EP0541942B1 - Tube de forage - Google Patents

Tube de forage Download PDF

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Publication number
EP0541942B1
EP0541942B1 EP92116603A EP92116603A EP0541942B1 EP 0541942 B1 EP0541942 B1 EP 0541942B1 EP 92116603 A EP92116603 A EP 92116603A EP 92116603 A EP92116603 A EP 92116603A EP 0541942 B1 EP0541942 B1 EP 0541942B1
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EP
European Patent Office
Prior art keywords
drill
helix
main body
tube
cylinder
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP92116603A
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German (de)
English (en)
Other versions
EP0541942A1 (fr
Inventor
Heinz Gruber
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
GD-ANKER GmbH
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GD-ANKER GmbH
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Filing date
Publication date
Application filed by GD-ANKER GmbH filed Critical GD-ANKER GmbH
Publication of EP0541942A1 publication Critical patent/EP0541942A1/fr
Application granted granted Critical
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Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E21B17/10—Wear protectors; Centralising devices, e.g. stabilisers
    • E21B17/1078—Stabilisers or centralisers for casing, tubing or drill pipes
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B10/00—Drill bits
    • E21B10/60—Drill bits characterised by conduits or nozzles for drilling fluids
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E21B17/22—Rods or pipes with helical structure

Definitions

  • the invention relates to a drill pipe according to the preamble of claim 1.
  • Drill pipes which are used as lost tools after the drilling as a lost tool, are known in manifold forms. They not only have to be suitable for drilling a hole, but also for the flawless, in particular centric guidance of the drill pipe and for the introduction of a mortar suspension or a comparable hardenable medium.
  • the drilling of the hole involves the guidance of a suitable flushing agent which is matched to the nature of the surrounding mountains or soil and which has to be discharged towards the mouth of the hole as the drilling progresses. Due to the central guidance of the pipe mortared state, the drill pipe is covered as uniformly as possible on all sides by the mortar suspension in order to reliably protect the drill pipe from corrosive influences.
  • the mortar suspension is usually introduced through the drill pipe located in the borehole, the mortar preferably exiting in the area of the drill bit and filling the borehole in the rearward direction, ie in the direction of the borehole mouth.
  • an injection drill anchor is known, which is designed as a smooth rod, at one end of which there is a drill bit and at the other end - with the interposition of a sleeve - a closing section is arranged, which, among other things, as an inflatable packer trained hole closure.
  • the end section ends at the mouth of the bore hole in a spring-loaded check valve, which allows a hardenable medium to flow into the drill anchor, but prevents a backflow process.
  • the said rod carries a conveying helix, the cross section of which is larger than the inflatable packer in the unexpanded state.
  • this drill anchor as a rupture disc inside the sleeve shows, designed for rotating drilling without the use of a flushing agent, so that the conveying helix, among other things, with regard to its pitch is dimensioned according to its function as a funding, a further effect of this helix is seen in the improvement of the anchorage of the drill anchor in the borehole.
  • an injection drill anchor which consists of a tubular base body provided with a longitudinal channel, which has a drill bit on the side of the borehole and radial bores are branched off from the longitudinal channel - in a uniform distribution over the length of the base body.
  • the base body On the outside, the base body carries a helix, which can be produced by welding a wire, but also via a forging process, and on the borehole mouth ends into a diametrically offset threaded section which, in conjunction with an anchor plate and a clamping nut, the axial bracing of the inside of the borehole in mortar or another medium embedded injection drill anchor is used.
  • the purpose of the helix mentioned is to profile the base body in the surface area in order to provide improved integration into a mortar filling the borehole after this anchor has been set.
  • Essential to the invention is accordingly that provided on the outside with a comparatively steep helix Base body that forms the drill pipe, wherein the outer radius of the helix can correspond to the radius of the borehole.
  • This helix fulfills a multiple function. On the one hand, due to its steepness, it ensures a comparatively short flow path for a washing-up liquid loaded with floor particles, as a rule air for cohesive floors, and at the same time supports this conveying process. Furthermore, the wall of the borehole is kept stable or smoothed over the entire length during the drilling progress. After the helix extends over the entire length of the drill pipe, the drill pipe is also subject to reliable support on the walls of the borehole over its entire length and thus to a central guidance.
  • the drill pipe In the case of using the drill pipe in the manner of an injection pipe or injection drill anchor when the mortar or other hardenable medium is introduced into the borehole, the latter ensures uniform all-round coverage of the drill pipe and thus reliable corrosion protection.
  • the radial width of this helix should be at least 10 mm, preferably at least 15 mm. It is essential that the helical surfaces - seen in a cross section of the base body - are always placed tangentially to the contour of the base body, so that the surfaces of the base body and helix which serve to guide the flow are largely free of discontinuities. This ensures that the flushing medium loaded with loosened soil particles is removed properly and is used for reliable embedding in the mortar suspension to be inserted into the borehole.
  • the drill pipe according to the invention is further characterized in that the radial outer dimensions of the helix can be dimensioned slightly larger than those of the drill head, in particular the drill bit.
  • the base body forming the drill pipe can be formed in one piece with the helix according to the features of claim 2 and consist of a cold-formed steel.
  • the base body can thus be a drill pipe provided with a steep helix and smooth in the surface area, the helix also having the function of an anchoring agent within the mortar in addition to the functions already described above.
  • claims 3 and 4 are directed to different embodiments of the helix.
  • This can also be designed as a separate component which is suitably connected to the base body e.g. is connected by welding.
  • the helix can be designed as a hollow body, but also as a full cross section, and in the first case is open on the end face. This means that the interior of the helix is also available for transport operations and is also filled in when the mortar is applied.
  • the features of claim 5 are directed to a special embodiment of the helix. According to this, this is designed as a profile which tapers in cross-section in the radially outward direction, and thus in the simplest case as a triangular profile, the two helical surfaces of which - seen in a cross section of the base body - are attached tangentially to the latter.
  • claims 6 and 7 are directed to a further advantageous embodiment of the base body.
  • this is designed as a tube-like body provided with a thread-like deformation on the inside and outside, this thread preferably being a thread that can also be used for screwing purposes.
  • the features of claim 8 are directed to a special embodiment of a coupling piece, which is used for screwing two drill pipes or base body. It is essential that in the screwed state the two drill pipes always have uniform radial dimensions on the outside, in particular also in the connection area, so that no structures that project on the outside are provided in the connection area, e.g. in the case of a sleeve used to screw in drill pipe ends.
  • the prerequisite for this effect is that the second tubular cylinder mentioned corresponds to the base body in its radial dimensions. If necessary, the latter tube cylinder can also be secured in its central position by spot welding.
  • the features of claim 10 are directed to a variant of the coupling piece insofar as the said second tubular cylinder is in turn also provided with a helix which corresponds in design to the helixes of the base body and continuously connects to the latter in the assembled state.
  • the helix according to the invention starting from the borehole mouth to the bottom of the borehole - extending over the connection area of two base bodies in each case - is equipped with a continuously running helix.
  • the drill pipe according to the invention can be provided with a detachable drill head which can be screwed to the drill pipe. It is essential that the drill head is provided with a special support cylinder which extends over the length of the coupling body mentioned and delimits an annular space which is connected to the central longitudinal bore of the drill head via radially running bores. This means that during drilling the flushing medium emerges from the flushing hole of the drill bit on the one hand, but at the same time exits through the radial bores of the coupling body and the annular space, flows in the backward direction and develops a suction at the end of the coupling body, which supports the removal of the as a result of the progress of drilling of dissolved material.
  • the support cylinder has a stabilizing and shaping effect on the surrounding borehole walls.
  • the support cylinder has an outer diameter, which corresponds at most to the outer diameter of the drill bit, but is preferably made slightly smaller.
  • the support cylinder is in preferably non-detachable connection with the drill bit, can thus be welded to it and is preferably smooth-walled in accordance with the features of claim 13. In addition, its position is stabilized via webs that are firmly connected to the coupling body.
  • the coupling body is designed in accordance with the features of claim 14 to the extent that the threaded section projecting therefrom is intended for screwing into the base body of a drill pipe.
  • claim 15 are advantageous insofar as only functional elements are used in the coupling body that are already used in the coupling part and the base body.
  • These are essentially two tube cylinders of different lengths that can be screwed into one another, of which the longer inner tube forms the threaded section that is intended to be screwed into the facing end of a drill pipe. Both screwed tube cylinders are welded to the drill bit at one end.
  • the radial dimensions of the helix preferably correspond to those of the support cylinder.
  • FIG. 1 in FIG. 1 denotes a drilling head in its entirety.
  • This is provided with an axially short, plate-like drill bit 2, which shows at least one hole 4, the axis of which intersects the longitudinal axis 3 of the drill head or which is at least arranged off-center.
  • This bore 4 fulfills the function of a flushing bore.
  • the drill bit 2 is otherwise provided in a manner known per se with cutting edges 5 or comparable means which extend on the outside or on the bottom of the borehole.
  • tube cylinder 6 with a tube cylinder is designated, which corresponds in its radial dimensions as well as in its wall thickness to the boring bars to be described below and in which a further tube cylinder 7 is inserted.
  • Both tube cylinders 6, 7 consist of cold-rolled steel and are provided with an internal and an external thread, in such a way that the tube cylinder 7, which is smaller in radius, is screwed into the tube cylinder 6.
  • the tubular cylinder 7 also protrudes by a dimension 8 from the tubular cylinder 6 and serves in a manner to be explained for coupling a boring bar.
  • the cavity 9 is otherwise characterized by a series of radially extending bores 11 penetrating the walls of the screwed tubular cylinders 6, 7, the significance of which will be discussed in more detail below.
  • the drill bit 2 protrudes radially from the system of the tubular cylinders 6, 7 and 12 denotes a smooth-walled metal cylinder which is also welded to the drill bit 2 and whose radial dimension 13 essentially corresponds to that of the drill bit 2.
  • the cylinder 12 also extends in the axial direction over a length corresponding to the outer tubular cylinder 6 and is connected to it via webs 14 which are provided on the end region of the tubular cylinder 6 facing away from the drill bit 2.
  • An annular space 15 thus remains between the outside of the tubular cylinder 6 and the inside of the cylinder 12 and the bores 11 mentioned in the introduction open into this annular space 15.
  • the cylinder 12 forms a support cylinder, which will be discussed in more detail below.
  • a flushing agent or a mortar suspension flowing in the direction of the arrow 16 flows on the one hand through the bore 4 in the direction of the arrow 17, but at the same time through the bores 11 and the annular space 15 in Direction of arrows 18.
  • the boring bar 19 shown in FIGS. 2 and 3 is designed as a tubular base body provided with a continuous external and internal thread, which in turn consists of cold-rolled steel. It corresponds in its radial dimensions as well as in its wall thickness to the dimensions of the tubular cylinder 6.
  • the internal thread of the boring bar 19, not shown in FIGS. 2 and 3 is also intended for screwing onto the section of the tubular cylinder 7 protruding from the tubular cylinder 6, so that in the assembled state of the boring bar, the end face of the tubular cylinder 6 bears directly against the facing end face of the boring bar 19.
  • the profile is characterized by two essentially identical legs 21, which are symmetrical with respect to the axial plane 22 and essentially tangential to the cross-sectional contour of the boring bar and are welded to it.
  • the helix has a comparatively large pitch of 1 m to 3 m and is smooth on the outside.
  • the helix 20 extends uniformly over the entire length of the boring bar and the front ends of the helix 20 are open and are available for a flow-through process.
  • the helix 20 can consist of a folded sheet formed with the same material as the boring bar 19.
  • the radius 23 of the helix 20 corresponds approximately to the radius of the drill bit 2 and thus the radius of a borehole. If necessary, the diameter of the helix can also be larger than that of the drill head, up to a value of at most 1.05 times the diameter of the drill bit.
  • the outer radius of the boring bar 19 can be, for example, 15 mm to 20 mm.
  • helix 20 The purpose of the helix 20 will be discussed in more detail below.
  • FIG. 4 denotes a coupling piece in its entirety, which is designed symmetrically with respect to a radial plane 25.
  • the coupling consists essentially of a first tubular cylinder 26, which corresponds to the tubular cylinder 7 of the drill head 1 with regard to its radial dimensions including its internal and external thread, and a second tubular cylinder 27 which corresponds to the tubular cylinder 6 with regard to its internal and external thread and the wall thickness .
  • the tubular cylinder 27 is screwed onto the tubular cylinder 26 and fixed in a central position, for example by spot welding. The ends of the inner tubular cylinder 26 thus protrude symmetrically on both sides from the tubular cylinder 27.
  • the coupling piece 24 is first screwed into the end of the one boring bar, the extension boring bar then being screwed onto the remaining tubular cylinder section 26.
  • the boring bar In the assembled state, ie after screwing the drill head 1 with a boring bar, a coupling piece 24 and an extension boring bar, the boring bar therefore has radially constant dimensions over its entire length, and in particular in the connection area between two boring bars no externally projecting sleeve-like structures are provided.
  • the boring bars are uniformly provided with a continuous thread over their entire length and there is again a continuous bore over the entire length, which is only narrowed in the connection area by the tubular cylinder 26 and which serves to guide a washing-up liquid or a mortar suspension.
  • a coupling piece of the type shown in FIG. 4 can be used not only for connecting an extension boring bar but also for connecting an adapter part for introducing a flushing medium or mortar suspension, and a drilling drive.
  • an injection drill anchor equipped in the above sense which is preferably designed for cohesive soils, it is first used in a manner known per se like a drill rod, air flowing through the central longitudinal bore 10 as a flushing agent.
  • the flushing agent exits axially during the drilling operation on the one hand through the bore 4, in this case takes up the soil particles loosened by the drill bit 2 and then flows around the drill bit 2 and on the outside of the cylinder 12.
  • a part of the scavenging air flows out through the bores 11 into the annular space 15 and, after leaving this annular space, develops a suction at point 26, which supports further production in the direction of the hole opening.
  • the cylinder 12 the outside of the dimensions of the Corresponds to the borehole wall, exerting a stabilizing effect on the latter.
  • the helix 20 extends almost directly to the end of the cylinder 12 facing it and, as drilling progresses, develops a conveying effect on the materials flowing between the inside of the borehole wall and the outside of the drill rods 19 in the direction of the borehole mouth. At the same time the walls of the borehole are smoothed and evened out by the coils and a further effect of the coils is an exact central guidance of the drill rods within the borehole.
  • the cross section of the coils 20 also takes part in the transport of loosened soil materials.
  • appropriate length dimensioning of the sections of the tubular cylinder 26 projecting from the tubular cylinder 27 ensures that the ends of the helical ends 20 of the coils 20, which are open in cross-section, are exactly opposite one another.
  • the tubular cylinder 27 can also be equipped with a corresponding helix element, so that, due to the length dimensioning of the sections mentioned, there is a continuous course of the helix 20 over the entire length of the injection drill anchor composed of several drill rods.
  • the longitudinal borehole 10 is used in a manner known per se for introducing a mortar suspension which continuously fills the borehole - starting in the region of the borehole bottom and progressing towards the borehole mouth.
  • a mortar suspension which continuously fills the borehole - starting in the region of the borehole bottom and progressing towards the borehole mouth.
  • the boring bars are thus due to the central guidance by means of the helix
  • a uniform mortar cover over the entire length of the borehole, which cover is also present within the same due to the hollow helical cross section. This means that there is uniform and reliably effective corrosion protection over the entire length of the injection drill anchor.
  • the radius 23 of the helix 20 is accordingly dimensioned such that with central guidance of the injection boring bar there is a minimum covering on all sides with mortar or a comparable medium, for example a synthetic resin, in a layer thickness of at least 10 mm or 15 mm.
  • an anchor rod according to the invention was explained above in the context of an injection drill anchor consisting of a drill head 1 and various drill rods connected to one another via coupling pieces.
  • Applications are not limited to this, however.
  • compression valves that can be screwed in between two boring bars.
  • Their essential feature are tubular cylinders of the type shown in FIG. 4 with the reference number 27, which are screwed onto a tubular cylinder 26 of smaller diameter at a distance from one another and between which a valve part, which consists of an elastic enveloping body, extends, in a similar manner as in the coupling part 24 end portions of the inner tube cylinder 26 protrude beyond the outer tube cylinder 27 and are designed and designed to be screwed into each facing rod end.

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  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • Environmental & Geological Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Earth Drilling (AREA)
  • Piles And Underground Anchors (AREA)
  • Surgical Instruments (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)
  • Light Guides In General And Applications Therefor (AREA)

Claims (16)

  1. Tube de forage composé d'au moins un corps de base tubulaire à travers lequel s'étend un canal longitudinal continu et qui est pourvu d'une couronne de forage (2), une hélice (20) s'étendant sur toute la longueur du corps de base étant disposée sur la face extérieure de celui-ci,
       caractérisé en ce que :
    - le degré d'inclinaison de l'hélice (20) est de 1 à 3 m pour un rayon extérieur du corps de base de 15 à 20 mm,
    - le diamètre extérieur de l'hélice (20) est au maximum de 1,05 fois le diamètre extérieur de la couronne de forage (2),
    - l'hélice (20) - à partir de la face extérieure du corps de base - présente une largeur radiale de 10 mm au moins et
    - l'hélice (20) - vue dans une coupe transversale du corps de base - est disposée tangentiellement par rapport au contour du corps de base.
  2. Tube de forage selon la revendication 1, caractérisé en ce que le corps de base et l'hélice (20) sont construits d'un seul tenant et se composent d'un acier formé à froid.
  3. Tube de forage selon la revendication 1 ou 2, caractérisé en ce que l'hélice (20) - vue dans une coupe transversale du corps de base - forme un profilé creux, dont les faces frontales sont ouvertes.
  4. Tube de forage selon la revendication 1 ou 2, caractérisé en ce que l'hélice (20) - vue dans une coupe transversale du corps de base - forme un profilé plein.
  5. Tube de forage selon l'une ou l'ensemble des revendications 1 à 4 précédentes, caractérisé en ce que la section de l'hélice (20) se rétrécit dans le sens radial vers l'extérieur.
  6. Tube de forage selon l'une ou l'ensemble des revendications 1 à 5 précédentes, caractérisé en ce que le corps de base est pourvu à l'extérieur d'un profilage continu, qui est de préférence conformé en filet.
  7. Tube de forage selon la revendication 6, caractérisé en ce que le corps de base est également pourvu sur toute sa longueur d'un filet intérieur continu.
  8. Tube de forage selon la revendication 7, caractérisé en ce qu'un raccord (24) servant au raccordement de deux corps de base se compose d'un premier cylindre tubulaire (26), destiné à être vissé dans deux corps de base à relier, sur lequel un second cylindre tubulaire (27) est disposé, de préférence au milieu, de telle sorte que le premier cylindre tubulaire (26) dépasse des deux côtés du second cylindre tubulaire (27) et en ce que le second cylindre tubulaire (27) est pourvu de la même manière que le corps de base d'au moins un filet extérieur.
  9. Tube de forage selon la revendication 8, caractérisé en ce que les sections du premier cylindre tubulaire (26) dépassant du second cylindre tubulaire (27) sont de dimensions telles que, lorsque deux corps de base sont assemblés, les extrémités des hélices (20) correspondantes soient alignées l'une sur l'autre.
  10. Tube de forage selon la revendication 8 ou 9, caractérisé en ce que le second cylindre tubulaire (27) est pourvu d'une hélice (20) dont la structure est adaptée à l'hélice (20) du corps de base et en ce qu'à l'état assemblé les hélices contiguës de l'un des corps de base, dudit cylindre tubulaire (27) et du corps de base qui s'y accorde présentent un parcours sensiblement continu.
  11. Tube de forage selon l'une ou l'ensemble des revendications 1 à 10 précédentes, caractérisé en ce qu'il comporte une tête de forage (1) qui est en liaison amovible avec le corps de base.
  12. Tube de forage selon la revendication 11, caractérisé en ce que :
    - la tête de forage (1) présente une couronne de forage (2) courte, en forme de plaque, avec au moins un trou d'injection en communication avec le canal longitudinal du tube de forage,
    - un corps de raccordement concentrique à l'axe longitudinal (3), qui présente à son extrémité opposée à la couronne de forage (2) une section filetée servant au vissage avec le corps de base, est disposé sur la couronne de forage (2),
    - le corps de raccordement est pourvu d'un trou traversant dans le prolongement du canal longitudinal du corps de base,
    - la couronne de forage (2) présente un plus grand diamètre que le corps de raccordement,
    - un cylindre d'appui, ouvert sur sa face frontale du côté opposé à la couronne de forage (2), est disposé sur celle-ci autour du corps de raccordement en dégageant un espace annulaire (15),
    - le trou du corps de raccordement communique par des trous (11) traversants radiaux avec l'espace annulaire (15) et
    - le cylindre d'appui présente un diamètre extérieur qui correspond au maximum à celui de la couronne de forage (2).
  13. Tube de forage selon la revendication 12, caractérisé en ce que le cylindre d'appui a des parois lisses, est réalisé en métal et se raccorde de préférence en outre au corps de raccordement par des barrettes (14) qui franchissent l'espace annulaire (15).
  14. Tube de forage selon la revendication 12 ou 13, caractérisé en ce que la section filetée du corps de raccordement est déterminée et conçue de façon à se visser dans le corps de base.
  15. Tube de forage selon la revendication 14, caractérisé en ce que :
    - le corps de raccordement se compose de deux cylindres tubulaires (6,7) vissés l'un dans l'autre, le cylindre intérieur (7) dépassant du cylindre extérieur (6) et formant la section filetée destinée au vissage dans le corps de base,
    - les dimensions radiales du cylindre tubulaire intérieur (7) correspondent au premier cylindre tubulaire (26) du raccord (24) et les dimensions radiales du cylindre tubulaire extérieur (6) correspondent au second cylindre tubulaire (27) du raccord (24),
    - les dimensions radiales du cylindre tubulaire extérieur (6) et du second cylindre tubulaire (27) correspondent au corps de base et
    - la longueur axiale du cylindre d'appui correspond sensiblement à celle du second cylindre tubulaire (27).
  16. Tube de forage selon l'une ou l'ensemble des revendications 12 à 15 précédentes, caractérisé en ce que les trous (11) d'orientation radiale débouchant dans l'espace annulaire (15) sont prévus dans une zone du corps de raccordement voisin de la couronne de forage (2).
EP92116603A 1991-11-09 1992-09-29 Tube de forage Expired - Lifetime EP0541942B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4136883A DE4136883C2 (de) 1991-11-09 1991-11-09 Bohrrohr
DE4136883 1991-11-09
SG160994A SG160994G (en) 1991-11-09 1994-11-07 Drill tube

Publications (2)

Publication Number Publication Date
EP0541942A1 EP0541942A1 (fr) 1993-05-19
EP0541942B1 true EP0541942B1 (fr) 1994-07-13

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP92116603A Expired - Lifetime EP0541942B1 (fr) 1991-11-09 1992-09-29 Tube de forage

Country Status (8)

Country Link
US (1) US5388655A (fr)
EP (1) EP0541942B1 (fr)
JP (1) JPH05209489A (fr)
AT (1) ATE108509T1 (fr)
AU (1) AU654585B2 (fr)
CA (1) CA2081681A1 (fr)
DE (1) DE4136883C2 (fr)
SG (1) SG160994G (fr)

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DE19648868A1 (de) * 1996-11-26 1998-05-28 Hilti Ag Bohrwerkzeug mit hohlzylinderförmigem Trägerkörper
DE10035384C2 (de) * 2000-07-20 2002-10-10 Juergen Kretzschmar Verfahren zum Einbringen eines selbstbohrenden Injektionsankers in Böden, sowie Injektionsanker
GB0024909D0 (en) * 2000-10-11 2000-11-22 Springer Johann Drill string member

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Also Published As

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US5388655A (en) 1995-02-14
AU2715592A (en) 1993-05-13
SG160994G (en) 1995-03-17
EP0541942A1 (fr) 1993-05-19
ATE108509T1 (de) 1994-07-15
DE4136883A1 (de) 1993-05-13
AU654585B2 (en) 1994-11-10
JPH05209489A (ja) 1993-08-20
CA2081681A1 (fr) 1993-05-10
DE4136883C2 (de) 1993-10-14

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