EP1279793A1 - Tête de forage - Google Patents

Tête de forage Download PDF

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Publication number
EP1279793A1
EP1279793A1 EP02015007A EP02015007A EP1279793A1 EP 1279793 A1 EP1279793 A1 EP 1279793A1 EP 02015007 A EP02015007 A EP 02015007A EP 02015007 A EP02015007 A EP 02015007A EP 1279793 A1 EP1279793 A1 EP 1279793A1
Authority
EP
European Patent Office
Prior art keywords
nose
head according
drilling head
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.)
Granted
Application number
EP02015007A
Other languages
German (de)
English (en)
Other versions
EP1279793B1 (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 the production of earth boreholes with displacement of the soil with a threaded core which tapers continuously from a larger diameter at its rear end to a tip at its front end, so that the outer circumference of the thread core is seen in cross section forms a step-like contour with horizontal and vertical 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 designed as a hollow body and has a collar on the back, into which the drill pipe can be inserted with its front end.
  • the screw-shaped thread core continuously presses the ground surrounding the drill head, the displacement forces increasing with increasing diameter of the drill head. Power losses occur in the area of the vertical step surfaces of the thread core, since the soil, with increasing basic tension, switches to an area with lower basic tension. This phenomenon is also known as "slip".
  • the nose provided according to the invention generates an upward force when the drill head is screwed into the ground through the inclined surface of the nose, which substantially reduces the slip described at the beginning. This means that drilling can be done faster and higher drilling capacities are possible.
  • the nose extends continuously from the area of the rear end of the drill head to the area of the tip. This creates the upward force along the largest possible screw length of the drill head.
  • the radial extension of the nose is approximately 1 to 5% of the maximum diameter of the thread core. This ensures that the reduction of the slip is ensured, but that the nose due to a too large radial Expansion does not produce any other negative effects on the drilling process.
  • the radial extension of the nose can preferably be approximately 10 to 20 mm, in particular approximately 15 mm.
  • the ratio of radial to axial extension of the nose can be approximately 2: 1. Such training has shown positive results in test trials.
  • a helically surrounding rib can be provided in the region of the rear end of the drill head, but this rib does not overlap with the nose.
  • the drill head 2 is a metallic hollow cone body with a threaded core which extends from a larger diameter at its rear end to a tip at its front End continuously tapered helically so that seen in cross section, the outer circumference of the thread core forms a step-shaped contour with horizontal step faces 12 and vertical step faces 14.
  • the metallic hollow cone body also has a helical inside, so that it has the same wall thickness everywhere in relation to the height of the turns. The only exception is the cone base, which is open at the top and has a larger wall thickness.
  • the reinforced cone base is provided with teeth 3, the gaps between the teeth 3 being connected to the interior and the base opening of the hollow cone body.
  • an outwardly projecting rib 4 extending perpendicular to the drilling axis is provided on the outer circumference in the area of the hollow cylindrical section of the drilling head.
  • a collar 5 protrudes above the rib 4 and the teeth 3, which collar runs in parallel with the drill head axis and is arranged almost flush with respect to the outside of the penultimate turn 6 located next to the rib 4.
  • the upper edge of the collar 5 has an inner bevel 7.
  • the inner wall of the hollow cone body thus formed is provided with stiffening ribs.
  • the apex angle ⁇ of the drill head 2 designed in this way is approximately 50 to 60 °.
  • a continuously helical circumferential nose 16 is provided according to the invention, the underside 18 of which, seen in cross section, connects flush to the adjacent horizontal step surface 12.
  • the upper side 20 of the nose 16 forms an acute angle ⁇ of approximately 20 ° to the lower side 18.
  • the nose 16 extends continuously from the area of the rear end or the cylindrical section of the drill head to the area of its tip.
  • the radial extension of the nose is about 1 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 approximately 2: 1.
  • the nose 16 is rounded at its radially outer end.
  • the drill pipe 1 is a metallic hollow cylinder, the outer diameter of which is only slightly smaller than the inner diameter of the collar 5.
  • One end of this drill pipe 1 is provided with teeth 8 which fit between the teeth 3 of the drill head 2.
  • the assembly of the earth auger takes place by pushing the toothed end of the drill pipe 1 into the open end of the drill head 2 located within the collar 5, whereby, as can be seen above all from FIG. 2, between the bevel 7 of the collar 5 and a strand 9 of a suitable, sealing packing material is arranged at the lower end of the drill pipe 1 and is automatically carried between this end and the inner wall of the collar 5 as the drill pipe 1 is pushed further into the drill head 2. This results in an excellent seal between the Drill pipe 1 and the drill head 2.
  • the drill pipe 1 When the auger has been completely drilled into the ground, the drill pipe 1 is filled with concrete. After the concrete has hardened, the drill pipe can be pulled out of the borehole if necessary.

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)
  • Paleontology (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Earth Drilling (AREA)
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 true EP1279793A1 (fr) 2003-01-29
EP1279793B1 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)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2146046A1 (fr) 2008-07-15 2010-01-20 Marti Gründungstechnik AG Tête de forage pour un dispositif de forage destiné à la création de trous de forage dans un sol de fondation insuffisamment portant
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

Families Citing this family (1)

* 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

Citations (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
DE2936060A1 (de) * 1979-09-06 1981-04-02 Fundex P.V.B.A., St. Michiels, Brugge Erdbohrer und dabei angewendeter bohrkopf
DE3235118A1 (de) * 1981-09-22 1983-04-07 Dnepropetrovskij inženerno-stroitel'nyj institut, Dnepropetrovsk Einrichtung zur herstellung von ortmantelpfaehlen sowie verfahren zur herstellung solcher pfaehle unter verwendung dieser einrichtung
US6033152A (en) * 1997-04-11 2000-03-07 Berkel & Company Contractors, Inc. Pile forming apparatus
EP1098064A1 (fr) * 1999-11-04 2001-05-09 Compagnie Du Sol Dispositif de forage du type à tarière

Patent Citations (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
DE2936060A1 (de) * 1979-09-06 1981-04-02 Fundex P.V.B.A., St. Michiels, Brugge Erdbohrer und dabei angewendeter bohrkopf
DE3235118A1 (de) * 1981-09-22 1983-04-07 Dnepropetrovskij inženerno-stroitel'nyj institut, Dnepropetrovsk Einrichtung zur herstellung von ortmantelpfaehlen sowie verfahren zur herstellung solcher pfaehle unter verwendung dieser einrichtung
US6033152A (en) * 1997-04-11 2000-03-07 Berkel & Company Contractors, Inc. Pile forming apparatus
EP1098064A1 (fr) * 1999-11-04 2001-05-09 Compagnie Du Sol Dispositif de forage du type à tarière

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2146046A1 (fr) 2008-07-15 2010-01-20 Marti Gründungstechnik AG Tête de forage pour un dispositif de forage destiné à la création de trous de forage dans un sol de fondation insuffisamment portant
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

Also Published As

Publication number Publication date
DE50200332D1 (de) 2004-05-13
EP1279793B1 (fr) 2004-04-07
DE10136468A1 (de) 2003-02-06

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