EP0465767B1 - Reinforced concrete foundation pile - Google Patents

Reinforced concrete foundation pile Download PDF

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Publication number
EP0465767B1
EP0465767B1 EP91104416A EP91104416A EP0465767B1 EP 0465767 B1 EP0465767 B1 EP 0465767B1 EP 91104416 A EP91104416 A EP 91104416A EP 91104416 A EP91104416 A EP 91104416A EP 0465767 B1 EP0465767 B1 EP 0465767B1
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EP
European Patent Office
Prior art keywords
flat steel
foundation pile
reinforced concrete
steel profiles
concrete foundation
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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
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EP91104416A
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German (de)
French (fr)
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EP0465767A1 (en
Inventor
Richard F. Dipl.-Ing. Forster
Friedemann A. Dipl.-Ing. Rudersdorf
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Pfleiderer Verkehrstechnik GmbH and Co KG
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Pfleiderer Verkehrstechnik GmbH and Co KG
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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
    • E02D5/24—Prefabricated piles
    • E02D5/30—Prefabricated piles made of concrete or reinforced concrete or made of steel and concrete
    • 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
    • E02D5/56—Screw piles
    • 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
    • E02D5/58—Prestressed concrete piles

Definitions

  • the invention is directed to a foundation pile made of reinforced, primarily prestressed concrete with external threads and an internal cavity for engaging the drill pipe applying the torsional force (see e.g. EP-A-0 127221).
  • the endeavor is therefore aimed at designing foundation piles of the type described at the outset in such a way that they can be produced using the known centrifugal technology in a cost-saving manner and in a quality which cannot be achieved with the production methods used hitherto. It is all about the quality of the piles to improve in that the surface quality is significantly improved and a high degree of crack freedom is achieved.
  • At least two flat steel profiles are fastened axially parallel in such a foundation pile in the pile wall at approximately the same angular distance, which project freely with about half their width into the inner cavity serving to engage the drill pipe.
  • the measure according to the invention assumes that such flat steel profiles can be precisely fixed in the centrifugal shape without major difficulties, so that when the mast is ejected, the interior of a perfectly circular cross section practically arises by itself, the flat steel profiles being anchored in the pile wall in such a way that they are anchored are anchored in the wall at about half their width and protrude into the inner cavity of the pile with the other half of their width.
  • a mast made in this way has all the advantages of centrifugal technology. It is practically crack-free and has a particularly high surface quality.
  • the threads can also be formed in a centrifugal shape of a quality not previously known.
  • the invention opens up the possibility in a simple manner of arranging the flat steel profiles in the area bearing the outer threads. In this way, as is known, the torsional forces can be transferred particularly well to the pile.
  • Another alternative is that the flat steel profiles are arranged in the upper end region of the pile. This configuration enables better handling when screwing in and allows the use of a shorter drill pipe.
  • a further embodiment of the invention are on the flat steel profiles in the area of their upper end in the inside protruding part recesses arranged for engagement of outer lugs attached to the drill pipe.
  • the drill pipe is inserted into the inner cavity of the pile until the lugs of the drill pipe face each other in recesses in the flat steel profiles.
  • the lugs engage in the recesses and, to a certain extent, lead to a connection between the drill pipe and flat steel profiles according to the bayonet lock principle.
  • tensile forces can also be transmitted from the drill pipe to the foundation pile in order to prevent the pile from being over-tightened when the torsional force is applied.
  • the drill pipe is designed such that it approximately fills the inner cavity of the pile and has longitudinal incisions for engaging the flat steel profiles. It goes without saying that these cuts and their arrangement correspond to the number and position of the flat iron profiles in the inner cavity of the pile. In this embodiment, the torsional force acts over a considerable length of the pile.
  • An alternative embodiment provides that the diameter of the drill pipe is smaller than the radial distance between the flat steel profiles and that external drivers for tangential attack on and / or for engagement in the recesses of the flat steel profiles are arranged on the drill pipe. In the former case, there is a kind of point Attack of the drill pipe on the flat steel profiles anchored in the wall of the pile.
  • the invention provides that the flat steel profiles embedded in the wall are fixed on their outer circumference by a plurality of connecting rings spaced apart in the axial direction.
  • the foundation pile 1 consists of a shaft 2 made of concrete. It is manufactured using the centrifugal process and has an external thread 4 in the area of its lower end 3 and a base plate 5 at its lower end, to which cutting knives or the like 6 can be attached.
  • two eyelets 32 are attached to the head 31 of the pile 1 and are used to handle the pile 1.
  • the wall 7 of the pile 1 has a thickness 8 which, in the embodiment shown in the drawing, projects beyond the threads 4 on the outside in the region of the lower end 3 becomes.
  • the wall 7 is provided with a reinforcement 9.
  • two flat steel profiles 10 are attached so that they are embedded with their outer half 11 in the wall 7, while their inner half 12 by the width 13 in the inner cavity 14 of the pile 1 protrudes.
  • the flat steel profiles 10 are welded to the base plate 5 at their lower end 15 in the embodiment shown here. They are also connected by three steel rings 16, 17, 18 arranged at a distance from one another and thus fixed against one another.
  • the angular spacing of the two flat steel profiles 10 is in each case 180 ° in the embodiments shown in the drawing.
  • a torque is applied to the foundation pile 1 through the drill string 20, which approximately fills the inner cavity 14 in the embodiment shown in FIG. 4.
  • the drill pipe is provided with a notch 21, which runs in the longitudinal direction and is brought into alignment with the flat steel profiles 10 when the drill pipe 20 is retracted, so that the profiles 10 when the drill pipe 20 is lowered into the notches 21 of the Intervene in the drill pipe.
  • a much thinner drill pipe 22 is used, on the outer wall 23 of which two opposing outer lugs 24 are fastened which, after the drill pipe 22 has been retracted accordingly, act on the flat steel profiles 10 during its rotation and apply their torsional force to them Profiles 10 and thus can be transferred to the shaft 2 of the pile 1.
  • the diameter 25 of this drill pipe 22 is slightly smaller than the distance 26 between the two flat steel profiles 10.
  • FIG. 6 shows an embodiment in which, in the area of the upper end 27 of the flat steel profiles 10, incisions 28 are made in an opposite arrangement in the part 12 of the flat steel profiles 10 projecting into the inner cavity.
  • outer lugs 29 are fastened, which are intended to engage in the incisions 28 in order to be able to transmit a corresponding tensile force in the direction of arrow 30 to the pile 1 from the drill string.

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  • Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Paleontology (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Piles And Underground Anchors (AREA)
  • Bulkheads Adapted To Foundation Construction (AREA)
  • Foundations (AREA)
  • Rod-Shaped Construction Members (AREA)

Abstract

The invention relates to a foundation pile (1) of reinforced, especially prestressed, concrete, having external thread turns (4) and an inner hollow space (14) for the engagement of the drill rods (20) applying the torsion force, at least two flat steel sections (10) being fastened in an axially parallel manner in the pile wall (7) at approximately the same angular spacing, which flat steel sections (10) freely project with approximately half their width into the hollow space (14) used for the engagement of the drill rods (20). <IMAGE>

Description

Die Erfindung richtet sich auf einen Gründungspfahl aus armiertem, vornehmlich vorgespannten Beton mit äußeren Gewindegängen und einem Innenhohlraum zum Eingriff des die Torsionskraft aufbringenden Bohrgestänges (Siehe z.B. EP-A-0 127221).The invention is directed to a foundation pile made of reinforced, primarily prestressed concrete with external threads and an internal cavity for engaging the drill pipe applying the torsional force (see e.g. EP-A-0 127221).

Die Herstellung solcher Pfähle bereitet erhebliche Schwierigkeiten, die zum einen auf der vor allem durch das Außengewinde komplizierten Formgebung beruhen, zum anderen aber auch auf den hohen Qualitätsansprüchen, die sich vornehmlich aus den aufzunehmenden Kräften beim Eindrehen in das Erdreich ergeben. Nicht weniger Probleme bereitet die Aufgabe, derartige Gründungspfähle in einer zur Aufnahme der erforderlichen Torsionskraft geeigneten Weise kostengünstig herzustellen. Im allgemeinen wird der Innenhohlraum mit einem mehreckigen Querschnitt versehen, in den ein analog gestaltetes Bohrgestänge eingreift. Diese Ausbildung erschwert jedoch die Herstellung dieser Pfähle außerordentlich. In dieser Hinsicht weniger problematisch ist die Verwendung einer an dem Kopf des Pfahles angebrachten Stahlplatte mit einem der Außenkontur des eingreifenden Bohrgestänges entsprechenden Ausschnitt. Die Verwendung einer solchen Kopfstahlplatte ist jedoch außerordentlich kostenintensiv. Sie muß zunächst an dem Pfahl befestigt werden. Zum anderen ist sie aber nach dem Eindrehen des Pfahles im Gebrauchszustand nicht mehr zu nutzen.The manufacture of such piles presents considerable difficulties, which are based, on the one hand, on the shape, which is complicated primarily by the external thread, and, on the other hand, on the high quality requirements that result primarily from the forces to be absorbed when screwing into the ground. The task of producing such foundation piles in a manner which is suitable for absorbing the required torsional force is no less problematic. In general, the inner cavity is provided with a polygonal cross-section, in which an analog drill pipe engages. However, this training makes the manufacture of these piles extremely difficult. In this regard, the use of a steel plate attached to the head of the pile with a cutout corresponding to the outer contour of the engaging drill pipe is less problematic. However, the use of such a head steel plate is extremely expensive. It must first be attached to the post. On the other hand, it cannot be used after the pile has been screwed in.

Das Bestreben richtet sich deshalb darauf, Gründungspfähle der eingangs bezeichneten Art so zu gestalten, daß sie unter Anwendung der bekannten Schleudertechnik kostensparend und in einer Qualität hergestellt werden können, die mit den bisher verwendeten Fertigungsmethoden nicht zu erreichen ist. Es geht vor allem darum, die Qualität der Pfähle dadurch zu verbessern, daß die Oberflächengüte entscheidend verbessert und ein hohes Maß an Rissefreiheit erzielt wird. Diese Vorzüge ergeben sich durch die Anwendung des Schleuderverfahrens und der Vorspanntechnik, welche zu einem Gründungspfahl mit einwandfrei zentrisch zu bestimmender Gestaltung des Hohlraums mit einem kreisförmigen Querschnitt führen. Um dann aber die erforderliche Torsionskraft über das Bohrgestänge aufzubringen, sind bei einem solchen Gründungspfahl in der Pfahlwandung in etwa gleichem Winkelabstand mindestens zwei Flachstahlprofile achsparallel befestigt, die mit etwa ihrer halben Breite frei in den zum Eingriff des Bohrgestänges dienenden Innenhohlraum hineinragen.The endeavor is therefore aimed at designing foundation piles of the type described at the outset in such a way that they can be produced using the known centrifugal technology in a cost-saving manner and in a quality which cannot be achieved with the production methods used hitherto. It is all about the quality of the piles to improve in that the surface quality is significantly improved and a high degree of crack freedom is achieved. These advantages result from the use of the centrifugal process and the prestressing technology, which lead to a foundation pile with a perfectly cross-sectional design of the cavity with a circular cross-section. However, in order to then apply the required torsional force via the drill pipe, at least two flat steel profiles are fastened axially parallel in such a foundation pile in the pile wall at approximately the same angular distance, which project freely with about half their width into the inner cavity serving to engage the drill pipe.

Die erfindungsgemäße Maßnahme geht davon aus, daß solche Flachstahlprofile ohne größere Schwierigkeiten in der Schleuderform exakt fixiert werden können, so daß beim Ausschleudern des Mastes der Innenraum von einwandfrei kreisförmigem Querschnitt praktisch von selbst entsteht, wobei in der Pfahlwandung die Flachstahlprofile derart verankert werden, daß sie etwa mit ihrer halben Breite in der Wand verankert sind und mit der anderen Hälfte ihrer Breite in den Innenhohlraum des Pfahls hineinragen. Ein auf diese Weise hergestellter Mast weist alle Vorteile der Schleudertechnik auf. Er ist praktisch rissefrei und weist eine besonders hohe Oberflächengüte auf. Auch lassen sich die Gewindegänge in einer Schleuderform von bisher nicht gekannter Güte ausbilden.The measure according to the invention assumes that such flat steel profiles can be precisely fixed in the centrifugal shape without major difficulties, so that when the mast is ejected, the interior of a perfectly circular cross section practically arises by itself, the flat steel profiles being anchored in the pile wall in such a way that they are anchored are anchored in the wall at about half their width and protrude into the inner cavity of the pile with the other half of their width. A mast made in this way has all the advantages of centrifugal technology. It is practically crack-free and has a particularly high surface quality. The threads can also be formed in a centrifugal shape of a quality not previously known.

Im einfachsten Fall werden in die Wandung zwei auf einem Durchmesser einander gegenüberliegende Flachprofile eingebracht. Es können aber durchaus auch drei Profile, um jeweils 120° versetzt, oder auch mehr Profile angebracht werden. Welcher Ausführungsform der Vorzug gegeben wird, richtet sich hierbei nach den Besonderheiten des Einzelfalls.In the simplest case, two flat profiles opposite one another with a diameter are introduced into the wall. However, three profiles, each offset by 120 °, or more profiles can also be attached. Which embodiment is preferred depends on the particularities of the individual case.

Die Erfindung eröffnet in einfacher Weise die Möglichkeit die Flachstahlprofile in dem die äußeren Gewindegänge tragenden Bereich anzuordnen. Auf diese Weise lassen sich, wie bekannt, die Torsionskräfte besonders gut auf den Pfahl übertragen. Eine andere Alternative besteht darin, daß die Flachstahlprofile in dem oberen Endbereich des Pfahls angeordnet sind. Diese Ausgestaltung ermöglicht eine bessere Handhabung beim Eindrehen und gestattet die Anwendung eines kürzeren Bohrgestänges.The invention opens up the possibility in a simple manner of arranging the flat steel profiles in the area bearing the outer threads. In this way, as is known, the torsional forces can be transferred particularly well to the pile. Another alternative is that the flat steel profiles are arranged in the upper end region of the pile. This configuration enables better handling when screwing in and allows the use of a shorter drill pipe.

Es liegt im Rahmen der Erfindung, bei einem Gründungspfahl mit einer Schneidmesser tragenden Fußplatte die Flachstahlprofile an dieser Fußplatte zu befestigen, vorzugsweise anzuschweißen. Die zum Eindrehen aufzubringende Torsionskraft wirkt dann unmittelbar über die Fußplatte auf den Fuß des Gründungspfahls ein. Eine demgegenüber andere Alternative verkörpert sich in dem selbständigen Erfindungsgedanken, daß bei einem Gründungspfahl der entsprechenden Gattung an der dem Innenhohlraum zugekehrten Innenfläche der Fußplatte Mitnehmeransätze zum Angriff des Bohrgestänges befestigt sind. Diese Anordnung entspricht der erstgenannten Ausführungsform, jedoch nehmen hier die aus der Pfahlwandung in den Innenhohlraum hineinragenden Flachstahlprofile nur eine extrem kurze Länge an, die in den an der Fußplatte befestigten Ansätzen zum Ausdruck kommt. Es liegt auf der Hand, daß in diesem Fall ein Bohrgestänge von entsprechend großer Länge erforderlich ist, doch hat dies den Vorzug der besseren Kraftübertragung auf die Pfahlspitze.It is within the scope of the invention to fasten, preferably to weld, the flat steel profiles to a base pile with a base plate carrying a cutting knife. The torsional force to be applied then acts directly on the base of the foundation pile via the base plate. Another alternative to this is embodied in the independent idea of the invention that, in the case of a foundation pile of the corresponding type, driver approaches for attacking the drill rod are attached to the inner surface of the base plate facing the inner cavity. This arrangement corresponds to the first-mentioned embodiment, but here the flat steel profiles protruding from the pile wall into the inner cavity only assume an extremely short length, which is expressed in the attachments attached to the base plate. It is obvious that in this case a drill pipe of a correspondingly large length is required, but this has the advantage of better power transmission to the pile tip.

In weiterer Ausgestaltung der Erfindung sind an den Flachstahlprofilen im Bereich ihres oberen Endes in dem innen überragenden Teil Ausnehmungen zum Eingriff von am Bohrgestänge angebrachten äußeren Ansätzen angeordnet. Bei dieser Ausführungsform wird das Bohrgestänges soweit in den Innenhohlraum des Pfahls eingefahren, bis die Ansätze des Bohrgestänges in Ausnehmungen der Flachstahlprofile gegenüberstehen. Durch geringfügiges Verdrehen des Bohrgestänges greifen die Ansätze in die Ausnehmungen ein und führen gewissermaßen nach dem Prinzip des Bajonettverschlusses zu einer Verbindung zwischen Bohrgestänge und Flachstahlprofilen. Auf diese Weise können auch Zugkräfte vom Bohrgestänge auf den Gründungspfahl übertragen werden, um ein zu starkes Anziehen des Pfahls beim Aufbringen der Torsionskraft zu verhindern. Damit werden die bisher üblichen Ösen am Kopf des Gründungspfahls entbehrlich, an denen entsprechende Zugmittel angreifen, um eine Zugkraft auf den Pfahl ausüben zu können. Dadurch wird die Handhabung beim Einbringen solcher Gründungspfähle erheblich vereinfacht.In a further embodiment of the invention are on the flat steel profiles in the area of their upper end in the inside protruding part recesses arranged for engagement of outer lugs attached to the drill pipe. In this embodiment, the drill pipe is inserted into the inner cavity of the pile until the lugs of the drill pipe face each other in recesses in the flat steel profiles. By slightly twisting the drill pipe, the lugs engage in the recesses and, to a certain extent, lead to a connection between the drill pipe and flat steel profiles according to the bayonet lock principle. In this way, tensile forces can also be transmitted from the drill pipe to the foundation pile in order to prevent the pile from being over-tightened when the torsional force is applied. This eliminates the hitherto usual eyelets on the head of the foundation pile, on which appropriate traction means engage in order to be able to exert a tensile force on the pile. This considerably simplifies handling when installing such foundation piles.

In weiterer Ausgestaltung des Grundgedankens der Erfindung ist das Bohrgestänge so gestaltet, daß es den Innenhohlraum des Pfahls annähernd ausfüllt und längs verlaufende Einschnitte zum Eingriff der Flachstahlprofile aufweist. Es versteht sich von selbst, daß diese Einschnitte und ihre Anordnung der Zahl und Lage der Flacheisenprofile in dem Innenhohlraum des Pfahls entsprechen. Bei dieser Ausführungsform wird die Torsionskraft über eine beachtliche Länge des Pfahls wirksam. Eine alternative Ausgestaltung sieht hingegen vor, daß der Durchmesser des Bohrgestänges kleiner ist als der radiale Abstand zwischen den Flachstahlprofilen und daß auf dem Bohrgestänge äußere Mitnehmer zum tangentialen Angriff an dem und/oder zum Eingriff in die Ausnehmungen der Flachstahlprofile angeordnet sind. Im erstgenannten Fall ergibt sich ein gewissermaßen punktförmiger Angriff des Bohrgestänges an den in der Wandung des Pfahls verankerten Flachstahlprofilen.In a further embodiment of the basic idea of the invention, the drill pipe is designed such that it approximately fills the inner cavity of the pile and has longitudinal incisions for engaging the flat steel profiles. It goes without saying that these cuts and their arrangement correspond to the number and position of the flat iron profiles in the inner cavity of the pile. In this embodiment, the torsional force acts over a considerable length of the pile. An alternative embodiment, however, provides that the diameter of the drill pipe is smaller than the radial distance between the flat steel profiles and that external drivers for tangential attack on and / or for engagement in the recesses of the flat steel profiles are arranged on the drill pipe. In the former case, there is a kind of point Attack of the drill pipe on the flat steel profiles anchored in the wall of the pile.

Die Erfindung sieht schließlich vor, daß die in die Wandung eingebetteten Flachstahlprofile an ihrem Außenumfang durch mehrere in Axialrichtung beabstandete Verbindungsringe fixiert sind.Finally, the invention provides that the flat steel profiles embedded in the wall are fixed on their outer circumference by a plurality of connecting rings spaced apart in the axial direction.

Weitere Merkmale, Einzelheiten und Vorteile der Erfindung ergeben sich aus der folgenden Beschreibung einiger bevorzugter Ausführungsformen der Erfindung sowie anhand der Zeichnung. Hierbei zeigen:

Fig. 1
einen Gründungspfahl in Seitenansicht;
Fig. 2
das untere Ende eines Gründungspfahls im Schnitt;
Fig. 3
einen Schnitt nach Linie III - III in Fig. 2;
Fig. 4
eine erste und
Fig. 5
eine zweite Ausführungsform des Bohrgestänges zum Zusammenwirken mit den in den Innenhohlraum ragenden Flachstahlprofilen und
Fig. 6
eine weitere Ausgestaltung der Erfindung im Schnitt durch das untere Ende des Pfahls.
Further features, details and advantages of the invention will become apparent from the following description of some preferred embodiments of the invention and from the drawing. Here show:
Fig. 1
a foundation pile in side view;
Fig. 2
the lower end of a foundation pile in section;
Fig. 3
a section along line III - III in Fig. 2;
Fig. 4
a first and
Fig. 5
a second embodiment of the drill pipe for cooperation with the flat steel profiles projecting into the inner cavity and
Fig. 6
a further embodiment of the invention in section through the lower end of the pile.

Der Gründungspfahl 1 besteht aus einem Schaft 2 aus Beton. Er ist im Schleuderverfahren hergestellt und trägt im Bereich seines unteren Endes 3 ein Außengewinde 4 und an seinem unteren Ende eine Fußplatte 5, an der Schneidmesser od. dgl. 6 befestigt werden können. Am Kopf 31 des Pfahls 1 sind bei der hier wiedergegebenen Ausführungsform zwei Ösen 32 angebracht, die der Hantierung des Pfahls 1 dienen. Die Wandung 7 des Pfahls 1 hat bei der in den Figuren wiedergegebenen Ausführungsformen eine Dicke 8, die bei der in der Zeichnung wiedergegebenen Ausführungsform im Bereich des unteren Endes 3 von den Gewindegängen 4 außen überragt wird. Die Wandung 7 ist mit einer Armierung 9 versehen. In die Wandung sind im Bereich des die Gewindegänge 4 tragenden unteren Endes 3 zwei Flachstahlprofile 10 so angebracht, daß sie mit ihrer äußeren Hälfte 11 in die Wandung 7 eingebettet sind, während ihre innere Hälfte 12 um die Breite 13 in den Innenhohlraum 14 des Pfahls 1 hineinragt. Die Flachstahlprofile 10 sind bei der hier wiedergegebenen Ausführungsform an ihrem unteren Ende 15 mit der Fußplatte 5 verschweißt. Sie werden darüber hinaus durch drei in Abstand voneinander angeordnete Stahlringe 16, 17, 18 verbunden und damit gegeneinander fixiert. Der Winkelabstand der beiden Flachstahlprofile 10 beträgt bei den in der Zeichnung wiedergegebenen Ausführungsformen jeweils 180°.The foundation pile 1 consists of a shaft 2 made of concrete. It is manufactured using the centrifugal process and has an external thread 4 in the area of its lower end 3 and a base plate 5 at its lower end, to which cutting knives or the like 6 can be attached. In the embodiment shown here, two eyelets 32 are attached to the head 31 of the pile 1 and are used to handle the pile 1. In the embodiment shown in the figures, the wall 7 of the pile 1 has a thickness 8 which, in the embodiment shown in the drawing, projects beyond the threads 4 on the outside in the region of the lower end 3 becomes. The wall 7 is provided with a reinforcement 9. In the wall in the region of the lower end 3 carrying the threads 4, two flat steel profiles 10 are attached so that they are embedded with their outer half 11 in the wall 7, while their inner half 12 by the width 13 in the inner cavity 14 of the pile 1 protrudes. The flat steel profiles 10 are welded to the base plate 5 at their lower end 15 in the embodiment shown here. They are also connected by three steel rings 16, 17, 18 arranged at a distance from one another and thus fixed against one another. The angular spacing of the two flat steel profiles 10 is in each case 180 ° in the embodiments shown in the drawing.

Auf den Gründungspfahl 1 wird ein Drehmoment durch das Bohrgestänge 20 aufgebracht, welches bei der in Fig. 4 wiedergegebenen Ausführungsform den Innenhohlraum 14 annähernd ausfüllt. An zwei diametral gegenüberliegenden Seiten ist das Bohrgestänge mit je einem Einschnitt 21 versehen, der in Längsrichtung verläuft und beim Einfahren des Bohrgestänges 20 mit den Flachstahlprofilen 10 zur Flucht gebracht wird, so daß die Profile 10 beim Absenken des Bohrgestänges 20 schließlich in die Einschnitte 21 des Bohrgestänges eingreifen. Bei der Ausführungsform nach Fig. 5 hingegen findet ein wesentlich dünneres Bohrgestänge 22 Anwendung, an dessen Außenwand 23 zwei einander gegenüberliegende äußere Ansätze 24 befestigt sind, die nach entsprechend weitem Einfahren des Bohrgestänges 22 bei dessen Drehung an den Flachstahlprofilen 10 angreifen und ihre Torsionskraft auf diese Profile 10 und damit auf den Schaft 2 des Pfahls 1 übertragen können. Der Durchmesser 25 dieses Bohrgestänges 22 ist geringfügig kleiner als der Abstand 26 zwischen den beiden Flachstahlprofilen 10.A torque is applied to the foundation pile 1 through the drill string 20, which approximately fills the inner cavity 14 in the embodiment shown in FIG. 4. On two diametrically opposite sides, the drill pipe is provided with a notch 21, which runs in the longitudinal direction and is brought into alignment with the flat steel profiles 10 when the drill pipe 20 is retracted, so that the profiles 10 when the drill pipe 20 is lowered into the notches 21 of the Intervene in the drill pipe. In the embodiment according to FIG. 5, on the other hand, a much thinner drill pipe 22 is used, on the outer wall 23 of which two opposing outer lugs 24 are fastened which, after the drill pipe 22 has been retracted accordingly, act on the flat steel profiles 10 during its rotation and apply their torsional force to them Profiles 10 and thus can be transferred to the shaft 2 of the pile 1. The diameter 25 of this drill pipe 22 is slightly smaller than the distance 26 between the two flat steel profiles 10.

Die Fig. 6 zeigt eine Ausführungsform, bei der im Bereich des oberen Endes 27 der Flachstahlprofile 10 in dem in den Innenhohlraum hineinragenden Teil 12 der Flachstahlprofile 10 Einschnitte 28 in gegenüberliegender Anordnung angebracht sind. In entsprechender Weise sind an dem Außenumfang 23 des Bohrgestänges 20 äußere Ansätze 29 befestigt, die zum Eingriff in die Einschnitte 28 bestimmt sind, um eine entsprechende Zugkraft in Pfeilrichtung 30 auf den Pfahl 1 vom Bohrgestänge übertragen zu können.6 shows an embodiment in which, in the area of the upper end 27 of the flat steel profiles 10, incisions 28 are made in an opposite arrangement in the part 12 of the flat steel profiles 10 projecting into the inner cavity. Correspondingly, on the outer circumference 23 of the drill string 20, outer lugs 29 are fastened, which are intended to engage in the incisions 28 in order to be able to transmit a corresponding tensile force in the direction of arrow 30 to the pile 1 from the drill string.

Claims (9)

  1. Reinforced concrete foundation pile (1) made of reinforced, in particular prestressed concrete, having male thread turns (4) and an inner cavity (14) for engagement of the boring rod for imposing torsion, characterised in that at least two flat steel profiles (10) are fixed in the pile wall (7) in an axially parallel manner and at an approximately equal angular distance, said profiles projecting with approximately half their width (12) freely into the cavity (14) for engagement of the boring rod (20, 22).
  2. Reinforced concrete foundation pile according to claim 1, characterised in that the flat steel profiles (10) are arranged in the lower region (3) bearing the male thread turns (4).
  3. Reinforced concrete foundation pile according to claim 1, characterised in that the flat steel profiles (10) are located in the upper end region.
  4. Reinforced concrete foundation pile according to claim 1, having a base plate bearing a blade, characterised in that the flat steel profiles (10) are fixed, preferably welded, to the base plate (5).
  5. Reinforced concrete foundation pile according to one of claims 1 to 3, characterised in that driver projections for the boring rod (20, 22) to act on are fixed to the inner face of the base plate (5) associated with the inner cavity (14).
  6. Reinforced concrete foundation pile according to one or more of claims 1 to 5, characterised in that recesses (28) for the engagement of external projections (29) located on the boring rod (22) are disposed at the upper end (27) of the flat steel profiles (10) in the the inner projecting part (12).
  7. Reinforced concrete foundation pile according to claims 1 to 5, characterised in that the boring rod (20) approximately fills the cross-section of the inner cavity (14) and has longitudinal notches (21) for the engagement of flat steel profiles (10).
  8. Reinforced concrete foundation pile according to claims 1 to 6, characterised in that the diameter (25) of the boring rod (22) is smaller than the radial distance (26) between the flat steel profiles (10), and external drivers (24) are disposed on the boring rod (22) for tangential engagement with the and/or engagement in the recesses (28) of the flat steel profiles.
  9. Reinforced concrete foundation pile according to at least one of claims 1 to 8, characterised in that the flat steel profiles (10) are fixed in the wall (7) by a plurality of axially spaced rings (16, 17, 18) fixed at their outer edge.
EP91104416A 1990-06-29 1991-03-21 Reinforced concrete foundation pile Expired - Lifetime EP0465767B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4020757A DE4020757C2 (en) 1990-06-29 1990-06-29 Reinforced concrete foundation pile and process for its manufacture
DE4020757 1990-06-29

Publications (2)

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EP0465767A1 EP0465767A1 (en) 1992-01-15
EP0465767B1 true EP0465767B1 (en) 1993-09-15

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EP91104416A Expired - Lifetime EP0465767B1 (en) 1990-06-29 1991-03-21 Reinforced concrete foundation pile

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US (1) US5188485A (en)
EP (1) EP0465767B1 (en)
AT (1) ATE94600T1 (en)
AU (1) AU634067B2 (en)
DE (3) DE4020757C2 (en)
DK (1) DK0465767T3 (en)
ES (1) ES2044637T3 (en)
MY (1) MY106382A (en)
NZ (1) NZ238737A (en)
YU (1) YU107991A (en)

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US5374140A (en) * 1990-07-03 1994-12-20 Standish; Peter N. Drillable ground support bolt
US6019549A (en) * 1996-06-11 2000-02-01 Corrosion Control International Llc Vortex shedding strake wraps for submerged pilings and pipes
DE19743415A1 (en) * 1997-10-01 1999-06-10 Josef Dipl Ing Behrens Self boring concrete pile
US6030150A (en) * 1998-02-25 2000-02-29 Dana A. Schmednecht Method and apparatus for constructing subterranean walls comprised of granular material
CN1246536C (en) 1998-03-10 2006-03-22 新日本制铁株式会社 Rotary burying pile and its constructing management
US6951437B2 (en) * 2004-02-20 2005-10-04 Hall David B Foundation support system and method
CN100447346C (en) * 2005-01-18 2008-12-31 周兆弟 Vein-like tubular pile

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US137744A (en) * 1873-04-08 Ichabod m
US1907811A (en) * 1931-07-01 1933-05-09 August A Hollos Anchor post
US2080181A (en) * 1935-04-02 1937-05-11 Gideon D Miller Coal undercutting machine
US2088759A (en) * 1937-02-04 1937-08-03 Central Mine Equipment Co Mining drill
FR843499A (en) * 1938-09-15 1939-07-04 Reinforced concrete tubular tapping pile with independent removable tip and combined rotation and impact device
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US3295572A (en) * 1959-05-18 1967-01-03 Hi Shear Corp Screw and screw driver coupling
US3178210A (en) * 1963-12-11 1965-04-13 Mobile Drilling Co Inc Hollow auger
US3369441A (en) * 1966-05-04 1968-02-20 Anchor Engineering Co Fastener with tapered tool engaging surfaces
US4239419A (en) * 1977-10-27 1980-12-16 Gillen William F Jr Precast concrete threaded pilings
JPS5854211B2 (en) * 1979-10-31 1983-12-03 日本サミコン株式会社 Torsion penetrating type PC spiral pile
GB2067633B (en) * 1980-01-14 1983-07-27 Lee P Concrete foundation pile
IT1147107B (en) * 1981-04-17 1986-11-19 Fondedile Spa PROCEDURE FOR THE EXECUTION OF ANNULAR CABLES FOR DIFFERENT PURPOSES, AMONG WHICH, CONSTRUCTION OF FOUNDATION SOULS WITH CORE BODY AND RELATED TOOL
NL8301556A (en) * 1983-05-03 1984-12-03 Pieter Faber CONCRETE FOUNDATION POLE, APPARATUS FOR MANUFACTURING AND APPARATUS FOR GROUNDING THEREOF.
US4543015A (en) * 1983-09-14 1985-09-24 Kruse William E Pile having wedge former
JPS60246923A (en) * 1984-05-18 1985-12-06 Daido Concrete Kogyo Kk Rotary device for foundation pile
IL76557A0 (en) * 1985-10-03 1986-02-28 Lipsker Eng Method relating to pile arrangement
DE3617025A1 (en) * 1986-05-21 1987-11-26 Delmag Maschinenfabrik PRE-PREPARED CONCRETE PILE AND METHOD AND DEVICE FOR ITS PLACING INTO THE GROUND
DE3624943A1 (en) * 1986-07-23 1988-01-28 Delmag Maschinenfabrik PRE-PREPARED CONCRETE PART AND METHOD FOR PUTTING IT INTO THE GROUND

Also Published As

Publication number Publication date
AU634067B2 (en) 1993-02-11
DK0465767T3 (en) 1994-01-03
AU7825791A (en) 1992-01-02
NZ238737A (en) 1993-05-26
DE9007428U1 (en) 1991-09-19
EP0465767A1 (en) 1992-01-15
YU107991A (en) 1995-03-27
MY106382A (en) 1995-05-30
ATE94600T1 (en) 1993-10-15
ES2044637T3 (en) 1994-01-01
DE59100377D1 (en) 1993-10-21
US5188485A (en) 1993-02-23
DE4020757C2 (en) 1996-08-01
DE4020757C1 (en) 1991-12-12

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