EP2915949A1 - Drilling tool - Google Patents

Abstract

Boring tool (1) comprising at least two boring bars (2), each boring bar (2) having a coaxial pin (4) and a coaxial receiving opening (6) for receiving the pin (4) of an adjacent boring bar (2), the pins (4) each positively engage in the receiving openings (6) and transmit a torque, and wherein each two adjacent drill rods (2) are locked together, wherein at one end (5) of each drill rod (2) in the peripheral region thereof at least one bolt ( 13) about a radially to the longitudinal central axis (14) of the boring bars (2) and at a distance (a) extending to the same axis (15) is pivotally mounted together after joining two boring bars (2) and after locking them together with free end (39) of the bolt (13) integrally formed lateral projections (40) in a longitudinal groove (16) of the one end (5) of the drill rod (2) and in a congruent slot (17) of the other Ren end (7) of the drill rod (2) engages positively and the drill rods (2) secures in the axial direction.

Description

The invention relates to a drilling tool consisting of at least two longitudinally successively arranged, joinable drill rods, each drill rod having at one end a coaxial pin and at its other end a coaxial receiving opening for receiving the pin of an adjacent drill rod, wherein the cross sections of the pin and the receiving openings are formed such that the pins each engage positively in the receiving openings and transmit a torque, and wherein each two adjacent boring bars are locked together after assembly.

Such drilling tools are used for example in civil engineering, mining, tunneling, etc., for example for the production of wells with relatively large depths. For this purpose, a plurality of drill rods is successively arranged one behind the other and connected to each other so that axial tensile loads and torques can be transmitted.

In many such drilling tools, there is a risk that during the rotating retraction of the same individual drill rods are separated from each other and lost irrecoverable in the earth hole.

From the DE 200 17 358 U1 For example, a rotary drill pipe from longitudinally channeled, releasably available drill rods with circumferential coils known. Each of the drill rods has at one end a polygonal pin with a transversely displaceable therein against the restoring force of a spring snap pin and at the other end a polygonal pin adapted polygonal receptacle with an opening in the wall of the drill rod. To create a drill pipe in which the connection of the drill rods is secured even with rotating withdrawal of the drill rods, the snap pin is provided at the radially outer end with a circumferential groove and the wall thickness in the region of the aperture matched to the width of the groove on the snap pin.

By piercing the drill rods piercing pin provision of a central flushing hole is hardly possible in the aforementioned rotary drill pipe, as the rinse over the polygonal pin penetrating transverse bore and provided in the boring holes openings to the outside and thus not provided on the intended rinsing agent outlet of the drilling tool a necessary flushing pressure would become.

The invention has for its object to provide a drilling tool of the specified type, in which the risk of loosening and lost individual drill rods is excluded in the rotating withdrawal from the respective well bore and in which the possibility of providing a central flushing hole is given.

This object is achieved by a drilling tool with the characterizing features of claim 1.

Advantageous developments of the invention are characterized in the subclaims.

In the drilling tool according to the invention, at least one latch is pivotably mounted at one end of each drill rod in the peripheral region thereof about a radially extending to the longitudinal center axis of the drill rods and at a distance from the same. The bolt engages after joining two boring bars and after locking the same together with integrally formed at the free end of the bolt lateral lugs in a longitudinal groove of one end of the drill rod and in a congruent slot of the other end of the drill rod form fit and secures the drill rods in the axial direction. The arrangement of the bolt in the peripheral region of the drill rods allows the provision of a central flushing hole in the individual drill rods, which also ensures a seal in the transition region from one drill rod to the other drill rods. By completely immersing the bolt after pivoting the same in the groove and the then axially parallel position of the bolt, a release of the connection is excluded.

For pivotal mounting of the substantially T-shaped bolt of the same protrudes with the free end of its long web in a portion of the adjoining the pin, the outer circumference of the pin superior cylindrical base body of the drill rods extending groove and is one of the sides the groove penetrating bearing pin held in the radial direction to the bearing pin. The free end of the long web of the substantially T-shaped bolt has a same to the pivot axis or to the bearing bore in the same for the bearing pin rounding, which ensures the pivoting of the bolt in the groove.

On the free upper side of the engaging in the groove substantially T-shaped bolt, an opening of a radial bore for insertion of an unlocking tool may be provided a cylindrical rod can be. By unlocking an opening or pivoting of the bolt from the locking position is guaranteed at any time in the unlocked position.

Between the sides of the long web of the substantially T-shaped bolt and the adjoining the sides of the long web sides of the transverse, the two sides of the long web superior web of the substantially T-shaped bolt each formed an acute angle be. This design ensures that in particular the substantially T-shaped slot in the other end of the drill rod or the sides of the longitudinal slot part remain or be held in position and this does not open by the forces occurring.

In the subsequent from the side of the long web sides of the transverse web of the substantially T-shaped bar facing away from the transverse web can be used in a longitudinal central bore of the substantially T-shaped bolt a resilient thrust piece, the ball after the Lock into a recess in the substantially T-shaped groove snaps. The resilient thrust piece with its ball and the depression in the transverse groove portion of the substantially T-shaped groove increase the security against unintentional opening or pivoting of the bolt from the locking position to the unlocked position.

Hereinafter, a preferred embodiment of the drilling tool according to the invention, wherein the drill rods of the drilling tool are shown without outer spiral or such drilling means in the drawing for simplicity, explained in more detail.

Fig. 1

gesprengt dargestellt in Perspektive den Verbindungsbereich zweier benachbarter Bohrstangen,

Fig. 2

perspektivisch den Verbindungsbereich der zwei benachbarten Bohrstangen mit komplett montiertem Riegel vor dem Zusammenfügen,

Fig. 3

in Perspektive den Verbindungsbereich der zwei benachbarten Bohrstangen nach dem Zusammenfügen mit noch geöffnetem Riegel,

Fig. 4

perspektivisch den Verbindungsbereich der zwei benachbarten Bohrstangen nach dem Zusammenfügen mit geschlossenem Riegel,

Fig. 5

das eine Ende einer Bohrstange mit dem Zapfen und der im Wesentlichen T-förmigen Nut ohne Riegel in perspektivischer Darstellung,

Fig. 6

eine Ansicht in Richtung des Pfeiles VI in Fig. 5 ,

Fig. 7

eine Ansicht in Richtung des Pfeiles VII in Fig. 6 ,

Fig. 8

perspektivisch das andere Ende einer Bohrstange mit der koaxialen Aufnahmeöffnung und dem im Wesentlichen T-förmigen Schlitz,

Fig. 9

eine Draufsicht auf das andere Ende der Bohrstange mit der koaxialen Aufnahmeöffnung und dem im Wesentlichen T-förmigen Schlitz,

Fig. 10

eine perspektivische Darstellung des im Wesentlichen T-förmigen Riegels und

Fig. 11

eine Ansicht in Richtung des Pfeiles XI in Fig. 10 .

Show it

Fig. 1

blown up in perspective the connecting area of two neighboring drill rods,

Fig. 2

in perspective, the connecting area of the two adjacent boring bars with completely assembled bar before joining,

Fig. 3

in perspective the connecting area of the two adjacent boring bars after joining with the bar still open,

Fig. 4

in perspective, the connecting region of the two adjacent boring bars after joining with closed latch,

Fig. 5

the one end of a drill rod with the pin and the substantially T-shaped groove without bolt in perspective,

Fig. 6

a view in the direction of the arrow VI in Fig. 5 .

Fig. 7

a view in the direction of arrow VII in Fig. 6 .

Fig. 8

in perspective, the other end of a boring bar with the coaxial receiving opening and the substantially T-shaped slot,

Fig. 9

a plan view of the other end of the drill rod with the coaxial receiving opening and the substantially T-shaped slot,

Fig. 10

a perspective view of the substantially T-shaped bolt and

Fig. 11

a view in the direction of the arrow XI in Fig. 10 ,

The Fig. 1 to 4 shows simplified a section of a drilling tool 1 for creating in particular earth drilling in civil engineering, mining, tunneling, etc. .. In this case, the drilling tool 1 sets off at least two longitudinally successively arranged, joinable and detachable drill rods 2 together. Of course, for very deep earth bores, more than just two boring bars 2 constitute the boring tool 1.

Each boring bar 2 is made of a cylindrical base body 3, a pin 4 remote from the cylindrical base body 3 at one end 5 of the boring bar 2, a receiving opening 6 in the cylindrical base body 3 at the other end 7 of the boring bar 2 and one, for example, over its entire length of the cylindrical base body 3 extending outer spiral (not shown for simplicity) formed.

The pin 4 (see in particular Fig. 5 to 7 ) and the pin 4 of an adjacent drill rod 2 receiving bore 6 (see in particular 8 and 9 ) or their cross-sections are substantially preferably designed such that the pins 4 each engage positively in the receiving bores 6 and transmit a torque. In Fig. 1 and 2 and 5 to 9 , the pin 4 and the receiving bore 6 are shown in cross-section as a hexagon, for example, but the cross-sectional shape can also be another polygonal, for example, a four- or octagonal, or even a different geometric shape. In a less preferred and not shown embodiment, the pin 4 and the receiving bore 6 each have a cylindrical cross-sectional shape and each be provided with a thread.

The boring bars 2 can each have a same longitudinally penetrating flushing bore 8. For sealing in the transition region from a drill rod 2 to the other drill rod 2 is in a circumferential groove 9 in a remote from the hexagonal cylindrical part 10 at the end 11 of the pin 4 (see Fig. 5 to 7 ) A sealing ring (not shown) is used, in a relation to the hexagon of the receiving bore 6 offset bore 12 (see Fig. 9 ) of the respectively adjacent drill rod 2 seals.

To secure two adjacent drill rods 2 in the axial direction of the same after their joining together are locked. For this purpose, at one end 5 of each drill rod 2 in the peripheral region thereof, more precisely in the peripheral region of the cylindrical base body 3, at least one substantially T-shaped bolt 13 about a radially extending to the longitudinal center axis 14 of the drill rods 2 and at a distance to the same axis pivoted. After joining two boring bars 2 and after locking the same with each other, ie, after pivoting the T-shaped bolt 13 from an unlocking position (bolt 13 is substantially radially to the longitudinal central axis 14 of the drill rod 2 from - see Fig. 3 ) in the locking position (bolt 13 is parallel to the longitudinal central axis 14 of the drill rod 2 - see Fig. 4 ), engages the T-shaped latch 13 in a longitudinal T-shaped groove 16 of the one end 5 of the drill rod 2 and in a congruent T-shaped slot 17 of the other end 7 of the drill rod 2 a form-fitting and secures the drill rods 2 in the axial Direction.

In the figures, only one bolt 13 is shown. But it is quite possible to provide two bars 13, which are then arranged offset by 180 ° to each other on the circumference of the cylindrical base body 3. In the case of drill rods 2, which have cylindrical basic bodies 3 with larger diameters, three or four bars 13, which are preferably distributed uniformly on the circumference of the cylindrical basic body 3, can certainly also be provided as required.

For pivotal mounting of the T-shaped bolt 13 of the same projects with the free end 18 of its long web 19 in a portion 20 of the adjoining the pin 4, the outer periphery of the pin 4 superior cylindrical base body 3 of the drill rods 2 extending groove 16 and is one of the pages 21 of the longitudinal portion 22 of the groove 16 penetrating bearing pin 23 is held in the radial direction to the bearing pin 23. The free end 18 of the long web 19 of the T-shaped bolt 13 has a same to the pivot axis 15 and the bearing bore 24 in the same for the bearing pin 23 coaxial rounding 25 (see Fig. 1 and 10 ), which allows a proper pivoting of the bolt 13 within the groove 16.

Between the sides 26 of the long web 19 of the T-shaped bolt 13 and the adjoining the sides 26 of the long web 19 sides 27 of the transverse, the two sides 26 of the long web 19 superior web 28 of the T-shaped bolt thirteenth in each case an acute angle α is formed (see in particular Fig. 11 ), which ensures that the T-shaped slot 17 in the other end 7 of the boring bar 2 or the sides 29 of the longitudinal slot portion 30 remain in their position and this does not open by the forces occurring.

For additional assurance of the T-shaped latch 13 in the locking position is in the side adjacent to the sides 26 of the long web 19 sides 27 of the transverse web 28 of the T-shaped bolt 13 side 31 of the transverse web 28 in a longitudinal center bore 32 of the T-shaped bolt 13 is a resilient pressure piece 33 is inserted (see Fig. 1 ), the ball 34 engages after locking in a recess 35 in the T-shaped groove 16.

For simplified and quick opening or pivoting of the bolt 13 from the locking position to the unlocking position, an opening 37 of a radial bore 38 for inserting an unlocking tool (not shown) is provided on the free top 36 of the T-shaped bolt 13 engaging in the groove 16. intended. The unlocking tool can be a simple cylindrical rod.

The in Fig. 1 to 4 as well as 10 and 11 shown substantially T-shaped latch 13 is in its illustrated form only one embodiment thereof. The bolt 13 may well be formed or shaped quite differently, in particular preferably integrally formed on the free end 39 of the bolt 13 side Lugs 40, which form an abutment here.

Claims (7)

Drilling tool (1) comprising at least two longitudinally successive, assembled drill rods (2), each drill rod (2) at one end (5) a coaxial pin (4) and at its other end (7) has a coaxial receiving opening ( 6) for receiving the pin (4) of an adjacent boring bar (2), wherein the cross-sections of the pins (4) and the receiving openings (6) are formed such that the pins (4) each engage positively in the receiving openings (6) and transmit a torque, and wherein in each case two adjacent boring bars (2) can be locked together after being joined,
characterized,
in that at the one end (5) of each boring bar (2) in the peripheral area thereof at least one bar (13) is pivotably mounted about an axis (15) extending radially to the longitudinal center axis (14) of the boring bars (2) and at a distance (a) from the same is, after joining two drill rods (2) and after locking the same together with each other at the free end (39) of the bolt (13) integrally formed lateral projections (40) in a longitudinal groove (16) of one end (5) of the drill rod (2) and in a congruent slot (17) of the other end (7) of the drill rod ( 2) engages positively and the drill rods (2) secures in the axial direction. Drilling tool according to claim 1,
characterized,
that for the pivotable mounting of the substantially T-shaped bolt (13) the same with the free end (18) of its long web (19) in a portion (20) of the one to the pin (4) subsequent, the outer periphery the journal (4) protruding cylindrical base body (3) of the boring bars (2) extending groove (16) and held by one of the sides (21) of the groove (16) penetrating bearing pin (23) in the radial direction to the bearing pin (23) is. Drilling tool according to claim 1 or 2,
characterized,
in that the free end (18) of the long web (19) of the essentially T-shaped bolt (13) has a rounding (25) coaxial with the pivot axis (15) thereof or with the bearing bore (24) in the same for the bearing bolt (23) ) having. Drilling tool according to one of claims 1 to 3,
characterized,
that engaging on the free upper side (36) of the groove (16) formed in the substantially T-shaped bolt (13) is provided an opening (37) a radial bore (38) for inserting an unlocking tool. Drilling tool according to claim 4,
characterized,
that the unlocking tool is a cylindrical rod. Drilling tool according to one of claims 1 to 5,
characterized,
that between the sides (26) of the long web (19) of the substantially T-shaped bolt (13) and the sides (27) of the transverse web (27) adjoining the sides (26) of the long web (19), the two sides (26) of the long web (19) projecting web (28) of the substantially T-shaped bolt (13) each have an acute angle (α) is formed. Drilling tool according to one of claims 1 to 6,
characterized,
in that the side (31) of the transverse web (28) facing away from the side (27) of the transverse web (28) of the substantially T-shaped bar (13) adjoining the sides (26) of the long web (19). a resilient pressure piece (33) is inserted in a longitudinal center bore (32) of the essentially T-shaped bolt (13), the ball (34) of which is locked in a depression (35) in the substantially T-shaped groove (16 ) engages.

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