EP1010815B1 - Manchette de raccordement pour tube de forage - Google Patents

Manchette de raccordement pour tube de forage Download PDF

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Publication number
EP1010815B1
EP1010815B1 EP99660132A EP99660132A EP1010815B1 EP 1010815 B1 EP1010815 B1 EP 1010815B1 EP 99660132 A EP99660132 A EP 99660132A EP 99660132 A EP99660132 A EP 99660132A EP 1010815 B1 EP1010815 B1 EP 1010815B1
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EP
European Patent Office
Prior art keywords
tube
sleeve
splice
pile
elements
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
EP99660132A
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German (de)
English (en)
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EP1010815A1 (fr
Inventor
Kalle Juhani Thurman
Sami Kalevi Eronen
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.)
Rautaruukki Oyj
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Rautaruukki Oyj
Priority date (The priority date 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 date listed.)
Filing date
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Application filed by Rautaruukki Oyj filed Critical Rautaruukki Oyj
Publication of EP1010815A1 publication Critical patent/EP1010815A1/fr
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Publication of EP1010815B1 publication Critical patent/EP1010815B1/fr
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
    • E21B17/02—Couplings; joints
    • E21B17/08—Casing joints
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/22—Piles
    • E02D5/52—Piles composed of separable parts, e.g. telescopic tubes ; Piles composed of segments
    • E02D5/523—Piles composed of separable parts, e.g. telescopic tubes ; Piles composed of segments composed of segments

Definitions

  • the object of the present invention is a splice in the pile tube of a drilled pile to be driven into the ground and/or rock, comprising successive metal tube elements of a pile tube so that the splice comprises a principally straight metal sleeve inside which the ends of two tube elements acting as extensions for each other are situated.
  • the piles need to endure stresses due to mounting, i.e. penetration into the ground and/or rock, and meet, for example, the requirements in building regulations for compressive and tensile strength, bending stiffness and yield moment. Due to the strength and toughness of steel, steel tube piles endure big vertical and horizontal loads. This makes high requirements for the durability of splices for pile elements. It is usually required that the splice for the pile elements holds as well as the actual pile tube. When the overall length of a pile needed in the target site exceeds the manufacturing length of a single pile tube, driving into the ground is interrupted, the pile is extended, and mounting into the ground is resumed. These stages are repeated in order to provide a sufficient final length for the pile.
  • An extension method for a tube pile generally used is to weld a new pile tube as a direct extension for the previous one so that, in principle, a strong and rigid joint is achieved.
  • welding is a slow and difficult method, and it requires the presence of a professional welder at the site and that the quality is controlled and inspected.
  • a threaded joint between the pile tubes may be used, with a male thread at the one end of a tube element entering the joint, the other pile element end including a suitable female thread so that the ends of each pile element are different, and the elements of the pile tube have to be fastened directly to each other the right side up.
  • a threaded splice otherwise works in a relatively satisfactory way, but the threads weaken the pile tube, and the splice tends to break at the point of the male thread, to which the pile tube with the female thread ends on top of the male thread.
  • the said splices are disclosed in the below-mentioned publication by Sami Eronen and in the brochure of AB Sandvik.
  • the patent US-3 796 057 discloses a sleeve joint which includes a straight sleeve element to be mounted on top of the elements of the pile tube, and a formed element to be placed inside in order to improve the gripping between the tube element and the sleeve.
  • this is not suitable for situations in which, for example, dynamic alternating stress, i.e. both drawing and compression alternately, and possibly rotating force, i.e. torsion, are applied to the pile during drilling,.
  • this joint is problematic, as penetration into the ground causes the pile to bend due to various reasons, such as non-uniformities in the ground. Also the internal elements of the tube make it difficult to at least move the drill bit.
  • Drilling may be accomplished by a pressure hammer lowered to the borehole on top of the drill bit; this is referred to as "down-the-hole hammer” (DTH) drilling, i.e. using down-the-hole drilling equipment; or by a surface pressure hammer as "top-hammer” drilling, i.e. using an overhead driving equipment.
  • DTH down-the-hole hammer
  • top-hammer top-hammer
  • the casing tube for a borehole typically consists of casing tube elements 1 - 3.5 m long, but sometimes even 6 m long, tubes with thick walls which thus have to be extended almost in every case.
  • the sealing surfaces have conical sections or the like, whereupon the male elements move radially outward, as shown by arrows in the figures, against the inner side of the sleeve, for gaining the fluid tightness.
  • the ends of the tubes have protruding extremity zones with front walls, and the sleeve is provided with a pair of inner stop shoulder for regulating the tightening, against which stop shoulders the two bearing surfaces of tube ends abut, whereupon an elastic deformation and a plastic deformation occurs causing a sealing contact.
  • the first object of the present invention is to provide such a joint between successively mounted sections of tube piles that, besides stresses directed at the pile during operating conditions, it also endures well both dynamic stresses during mounting, such as pulsating stress or alternating stress, and torsion, if necessary.
  • the second object of the invention is to provide such a joint which may be produced reliably and firmly under varying conditions on piling sites and, if possible, without requiring special qualifications from workers.
  • the third object of the invention is to provide such a joint which is adapted to be used in ground tube drilling for extending the casing tube, and to be filled with hardening mortar after the drilling, and thus to be used as a concrete-filled tube pile.
  • Fig. 1 presents in side view a finished tube pile achieved by the splices of the invention in the ground, for example in sandy soil, and at least partly surrounded by concrete so that a friction pile supporting itself to the ground is provided.
  • Fig. 2 is a partly cutaway side view of a finished tube pile achieved by the splices of the invention in the ground, and for example, drilled into primary rock so that a pile supporting itself to the rock is provided. At this stage, the tube pile has not yet been filled with concrete.
  • Fig. 3 is a longitudinal section of a splice through the middle line of pile tubes, corresponding to the cutaway section of Fig. 2.
  • the splice of the figure comprises taper threads for the pile tube ends in accordance with Fig. 1, and a sleeve of Fig. 5 with taper threads.
  • Fig. 4 shows at the top of the figure a longitudinal section of a male taper thread at the end of a pile tube entering the splice, as in Fig. 3, the bottom part presenting it in side view.
  • Fig. 5 shows an extension sleeve for the splice of the invention, comprising two internal taper threads beginning at both ends of the sleeve, in longitudinal section as in Fig. 3.
  • the taper threads beginning at opposite ends of the sleeve extend uninterrupted through the sleeve and, at the bottom part of the figure, the taper threads beginning at opposite ends of the sleeve are separated by an opening of the thread bottom in the middle section of the sleeve.
  • the splice is used for connecting the successive tube elements 4a, 4b, 4c, etc. of metal, typically of steel, of a pile tube 2 for a drilled pile driven into the ground M and/or rock K, with each other.
  • the splice 1 comprises a principally straight sleeve 3 of metal, typically of steel, inside which the ends 15, 16 of two tube elements acting as extensions for each other are situated.
  • the sleeve 3 is provided with two female taper threads 5a and 5b, which expand towards the ends 7a, 7b of the sleeve, i.e. the taper threads begin at the sleeve ends and taper towards the centre of the sleeve.
  • Each end of the tube elements 4a, 4b, 4c, etc. includes a end surface 8 and male taper threads 6 corresponding to the sleeve threads, the taper threads 6 tapering towards the said end surface 8, i.e. these taper threads begin at the ends of the tube elements.
  • the end surface 8 of every tube element advantageously extends essentially perpendicularly to the centre line 14 of the tube so that the end surfaces would press evenly against each other.
  • the tube elements adhere to the sleeve by reciprocal gripping of the taper threads 5a and 6; 5b and 6, and the end surfaces 8 of the opposite or successive tube elements 4a and 4b, 4b and 4 c, etc. providing extensions for each other are pressed against each other.
  • a taper thread in the tube elements it is possible to maintain the wall thickness of the tube element big at the end edges 7a, 7b of the sleeve so that the tubes endure stress well also at these critical points.
  • a tensile stress is provided in the sleeve at the same time as compression stress is generated to the taper thread of the tube.
  • the strokes of a pressure hammer are directed at the extension sleeve as load peaks so that tension in the sleeve varies while remaining on the drawing side all the time.
  • the stress varying from tension to compression which is dangerous for the fatigue durability, changes to less dangerous pulsating load.
  • the lowermost tubes are exposed to very high dynamic stresses, as the number of strokes of the pressure hammer may typically be 3000 strokes/minute, and the piling time e.g. 8 hours.
  • the piles carry the prevailing static load in the splice mainly with their end surfaces.
  • the tensile stress to be generated to the sleeve may be accurately controlled on site by providing the tube elements 4a, 4b, 4c, etc. with a marking slot 9 along the external periphery within a distance L2 from the end surface 8 predetermined either by calculation and/or experiment, either edge 11a or 11b of the slot indicating the length Le for the inside angle of rotation times pitch determined in the previous paragraph.
  • the predetermined portion of the sleeve 3 in free space is generated if, for example, the sleeve 3 includes an aperture for observing the marking slot 9 from the outside, and the length L1 of the sleeve is the applicable standard of comparison, if the end edge 7a, 7b of the sleeve is used for observing the marking slot.
  • the correct tensile stress for the sleeve and the correct compression stress for the tube element are thus achieved so that the two tube elements and the sleeve connecting them are turned one within the other until, for example, the end edges 7a and 7b of the sleeve are at a certain predetermined point along the marking slot for the tube elements, such as at the edge 11a or 11b of the marking slot, or at a certain predetermined distance from the marking slot edge 11b farther away from the end surface 8 of the tube element. Due to its elasticity, the sleeve 3 has then stretched so that it is longer than its length L1 in free space, the bigger length generated by deformation corresponding to the said predetermined length Le.
  • the reduction in the distance L2 between the end surface 8 and the marking slot 9 caused by the elasticity of the tube element and the compression directed at the tube element has to be taken into account, when necessary.
  • the bottom diameter D1 of the marking slot is equivalent to or bigger than the biggest inner diameter D2 of the taper thread 6 of the tube element, the wall thickness of the tube material remains big enough at the point of the marking slot so that the tube element 4a, 4b, 4c, etc. is not vulnerable to fracture at this point, either.
  • the large inner diameter D2 refers to the last bottom diameter of the thread found at the thick end of the thread before the end of the taper thread.
  • the taper thread 6 Between the end surface 8 of the tube element 4a, 4b, 4c, etc. and the taper thread 6 there is a principally cylindrical guide section 10, the outer diameter D3 of which is at most equivalent to the smallest inner diameter D4 of the taper thread 6 of the tube element, and further, there is a provided a transitional bevel 12 between the guide section 10 and the male thread.
  • This design guides the external taper thread 6 of the tube element easily and accurately to the internal taper thread 5a and 5b, respectively, of the sleeve.
  • the taper thread thus begins from the short guide surface 10 at the end of the tube, the diameter of which is smaller than the thread, and ends to the shallow slot 9 on the surface.
  • the pile tube Upon mounting, the pile tube is turned to the sleeve as far as the surface slot so that it is then known that the end surfaces 8 of the tube element ends are in contact and pressed against each other, and that the afore-mentioned stress state exists in the elements.
  • the two female threads 5a, 5b of the sleeve 3 both extend to the middle area C of the sleeve length, or near the middle area C, in which the smallest inner diameter D4 of the sleeve is bigger than the outer diameter D3 of the guide section 10 of the tube element ends, making it thus possible for the end surfaces 8 to penetrate sufficiently deep through the sleeve and get into contact with each other.
  • the taper threads 5a and 5b of the sleeve may extend through the sleeve as a continuous and unbroken thread, as is shown at the upper part of Fig. 5; or the taper threads 5a and 5b may be separated from each other by the bottom opening 17 of the thread, as is shown at the lower part of Fig. 5. Both ends of the sleeve are further provided with external peripheral bevels 13 which reduce the resistance of the pile tube as the tube is driven forward into the ground M and/or rock K.
  • the thread length L3 of the male taper thread 6 of the tube element from the end surface 8 to the edge 11a nearer the end surface of the marking slot 9 typically is smaller than half of the thread length of the female taper thread 5a, 5b of the sleeve, i.e. 1 ⁇ 2L1 from the end surface 7a and 7b to the middle C of the sleeve.
  • the thread length L3 of the male taper thread 6 from the end surface 8 to the edge 11 farther away from the end surface of the marking slot 9 again is essentially as big as half the thread length of the female taper thread 5a, 5b of the sleeve, i.e. 1 ⁇ 2L1 from the end surface 7a and 7b of the sleeve to the middle C of the sleeve.
  • Drilled pile tubes 2 driven into the ground M and/or rock K are usually filled with concrete B consisting of hydraulically hardening binding agent, water, filler material principally of rock material, and possible additives.
  • the drilled pile may also not be filled with concrete, as can be seen in Fig. 2.
  • auxiliary reinforcements are arranged inside the drilled pile tube 2, which adhere to the hardening concrete B and the tube elements 4a, 4b, 4c, etc. of the drilled pile tube.
  • Concrete B may be injected through the pile tube so much that it rises up the outer surface to surround the pile, as is shown in Fig. 1.
  • concrete may also be fed through the pile and further to its outer surface during drilling.
  • the outer diameters of the drilled piles may be, for example, 75 - 300 mm, and typically the outer diameters of drilled pile tubes are 130 - 220 mm. Because of the method, it is difficult to drill very small tubes into the ground, and big drilled pile tubes again are expensive.
  • the drilled pile tubes may be welded or seamless tubes.
  • the minimum wall thickness is 5 mm, typically 6 - 12 mm.
  • the wall thickness of the sleeve 3 is approximately the same as or slightly bigger than that of the tube elements 4a, 4b, etc. along the pile tube.
  • the sleeves are made of seamless tube or similar material.
  • the taper angle ⁇ of the taper threads 5a, 5b and 6 is 1° - 10°. For example, with a taper angle of 3°, the convergence is about 10 mm at a taper length of 100 mm.
  • a drill bit 20 with a larger diameter than the pile tube 2, or a similar working ring 20, may be left at the point of the pile tube.
  • a stronger tube element without a ring may also be welded to the point of the tube.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Geology (AREA)
  • Structural Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Civil Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Physics & Mathematics (AREA)
  • Paleontology (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Piles And Underground Anchors (AREA)
  • Earth Drilling (AREA)
  • Drilling Tools (AREA)
  • Toys (AREA)
  • Paper (AREA)
  • Laminated Bodies (AREA)
  • Magnetically Actuated Valves (AREA)
  • Adhesive Tapes (AREA)
  • Magnetic Heads (AREA)
  • Suspension Of Electric Lines Or Cables (AREA)
  • Branch Pipes, Bends, And The Like (AREA)

Claims (9)

  1. Procédé de réalisation d'un raccordement sur un tube (2) comprenant des éléments de tube métalliques successifs (4a, 4b, 4c, ...), les extrémités (15, 16) des éléments de tube pour les raccordements étant pourvues de surfaces d'extrémité (8) et de filetages coniques mâles (6) qui diminuent de diamètre vers les surfaces d'extrémité respectives, et des manchons métalliques sensiblement droits (3), ces manchons étant pourvus de deux filetages coniques femelles (Sa et 5b) qui augmentent de diamètre vers les bords d'extrémité (7a, 7b) du manchon, procédé dans lequel :
    les extrémités de deux éléments de tube (4a et 4b, 4b et 4c, etc.) faisant office de rallonges l'un de l'autre sont placées à l'intérieur d'un manchon pour un raccordement,
    le raccordement est serré par rotation, lors de laquelle les éléments de tube sont fixés au manchon par venue en prise réciproque des filetages coniques (Sa et 6 ; 5b et 6) et les surfaces d'extrémité (8) des éléments de tube opposés (4a, 4b, 4c, ...) sont serrées l'une contre l'autre,
    caractérisé par le fait qu'en outre, le tube étant un tube de pile (2) d'une pile de forage à enfoncer dans un sol et/ou une roche,
    les éléments de tube sont pourvus à leur périphérie extérieure d'une fente de marquage (9) qui est située à une distance déterminée (L2) de la surface d'extrémité (8) des éléments de tube,
    les deux éléments de tube (4a et 4b, 4b et 4c, etc.) et le manchon (3) qui les réunit sont tournés les uns dans l'autre d'angles de rotation (R1 et R2) jusqu'à ce que les bords d'extrémité (7a et 7b) ou les orifices du manchon soient à un point déterminé par rapport à la fente de marquage (9) des éléments de tube,
    pour la production d'une contrainte de traction déterminée pour le manchon et d'une contrainte de compression déterminée pour les éléments de tube.
  2. Procédé selon la revendication 1, caractérisé par le fait que les deux éléments de tube et le manchon sont tournés les uns dans l'autre jusqu'à ce que le produit de la somme des angles de rotation à l'intérieur (R1, R2) par le pas () des filetages (Le = (R1 + R2) x ) à l'état libre soit supérieur à la longueur (L1) du manchon, ou de sa partie déterminée à l'état libre, pour la production de la contrainte de traction dans le manchon.
  3. Procédé selon l'une des revendications 1 et 2, caractérisé par le fait que les fentes de marquage périphériques extérieures (9) sont prévues à une distance (L2) de la surface d'extrémité (8) de la partie de tube (4a, 4b, 4c, ...), un bord (11a ou 11b) de la fente de marquage indiquant une longueur déterminée (Le) pour le produit de la somme des angles de rotation à l'intérieur (R1, R2) par le pas () des filetages de l'élément de tube.
  4. Procédé selon l'une des revendications 1 et 2, caractérisé par le fait qu'entre les deux filetages femelles (5a, 5b) du manchon est prévue une zone centrale (C) ayant un diamètre intérieur minimal (D4) qui est supérieur au diamètre extérieur (D3) d'une partie de guidage sensiblement cylindrique (10) prévue entre la surface d'extrémité (8) et le filetage conique (6) de l'élément de tube, pour assurer le contact et le serrage mutuel des surfaces d'extrémité (8) des deux éléments de tube (4a et 4b, 4b et 4c, etc.) du raccordement.
  5. Procédé selon l'une des revendications 1 à 4, caractérisé par le fait que les surfaces d'extrémité (8) de chaque élément de tube sont sensiblement perpendiculaires à l'axe (14) du tube pour assurer un serrage égal des surfaces d'extrémité l'une contre l'autre.
  6. Raccordement sur un tube (2) comprenant des éléments de tube métalliques successifs (4a, 4b, 4c, ...), ce raccordement comprenant un manchon métallique sensiblement droit (3) qui comporte deux filetages coniques femelles (5a et 5b) qui augmentent de diamètre vers les extrémités (7a, 7b) du manchon, et des extrémités de deux éléments de tube (4a et 4b, 4b et 4c, etc.) ayant chacun une surface d'extrémité (8) et des filetages coniques mâles (6) correspondant aux filetages du manchon et diminuant de diamètre vers la surface d'extrémité (8), les filetages coniques (5a et 6 ; 5b et 6) des éléments de tube et du manchon étant mutuellement en prise et les surfaces d'extrémité (8) des éléments de tube opposés étant serrées l'une contre l'autre, caractérisé par le fait que le tube est un tube de pile (2) d'une pile de forage à enfoncer dans un sol et/ou une roche, et qu'à une certaine distance (L2) de la surface d'extrémité (8), les parties de tube (4a, 4b, 4c, ...) comprennent une fente de marquage périphérique extérieure (9) dont un bord (11a ou 11b) indique une longueur déterminée (Le) pour le produit de la somme des angles de rotation à l'intérieur (R1, R2) par le pas () des filetages.
  7. Raccordement selon la revendication 6, caractérisé par le fait que le produit de la somme des angles de rotation à l'intérieur (R1, R2) par le pas () des filetages ((R1 + R2) x ) est supérieur à la longueur (L1) du manchon, ou de sa partie déterminée à l'état libre, pour la production d'une contrainte de traction dans le manchon.
  8. Raccordement selon la revendication 6, caractérisé par le fait que le diamètre de fond (D1) de la fente de marquage (9) est égal ou supérieur au diamètre intérieur maximal (D2) du filetage conique mâle (6) de l'élément de tube.
  9. Raccordement selon la revendication 6, caractérisé par le fait que le diamètre intérieur (D4) du manchon dans la zone centrale (C) de sa longueur est supérieur au diamètre extérieur (D3) d'une partie de guidage sensiblement cylindrique entre la surface d'extrémité (8) et le filetage conique (6) de l'élément de tube, et que les surfaces d'extrémité (8) de chaque élément de tube sont sensiblement perpendiculaires à l'axe (14) du tube.
EP99660132A 1998-12-18 1999-08-23 Manchette de raccordement pour tube de forage Expired - Lifetime EP1010815B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI980570U 1998-12-18
FI980570U FI3931U1 (fi) 1998-12-18 1998-12-18 Porapaalun jatkoliitos

Publications (2)

Publication Number Publication Date
EP1010815A1 EP1010815A1 (fr) 2000-06-21
EP1010815B1 true EP1010815B1 (fr) 2003-05-21

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EP99660132A Expired - Lifetime EP1010815B1 (fr) 1998-12-18 1999-08-23 Manchette de raccordement pour tube de forage

Country Status (8)

Country Link
EP (1) EP1010815B1 (fr)
AT (1) ATE241047T1 (fr)
DE (1) DE69908068T2 (fr)
DK (1) DK1010815T3 (fr)
EE (1) EE04556B1 (fr)
FI (1) FI3931U1 (fr)
NO (1) NO319923B1 (fr)
PL (1) PL192011B1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3048202A1 (fr) 2015-01-23 2016-07-27 Scandia Steel Förvaltning AB Pieu cylindrique et un élément d'extension de pieu cylindrique

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI125990B (fi) * 2009-05-29 2016-05-13 Rautaruukki Oyj Paalu
AT12766U1 (de) 2011-09-08 2012-11-15 Remtech Bohrtechnik Gmbh Verfahren und vorrichtung zum bohren, insbesondere schlag- oder drehschlagbohren, von löchern in boden- oder gesteinsmaterial sowie verbindungselement für ein bohrgestänge
DE102016014647B4 (de) * 2016-12-08 2019-03-14 Alois Hobmaier Rammmuffe, Schlagmuffe, gewindelose Rohrverbindung, schlagfeste Muffe, Schnellbaumuffe, Brunnenmuffe

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE795205A (fr) 1972-02-10 1973-05-29 Atlas Copco Ab Procede et appareillage pour le forage rotatif
US3796057A (en) 1972-05-15 1974-03-12 Apf Corp Pile splicer with retaining means
FR2468823A1 (fr) * 1979-10-30 1981-05-08 Vallourec Joint pour tubes destine a l'industrie petroliere
US4962579A (en) * 1988-09-02 1990-10-16 Exxon Production Research Company Torque position make-up of tubular connections
US5411301A (en) * 1991-06-28 1995-05-02 Exxon Production Research Company Tubing connection with eight rounded threads
FR2733570B1 (fr) * 1995-04-28 1997-06-20 Vallourec Oil & Gas Assemblage filete pour tubes

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3048202A1 (fr) 2015-01-23 2016-07-27 Scandia Steel Förvaltning AB Pieu cylindrique et un élément d'extension de pieu cylindrique

Also Published As

Publication number Publication date
NO996304D0 (no) 1999-12-17
EP1010815A1 (fr) 2000-06-21
PL335558A1 (en) 2000-06-19
ATE241047T1 (de) 2003-06-15
FI3931U1 (fi) 1999-04-22
DK1010815T3 (da) 2003-09-15
NO996304L (no) 2000-06-19
FIU980570U0 (fi) 1998-12-18
NO319923B1 (no) 2005-10-03
DE69908068T2 (de) 2004-03-18
PL192011B1 (pl) 2006-08-31
EE9900495A (et) 2000-08-15
EE04556B1 (et) 2005-10-17
DE69908068D1 (de) 2003-06-26

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