EP1279793B1 - Tête de forage - Google Patents

Tête de forage Download PDF

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Publication number
EP1279793B1
EP1279793B1 EP02015007A EP02015007A EP1279793B1 EP 1279793 B1 EP1279793 B1 EP 1279793B1 EP 02015007 A EP02015007 A EP 02015007A EP 02015007 A EP02015007 A EP 02015007A EP 1279793 B1 EP1279793 B1 EP 1279793B1
Authority
EP
European Patent Office
Prior art keywords
drill head
nose
accordance
drill
approximately
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
EP02015007A
Other languages
German (de)
English (en)
Other versions
EP1279793A1 (fr
Inventor
Alexander J. Verstraeten
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.)
Beheersmaatschappij Verstraeten BV
Original Assignee
Beheersmaatschappij Verstraeten BV
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
Publication date
Application filed by Beheersmaatschappij Verstraeten BV filed Critical Beheersmaatschappij Verstraeten BV
Publication of EP1279793A1 publication Critical patent/EP1279793A1/fr
Application granted granted Critical
Publication of EP1279793B1 publication Critical patent/EP1279793B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
    • E02D5/36—Concrete or concrete-like piles cast in position ; Apparatus for making same making without use of mouldpipes or other moulds
    • 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
    • E21B7/00—Special methods or apparatus for drilling
    • E21B7/26—Drilling without earth removal, e.g. with self-propelled burrowing devices
    • 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
    • E21B10/44—Bits with helical conveying portion, e.g. screw type bits; Augers with leading portion or with detachable parts

Definitions

  • the invention relates to a drill head for a drill for manufacture of boreholes with displacement of the soil with a threaded core, which is of a larger diameter at its rear Continuously helical end to a tip at its front end tapered so that the outer circumference of the thread core in cross section seen a stepped contour with horizontal and vertical Forms step surfaces.
  • Such a drill is known from DE 29 36 060 C2.
  • the drill head can be detachably attached to a drill pipe.
  • the drill head is as Hollow body formed and carries a collar on the back, in which the Drill pipe can be inserted with its front end.
  • the core surrounding the drill head continuously re-threads pressed outside, the displacement forces with increasing Increase the diameter of the drill head.
  • power losses occur because the soil with increasing basic voltage in an area with lower basic voltage dodging. This phenomenon is also known as "slip".
  • An alternative drill is known from DE 32 35 118 A1.
  • the drill head has a discontinuous helical step with a square Cross-section that is on the outer catch of the thread core.
  • the nose provided according to the invention is used when screwing in the Drill head into the soil through the inclined surface of the nose one after Force directed above, which generates the slip described above reduced. This allows drilling to be carried out faster and higher Drilling performance is possible.
  • the nose extends continuously from the area of the rear end of the drill head to in the area of the top. This will along the largest possible Screw length of the drill head generates the upward force.
  • the radial extension is the nose about 1 to 5% of the maximum diameter of the thread core. This ensures that the reduction of Slips is ensured, however, that the nose is too large due to radial Expansion no other negative effects on the drilling process causes.
  • the radial extension of the nose may be preferred 10 to 20 mm, in particular approximately 15 mm.
  • the ratio of radial to axial extension of the nose can be about 2: 1. Such training has positive results in test trials shown.
  • a helically surrounding rib is provided at the end of the drill head be that does not overlap with the nose.
  • the earth drill shown in Figs. 1 and 2 consists essentially from a drill pipe 1 and a single drill head 2.
  • the drill head 2 is a metallic hollow cone body with a thread core that extends from a larger diameter at its rear end to a point continuously tapering its front end so that the outer circumference of the thread core seen in cross section a step-shaped Contour with horizontal step surfaces 12 and vertical step surfaces 14 forms.
  • the metallic hollow cone body also has one helical inside so that it turns to the height of the turns has the same wall thickness everywhere. The only exception is the open top cone base, which has a larger wall thickness.
  • the reinforced cone base is provided with teeth 3, the gaps between the teeth 3 with the interior and the base opening of the Hollow cone body in connection.
  • the upper edge of the collar 5 has an inner bevel 7.
  • the Inner wall of the hollow cone body thus formed is with stiffening ribs Mistake.
  • the apex angle a of the drill head 2 designed in this way is approximately 50 up to 60 °.
  • one is continuous on the outer circumference of the thread core helically encircling nose 16 is provided, the underside 18 seen in cross section flush with the adjacent horizontal step surface 12 connects.
  • the top 20 of the nose 16 forms the bottom 18 an acute angle ⁇ of about 20 °.
  • the nose 16 extends continuously from the area of rear end or the cylindrical portion of the drill head up to the area of its top.
  • the radial extension of the nose is approximately 1 up to 5% of the maximum diameter of the thread core, preferably about 10 to 20 mm.
  • the ratio of radial to axial extension of the nose is about 2: 1.
  • the nose 16 is at its radially outer end rounded.
  • the drill pipe 1 is a metallic hollow cylinder whose outer diameter is only slightly smaller than the inside diameter of the collar 5. One end of this drill pipe 1 is between the teeth 3 of the Provide drill head 2 matching teeth 8.
  • the earth auger is installed by inserting the with teeth provided end of the drill pipe 1 in the open, inside the collar 5 located end of the drill head 2, whereby, as especially from Fig. 2nd it can be seen between the bevel 7 of the collar 5 and the lower one End of the drill pipe 1, a strand 9 of a suitable, sealing Packing material is arranged during the further pushing in of the drill pipe 1 in the drill head 2 automatically between the latter End and the inner wall of the collar 5 is taken. It results an excellent seal between the Drill tube 1 and the drill head 2.
  • the teeth 8 of the tube 1 and the teeth 3 of the drill head 2 are in engagement with one another, can be on the bevel 7, of which the aforementioned strand 9 is now entirely has removed a second strand 10 of the same sealing packing material Arrange.
  • This second strand is used when using the earth auger by acting on the outside of the auger in the borehole Water pressure in the slot between the bevel 7 and the drill 1 pressed, which further improves the seal between the Drill pipe 1 and the drill head 2 results.
  • the drill pipe 1 filled with concrete. After the concrete has hardened, If necessary, pull the drill pipe out of the drill hole.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Geology (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Physics & Mathematics (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Structural Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Paleontology (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Earth Drilling (AREA)

Claims (9)

  1. Tête de forage (2) pour un foret destiné à réaliser des trous de forage par refoulement du terrain, comportant :
    un noyau fileté qui va en se rétrécissant en continu en forme hélicoïdale depuis un grand diamètre à son extrémité arrière jusqu'à une pointe à son extrémité avant, de sorte que la périphérie extérieure du noyau fileté forme, vue en section transversale, un contour en gradins avec des surfaces de gradin horizontales (12) et verticales (14),
    caractérisée en ce que :
    sur la périphérie extérieure du noyau fileté, il est prévu un bec périphérique (16) s'étendant en continu en forme hélicoïdale, dont la face inférieure (18) se raccorde, vue en direction transversale, en affleurement à une surface de gradin horizontale (14) et dont la face supérieure (20) est inclinée d'un angle aigu (β) par rapport à la face inférieure (18).
  2. Tête de forage selon la revendication 1, caractérisée en ce que le bec (16) s'étend en continu depuis la zone de l'extrémité arrière jusque dans la zone de la pointe de la tête de forage (2).
  3. Tête de forage selon la revendication 1, caractérisée en ce que l'extension radiale du bec (16) est d'environ 1 à 5 % du diamètre maximal du noyau fileté.
  4. Tête de forage selon la revendication 1, caractérisée en ce que l'extension radiale du bec (16) est d'environ 10 à 20 mm.
  5. Tête de forage selon la revendication 1, caractérisée en ce que le rapport entre l'extension radiale et l'extension axiale du bec (16) est d'environ 2 : 1.
  6. Tête de forage selon la revendication 1, caractérisée en ce que l'angle aigu (β) est d'environ 15° à 25°, en particulier d'environ 20°.
  7. Tête de forage selon la revendication 1, caractérisée en ce que le bec (16) est arrondi à son extrémité radialement extérieure.
  8. Tête de forage selon la revendication 1, caractérisée en ce que le noyau fileté présente un tronçon de tige cylindrique (5) dans la zone de l'extrémité arrière, et en ce qu'il est prévu une nervure périphérique hélicoïdale (4) dans la zone de ce tronçon de tige (5).
  9. Tête de forage selon la revendication 1, caractérisée en ce que celle-ci est pourvue d'une denture (3) du côté arrière.
EP02015007A 2001-07-26 2002-07-04 Tête de forage Expired - Lifetime EP1279793B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10136468 2001-07-26
DE10136468A DE10136468A1 (de) 2001-07-26 2001-07-26 Bohrkopf

Publications (2)

Publication Number Publication Date
EP1279793A1 EP1279793A1 (fr) 2003-01-29
EP1279793B1 true EP1279793B1 (fr) 2004-04-07

Family

ID=7693200

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02015007A Expired - Lifetime EP1279793B1 (fr) 2001-07-26 2002-07-04 Tête de forage

Country Status (2)

Country Link
EP (1) EP1279793B1 (fr)
DE (2) DE10136468A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3001250B1 (fr) * 2008-01-03 2016-05-13 Cie Du Sol Procede de forage comprenant une etape de desolidarisation de l'outil de coupe
PL2146046T3 (pl) 2008-07-15 2014-09-30 Marti Gruendungstechnik Ag Głowica wiertnicza dla urządzenia wiertniczego do wykonywania otworów w gruncie budowlanym o niedostatecznej nośności
EP4227467A1 (fr) 2022-02-09 2023-08-16 Marti Gründungstechnik AG Mèche de forage pour un dispositif de forage permettant de créer des trous de forage dans un terrain de fondation

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1193081B (de) * 1963-02-14 1965-05-20 Frank Arnold Nix Dipl Ing Vorrichtung zum Auffahren von im Querschnitt kreisfoermigen Stollen od. dgl.
FR2215075A6 (fr) * 1973-01-19 1974-08-19 Atlas France
DE2936060C2 (de) * 1979-09-06 1986-11-06 Fundex P.V.B.A., Zeebrugge Erdbohrer und Bohrkopf dafür
FR2516958B1 (fr) * 1981-09-22 1985-08-16 Dn Inzh Str Inst Dispositif pour confection par moulage de pieux creux et procede de confection de tels pieux en utilisant ce dispositif
US6033152A (en) * 1997-04-11 2000-03-07 Berkel & Company Contractors, Inc. Pile forming apparatus
FR2800796B1 (fr) * 1999-11-04 2002-02-01 Cie Du Sol Dispositif de forage du type a tariere

Also Published As

Publication number Publication date
EP1279793A1 (fr) 2003-01-29
DE10136468A1 (de) 2003-02-06
DE50200332D1 (de) 2004-05-13

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