EP2925934B1 - Method for manufacturing a pile - Google Patents

Method for manufacturing a pile Download PDF

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Publication number
EP2925934B1
EP2925934B1 EP13802241.3A EP13802241A EP2925934B1 EP 2925934 B1 EP2925934 B1 EP 2925934B1 EP 13802241 A EP13802241 A EP 13802241A EP 2925934 B1 EP2925934 B1 EP 2925934B1
Authority
EP
European Patent Office
Prior art keywords
drill pipe
inner tube
pile
pipe
inner pipe
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.)
Active
Application number
EP13802241.3A
Other languages
German (de)
French (fr)
Other versions
EP2925934A1 (en
Inventor
Manfred RINNO
Otto NEUBAUER
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.)
Franki Grundbau & Co KG GmbH
Original Assignee
Franki Grundbau & Co KG GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Franki Grundbau & Co KG GmbH filed Critical Franki Grundbau & Co KG GmbH
Priority to PL13802241T priority Critical patent/PL2925934T3/en
Publication of EP2925934A1 publication Critical patent/EP2925934A1/en
Application granted granted Critical
Publication of EP2925934B1 publication Critical patent/EP2925934B1/en
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Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/22—Piles
    • E02D5/56—Screw piles
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D27/00—Foundations as substructures
    • E02D27/10—Deep foundations
    • E02D27/12—Pile foundations
    • 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
    • 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
    • E02D5/46—Concrete or concrete-like piles cast in position ; Apparatus for making same making in situ by forcing bonding agents into gravel fillings or the soil
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D7/00—Methods or apparatus for placing sheet pile bulkheads, piles, mouldpipes, or other moulds
    • E02D7/22—Placing by screwing down

Definitions

  • the present invention relates to a method for producing a pile, wherein both a bore and a ram takes place.
  • Piles are commonly used in construction.
  • in the field of basic construction in addition to drilling in particular piles are used, in which by means of internal or external ramming a Vortreibrohr driven into the ground / rammed.
  • a FRANKIPFAHL ® ( “FRANKIPFAHL ®” is a registered trademark of FRANKI Foundation Engineering GmbH & Co. KG, Seevetal, Germany) drilled as Vortreibrohr into the ground.
  • the pre-drive tube is aligned by means of a leader and is connected to a first winch via as a rule two ropes with a deflection arranged over a head region of the leader.
  • a ram With another rope, which is also guided over the deflection in the head area of the leader, a ram is held, which is guided in the pre-drive tube or works. If a sustainable ground is reached, serving as a closure for the ram tube closure means, for example of sandy or other material, expelled by the Rammbr to form a pile base. In addition, concrete or the like may be added. Subsequently, a reinforcement cage is set, filled with concrete and pulled the vortex tube again. It is also possible to carry out a so-called gravel pre-compaction, wherein the soil is improved in a corresponding area below and above the Pfahlabsetziefe by pounding of gravel and also slightly compacted.
  • footplate piles are produced by means of an external ramming, with pre-reaming tubes being used for producing the same, which are closed at their lower end area by a lost base plate as closure means. Techniques are also known in which the footplate is not lost.
  • a ram which can be designed in particular as a free-fall bear, diesel or hydraulic bear, the pre-drive pipe / Pipe drilled in the ground. The ram works on the head of the ram tube. The ramming is performed as in the above-described inner ramming into viable soil areas.
  • a reinforcing cage is set and the pile shaft concreted with simultaneous or subsequent, even gradual pulling the ram tube.
  • the footplate With an outer ram, the footplate may be lost, depending on the technology used. Concrete slips through the ram tube, which is now open at the bottom, and fills the pile shaft up to the outer edge of the ram tube. In this case, lost in the ground foot plate can form the footprint of the pile.
  • EP 0 598 457 A1 discloses a method for introducing a pile into a subsoil without vibrations as well as a corresponding device. The object would be to provide a method in which the load capacity of the enlarged pile base per unit area is greater than that Load-carrying capacity of prior art methods in which a reduction factor is applied to the theoretical load capacity of an enlarged pile foot.
  • a drill pipe closed at a lower end by means of a closure element which has a helical winding on its outer surface, is driven into the ground with rotation under axial pressure until the closure element has penetrated into a supporting bottom layer, then an increase takes place the distance between the lower end of the drill pipe and the tip of a fastener fastened thereto, wherein in the wellbore a prefabricated slender foundation weld is provided, the cross-section of which is appreciably smaller than that of the drill pipe, whereas the lower end of the foundation pile lies on the closure element, and wherein the closure member is a preformed cylindrical hollow displacement tip having a length of at least twice the outer diameter, said prefabricated displacement member being disposed at the end of the drill pipe and having the enlarged pile foot and wherein the distance of a lower edge of the drill pipe and the closure element is increased after penetration into the supporting soil layer, wherein the increase in the distance is caused by pressing the pile base under rotation over a distance of at least twice the outer diameter of the pile
  • both the outer and the inner ram are the associated considerable vibration. Especially in densely built-up areas, this leads to considerable damage in the immediate vicinity.
  • a method for producing a pile wherein a drill pipe with at least one drilled in a preferred lower portion of an outer wall of the same cutting spiral drilled into a particularly sustainable ground, formed by a drill pipe in the additional inner tube a Pfahlfuß, at least an end portion of the inner tube is inserted into the pile base, via the inner tube a at least one binder containing granular material is filled and the drill pipe and the inner tube are removed from the ground, the pile base is formed by réellerammung and the inner tube with its the load-bearing ground facing end End face protrudes beyond an end face of the drill pipe.
  • the drill pipe may also be referred to as a auger with a large core tube.
  • the drill pipe has a cutting helix disposed over its entire removable outer wall.
  • the cutting helix advantageously starts in the lower end region of the drill pipe on the outer wall. It is preferably attached immediately adjacent to a lower end face of the drill pipe on the outer wall and further advantageously extends into an upper end portion of the tohufbaren outer wall of the drill pipe, that is up to an upper end portion of the drill pipe below an upper opening portion, by means of which the drill pipe to a drilling device , In particular a rotary motor, is fixed, and wherein through an opening provided there material can be filled.
  • the inner tube which has no cutting helix on its outer wall, is disposed within the drill pipe.
  • the ratio of the diameter of the drill pipe to the diameter of the inner pipe, measured in each case starting from the respective outer walls of the pipes, is in a range from about 1.1: 1 to about 2.5: 1, preferably in a range between about 1.25 : 1 and about 1.75: 1.
  • An inner wall of the drill pipe is preferably sealed against the outer wall of the inner tube with at least one sealant.
  • the sealant is to serve the function of preventing the penetration of ground into the area between the inner wall of the drill pipe and the outer wall of the inner tube.
  • the sealing means may for example be designed as a ring seal, wherein the sealing profile may be executed in cross-section double dovetail-shaped or single dovetail. However, other embodiments of the sealant are possible.
  • the sealing means is advantageously arranged fixedly on the inner wall of the drill pipe, but may also be arranged fixedly on the outer wall of the inner pipe.
  • the sealant may be made of any suitable material, in particular of high strength, nevertheless still a sufficient elasticity having plastic materials, such as filler-reinforced rubber materials or the like.
  • a plurality of sealing means can also be arranged over the length of the drill pipe or of the inner pipe on its inner wall or outer wall.
  • the inner tube can already before starting the drilling with an end face, which faces the ground, over an end face of the drill pipe, which also faces the ground, survive.
  • the projection between the end-side end surface of the inner tube and the end-side end face of the drill pipe is preferably in a range between about 20 cm and 200 cm, more preferably in a range between about 50 cm and about 120 cm, but may also be greater than 200 in some ground situations cm.
  • the supernatant can also be generated only after reaching a final depth in the ground by appropriate displacement of the inner tube in relation to the drill pipe.
  • the displacement can be effected by rotational movements or by a longitudinal, non-rotating sliding movement and / or both by inner or top ridge.
  • the inner tube is driven by inner ram to a sustainable ground, while the drill pipe is sunk to a certain depth. Also, e.g. the inner tube and the drill pipe are sunk only in a sustainable ground, and then a supernatant are formed by further sinking of the inner tube by inner ram.
  • the pile base produced by the inventive method is prepared according to the principle of the FRANKIPFAHL ®.
  • the pile base is formed by inner ramming, which can also be addressed as réellerohrrammung.
  • a head ridge by means of hydraulic or diesel bears would be possible.
  • a rammer is introduced into the inner tube in an inner ramming, more preferably the ram is placed on a closure means, which is arranged in the end region of the drill pipe and / or inner pipe facing the load-bearing ground.
  • the ram is used advantageously in the clamped state.
  • the rest on the closure means can be done before the sinking, more preferably it takes place during the sinking of the drill pipe, more preferably a circulation of the ram takes place both before the sinking and during the drilling to the achievement of a final felling.
  • the pile root is advantageously formed by granular material present in the inner tube, which may also be mixed with a binder, and preferably is dry concrete, and ultimately can also serve as a closure means, as described below, by an inner ramming, wherein the process can be repeated by adding further batches of the granular material until the pile has been made to a desired length, whereby ultimately the length of the pile base can be varied or adjusted.
  • the pile root has an outer diameter which is the outer wall of the inner tube, and further preferably also overtops the outer wall of the drill pipe.
  • the drilling preferably takes place up to a load-bearing ground by means of the drill pipe, as already mentioned above, advantageously providing at least one closure means in the supporting ground facing end region of the drill pipe and / or inner tube.
  • a closure means may be provided, for example, a foot plate, which may also be designed as lost, but also recoverable as foot plate.
  • a type of lid may also be provided, e.g. seen in cross section as an upside down triangle can be addressed.
  • An alternative closure means is the provision of a plug of gravel and / or sand and / or a granular material having at least one binder, in particular concrete, in particular dry concrete, by means of which the drill pipe and / or the inner pipe is closed.
  • a foot plate or lid as closure means are preferably arranged on the ground facing the end region of the drill pipe, in particular fixed. In addition, they can also be arranged at the end region of the inner tube, in particular at the end face of the same.
  • the foot plate or the cover are arranged at the end region of the drill pipe so that they do not project beyond the outer wall of the drill pipe.
  • the pile base is formed solely by the inner tube.
  • the drill pipe is there as low as possible to bring a hole in the ground, preferably down to the load-bearing ground.
  • the inner tube thus also determines significantly the pile diameter, which will correspond approximately to the inner diameter of the inner tube.
  • the pile produced by the method according to the invention over its entire length has a pile diameter approximately at the inner diameter of the inner tube.
  • the inner tube is removed from the ground in the course of the introduction of material until its end face no longer dominates that of the drill pipe, so that then at this point a pile diameter expansion can take place, especially if the inner tube is completely removed from the ground, while the Drill tube remains in this and material is then poured over this to form the pile.
  • the drilling is done by screwing the drill pipe into a particularly sustainable subsoil. It is advantageously introduced together with the drill pipe, the inner tube to the ground. Particularly preferably, the inner tube is rotated during insertion. More preferably, the rotation takes place during the drilling movement of the drill pipe.
  • a control is provided such that the rotational movement of the drill pipe and the inner tube are synchronized with each other.
  • the inner tube preferably does not have any drive during drilling, which generates a torque that is then transmitted via the inner tube into the upcoming floor.
  • the inner tube may be provided on removal from the ground with a drive.
  • An entrainment of the inner tube (rotating, sliding, sliding, vibrating, etc.) during drilling is preferably carried out by the movement of the drill pipe.
  • the inner tube is firmly held by the drill pipe via the sealant or the inner tube rotating with the drill pipe when adjusting a projection before sinking then without the need for additional control due to the entrainment over the or the sealant moved into the ground.
  • flushing aids are introduced through the inner tube, for example bentonite suspensions, water or the like.
  • the flushing aids which are introduced via an upper opening of the inner tube and / or drill pipe, for example by means of hoses in this, and can emerge provided in the wall of the inner tube openings, the Abteufen can be accelerated and also the pile performance can be improved.
  • the material used as a rinse aid also contains a binder, also the surrounding soil can be solidified.
  • the rinsing aids can be used both during drilling, as well as during and after reaching the final depth and the subsequent removal of the drill pipe and the inner tube from the ground.
  • the inner tube can be attached to a leader, which also guides the drill pipe, above the drill pipe.
  • the drill pipe is provided with a closure means, and the inner pipe is arranged in its lower end region via a sealing means between outer wall of the inner pipe and inner wall of the drill pipe, but the sealant does not transmit the rotary movement of the drill pipe to the inner pipe, because not sufficiently firmly arranged on this.
  • the inner tube above the at least one sealant the drill pipe when drilling or tracked and only when reaching the Endteufe to achieve the supernatant in relation to the drill pipe in the direction of the load-bearing soil are moved, so then then the at least a sealant comes to rest on the outer wall of the inner tube.
  • the inner tube and / or the drill pipe can also have spacing and guide means, which facilitate guide of the inner tube in the drill pipe, arranged on its outer wall.
  • the pile base can be produced according to the method of the invention without such a projection being provided between the end-side end face of the inner tube and the end-side end face of the drill pipe, but can also be produced if a projection of the inner tube is provided.
  • a projection of the inner tube is provided following the formation of the pile base by preferably stamping either the supernatant between end-side end face of the inner tube and end-side end face of the drill pipe is enlarged or maintained and introduced the inner tube in the pile base, possibly with Mitverschiebung the drill pipe, or it is by producing the supernatant the Inner tube led into the pile foot.
  • the introduction of the inner tube in the pile base can be done in rotation or by a longitudinal sliding movement of the inner tube, for example by ramming, in the direction of the pile base.
  • the inner tube and the drill pipe in addition to the inner tube and the drill pipe can be moved, preferably to the pile base, preferably by a rotating movement.
  • the introduction of the inner tube in the pile base is advantageously carried out at least until the end face of the drill pipe rests on the surface of the pile base.
  • the removal of the drill pipe and the inner pipe from the ground can be done in various ways.
  • the removal is carried out by pulling and / or rotating the drill pipe and / or inner tube.
  • the inner tube is removed together with the drill pipe from the ground, in particular pulled.
  • the inner tube initially remains in the ground, while the drill pipe is removed by pulling or turning out of the ground.
  • the inner tube is first removed while the drill pipe remains in the ground.
  • a reinforcement cage is set in the inner tube or the drill pipe during or before the filling of the granular material having at least one binder.
  • the reinforcing cage is advantageously set in the inner tube or the drill pipe prior to the beginning of the filling of the granular material, preferably concrete, having at least one binder.
  • the removal of the drill pipe and the inner tube can be carried out such that the supernatant of the inner tube remains in the removal.
  • the supernatant for example, during the removal by an additional movement of the inner tube relative to the drill pipe, as far as they are removed together from the ground, can be reduced towards a bottom surface or returned to zero, so that an end-side end face the inner tube comes to lie at least on the same level as an end-side end face of the drill pipe or even arranged with a recess within the drill pipe.
  • the drill pipe can be removed by pulling or by turning from the ground, as well as the inner tube.
  • piles are provided which have no weakening above the pile base.
  • shank diameters for example, a larger near-surface and a lesser in the area above the pile base, are generated to make the energy and material entry economically.
  • Gravel precompression is also possible with the method according to the invention.
  • the inner tube in its lower end region, which faces the ground have a widening.
  • This expansion can also serve as a guide means of the inner tube in the drill pipe.
  • the expansion of the inner tube may also be equal to the outer diameter of the drill pipe, or project beyond this. Due to the expansion can be achieved when filling at least one binder-containing granular material in the inner tube at the same distance from the viable and unsustainable ground, whether by turning or pulling, a broadened pile diameter.
  • the connection of the pile to the pile base is thereby improved.
  • the drill pipe is first pulling or rotating, preferably pulling, removed from the ground, and subsequently the inner tube.
  • the method according to the invention can be provided with a device for producing a drilled pile with a pile base, comprising a drill pipe and an inner pipe arranged therein, wherein at least between an outer wall of the inner pipe and an inner wall of the drill pipe a sealing means is arranged to prevent the penetration of in particular non-load-bearing and / or load-bearing ground.
  • the device according to the invention further advantageously has a projection between an end-side end face of the inner tube and an end-side end face of the drill pipe, so that the inner pipe protrudes beyond the drill pipe facing the ground.
  • the sealing means may be formed as already described above in connection with the method according to the invention.
  • the inner tube is advantageously attached via a holding device, preferably a leader, above the upper edge of the drill pipe.
  • the drill pipe can be formed in the device according to the invention as shown in connection with the method according to the invention, and in particular have at least one cutting helix.
  • Closure means may also be provided, for example in the form of lost or not lost footplates which are fastened to the drill pipe, or as grafts, as also described in connection with the method according to the invention.
  • Fig. 1A now shows in Section A an inventive device 10, in which an inner tube 14 is disposed in a drill pipe 12.
  • Drill pipe 12 and inner tube 14 are attached to a leader 20.
  • a ram 22, held by a cable 24 on the leader 20 is held by a winch, not shown here, and rests on a closure means 28 formed as a plug formed, for example, from gravel or dry concrete.
  • the drill pipe 12 has an outer wall 13, on which a cutting helix 18, which is arranged starting from an end-side end face 52 on the outer wall 13 to the upper region below the attachment of the drill pipe 12 at the broker 20, is arranged.
  • the closure means 28 is in the lower End region of the drill pipe 12 is arranged, and may alternatively or additionally be formed as a plate or lid.
  • the device 10 rests on a bottom surface 60. Below the ground surface 60 is a groundwater level 30 within a non-load-bearing ground 32, below the unsustainable ground 32 is a sustainable ground 34.
  • Fig. 1 B / C is drilled in section B, the drill pipe 12 rotating in the ground 32 and 34, wherein the rotational movement is illustrated by the arrows 36.1 and 36.2.
  • the inner tube 14 is thereby driven drive-free of the drill pipe 12, and is moreover via a arranged between an outer wall 17 of the inner tube 14 and an inner wall 11 of the drill pipe 12 sealant 16, preferably in the form of a ring, against ingress of ground 32, 34 in the area between outer wall 17 of the inner tube 14 and inner wall 11 of the drill pipe 12 is protected.
  • Dry concrete can also be filled into the inner tube 14 for the production of the pile base, for example, several times, which is then stamped with the material of the plug 28, if present, and forms the pile base 46.
  • the inner tube becomes 14 in the pile base 46 advanced until a projection 26 between a terminal end face 54 of the inner tube 14 and an end face 52 of the drill pipe 12 is formed, which is for example 100 cm.
  • the Rammbär 22 is removed from the inner tube 14, and as at least one binder exhibiting granular material, for example, in particular liquid concrete 44, symbolized by the arrow, in the inner tube and / or drill pipe 12, 14 filled into the pile base 46.
  • a reinforcement cage 42 as in section D of Fig. 1 D / E shown before filling the concrete 44, but also at the same time or during the filling of the concrete 44 in the drill pipe 12 or inner tube 14 are set.
  • the drill pipe 12 is removed by pulling in the direction of an arrow 40 from the ground 32, 34 together with the inner tube 14, as in section D of Fig. 1 D / E shown, so that a stake 50, as described in section E of Fig. 1 D / E shown, trains.
  • This has a pile base 46, which passes without any weakening above the pile base 46 in a pile shaft 51.

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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)
  • Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)

Description

Die vorliegende Erfindung betrifft ein Verfahren zur Herstellung eines Pfahls, wobei sowohl eine Bohrung als auch eine Rammung erfolgt.The present invention relates to a method for producing a pile, wherein both a bore and a ram takes place.

Pfähle finden allgemein im Bauwesen vielfach Anwendung. Insbesondere im Bereich des Grundbaus kommen neben Bohr- insbesondere Rammpfähle zum Einsatz, bei welchen mittels Innen- oder Außenrammung ein Vortreibrohr in den Baugrund eingetrieben/gerammt wird. Mittels der sogenannten "Innenrammung" wird beispielsweise ein FRANKIPFAHL® ("FRANKIPFAHL®" ist eine eingetragene Marke der FRANKI Grundbau GmbH & Co. KG, Seevetal, Deutschland) als Vortreibrohr in den Baugrund abgeteuft. Das Vortreibrohr wird dabei mittels eines Mäklers ausgerichtet und ist über in aller Regel zwei Seile mit einer über einen Kopfbereich des Mäklers angeordneten Umlenkung mit einer ersten Winde verbunden. Mit einem weiteren Seil, welches ebenfalls über die Umlenkung im Kopfbereich des Mäklers geführt ist, ist ein Rammbär gehalten, welcher im Vortreibrohr geführt ist bzw. arbeitet. Wird tragfähiger Baugrund erreicht, wird ein als Verschluss für das Rammrohr dienendes Verschlussmittel, beispielsweise aus sandigem oder anderem Material, mittels des Rammbären ausgetrieben zur Bildung eines Pfahlfußes. Dabei kann zusätzlich Beton oder ähnliches zugegeben werden. Anschließend wird ein Bewehrungskorb eingestellt, Beton eingefüllt und das Vortreibrohr dabei wieder gezogen. Dabei ist es auch möglich, eine sogenannte Kies-Vorverdichtung durchzuführen, wobei der Boden in einem entsprechenden Bereich unterhalb und oberhalb der Pfahlabsetztiefe durch Ausstampfen von Kies verbessert und auch etwas verdichtet wird.Piles are commonly used in construction. In particular, in the field of basic construction in addition to drilling in particular piles are used, in which by means of internal or external ramming a Vortreibrohr driven into the ground / rammed. By means of the so-called "Innenrammung" For example, a FRANKIPFAHL ® ( "FRANKIPFAHL ®" is a registered trademark of FRANKI Foundation Engineering GmbH & Co. KG, Seevetal, Germany) drilled as Vortreibrohr into the ground. In this case, the pre-drive tube is aligned by means of a leader and is connected to a first winch via as a rule two ropes with a deflection arranged over a head region of the leader. With another rope, which is also guided over the deflection in the head area of the leader, a ram is held, which is guided in the pre-drive tube or works. If a sustainable ground is reached, serving as a closure for the ram tube closure means, for example of sandy or other material, expelled by the Rammbären to form a pile base. In addition, concrete or the like may be added. Subsequently, a reinforcement cage is set, filled with concrete and pulled the vortex tube again. It is also possible to carry out a so-called gravel pre-compaction, wherein the soil is improved in a corresponding area below and above the Pfahlabsetziefe by pounding of gravel and also slightly compacted.

Im Unterschied zu der vorstehend beschriebenen Innenrammung werden mittels einer Außenrammung beispielsweise Fußplattenpfähle hergestellt, wobei zur Herstellung derselben Vortreibrohre Einsatz finden, welche an ihrem unteren Endbereich durch eine verlorengegangene Fußplatte als Verschlussmittel verschlossen werden. Es sind auch Techniken bekannt, bei welchen die Fußplatte nicht verloren geht. Unter Zuhilfenahme eines Mäklers wird über einen Rammbären, welcher insbesondere als Freifallbär, Diesel- oder Hydraulikbär ausgebildet sein kann, das Vortreibrohr/Rammrohr in den Baugrund abgeteuft. Der Rammbär arbeitet dabei auf dem Kopf des Rammrohres. Die Rammung wird wie bei der oben beschriebenen Innenrammung bis in tragfähige Bodenbereiche geführt. Anschließend wird ein Bewehrungskorb eingestellt und der Pfahlschaft betoniert unter gleichzeitigen oder nachfolgendem, auch schrittweisem Ziehen des Rammrohrs. Bei einer Außenrammung geht die Fußplatte dabei unter Umständen verloren, je nach eingesetzter Technologie. Durch das jetzt unten offene Rammrohr rutscht Beton nach und füllt den Pfahlschaft etwa bis zur Außenkante des Rammrohrs aus. Dabei kann die im Boden verlorengegangene Fußplatte die Aufstandsfläche des Pfahls bilden.In contrast to the inner ridge described above, for example, footplate piles are produced by means of an external ramming, with pre-reaming tubes being used for producing the same, which are closed at their lower end area by a lost base plate as closure means. Techniques are also known in which the footplate is not lost. With the help of a Mäklers is about a ram, which can be designed in particular as a free-fall bear, diesel or hydraulic bear, the pre-drive pipe / Pipe drilled in the ground. The ram works on the head of the ram tube. The ramming is performed as in the above-described inner ramming into viable soil areas. Subsequently, a reinforcing cage is set and the pile shaft concreted with simultaneous or subsequent, even gradual pulling the ram tube. With an outer ram, the footplate may be lost, depending on the technology used. Concrete slips through the ram tube, which is now open at the bottom, and fills the pile shaft up to the outer edge of the ram tube. In this case, lost in the ground foot plate can form the footprint of the pile.

EP 0 598 457 A1 offenbart ein Verfahren zum Einbringen eines Pfahles in einen Untergrund ohne Vibrationen als auch eine entsprechende Vorrichtung. Aufgabe wäre es, ein Verfahren zur Verfügung zu stellen, bei dem die Tragfähigkeit des vergrößerten Pfahlfußes je Flächeneinheit größer ist als die Tragfähigkeit aus dem Stand der Technik bekannter Verfahren, bei welchen ein Reduktionsfaktor auf die theoretische Tragfähigkeit eines vergrößerten Pfahlfußes angewandt wird. Bei dem dort offenbarten Verfahren wird ein an einem unteren Ende mittels eines Verschlusselementes verschlossenes Bohrrohr, welches auf seiner Außenfläche eine schraubenförmige Wicklung aufweist, mit Drehung unter axialem Druck in den Boden eingetrieben, bis das Verschlusselement in eine tragende Bodenschicht eingedrungen ist, anschließend erfolgt eine Erhöhung des Abstandes zwischen dem unteren Ende des Bohrrohres und der Spitze eines daran befestigten Verschlusselementes, wobei in dem Bohrloch ein vorgefertigter schlanker Gründungsfahl vorgesehen wird, dessen Querschnitt merklich kleiner ist als der des Bohrrohres, wohingegen das untere Ende des Gründungspfahles auf dem Verschlusselement zu liegen kommt, und wobei das Verschlusselement eine vorgeformte zylindrische, hohle Verdrängungsspitze ist mit einer Länge von wenigstens dem zweifachen Außendurchmesser, wobei dieses vorgefertigte Verdrängungselement am Ende des Bohrrohres angeordnet ist und den vergrößerten Pfahlfuß bildet, und wobei der Abstand einer unteren Kante des Bohrrohres und des Verschlusselementes vergrößert wird nach Eindringen in die tragende Bodenschicht, wobei die Vergrößerung des Abstandes verursacht wird durch Drücken des Pfahlfußes unter Drehung über eine Strecke von wenigstens dem zweifachen Außendurchmesser des Pfahlfußes in die tragende Bodenschicht. EP 0 598 457 A1 discloses a method for introducing a pile into a subsoil without vibrations as well as a corresponding device. The object would be to provide a method in which the load capacity of the enlarged pile base per unit area is greater than that Load-carrying capacity of prior art methods in which a reduction factor is applied to the theoretical load capacity of an enlarged pile foot. In the method disclosed therein, a drill pipe closed at a lower end by means of a closure element, which has a helical winding on its outer surface, is driven into the ground with rotation under axial pressure until the closure element has penetrated into a supporting bottom layer, then an increase takes place the distance between the lower end of the drill pipe and the tip of a fastener fastened thereto, wherein in the wellbore a prefabricated slender foundation weld is provided, the cross-section of which is appreciably smaller than that of the drill pipe, whereas the lower end of the foundation pile lies on the closure element, and wherein the closure member is a preformed cylindrical hollow displacement tip having a length of at least twice the outer diameter, said prefabricated displacement member being disposed at the end of the drill pipe and having the enlarged pile foot and wherein the distance of a lower edge of the drill pipe and the closure element is increased after penetration into the supporting soil layer, wherein the increase in the distance is caused by pressing the pile base under rotation over a distance of at least twice the outer diameter of the pile base in the supporting soil layer ,

Nachteilig an den vorstehend beschriebenen Verfahren sowohl der Außen- als auch der Innenrammung sind die damit einhergehenden erheblichen Erschütterung. Besonders in dicht bebauten Gebieten führt diese zu erheblichen Beeinträchtigungen in der unmittelbaren Umgebung.A disadvantage of the method described above, both the outer and the inner ram are the associated considerable vibration. Especially in densely built-up areas, this leads to considerable damage in the immediate vicinity.

Es ist Aufgabe der vorliegenden Erfindung, ein Verfahren zur Herstellung eines Pfahls zur Verfügung zu stellen, mit welchem insbesondere Erschütterungen vermindert werden.It is an object of the present invention to provide a method for producing a pile, with which, in particular, vibrations are reduced.

Diese Aufgabe wird erfindungsgemäß gelöst durch ein Verfahren zur Herstellung eines Pfahls, wobei ein Bohrrohr mit mindestens einer in einem bevorzugt unteren Teilabschnitt einer Außenwandung derselben angeordneten Schneidwendel bis in einen insbesondere tragfähigen Baugrund gebohrt, durch ein im Bohrrohr anordbares, zusätzliches Innenrohr ein Pfahlfuß ausgebildet, zumindest ein Endbereich des Innenrohrs in den Pfahlfuß eingeführt, über das Innenrohr ein mindestens ein Bindemittel aufweisendes körniges Material eingefüllt wird und das Bohrrohr und das Innenrohr aus dem Baugrund entfernt werden, wobei der Pfahlfuß durch Innenrammung ausgebildet wird und das Innenrohr mit seiner dem tragfähigen Baugrund zugewandten endseitigen Stirnfläche über eine endseitige Stirnfläche des Bohrrohres übersteht.This object is achieved by a method for producing a pile, wherein a drill pipe with at least one drilled in a preferred lower portion of an outer wall of the same cutting spiral drilled into a particularly sustainable ground, formed by a drill pipe in the additional inner tube a Pfahlfuß, at least an end portion of the inner tube is inserted into the pile base, via the inner tube a at least one binder containing granular material is filled and the drill pipe and the inner tube are removed from the ground, the pile base is formed by Innenrammung and the inner tube with its the load-bearing ground facing end End face protrudes beyond an end face of the drill pipe.

Das Bohrrohr kann auch als Bohrschnecke mit einem großen Seelenrohr bezeichnet werden. Vorzugsweise weist das Bohrrohr über seine gesamte abteufbare Außenwandung angeordnet eine Schneidwendel auf. Dabei können auch zwei, drei oder vier Schneidwendeln vorgesehen sein. Die Schneidwendel setzt vorteilhafterweise im unteren Endbereich des Bohrrohrs an der Außenwandung an. Sie ist bevorzugt unmittelbar benachbart einer unteren Stirnfläche des Bohrrohrs an der Außenwandung angesetzt und verläuft weiter vorteilhaft bis in einen oberen Endbereich der abteufbaren Außenwandung des Bohrrohrs, das heißt bis in einen oberen Endbereich des Bohrrohrs unterhalb einem oberen Öffnungsbereich, mittels welchem das Bohrrohr an einer Bohrvorrichtung, insbesondere einem Drehmotor, befestigt ist, und wobei durch eine dort vorgesehene Öffnung Material eingefüllt werden kann.The drill pipe may also be referred to as a auger with a large core tube. Preferably, the drill pipe has a cutting helix disposed over its entire removable outer wall. In this case, two, three or four cutting spirals can be provided. The cutting helix advantageously starts in the lower end region of the drill pipe on the outer wall. It is preferably attached immediately adjacent to a lower end face of the drill pipe on the outer wall and further advantageously extends into an upper end portion of the abgehufbaren outer wall of the drill pipe, that is up to an upper end portion of the drill pipe below an upper opening portion, by means of which the drill pipe to a drilling device , In particular a rotary motor, is fixed, and wherein through an opening provided there material can be filled.

Das Innenrohr, welches an seiner Außenwandung keine Schneidwendel aufweist, wird innerhalb des Bohrrohrs angeordnet. Das Verhältnis des Durchmessers des Bohrrohrs zu dem Durchmesser des Innenrohrs, gemessen jeweils ausgehend von den jeweiligen Außenwandungen der Rohre, liegt in einem Bereich von etwa 1,1:1 bis etwa 2,5:1, bevorzugt in einem Bereich zwischen etwa 1,25:1 und etwa 1,75:1.The inner tube, which has no cutting helix on its outer wall, is disposed within the drill pipe. The ratio of the diameter of the drill pipe to the diameter of the inner pipe, measured in each case starting from the respective outer walls of the pipes, is in a range from about 1.1: 1 to about 2.5: 1, preferably in a range between about 1.25 : 1 and about 1.75: 1.

Eine Innenwandung des Bohrrohrs ist vorzugsweise gegen die Außenwandung des Innenrohrs mit mindestens einem Dichtmittel abgedichtet. Das Dichtmittel soll der Funktion dienen, das Eindringen von Baugrund in den Bereich zwischen der Innenwandung des Bohrrohrs und der Außenwandung des Innenrohrs zu verhindern. Das Dichtmittel kann beispielsweise ausgeführt sein als Ringdichtung, wobei das Dichtungsprofil im Querschnitt doppel-schwalbenschwanzförmig oder einfachschwalbenschwanzförmig ausgeführt sein kann. Jedoch sind auch andere Ausgestaltungen des Dichtmittels möglich. Das Dichtmittel ist vorteilhafter Weise fest an der Innenwandung des Bohrrohrs angeordnet, kann jedoch auch fest an der Außenwandung des Innenrohrs angeordnet sein. Das Dichtmittel kann aus jedem möglichen geeigneten Material hergestellt sein, insbesondere aus hochfesten, gleichwohl noch eine hinreichende Elastizität aufweisenden Kunststoffmaterialien, beispielsweise füllstoffverstärkten Gummimaterialen oder ähnlichem. Insbesondere können auch mehrere Dichtmittel über die Länge des Bohrrohrs bzw. des Innenrohrs an deren Innenwandung bzw. Außenwandung angeordnet sein.An inner wall of the drill pipe is preferably sealed against the outer wall of the inner tube with at least one sealant. The sealant is to serve the function of preventing the penetration of ground into the area between the inner wall of the drill pipe and the outer wall of the inner tube. The sealing means may for example be designed as a ring seal, wherein the sealing profile may be executed in cross-section double dovetail-shaped or single dovetail. However, other embodiments of the sealant are possible. The sealing means is advantageously arranged fixedly on the inner wall of the drill pipe, but may also be arranged fixedly on the outer wall of the inner pipe. The sealant may be made of any suitable material, in particular of high strength, nevertheless still a sufficient elasticity having plastic materials, such as filler-reinforced rubber materials or the like. In particular, a plurality of sealing means can also be arranged over the length of the drill pipe or of the inner pipe on its inner wall or outer wall.

Das Innenrohr kann bereits vor Beginn des Abteufens mit einer endseitigen Stirnfläche, welche dem Baugrund zugewandt ist, über eine endseitige Stirnfläche des Bohrrohrs, welche ebenfalls dem Baugrund zugewandt ist, überstehen. Der Überstand zwischen der endseitigen Stirnfläche des Innenrohrs und der endseitigen Stirnfläche des Bohrrohrs liegt bevorzugt in einem Bereich zwischen etwa 20 cm und 200 cm, weiter bevorzugt in einem Bereich zwischen etwa 50 cm und etwa 120 cm, kann jedoch bei manchen Baugrundsituationen auch größer als 200 cm sein. Der Überstand kann jedoch auch erst nach Erreichen einer Endteufe im Baugrund durch entsprechende Verschiebung des Innenrohrs im Verhältnis zum Bohrrohr erzeugt werden. Die Verschiebung kann dabei durch Drehbewegungen oder durch eine longitudinale, nicht drehende Schiebe-Bewegung und/oder sowohl durch Innen- oder Kopframmung erfolgen. Es kann zur Erzeugung eines Überstandes auch vorgesehen sein, dass das Innenrohr durch Innenrammung bis in einen tragfähigen Baugrund getrieben wird, während das Bohrrohr bis zu einer gewissen Tiefe abgeteuft wird. Auch kann z.B. das Innenrohr und das Bohrrohr nur bis in einen tragfähigen Baugrund abgeteuft werden, und dann ein Überstand durch weiteres Abteufen des Innenrohrs durch Innenrammung gebildet werden.The inner tube can already before starting the drilling with an end face, which faces the ground, over an end face of the drill pipe, which also faces the ground, survive. The projection between the end-side end surface of the inner tube and the end-side end face of the drill pipe is preferably in a range between about 20 cm and 200 cm, more preferably in a range between about 50 cm and about 120 cm, but may also be greater than 200 in some ground situations cm. However, the supernatant can also be generated only after reaching a final depth in the ground by appropriate displacement of the inner tube in relation to the drill pipe. The displacement can be effected by rotational movements or by a longitudinal, non-rotating sliding movement and / or both by inner or top ridge. It may also be provided for generating a supernatant that the inner tube is driven by inner ram to a sustainable ground, while the drill pipe is sunk to a certain depth. Also, e.g. the inner tube and the drill pipe are sunk only in a sustainable ground, and then a supernatant are formed by further sinking of the inner tube by inner ram.

Der mittels des erfindungsgemäßen Verfahrens hergestellte Pfahlfuß wird nach dem Prinzip des FRANKIPFAHL® hergestellt. Erfindungsgemäß wird der Pfahlfuß durch Innenrammung ausgebildet, die auch als Innenrohrrammung angesprochen werden kann. Eine Kopframmung mittels Hydraulik- oder Dieselbären wäre möglich. Bevorzugt wird bei einer Innenrammung ein Rammbär in das Innenrohr eingeführt, weiter bevorzugt wird der Rammbär auf ein Verschlussmittel, welches in dem dem tragfähigen Baugrund zugewandten Endbereich des Bohrrohrs und/oder Innenrohrs angeordnet ist, aufgelegt. Der Rammbär wird vorteilhafter Weise im verspannten Zustand eingesetzt. Die Auflage auf das Verschlussmittel kann bereits vor dem Abteufen erfolgen, weiter bevorzugt erfolgt sie während dem Abteufen des Bohrrohrs, weiter bevorzugt erfolgt eine Auflage des Rammbären sowohl vor dem Abteufen als auch während des Abteufens bis zur Erreichung einer Endteufe.The pile base produced by the inventive method is prepared according to the principle of the FRANKIPFAHL ®. According to the invention the pile base is formed by inner ramming, which can also be addressed as Innenrohrrammung. A head ridge by means of hydraulic or diesel bears would be possible. Preferably, a rammer is introduced into the inner tube in an inner ramming, more preferably the ram is placed on a closure means, which is arranged in the end region of the drill pipe and / or inner pipe facing the load-bearing ground. The ram is used advantageously in the clamped state. The rest on the closure means can be done before the sinking, more preferably it takes place during the sinking of the drill pipe, more preferably a circulation of the ram takes place both before the sinking and during the drilling to the achievement of a final felling.

Der Pfahlfuß wird vorteilhafterweise abgebildet, indem im Innenrohr vorliegendes körniges Material, das auch mit einem Bindemittel versetzt sein kann, und bevorzugt trockener Beton ist, und letztlich auch als ein Verschlußmittel dienen kann, wie nachfolgend beschrieben, durch eine Innenrammung bzw. Innenrohrrammung ausgestampft wird, wobei durch Zugabe weiterer Chargen vom körnigen Material der Vorgang wiederholt werden kann, bis die Rammung über eine gewünschte Länge erfolgt ist, wodurch letztendlich die Länge des Pfahlfußes variiert bzw. eingestellt werden kann. Vorzugsweise weist der Pfahlfuß einen Außendurchmesser auf, der die Außenwandung des Innenrohrs, und weiter bevorzugt auch die Außenwandung des Bohrrohrs überragt. Durch das Eintreiben des Innenrohrs in den Pfahlfuß wird vorzugsweise eine Pfahlverengung unmittelbar oberhalb und angrenzend dem Pfahlfuß vermieden.The pile root is advantageously formed by granular material present in the inner tube, which may also be mixed with a binder, and preferably is dry concrete, and ultimately can also serve as a closure means, as described below, by an inner ramming, wherein the process can be repeated by adding further batches of the granular material until the pile has been made to a desired length, whereby ultimately the length of the pile base can be varied or adjusted. Preferably, the pile root has an outer diameter which is the outer wall of the inner tube, and further preferably also overtops the outer wall of the drill pipe. By driving the inner tube into the pile base, a pile narrowing is preferably avoided immediately above and adjacent the pile base.

Das Bohren vorzugsweise bis in einen tragfähigen Baugrund mittels des Bohrrohrs erfolgt, wie bereits vorstehend erwähnt, vorteilhafter Weise unter Vorsehung mindestens eines Verschlussmittels in dem dem tragfähigen Baugrund zugewandten Endbereich des Bohrrohrs und/oder Innenrohrs. Als Verschlussmittel kann dabei beispielsweise eine Fußplatte, welche auch als verlorene, aber auch als wieder gewinnbare Fußplatte ausgebildet sein kann, vorgesehen sein. Alternativ kann auch eine Art Deckel vorgesehen sein, der z.B. im Querschnitt gesehen als ein auf dem Kopf stehendes Dreieck angesprochen werden kann. Ein alternatives Verschlussmittel ist die Vorsehung eines Pfropfens aus Kies und/oder Sand und/oder ein mindestens ein Bindemittel aufweisendes körniges Material, insbesondere von Beton, insbesondere trockener Beton, mittels welchem das Bohrrohr und/oder das Innenrohr verschlossen wird. Es könnten auch sowohl eine Fußplatte bzw. Deckel als auch ein Pfropfen aus körnigem Material etc. vorgesehen werden. Eine Fußplatte oder Deckel als Verschlußmittel sind vorzugsweise an dem dem Baugrund zugewandten Endbereich des Bohrrohrs angeordnet, insbesondere befestigt. Sie können zusätzlich auch am Endbereich des Innenrohrs, insbesondere an der endständigen Stirnfläche desselben, angeordnet sein. Die Fußplatte bzw. der Deckel sind derart am Endbereich des Bohrrohrs angeordnet, dass sie die Außenwandung des Bohrrohrs nicht überragen. Durch Rammung, vorzugsweise Innenrammung, durch das Innenrohr wird die Fußplatte oder der Deckel weggeschlagen, so als verlorene Fußplatte bzw. Deckel ausgebildet, bzw. geöffnet, um dann ein weiteres Abteufen des Innenrohrs und/oder die Ausbildung des Pfahlfußes zu ermöglichen.The drilling preferably takes place up to a load-bearing ground by means of the drill pipe, as already mentioned above, advantageously providing at least one closure means in the supporting ground facing end region of the drill pipe and / or inner tube. As a closure means may be provided, for example, a foot plate, which may also be designed as lost, but also recoverable as foot plate. Alternatively, a type of lid may also be provided, e.g. seen in cross section as an upside down triangle can be addressed. An alternative closure means is the provision of a plug of gravel and / or sand and / or a granular material having at least one binder, in particular concrete, in particular dry concrete, by means of which the drill pipe and / or the inner pipe is closed. It could also be both a foot plate or lid and a plug of granular material, etc. are provided. A foot plate or lid as closure means are preferably arranged on the ground facing the end region of the drill pipe, in particular fixed. In addition, they can also be arranged at the end region of the inner tube, in particular at the end face of the same. The foot plate or the cover are arranged at the end region of the drill pipe so that they do not project beyond the outer wall of the drill pipe. By ramming, preferably Innenrammung, through the inner tube, the foot plate or the lid is beaten off, so formed as a lost foot plate or lid, or opened, to allow then further sinking of the inner tube and / or the formation of the pile base.

Der Pfahlfuß wird alleinig durch das Innenrohr ausgebildet. Das Bohrrohr ist dafür da, möglichst emmissionsarm eine Bohrung in den Baugrund, bevorzugt bis in den tragfähigen Baugrund, einzubringen. Das Innenrohr bestimmt damit auch maßgeblich den Pfahldurchmesser, der in etwa dem Innendurchmesser des Innenrohrs entsprechen wird. Vorzugsweise weist der mit dem erfindungsgemäßen Verfahren hergestellte Pfahl über seine gesamte Länge einen in etwa dem Innendurchmesser des Innenrohrs aufweisenden Pfahldurchmesser auf. Es kann aber auch vorgesehen sein, dass z.B. das Innenrohr soweit aus dem Baugrund im Laufe der Einbringung von Material entfernt wird, bis dessen endständige Stirnfläche nicht mehr diejenige des Bohrrohrs überragt, so dass dann an dieser Stelle eine Pfahldurchmesseraufweitung erfolgen kann, insbesondere wenn das Innenrohr vollständig aus dem Baugrund entfernt wird, während das Bohrrohr in diesem verbleibt und Material dann über dieses eingefüllt wird zur Bildung des Pfahles.The pile base is formed solely by the inner tube. The drill pipe is there as low as possible to bring a hole in the ground, preferably down to the load-bearing ground. The inner tube thus also determines significantly the pile diameter, which will correspond approximately to the inner diameter of the inner tube. Preferably, the pile produced by the method according to the invention over its entire length has a pile diameter approximately at the inner diameter of the inner tube. However, it can also be provided that e.g. the inner tube is removed from the ground in the course of the introduction of material until its end face no longer dominates that of the drill pipe, so that then at this point a pile diameter expansion can take place, especially if the inner tube is completely removed from the ground, while the Drill tube remains in this and material is then poured over this to form the pile.

Durch das erfindungsgemäße Verfahren kann vorteilhafter Weise mit einer hohen Geschwindigkeit unter nur geringen Erschütterungen ein Pfahl hergestellt werden, welcher eine nahezu gleiche oder ähnliche Tragfähigkeit wie ein FRANKIPFAHL aufweist. Der große Vorteil gegenüber dem FRAN-KIPFAHL besteht darin, dass dieser aufgrund der Vollverdrängung durch Vortreiben des Rammrohres eine lange Rammzeit und hohe Erschütterungen aufweist. Im Vergleich zu bekannten Bohrpfählen wie dem VB-Pfahl oder dem SOB-Pfahl wird eine deutlich erhöhte Tragfähigkeit erzielbar. Die geringen Erschütterungen werden durch eine Tiefenrammung erzielt, denn der Rammbär arbeitet mittels Innenrammung im Bereich der Endteufe und/oder nicht zu Beginn des Abteufvorganges, auf jeden Fall unterhalb der Bodenoberfläche, von welcher aus abgeteuft wurde.By means of the method according to the invention, it is advantageously possible to produce a pile with a high speed with only slight vibrations, which has a virtually identical or similar load-bearing capacity as a FRANKIPFAHL. The big advantage over the FRAN KIPFAHL is that it is due to the full displacement by driving the ram tube has a long pile time and high vibrations. In comparison to known bored piles such as the VB pile or the SOB pile a significantly increased load capacity can be achieved. The low vibrations are achieved by a deep ramming, because the ram works by means of inner ramming in the area of the final depth and / or not at the beginning of the Abteufvorganges, in any case below the soil surface, from which was sunk.

Das Abteufen erfolgt durch Eindrehen des Bohrrohrs bis in einen insbesondere tragfähigen Baugrund. Dabei wird vorteilhafter Weise zusammen mit dem Bohrrohr das Innenrohr bis in den Baugrund eingebracht. Besonders bevorzugt wird dabei das Innenrohr bei Einbringung gedreht. Weiter bevorzugt erfolgt die Drehung während der Bohrbewegung des Bohrrohrs. Vorteilhafter Weise wird eine Steuerung derart vorgesehen, dass die Drehbewegung des Bohrrohrs und des Innenrohrs miteinander synchronisiert werden. Bevorzugt besitzt das Innenrohr während des Bohrvorgangs beim Abteufen keinerlei Antrieb, der ein Drehmoment erzeugt, dass dann über das Innenrohr in den anstehenden Boden übertragen wird. Umgekehrt kann das Innenrohr bei Entfernung aus dem Baugrund mit einem Antrieb versehen sein. Eine Mitnahme des Innenrohrs (drehend, gleitend, schiebend, vibrierend usw.) beim Abteufen erfolgt vorzugsweise durch die Bewegung des Bohrrohres. Alternativ kann auch vorgesehen sein, dass über das oder die Dichtmittel das Innenrohr fest vom Bohrrohr gehalten ist, und sich bei Einstellung eines Überstandes vor Abteufen dann ohne die Notwendigkeit einer zusätzlichen Steuerung aufgrund der Mitnahme über das oder die Dichtmittel das Innenrohr drehend zusammen mit dem Bohrrohr bis in den Baugrund bewegt.The drilling is done by screwing the drill pipe into a particularly sustainable subsoil. It is advantageously introduced together with the drill pipe, the inner tube to the ground. Particularly preferably, the inner tube is rotated during insertion. More preferably, the rotation takes place during the drilling movement of the drill pipe. Advantageously, a control is provided such that the rotational movement of the drill pipe and the inner tube are synchronized with each other. During the drilling operation, the inner tube preferably does not have any drive during drilling, which generates a torque that is then transmitted via the inner tube into the upcoming floor. Conversely, the inner tube may be provided on removal from the ground with a drive. An entrainment of the inner tube (rotating, sliding, sliding, vibrating, etc.) during drilling is preferably carried out by the movement of the drill pipe. Alternatively, it can also be provided that the inner tube is firmly held by the drill pipe via the sealant or the inner tube rotating with the drill pipe when adjusting a projection before sinking then without the need for additional control due to the entrainment over the or the sealant moved into the ground.

Vorteilhafter Weise werden durch das Innenrohr Spülhilfen eingebracht, beispielsweise Bentonit-Suspensionen, Wasser oder ähnliches. Mittels der Spülhilfen, welche über eine obere Öffnung des Innenrohrs und/oder Bohrrohrs beispielsweise mittels Schläuchen in dieses eingeleitet werden, und über in der Wandung des Innenrohrs vorgesehene Öffnungen austreten können, kann das Abteufen beschleunigt und auch das Pfahltragverhalten verbessert werden. Soweit das als Spülhilfe eingesetzte Material auch ein Bindemittel enthält, kann zudem umgebend der Boden verfestigt werden. Die Spülhilfen können sowohl während des Abteufens, als auch bei und nach Erreichung der Endteufe und der nachfolgenden Entfernung des Bohrrohrs und des Innenrohrs aus dem Baugrund eingesetzt werden.Advantageously, flushing aids are introduced through the inner tube, for example bentonite suspensions, water or the like. By means of the flushing aids, which are introduced via an upper opening of the inner tube and / or drill pipe, for example by means of hoses in this, and can emerge provided in the wall of the inner tube openings, the Abteufen can be accelerated and also the pile performance can be improved. As far as the material used as a rinse aid also contains a binder, also the surrounding soil can be solidified. The rinsing aids can be used both during drilling, as well as during and after reaching the final depth and the subsequent removal of the drill pipe and the inner tube from the ground.

Es kann alternativ zu einer Drehung sowohl des Bohrrohrs als auch des Innenrohrs bei Abteufen vorgesehen sein, dass nur das Bohrrohr gedreht wird, und das Innenrohr festgehalten und innerhalb des Bohrrohrs bei Fortschritt des Abteufens nachgeführt wird. Das Innenrohr kann hierfür an einem Mäkler, welcher auch das Bohrrohr führt, oberhalb des Bohrrohrs an diesem befestigt sein. Beispielsweise kann dabei derart vorgegangen werden, dass das Bohrrohr mit einem Verschlussmittel versehen ist, und das Innenrohr in seinem unteren Endbereich über ein Dichtmittel zwischen Außenwandung des Innenrohrs und Innenwandung des Bohrrohrs angeordnet ist, das Dichtmittel jedoch die Drehbewegung des Bohrrohrs nicht auf das Innenrohr überträgt, da nicht hinreichend fest an diesem angeordnet. Es kann zum Beispiel auch das Innenrohr oberhalb des mindestens einen Dichtmittels dem Bohrrohr beim Abteufen mit- bzw. nachgeführt werden, und erst bei Erreichen der Endteufe zur Erzielung des Überstands im Verhältnis zum Bohrrohr in Richtung des tragfähigen Bodens bewegt werden, sodass dann nachfolgend das mindestens eine Dichtmittel zur Anlage an der Außenwandung des Innenrohrs gelangt. Das Innenrohr und/oder das Bohrrohr können im Übrigen an deren Außenwandung angeordnet auch Abstands- und Führungsmittel aufweisen, welche eine Führung des Innenrohrs im Bohrrohr erleichtern.As an alternative to rotation of both the drill pipe and the inner pipe during drilling, it may be provided that only the drill pipe is rotated and the inner pipe is retained and tracked within the drill pipe as the drilling progresses. For this purpose, the inner tube can be attached to a leader, which also guides the drill pipe, above the drill pipe. For example, it is possible to proceed in such a way that the drill pipe is provided with a closure means, and the inner pipe is arranged in its lower end region via a sealing means between outer wall of the inner pipe and inner wall of the drill pipe, but the sealant does not transmit the rotary movement of the drill pipe to the inner pipe, because not sufficiently firmly arranged on this. It can, for example, the inner tube above the at least one sealant the drill pipe when drilling or tracked, and only when reaching the Endteufe to achieve the supernatant in relation to the drill pipe in the direction of the load-bearing soil are moved, so then then the at least a sealant comes to rest on the outer wall of the inner tube. Incidentally, the inner tube and / or the drill pipe can also have spacing and guide means, which facilitate guide of the inner tube in the drill pipe, arranged on its outer wall.

Der Pfahlfuß kann gemäß dem erfindungsgemäßen Verfahren hergestellt werden, ohne dass ein solcher Überstand zwischen der endseitigen Stirnfläche des Innenrohrs und der endseitigen Stirnfläche des Bohrrohrs vorgesehen ist, kann jedoch auch erzeugt werden, wenn ein Überstand des Innenrohrs gegeben ist. Nachfolgend der Ausbildung des Pfahlfußes durch vorzugsweise Ausstampfen wird dann entweder der Überstand zwischen endseitiger Stirnfläche des Innenrohrs und endseitiger Stirnfläche des Bohrrohrs vergrößert oder beibehalten und das Innenrohr in den Pfahlfuß eingeführt, gegebenenfalls auch unter Mitverschiebung des Bohrrohrs, oder aber es wird durch Herstellung des Überstands das Innenrohr in den Pfahlfuß geführt. Die Einführung des Innenrohrs in den Pfahlfuß kann drehend oder durch eine longitudinale Schiebe-Bewegung des Innenrohrs, beispielsweise durch Rammung, in Richtung des Pfahlfußes erfolgen. In einer weiter bevorzugten Ausführungsform der vorliegenden Erfindung kann außer dem Innenrohr auch das Bohrrohr verschoben werden, und zwar bevorzugt bis in den Pfahlfuß, bevorzugt durch eine drehende Bewegung. Die Einführung des Innenrohrs in den Pfahlfuß erfolgt vorteilhafter Weise mindestens so weit, bis die endseitige Stirnfläche des Bohrrohrs auf der Oberfläche des Pfahlfußes aufliegt.The pile base can be produced according to the method of the invention without such a projection being provided between the end-side end face of the inner tube and the end-side end face of the drill pipe, but can also be produced if a projection of the inner tube is provided. Following the formation of the pile base by preferably stamping either the supernatant between end-side end face of the inner tube and end-side end face of the drill pipe is enlarged or maintained and introduced the inner tube in the pile base, possibly with Mitverschiebung the drill pipe, or it is by producing the supernatant the Inner tube led into the pile foot. The introduction of the inner tube in the pile base can be done in rotation or by a longitudinal sliding movement of the inner tube, for example by ramming, in the direction of the pile base. In a further preferred embodiment of the present invention, in addition to the inner tube and the drill pipe can be moved, preferably to the pile base, preferably by a rotating movement. The introduction of the inner tube in the pile base is advantageously carried out at least until the end face of the drill pipe rests on the surface of the pile base.

Die Entfernung des Bohrrohrs und des Innenrohrs aus dem Baugrund kann auf verschiedene Weise erfolgen. Bevorzugt erfolgt die Entfernung durch Ziehen und/oder Drehen des Bohrrohrs und/oder Innenrohrs. Vorteilhafterweise wird das Innenrohr zusammen mit dem Bohrrohr aus dem Baugrund entfernt, insbesondere gezogen. Es kann jedoch auch vorgesehen sein, dass das Innenrohr zunächst im Boden verbleibt, während das Bohrrohr durch Ziehen oder Drehung aus dem Baugrund entfernt wird. Und schließlich kann auch vorgesehen sein, dass zunächst das Innenrohr entfernt ist, während das Bohrrohr im Boden verbleibt. Vorteilhafter Weise erfolgt die Entfernung des Innenrohrs und/oder Bohrrohrs während des Einfüllens des mindestens ein Bindemittel aufweisenden körnigen Materials, vorzugsweise Betons. Das Material, insbesondere flüssiger Beton, wird dabei bis in den Pfahlfuß eingebracht, und bildet den Pfahl aus.The removal of the drill pipe and the inner pipe from the ground can be done in various ways. Preferably, the removal is carried out by pulling and / or rotating the drill pipe and / or inner tube. Advantageously, the inner tube is removed together with the drill pipe from the ground, in particular pulled. However, it can also be provided that the inner tube initially remains in the ground, while the drill pipe is removed by pulling or turning out of the ground. And finally, it can also be provided that the inner tube is first removed while the drill pipe remains in the ground. Advantageously, the removal of the inner tube and / or drill pipe during the filling of the at least one binder having granular material, preferably concrete. The material, in particular liquid concrete, is thereby introduced into the pile base, and forms the pile.

Vorteilhafter Weise wird während oder vor dem Einfüllen des mindestens ein Bindemittel aufweisenden körnigen Materials ein Bewehrungskorb in das Innenrohr bzw. das Bohrrohr eingestellt. Der Bewehrungskorb wird vorteilhafter Weise vor Beginn des Einfüllens des mindestens ein Bindemittel aufweisenden körnigen Materials, vorzugsweise Betons, in das Innenrohr bzw. das Bohrrohr eingestellt.Advantageously, a reinforcement cage is set in the inner tube or the drill pipe during or before the filling of the granular material having at least one binder. The reinforcing cage is advantageously set in the inner tube or the drill pipe prior to the beginning of the filling of the granular material, preferably concrete, having at least one binder.

Die Entfernung des Bohrrohrs und des Innenrohrs kann dabei derart erfolgen, dass der Überstand des Innenrohrs bei der Entfernung bestehen bleibt. Jedoch kann der Überstand beispielsweise auch während der Entfernung durch eine zusätzliche Bewegung des Innenrohrs im Verhältnis zum Bohrrohr, soweit beide zusammen aus dem Baugrund entfernt werden, in Richtung auf eine Bodenoberfläche hin reduziert werden bzw. auf Null zurück geführt werden, so dass eine endseitige Stirnfläche des Innenrohrs zumindest auf gleicher Ebene wie eine endseitige Stirnfläche des Bohrrohrs zu liegen kommt oder aber sogar mit einem Rücksprung innerhalb des Bohrrohrs angeordnet ist. Das Bohrrohr kann durch Ziehen oder aber auch durch Drehen aus dem Baugrund entfernt werden, ebenso das Innenrohr. Die vorstehend angegebenen verschiedenen Möglichkeiten der Entfernung des Bohrrohrs und des Innenrohrs ermöglichen es, unterschiedliche Pfahldurchmesser zu verwirklichen.The removal of the drill pipe and the inner tube can be carried out such that the supernatant of the inner tube remains in the removal. However, the supernatant, for example, during the removal by an additional movement of the inner tube relative to the drill pipe, as far as they are removed together from the ground, can be reduced towards a bottom surface or returned to zero, so that an end-side end face the inner tube comes to lie at least on the same level as an end-side end face of the drill pipe or even arranged with a recess within the drill pipe. The drill pipe can be removed by pulling or by turning from the ground, as well as the inner tube. The above-mentioned various possibilities of removing the drill pipe and the inner pipe make it possible to realize different pile diameters.

Durch das erfindungsgemäße Verfahren werden Pfähle zur Verfügung gestellt, welche keine Schwächung oberhalb des Pfahlfußes aufweisen. Zudem können in Abhängigkeit von den Baugrundverhältnissen unterschiedliche Schaftdurchmesser, beispielsweise ein größerer im oberflächennahen Bereich und ein geringerer im Bereich oberhalb des Pfahlfußes, erzeugt werden, um den Energie- und Materialeintrag wirtschaftlich zu gestalten. Auch eine Kiesvorverdichtung ist mit dem erfindungsgemäßen Verfahren möglich.By the method according to the invention piles are provided which have no weakening above the pile base. In addition, depending on the subsoil conditions different shank diameters, for example, a larger near-surface and a lesser in the area above the pile base, are generated to make the energy and material entry economically. Gravel precompression is also possible with the method according to the invention.

Im Übrigen kann erfindungsgemäß das Innenrohr in seinem unteren Endbereich, der dem Baugrund zugewandt ist, eine Aufweitung aufweisen. Diese Aufweitung kann zugleich als Führungsmittel des Innenrohrs im Bohrrohr dienen. Insbesondere wenn vor Abteufen sogleich ein Überstand zwischen Innenrohr und Bohrrohr vorgesehen ist, kann die Aufweitung des Innenrohrs auch gleich dem Außendurchmesser des Bohrrohrs sein, oder aber diesen überragen. Durch die Aufweitung kann bei Einfüll ung von mindestens ein Bindemittel aufweisendem körnigen Material in das Innenrohr bei Entfernung desselben aus dem tragfähigen und nicht tragfähigen Baugrund, gleich ob durch Drehen oder Ziehen, ein verbreiterter Pfahldurchmesser erzielt werden. Zudem wird die Anbindung des Pfahls an den Pfahlfuß hierdurch verbessert. Vorteilhafter Weise wird bei einer derartigen Ausbildung das Bohrrohr zuerst ziehend oder drehend, bevorzugt ziehend, aus dem Baugrund entfernt, und nachfolgend das Innenrohr.Incidentally, according to the invention, the inner tube in its lower end region, which faces the ground, have a widening. This expansion can also serve as a guide means of the inner tube in the drill pipe. In particular, if a projection between inner tube and drill pipe is immediately provided before Abteufen, the expansion of the inner tube may also be equal to the outer diameter of the drill pipe, or project beyond this. Due to the expansion can be achieved when filling at least one binder-containing granular material in the inner tube at the same distance from the viable and unsustainable ground, whether by turning or pulling, a broadened pile diameter. In addition, the connection of the pile to the pile base is thereby improved. Advantageously, in such a design, the drill pipe is first pulling or rotating, preferably pulling, removed from the ground, and subsequently the inner tube.

Es kann grundsätzlich im Sinne der vorliegenden Erfindung bei der Entfernung des Bohrrohrs und des Innenrohrs aus dem Baugrund vorgesehen sein, dass während der Entfernung des Bohrrohrs aus dem Baugrund zeitversetzt, jedoch in Teilbereichen zeitgleich, die Entfernung des Innenrohrs aus dem Baugrund erfolgt, und umgekehrt.It may in principle be provided in the context of the present invention in the removal of the drill pipe and the inner tube from the ground that during the removal of the drill pipe from the ground delayed, but in some areas at the same time, the removal of the inner tube from the ground, and vice versa.

Das erfindungsgemäße Verfahren kann mit einer Vorrichtung zur Herstellung eines gebohrten Pfahls mit einem Pfahlfuß, umfassend ein Bohrrohr und ein in diesem angeordnetes Innenrohr, wobei zwischen einer Außenwandung des Innenrohrs und einer Innenwandung des Bohrrohrs mindestens ein Dichtmittel zur Verhinderung des Eindringens von insbesondere nicht-tragfähigem und/oder tragfähigem Baugrund angeordnet ist, durchgeführt werden. Die erfindungsgemäße Vorrichtung weist weiter vorteilhaft einen Überstand zwischen einer endseitigen Stirnfläche des Innenrohrs und einer endseitigen Stirnfläche des Bohrrohrs auf, so dass das Innenrohr über das Bohrrohr, zugewandt dem Baugrund, übersteht. Das Dichtmittel kann wie bereits vorstehend im Zusammenhang mit dem erfindungsgemäßen Verfahren dargestellt ausgebildet sein. Das Innenrohr ist vorteilhafter Weise über eine Haltevorrichtung, bevorzugt einen Mäkler, oberhalb des Oberrands des Bohrrohrs befestigt. Das Bohrrohr kann bei der erfindungsgemäßen Vorrichtung derart ausgebildet sein, wie im Zusammenhang mit dem erfindungsgemäßen Verfahren dargestellt, und insbesondere mindestens eine Schneidwendel aufweisen. Auch können Verschlussmittel vorgesehen sein, beispielsweise in Form von verlorengehenden oder nicht verlorengehenden Fußplatten, die am Bohrrohr befestigt sind, oder aber als Pfropfen, wie ebenfalls im Zusammenhang mit dem erfindungsgemäßen Verfahren beschrieben.The method according to the invention can be provided with a device for producing a drilled pile with a pile base, comprising a drill pipe and an inner pipe arranged therein, wherein at least between an outer wall of the inner pipe and an inner wall of the drill pipe a sealing means is arranged to prevent the penetration of in particular non-load-bearing and / or load-bearing ground. The device according to the invention further advantageously has a projection between an end-side end face of the inner tube and an end-side end face of the drill pipe, so that the inner pipe protrudes beyond the drill pipe facing the ground. The sealing means may be formed as already described above in connection with the method according to the invention. The inner tube is advantageously attached via a holding device, preferably a leader, above the upper edge of the drill pipe. The drill pipe can be formed in the device according to the invention as shown in connection with the method according to the invention, and in particular have at least one cutting helix. Closure means may also be provided, for example in the form of lost or not lost footplates which are fastened to the drill pipe, or as grafts, as also described in connection with the method according to the invention.

Diese und weitere Vorteile der vorliegenden Erfindung werden anhand der nachfolgenden Fig. 1A, 1 B/C und 1D/E näher erläutert, welche fünf Verfahrenszustände A, B, C, D und E zeigt.These and other advantages of the present invention will become apparent from the following Fig. 1A . 1 B / C and 1D / E explains in more detail which shows five process states A, B, C, D and E.

Zunächst wird darauf hingewiesen, dass die in den Figuren dargestellte Ausgestaltung des erfindungsgemäßen Verfahrens und der erfindungsgemäßen Vorrichtung nicht beschränkend auszulegen ist. Vielmehr können die dort beschriebenen Merkmale untereinander und mit den oben beschriebenen Merkmalen zu weiteren Ausgestaltungen kombiniert werden. Des Weiteren sei darauf hingewiesen, dass die in der Figurenbeschreibung angegebenen Bezugszeichen den Schutzbereich der vorliegenden Erfindung nicht beschränken, sondern lediglich auf die in den Figuren gezeigten Ausführungsbeispiele verweisen sollen. Gleiche Teile oder Teile mit gleicher Funktion weisen im Folgenden die gleichen Bezugszeichen auf. Es sei insbesondere darauf hingewiesen, dass das in den Figuren gezeigte erfindungsgemäße Verfahren mit einer Innenrammung nur eine mögliche Ausgestaltung darstellt, und dass auch die gemeinsame Abteufung und Entfernung eines Bohrrohrs mit einem Innenrohr, wie in dem Ausführungsbeispiel gezeigt, nur eine der möglichen Ausgestaltungen der vorliegenden Erfindung ist.It should first be pointed out that the embodiment of the method according to the invention and the device according to the invention shown in the figures is not intended to be restrictive. Rather, the features described therein can be combined with each other and with the features described above to further embodiments. Furthermore, it should be noted that the reference numerals indicated in the description of the figures do not limit the scope of the present invention, but merely refer to the embodiments shown in the figures. Identical parts or parts with the same function have the same reference numerals below. It should be noted in particular that the inventive method shown with an inner ridge represents only one possible embodiment, and that the joint removal and removal of a drill pipe with an inner tube, as shown in the embodiment, only one of the possible embodiments of the present Invention is.

Fig. 1A zeigt nun in Abschnitt A eine erfindungsgemäße Vorrichtung 10, bei welcher ein Innenrohr 14 in einem Bohrrohr 12 angeordnet ist. Bohrrohr 12 und Innenrohr 14 sind an einem Mäkler 20 befestigt. Im Innenrohr 14 ist ein Rammbär 22, gehalten über ein Seil 24 an dem Mäkler 20 über eine hier nicht gezeigte Winde gehalten, und liegt auf einem Verschlussmittel 28, ausgebildet als ein beispielsweise aus Kies oder trockenem Beton gebildeter Pfropfen, auf. Das Bohrrohr 12 weist eine Außenwandung 13 auf, an welcher eine Schneidwendel 18, welche ausgehend von einer endseitigen Stirnfläche 52 an der Außenwandung 13 bis in den oberen Bereich unterhalb der Befestigung des Bohrrohrs 12 am Mäkler 20 angeordnet ist, angeordnet ist. Das Verschlussmittel 28 ist im unteren Endbereich des Bohrrohrs 12 angeordnet, und kann alternativ oder zusätzlich als Platte oder Deckel ausgebildet sein. Fig. 1A now shows in Section A an inventive device 10, in which an inner tube 14 is disposed in a drill pipe 12. Drill pipe 12 and inner tube 14 are attached to a leader 20. In the inner tube 14, a ram 22, held by a cable 24 on the leader 20 is held by a winch, not shown here, and rests on a closure means 28 formed as a plug formed, for example, from gravel or dry concrete. The drill pipe 12 has an outer wall 13, on which a cutting helix 18, which is arranged starting from an end-side end face 52 on the outer wall 13 to the upper region below the attachment of the drill pipe 12 at the broker 20, is arranged. The closure means 28 is in the lower End region of the drill pipe 12 is arranged, and may alternatively or additionally be formed as a plate or lid.

Die Vorrichtung 10 steht auf einer Bodenoberfläche 60 auf. Unterhalb der Bodenoberfläche 60 befindet sich ein Grundwasserspiegel 30 innerhalb eines nicht-tragfähigen Baugrunds 32, unterhalb des nicht-tragfähigen Baugrunds 32 befindet sich tragfähiger Baugrund 34.The device 10 rests on a bottom surface 60. Below the ground surface 60 is a groundwater level 30 within a non-load-bearing ground 32, below the unsustainable ground 32 is a sustainable ground 34.

In Fig. 1 B/C wird in Abschnitt B das Bohrrohr 12 drehend in den Baugrund 32 bzw. 34 abgeteuft, wobei die Drehbewegung durch die Pfeile 36.1 und 36.2 verdeutlicht ist. Das Innenrohr 14 wird dabei antriebsfrei von dem Bohrrohr 12 mitgenommen, und ist im Übrigen über ein zwischen einer Außenwandung 17 des Innenrohrs 14 und einer Innenwandung 11 des Bohrrohrs 12 angeordnetes Dichtmittel 16, bevorzugt in Form eines Ringes, vor Eindringen von Baugrund 32, 34 in den Bereich zwischen Außenwandung 17 des Innenrohrs 14 und Innenwandung 11 des Bohrrohrs 12 geschützt.In Fig. 1 B / C is drilled in section B, the drill pipe 12 rotating in the ground 32 and 34, wherein the rotational movement is illustrated by the arrows 36.1 and 36.2. The inner tube 14 is thereby driven drive-free of the drill pipe 12, and is moreover via a arranged between an outer wall 17 of the inner tube 14 and an inner wall 11 of the drill pipe 12 sealant 16, preferably in the form of a ring, against ingress of ground 32, 34 in the area between outer wall 17 of the inner tube 14 and inner wall 11 of the drill pipe 12 is protected.

Der Rammbär 22 liegt weiterhin auf dem Pfropfen 28 auf. Bei Erreichung einer Endteufe im tragfähigen Baugrund 34 wird in Richtung von Pfeilen 38 über den Rammbären 22 in Form einer Tiefenrammung ein Pfahlfuß 46 ausgetrieben, der in Abschnitt C der Fig. 1 B/C gezeigt ist. Sollte als Verschlußmittel 28 eine Platte oder Deckel alternativ oder zusätzlich vorgesehen sein, würde diese(r) durch die Rammung weggeschlagen. Um den Pfahlfuß 46 herum hat sich bei Abteufung des Bohrrohrs mit dem Innenrohr ein verdichteter Bodenbereich 56 gebildet (siehe Abschnitt D, Fig. 1 D/E).The ram 22 continues to rest on the plug 28. Upon reaching a final depth in the viable ground 34, a pile base 46 is driven in the direction of arrows 38 on the Rammbären 22 in the form of a Tiefenrammung, in Section C of Fig. 1 B / C is shown. Should a plate or lid alternatively or additionally be provided as closure means 28, this would be beaten away by the ram. A compacted bottom area 56 has formed around the pile base 46 when the drill pipe is covered with the inner pipe (see section D, FIG. Fig. 1 D / E).

Für die Herstellung des Pfahlfußes kann auch z.B. trockener Beton in das Innenrohr 14 eingefüllt werden, auch mehrmals, welcher dann mit dem Material des Pfropfens 28, so vorhanden, ausgestampft wird und den Pfahlfuß 46 bildet.Nachdem der Pfahlfuß 46 ausgestampft ist, wird das Innenrohr 14 in den Pfahlfuß 46 vorgetrieben, bis sich ein Überstand 26 zwischen einer endständigen Stirnfläche 54 des Innenrohrs 14 und einer endseitigen Stirnfläche 52 des Bohrrohrs 12 ausbildet, welcher beispielsweise 100 cm beträgt. Anschließend wird der Rammbär 22 aus dem Innenrohr 14 entfernt, und als mindestens ein Bindemittel aufweisendes körniges Material, beispielsweise insbesondere flüssiger Beton 44, symbolisiert durch den Pfeil, in das Innenrohr und/oder Bohrrohr 12, 14 bis in den Pfahlfuß 46 eingefüllt. Dabei kann ein Bewehrungskorb 42, wie in Abschnitt D der Fig. 1 D/E gezeigt, vor Einfüllung des Betons 44, jedoch auch gleichzeitig oder während der Einfüllung des Betons 44 im Bohrrohr 12 oder Innenrohr 14 eingestellt werden.Dry concrete can also be filled into the inner tube 14 for the production of the pile base, for example, several times, which is then stamped with the material of the plug 28, if present, and forms the pile base 46. After the pile base 46 has been stamped out, the inner tube becomes 14 in the pile base 46 advanced until a projection 26 between a terminal end face 54 of the inner tube 14 and an end face 52 of the drill pipe 12 is formed, which is for example 100 cm. Subsequently, the Rammbär 22 is removed from the inner tube 14, and as at least one binder exhibiting granular material, for example, in particular liquid concrete 44, symbolized by the arrow, in the inner tube and / or drill pipe 12, 14 filled into the pile base 46. In this case, a reinforcement cage 42, as in section D of Fig. 1 D / E shown before filling the concrete 44, but also at the same time or during the filling of the concrete 44 in the drill pipe 12 or inner tube 14 are set.

Während des Einfüllens des Betons wird das Bohrrohr 12 durch Ziehen in Richtung eines Pfeils 40 aus dem Baugrund 32, 34 zusammen mit dem Innenrohr 14 entfernt, wie in Abschnitt D der Fig. 1 D/E gezeigt, so dass sich ein Pfahl 50, wie in Abschnitt E der Fig. 1 D/E gezeigt, ausbildet. Dieser weist einen Pfahlfuß 46 auf, welcher ohne jegliche Schwächung oberhalb des Pfahlfußes 46 in einen Pfahlschaft 51 übergeht.During the filling of the concrete, the drill pipe 12 is removed by pulling in the direction of an arrow 40 from the ground 32, 34 together with the inner tube 14, as in section D of Fig. 1 D / E shown, so that a stake 50, as described in section E of Fig. 1 D / E shown, trains. This has a pile base 46, which passes without any weakening above the pile base 46 in a pile shaft 51.

Claims (14)

  1. A method for producing a pile (50), wherein a drill pipe (12) having at least one cutting helix (18) disposed in a subsection of an outer wall (13) thereof, is drilled into a subsoil (34), a pile foot (46) is formed by means of an inner pipe (14) that can be disposed in the drill pipe (12), at least an end region (15) of the inner pipe (14) is inserted into the pile foot (46), a granular material having at least one binder is poured in via the inner pipe (14), and the drill pipe (12) and the inner pipe (14) are removed from the subsoil (32, 34), wherein the pile foot (46) is formed by internal driving and wherein the inner pipe (14) protrudes over an end side front face (52) of the drill pipe (12) with its end side front face (52) facing the subsoil (34) and the inner pipe (14) is drilled into the pile foot (46).
  2. The method according to Claim 1, characterized in that the removal occurs by means of pulling and/or turning (40) of the drill pipe (12) and/or the inner pipe (14).
  3. The method according to one of the preceding claims, characterized in that an outer wall (17) of the inner pipe (14) is sealed against an inner wall (11) of the drill pipe (12) with at least one sealing means (16).
  4. The method according to one of the preceding claims, characterized in that for the internal driving a pile driver (22) is inserted in the inner pipe (14).
  5. The method according to one of the preceding claims, characterized in that the drill pipe (12) has at least one closure means (28) at its end region (48) facing the load bearing subsoil (34).
  6. The method according to one of the preceding claims, characterized in that the inner pipe (14) and the drill pipe (12) are inserted into the pile foot (46).
  7. The method according to one of the preceding claims, characterized in that the drill pipe (12) and/or the inner pipe (14) are provided with a plug (28) made of gravel and/or sand and/or a granular material having at least one binder.
  8. The method according to claim 7, characterized in that the pile driver (22) is placed on the plug (28).
  9. The method according to one of the preceding claims, characterized in that the inner pipe (14), together with the drill pipe (12), is removed from the subsoil (32, 34).
  10. The method according to one of the preceding claims, characterized in that the removal of the inner pipe (14) and/or the drill pipe (12) occurs during the pouring of the granular material (44) having at least one binder.
  11. The method according to one of the preceding claims, characterized in that the inner pipe (14) is inserted into the load bearing subsoil (34) together with the drill pipe (12).
  12. The method according to one of the preceding claims, characterized in that the inner pipe (14) is turned during the insertion.
  13. The method according to Claim 12, characterized in that the turning occurs during the drilling movement of the drill pipe (12).
  14. The method according to one of the preceding claims, characterized in that rinsing agents are introduced through the inner pipe (14).
EP13802241.3A 2012-11-28 2013-11-27 Method for manufacturing a pile Active EP2925934B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL13802241T PL2925934T3 (en) 2012-11-28 2013-11-27 Method for manufacturing a pile

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102012023185.7A DE102012023185A1 (en) 2012-11-28 2012-11-28 Method for producing a pile
PCT/EP2013/003586 WO2014082741A1 (en) 2012-11-28 2013-11-27 Method for manufacturing a pile

Publications (2)

Publication Number Publication Date
EP2925934A1 EP2925934A1 (en) 2015-10-07
EP2925934B1 true EP2925934B1 (en) 2016-10-19

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US (1) US20150299976A1 (en)
EP (1) EP2925934B1 (en)
AU (1) AU2013351554B2 (en)
DE (1) DE102012023185A1 (en)
DK (1) DK2925934T3 (en)
PL (1) PL2925934T3 (en)
WO (1) WO2014082741A1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3351687B1 (en) 2017-01-24 2019-04-03 Franki Grundbau GmbH & Co. KG Method of making a pile
CN110230314B (en) * 2019-04-28 2024-04-26 广东工业大学 Pile foundation structure and construction method thereof
CN113668512B (en) * 2021-08-24 2022-09-02 中铁广州工程局集团深圳工程有限公司 Construction method of adjacent subway full casing full slewing drilling machine pile foundation
CN113700000B (en) * 2021-08-26 2022-10-11 中建八局第二建设有限公司 Supporting construction of binary geology hitching leg stake

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB402799A (en) * 1932-05-09 1933-12-11 Marcel Gallai Hatchard Improvements relating to piling foundations
GB477190A (en) * 1937-01-04 1937-12-23 Handelmij J De Wit & Zonen N V Method and apparatus for forming concrete foundation piles in situ
CH373326A (en) * 1959-07-09 1963-11-15 Dicht Ag Method and device for the manufacture of concrete cast-in posts
FR2318275A1 (en) * 1975-07-17 1977-02-11 Labrue Jean Marie PROCESS FOR MAKING PILES MOLDED IN THE SOIL AND HOLLOW AUGER FOR IMPLEMENTING THE PROCESS
DE3324509A1 (en) * 1983-07-07 1985-01-17 Frankipfahl Baugesellschaft mbH, 4000 Düsseldorf Method of producing bored piles having improved bearing capacity
FR2642777B1 (en) * 1989-02-09 1991-05-24 Sif Entreprise Bachy DEVICE FOR EXECUTING HOLLOW MOLDS IN THE GROUND
NL193948C (en) * 1992-05-18 2001-03-02 Hollandsche Betongroep Nv Method for manufacturing a concrete pile in the ground with a widened lower part.
NL9202008A (en) * 1992-11-18 1994-06-16 Beton Son Bv Method for applying a foundation pile to the ground in a vibration-free manner, as well as a device for applying the method.
DE19935813A1 (en) * 1999-07-29 2001-02-01 Schorr Claus Peter Device for fabrication of in-situ concrete piles consists of endless drilling screw with core tube containing separately controlled inner tube
US7226246B2 (en) * 2000-06-15 2007-06-05 Geotechnical Reinforcement, Inc. Apparatus and method for building support piers from one or successive lifts formed in a soil matrix
CN100478525C (en) * 2004-11-12 2009-04-15 丁锦良 Composite pile foundation construction method
DE102006023799B4 (en) * 2006-05-20 2014-05-15 Franki Grundbau Gmbh & Co.Kg Device for producing foundation elements
DE102006050307A1 (en) * 2006-10-23 2008-04-30 Lutz Stolze Method and device for introducing profiles into the soil

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US20150299976A1 (en) 2015-10-22
WO2014082741A1 (en) 2014-06-05
AU2013351554B2 (en) 2018-02-08
DE102012023185A1 (en) 2014-05-28
EP2925934A1 (en) 2015-10-07
AU2013351554A1 (en) 2015-07-16
PL2925934T3 (en) 2017-05-31
DK2925934T3 (en) 2017-02-06

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