EP3246470B1 - Soil working tool and method for producing wall lamellae - Google Patents

Soil working tool and method for producing wall lamellae Download PDF

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Publication number
EP3246470B1
EP3246470B1 EP16169918.6A EP16169918A EP3246470B1 EP 3246470 B1 EP3246470 B1 EP 3246470B1 EP 16169918 A EP16169918 A EP 16169918A EP 3246470 B1 EP3246470 B1 EP 3246470B1
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EP
European Patent Office
Prior art keywords
drilling
screw conveyor
ground
mixing tools
mixing
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EP16169918.6A
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German (de)
French (fr)
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EP3246470A1 (en
Inventor
Herbert Karl
André Seidel
Mario PERCONTI
Albert Rieblinger
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Bauer Spezialtiefbau GmbH
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Bauer Spezialtiefbau GmbH
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Priority to EP16169918.6A priority Critical patent/EP3246470B1/en
Priority to US15/583,840 priority patent/US10100481B2/en
Publication of EP3246470A1 publication Critical patent/EP3246470A1/en
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    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/18—Bulkheads or similar walls made solely of concrete in situ
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D17/00—Excavations; Bordering of excavations; Making embankments
    • E02D17/13—Foundation slots or slits; Implements for making these slots or slits
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
    • E02D3/12—Consolidating by placing solidifying or pore-filling substances in the soil
    • E02D3/126—Consolidating by placing solidifying or pore-filling substances in the soil and mixing by rotating blades
    • 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
    • E02D5/18—Bulkheads or similar walls made solely of concrete in situ
    • E02D5/187—Bulkheads or similar walls made solely of concrete in situ the bulkheads or walls being made continuously, e.g. excavating and constructing bulkheads or walls in the same process, without joints

Definitions

  • the invention relates to a harrow with at least two mutually parallel, elongated drilling and mixing tools, comprising a rod-shaped body, on which a first conveyor coil and at least one second conveyor coil are arranged, which is axially spaced from the first conveyor coil, according to the preamble of Claim 1.
  • the invention further relates to a method for producing wall lamellae in a floor having at least two mutually parallel, elongated drilling and mixing tools, which have a lower first conveyor coil and at least one upper second conveyor coil, wherein the drilling and mixing tools are driven in rotation and in the Soil are sunk, while soil material is removed and the removed soil material is mixed with a supplied binder suspension to a soil mortar, which hardens after pulling the drilling and mixing tools from the ground to the wall lamella, according to the preamble of claim 9.
  • the individual wall lamellae must be created with a very exact position to each other.
  • drilling and mixing tools to use, which have a corresponding length.
  • the risk of drilling and mixing tools sinking into the ground increases. This not only affects the sealing performance of the entire wall. Rather, considerable transverse and bending forces can be exerted on the typically 10 to 20 m long drilling and mixing tools by running the individual rod-shaped drilling and mixing tools.
  • the dynamic load during the rotating drive of the tools leads to a significant wear on the conveyor coils, the bar-shaped base body and the pivot bearings of the individual tools when bleeding.
  • the invention has for its object to provide a harrow and a method for producing wall lamella, with which wall lamellae can be produced efficiently and wear.
  • the first conveyor coil can be designed with an arbitrary length.
  • the lower first conveyor coil comprises a half to two helix turns, preferably a single helix rotation.
  • the axial length of the lower first conveyor coil remains relatively small, so that the friction wear occurring there is small.
  • the formation of a half to two spiral turns is sufficient for the function of the first conveyor coil for reliable removal of removed soil material from the bottom of the hole upwards.
  • At least one transverse yoke which connects the drilling and mixing tools, is arranged between the lower first conveying spiral and the upper, second conveying spiral.
  • two or more yokes may be provided.
  • At least one transverse yoke is arranged directly above the first conveyor helix.
  • the sections are combined with the lower first conveyor coils of the at least two drilling and mixing tools via at least one transverse yoke to a replaceable unit, which are detachably and non-rotatably connected via releasable connection means each with the rod-shaped bodies of the overlying second conveyor coils can.
  • a replaceable unit which are detachably and non-rotatably connected via releasable connection means each with the rod-shaped bodies of the overlying second conveyor coils can.
  • a particularly good stiffening of the overall arrangement is achieved according to a variant in that the drilling and mixing tools are rotatably mounted in the at least one transverse yoke.
  • mixing and / or stirring elements are additionally arranged at least in the region of the upper second conveying spiral.
  • the mixing and stirring elements may be formed, for example, by paddles, rods or other mechanical stirring elements.
  • the second conveyor coil may be formed by a plurality of sections. Between the individual sections of the conveyor spiral, the individual, preferably radially extending mixing and / or stirring elements may be attached to the rod-shaped base body.
  • a removal device for removing soil material is attached to a lower tip of the drilling and mixing tools.
  • the removal device can have one or more removal teeth.
  • the removal device preferably extends radially outward from a central region. Preferably, the removal device can extend over the entire bore diameter.
  • An outer diameter of the conveyor coil of the intermediate element may be smaller than or equal to the outer diameter of the upper second conveyor coil of the adjacent mixing and drilling tools.
  • the intermediate element has a smaller outer diameter at least in its lower region than the adjacent drilling and mixing tools.
  • the lower region of the intermediate element may be free of a lower conveying spiral.
  • individual mixing and / or stirring elements may be arranged in the lower region of the intermediate element.
  • a removal device for removing soil material in the intermediate region between the adjacent drilling and mixing tools may be provided.
  • the intermediate element and / or the rod-shaped basic body may be formed as tubes, via which binder suspension is fed into the bore.
  • a preferred embodiment of a soil cultivation device is characterized in that a mast is provided, along which a carriage is movably guided, on which the drilling and mixing tools are rotatably mounted. With the carriage so the drilling and mixing tools can be moved together as a tool unit together.
  • At least one rotary drive for rotating driving of the drilling and mixing tools is arranged on the carriage.
  • the rotary drive is preferably a hydraulic motor.
  • the carrier device is in particular a tracked vehicle with a superstructure rotatably mounted thereon, on which the vertically directed mast is mounted with the tool unit.
  • the method according to the invention is characterized in that a drill diameter which is greater than an outer diameter of the upper second delivery helix is produced by the lower first delivery helix on at least one drilling and mixing tool, wherein the upper second delivery helix is spaced from a bore wall.
  • a soil cultivating device is used, as previously described.
  • wall lamellae can be produced in the soil in an efficient way.
  • the occurring wear on the drilling and mixing tools and the tillage equipment is kept low overall.
  • the smaller diameter second conveyor coil is sufficient to the floor mortar to mix and to keep the solid components in suspension.
  • Due to the distance from the wall, an annular channel is formed around the second conveying spiral, which promotes an advantageous circulation in the bore.
  • a difference in diameter may be between 5 cm and 50 cm, preferably in the range of about 20 cm.
  • the invention will be described in more detail below with reference to a preferred embodiment, which is shown schematically in the drawing.
  • the single drawing shows a front view of a lower part of a harrow 10 according to the invention.
  • the soil cultivation device 10 according to the invention is constructed with respect to the carrier device, not shown, with a mast, as it is known from EP 2 395 153 B1 is known.
  • a tool unit 11 with two elongated drilling and mixing tools 20 are mounted vertically movable in the soil cultivation device 10 according to the invention.
  • a central, rod-shaped intermediate element 30 is arranged between the two parallel drilling and mixing tools 20, a central, rod-shaped intermediate element 30 is arranged.
  • the two drilling and mixing tools 20 are coupled together with the intermediate element 30 via a lower first transverse yoke 12 and an upper second transverse yoke 14.
  • first transverse yoke 12 and the second transverse yoke 14 the drilling and mixing tools 20 and the rod-shaped intermediate member 30 are rotatably mounted in each case via pivot bearings.
  • the two drilling and mixing tools 20 each have a lower first conveying helix 24 on their rod-shaped base body 22.
  • the first conveying spiral 24 extends from a removal device 28 with soil removal teeth over a turn to the lower end of the first transverse yoke 12.
  • the two drilling and mixing tools 20 each have an upper second conveying spiral 26, which each have several turns.
  • an outer diameter of the lower first delivery helix 24 is greater than an outer diameter of the upper second delivery helix 26.
  • a bore having a first bore diameter in the bottom is created together with the lower first conveying helix 24. Due to the larger outer diameter of the lower first conveyor coil 24, the smaller-diameter upper second conveyor coils 26 do not contact the bore wall during drilling. As a result, friction when drilling the bore is avoided, which has a positive effect on the drive power and the friction wear on the drilling and mixing tools 20.
  • the rod-shaped intermediate element 30 is also provided at its lower end with a removal device 28 with Abtragszähnen. In its lower region, the intermediate element 30 is held free of a conveyor coil. In an intermediate region between the first transverse yoke 12 and the second transverse yoke 14 further Abtragszähne 32 are mounted, which extend approximately radially to the axis of rotation of the intermediate member 30 to the outside and below.
  • a tubular base body of the rod-shaped intermediate element 30 is provided with a delivery helix 36.
  • the delivery helix 36 can have the same direction of rotation and configuration as the second delivery helix 26 of the right-side drilling and mixing tool 20, while the second delivery helix 26 of the left-side drilling and mixing tool 20 has an opposite helical rotation.
  • a binder suspension can be introduced into the bore, preferably under pressure, from outside the borehole.
  • the region of the lower first conveying helix 24 with the removal devices 28 of the two drilling and mixing tools 20 is detachably attached to the rod-shaped basic bodies 22 via a first connecting device 16.
  • the first connecting device 16 is a splined axial spline. This lower region is connected to one another via the first transverse yoke 12 and constitutes a replaceable unit.
  • a further segment of the drilling and mixing tools 20 and the intermediate element 30 can be easily detachably attached to the respective rod-shaped basic bodies 22.

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  • Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Civil Engineering (AREA)
  • Paleontology (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Agronomy & Crop Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Soil Sciences (AREA)
  • Bulkheads Adapted To Foundation Construction (AREA)
  • Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
  • Soil Working Implements (AREA)

Description

Die Erfindung betrifft ein Bodenbearbeitungsgerät mit mindestens zwei parallel zueinander angeordneten, länglichen Bohr- und Mischwerkzeugen, welche einen stangenförmigen Grundkörper umfassen, an welchem eine erste Förderwendel und mindestens eine zweite Förderwendel angeordnet sind, welche von der ersten Förderwendel axial beabstandet ist, gemäß dem Oberbegriff des Anspruchs 1.The invention relates to a harrow with at least two mutually parallel, elongated drilling and mixing tools, comprising a rod-shaped body, on which a first conveyor coil and at least one second conveyor coil are arranged, which is axially spaced from the first conveyor coil, according to the preamble of Claim 1.

Die Erfindung betrifft weiterhin ein Verfahren zum Herstellen von Wandlamellen in einem Boden mit mindestens zwei parallel zueinander angeordneten, länglichen Bohr- und Mischwerkzeugen, welche eine untere erste Förderwendel und mindestens eine obere zweite Förderwendel aufweisen, wobei die Bohr- und Mischwerkzeuge drehend angetrieben und in den Boden abgeteuft werden, dabei Bodenmaterial abgetragen wird und das abgetragene Bodenmaterial mit einer zugeführten Bindemittelsuspension zu einem Bodenmörtel vermischt wird, welcher nach dem Ziehen der Bohr- und Mischwerkzeuge aus dem Boden zu der Wandlamelle aushärtet, gemäß dem Oberbegriff des Anspruchs 9.The invention further relates to a method for producing wall lamellae in a floor having at least two mutually parallel, elongated drilling and mixing tools, which have a lower first conveyor coil and at least one upper second conveyor coil, wherein the drilling and mixing tools are driven in rotation and in the Soil are sunk, while soil material is removed and the removed soil material is mixed with a supplied binder suspension to a soil mortar, which hardens after pulling the drilling and mixing tools from the ground to the wall lamella, according to the preamble of claim 9.

Ein derartiges Bodenbearbeitungsgerät und ein derartiges Verfahren gehen aus der EP 2 395 153 B1 oder der DE 102 38 646 B3 hervor. Mit diesen bekannten Verfahren können in sehr effektiver Weise vertikale Wandlamellen im Boden erstellt werden, welche durch Überlappung eine vertikale Dicht- oder Stützwand bilden können.Such a harrow and such a method go out of EP 2 395 153 B1 or the DE 102 38 646 B3 out. With these known methods vertical wall slats can be created in the ground in a very effective manner, which can form a vertical sealing or supporting wall by overlapping.

Aus der US 5,368,415 geht ein Bodenbearbeitungsgerät hervor, welches parallel zueinander angeordnete Bodenbearbeitungswerkzeuge aufweist, welche über eine stabilisierende Stange miteinander verbunden sind.From the US 5,368,415 goes out a harrow, which has mutually parallel tillage tools, which are connected to each other via a stabilizing rod.

Damit die so erstellten Wände eine ausreichende Dichtfunktion erreichen, müssen die einzelnen Wandlamellen mit einer sehr exakten Position zueinander erstellt werden. Zur Herstellung relativ tiefer vertikaler Wände sind Bohr- und Mischwerkzeuge einzusetzen, welche eine entsprechende Länge aufweisen. Mit zunehmender Länge der Bohr- und Mischwerkzeuge erhöht sich die Gefahr, dass die Bohr- und Mischwerkzeuge beim Niederbringen in den Boden verlaufen. Hierdurch kann nicht nur die Dichtfunktion der gesamten Wand beeinträchtigt werden. Vielmehr können durch ein Verlaufen der einzelnen stangenförmigen Bohr- und Mischwerkzeuge erhebliche Quer- und Biegekräfte auf die typischerweise 10 bis 20 m langen Bohr- und Mischwerkzeuge ausgeübt werden. Die dynamische Belastung beim drehenden Antrieb der Werkzeuge führt bei einem Verlaufen zu einem erheblichen Verschleiß an den Förderwendeln, dem stangenförmigen Grundkörper sowie den Drehlagern der einzelnen Werkzeuge.So that the walls thus created achieve a sufficient sealing function, the individual wall lamellae must be created with a very exact position to each other. For the production of relatively deep vertical walls are drilling and mixing tools to use, which have a corresponding length. As the length of the drilling and mixing tools increases, the risk of drilling and mixing tools sinking into the ground increases. This not only affects the sealing performance of the entire wall. Rather, considerable transverse and bending forces can be exerted on the typically 10 to 20 m long drilling and mixing tools by running the individual rod-shaped drilling and mixing tools. The dynamic load during the rotating drive of the tools leads to a significant wear on the conveyor coils, the bar-shaped base body and the pivot bearings of the individual tools when bleeding.

Durch die Anordnung eines Querjochs und einer Zwischenführung, wie es in der EP 2 395 153 B1 gelehrt wird, kann zwar die Steifigkeit des Gesamtwerkzeuges erhöht und damit das Ausmaß eines Verlaufens reduziert werden. Beim Auftreten von Querkräften beim Bohren, etwa durch Fels- oder Gesteinsbrocken im Bohrkanal, kann auch die Gesamtanordnung abgelenkt werden. In diesem Fall verteilt sich der Verschleiß an den Förderwendeln, den stangenförmigen Grundkörpern und den Lagern über sämtliche Bohr- und Mischwerkzeuge.Due to the arrangement of a cross yoke and an intermediate guide, as in the EP 2 395 153 B1 Although the rigidity of the overall tool can be increased and thus the extent of bleeding can be reduced. When transverse forces occur during drilling, for example due to rocks or rocks in the drilling channel, the overall arrangement can also be deflected. In this case, the wear on the conveyor coils, the rod-shaped bodies and the bearings distributed over all drilling and mixing tools.

Der Erfindung liegt die Aufgabe zugrunde, ein Bodenbearbeitungsgerät und ein Verfahren zum Herstellen von Wandlamellen anzugeben, mit welchen Wandlamellen effizient und verschleißarm hergestellt werden können.The invention has for its object to provide a harrow and a method for producing wall lamella, with which wall lamellae can be produced efficiently and wear.

Die Aufgabe wird zum einen durch ein Bodenbearbeitungsgerät mit den Merkmalen des Anspruchs 1 und zum anderen durch ein Verfahren mit den Merkmalen des Anspruchs 9 gelöst. Bevorzugte Ausführungsformen der Erfindung sind in den abhängigen Ansprüchen angegeben.The object is achieved on the one hand by a harrow with the features of claim 1 and on the other hand by a method having the features of claim 9. Preferred embodiments of the invention are indicated in the dependent claims.

Grundsätzlich kann die erste Förderwendel mit einer beliebigen Länge ausgebildet sein. Eine bevorzugte Ausführungsform besteht jedoch darin, dass die untere erste Förderwendel eine halbe bis zwei Wendelumdrehungen, vorzugsweise eine einzelne Wendelumdrehung umfasst. Somit bleibt die axiale Länge der unteren ersten Förderwendel relativ klein, so dass auch der dort auftretende Reibungsverschleiß gering ist. Die Ausbildung einer halben bis zu zwei Wendelumdrehungen ist für die Funktion der ersten Förderwendel zum zuverlässigen Abtransport von abgetragenem Bodenmaterial vom Bohrgrund nach oben ausreichend.In principle, the first conveyor coil can be designed with an arbitrary length. A preferred embodiment, however, is that the lower first conveyor coil comprises a half to two helix turns, preferably a single helix rotation. Thus, the axial length of the lower first conveyor coil remains relatively small, so that the friction wear occurring there is small. The formation of a half to two spiral turns is sufficient for the function of the first conveyor coil for reliable removal of removed soil material from the bottom of the hole upwards.

Gemäß der Erfindung ist zwischen der unteren ersten Förderwendel und der oberen zweiten Förderwendel mindestens ein Querjoch angeordnet, welches die Bohr- und Mischwerkzeuge miteinander verbindet. Insbesondere können auch zwei oder mehrere Joche vorgesehen sein. Dabei ist zumindest ein Querjoch unmittelbar oberhalb der ersten Förderwendel angeordnet. Hierdurch wird eine gute Versteifung erreicht und die Gefahr eines Verlaufens der gesamten Werkzeuganordnung vermindert.According to the invention, at least one transverse yoke, which connects the drilling and mixing tools, is arranged between the lower first conveying spiral and the upper, second conveying spiral. In particular, two or more yokes may be provided. At least one transverse yoke is arranged directly above the first conveyor helix. As a result, a good stiffening is achieved and reduces the risk of bleeding of the entire tool assembly.

Bevorzugt ist es dabei, dass die Abschnitte mit den unteren ersten Förderwendeln der mindestens zwei Bohr- und Mischwerkzeuge über mindestens ein Querjoch zu einer auswechselbaren Einheit zusammengefasst sind, welche über lösbare Verbindungseinrichtungen jeweils mit den stangenförmigen Grundkörpern der darüber liegenden zweiten Förderwendeln lösbar und drehfest verbunden werden können. Damit können die Bohr- und Mischwerkzeuge mit den Abtragseinrichtungen einfach ausgetauscht werden.It is preferred that the sections are combined with the lower first conveyor coils of the at least two drilling and mixing tools via at least one transverse yoke to a replaceable unit, which are detachably and non-rotatably connected via releasable connection means each with the rod-shaped bodies of the overlying second conveyor coils can. In order to The drilling and mixing tools can be easily exchanged with the removal devices.

Eine besonders gute Versteifung der Gesamtanordnung wird nach einer Ausführungsvariante dadurch erzielt, dass die Bohr- und Mischwerkzeuge drehbar in dem mindestens einen Querjoch gelagert sind.A particularly good stiffening of the overall arrangement is achieved according to a variant in that the drilling and mixing tools are rotatably mounted in the at least one transverse yoke.

Weiterhin ist es nach einer Ausführungsvariante der Erfindung vorteilhaft, dass zumindest im Bereich der oberen zweiten Förderwendel zusätzlich Misch- und/oder Rührelemente angeordnet sind. Die Misch- und Rührelemente können etwa durch Paddel, Stäbe oder sonstige mechanische Rührorgane ausgebildet sein. Die zweite Förderwendel kann durch mehrere Teilstücke gebildet sein. Zwischen den einzelnen Teilstücken der Förderwendel können die einzelnen, sich vorzugsweise radial erstreckenden Misch- und/oder Rührelemente am stangenförmigen Grundkörper angebracht sein. Durch diese Misch- und Rührelemente kann eine besonders gute Vermischung zwischen dem abgetragenen Bodenmaterial und einer zugeführten Bindemittelsuspension zu dem Bodenmörtel erreicht werden.Furthermore, it is advantageous according to an embodiment variant of the invention that mixing and / or stirring elements are additionally arranged at least in the region of the upper second conveying spiral. The mixing and stirring elements may be formed, for example, by paddles, rods or other mechanical stirring elements. The second conveyor coil may be formed by a plurality of sections. Between the individual sections of the conveyor spiral, the individual, preferably radially extending mixing and / or stirring elements may be attached to the rod-shaped base body. By means of these mixing and stirring elements, a particularly good mixing between the removed soil material and a supplied binder suspension to the soil mortar can be achieved.

Für einen guten Bohrfortschritt ist es nach einer Weiterbildung der Erfindung vorteilhaft, dass an einer unteren Spitze der Bohr- und Mischwerkzeuge eine Abtragseinrichtung zum Abtragen von Bodenmaterial angebracht ist. Die Abtragseinrichtung kann einen oder mehrere Abtragszähne aufweisen. Vorzugsweise erstreckt sich die Abtragseinrichtung von einem Mittenbereich radial nach außen. Vorzugsweise kann sich die Abtragseinrichtung über den gesamten Bohrdurchmesser erstrecken.For a good drilling progress, it is advantageous according to a development of the invention that a removal device for removing soil material is attached to a lower tip of the drilling and mixing tools. The removal device can have one or more removal teeth. The removal device preferably extends radially outward from a central region. Preferably, the removal device can extend over the entire bore diameter.

Zur Bildung überlappender Bohrungen zum Bilden von im Querschnitt ovalen Wandlamellen mit einer möglichst gleichen Breite ist es nach einer Weiterbildung der Erfindung vorteilhaft, dass zwei Bohr- und Mischwerkzeuge vorgesehen sind, zwischen denen ein stangenförmiges Zwischenelement angeordnet ist, welches in seinem oberen Bereich eine Förderwendel aufweist. Ein Außendurchmesser der Förderwendel des Zwischenelementes kann kleiner oder gleich dem Außendurchmesser der oberen zweiten Förderwendel der angrenzenden Misch- und Bohrwerkzeuge sein.To form overlapping holes for forming oval cross-section wall lamellae with the same width as possible, it is advantageous according to a development of the invention that two drilling and mixing tools are provided, between which a rod-shaped intermediate element is arranged, which has a delivery spiral in its upper region , An outer diameter of the conveyor coil of the intermediate element may be smaller than or equal to the outer diameter of the upper second conveyor coil of the adjacent mixing and drilling tools.

Gemäß der Erfindung weist das Zwischenelement zumindest in seinem unteren Bereich einen kleineren Außendurchmesser als die angrenzenden Bohr- und Mischwerkzeuge auf. Insbesondere kann der untere Bereich des Zwischenelementes frei von einer unteren Förderwendel sein. Gegebenenfalls können einzelne Misch- und/oder Rührelemente in dem unteren Bereich des Zwischenelementes angeordnet sein. An einer unteren Spitze des Zwischenelementes kann eine Abtragseinrichtung zum Abtragen von Bodenmaterial im Zwischenbereich zwischen den benachbarten Bohr- und Mischwerkzeugen vorgesehen sein. Das Zwischenelement und/oder die stangenförmigen Grundkörper können als Rohre ausgebildet sein, über welche in die Bohrung Bindemittelsuspension zugeführt wird.According to the invention, the intermediate element has a smaller outer diameter at least in its lower region than the adjacent drilling and mixing tools. In particular, the lower region of the intermediate element may be free of a lower conveying spiral. Optionally, individual mixing and / or stirring elements may be arranged in the lower region of the intermediate element. At a lower tip of the intermediate element, a removal device for removing soil material in the intermediate region between the adjacent drilling and mixing tools may be provided. The intermediate element and / or the rod-shaped basic body may be formed as tubes, via which binder suspension is fed into the bore.

Eine bevorzugte Ausführungsvariante eines erfindungsgemäßen Bodenbearbeitungsgeräts ist dadurch gekennzeichnet, dass ein Mast vorgesehen ist, entlang welchem ein Schlitten verfahrbar geführt ist, an welchem die Bohr- und Mischwerkzeuge drehbar gelagert sind. Mit dem Schlitten können so die Bohr- und Mischwerkzeuge als eine Werkzeugeinheit gemeinsam verfahren werden.A preferred embodiment of a soil cultivation device according to the invention is characterized in that a mast is provided, along which a carriage is movably guided, on which the drilling and mixing tools are rotatably mounted. With the carriage so the drilling and mixing tools can be moved together as a tool unit together.

Dabei ist es nach einer Weiterbildung vorteilhaft, dass mindestens ein Drehantrieb zum drehenden Antreiben der Bohr- und Mischwerkzeuge an dem Schlitten angeordnet ist. Der Drehantrieb ist vorzugsweise ein Hydraulikmotor.It is advantageous according to a development that at least one rotary drive for rotating driving of the drilling and mixing tools is arranged on the carriage. The rotary drive is preferably a hydraulic motor.

Ein besonders effizienter Betrieb wird nach einer Weiterbildung der Erfindung dadurch erreicht, dass ein fahrbares Trägergerät vorgesehen ist. Das Trägergerät ist insbesondere ein Raupenfahrzeug mit einem daran drehbar gelagerten Oberwagen, an welchem der vertikal gerichtete Mast mit der Werkzeugeinheit gelagert ist.A particularly efficient operation is achieved according to a development of the invention in that a mobile carrier device is provided. The carrier device is in particular a tracked vehicle with a superstructure rotatably mounted thereon, on which the vertically directed mast is mounted with the tool unit.

Das erfindungsgemäße Verfahren ist dadurch gekennzeichnet, dass durch die untere erste Förderwendel an zumindest einem Bohr- und Mischwerkzeug ein Bohrdurchmesser erzeugt wird, welcher größer ist als ein Außendurchmesser der oberen zweiten Förderwendel, wobei die obere zweite Förderwendel von einer Bohrungswand beabstandet ist. Vorzugsweise wird ein Bodenbearbeitungsgerät eingesetzt, wie es zuvor beschrieben wurde.The method according to the invention is characterized in that a drill diameter which is greater than an outer diameter of the upper second delivery helix is produced by the lower first delivery helix on at least one drilling and mixing tool, wherein the upper second delivery helix is spaced from a bore wall. Preferably, a soil cultivating device is used, as previously described.

Mit dem erfindungsgemäßen Verfahren können in effizienter Weise Wandlamellen im Boden hergestellt werden. Dabei wird der auftretende Verschleiß an den Bohr- und Mischwerkzeugen sowie dem Bodenbearbeitungsgerät insgesamt gering gehalten. Die durchmesserkleinere zweite Förderwendel ist ausreichend, um den Bodenmörtel zu mischen und die Feststoffbestandteile in Suspension zu halten. Durch den Abstand zur Wand wird um die zweite Förderwendel ein Ringkanal gebildet, welcher eine vorteilhafte Zirkulation in der Bohrung fördert. Ein Durchmesserunterschied kann zwischen 5 cm und 50 cm, vorzugsweise im Bereich von ca. 20 cm, betragen.With the method according to the invention, wall lamellae can be produced in the soil in an efficient way. The occurring wear on the drilling and mixing tools and the tillage equipment is kept low overall. The smaller diameter second conveyor coil is sufficient to the floor mortar to mix and to keep the solid components in suspension. Due to the distance from the wall, an annular channel is formed around the second conveying spiral, which promotes an advantageous circulation in the bore. A difference in diameter may be between 5 cm and 50 cm, preferably in the range of about 20 cm.

Die Erfindung wird nachfolgend anhand eines bevorzugten Ausführungsbeispieles näher beschrieben, welches schematisch in der Zeichnung dargestellt ist. Die einzige Zeichnung zeigt eine Vorderansicht eines unteren Teils eines erfindungsgemäßen Bodenbearbeitungsgeräts 10.The invention will be described in more detail below with reference to a preferred embodiment, which is shown schematically in the drawing. The single drawing shows a front view of a lower part of a harrow 10 according to the invention.

Das erfindungsgemäße Bodenbearbeitungsgerät 10 ist hinsichtlich des nicht dargestellten Trägergerätes mit einem Mast so aufgebaut, wie es aus der EP 2 395 153 B1 bekannt ist. Entlang des nicht dargestellten Mastes sind bei dem erfindungsgemäßen Bodenbearbeitungsgerät 10 eine Werkzeugeinheit 11 mit zwei länglichen Bohr- und Mischwerkzeugen 20 vertikal verfahrbar gelagert. Zwischen den beiden parallel gerichteten Bohr- und Mischwerkzeugen 20 ist ein mittiges, stangenförmiges Zwischenelement 30 angeordnet.The soil cultivation device 10 according to the invention is constructed with respect to the carrier device, not shown, with a mast, as it is known from EP 2 395 153 B1 is known. Along the mast, not shown, a tool unit 11 with two elongated drilling and mixing tools 20 are mounted vertically movable in the soil cultivation device 10 according to the invention. Between the two parallel drilling and mixing tools 20, a central, rod-shaped intermediate element 30 is arranged.

In dem dargestellten unteren Bereich sind die beiden Bohr- und Mischwerkzeuge 20 mit dem Zwischenelement 30 über ein unteres erstes Querjoch 12 und ein oberes zweites Querjoch 14 miteinander gekoppelt. In dem ersten Querjoch 12 und dem zweiten Querjoch 14 sind die Bohr- und Mischwerkzeuge 20 sowie das stangenförmige Zwischenelement 30 jeweils über Drehlager drehend gelagert.In the illustrated lower area, the two drilling and mixing tools 20 are coupled together with the intermediate element 30 via a lower first transverse yoke 12 and an upper second transverse yoke 14. In the first transverse yoke 12 and the second transverse yoke 14, the drilling and mixing tools 20 and the rod-shaped intermediate member 30 are rotatably mounted in each case via pivot bearings.

In ihrem unteren Bereich unterhalb des ersten Querjochs 12 weisen die beiden Bohr- und Mischwerkzeuge 20 an ihrem stangenförmigen Grundkörper 22 jeweils eine untere erste Förderwendel 24 auf. Die erste Förderwendel 24 erstreckt sich dabei von einer Abtragseinrichtung 28 mit Bodenabtragszähnen über eine Windung bis zum unteren Ende des ersten Querjochs 12. In einem oberen Bereich über dem zweiten Querjoch 14 weisen die beiden Bohr- und Mischwerkzeuge 20 jeweils eine obere zweite Förderwendel 26 auf, welche jeweils mehrere Windungen aufweisen. Erfindungsgemäß ist ein Außendurchmesser der unteren ersten Förderwendel 24 größer als ein Außendurchmesser der oberen zweiten Förderwendel 26.In their lower region below the first transverse yoke 12, the two drilling and mixing tools 20 each have a lower first conveying helix 24 on their rod-shaped base body 22. In this case, the first conveying spiral 24 extends from a removal device 28 with soil removal teeth over a turn to the lower end of the first transverse yoke 12. In an upper region above the second transverse yoke 14, the two drilling and mixing tools 20 each have an upper second conveying spiral 26, which each have several turns. According to the invention, an outer diameter of the lower first delivery helix 24 is greater than an outer diameter of the upper second delivery helix 26.

Durch die Abtragseinrichtungen 28 an den unteren Spitzen der Bohr- und Mischwerkzeuge 20 wird zusammen mit der unteren ersten Förderwendel 24 jeweils eine Bohrung mit einem ersten Bohrdurchmesser im Boden erstellt. Aufgrund des größeren Außendurchmessers der unteren ersten Förderwendel 24 kontaktieren die durchmesserkleineren oberen zweiten Förderwendeln 26 beim Abteufen nicht die Bohrungswand. Hierdurch wird Reibung beim Abteufen der Bohrung vermieden, was sich positiv auf die Antriebsleistung und den Reibungsverschleiß an den Bohr- und Mischwerkzeugen 20 auswirkt.By means of the removal devices 28 at the lower tips of the drilling and mixing tools 20, a bore having a first bore diameter in the bottom is created together with the lower first conveying helix 24. Due to the larger outer diameter of the lower first conveyor coil 24, the smaller-diameter upper second conveyor coils 26 do not contact the bore wall during drilling. As a result, friction when drilling the bore is avoided, which has a positive effect on the drive power and the friction wear on the drilling and mixing tools 20.

Um die beiden Bohrungen, welche durch die zueinander beabstandeten Bohr- und Mischwerkzeuge 20 gebildet werden, miteinander zum Bilden eines etwa ovalen Bohrquerschnitts zu verbinden, ist das stangenförmige Zwischenelement 30 an seinem unteren Ende ebenfalls mit einer Abtragseinrichtung 28 mit Abtragszähnen versehen. In seinem unteren Bereich ist das Zwischenelement 30 frei von einer Förderwendel gehalten. In einem Zwischenbereich zwischen dem ersten Querjoch 12 und dem zweiten Querjoch 14 sind weitere Abtragszähne 32 angebracht, welche sich etwa radial zur Drehachse des Zwischenelementes 30 nach außen und unten erstrecken.In order to connect the two bores, which are formed by the spaced-apart drilling and mixing tools 20, with each other to form an approximately oval drill cross-section, the rod-shaped intermediate element 30 is also provided at its lower end with a removal device 28 with Abtragszähnen. In its lower region, the intermediate element 30 is held free of a conveyor coil. In an intermediate region between the first transverse yoke 12 and the second transverse yoke 14 further Abtragszähne 32 are mounted, which extend approximately radially to the axis of rotation of the intermediate member 30 to the outside and below.

In einem oberen Bereich oberhalb des zweiten Querjochs 14 ist ein rohrförmiger Grundkörper des stangenförmigen Zwischenelementes 30 mit einer Förderwendel 36 versehen. Die Förderwendel 36 kann dabei dieselbe Drehrichtung und Ausgestaltung aufweisen wie die zweite Förderwendel 26 des rechtsseitigen Bohr- und Mischwerkzeuges 20, während die zweite Förderwendel 26 des linksseitigen Bohr- und Mischwerkzeuges 20 eine entgegengesetzte Wendeldrehung aufweist. Über mindestens eine Austrittsöffnung 34 am unteren Ende des rohrförmigen Zwischenelementes 30 kann von außerhalb des Bohrlochs eine Bindemittelsuspension in die Bohrung vorzugsweise unter Druck eingeleitet werden. Durch die drehende Bewegung der Bohr- und Mischwerkzeuge 20 und des Zwischenelementes 30 wird das abgetragene Bodenmaterial mit der Bindemittelsuspension vermischt, wobei ein aushärtender Bodenmörtel gebildet wird. Der Bodenmörtel kann nach Rückziehen der Werkzeugeinheit 11 aus dem Bohrloch zu einer Wandlamelle zum Bilden einer Stütz- oder Dichtwand aushärten.In an upper region above the second transverse yoke 14, a tubular base body of the rod-shaped intermediate element 30 is provided with a delivery helix 36. The delivery helix 36 can have the same direction of rotation and configuration as the second delivery helix 26 of the right-side drilling and mixing tool 20, while the second delivery helix 26 of the left-side drilling and mixing tool 20 has an opposite helical rotation. Via at least one outlet opening 34 at the lower end of the tubular intermediate element 30, a binder suspension can be introduced into the bore, preferably under pressure, from outside the borehole. By the rotating movement of the drilling and mixing tools 20 and the intermediate element 30, the removed soil material is mixed with the binder suspension, whereby a hardening soil mortar is formed. The floor mortar can harden after retraction of the tool unit 11 from the wellbore to a wall lamella for forming a support or sealing wall.

Der Bereich der unteren ersten Förderwendel 24 mit den Abtragseinrichtungen 28 der beiden Bohr- und Mischwerkzeuge 20 ist über eine erste Verbindungseinrichtung 16 lösbar an den stangenförmigen Grundkörpern 22 angebracht. Die erste Verbindungseinrichtung 16 ist eine axiale Wellenverbindung mit Keilnutenverzahnung. Dieser untere Bereich ist über das erste Querjoch 12 miteinander verbunden und stellt eine wechselbare Einheit dar.The region of the lower first conveying helix 24 with the removal devices 28 of the two drilling and mixing tools 20 is detachably attached to the rod-shaped basic bodies 22 via a first connecting device 16. The first connecting device 16 is a splined axial spline. This lower region is connected to one another via the first transverse yoke 12 and constitutes a replaceable unit.

Über eine entsprechende zweite Verbindungseinrichtung 18 oberhalb des zweiten Querjochs 14 kann ein weiteres Segment der Bohr- und Mischwerkzeuge 20 sowie des Zwischenelementes 30 leicht lösbar an den jeweiligen stangenförmigen Grundkörpern 22 angebracht werden.Via a corresponding second connecting device 18 above the second transverse yoke 14, a further segment of the drilling and mixing tools 20 and the intermediate element 30 can be easily detachably attached to the respective rod-shaped basic bodies 22.

Claims (9)

  1. Ground-working machine having at least two elongate drilling and mixing tools (20) arranged parallel to each other, which comprise a rod-form base body (22), on which a first screw conveyor (24) and at least one second screw conveyor (26) are arranged, the second screw conveyor being axially spaced apart from the first screw conveyor (24),
    wherein at least on one drilling and mixing tool (20) at a lower end the first screw conveyor (24) is formed with an outer diameter that is greater than an outer diameter of the second screw conveyor (26), which is arranged above the first screw conveyor (24).
    characterised in
    that at least one transverse yoke (12, 14) is arranged between the lower first screw conveyor (24) and the upper second screw conveyor (26), the transverse yoke connecting the drilling and mixing tools (20) to each other,
    that two drilling and mixing tools (20) are provided, between which a rod-form intermediate element (30) is arranged, which has a screw conveyor (36) in its upper area, and
    that the intermediate element (30) has, at least in its lower area, a smaller outer diameter than the neighbouring drilling and mixing tools (20).
  2. Ground-working machine according to claim 1,
    characterised in
    that the lower first screw conveyor (24) has a half to two spiral rotations, preferably a single spiral rotation.
  3. Ground-working machine according to claim 2,
    characterised in
    that the drilling and mixing tools (20) are rotatably mounted in the at least one transverse yoke (12, 14).
  4. Ground-working machine according to one of claims 1 to 3,
    characterised in
    that at least in the area of the upper second screw conveyor (26), mixing and / or agitating elements are additionally arranged.
  5. Ground-working machine according to one of claims 1 to 4,
    characterised in
    that a removal means (28) for removing ground material is attached to a lower tip of the drilling and mixing tools (20).
  6. Ground-working machine according to one of claims 1 to 5,
    characterised in
    that a mast is provided, along which a carriage is movably guided, on which the drilling and mixing tools (20) are rotatably mounted.
  7. Ground-working machine according to claim 6,
    characterised in
    that at least one rotary drive is arranged on the carriage for driving in rotation the drilling and mixing tools (20).
  8. Ground-working machine according to one of claims 1 to 7,
    characterised in
    that a drivable carrier unit is provided.
  9. Method for producing wall panels in a ground with a ground-working machine (10) according to one of claims 1 to 8, having
    at least two elongate drilling and mixing tools (20) arranged parallel to each other, which have a lower first screw conveyor (24) and at least one upper second screw conveyor (26), wherein
    - the drilling and mixing tools (20) are driven in rotation and sunk into the ground,
    - ground material is thereby removed and
    - the removed ground material is mixed with an added binder suspension to a ground mortar,
    - which sets to the wall panel after the drilling and mixing tools (20) have been pulled out of the ground,
    characterised in
    - that through the lower first screw conveyor (24) on at least one drilling and mixing tool (20), a bore diameter is produced that is greater than an outer diameter of the upper second screw conveyor (26), wherein the upper second screw conveyor (26) is spaced apart from a bore wall.
EP16169918.6A 2016-05-17 2016-05-17 Soil working tool and method for producing wall lamellae Active EP3246470B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP16169918.6A EP3246470B1 (en) 2016-05-17 2016-05-17 Soil working tool and method for producing wall lamellae
US15/583,840 US10100481B2 (en) 2016-05-17 2017-05-01 Ground-working machine and method for producing wall panels

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP16169918.6A EP3246470B1 (en) 2016-05-17 2016-05-17 Soil working tool and method for producing wall lamellae

Publications (2)

Publication Number Publication Date
EP3246470A1 EP3246470A1 (en) 2017-11-22
EP3246470B1 true EP3246470B1 (en) 2018-12-19

Family

ID=56026670

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16169918.6A Active EP3246470B1 (en) 2016-05-17 2016-05-17 Soil working tool and method for producing wall lamellae

Country Status (2)

Country Link
US (1) US10100481B2 (en)
EP (1) EP3246470B1 (en)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5118223A (en) * 1988-03-23 1992-06-02 Osamu Taki Multi-shaft auger apparatus and process for forming soilcrete columns and walls and grids in situ in soil
US4906142A (en) * 1988-03-23 1990-03-06 S.M.W. Seiko, Inc. Side cutting blades for multi-shaft auger system and improved soil mixing wall formation process
US5368415A (en) * 1993-02-18 1994-11-29 S. M. W. Seiko Spiral flights for improved soil mixing and efficient boring for use on multi-shaft auger soil mixing apparatus
US5575345A (en) 1994-11-15 1996-11-19 Chemical Grouting Company. Ltd. Multi shaft drilling unit
DE10238646B3 (en) 2002-08-23 2004-04-01 Bauer Spezialtiefbau Gmbh Production of water-tight vertical walls used in the production of building foundations comprises forming secondary lamellae in the spaces between the primary lamellae, and forming homogenizing lamellae between the other lamellae
EP2395153B1 (en) 2010-06-11 2013-03-27 Bauer Spezialtiefbau GmbH Device and method for manufacturing wall panels in the floor

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
US10100481B2 (en) 2018-10-16
EP3246470A1 (en) 2017-11-22
US20170335535A1 (en) 2017-11-23

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