EP2246482B1 - Procédé et dispositif d'établissement d'un élément de fondation à friction partiellement réduite - Google Patents

Procédé et dispositif d'établissement d'un élément de fondation à friction partiellement réduite Download PDF

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Publication number
EP2246482B1
EP2246482B1 EP20100004290 EP10004290A EP2246482B1 EP 2246482 B1 EP2246482 B1 EP 2246482B1 EP 20100004290 EP20100004290 EP 20100004290 EP 10004290 A EP10004290 A EP 10004290A EP 2246482 B1 EP2246482 B1 EP 2246482B1
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EP
European Patent Office
Prior art keywords
drill
pile
pipe section
annulus
friction
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
EP20100004290
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German (de)
English (en)
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EP2246482A1 (fr
Inventor
Erich Geier
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.)
Bauer Spezialtiefbau GmbH
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Bauer Spezialtiefbau GmbH
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Priority to EP20100004290 priority Critical patent/EP2246482B1/fr
Publication of EP2246482A1 publication Critical patent/EP2246482A1/fr
Application granted granted Critical
Publication of EP2246482B1 publication Critical patent/EP2246482B1/fr
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Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/22—Piles
    • E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
    • 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

Definitions

  • the invention relates to a method for producing a region-wise low-friction foundation element according to claim 1 and to an apparatus for creating a region-wise low-friction foundation element according to claim 9.
  • piles in particular concrete piles
  • Such piles transferred usually originate from the building forces on the one hand on the peak pressure at the footprint of the pile and on the other hand on the skin friction along the pile, that is on the pile shaft, in the surrounding soil from.
  • a method for creating a region as low-friction Gloisdungselements entspredend the preamble of claim 1 is made DE 100 23 467 C1 known.
  • the object of the invention is to provide a method and a device with which a particularly safe and reliable jacket friction reduction can be achieved with very little technical effort.
  • a pile in the soil is at least partially over-drilled with an annular space drill, and the annulus cleared when the pile is over-drilled is filled with a friction-reducing medium.
  • a basic idea of the invention can be seen in providing an additional tool, namely the annular space drill, for reducing jacket friction.
  • the cleared annulus is filled with a friction-reducing medium, which on the one hand supports the annulus against the surrounding soil material, but on the other hand, such a low resistance to shear that no significant Mantetreibungs originally be transmitted through the annulus.
  • the friction-reducing medium can be understood in particular to mean a medium which transmits the skin friction and / or a shear less well than the soil material itself cleared away in the annular space.
  • the invention makes it possible to perform the jacket friction reduction with a time interval for the preparation of the pile, in particular at a time when the concrete of the pile is at least partially or completely cured.
  • a time interval for the preparation of the pile in particular at a time when the concrete of the pile is at least partially or completely cured.
  • the drilling depth of the annular space drill and thus the depth of the cleared annular space along the pile determines the extent of the area of the jacket friction reduction. Accordingly, the annular space drill according to the invention drilled so far as a jacket friction reduction is desired. It is particularly preferred that the jacket friction reduction takes place in an upper region of the pile, and the annular space drill is correspondingly drilled from above.
  • the annular space drill can also be referred to as a hollow drill or as a core drill.
  • the pile may in particular be a bored pile, that is to say a pile which is introduced in a borehole.
  • the pile according to the invention can also be referred to as a bored pile, in particular as a large boring pile.
  • the pile can also be shaken, for example, as a precast element or otherwise introduced.
  • the pile may be an in-situ concrete pile.
  • a concrete pile may expediently at least one reinforcing element, preferably a reinforcement cage, which is surrounded by concrete.
  • a civil engineering tool in particular a drill bit, is first introduced into the ground to produce the cast-in-place pile, and the cavity formed during the introduction of the civil engineering tool is filled with liquid concrete.
  • filling with concrete can be done by pulling the drill, and by piping drilling while pulling the support tube.
  • the pile can also be a precast pile. In such a pile hardened elements are introduced into the ground, in particular screwed in, screwed wrapped or vibrated.
  • a preferred embodiment of the invention is that the pile is overdrilled when the liquid concrete of the pile begins to harden and / or is at least partially cured.
  • the fact that the pile is only over-drilled after the concrete has reached a certain strength it can be ensured that the structure of the concrete with the reinforcement cage by the over-drilling suffered no impairment.
  • the inner diameter of the annular space drill is at least as large as the outer diameter of the pile. This measure also serves to protect the pile structure when attaching the friction reduction.
  • the inner diameter of the annular space drill can be understood in particular to be an inner diameter of a pipe section and / or a drill bit arranged on the front side on the pipe section.
  • the inner diameter of the annular space drill is chosen so that it is at least as large as the outer diameter of the reinforcing cage and the necessary concrete cover the reinforcing cage.
  • the friction-reducing medium may be a fluid, in particular a suspension which can support the annulus against the surrounding borehole wall.
  • the medium may also be a bulk material and, for example, have round grain.
  • the medium can also be made thixotropic.
  • a foam can be used as a friction-reducing medium. To minimize the transmission of frictional forces, this is the friction-reducing Medium expediently non-hardening or at best little hardening.
  • the friction-reducing medium has a bentonite suspension, a bentonite-cement suspension, a polymer suspension or / and a soft gel.
  • the medium has the property that it does not run away in mobile floors, but seals, for example by the formation of a filter cake in the bottom of the annulus to the borehole wall.
  • the medium can also be introduced in the form of a soft gel, which may consist essentially of water glass and hardeners.
  • a soft gel which may consist essentially of water glass and hardeners.
  • Such a gel has a low shear strength, so that virtually no shear forces or shell friction forces can be transmitted to the pile shaft.
  • the medium may also be a mixture of water, clay flour such as bentonite and a self-hardening binder.
  • the material in the annulus receives only low compressive strengths and therefore can transmit even low shear stresses.
  • the introduced medium is chosen so that it does not run away from the annular space, but rather that the resulting annular space remains filled over a relatively long period of time. It has been observed that, when using a bentonite suspension, a filter cake is formed, in particular in the case of non-cohesive soils, which as a rule prevents the suspension from flowing away further.
  • the process complexity can be reduced by feeding the friction-reducing medium into the annular space via at least one line running on the annular space drill.
  • the tool which produces the annulus also serves at the same time to fill the annulus with the medium.
  • It can also be provided on the annular space drill several lines.
  • the line may in particular be arranged on the outside of the annular space drill and / or it may be from the ground level to near the earth side Pipe end of the annular space drill extend on which a drill bit with teeth can be located.
  • the friction-reducing medium may be considered to fill the friction-reducing medium into the annular space after the annular space drill is removed from the annular space.
  • the borehole wall must be stable.
  • the introduction of the friction-reducing medium can also be started before pulling the annular space drill, especially even when sinking the annular space drill.
  • the friction-reducing medium for example, serve as a rinsing and / or support fluid during the drilling of the annular space drill.
  • the friction-reducing medium is introduced at the latest when the annular space drill is withdrawn from the ground.
  • it may be expedient that the medium is introduced at the latest after reaching the lowest point in the annulus, while the soil material is conveyed on at least one helix of Annulus drill to the earth's surface.
  • the over-drilling takes place with the addition of a supporting and / or rinsing liquid.
  • the device according to the invention for producing a low-friction foundation element is formed with an annular space drill for over-drilling a pile, wherein the annular space drill has a pipe section, on the front side a drill bit is arranged, and wherein along the pipe section extends at least one line, which for supplying a friction-reducing medium in a ring space cleared when over-drilling the pile, and wherein the pipe section has at least one delivery spiral on the outside.
  • the device can be used in particular for carrying out the method according to the invention.
  • the friction-reducing medium can in principle consist of all materials that do not run away into the surrounding soil, but still have such a low strength and low viscosity that no significant skin friction forces can be transferred to the inner shaft of the pile.
  • the medium is preferably a bentonite suspension or a polymer suspension or a mixture of both. However, the medium may also be formed as a soft gel component.
  • the medium may also be a mixture of water, bentonite and a hardening binder, wherein this suspension is then adjusted in their strength so that they can transmit only slight shell friction forces, that is, shear stresses.
  • the conduit which serves to supply the friction-reducing medium can, for example, run parallel to the longitudinal axis of the pipe section. But it can also be arranged, for example, helically.
  • the line is arranged on the outside of the pipe section.
  • the line can run on the outer jacket of the tube. This makes it possible to drill with the annular space drill near the pile, so that in particular it can be avoided that less stable soil residues remain on the mantle of the pile.
  • the line extends into the region of the drill bit. This allows a particularly complete filling of the medium in the annulus. At the same time, any existing supporting or rinsing liquid can be displaced particularly effectively.
  • the line expediently extends from the earth's surface to the earth-side end of the pipe section.
  • the line expediently has an outlet opening which is arranged on the outer shell side of the annular space drill.
  • the pipe section has a length which is at least as large as the depth of the clearing annular space.
  • the annular space drill according to the invention usually longer than conventional core drills, which are lowered with the help of a Kelly bar several times in the hole.
  • the pipe section may have at least one delivery spiral on the outside.
  • a conveyor coil expediently extends at least approximately along the entire pipe section.
  • the conveyor coil can extend at least over a region which corresponds to the depth of the annular space to be produced.
  • the conveyor coil is expediently formed continuously. It can also be provided several conveyor coils.
  • the pipe section in the region of the drill bit has on the outside at least one further starter helix which extends over a partial region of the pipe section.
  • the beginner helix is present in addition to the delivery helix, so that an at least two-start arrangement is obtained.
  • the starter coil according to the invention extends in the lower, bottom-side region of the pipe section. It can support the loosening of the pending soil, wherein the material removal after over-ground takes place on account of the limited height of the beginners spiral finally over the conveyor spiral.
  • At least one cutting edge is arranged at the lower end of the conveying helix and / or the beginner helix.
  • Such a cutting edge can also protect the lower end of the respective coil from wear. Appropriately, therefore, the cutting edge on a carbide.
  • at least one flat cutting edge is arranged at the end of the conveying helix and / or the starter helix.
  • at least one of the above-mentioned cutting edges is designed as a flat cutting edge.
  • Such a flat blade can act as a blade, which promotes the soil material on the helix.
  • the flat cutting edge can in particular be arranged on a flat tooth.
  • the pipe section in particular in the region of the drill bit, ie in a drill bit side, Lower end portion, at least one passage opening for discharging material from the interior of the pipe section.
  • Solved concrete and soil material from the space between the pile shaft and the pipe inner wall can be conveyed outward through this passage opening, in order to get from there via the at least one spiral to the earth's surface.
  • the material can easily get out of the inner annulus in the outer annulus, it is expedient to provide a purge connection in the interior of the pipe section, for gaseous or liquid rinsing media.
  • At least one cutting edge is provided on the inner casing of the pipe section, which extends into the interior of the pipe section. With such an edge little stable soil material can be released from the mantle of the pile.
  • the cutting edge is expediently located in the region of the passage opening, so that efficient removal of material from the inside to the outside is ensured. Accordingly, it is particularly advantageous that at least one cutting edge is provided at the passage opening, which extends into the interior of the pipe section.
  • the drill bit can be occupied according to the invention with drill teeth and / or drill bits.
  • the drill bits or drill bits arranged at the lower end of the pipe section in the drill bit are preferably arranged to cut an outer diameter larger than the outer diameter of the pipe section and / or to intersect an inner diameter smaller than the inner diameter of the pipe section ,
  • Such an arrangement can ensure that the shaft of the pile does not jam in the interior of the pipe section. Accordingly, it is advantageous that the removal cross section of the drill bit projects beyond the pipe section on the inside and / or outside.
  • the device according to the invention has a drill drive for rotationally driving the annular space drill.
  • the device may be formed, for example, as a large rotary drilling rig with a mast on which the drilling drive is arranged vertically adjustable.
  • the device may comprise a flushing head, which allows fluid communication between a non-rotating connecting line and the conduit rotating together with the annular space drill, which is provided for supplying the friction-reducing medium.
  • the flushing head which can also be referred to as a rotary feedthrough, is expediently arranged between the drill drive and the annular space drill.
  • the pipe section has a lid which is connected via a flushing head directly to the rotary drive. Under the direct connection can be understood in particular that between the drill drive and pipe section no drill pipe is present.
  • FIGS. 1 to 3 An embodiment of a Ringraumbohrers invention 50 is in the FIGS. 1 to 3 shown.
  • the annular space drill 50 has a cylindrical tube section 51 on which a drill bit 52 with a plurality of drill teeth 53 is arranged on the front side.
  • a lid 55 At the opposite end face, the pipe section 51, as in particular in Fig. 3 can be seen, a lid 55.
  • this Cover 55 is expediently provided at least one passage opening for the supply of the medium and / or pressure equalization.
  • the lid 55 may also consist only of struts.
  • a beginner coil 64 On the outer surface of the tube section 51 of the annular space drill 50 two coils are arranged, a beginner coil 64 and a conveyor coil 62. While the beginner coil 64 extends only in the lower region of the tube section 51, that is in the region of the drill bit 52, the conveyor coil 62 is formed longer and extends almost along the entire pipe section 51. Typically, the beginner's turn 64 may be formed with 0.5 to 5 turns around the pipe section 51. In the illustrated embodiment, a circulation is provided. The conveyor coil 62 has a larger number of circulations than the beginner coil 64. At the lower end of the conveyor coil 62, a flat cutting edge 63 and at the lower end of the beginner's spiral 64, a flat cutting edge 65 is arranged.
  • the drill teeth 53 and the flat cutting edges 63, 65 are adapted to work below the annular space drill 50 located soil material to form an annular space when the annular space drill 50 is rotated in a method according to the invention about the longitudinal axis of the pipe section 51.
  • a pile located in the ground can be overdrilled, ie the annular space is cut around the shaft of the pile.
  • the flat cutting edges 63 and 65 are designed to release the bottom underneath the helices 62, 64, and in addition to deliver the loosened material to the helixes 62, 64.
  • the helices 62, 64 convey the dissolved material upwards when the annular space drill 50 is rotated about the longitudinal axis of the tube section 51 in the method according to the invention.
  • through holes 71 and 72 are provided in the pipe section, in the illustrated embodiment, for example, two diametrically opposite through holes 71 and 72 are given.
  • the passage openings 71, 72 are arranged at the level of at least one of the helices 62, 64. These through-holes 71, 72 allow during drilling operation material transport from the interior of the pipe section 51 to the outside and thus to the helices 62, 64 out.
  • At the through holes 71, 72 each have a flat cutting edge 73 and 74, respectively.
  • the scoop-like Flat cutters 73, 74 extend into the interior of the tube section 51. They can serve to remove soil material at the over-drilled pile and / or to convey soil material to the through-openings 71, 72.
  • protrusions 76 which serve as spacers to position the annular space drill 50 relative to the over-drilled pile.
  • the spacers 76 may also be disposed on the drill bit 52.
  • two lines 60 and 61 are provided in the illustrated embodiment, which extend on opposite sides of the pipe section 51 along the pipe section 51, and in the region of the drill bit 52 below Formation of outlet openings end.
  • the two lines 60, 61 penetrate the conveyor spiral 62 and the beginner coil 64.
  • the annular space drill 50 of the FIGS. 1 to 3 be operated by means of a drill drive 80 rotating.
  • This drill drive 80 is expediently coupled via a flushing head 81 with the cover 55 of the annular space drill 50, wherein the flushing head 81 serves for the rotatable coupling of the lines 60, 61 with a connection line, not shown.
  • FIGS. 4 to 8 are the successive process steps in an embodiment of a method according to the invention for creating a low-friction foundation element using the annular bore 50 of the FIGS. 1 to 3 shown.
  • a borehole 9 in the bottom 1 is first created by means of a drill 8 designed, for example, as a screw drill.
  • a reinforcement cage 12 is introduced into the wellbore 9 and the wellbore 9 is concreted to the desired height. As a result, a trained as a concrete pile pile 10 is obtained.
  • this post 10 is then over-drilled by means of the annular space drill 50, as soon as the concrete of the pile 10 is at least partially cured.
  • the annular space drill 50 is arranged coaxially to the post 10, by means of the in Fig. 7 shown drilling drive 80 in rotation offset and lowered along the post 10 in the bottom 1.
  • drilling drive 80 in rotation offset and lowered along the post 10 in the bottom 1.
  • Fig. 7 shows, the over-drilling is continued until with the annular space 50, the depth is reached, to which the skin friction of the pile 10 is to be reduced.
  • the annular space drill 50 is then pulled out of the annular space 3, wherein a friction-reducing medium 4 is introduced into the annular space 3 until the annular space 3 is filled (see. Fig. 8 ).
  • the finished pile 10 is thus separated in its upper part on the located in the annular space 3 friction-reducing medium 4 from the surrounding soil 1, so that in this upper region no significant friction force transmission between the pile 10 and the surrounding soil 1 more can take place.

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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)

Claims (16)

  1. Procédé de réalisation d'un élément de fondation à friction localement réduite, dans lequel
    - un pieu (10) est agrandi par forage dans le sol (1) au moins par endroits avec une foreuse (50) à chambre annulaire, et
    - l'espace annulaire (3) dégagé lors de l'agrandissement du pieu (10) est rempli avec un milieu (4) réducteur de friction.
  2. Procédé selon la revendication 1,
    caractérisé
    en ce que le pieu (10) est un pieu en béton coulé sur place, et
    en ce que, pour fabriquer le pieu en béton coulé sur place, un outil de génie civil, en particulier une foreuse (8), est d'abord enfoncé dans le sol (1), et l'espace vide formé pendant l'introduction de l'outil de génie civil est rempli de béton liquide.
  3. Procédé selon la revendication 2, caractérisé en ce que le pieu (10) est agrandi par forage lorsque le béton liquide du pieu (10) est au moins partiellement durci.
  4. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que le diamètre intérieur de la foreuse (50) à chambre annulaire est au moins aussi grand que le diamètre extérieur du pieu (10), y compris la nécessaire couverture en béton des fers d'armature.
  5. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que le milieu (4) réducteur de friction est un milieu liquide (4) et en particulier une suspension de bentonite, une suspension de bentonite et de ciment, une suspension de polymère et/ou un gel mou.
  6. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que le milieu (4) réducteur de friction est introduit dans l'espace annulaire par au moins une conduite (60, 61) s'étendant sur la foreuse (50) à chambre annulaire.
  7. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce qu'au moins une partie du milieu (4) réducteur de friction est introduite dans la chambre annulaire (3) lors du retrait de la foreuse (50) à chambre annulaire.
  8. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que l'agrandissement par forage s'effectue avec ajout d'un liquide de soutien et/ou de rinçage.
  9. Dispositif pour réaliser un élément de fondation à friction localement réduite, en particulier par un procédé selon l'une quelconque des revendications précédentes, avec
    une foreuse (50) à chambre annulaire pour agrandir par forage un pieu (10), la foreuse (50) à chambre annulaire présentant une section tubulaire (51) sur laquelle est placée frontalement une couronne de forage (52),
    dans lequel au moins une conduite (60, 61) s'étend le long de la section tubulaire (51), conduite qui sert à acheminer un milieu (4) réducteur de friction dans un espace annulaire (3) dégagé lors de l'agrandissement du pieu (10) par forage, et
    dans lequel la section tubulaire (51) comprend à l'extérieur au moins une spire de transport (62).
  10. Dispositif selon la revendication 9,
    caractérisé
    en ce que la conduite (60, 61) est placée à l'extérieur sur la section tubulaire (51), et -
    en ce que la conduite (60, 61) va jusqu'au niveau de la couronne de forage (52).
  11. Dispositif selon la revendication 9 ou 10, caractérisé en ce que la section de forage (51) présente une longueur qui est au moins aussi grande que la profondeur de l'espace annulaire (3) devant être dégagé.
  12. Dispositif selon l'une quelconque des revendications 9 à 11, caractérisé en ce que la section tubulaire (51) comprend à l'extérieur, au niveau de la couronne de forage (52), au moins une autre spire d'amorçage (64), qui s'étend sur une partie de la section tubulaire (51),
    dans lequel au moins un tranchant plat (63, 65) est placé à l'extrémité de la spire de transport (62) et/ou de la spire d'amorçage (64).
  13. Dispositif selon l'une quelconque des revendications 9 à 12, caractérisé en ce que la section tubulaire (51) comprend, au niveau de la couronne de forage (52), au moins un passage (71, 72) pour évacuer de la matière depuis l'intérieur de la section tubulaire (51),
    dans lequel au moins un tranchant (73, 74) est prévu sur le passage (71, 72), tranchant qui s'étend à l'intérieur de la section tubulaire (51).
  14. Dispositif selon l'une quelconque des revendications 9 à 13, caractérisé en ce que la section d'abattage de la couronne de forage (52) dépasse de la section tubulaire (51) vers l'intérieur et/ou vers l'extérieur.
  15. Dispositif selon l'une quelconque des revendications 9 à 14,
    caractérisé
    en ce qu'il comprend un entraînement de forage (80) pour entraîner en rotation la foreuse (50) à chambre annulaire, et
    en ce que la section tubulaire (51) est reliée directement à l'entraînement de forage (80) par l'intermédiaire d'une tête de rinçage (81).
  16. Dispositif selon l'une quelconque des revendications 9 à 15, caractérisé en ce que l'intérieur de la section tubulaire (51) est équipé d'un raccord de rinçage pour des milieux liquides et/ou gazeux.
EP20100004290 2010-04-22 2010-04-22 Procédé et dispositif d'établissement d'un élément de fondation à friction partiellement réduite Active EP2246482B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP20100004290 EP2246482B1 (fr) 2010-04-22 2010-04-22 Procédé et dispositif d'établissement d'un élément de fondation à friction partiellement réduite

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Application Number Priority Date Filing Date Title
EP20100004290 EP2246482B1 (fr) 2010-04-22 2010-04-22 Procédé et dispositif d'établissement d'un élément de fondation à friction partiellement réduite

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EP2246482A1 EP2246482A1 (fr) 2010-11-03
EP2246482B1 true EP2246482B1 (fr) 2012-06-20

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Publication number Priority date Publication date Assignee Title
FR2995917B1 (fr) * 2012-09-27 2014-10-17 Soletanche Freyssinet Procede de realisation d'un ancrage dans un sol
FR2995918B1 (fr) 2012-09-27 2014-10-17 Soletanche Freyssinet Procede de realisation d'une structure armee dans un sol
CN102926654B (zh) * 2012-11-12 2015-12-23 中铁十九局集团第五工程有限公司 桩孔环切系统及桩孔环切方法
CN109457698A (zh) * 2018-12-21 2019-03-12 兰州有色冶金设计研究院有限公司 消除胀缩土层摩擦力的套管预制桩及其施工方法

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DE19641422C2 (de) * 1996-10-08 2000-09-07 Willibald Fischer Verlorene Schalung für Betonbohrpfähle und Verfahren zu ihrer Herstellung
DE10023467C1 (de) * 2000-05-12 2001-09-27 Bauer Spezialtiefbau Bohrvorrichtung

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