upwardly directed third receiving opening 53 of the third receiving sleeve 52 of the downward second insertion portion 64 of the plug-in element 60 is inserted and, as described above, via at least one inserted locking bolt 28 positively locked axially.

Overall, the center portion 66 of the male member 60 is formed so that the central portion 66 functions as a stopper member. In this case, the center region 66 abuts on both the upper second receiving sleeve 32 and the lower third receiving sleeve 52 to stop.

In the in Fig. 4 illustrated embodiment, the plug-in element 60 is formed with the central region 66 such that the Abtragselemente 15 of both the first tubular body 10 than the second tubular body 40 are at the same height. As such, a substantially planar machining may be accomplished with a cylindrical central core within the second tubular body 40 and a second annular core formed in the annular space between the first tubular body 10 and the second tubular body 40. The in the core drill 5 according to Fig. 4 Inserted plug 60 is in Fig. 7 shown enlarged.

Another arrangement form of the core drilling tool 5 according to the invention is shown in FIG Fig. 5 shown. In deviation from the normal position according to Fig. 4 the second tubular body 40 projects out of the first tubular body 10, so that the second tubular body 40 leads. The second tube body 40 can act as a kind of centering in this arrangement, while still creating a central core.

The arrangement variant according to Fig. 5 is achieved by using a modified plug-in element 60 with an axially longer center section 66. In the plug-in element 60 according to Fig. 5 the first plug-in area 62 and the second plug-in area 64 are equal to the corresponding plug-in areas of the plug-in element 60 according to FIGS FIGS. 4 and 7 educated. To achieve the configuration according to Fig. 5 So is only the plug 60 with respect to the arrangement of Fig. 4 switch. The plug-in element 60, which in the arrangement according to Fig. 5 is used is closer in Fig. 8 shown.

Another arrangement alternative for a core drilling tool 5 according to the invention is known Fig. 6 seen. In this case, the inner second tubular body 40 is set back relative to the outer first tubular body 10. This may also be desirable for certain soil conditions.

This arrangement can be achieved in a simple manner according to the invention in that a modified plug-in element 60 with an axially smaller center region 66 is used as clearly as in Fig. 9 is shown. The first plug-in area 62 and the second plug-in area 64 of the plug-in element 60 can, as in the other plug-in elements 60 according to the FIGS. 7 and 8 the same and with a square design, in particular according to the standard of a Kellybox be formed.

Claims (11)

Core drilling tool for earth or rock drilling with - An outer first tubular body (10), at the lower edge of the tube (14) Abtragselemente (15) are provided for removing soil or rock material and which has an upper ceiling portion (12), - A connecting device (20) which is attached to the ceiling portion (12) and formed for transmitting a Bohrdrehmoments, and - At least one inner second tubular body (40), at the lower tube edge (14) Abtragselemente (15) are provided for removing soil or rock material and which is disposed within the first tubular body (10),
characterized, - That on the first tubular body (10) has a coupling device (30) is provided, with which the second tubular body (40) is releasably attached to the first tubular body (10). Core drilling tool according to claim 1,
characterized,
in that the removal elements (15) are designed as fixed cutting teeth and / or rotatably mounted roller bodies (18). Core drilling tool according to claim 1 or 2,
characterized,
in that the connecting device (20) has on the first tubular body (10) a first receiving sleeve (22) with an upwardly directed receiving opening for (23) a positive connection. Core drilling tool according to one of claims 1 to 3,
characterized,
in that the coupling device (30) is arranged on an underside of the ceiling section (12). Core drilling tool according to one of claims 1 to 4,
characterized,
in that the coupling device (30) has a second receiving sleeve (32) with a downwardly directed second receiving opening (33). Core drilling tool according to claim 5,
characterized,
are that the first receiving sleeve (22) and the second receiving sleeve (32) connected to each other or integrally formed. Core drilling tool according to claim 5 or 6,
characterized,
in that the coupling device (30) has a plug-in element (60) with a first plug-in region (62) which can be inserted into the second receiving sleeve (32). Core drilling tool according to one of claims 1 to 7,
characterized,
that is provided with an upwardly third receiving opening (54) on an upper surface of the second tubular body (40) includes a third receiving sleeve (52). Core drilling tool according to one of claims 3 to 8,
characterized,
in that at least one receiving sleeve (22, 32, 52) is designed as a Kellybox. Core drilling tool according to one of claims 7 to 9,
characterized,
in that the plug-in element (60) has a second plug-in region (64) which is directed opposite to the first plug-in region (62) and is designed for connection to the third receiving sleeve (52). Core drilling tool according to one of claims 7 to 10,
characterized,
in that the plug-in element (60) can be exchanged for a relative position between the first tubular body (10) and the second tubular body (40) by a plug-in element (60) of different lengths.

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