EP2495389B1 - Drilling rod - Google Patents

Description

The invention relates to a drill pipe with at least two linkage elements, which are connected to each other in a rotationally and detachably connected manner, according to the preamble of claim 1.

The linkage elements of the drill string each have an inner tube and an outer tube, between which an annular receiving space is formed. Furthermore, the linkage elements each have an energy and / or data line which extends along a longitudinal axis of the drill string. The energy and / or data lines of the linkage elements are each connected to an induction coil, wherein for energy and / or data transmission along the drill string, the induction coils are inductively coupled to each other.

In particular, the drill pipe may be a drill pipe of an earth borer for drilling holes in the ground. Such holes are created, for example, for the purpose of ground improvement or for the creation of bored piles or sealing walls.

Since the holes to be created in the ground often have a considerable depth or length, the drill pipe are usually made of several parts of a plurality of linkage elements. The individual linkage elements each have at their ends connecting means for mechanical connection to an adjacent linkage element. For example, a first end of a linkage element has a male terminal region and a second end opposite the first end has a female terminal region. This makes it possible to connect a plurality of substantially identical linkage elements to a drill string or drill string. Important is Here, that not only the outer tubes, but also the inner tubes must be connected to each other.

When drilling, it is often desirable to pass data from a location within the wellbore, particularly the tip of the wellbore, to an operator of the wellbore. Such data may include, for example, pressure or temperature values, angles of inclination or salinity in the wellbore. In certain drilling methods, it may also be advantageous to pass data such as operating parameters to the borehole tip or drill bit, respectively. For this purpose, it is known to provide in a drill string energy and / or data lines, can be transmitted via the information along the drill string.

An example of a screw drill with two rod sections, each comprising an outer tube and an inner tube is in the DE 299 14 494 U1 described. Between inner tube and outer tube a cable is guided in each rod section. The cables are coupled to each other by means of plug connections.

For connecting lines within a drill string, it is also known to provide induction coils at the axial ends of the linkage elements, via which the lines can be inductively coupled.

Examples of such a front-side inductive coupling, although not in a double tube, are in the US 2002/0193004 A1 and the US 2010/0175890 A1 disclosed. The induction coils are arranged directly on the axial connection areas of the linkage elements.

A drill pipe with radially overlapping induction coils for an inductive coupling is known from GB 2 375 779 A known. In this inductive coupling annular coils are provided in tubular inserts.

The invention has for its object to provide a compact and easy to retrofit connection for energy and / or data lines in a drill string of linkage elements with inner and outer tube.

The object is achieved according to the invention by a drill string having the features of claim 1. Preferred embodiments are given in the dependent claims as well as the description and the figures.

The drill pipe according to the invention is characterized in that a first linkage member on an outer periphery of its inner tube, an inner induction coil and a second linkage member on an inner periphery of its outer tube has an outer induction coil and that the induction coils are constructed like a segment of several ring segment parts and overlap at least partially in the radial direction.

The drill string can basically be used in any drilling method and any drilling devices. The inner tube of the drill string, which can also be referred to as a double rod, can be used for example as a so-called flushing tube. Drilling in the ground is often carried out flushing, that is, it is a rinsing liquid introduced through the drill pipe into the ground, which emerges from the borehole at the bottom of the hole and backwash the detached cuttings. The inner tube thus serves to introduce the rinsing fluid into the wellbore.

Another function of the inner tube may also be the introduction of a curable suspension. To create bored piles, for example, concrete can be introduced into the borehole after boring while pulling the drill string over the inner pipe. The inner tube can therefore also be referred to as Betonierrohr.

A first basic idea of the invention is not to provide the induction coils which are in operative connection with one another on one and the same tube, ie not on the inner tube or on the outer tube, but to arrange a first induction coil on the inner tube and a second induction coil on the outer tube of the respective linkage element. The induction coils are thus according to the invention between the inner rod and the outer rod. In this way, the end faces of the linkage elements or the connecting portions of the linkage elements can be kept free, so that conventional connector systems can continue to be used. The inventive arrangement of the induction coils thus offers a possibility to retrofit existing drill pipe or linkage elements simply, wherein existing connector systems, in particular the outer tubes, can continue to be used.

Another basic idea of the invention can be seen in the fact that the induction coils which are in operative connection with one another are arranged in such a way that they overlap in the radial direction when the linkage elements are connected to one another, that is to say they are arranged radially at least in some regions. The radial arrangement The induction coils to each other also contributes to improved retrofitting, since the axial end faces of the rod elements can remain free.

For a simple installation of the induction coils, these are constructed according to the invention of several segments. This is to be understood in particular that the induction coils are not constructed in one piece, but from several parts. The individual parts or segments form ring segments of the annular coils.

The invention provides the possibility of arranging the induction coils at the transition between two linkage elements, but outside the connection or coupling areas of the linkage elements. The connection areas are thus not affected by the induction coils. In this case, a connection region is understood in particular to be that section of the outer tube and / or of the inner tube which serves for the rotationally fixed and axially fixed connection of the corresponding tubes to one another. A connection region may comprise, for example, a thread, one or more grooves, detents or other connector systems. According to the invention, the induction coils are preferably arranged axially and / or radially spaced from the connecting areas or connecting surfaces of the linkage elements.

In order to achieve a particularly compact arrangement, it is preferred that at least one of the induction coils is arranged in an annular receiving groove. The receiving groove may in particular be an outer groove on the outer circumference of the inner tube or an inner groove on the inner circumference of the outer tube. Accordingly, it is particularly preferred that the inner induction coil is arranged in an outer groove of the inner tube of the first linkage element and / or the outer induction coil in an inner groove of the outer tube of the second linkage element. Due to the split, constructed of several ring segment parts induction coils they can be particularly easily inserted into the corresponding grooves.

The handling of the induction coils, in particular the insertion into corresponding grooves, can be simplified in that at least two ring segment parts are detachably connected to one another. In this case, a releasable connection is understood in particular as meaning a connection which is loosened with tools or by hand and, in particular, by a reversal of the solution process, again can be restored. In a releasable connection, the connected elements are not substantially damaged in their solution from each other. A detachable connection can be, for example, a screw, plug or latching connection.

A further preferred embodiment with regard to the induction coils is given by the fact that at least two ring segment parts are mutually movable. In this way, the shape of the induction coil can be changed, which further simplifies the insertion of the coil in a groove. It is particularly preferred that at least two ring segment parts are rotatably connected to each other. By the rotary joint, whose axis of rotation can extend in particular parallel to a longitudinal axis of the induction coil, a further simplification of the insertion of the coil is achieved in the corresponding linkage member in an advantageous manner. There may be provided means for locking the rotary joint to securely hold an inserted induction coil.

In a further preferred embodiment of the invention, it is provided that the inner tube of the first linkage element has a plug-shaped or sleeve-shaped connection region for connection to a further inner tube and that the inner induction coil is arranged axially spaced from the plug-shaped or sleeve-shaped connection region. Thus, the connection area is available without interference from the induction coil for the connection of the inner tube of an adjacent linkage element. The inner tube may in particular have a receiving groove, which is provided axially spaced from the connection region and in which the induction coil is arranged.

In a particularly preferred embodiment of the invention, it is provided that the outer induction coil is arranged within a plug-shaped connection part of the outer tube of the second linkage element. The outer induction coil is thus preferably positioned in composite linkage members so that it is located radially within a male connection part of the outer tube of the second linkage member.

About the outer tube and the pipe joints between two adjacent outer tubes usually considerable torques are transmitted during drilling. By the arrangement of the outer induction coil radially within a connection part of the outer tube, the connecting part is completely available for the provision of mechanical stability. This is also the case in particular because the connection region of a plug-shaped connection part is usually located on the outer circumference of the connection part and thus can be completely kept free of the induction coil. The arrangement of the coil inside the connection part also makes it possible to reuse already existing plug-shaped connection parts when retrofitted with induction coils largely unchanged. Thus, a linkage element can be retrofitted simply by arranging an induction coil on the plug-shaped connection part of its outer tube on its inner circumference.

A simple retrofittability and interchangeability in the event of a defect can be achieved in that at least one of the linkage elements comprises an adapter or mounting sleeve on which the inner induction coil and / or the outer induction coil is mounted. The mounting sleeve thus at least partially forms a portion of the inner tube of the first linkage member and / or a portion of the outer tube of the second linkage member.

Preferably, the mounting sleeve is a separate from the rod member part which is in particular fixed, preferably axially fixed and rotationally fixed, connected to the rod element. The inserted mounting sleeve is therefore preferably not movable relative to the linkage element. In particular, it can be provided that the mounting sleeve is welded, pressed or screwed to a tube main body of the inner tube and / or the outer tube. For a replacement of the mounting sleeve this is preferably releasably inserted into the rod element. It is particularly preferred if the mounting sleeve can be inserted in the longitudinal direction in the rod element.

The first linkage element preferably has a first mounting sleeve and the second linkage element has a second mounting sleeve. The mounting sleeves are mechanically coupled together in a preferred embodiment.

With particular regard to the outer induction coil, the mounting sleeve is preferably designed for insertion into a tube main body or a connection region of the outer tube. The mounting sleeve for the outer induction coil can thus be used in principle without a special adaptation of the torque and axial forces transmitting outer tube in this.

In particular, with regard to the inner induction coil, it may be advantageous to arrange the mounting sleeve on the outer circumference of a pipe main body of the inner tube. Since lower forces are usually transmitted via the inner tube than via the outer tube, it may also be advantageous for a particularly compact arrangement to arrange the mounting sleeve for the inner induction coil in the axial extension of the tube main body of the inner tube.

Preferably, the mounting sleeve comprises a receiving area for the inner induction coil and / or the outer induction coil. For this purpose, for example, an inner groove and / or an outer groove may be provided on the mounting sleeve.

It is particularly preferred that the mounting sleeve has a tubular portion which is arranged in the axial extension of a tube main body of the inner tube of the first linkage member. It is also possible to provide the mounting sleeve in addition to an existing axial end portion of the inner tube. An existing linkage element can thus be retrofitted particularly simply by replacing or supplementing an axial end of its inner tube with the inner sleeve with the induction coil.

A further preferred embodiment is that the mounting sleeve is inserted into a connection part of the outer tube. This provides an easy way to retrofit a linkage element, wherein the connection part of its outer tube, over which possibly significant forces are transmitted, can remain largely unchanged. In particular, it is inventively preferred to arrange the mounting sleeve within a plug-shaped connection part of the outer tube and / or fasten. This can be easily attached to the outer tube an outer induction coil.

To guide the power and / or data line, the mounting sleeve preferably has a cable channel. The cable channel may comprise a passage opening for the power and / or data line, via which the line from the inner and / or outer induction coil into the annular space between the inner tube and is guided to the outer tube. Preferably, the cable channel extends in the longitudinal direction of the rod element or the drill string.

A good ease of maintenance of the drill string is achieved in that the outer tube of the first linkage member and / or the second linkage member has an openable lid for access to the power and / or data line.

Fig. 1:

eine Querschnittsansicht eines Gestängeelements eines Bohrgestänges mit separaten Montagehülsen und Induktionsspulen;

Fig. 2:

eine Querschnittsansicht des Gestängeelements aus Fig. 1 mit eingesetzten Montagehülsen und Induktionsspulen;

Fig. 3:

eine perspektivische Ansicht eines oberen Abschnitts des Gestängeelements aus Fig. 1;

Fig. 4:

eine perspektivische Ansicht eines unteren Abschnitts des Gestängeelements aus Fig. 1;

Fig. 5:

eine Seitenansicht einer inneren Induktionsspule;

Fig. 6:

eine Seitenansicht einer ersten Montagehülse;

Fig. 7:

eine Querschnittsansicht der Montagehülse aus Fig. 6 entlang der Linie AA von Fig. 8;

Fig. 8:

eine Seitenansicht der Montagehülse aus Fig. 6 mit eingesetzter innerer Induktionsspule;

Fig. 9:

eine perspektivische Ansicht der Montagehülse aus Fig. 6 mit separater innerer Induktionsspule;

Fig. 10:

eine perspektivische Ansicht der Montagehülse aus Fig. 6 mit eingesetzter inner Induktionsspule;

Fig. 11:

eine perspektivische Ansicht einer inneren Induktionsspule;

Fig. 12:

eine Querschnittsansicht der inneren Induktionsspule aus Fig. 11 entlang der Linie A-A von Fig. 14;

Fig. 13:

eine Querschnittsansicht der inneren Induktionsspule von Fig. 11 in vertikaler Richtung;

Fig. 14:

eine Ansicht von vorne der inneren Induktionsspule von Fig. 11;

Fig. 15:

eine Schnittansicht einer zweiten Montagehülse mit separater äußerer Induktionsspule;

Fig. 16:

eine Schnittansicht der zweiten Montagehülse aus Fig. 15 mit eingesetzter äußerer Induktionsspule;

Fig. 17:

eine perspektivische Ansicht der zweiten Montagehülse aus Fig. 15 mit eingesetzter Induktionsspule;

Fig. 18:

eine perspektivische Ansicht einer äußeren Induktionsspule;

Fig. 19:

eine Querschnittsansicht der äußeren Induktionsspule aus Fig. 18 entlang der Linie A-A von Fig. 21;

Fig. 20:

eine Querschnittsansicht der äußeren Induktionsspule von Fig. 18 in vertikaler Richtung;

Fig. 21:

eine Ansicht von vorne der äußeren Induktionsspule von Fig. 18;

Fig. 22:

eine perspektivische Ansicht einer inneren Induktionsspule und

Fig. 23:

eine perspektivische Ansicht einer äußeren Induktionsspule.

The invention will be further elucidated on the basis of preferred exemplary embodiments, which are illustrated in the attached schematic drawings. Hereby shows:

Fig. 1:

a cross-sectional view of a rod element of a drill pipe with separate mounting sleeves and induction coils;

Fig. 2:

a cross-sectional view of the linkage element Fig. 1 with inserted mounting sleeves and induction coils;

3:

a perspective view of an upper portion of the linkage element Fig. 1 ;

4:

a perspective view of a lower portion of the rod element Fig. 1 ;

Fig. 5:

a side view of an inner induction coil;

Fig. 6:

a side view of a first mounting sleeve;

Fig. 7:

a cross-sectional view of the mounting sleeve Fig. 6 along the line AA of Fig. 8 ;

Fig. 8:

a side view of the mounting sleeve Fig. 6 with inserted inner induction coil;

Fig. 9:

a perspective view of the mounting sleeve Fig. 6 with separate inner induction coil;

Fig. 10:

a perspective view of the mounting sleeve Fig. 6 with inserted inner induction coil;

Fig. 11:

a perspective view of an inner induction coil;

Fig. 12:

a cross-sectional view of the inner induction coil Fig. 11 along the line AA of Fig. 14 ;

Fig. 13:

a cross-sectional view of the inner induction coil of Fig. 11 in the vertical direction;

Fig. 14:

a front view of the inner induction coil of Fig. 11 ;

Fig. 15:

a sectional view of a second mounting sleeve with a separate outer induction coil;

Fig. 16:

a sectional view of the second mounting sleeve Fig. 15 with inserted outer induction coil;

Fig. 17:

a perspective view of the second mounting sleeve Fig. 15 with inserted induction coil;

Fig. 18:

a perspective view of an outer induction coil;

Fig. 19:

a cross-sectional view of the outer induction coil Fig. 18 along the line AA of Fig. 21 ;

Fig. 20:

a cross-sectional view of the outer induction coil of Fig. 18 in the vertical direction;

Fig. 21:

a front view of the outer induction coil of Fig. 18 ;

Fig. 22:

a perspective view of an inner induction coil and

Fig. 23:

a perspective view of an outer induction coil.

In all figures, identical or corresponding components are provided with the same reference numerals.

Figures 1 and 2 show an embodiment of a linkage element 10 of a drill string 1 according to the invention, which has a first connection area at a first axial end 12 and a second connection area at a second axial end 13. At the two connection areas can each have another Linkage element to be connected. Thus, by connecting together a plurality of linkage elements, which may be constructed substantially the same, a drill pipe of basically any length can be formed. A longitudinal axis of the drill string is identified by the reference numeral 14.

Fig. 3 shows a section of the upper axial end of the rod member 10 in a perspective view. In Fig. 4 the lower axial end of the linkage element 10 is shown in a perspective view.

An embodiment of a linkage element 10, which may be part of the drill string according to the invention, is described below with reference to the FIGS. 1 to 4 described.

The linkage element 10 has an inner tube 20 and a coaxially arranged outer tube 40 for this purpose. Inner tube 20 and outer tube 40 are rotatably connected to each other, that is, there is essentially no relative rotational movement between inner tube 20 and outer tube 40 is possible.

Between inner tube 20 and outer tube 40, an annular receiving space 16 is formed, in which at least one cable 17 is arranged, which in the Figures 1 and 2 only schematically indicated. The annular space between inner tube 20 and outer tube 40 or a portion thereof can thus also be referred to as a cable reservoir. The outer tube 40 has a cover 18 for opening the cable reservoir or the receiving space 16. This provides easy access to the cable reservoir or the receiving space 16. In the receiving space 16, at least in sections, a channel 15 for or possibly the cable 17 is formed.

The inner tube 20 includes a tube body 22 which extends over the substantial part of the length of the linkage member 10. The tube body 22 is tubular with substantially constant wall thickness. At one in the Figures 1 and 2 lower end of the tube body 22, a first intermediate piece 24 is provided, which forms a part of the inner tube 20. Like that Figures 1 and 2 it can be seen, the first intermediate piece equally constitutes a part of the outer tube 40. In the first intermediate piece 24, an axial channel 28 is provided for the passage of the cable 17.

At a second, upper end of the inner tube 20, a second intermediate piece 26 is provided. The second intermediate piece 26 is disposed within the outer tube 40 and fixedly connected thereto. Preferably, the intermediate piece 26 is pressed into the outer tube 40 and / or welded thereto.

First intermediate piece 24 and second intermediate piece 26 are used to couple mounting sleeves 60, 80. The intermediate pieces 24, 26 can therefore also be referred to as coupling pieces.

The outer tube 40 includes a tubular tube body 41 which extends along a substantial portion of the length of the outer tube 40. At the two axial ends of the outer tube 40, a respective connecting part 42 is provided for connection to an adjacent outer tube. That in the Figures 1 and 2 lower end of the outer tube 40 includes a receiving socket 44, which may also be referred to as a female connector part. The receiving socket 44 comprises in the illustrated embodiment, a first socket part 45 and a second socket part 46, which are fixedly connected to each other, in particular welded, are. In the receiving bush 44 axial ribs 47 and axial grooves 48 are provided to produce a rotationally fixed connection with an adjacent outer tube. Furthermore, the receiving bushing 44 comprises a circumferential groove 49 for producing an axially fixed connection with an adjacent outer tube. The circumferential groove 49 is provided as an internal groove in the receiving socket 44. In an area of the circumferential groove 49, an access opening 50 is provided, via which a securing element, in particular a link chain 57 for axial securing can be introduced with an adjacent outer tube.

At one in the Figures 1 and 2 The end shown above, the outer tube 40 on a plug part 52, which may also be referred to as a male connector. The plug part 52 comprises axial ribs 53 and axial grooves 54, which correspond to the axial ribs 47 and axial grooves 48 of the receiving bushing 44. Furthermore, the plug part 52 has a circumferential groove 49 corresponding circumferential groove 55 which is formed as an outer groove on the plug part 52. For axial securing of a plug part 52 with respect to a receiving bush 44, a link chain 57 is inserted into the circumferential grooves 49, 55.

Within the receiving socket 44, a first mounting sleeve 60 is provided to receive a first induction coil, which may also be referred to as an inner induction coil 100. The first mounting sleeve 60 includes a tubular portion 61 which forms part of the inner tube 20. Furthermore, the first mounting sleeve 60 comprises a support ring 62 for supporting on the outer tube 40. At an axial end portion of the tubular portion 61, a connection portion 64 is provided for coupling with the inner tube of an adjacent linkage member. In the illustrated embodiment, the terminal portion 64 is formed as a female terminal portion.

For receiving the inner induction coil 100, a radial receiving groove 66 is formed on the first mounting sleeve 60, in particular on its tubular portion 61. The receiving groove 66 is located on an outer periphery of the tubular portion 61 and thus may be referred to as an outer groove.

Adjacent to the receiving groove 66, an engagement groove or opening 67 for facilitating removal of the inner induction coil 100 is formed, as well as the FIGS. 4 . 9 and 10 can be seen.

Between the support ring 62 and the tubular portion 61, a cable channel 76 is formed for the passage of a cable.

At an end opposite the connection region 64, the first mounting sleeve 60 comprises a connection region 68 for connection to the tube main body 22 of the inner tube 20 or the first intermediate piece 24 or generally to a coupling piece of the inner tube 20.

The linkage element 10 has at its in the Figures 1 and 2 axial end 13 shown above, a second mounting sleeve 80, which is designed to receive an outer induction coil 110. The second mounting sleeve 80 includes a tubular portion 81 which forms part of the inner tube 20. The tubular section 81 has a connection region 84, which can also be referred to as a male connection region. The connection region 84 is formed corresponding to the connection region 64 of the first mounting sleeve 60. At its end opposite the connection region 84, there is a connection region 88 for connecting the second assembly sleeve 80 to the pipe main body 22 of the inner tube 20 and the second intermediate piece 26 or generally a coupling piece of the inner tube 20 is provided.

The second mounting sleeve 80 further comprises a sleeve body 82, which is provided for abutment against an inner periphery of a portion of the outer tube 40, in particular to its connection part 42 and / or its tube body 41. The sleeve body 82 has on its inner circumference a radial receiving groove 86 for the outer induction coil 110. The receiving groove 86 may also be referred to as an inner groove and extends annularly in the circumferential direction along an inner circumferential surface of the sleeve body 82. Between tubular portion 81 and sleeve body 82, a cable channel 96 is provided for the passage of a cable.

The cover 18 for the cable reservoir is preferably arranged at an axial end of the tube main body 41 of the outer tube 40, in particular adjacent to the first and / or second intermediate piece 24, 26.

As already stated, a drill pipe according to the invention can be produced by stringing a plurality of linkage elements 10, 11 together. In a drill pipe according to the invention, therefore, in particular a first linkage element 10 may be provided, which has the features which, in connection with the lower axial end of the in the Figures 1 and 2 described linkage element are described. Further, a second linkage member 11 may be provided having the features described in connection with the upper axial end of the linkage member. Accordingly, the Figures 1 and 2 Also be understood that in the respective lower region, a first linkage element 10 and in the respective upper region, a second linkage element 11 is shown. The linkage elements 10, 11 can be coupled together. The in connection with the FIGS. 5 to 23 may optionally refer to a first linkage member 10 or a second linkage member 11.

The FIGS. 5 to 10 show further details of an inner induction coil 100 and a first mounting sleeve 60 or a part thereof. The first mounting sleeve 60 serves in particular for receiving an inner induction coil 100 Fig. 7 can be seen, the induction coil 100 more, in the present case three, ring segment parts 102. The induction coil 100 has between two ring segment parts 102 an opening portion 109 or slot on which the Spool for insertion into the intended receiving groove 66 can be pulled apart. The thus divided induction coil 100 can be easily inserted into the radial receiving groove 66.

For positionally secure fixing of the induction coil 100, fixing devices 70 are provided on the receiving groove 66, which in the present case are designed, for example, as recesses in the groove surface. Correspondingly, the induction coil 100 has corresponding fixing devices 108, which in the present case are designed as pins on the inner surface of the coil.

FIGS. 11 to 14 show on the basis of an exemplary embodiment, further details of an inner induction coil 100. The individual ring segment parts 102 are connected via connectors 104 together. The connectors 104 may also form part of a bobbin or the turns of the bobbin. Between two ring segment parts 102, a cover 105 is provided, which covers the connectors 104.

Further details of an inner induction coil 100 will be described with reference to the embodiment in FIG Fig. 22 shown. At least some of the ring segment parts 102 are rotatably connected to each other via pivot joints 106. Rotary axes of the rotary joints 106 extend along a longitudinal axis of the induction coil 100. To connect the coil body to the energy and / or data line, an electrical connection device or connection line 107 is provided on one of the ring segment parts 102. This is preferably located in or near the opening region 109 of the inner induction coil 100. The connection line 107 is preferably arranged on an end face of the induction coil 100.

FIGS. 15 to 17 show a second mounting sleeve 80 and an outer induction coil 110. The second mounting sleeve 80 is used in particular for receiving an outer induction coil 110. The outer induction coil 110 is constructed substantially corresponding to the inner induction coil 100 and has a larger compared in comparison to this, so that the outer induction coil 110 can be arranged around the inner induction coil 100 around.

FIGS. 18 to 21 show another exemplary embodiment of an outer induction coil 110. The outer induction coil 110 substantially corresponds to the inner induction coil 100 and is also constructed of a plurality of ring segment parts 112 which are interconnected via connectors 114. Between two ring segment parts 112, an opening portion 119 or slot is formed, on which the coil for insertion into the intended receiving groove 86 can be contracted. The thus divided induction coil 110 can be easily inserted into the radial receiving groove 86.

Further details of an outer induction coil 110 are shown in FIG Fig. 23 shown. Corresponding to the inner induction coil 100, some of the ring segment parts 112 are rotatably connected to one another via pivot joints 116, the axes of rotation of the pivot joints 116 running along a longitudinal axis of the induction coil 110. Between two ring segment parts 112, a cover 115 is provided, which covers the connector 114. For connecting the bobbin to the power and / or data line, an electrical connection device or connection line 117 is provided, which is preferably located in or near the opening region 119. The connecting line 117 is preferably arranged on an end face of the induction coil 110.

For positionally or rotationally secure fixation of the induction coil 110, fixing devices 90 are provided on the receiving groove 86, which in the present case are designed, for example, as recesses in the groove surface. Accordingly, the induction coil 110 has corresponding fixing means 118, which are presently designed as pins on the outer surface of the coil. The fixing devices 118 of the induction coil 110 can be brought into engagement with the fixing devices 90 of the second mounting sleeve 80.

Both the inner induction coil and the outer induction coil have a bobbin with at least one turn. The one or possibly more turns of the bobbin can basically be arranged arbitrarily. For example, the induction coil 100, 110 may have one or more windings in the circumferential direction. The induction coil 100, 110 may also be formed as a so-called toroidal coil, in which one or more windings are wound around the ring, which may be referred to as a toroidal core.

Claims (11)

1. Drill rod having at least two rod elements (10, 11), which are connected to each other in a rotationally fixed and detachable manner, wherein

   - the rod elements (10, 11) each have an inner pipe (20) and an outer pipe (40), between which a ring-shaped receiving space (16) is formed,

   - the rod elements (10, 11) each have an energy and/or data line (17), which extend(s) along a longitudinal axis (14) of the drill rod (1), and

   - the energy and/or data lines (17) of the rod elements (10, 11) are each connected to an induction coil (100, 110), wherein the induction coils (100, 110) can be coupled to each other inductively for energy and/or data transmission along the drill rod (1), and

   - a first rod element (10) has an inner induction coil (100) located at an outer circumference of its inner pipe (20) and a second rod element (11) has an outer induction coil (110) located at an inner circumference of its outer pipe (40),
   wherein

   - the induction coils (100, 110) are constructed segmentally of several ring segment parts (102, 112) and overlap at least in some areas in the radial direction.
2. Drill rod according to claim 1,
   wherein
   at least one of the induction coils (100, 110) is arranged in a ring-shaped receiving groove (66, 86).
3. Drill rod according to claim 1 or 2,
   wherein
   at least two ring segment parts (102, 112) are detachably connected to each other.
4. Drill rod according to one of the claims 1 to 3,
   wherein
   at least two ring segment parts (102, 112) are rotatably connected to each other.
5. Drill rod according to one of the claims 1 to 4,
   wherein

   - the inner pipe (20) of the first rod element (10) has a plug- or sleeve-shaped junction area (64, 84) for connection to a further inner pipe and

   - the inner induction coil (100) is arranged in an axially spaced manner from the plug- or sleeve-shaped junction area (64, 84).
6. Drill rod according to one of the claims 1 to 5,
   wherein
   the outer induction coil (110) is arranged inside a plug-shaped junction part (42, 52) of the outer pipe (40) of the second rod element (11).
7. Drill rod according to one of the claims 1 to 6,
   wherein
   at least one of the rod elements (10, 11) comprises a mounting sleeve (60, 80), on which the inner induction coil (100) and/or the outer induction coil (110) is mounted.
8. Drill rod according to claim 7,
   wherein
   the mounting sleeve (60, 80) has a pipe-shaped section (61, 81) which is arranged in the axial extension of a basic pipe body (22) of the inner pipe (20) of the first rod element (10).
9. Drill rod according to one of the claims 7 or 8,
   wherein
   the mounting sleeve (60, 80) is inserted into a junction part (42) of the outer pipe (40).
10. Drill rod according to one of the claims 7 to 9,
    wherein
    the mounting sleeve (60, 80) has a cable channel (76, 96) for the energy and/or data line (17).
11. Drill rod according to one of the claims 1 to 10,
    wherein
    the outer pipe (40) of the first rod element (10) and/or the second rod element (11) has a cap (58) that can be opened for access to the energy and/or data line (17).

Images