EP0974729B1 - Spiralbohrer - Google Patents

Spiralbohrer Download PDF

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Publication number
EP0974729B1
EP0974729B1 EP99113991A EP99113991A EP0974729B1 EP 0974729 B1 EP0974729 B1 EP 0974729B1 EP 99113991 A EP99113991 A EP 99113991A EP 99113991 A EP99113991 A EP 99113991A EP 0974729 B1 EP0974729 B1 EP 0974729B1
Authority
EP
European Patent Office
Prior art keywords
screw
wall
radial
plate
oriented
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
EP99113991A
Other languages
English (en)
French (fr)
Other versions
EP0974729A1 (de
Inventor
Marco Pedrelli
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.)
Soilmec SpA
Original Assignee
Soilmec SpA
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Filing date
Publication date
Application filed by Soilmec SpA filed Critical Soilmec SpA
Publication of EP0974729A1 publication Critical patent/EP0974729A1/de
Application granted granted Critical
Publication of EP0974729B1 publication Critical patent/EP0974729B1/de
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
    • E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
    • E21B21/10—Valve arrangements in drilling-fluid circulation systems
    • 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
    • E21B10/00—Drill bits
    • E21B10/44—Bits with helical conveying portion, e.g. screw type bits; Augers with leading portion or with detachable parts
    • 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
    • E21B34/00—Valve arrangements for boreholes or wells
    • E21B34/06—Valve arrangements for boreholes or wells in wells
    • E21B34/12—Valve arrangements for boreholes or wells in wells operated by movement of casings or tubings

Definitions

  • the present invention relates to a screw drilling device particularly for producing concrete foundation piles, of the type comprising a spiral screw integral with a central tubular element in which a duct is formed for the supply of a fluid to be injected into the borehole formed by the device.
  • Screw boring devices of the aforementioned type in which the lower end of the duct is closed by a plug, are known (see for instance EP-A-0 378 348).
  • the plug prevents earth from blocking the concrete-supply duct.
  • concrete is pumped through the duct; the concrete under pressure expels the plug and fills the cavity of the hole bored whilst the screw full of debris is extracted therefrom.
  • Extraction is effected with the screw kept stationary, that is, not rotating, or rotating slowly clockwise; anticlockwise rotation would cause the debris to fall from the screw, contaminating the concrete and compromising the quality of the product.
  • the plug which is connected to the screw by a chain, is usually replaced manually. This operation requires the presence of an operator at the bottom of the screw in a position which is dangerous because debris may fall from the screw.
  • a device which, at the beginning of the pumping stage, provides for a second, coaxial tubular element, extending throughout the length of the screw and connected to suitable lifting and lowering members, to extend telescopically from the lower end of the central tubular element.
  • the lower end of the second tubular element admits the fluid into the mass of fluid previously injected, beneath any debris and contaminants which, since they have a lower specific weight than concrete, tend to float and can therefore be removed upon completion of the pour.
  • the object of the present invention is to provide an improved screw drilling device which can prevent the problems mentioned above.
  • a further object of the present invention is to provide a device which can produce a borehole with a diameter larger than that of a conventional tube used to line the first metres of the hole.
  • a screw boring device according to the present invention is generally indicated 1.
  • the device 1 comprises a spiral screw 2 welded around a tubular core 3 in which a central duct 4 is formed for the supply of concrete or other mixtures to be injected into the borehole 5 formed by the device 1.
  • the boring device 1 is rotated and translated vertically about and along the central axis x in known manner and is preferably guided in the first metres of the drilling by a coaxial cylindrical outer tube 6 having the main function of lining the upper or initial portion of the borehole 5.
  • the lower end of the screw which terminates in a sharp radial cutting edge 2a, is firmly attached to a horizontal plate 7 in the form of a disk sector extending through an angle greater than 180°, that is, in the embodiment shown, an angle of about 240°.
  • the plate 7 which is referred to herein as the fixed plate, defines a circular-sector-shaped opening 8 extending through the complement to 360° of the above- mentioned angle, that is, through about 120° in the embodiment shown.
  • the tubular core 3 extends below the level of the plate 7 forming a lower end portion 3a of predetermined length "L", preferably of between 50 and 100 cm and generally comparable to the diameter of the screw.
  • the lower portion 3a has a cylindrical outer surface 3b which is preferably offset from the central axis x by an eccentricity "e".
  • the central duct 4 bends outwardly forming an inclined end duct portion 4a which opens in the outer cylindrical wall 3b with a lateral opening 4b.
  • a rotatable unit preferably formed as a single body, generally indicated 9, is fitted on the lower tube portion 3a and forms a plate-like portion 10 in the shape of a disk sector the shape and size of which correspond to those of the fixed plate 7, and a cylindrical bush-like portion 11.
  • the plate 10 which is referred to herein as the rotatable plate, defines a circular-sector-shaped axial opening 12 complementing the plate to 360°, and having a geometrical shape corresponding to that of the opening 8 in the fixed plate 7.
  • the lower surface of the rotatable plate 10 bears a plurality of members 13 for breaking up the ground.
  • the rotatable plate 10 On one of the radial sides which define the opening 12, the rotatable plate 10 forms an abutment 14 which projects axially in order to come into abutment alternatively with one of the two sides 8a, 8b of the opening 8 in the fixed plate 7, as will be explained further below.
  • the bush-like portion 11 has an eccentric inner cylindrical surface 15 and an eccentric outer cylindrical surface 16; the internal surface 15 which houses the lower tube portion 3a has the same eccentricity "e" as that tube portion and the outer surface 16 has a diameter corresponding to that of a conical tip 17 situated at the lower end of the device and fixed to the bottom of the tube 3a at 18 so as to clamp the rotatable body 9 axially relative to the tube 3a and hence to the screw.
  • the conical tip 17 bears a further set of breaking-up members 20.
  • the bush-like portion 11 has a lateral or radial hole 19 situated at the same level as the opening 4b in the tube portion 3a and preferably inclined in the same manner as the final portion of the duct 4a in order to be joined thereto in one of the two working conditions of the device, as shown in Figures 2 and 4.
  • the relative orientations of the radial hole 19 and of the axial opening 12 are such that, in the first working condition which the device adopts during the boring stage ( Figures 1 and 3), the angular openings 8 and 12 of the respective plate-like portions 7 and 10 are aligned axially and the opening 4b of the duct 4, 4a is blocked by the bush-like portion 11 whereas, in the second working condition, which is adopted at the stage of the injection of concrete and simultaneous extraction of the device from the borehole ( Figures 2 and 4), the angular opening 8 is closed by the rotatable plate 10 and the radial hole 19 meets the opening 4b.
  • the device of the present invention operates as follows.
  • the screw device performs a combined clockwise rotational and vertical downward translational movement, as indicated by the arrow A.
  • the side 8a of the "fixed" plate 7 abuts the abutment 14 of the rotatable body 9 causing the body 9 to rotate ( Figure 3).
  • the angular openings 8 and 12 coincide and allow ground debris broken up by the members 13 to enter and rise between the turns of the screw 2.
  • the rotatable body 9 is oriented in a manner such that the cylindrical outer surface 16 of the bush-like portion 11 coincides with the circular profile of the base of the conical tip 17.
  • the duct 4, 4a is closed by the bush-like portion 11.
  • the hole 19 is located in the vicinity of the lower end of the bush-like portion 11 at an axial distance L' slightly shorter than the above-mentioned length L. This facilitates the injection of the fluid beneath the free surface 21 of the cast fluid; any floating waste is therefore not covered and trapped in the cast fluid but will rise and remain on the surface and can be removed, thus improving the quality of the concrete constituting the product.
  • the eccentric configuration of the rotatable body 9 relative to the axis of the screw is particularly advantageous since it enables a borehole of a diameter considerably larger than that of the screw and of the outer covering tube 6 to be produced.
  • the plate-like portion 10 also carries breaking-up members 13 on its peripheral portion which, in the boring condition, extends radially beyond the screw and the tube 6. This enables the borehole produced to have a diameter larger than that of the lining tube which can easily be fitted in the hole without having to be rotated; simpler machinery can therefore be used for moving the tube.
  • the plate-like portion 10 is included within the shape of the fixed plate 7 so that the entire device can be extracted from the tube to permit subsequent operations such as the positioning of reinforcement for strengthening the concrete.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Geology (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Fluid Mechanics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Paleontology (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Earth Drilling (AREA)
  • Drilling And Boring (AREA)
  • Drilling Tools (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)

Claims (9)

  1. Schneckenbohrvorrichtung, besonders zur Herstellung von Betonfundamentpfeilern, wobei die Vorrichtung eine Schneckenspindel (2) enthält, die mit einem zentralen Rohrelement (3) gemeinsam aufgebaut ist, in dem ein Kanal (4) ausgebildet ist, um ein Fluid einzuleiten, das in das Bohrloch (5) gespritzt werden soll, das die Vorrichtung ausbildet, dadurch gekennzeichnet, dass die Vorrichtung eine Einheit (9) enthält, die eine erste Wand (10) bildet, die eine erste axiale Öffnung (12) besitzt, sowie eine zweite Wand (11) bildet, die eine erste radiale Öffnung (19) besitzt, wobei die Einheit (9) drehbar an einem unteren Teil (3a) des Rohrelements (3) befestigt ist und zwei alternative Arbeitstellungen einnehmen kann:
    eine erste Stellung in einem Bohrzustand, in der die erste Wand (10) so ausgerichtet ist, dass Bohrklein durch die erste axiale Öffnung (12) zwischen die Windungen der Schnecke gelangen kann, und in der die zweite Wand (11) so ausgerichtet ist, dass sie eine zweite radiale Öffnung (4b) verschließt, die im unteren Rohrteil (3a) ausgebildet ist, um das Fluid vom Kanal (4) abzugeben, sowie
    eine zweite Stellung in einem Zustand, in dem das Fluid eingespritzt wird, in der die erste Wand (10) so ausgerichtet ist, dass sie die Schnecke am Boden verschließt, und in der die zweite Wand (11) so ausgerichtet ist, dass die erste und die zweite radiale Öffnung (19, 4b) miteinander in Verbindung stehen.
  2. Vorrichtung gemäß Anspruch 1, dadurch gekennzeichnet, dass die drehbare Einheit (9) enthält:
    eine radiale Platte (10), die die erste Wand bildet und parallel zu einer radialen Platte (7) und gegenüber von deren Unterseite liegt, die an der Schnecke befestigt ist, wobei die Platte (10) an ihrer Unterseite Aufbrechelemente (13) trägt, und wobei die Platten (10, 7) entsprechende a-xiale Öffnungen (8, 12) bilden, die in der ersten Stellung überlagert werden können, sowie
    einen zylindrischen, buchsenartigen Teil (11), der die zweite Wand bildet, in der die zweite radiale Öffnung (4b) ausgebildet ist.
  3. Vorrichtung gemäß Anspruch 2, dadurch gekennzeichnet, dass die Platten (7, 10) als sektorförmige Scheiben ausgebildet sind, die über Winkel von mehr als 180° verlaufen, und die axialen Öffnungen (8, 12) kreissektorförmige Öffnungen sind, die in den entsprechenden Platten ausgebildet sind.
  4. Vorrichtung gemäß Anspruch 3, dadurch gekennzeichnet, dass die Platten (7, 10) als scheibenförmige Sektoren ausgebildet sind, die über Winkel von etwa 240° verlaufen.
  5. Vorrichtung gemäß Anspruch 2, dadurch gekennzeichnet, dass die drehbare Einheit (9) eine Aufnahmeeinrichtung (14) bildet, um alternativ in der ersten und zweiten Stellung entsprechend gegenüberliegende Endflächen (8a, 8b) aufzunehmen, die für eine Drehung mit der Schnecke befestigt sind.
  6. Vorrichtung gemäß irgendeinem der bisherigen Ansprüche, dadurch gekennzeichnet, dass der untere Rohrteil (3a) relativ zur Achse (x) der Schnecke exzentrisch liegt, und dass die drehbare Einheit (9) weiters auf dem Randteil ihres plattenartigen Teils (10) Aufbrechelemente (13) trägt, so dass in der ersten Betriebsstellung zumindest eines dieser Elemente radial zumindest um einen Abstand von der Mittelachse verläuft, der im Wesentlichen dem Radius eines Rohres (6) entspricht, um das Bohrloch (5) auszukleiden.
  7. Vorrichtung gemäß Anspruch 6, dadurch gekennzeichnet, dass der buchsenartige Teil (11) eine exzentrische, zylindrische Fläche (15) besitzt, in die der untere Rohrteil (3a) eingesetzt werden kann.
  8. Vorrichtung gemäß Anspruch 6, dadurch gekennzeichnet, dass der buchsenartige Teil (11) eine zylindrische Außenfläche (16) besitzt, die einen Durchmesser besitzt, der dem Durchmesser einer konischen Spitze (17) entspricht, die am unteren Ende des Rohrteils (3a) befestigt (18) ist, um die drehbare Einheit (9) an der Schnecke axial einzuspannen.
  9. Vorrichtung gemäß Anspruch 1, dadurch gekennzeichnet, dass die radialen Öffnungen (4b, 19) in einem axialen Abstand (L') ausgebildet sind, der nicht weniger als etwa 50 cm von der radialen Platte (10) beträgt.
EP99113991A 1998-07-21 1999-07-19 Spiralbohrer Expired - Lifetime EP0974729B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT1998TO000638A IT1303164B1 (it) 1998-07-21 1998-07-21 Dispositivo di perforazione ad elica.
ITTO980638 1998-07-21

Publications (2)

Publication Number Publication Date
EP0974729A1 EP0974729A1 (de) 2000-01-26
EP0974729B1 true EP0974729B1 (de) 2003-10-08

Family

ID=11416946

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99113991A Expired - Lifetime EP0974729B1 (de) 1998-07-21 1999-07-19 Spiralbohrer

Country Status (5)

Country Link
EP (1) EP0974729B1 (de)
AT (1) ATE251710T1 (de)
DE (1) DE69911865T2 (de)
ES (1) ES2209292T3 (de)
IT (1) IT1303164B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10359103A1 (de) * 2003-12-17 2005-07-21 Bauer Spezialtiefbau Gmbh Drehboden für Doppelkopfbohren

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2832438B1 (fr) * 2001-11-20 2004-10-22 Durmeyer Entrp Travaux Publics Tariere pour la realisation de trous fores et/ou betonnes et procedes mettant en oeuvre ladite tariere
EP1580323B1 (de) * 2004-03-26 2006-05-31 BAUER Maschinen GmbH Bohrschnecke und Verfahren zum Erstellen einer Gründungssäule im Boden
ITTO20120405A1 (it) * 2012-05-07 2013-11-08 Soilmec Spa Punta di scavo per un'elica di un assieme di scavo di terreno, in particolare per la realizzazione di pali escavati, e procedimento di perforazione che utilizza tale punta.
CN107387003B (zh) * 2017-09-11 2023-09-19 长江大学 一种防止井眼岩屑卡钻的脉冲射流阀
CN112903958B (zh) * 2021-01-18 2022-11-18 深圳市工勘岩土集团有限公司 测定土层的天然密度及松散系数的方法

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8716926U1 (de) * 1987-12-23 1988-02-11 Bauer Spezialtiefbau GmbH, 8898 Schrobenhausen Bohrschnecke
FR2635129A1 (fr) * 1988-08-03 1990-02-09 Cofor Cie Forage Perfectionnements aux dispositifs et procedes pour la realisation de pieux en beton dans le sol
AU634150B2 (en) * 1988-08-29 1993-02-18 Catawa Pty Ltd Drills for piles and soil stabilization
US5013191A (en) * 1989-01-09 1991-05-07 Katsumi Kitanaka Cast-in-place piling method and apparatus
DE3900453A1 (de) * 1989-01-10 1990-07-12 Vortriebs Und Abfoerdertechnik Bohrkopf einer horizontal-vortriebsmaschine
DE19515001A1 (de) * 1995-04-24 1996-12-05 Abf Technik Axel Friedhoff Bohrkopf einer Hohlbohrschnecke

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10359103A1 (de) * 2003-12-17 2005-07-21 Bauer Spezialtiefbau Gmbh Drehboden für Doppelkopfbohren
DE10359103B4 (de) * 2003-12-17 2006-04-27 Bauer Spezialtiefbau Gmbh Vorrichtung zur Herstellung von Bohrpfählen

Also Published As

Publication number Publication date
DE69911865T2 (de) 2004-05-13
IT1303164B1 (it) 2000-10-30
ATE251710T1 (de) 2003-10-15
DE69911865D1 (de) 2003-11-13
EP0974729A1 (de) 2000-01-26
ITTO980638A1 (it) 2000-01-21
ES2209292T3 (es) 2004-06-16

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