EP1359258B1 - Pile foot reamer - Google Patents

Pile foot reamer Download PDF

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Publication number
EP1359258B1
EP1359258B1 EP03006237A EP03006237A EP1359258B1 EP 1359258 B1 EP1359258 B1 EP 1359258B1 EP 03006237 A EP03006237 A EP 03006237A EP 03006237 A EP03006237 A EP 03006237A EP 1359258 B1 EP1359258 B1 EP 1359258B1
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EP
European Patent Office
Prior art keywords
pile
cutting
cutting device
cutting blades
pile foot
Prior art date
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Expired - Fee Related
Application number
EP03006237A
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German (de)
French (fr)
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EP1359258A1 (en
Inventor
Werner Dipl.-Ing. Harthauser (Fh)
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Bauer Maschinen GmbH
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Bauer Maschinen GmbH
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Publication of EP1359258A1 publication Critical patent/EP1359258A1/en
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    • 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
    • E02D5/38—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds
    • E02D5/44—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds with enlarged footing or enlargements at the bottom of the pile
    • 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
    • E21B10/26—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers
    • E21B10/32—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers with expansible cutting tools
    • E21B10/322—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers with expansible cutting tools cutter shifted by fluid pressure
    • 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
    • E21B10/26—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers
    • E21B10/32—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers with expansible cutting tools
    • E21B10/327—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers with expansible cutting tools the cutter being pivoted about a longitudinal axis

Definitions

  • the invention relates to a pile foot cutting device for the substantially radial expansion of a foot region of a pile borehole.
  • the invention generally lies in the field of foundation piles to be introduced into the soil, which are created by placing a pile borehole in the soil and subsequently filling it with concrete or another hardening suspension.
  • Pile-foot cutting devices serve to expand the cylindrical pile bore in the foot or sole area. This expansion of the pile base bore an enlarged footprint of the foundation pile is achieved so that it is able to bear a higher load in the upcoming subsoil as in the case of a cylindrical pile.
  • the allowable concrete stress within the pile shaft can be optimally utilized, the bearing capacity of the pile with extended foot area is far below the allowable concrete stress of the cylindrical pile shaft.
  • JP-A-04 228 797 describes a method for pile root expansion with a device having a cylindrical base body and a cone-shaped foot. On the side wall of the body blades are attached, carried out by the rotation of the body extension of the pile base.
  • the invention has for its object to provide a pile foot cutting device, which allows for a simple and compact construction reliable production of a pile base.
  • the pile-foot cutting device comprises a cylindrical base body as well as cylindrical shell segments of the cylindrical base body formed cutting wings, which are pivotally on the base body, laterally out of this with specifiable angle of attack can be folded.
  • the cutting wings are according to the invention cylindrical shell segments, which are articulated along a surface line on the main body. On the opposite longitudinal side of the respective cutting blade cutting devices are arranged, which remove soil material in the unfolded position and thereby form the Pfahlfußerweittation. In the folded-in position, the cylinder shell segment-shaped cutting blades are flush with the adjacent cylindrical base body, so that the entire device can be introduced into a cylindrical bore.
  • a receiving space for processed soil material is provided in the base body below the fold-out cutting wings.
  • the resulting in producing the pile extension soil material can be absorbed and transported away from the well. This prevents that worn soil material remains at the bottom of the hole, which could lead to subsidence.
  • a particularly useful development is achieved according to the invention in that the receiving space on his Bottom closed with a lid, which is pivotally hinged to the cylindrical body and locked.
  • the lid is locked in its closed position, so that the processed soil material can be conveyed in the receiving space with out of the wellbore. Outside the borehole, the lid can be unlocked and pivoted to an open position, so that the receiving space is emptied of the processed soil material.
  • a further preferred embodiment according to the invention is that in the unfolded position of the cutting blade of the cylindrical base body is opened laterally, so that processed by the cutting blades soil material is conveyed into the receiving space.
  • a core tube for pressure compensation runs inside the main body, with the core tube opening into an outlet opening in the cover. This can be done a pressure equalization while pulling the drill.
  • a further embodiment of the invention consists in that in the base body an actuating device is provided, through which the cutting blades between a folded position and a deployed position are pivotable.
  • the actuator can also be operated so that, depending on the desired Pfahlfußerweit réelle the scope of Ausklappiolo the cutting blade is variable.
  • the actuating device comprises at least one hydraulic cylinder.
  • a total of two hydraulic cylinders are provided, so that within the body a largely symmetrical load and a force compensation can result.
  • the actuating device comprises a lever mechanism.
  • This can in particular have a toggle mechanism, which allows a particularly stable positioning of the cutting blades.
  • a connecting device for a drill string, a pressure equalization line and / or a hydraulic line is arranged on the upper side of the main body.
  • the cutting device according to the invention can be attached, for example, to a conventional Kelly bar.
  • the energy supply can take place via conventional connections.
  • a pile foot cutting device 10 comprises a cylindrical basic body 12, at the middle region of which two opposite cutting blades 14 are arranged.
  • the cutting wings 14 are formed in the form of a cylinder jacket segment.
  • its outer surface is a cylinder jacket segment 17, which is designed so that it can be pivoted flush into a corresponding recess on the cylindrical base body 12.
  • the cutting blades 14 are articulated on one longitudinal side of the cylindrical base body 12 pivotally, while on the opposite free longitudinal side of a cutting device with a plurality of cutting teeth 26 is formed.
  • a plurality of arcuate stiffening struts 15 are arranged on the inside thereof.
  • FIG. 1 the invention Pfahlfuß cutting device 10 is shown with folded blades 14.
  • the cutting teeth 26 work the adjacent soil material as the device rotates, thereby providing a cavity for a pile root extension.
  • the processed cutting material is displaced in the direction of the cylindrical base body 12 and can pass through the recess for the folded-out cutting blades 14 into a receiving space 16, which below the cutting blades 14 in the cylindrical base body 12th is trained.
  • the receiving space 16 is closed on its underside by a lid 18.
  • the lid 18 is pivotally hinged on the one hand on the cylindrical base body 12 and on the other hand has a lock 24 which can be locked and unlocked via a latch actuator 25.
  • the lid 18 When creating the Pfahlfußer shimmertation the lid 18 is closed, so that the processed soil material remains within the receiving space 16. After deploying the pile foot cutter 10 from the wellbore, the filled receiving space 16 can be emptied by unlocking the lid 18, which swings open by the weight of the soil material. The closing of the cover 18 can be done by a force device, by hand or simply by placing the pile foot cutting device 10 on the ground.
  • the connecting device 40 is essentially a pipe socket, which is additionally stiffened with reinforcing plates 42.
  • the connecting device also serves for the torsionally rigid attachment of the pile foot cutting device 10 to a, not shown, rotationally driven drill string.
  • a total of two pairs of hydraulic cylinders 32 are arranged radially opposite one another.
  • the individual hydraulic cylinders 32 are articulated on the one hand on the inside of the cylindrical base body 12 and on the other hand on a pivot lever 35 of a lever mechanism 34.
  • the lever mechanism 34 and the hydraulic cylinders 32 form the actuating device 30 for folding in and out of the two cutting wings 14.
  • the hydraulic cylinders 32 are retracted.
  • the pivot lever 35 is pivoted.
  • the pivot lever 35 which is composed of a total of three plates is fixedly connected to a tubular bushing 36 which is pivotally mounted about the core tube 20.
  • two toggle mechanisms 37 for a cutting blade 14 are provided in the lower region of the bush 36.
  • the toggle mechanism 37 is in each case on the one hand firmly connected to the bushing 36 and on the other hand articulated on the inside of the pivoting wing 14.

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

Description

Die Erfindung betrifft eine Pfahlfuß-Schneidvorrichtung zur im Wesentlichen radialen Erweiterung eines Fußbereiches einer Pfahlbohrung.The invention relates to a pile foot cutting device for the substantially radial expansion of a foot region of a pile borehole.

Die Erfindung liegt im Allgemeinen auf dem Gebiet von in das Erdreich einzubringenden Gründungspfählen, die dadurch erstellt werden, dass in das Erdreich eine Pfahlbohrung eingebracht und diese hinterher mit Beton oder einer anderen aushärtenden Suspension aufgefüllt wird. Pfahlfuß-Schneidvorrichtungen dienen dabei zur Erweiterung der zylindrischen Pfahlbohrung im Fuß- oder Sohlenbereich. Durch diese Erweiterung der Pfahlfuß-Bohrung wird eine vergrößerte Aufstandsfläche des Gründungspfahles erreicht, so dass dieser eine höhere Last in dem anstehenden Baugrund zu tragen vermag als im Falle eines zylindrischen Pfahls. Durch die Pfahlfußerweiterung kann die zulässige Betonspannung innerhalb des Pfahlschachtes optimal ausgenutzt werden, wobei die Tragfähigkeit des Pfahles mit erweitertem Fußbereich weit unter der zulässigen Betonspannung des zylindrischen Pfahlschachtes liegt.The invention generally lies in the field of foundation piles to be introduced into the soil, which are created by placing a pile borehole in the soil and subsequently filling it with concrete or another hardening suspension. Pile-foot cutting devices serve to expand the cylindrical pile bore in the foot or sole area. This expansion of the pile base bore an enlarged footprint of the foundation pile is achieved so that it is able to bear a higher load in the upcoming subsoil as in the case of a cylindrical pile. Through the Pfahlfußerweiterung the allowable concrete stress within the pile shaft can be optimally utilized, the bearing capacity of the pile with extended foot area is far below the allowable concrete stress of the cylindrical pile shaft.

Die JP-A-04 228 797 beschreibt ein Verfahren zur Pfahlfußerweiterung mit einer Vorrichtung, die einen zylinderförmigen Grundkörper und einen konusförmigen Fuß aufweist. An der Seitenwand des Grundkörpers sind Schaufeln angebracht, durch die bei Rotation des Grundkörpers die Erweiterung des Pfahlfußes erfolgt.JP-A-04 228 797 describes a method for pile root expansion with a device having a cylindrical base body and a cone-shaped foot. On the side wall of the body blades are attached, carried out by the rotation of the body extension of the pile base.

Weitere Bohrvorrichtungen mit ausklappbaren Flügeln sind aus der gattungsgemäßen JP-A-10 184 257 oder der JP-A-09 004 353 bekannt.Further drilling devices with fold-out wings are known from the generic JP-A-10 184 257 or JP-A-09 004 353.

Der Erfindung liegt die Aufgabe zugrunde, eine Pfahlfuß-Schneidvorrichtung zu schaffen, welche bei einem einfachen und kompakten Aufbau eine zuverlässige Herstellung eines Pfahlfußes ermöglicht.The invention has for its object to provide a pile foot cutting device, which allows for a simple and compact construction reliable production of a pile base.

Die Aufgabe wird durch eine Pfahlfuß-Schneidvorrichtung mit den Merkmalen des Anspruchs 1 gelöst. Bevorzugte Ausführungsformen der Erfindung sind in den abhängigen Ansprüchen angegeben.The object is achieved by a pile foot cutting device having the features of claim 1. Preferred embodiments of the invention are indicated in the dependent claims.

Die erfindungsgemäße Pfahlfuß-Schneidvorrichtung umfasst einen zylindrischen Grundkörper sowie als Zylinderschalensegmente des zylindrischen Grundkörpers ausgebildete Schneidflügel, die schwenkbar am Grundkörper, seitlich aus diesem mit vorgebbarem Anstellwinkel ausklappbar sind.The pile-foot cutting device according to the invention comprises a cylindrical base body as well as cylindrical shell segments of the cylindrical base body formed cutting wings, which are pivotally on the base body, laterally out of this with specifiable angle of attack can be folded.

Die Schneidflügel sind nach der Erfindung Zylinderschalensegmente, welche entlang einer Mantellinie an dem Grundkörper angelenkt sind. An der gegenüberliegenden Längsseite des jeweiligen Schneidflügels sind Schneideinrichtungen angeordnet, welche in der ausgeklappten Position Bodenmaterial abtragen und dabei die Pfahlfußerweiterung bilden. In der eingeklappten Position schließen die zylinderschalensegmentförmigen Schneidflügel bündig mit dem angrenzenden zylindrischen Grundkörper ab, so dass die gesamte Vorrichtung in eine zylindrische Bohrung eingebracht werden kann.The cutting wings are according to the invention cylindrical shell segments, which are articulated along a surface line on the main body. On the opposite longitudinal side of the respective cutting blade cutting devices are arranged, which remove soil material in the unfolded position and thereby form the Pfahlfußerweiterung. In the folded-in position, the cylinder shell segment-shaped cutting blades are flush with the adjacent cylindrical base body, so that the entire device can be introduced into a cylindrical bore.

Gemäß der Erfindung ist es vorgesehen, dass in dem Grundkörper unterhalb der ausklappbaren Schneidflügel ein Aufnahmeraum für abgearbeitetes Bodenmaterial vorgesehen ist. Auf diese Weise kann das beim Herstellen der Pfahlerweiterung anfallende Bodenmaterial aufgenommen und aus dem Bohrloch abtransportiert werden. Hierdurch wird verhindert, dass abgearbeitetes Bodenmaterial am Bohrungsgrund verbleibt, was zu Setzungen führen könnte.According to the invention, it is provided that a receiving space for processed soil material is provided in the base body below the fold-out cutting wings. In this way, the resulting in producing the pile extension soil material can be absorbed and transported away from the well. This prevents that worn soil material remains at the bottom of the hole, which could lead to subsidence.

Eine besonders zweckmäßige Weiterbildung wird nach der Erfindung dadurch erreicht, dass der Aufnahmeraum an seiner Unterseite mit einem Deckel verschließbar ist, welcher an dem zylindrischen Grundkörper schwenkbar angelenkt und verriegelbar ist. Während der Erstellung der Pfahlerweiterung ist der Deckel in seiner geschlossenen Position verriegelt, so dass das abgearbeitete Bodenmaterial in dem Aufnahmeraum mit aus dem Bohrloch gefördert werden kann. Außerhalb des Bohrloches kann der Deckel entriegelt und in eine geöffnete Position geschwenkt werden, so dass der Aufnahmeraum von dem abgearbeiteten Bodenmaterial entleert wird.A particularly useful development is achieved according to the invention in that the receiving space on his Bottom closed with a lid, which is pivotally hinged to the cylindrical body and locked. During the preparation of the pile extension, the lid is locked in its closed position, so that the processed soil material can be conveyed in the receiving space with out of the wellbore. Outside the borehole, the lid can be unlocked and pivoted to an open position, so that the receiving space is emptied of the processed soil material.

Eine weitere bevorzugte Ausführungsform besteht nach der Erfindung darin, dass in der ausgeklappten Position der Schneidflügel der zylindrische Grundkörper seitlich geöffnet ist, so dass von den Schneidflügeln abgearbeitetes Bodenmaterial in den Aufnahmeraum gefördert wird. Dies erlaubt eine besonders kompakte Ausführung der Pfahlfuß-Schneidvorrichtung, wobei gleichzeitig ein zuverlässiges Abfördern des Bodenmaterials der Pfahlfußerweiterung gewährleistet ist.A further preferred embodiment according to the invention is that in the unfolded position of the cutting blade of the cylindrical base body is opened laterally, so that processed by the cutting blades soil material is conveyed into the receiving space. This allows a particularly compact design of the pile foot cutting device, at the same time a reliable discharge of the soil material of the pile base extension is ensured.

Erfindungsgemäß verläuft innerhalb des Grundkörpers ein Seelenrohr zum Druckausgleich, wobei das Seelenrohr in einer Austrittsöffnung im Deckel mündet. Hierdurch kann ein Druckausgleich beim Ziehen des Bohrwerkzeugs erfolgen.According to the invention, a core tube for pressure compensation runs inside the main body, with the core tube opening into an outlet opening in the cover. This can be done a pressure equalization while pulling the drill.

Eine weitere Ausführungsform der Erfindung besteht darin, dass in dem Grundkörper eine Betätigungseinrichtung vorgesehen ist, durch welchen die Schneidflügel zwischen einer eingeklappten Position und einer ausgeklappten Position verschwenkbar sind. Die Betätigungseinrichtung kann dabei auch so betrieben werden, dass je nach der gewünschten Pfahlfußerweiterung der Umfang der Ausklappbewegung der Schneidflügel variierbar ist.A further embodiment of the invention consists in that in the base body an actuating device is provided, through which the cutting blades between a folded position and a deployed position are pivotable. The actuator can also be operated so that, depending on the desired Pfahlfußerweiterung the scope of Ausklappbewegung the cutting blade is variable.

Ein schnelles und zuverlässiges Ausklappen der Schneidflügel selbst in festeren Böden wird erfindungsgemäß dadurch erreicht, dass die Betätigungseinrichtung mindestens einen Hydraulikzylinder umfasst. Bei der bevorzugten Anordnung von zwei Schneidflügeln sind insgesamt zwei Hydraulikzylinder vorgesehen, so dass sich innerhalb des Grundkörpers eine weitgehend symmetrische Belastung und eine Kraftkompensation ergeben kann.A quick and reliable unfolding of the cutting blades even in firmer soils is inventively achieved in that the actuating device comprises at least one hydraulic cylinder. In the preferred arrangement of two cutting blades a total of two hydraulic cylinders are provided, so that within the body a largely symmetrical load and a force compensation can result.

Zur Verbesserung der Klappbewegung ist es erfindungsgemäß, dass die Betätigungseinrichtung einen Hebelmechanismus umfasst. Diese kann insbesondere einen Kniehebelmechanismus aufweisen, der eine besonders stabile Positionierung der Schneidflügel erlaubt.To improve the folding movement, it is according to the invention that the actuating device comprises a lever mechanism. This can in particular have a toggle mechanism, which allows a particularly stable positioning of the cutting blades.

Nach der Erfindung ist es weiter bevorzugt, dass an der Oberseite des Grundkörpers eine Verbindungseinrichtung für einen Bohrstrang, eine Druckausgleichsleitung und/oder eine Hydraulikleitung angeordnet ist. Über die Verbindungseinrichtung kann die erfindungsgemäße Schneidvorrichtung beispielsweise an einer herkömmlichen Kellystange befestigt werden. Die Energiezuführung kann über herkömmliche Anschlüsse erfolgen.According to the invention, it is further preferred that a connecting device for a drill string, a pressure equalization line and / or a hydraulic line is arranged on the upper side of the main body. About the connecting device, the cutting device according to the invention can be attached, for example, to a conventional Kelly bar. The energy supply can take place via conventional connections.

Die Erfindung wird weiter anhand von bevorzugten Ausführungsbeispielen erläutert, welche nachfolgend im Zusammenhang mit den beigefügten Zeichnungen erläutert sind. In den Zeichnungen zeigen:

Fig. 1
eine perspektivische Ansicht einer erfindungsgemäßen Pfahlfuß-Schneidvorrichtung;
Fig. 2
eine Schnittansicht der Pfahlfuß-Schneidvorrichtung gemäß Fig. 1 entlang dem Schnitt A-A; und
Fig. 3
eine Querschnittsansicht der erfindungsgemäßen Pfahlfuß-Schneidvorrichtung bei ausgeklappten Schneidflügeln.
The invention will be further elucidated on the basis of preferred exemplary embodiments, which are explained below in connection with the attached drawings. In the drawings show:
Fig. 1
a perspective view of a pile foot cutting device according to the invention;
Fig. 2
a sectional view of the pile foot cutting device of Figure 1 along the section AA. and
Fig. 3
a cross-sectional view of the invention according to the invention Pfahlfuß cutting device with unfolded cutting wings.

Eine erfindungsgemäße Pfahlfuß-Schneidvorrichtung 10 umfasst gemäß Fig. 1 einen zylindrischen Grundkörper 12, an dessen mittleren Bereich zwei gegenüberliegende Schneidflügel 14 angeordnet sind. Die Schneidflügel 14 sind zylindermantelsegmentförmig ausgebildet. Dabei ist ihre Außenfläche ein Zylindermantelsegment 17, welches so ausgebildet ist, dass dieses bündig in eine entsprechende Ausnehmung an dem zylindrischen Grundkörper 12 eingeschwenkt werden kann. Hierzu sind die Schneidflügel 14 an ihrer einen Längsseite an dem zylindrischen Grundkörper 12 schwenkbar angelenkt, während an der gegenüberliegenden freien Längsseite eine Schneideinrichtung mit einer Vielzahl von Schneidzähnen 26 ausgebildet ist. Zur Festigkeitserhöhung der Schneidflügel 14 sind an deren Innenseite mehrere bogenförmige Versteifungsstreben 15 angeordnet.According to FIG. 1, a pile foot cutting device 10 according to the invention comprises a cylindrical basic body 12, at the middle region of which two opposite cutting blades 14 are arranged. The cutting wings 14 are formed in the form of a cylinder jacket segment. In this case, its outer surface is a cylinder jacket segment 17, which is designed so that it can be pivoted flush into a corresponding recess on the cylindrical base body 12. For this purpose, the cutting blades 14 are articulated on one longitudinal side of the cylindrical base body 12 pivotally, while on the opposite free longitudinal side of a cutting device with a plurality of cutting teeth 26 is formed. To increase the strength of the cutting blade 14 a plurality of arcuate stiffening struts 15 are arranged on the inside thereof.

In Fig. 1 ist die erfindungsgemäße Pfahlfuß-Schneidvorrichtung 10 mit ausgeklappten Schneidflügeln 14 dargestellt. In dieser ausgeklappten Position arbeiten die Schneidzähne 26 das angrenzende Bodenmaterial bei Rotation der Vorrichtung ab, so dass ein Hohlraum für eine Pfahlfußerweiterung geschaffen wird. Das abgearbeitete Schneidmaterial wird dabei in Richtung zum zylindrischen Grundkörper 12 verdrängt und kann über die Ausnehmung für die ausgeklappten Schneidflügel 14 in einen Aufnahmeraum 16 gelangen, welcher unterhalb den Schneidflügeln 14 in dem zylindrischen Grundkörper 12 ausgebildet ist. Der Aufnahmeraum 16 ist an seiner Unterseite durch einen Deckel 18 verschließbar. Der Deckel 18 ist einerseits schwenkbar an dem zylindrischen Grundkörper 12 angelenkt und weist andererseits ein Schloss 24 auf, welches über eine Riegelbetätigung 25 verriegelt und entriegelt werden kann.In Fig. 1, the invention Pfahlfuß cutting device 10 is shown with folded blades 14. In this deployed position, the cutting teeth 26 work the adjacent soil material as the device rotates, thereby providing a cavity for a pile root extension. The processed cutting material is displaced in the direction of the cylindrical base body 12 and can pass through the recess for the folded-out cutting blades 14 into a receiving space 16, which below the cutting blades 14 in the cylindrical base body 12th is trained. The receiving space 16 is closed on its underside by a lid 18. The lid 18 is pivotally hinged on the one hand on the cylindrical base body 12 and on the other hand has a lock 24 which can be locked and unlocked via a latch actuator 25.

Beim Erstellen der Pfahlfußerweiterung ist der Deckel 18 geschlossen, so dass das abgearbeitete Bodenmaterial innerhalb des Aufnahmeraumes 16 verbleibt. Nach dem Ausbringen der Pfahlfuß-Schneidvorrichtung 10 aus dem Bohrloch kann der gefüllte Aufnahmeraum 16 durch Entriegeln des Deckels 18, wobei dieser durch das Gewicht des Bodenmaterials aufschwenkt, entleert werden. Das Verschließen des Deckels 18 kann durch eine Krafteinrichtung, von Hand oder einfach durch Aufsetzen der Pfahlfuß-Schneidvorrichtung 10 auf den Boden erfolgen.When creating the Pfahlfußerweiterung the lid 18 is closed, so that the processed soil material remains within the receiving space 16. After deploying the pile foot cutter 10 from the wellbore, the filled receiving space 16 can be emptied by unlocking the lid 18, which swings open by the weight of the soil material. The closing of the cover 18 can be done by a force device, by hand or simply by placing the pile foot cutting device 10 on the ground.

Nach Fertigstellung des Hohlraumes für die Pfahlfußerweiterung kann über ein Seelenrohr 20, welches mittig innerhalb des zylindrischen Grundkörpers 12 angeordnet ist, ein Druckausgleich über eine Austrittsöffnung 22 im Deckel 18 erfolgen. Nach dem Einschwenken der Schneidflügel 14 in eine eingeklappte Position, kann so die erfindungsgemäße Pfahlfuß-Schneidvorrichtung 10 aus dem Bohrloch gezogen werden. Die Verbindungseinrichtung 40 ist dabei im Wesentlichen ein Rohrstutzen, welcher mit Verstärkungsplatten 42 zusätzlich versteift ist. Die Verbindungseinrichtung dient auch zur drehsteifen Befestigung der Pfahlfuß-Schneidvorrichtung 10 an einem nicht dargestellten, drehend angetriebenen Bohrstrang.After completion of the cavity for the Pfahlfußerweiterung can be done via a core tube 20 which is centrally located within the cylindrical body 12, a pressure equalization via an outlet opening 22 in the lid 18. After swiveling the cutting wings 14 into a folded position, the pile-foot cutting device 10 according to the invention can thus be pulled out of the borehole. The connecting device 40 is essentially a pipe socket, which is additionally stiffened with reinforcing plates 42. The connecting device also serves for the torsionally rigid attachment of the pile foot cutting device 10 to a, not shown, rotationally driven drill string.

Die Betätigung der Schneidflügel 14 wird nachfolgend näher anhand der Figuren 2 und 3 erläutert. Im oberen Bereich des zylindrischen Grundkörpers 12 sind insgesamt je zwei Paare von Hydraulikzylindern 32 radial gegenüberliegend angeordnet. Die einzelnen Hydraulikzylinder 32 sind einerseits an der Innenseite des zylindrischen Grundkörpers 12 und andererseits an einem Schwenkhebel 35 eines Hebelmechanismus 34 angelenkt. Der Hebelmechanismus 34 und die Hydraulikzylinder 32 bilden die Betätigungseinrichtung 30 zum Ein- und Ausklappen der beiden Schneidflügel 14.The operation of the cutting blades 14 will be explained in more detail below with reference to Figures 2 and 3. In the upper region of the cylindrical base body 12 a total of two pairs of hydraulic cylinders 32 are arranged radially opposite one another. The individual hydraulic cylinders 32 are articulated on the one hand on the inside of the cylindrical base body 12 and on the other hand on a pivot lever 35 of a lever mechanism 34. The lever mechanism 34 and the hydraulic cylinders 32 form the actuating device 30 for folding in and out of the two cutting wings 14.

In der in Fig. 3 gezeigten ausgeklappten Position der Schneidflügel 14 sind die Hydraulikzylinder 32 eingefahren. Durch Ausfahren des Kolbens aller Hydraulikzylinder 32 wird der Schwenkhebel 35 verschwenkt. Der Schwenkhebel 35, welcher aus insgesamt drei Platten aufgebaut ist, ist fest mit einer rohrförmigen Buchse 36 verbunden, welche schwenkbar um das Seelenrohr 20 gelagert ist. Im unteren Bereich der Buchse 36 sind je zwei Kniehebelmechanismen 37 für einen Schneidflügel 14 vorgesehen. Der Kniehebelmechanismus 37 ist jeweils einerseits fest mit der Buchse 36 verbunden und andererseits an der Innenseite der Schwenkflügel 14 angelenkt. Durch entsprechende Druckbeaufschlagung der Hydraulikzylinder kann der Ausstellwinkel der Schwenkflügel 14 gezielt variiert und gesteuert werden.In the unfolded position of the cutting blades 14 shown in Fig. 3, the hydraulic cylinders 32 are retracted. By extending the piston of all hydraulic cylinders 32, the pivot lever 35 is pivoted. The pivot lever 35, which is composed of a total of three plates is fixedly connected to a tubular bushing 36 which is pivotally mounted about the core tube 20. In the lower region of the bush 36, two toggle mechanisms 37 for a cutting blade 14 are provided. The toggle mechanism 37 is in each case on the one hand firmly connected to the bushing 36 and on the other hand articulated on the inside of the pivoting wing 14. By appropriate pressurization of the hydraulic cylinder, the deployment angle of the swing vanes 14 can be selectively varied and controlled.

Claims (7)

  1. Pile foot cutting device for a substantially radial extension of the foot region of a pile bore with a cylindrical body (12) and cutting blades (14) constructed as cylinder shell segments of the cylindrical body (12), said cutting blades (14) being provided pivotably on the body (12) and can be swung laterally out of the same with a predeterminable blade angle, wherein a reception chamber (16) with a lid for worked out soil is provided below the outwardly swingable cutting blades (14) on the body (12),
    characterized in that
    a core tube (20) for pressure compensation purposes is provided within the body (12) and said core tube (20) issues into an outlet port (22) in the lid (18).
  2. Pile foot cutting device according to claim 1,
    characterized in that
    the reception chamber (16) at its underside can be closed by a lid (18), which is pivotably articulated to the cylindrical body (12).
  3. Pile foot cutting device according to claim 1 or 2,
    characterized in that
    in the swung out position of the cutting blades (14) the cylindrical body (12) is laterally opened, so that soil worked out by the cutting blades (14) is conveyed into the reception chamber (16).
  4. Pile foot cutting device according to one of the claims 1 to 3,
    characterized in that
    in the body (12) is provided an operating device (30) through which the cutting blades (14) can be pivoted between a swung in position and a swung out position.
  5. Pile foot cutting device according to claim 4,
    characterized in that
    the operating device (30) incorporates at least one hydraulic cylinder (32).
  6. Pile foot cutting device according to claim 4 or 5,
    characterized in that
    the operating device (30) incorporates a lever mechanism (34).
  7. Pile foot cutting device according to one of the claims 1 to 6,
    characterized in that
    on the top of the body (12) is provided a joining device (40) for a boring string, a pressure compensation line and/or a hydraulic line.
EP03006237A 2002-05-02 2003-03-20 Pile foot reamer Expired - Fee Related EP1359258B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10219759 2002-05-02
DE10219759A DE10219759B3 (en) 2002-05-02 2002-05-02 Pile foot cutter

Publications (2)

Publication Number Publication Date
EP1359258A1 EP1359258A1 (en) 2003-11-05
EP1359258B1 true EP1359258B1 (en) 2007-01-17

Family

ID=28798984

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03006237A Expired - Fee Related EP1359258B1 (en) 2002-05-02 2003-03-20 Pile foot reamer

Country Status (4)

Country Link
EP (1) EP1359258B1 (en)
DE (1) DE10219759B3 (en)
HK (1) HK1056902A1 (en)
ZA (1) ZA200302485B (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102704851A (en) * 2012-06-07 2012-10-03 三一重工股份有限公司 Bottom expanding drill bit and rotary drilling machine
CN102777125B (en) * 2012-08-14 2014-08-06 北京建研机械科技有限公司 Monitoring electrohydraulic control pile foundation enlarged base device
JP6311951B1 (en) * 2017-06-22 2018-04-18 ジャパンパイル株式会社 Drilling apparatus and drilling method for hole wall
JP7191326B2 (en) * 2019-03-27 2022-12-19 大成建設株式会社 Mechanical expansion bucket with hydraulic mechanism and pile hole excavator for intermediate expansion part

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04228797A (en) * 1991-05-28 1992-08-18 Hitachi Constr Mach Co Ltd Method for executing widened bottom pile by earth drill process
JPH094353A (en) * 1995-06-26 1997-01-07 Tamu Tec:Kk Vertical hole excavating device
JP2980855B2 (en) * 1996-12-25 1999-11-22 八郎 井上 Caisson laying method and its equipment

Also Published As

Publication number Publication date
EP1359258A1 (en) 2003-11-05
ZA200302485B (en) 2003-07-08
DE10219759B3 (en) 2004-02-12
HK1056902A1 (en) 2004-03-05

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