EP1359257B1 - Drill and method for drilling the soil - Google Patents

Drill and method for drilling the soil Download PDF

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Publication number
EP1359257B1
EP1359257B1 EP03009634A EP03009634A EP1359257B1 EP 1359257 B1 EP1359257 B1 EP 1359257B1 EP 03009634 A EP03009634 A EP 03009634A EP 03009634 A EP03009634 A EP 03009634A EP 1359257 B1 EP1359257 B1 EP 1359257B1
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EP
European Patent Office
Prior art keywords
boring
strings
yoke
string
drill
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EP03009634A
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German (de)
French (fr)
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EP1359257A1 (en
Inventor
Erwin Dipl.-Ing. Wirtsch.-Ing. Stötzer
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Bauer Maschinen GmbH
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Bauer Maschinen GmbH
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Priority claimed from DE10301072A external-priority patent/DE10301072A1/en
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    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D3/00Improving or preserving soil or rock, e.g. preserving permafrost soil
    • E02D3/12Consolidating by placing solidifying or pore-filling substances in the soil
    • E02D3/126Consolidating by placing solidifying or pore-filling substances in the soil and mixing by rotating blades

Definitions

  • the invention relates to a drilling apparatus according to the preamble of claim 1 and a method for creating a Bore in the ground according to the preamble of claim 5.
  • the drill radii of the adjacent drillstrings overlap.
  • the cutting devices must the individual drill string axially offset from each other to be ordered.
  • This is usually done by a so-called yoke.
  • This is a bar-shaped component in which the drillstrings are rotatably mounted and interconnected. The yoke can continue to have the task, possibly remaining soil material webs additional shear between the adjacent holes and thus to participate in the comminution of the soil material.
  • the range of drill strings from the drill bit to the yoke serves the so-called preparation of the soil, i. the Crushing the soil material and feeding the suspension.
  • preparation of the soil i. the Crushing the soil material and feeding the suspension.
  • the crushing of the soil material are not only the actual cutting devices for breaking and shearing of the soil at the top of the drill strings, but also the adjacent conveyor spirals, which one not insignificant shear and thus crushing effect on the Exercise soil material.
  • the curable suspension is supplied.
  • the mixing elements are arranged, which for the best possible mixing and homogenization the curable suspension with the comminuted Provide soil material.
  • JP-A-10292362 Another drilling device is disclosed in JP-A-10292362.
  • This known drilling device also has three side by side arranged, drivable drivelines on, which are coupled together at their bottom end via a yoke are.
  • JP-A-08027772 discloses a harrow with two staggered drill strings, which are connected by an entangled yoke.
  • the invention has for its object to provide a drilling apparatus and a method with which holes for high-quality foundation elements in the ground can be created particularly economically and with high directional stability.
  • the drilling device is characterized, inter alia characterized in that the yoke in the area of the offset middle Drill strings an entanglement in the direction of the offset having. So the yoke is not a straight beam formed, but has according to the offset of the middle Bohrstranges an angular displacement, a so-called Entanglement on. This allows the arrangement of the yoke relatively close to the drill bits, resulting in a good stiffening of the Drill strands to each other near the cutting leads leads to which the largest torques at the individual drill strings attack.
  • one conventional straight beam yoke allows the invention Entanglement a complete or at least partial Compensation of different drill string lengths in the treatment area.
  • the distance of the drill bits to the yoke can be so despite the axial offset of the individual drill strings the same or at least approximately balanced.
  • the offset of the middle drill string is designed according to the invention that this drill string is axially shorter than the outer drillstrings is.
  • the Bohrradien the cutting means of the adjacent drillstrings overlap.
  • the distance between the center axes of the Drill strands to each other smaller than the bore diameter of respective cutting device.
  • drill radii can also be cutting inserts be formed on the yoke, which for as constant as possible Ensure bore wall width.
  • a suspension feed for a curable suspension is provided on at least one of the drill strings.
  • the suspension feed is provided on the middle drill string formed, which in relation to the other drill strings in particular is set back.
  • the supply takes place via a corresponding Pumping device via the tubular design Drill string, with the exit at or near the drill bit he follows.
  • the mixing elements can Mixing or conveying paddle, which is substantially radial protrude from the drill string.
  • the cutting device arranged a conveyor coil on the respective drill string is, thereby forming a treatment area below the yoke is.
  • the helical Forderwendel serves for Removal of the crushed soil material from the Cutting device and a further crushing of the chipped material.
  • the feeder a first mixing, the so-called processing the mixture of the soil material and the suspension.
  • the conveyor coil can have any length and also made of segments with different pitch and diameter be constructed.
  • a particularly compact arrangement is after the invention achieved in that the conveyor coil is not has more than one pitch. Already with a half to a pitch is a reliable removal of the soil material and a desired additional comminution effect reached.
  • the method according to the invention is characterized among other things by that the respective treatment areas of the individual drill string below the yoke by pivoting of the yoke in the direction of the offset of the middle Drill strings are at least partially offset each other.
  • This will be a particularly uniform crushing of the soil material achieves what for the creation of drilling walls represents a significant advantage.
  • the yoke can be arranged very close to the drill bits, resulting in a good stiffening and thus a high directional stability when drilling down the holes contributes.
  • the drill strings with be lowered at a continuous speed.
  • this may be carried out in a uniform and continuous manner, wherein in this case by the special inventive arrangement of Drilling device already a mixing of the crushed soil material can be done.
  • a drill 1 for the creation represented by mortar eyes. It is on a vertical Mast 2, which is also in two planes to the vertical axis is pivotable, a drilling device 3 attached. On one along the drilling mast 2 movable carriage 4 are located there are three rotary drives 5 ', 5' ', 5' '', which each have a drive device 6 ', 6' ', 6' '' have. The three rotary drives 5 ', 5' ', 5' '' are mounted on a common carriage 4 and can only be moved together along the mast 2.
  • each Abtriebseinrichung 6 ', 6' ', 6' '' is a drill string 7 ', 7' ', 7' '' arranged.
  • drill strings 7 ', 7' ', 7 '' ' are essentially tubular components, which at their lower, the indicated hole 8 facing Ends drill bits 9 ', 9' ', 9' '' and one each Cutting device 10 ', 10' ', 10' '' for cutting the soil exhibit.
  • To the cutting devices 10 ', 10' ', 10' '' close to conveyor coils 11 ', 11' ', 11' '', which have at most one to three pitches.
  • a common guide 13 of the three drill strings Above the conveyor coils 11 ', 11' ', 11' '' of the three drill strings 7 is a common guide 13 of the three drill strings. Above the common guide 13 are on the drill strings 7 ', 7' ', 7' '' paddle or mixing elements 14 attached, which mix the drilled cuttings. These Mixing elements 14 have a corresponding projection to the To overlap each area of action, as they in terms of height are arranged one above the other. In order to reduce the effective range of the paddle or to increase mixing elements 14, they are in a particular Angle to the horizontal plane arranged. That's it possible to make a wall of overcut mortar columns.
  • the length of the mixing area on the drill strings 7 ', 7' ', 7 '' ' has a smaller proportion of the total length of Drill strands to ensure sufficient torque for the mixing of the To raise soil.
  • Located above the paddle assembly turn a common leadership 15 for the three Boring.
  • This guide 15 sits movably on the three Drill strands 7 ', 7' ', 7' '' and can along the residual length move the three drill strings.
  • the movable guide 15 has a funnel-shaped formation 16, with which they at Drilling the drill strings into a funnel-shaped receptacle 17 engages which rigidly attached to the lower end of the drill mast 2 is.
  • the supply of the suspension takes place either over the middle Drill string 7 '' 'or over all three drill strings 7', 7 '', 7 '' '.
  • the suspension is in each case in the region of the tips 9 ', 9' ', 9' '' fed to the cuttings.
  • the outlet openings for the suspension is at the middle drill string 7 '' ' in its lower part. All outlets are against Blockage by cuttings are protected and located during drilling in a protected from cuttings area.
  • Fig. 3 is the staggered arrangement of the middle drill string 7 '' 'opposite the two outer drill strings 7 ', 7' 'shown in more detail.
  • All three drill strings 7 have an identically formed cutting device 9 at its bottom end and a to it subsequent conveyor coil 11 with about a pitch on. Due to the overlapping arrangement of Bohrradien is the middle drill string 7 '' 'by about one pitch of the conveyor coil 11 set back.
  • the middle drill string 7'''' Due to the overlapping arrangement of Bohrradien is the middle drill string 7 '' 'by about one pitch of the conveyor coil 11 set back.
  • the middle drill string 7'''' are at the two outer Drill strings 7 ', 7' 'each have a smaller diameter conveyor coil 18 '' arranged, which a collision-free rotary drive allow between the individual drill strings 7.
  • a rigid bar-shaped yoke 20 is provided.
  • This points for the three drill strings 7 each have a storage area 26, in which the drill strings 7 each rotatable and axially fixed are stored.
  • a sufficient space for the conveyor coil 11 '' 'according to the invention achieved in that in a middle Region of the yoke 20 an entanglement 22 is provided is.
  • the entanglement 22 consists of two angled webs, which the two outer bearing portions 26 with the middle Connect storage area 26.
  • the actual ones are Work areas of the drill string 7 below the Yokes 20, which form the so-called treatment area, at least approximately balanced.
  • the treatment area is decisive for the slicing and chopping of the soil as well for a first mixing of the crushed soil material with suspension.
  • the processing of the crushed soil in the treatment area on all three drill strings 7 largely uniform.
  • a uniform preparation is advantageous for producing a uniform, high-quality foundation pillar or foundation wall.
  • the invention will by the invention to a more uniform torque load All three drill strings and a uniform tool wear reached.
  • edges 24 are formed, which according to the Anwinkelung approximately in a 45 Angle to Bohrstrangachse run. This angled arrangement the edges 24 is for shearing remaining soil webs between the adjacent holes advantageous. The angling of the edges 24 facilitates shearing remaining floor bars and thus facilitates overall the lowering of the drilling device.
  • the only partially closed Mixed range which consists of an array of paddle-shaped Mixing elements on the drill strings 7 consists.
  • To the Compensation of the entanglement 22 on the yoke 20 are at the two outer drill strings 7 ', 7' 'still immediately after the yoke 20 each have an additional conveying spiral 19 ', 19' ' formed with about a pitch.
  • the lower part of the drilling device with the yoke 20 and the lower ends of each Drill string 7 can be formed as a separate part, which via a schematically illustrated shaft-hub connection 28 pushed axially on the drill string 7 and rotatably connected to these can.
  • a method for creating a secant bored pile wall for example from mortar columns.
  • a pre-mine ditch created.
  • a predetermined depth drilled out is approximately at the length of Conveying spiral 11 ', 11 ", 11' '' and the mixing elements 14th occupied part of the drill string 7 ', 7' ', 7' '' oriented. The Boring happens in such a way that no soil is mined becomes.
  • the Suspension is a water-binder mixture, which is self-curing. This process will be repeated several times repeatedly until the suspension liquefies the soil. there just as much suspension is added as in the pore volume of the soil can be absorbed. The mixing process will be like this long continued until suspension exits in the advance pit.
  • This procedure is used in the following depth ranges repeatedly until the desired final depth is reached. It This is a continuous drilling and mixing process.
  • pulling the drill string can be sand or another Material to be blown to a special strength to reach the foundation pillar.

Abstract

The yoke (20) connecting the three drill strings (7'-7''') together is cranked upward (22) at the center and has bearings (26) for the drill strings. There are cutting tools (9'-9''') at the tip of each drill string, and spiral flutes (11'-11''') carry the cut rock upward. The outer drill strings have spiral flutes (19'19'') above the bearings in the yoke. There are mixing paddles (14) on all three drill strings above the yoke.

Description

Die Erfindung betrifft eine Bohrvorrichtung gemäß dem Oberbegriff des Anspruchs 1 sowie ein Verfahren zum Erstellen einer Bohrung im Boden gemäß dem Oberbegriff des Anspruchs 5.The invention relates to a drilling apparatus according to the preamble of claim 1 and a method for creating a Bore in the ground according to the preamble of claim 5.

Im Tiefbau ist die Errichtung von Umschließungswänden oder Gründungselementen im Boden bekannt, bei welchen im Boden nebeneinanderliegende Bohrungen eingebracht werden, welche zusammen einen schlitzförmigen Bohrraum bilden. Dieser wird in der Regel gleichzeitig mit dem Niederbringen der Bohrung mit einer aushärtbaren Suspension verfüllt. Diese Suspension wird zumindest mit einem Teil des zerkleinerten Bodenmaterials vermischt, wobei diese Materialmischung im ausgehärteten Zustand die Umschließungswand bzw. das Gründungselement im Boden bildet.In civil engineering is the construction of enclosing walls or Foundation elements known in the ground, in which adjacent to each other in the ground Holes are introduced, which together form a slot-shaped drilling space. This one will be in usually with the sinking of the hole filled a curable suspension. This suspension will at least mixed with a part of the comminuted soil material, this material mixture in the cured state forms the Umschließungswand or the foundation element in the ground.

Aus der DE 693 31 552 T2 und der US 4,909,675 sind gattungsgemäße Bohrvorrichtungen mit mindestens drei nebeneinander angeordneten, drehend antreibbaren Bohrsträngen mit jeweils einer Schneideinrichtung an ihrem bodenseitigen Ende und mindestens einem Joch bekannt. Das bodenseitige Ende des mittleren Bohrstranges ist mit einem Versatz zu den äußeren Bohrsträngen angeordnet. In dem Joch sind die Bohrstränge drehbar gelagert und miteinander gekoppelt. Diese Bohrvorrichtungen erlauben ein rotierendes Antreiben und gleichzeitiges Absenken der nebeneinander angeordneten Bohrstränge, was ein besonders wirtschaftliches Erstellen einer Bohrwand erlaubt. From DE 693 31 552 T2 and US 4,909,675 are generic Drilling devices with at least three juxtaposed, rotationally drivable drill strings with one each Cutting device at its bottom end and at least known to a yoke. The bottom end of the middle drill string is arranged with an offset to the outer drill strings. The drill strings are rotatably mounted in the yoke and coupled with each other. These drilling devices allow a rotating driving and simultaneous lowering of the side by side arranged drillstrings, which is a particularly economical Creating a drill wall allowed.

Für eine durchgehende Bohrwand ist es in der Regel erforderlich, dass sich die Bohrradien der angrenzenden Bohrstränge überschneiden. Um eine Kollision der einzelnen Schneideinrichtungen der Bohrstränge zu vermeiden, müssen die Schneideinrichtungen der einzelnen Bohrstränge axial zueinander versetzt angeordnet werden. Weiterhin ist es gerade bei größeren Bohrtiefen erforderlich, dass die einzelnen Bohrstränge in ihrem unteren Bereich miteinander gekoppelt und so versteift werden. Dies geschieht üblicherweise durch ein sogenanntes Joch. Dies ist ein balkenförmiges Bauteil, in welchem die Bohrstränge drehbar gelagert und miteinander verbunden sind. Das Joch kann weiterhin die Aufgabe haben, eventuell verbliebene Bodenmaterialstege zwischen den angrenzenden Bohrungen zusätzlich abzuscheren und so bei der Zerkleinerung des Bodenmaterials mitzuwirken.For a through hole, it is usually necessary that the drill radii of the adjacent drillstrings overlap. To a collision of the individual cutting devices To avoid the drillstrings, the cutting devices must the individual drill string axially offset from each other to be ordered. Furthermore, it is especially for larger drilling depths required that the individual drill strings in their bottom area coupled together and so stiffened. This is usually done by a so-called yoke. This is a bar-shaped component in which the drillstrings are rotatably mounted and interconnected. The yoke can continue to have the task, possibly remaining soil material webs additional shear between the adjacent holes and thus to participate in the comminution of the soil material.

Der Bereich der Bohrstränge von der Bohrspitze bis zum Joch dient dabei der sogenannten Aufbereitung des Bodens, d.h. dem Zerkleinern des Bodenmaterials und der Zuführung der Suspension. Für das Zerkleinern des Bodenmaterials sind dabei nicht nur die eigentlichen Schneideinrichtungen zum Brechen und Abscheren des Bodens an der Spitze der Bohrstränge maßgeblich, sondern auch die angrenzenden Förderwendeln, welche eine nicht unerhebliche Scher- und damit Zerkleinerungswirkung auf das Bodenmaterial ausüben. In diesem Bereich unterhalb des Jochs wird auch die aushärtbare Suspension zugeführt.The range of drill strings from the drill bit to the yoke serves the so-called preparation of the soil, i. the Crushing the soil material and feeding the suspension. For the crushing of the soil material are not only the actual cutting devices for breaking and shearing of the soil at the top of the drill strings, but also the adjacent conveyor spirals, which one not insignificant shear and thus crushing effect on the Exercise soil material. In this area below the yoke also the curable suspension is supplied.

In dem Bereich oberhalb des Jochs sind die Mischelemente angeordnet, welche für eine möglichst gute Vermischung und Homogenisierung der aushärtbaren Suspension mit dem zerkleinerten Bodenmaterial sorgen.In the area above the yoke, the mixing elements are arranged, which for the best possible mixing and homogenization the curable suspension with the comminuted Provide soil material.

Um eine hochqualitative Bohrwand zu erstellen, ist in dem sogenannten Aufbereitungsbereich der Bohrvorrichtung eine möglichst gleichmäßige Zerkleinerung des Bodenmateriales von entscheidender Bedeutung. Um eine möglichst gleichmäßige Zerkleinerung des Bodenmateriales durch alle drei Bohrstränge im Aufbereitungsbereich zu gewährleisten, muss zwischen den axial zueinander versetzten Bohrspitzen und dem Joch ein ausreichender Platz verbleiben. Andererseits ist es für eine gute Versteifung und damit für einen höheren Bohrfortschritt vorteilhaft, wenn das Versteifungsjoch möglich nahe an den Bohrspitzen angeordnet ist.To create a high quality drill wall, is in the so-called Preparation area of the drilling device one possible even shredding of the soil material of decisive Importance. For a uniform shredding as possible of the soil material through all three drill strings in the treatment area to ensure that between the axial drill bits offset from each other and the yoke sufficient Remain space. On the other hand it is for a good stiffening and thus advantageous for a higher drilling progress, if the stiffening yoke is possible close to the drill bits is arranged.

Eine weitere Bohrvorrichtung geht aus der JP-A-10292362 hervor. Diese bekannte Bohrvorrichtung weist ebenfalls drei nebeneinander angeordnete, drehend antreibbare Bohrstränge auf, die an ihrem bodenseitigen Ende über ein Joch miteinander gekoppelt sind. Ferner offenbart die JP-A-08027772 ein Bodenbearbeitungsgerät mit zwei versetzt angeordneten Bohrsträngen, die über ein verschränktes Joch miteinander verbunden sind.Another drilling device is disclosed in JP-A-10292362. This known drilling device also has three side by side arranged, drivable drivelines on, which are coupled together at their bottom end via a yoke are. Further, JP-A-08027772 discloses a harrow with two staggered drill strings, which are connected by an entangled yoke.

Eine weitere Vorrichtung und ein Verfahren zum Erstellen von Bohrungen sind aus der DE 42 19 150 C1 bekannt. Bei diesem bekannten Verfahren wird eine Bohrschnecke korkenzieherartig in das Erdreich eingedreht. Ab einer bestimmten Tiefe wird der Vortrieb der Bohrschnecke gestoppt, wobei die Bohrschnecke jedoch weiter drehend angetrieben wird. Hierdurch erfolgt ein Abscheren und Zerkleinern des Bodens. Das zerkleinerte Bodenmaterial wird entlang der Förderschnecke in einen oberen Bereich innerhalb des Bohrloches gefördert, wobei das gleichzeitige Zuführen einer aushärtbaren Suspension diese mit dem zerkleinerten Bodenmaterial vermischt wird. Durch diese Mischung entsteht ein zylindermantelförmiger Filterkuchen um die Bohrungswandung herum. Dieser dient als ein zylinderförmiger Stützmantel, mit welchem die Eigenschaften der erstellten Gründungssäulen hinsichtlich Festigkeit und Tragfähigkeit verbessert werden.Another device and method for creating Holes are known from DE 42 19 150 C1. In this known The method is a corkscrew in a the soil is screwed in. From a certain depth of the Propulsion of the auger stopped, however, the auger continues to be driven in rotation. This is done Shearing and crushing the soil. The crushed soil material gets into an upper area along the screw conveyor promoted within the borehole, with the simultaneous Apply a curable suspension this with the crushed Soil is mixed. Through this mixture creates a cylinder jacket-shaped filter cake around the bore wall around. This serves as a cylindrical one Support mantle with which the properties of the created Foundation columns improved in terms of strength and load capacity become.

Der Erfindung liegt die Aufgabe zugrunde, eine Bohrvorrichtung und ein Verfahren zu schaffen, mit welchen Bohrungen für qualitativ besonders hochwertige Gründungselemente im Boden besonders wirtschaftlich und mit hoher Richtungsstabilität erstellt werden können. The invention has for its object to provide a drilling apparatus and a method with which holes for high-quality foundation elements in the ground can be created particularly economically and with high directional stability.

Die Aufgabe wird durch eine Vorrichtung mit den Merkmalen des Anspruchs 1 bzw. durch ein Verfahren mit den Merkmalen des Anspruchs 5 gelöst. Bevorzugte Ausführungsformen sind in den jeweils abhängigen Ansprüchen angegeben.The object is achieved by a device with the characteristics of Claim 1 or by a method having the features of the claim 5 solved. Preferred embodiments are in each of specified dependent claims.

Die erfindungsgemäße Bohrvorrichtung ist unter anderem dadurch gekennzeichnet, dass das Joch im Bereich des versetzten mittleren Bohrstranges eine Verschränkung in Richtung des Versatzes aufweist. Das Joch ist also nicht als ein gerader Balken ausgebildet, sondern weist entsprechend dem Versatz des mittleren Bohrstranges eine winkelförmige Versetzung, eine sogenannte Verschränkung auf. Dies erlaubt die Anordnung des Joches relativ nah an den Bohrspitzen, was zu einer guten Versteifung der Bohrstränge zueinander nahe der Schneideinrichtungen führt, an welchen die größten Drehmomente an den einzelnen Bohrsträngen angreifen. Gleichzeitig wird aber trotz des axialen Versatzes der Bohrstränge zueinander gerade in dem versetzten Bohrstrangbereich ein ausreichender Platz für den Aufbereitungsbereich gewährleistet, welcher für ein möglichst gleichmäßiges Zerkleinern des Bodenmateriales notwendig ist. Gegenüber einem herkömmlichen geraden Balkenjoch erlaubt die erfindungsgemäße Verschränkung einen vollständigen oder zumindest teilweisen Ausgleich der unterschiedlichen Bohrstranglängen im Aufbereitungsbereich. Der Abstand der Bohrspitzen zum Joch kann so trotz des axialen Versatzes der einzelnen Bohrstränge gleich oder zumindest annähernd ausgeglichen ausgebildet werden.The drilling device according to the invention is characterized, inter alia characterized in that the yoke in the area of the offset middle Drill strings an entanglement in the direction of the offset having. So the yoke is not a straight beam formed, but has according to the offset of the middle Bohrstranges an angular displacement, a so-called Entanglement on. This allows the arrangement of the yoke relatively close to the drill bits, resulting in a good stiffening of the Drill strands to each other near the cutting leads leads to which the largest torques at the individual drill strings attack. At the same time but despite the axial offset the drillstrings to each other straight in the staggered drill string area sufficient space for the treatment area ensures which one is as even as possible Shredding the soil material is necessary. Opposite one conventional straight beam yoke allows the invention Entanglement a complete or at least partial Compensation of different drill string lengths in the treatment area. The distance of the drill bits to the yoke can be so despite the axial offset of the individual drill strings the same or at least approximately balanced.

Aufgrund der ausgeglicheneren Arbeitslängen der Bohrstrang im Aufbereitungsbereich unterhalb des Jochs wird auch die Drehmomentbelastung und der Werkzeugverschleiß an den einzelnen Bohrsträngen vergleichmäßigt, was sich positiv auf den Wartungsaufwand auswirkt.Due to the more balanced working lengths of the drill string in the Processing area below the yoke is also the torque load and the tool wear on the individual Drills equalized, which has a positive effect on maintenance effect.

Der Versatz des mittleren Bohrstranges ist erfindungsgemäß so ausgebildet, dass dieser Bohrstrang axial kürzer als die äußeren Bohrstränge ist.The offset of the middle drill string is designed according to the invention that this drill string is axially shorter than the outer drillstrings is.

Nach der Erfindung ist vorgesehen, dass sich die Bohrradien der Schneideinrichtungen der einander angrenzenden Bohrstränge überschneiden. Dabei ist der Abstand der Mittenachsen der Bohrstränge zueinander kleiner als der Bohrungsdurchmesser der jeweiligen Schneideinrichtung. Je größer der Grad der Überschneidung, umso gleichmäßiger ist der Dickenverlauf innerhalb der erstellten Bohrungswand. Bei nur geringfügig überschneidenden Bohrradien können jedoch auch Schneidplatten an dem Joch ausgebildet sein, welche für eine möglichst konstante Bohrwandbreite sorgen.According to the invention it is provided that the Bohrradien the cutting means of the adjacent drillstrings overlap. The distance between the center axes of the Drill strands to each other smaller than the bore diameter of respective cutting device. The greater the degree of overlap, the more even the thickness is within the created hole wall. With only slightly overlapping However, drill radii can also be cutting inserts be formed on the yoke, which for as constant as possible Ensure bore wall width.

Für eine besonders wirtschaftliche Erstellung von Bohrwänden oder Gründungselementen ist es nach der Erfindung vorteilhaft, dass eine Suspensionszuführung fur eine aushärtbare Suspension an mindestens einem der Bohrstränge vorgesehen ist. Vorzugsweise ist die Suspensionszuführung am mittleren Bohrstrang ausgebildet, welcher gegenüber den anderen Bohrsträngen insbesondere rückversetzt ist. Die Zuführung erfolgt über eine entsprechende Pumpeinrichtung über den rohrförmig ausgebildeten Bohrstrang, wobei der Austritt an oder in der Nähe der Bohrspitze erfolgt.For a particularly economical creation of drilling walls or foundation elements, it is advantageous according to the invention, that a suspension feed for a curable suspension is provided on at least one of the drill strings. Preferably is the suspension feed on the middle drill string formed, which in relation to the other drill strings in particular is set back. The supply takes place via a corresponding Pumping device via the tubular design Drill string, with the exit at or near the drill bit he follows.

Nach der Erfindung ist es weiterhin bevorzugt, dass oberhalb des Jochs entlang der Bohrstränge Mischelemente zum Bilden eines Mischbereiches angeordnet sind. Die Mischelemente können Misch- oder Förderpaddel sein, welche im Wesentlichen radial von dem Bohrstrang abstehen. Diese sorgen dafür, dass die eingeleitete Suspension mit einem Teil des zerkleinerten Bodenmaterials vermengt und weitgehend homogenisiert wird.According to the invention it is further preferred that above the yoke along the drill string mixing elements to form a Mixing area are arranged. The mixing elements can Mixing or conveying paddle, which is substantially radial protrude from the drill string. These ensure that the initiated Suspension with a portion of the crushed soil material mixed and largely homogenized.

Für eine möglichst gute Zerkleinerung des Bodenmaterials ist es erfindungsgemäß, dass im Anschluss an die Schneideinrichtung eine Förderwendel an dem jeweiligen Bohrstrang angeordnet ist, wodurch ein Aufbereitungsbereich unterhalb des Jochs gebildet ist. Die schneckenförmige Forderwendel dient dabei zum Abtransportieren des zerkleinerten Bodenmateriales von der Schneideinrichtung sowie zu einer weiteren Zerkleinerung des abgespanten Materials. Gleichzeitig erfolgt durch die Zuführung der Suspension ein erstes Vermischen, das sogenannte Aufbereiten der Mischung aus dem Bodenmaterial und der Suspension.For the best possible comminution of the soil material is according to the invention, that following the cutting device arranged a conveyor coil on the respective drill string is, thereby forming a treatment area below the yoke is. The helical Forderwendel serves for Removal of the crushed soil material from the Cutting device and a further crushing of the chipped material. At the same time done by the feeder the suspension a first mixing, the so-called processing the mixture of the soil material and the suspension.

Die Förderwendel kann eine beliebige Länge aufweisen und auch aus Segmenten mit unterschiedlicher Steigung und Durchmesser aufgebaut sein. Eine besonders kompakte Anordnung wird nach der Erfindung dadurch erreicht, dass die Förderwendel nicht mehr als eine Ganghöhe aufweist. Bereits mit einer halben bis einer Ganghöhe wird ein zuverlässiger Abtransport des Bodenmaterials sowie ein gewünschter zusätzlicher Zerkleinerungseffekt erreicht.The conveyor coil can have any length and also made of segments with different pitch and diameter be constructed. A particularly compact arrangement is after the invention achieved in that the conveyor coil is not has more than one pitch. Already with a half to a pitch is a reliable removal of the soil material and a desired additional comminution effect reached.

Das erfindungsgemäße Verfahren ist unter anderem dadurch gekennzeichnet, dass die jeweiligen Aufbereitungsbereiche der einzelnen Bohrstränge unterhalb des Jochs durch eine Verschwenkung des Jochs in Richtung des Versatzes des mittleren Bohrstranges zumindest teilweise zueinander ausgeglichen werden. Hierdurch wird eine besonders gleichmäßige Zerkleinerung des Bodenmaterials erreicht, was für die Erstellung von Bohrwänden einen maßgeblichen Vorteil darstellt. Gleichzeitig kann das Joch sehr nah an den Bohrspitzen angeordnet werden, was zu einer guten Versteifung und damit einer hohen Richtungsstabilität beim Niederbringen der Bohrungen beiträgt.The method according to the invention is characterized among other things by that the respective treatment areas of the individual drill string below the yoke by pivoting of the yoke in the direction of the offset of the middle Drill strings are at least partially offset each other. This will be a particularly uniform crushing of the soil material achieves what for the creation of drilling walls represents a significant advantage. At the same time the yoke can be arranged very close to the drill bits, resulting in a good stiffening and thus a high directional stability when drilling down the holes contributes.

Zur Erstellung von Bohrwänden mit einer möglichst gleichmäßigen Bohrwandbreite ist es erfindungsgemäß, dass die durch die Bohrstränge erstellten Bohrungen sich überschneiden.For creating drilling walls with a uniform as possible Bohrwandbreite it is according to the invention, that by the Drill strands created holes overlap.

Weiterhin ist es nach der Erfindung vorgesehen, dass in dem Aufbereitungsbereich unterhalb des Jochs Bodenmaterial zerkleinert wird und dass in einem Mischbereich oberhalb des Jochs mittels Mischelementen das zerkleinerte Bodenmaterial mit zugeführter Suspension vermengt wird. Das Joch stellt dabei die Trennung zwischen dem unteren Aufbereitungsbereich, welcher für die Zerkleinerung des Bodenmaterials maßgeblich ist, und dem Mischbereich dar, in welchem die Materialmischung eingestellt und homogenisiert wird.Furthermore, it is provided according to the invention that in the Processing area below the yoke Ground material crushed and that in a mixing area above the Yoke by means of mixing elements the crushed soil material is mixed with supplied suspension. The yoke stops the separation between the lower treatment area, which is decisive for the comminution of the soil material is, and the mixing area, in which the material mixture adjusted and homogenized.

Zur Kompensation der Drehmomenteinwirkung auf die Bohrvorrichtung ist es erfindungsgemäß, dass die beiden äußeren Bohrstränge in einer entgegengesetzten Drehrichtung angetrieben werden. Zur Erstellung einer möglichst homogenen Bohrwandmasse ist es erfindungsgemäß bevorzugt, dass die Suspensionszuführung über den mittleren Bohrstrang erfolgt. For compensation of the torque effect on the drilling device It is according to the invention that the two outer drill strings driven in an opposite direction of rotation become. To create the most homogeneous Bohrwandmasse it is inventively preferred that the suspension feed via the middle drill string.

Weiter ist es erfindungsgemäß, dass beim Ziehen der Bohrstränge Sand oder ein anderes Material in die Bohrung eingeblasen wird. Es kann sich hierbei um ein feinkörniges oder anderes, die Festigkeit der Säulen erhöhendes Material handeln, dessen Zuführung während des Mischvorganges und der Ausbildung der speziellen Auskleidung der Bohrungswand nicht erwünscht ist. Das Einblasen kann über einen der Bohrstränge, insbesondere über den zur Suspensionszuführung vorgesehenen Bohrstrang, erfolgen.It is also according to the invention that when pulling the drill strings Sand or other material blown into the hole becomes. It may be a fine-grained or other the strength of the column increasing material act whose Feeding during the mixing process and the formation of special lining of the bore wall is not desired. The blowing in can take place via one of the drill strings, in particular via the drill string provided for the suspension feed.

Bei dem erfindungsgemäßen Verfahren konnen die Bohrstränge mit einer kontinuierlichen Geschwindigkeit abgeteuft werden. Zur Verbesserung der Konsistenz der aushärtbaren Suspension zur Bildung der Gründungselemente ist es nach der Erfindung vorteilhaft, dass zum Vermischen die Bohrstränge in bestimmten Zeitabschnitten nach oben verfahren und wieder abgesenkt werden. Während der Zeitperioden des Abteufens kann dies jedoch in gleichmäßiger und kontinuierlicher Weise erfolgen, wobei hierbei durch die spezielle erfindungsgemäße Anordnung der Bohrvorrichtung bereits eine Vermischung des zerkleinerten Bodenmaterials erfolgen kann.In the method according to the invention, the drill strings with be lowered at a continuous speed. to Improvement of the consistency of the hardenable suspension for Formation of the foundation elements, it is advantageous according to the invention, that for mixing the drillstrings in certain Move up and down periods of time. However, during the time periods of the drilling, this may be carried out in a uniform and continuous manner, wherein in this case by the special inventive arrangement of Drilling device already a mixing of the crushed soil material can be done.

Die Erfindung sowie die sich hieraus ergebenden Vorteile werden im Zusammenhang mit bevorzugten Ausführungsbeispielen näher erläutert, welche schematisch in den beigefügten Zeichnungen dargestellt ist. In den Zeichnungen zeigen:

Fig. 1
eine schematische Teilvorderansicht eines erfindungsgemäßen Bohrgerätes;
Fig. 2
eine Seitenansicht des erfindungsgemäßen Bohrgerätes einschließlich einer zugehörigen Transporteinrichtung und
Fig. 3
eine vergrößerte Detailansicht einer erfindungsgemäßen Bohrvorrichtung mit dem verschränkten Joch.
The invention as well as the resulting advantages will be explained in more detail in connection with preferred embodiments, which is shown schematically in the accompanying drawings. In the drawings show:
Fig. 1
a schematic partial front view of a drilling device according to the invention;
Fig. 2
a side view of the drilling device according to the invention including an associated transport device and
Fig. 3
an enlarged detail view of a drilling device according to the invention with the crossed yoke.

Gemäß den Figuren 1 und 2 ist ein Bohrgerät 1 zur Erstellung von Mörtelsaulen dargestellt. Dabei wird an einem senkrechten Mast 2, der auch in zwei Ebenen zur vertikalen Achse verschwenkbar ist, eine Bohrvorrichtung 3 angebracht. Auf einem längs des Bohrmastes 2 beweglichen Schlitten 4 befinden sich drei Drehantriebe 5', 5'', 5''', welche jeweils eine Antriebseinrichtung 6', 6'', 6''' besitzen. Die drei Drehantriebe 5', 5'', 5''' sind auf einem gemeinsamen Schlitten 4 befestigt und können nur gemeinsam längs des Mastes 2 bewegt werden.According to Figures 1 and 2, a drill 1 for the creation represented by mortar eyes. It is on a vertical Mast 2, which is also in two planes to the vertical axis is pivotable, a drilling device 3 attached. On one along the drilling mast 2 movable carriage 4 are located there are three rotary drives 5 ', 5' ', 5' '', which each have a drive device 6 ', 6' ', 6' '' have. The three rotary drives 5 ', 5' ', 5' '' are mounted on a common carriage 4 and can only be moved together along the mast 2.

An jeder Abtriebseinrichung 6', 6'', 6''' ist ein Bohrstrang 7', 7'', 7''' angeordnet. Bei diesen Bohrsträngen 7', 7'', 7''' handelt es sich im Wesentlichen um rohrförmige Bauteile, welche an ihren unteren, dem angedeuteten Bohrloch 8 zugewandten Enden Bohrspitzen 9', 9'', 9''' sowie jeweils eine Schneideinrichtung 10', 10'', 10''' zum Aufschneiden des Erdreichs aufweisen. An die Schneideinrichtungen 10', 10'', 10''' schließen sich Förderwendeln 11', 11'', 11''' an, welche höchstens ein bis drei Ganghöhen besitzen. Dabei übergreifen die Bohrwendeln 11', 11'' der beiden Bohrstränge 7', 7'' im voreilenden Bereich den mittleren Bohrstrang 7''' fast vollständig. In Höhe der Förderwendel 10''' des mittleren Bohrstranges 7''' haben die beiden äußeren Bohrstränge 7', 7'' eine Wendel mit einem geringeren Außendurchmesser. Diese dienen zum Abtransport des Bohrgutes aus dem Schneidbereich der Schneideinrichtung 10', 10''. Da sich die beiden äußeren Bohrstränge 7', 7'' in entgegengesetztem Sinne drehen, haben auch die Förderwendeln 10', 10'' einen entgegengesetzten Drehsinn.At each Abtriebseinrichung 6 ', 6' ', 6' '' is a drill string 7 ', 7' ', 7' '' arranged. In these drill strings 7 ', 7' ', 7 '' 'are essentially tubular components, which at their lower, the indicated hole 8 facing Ends drill bits 9 ', 9' ', 9' '' and one each Cutting device 10 ', 10' ', 10' '' for cutting the soil exhibit. To the cutting devices 10 ', 10' ', 10' '' close to conveyor coils 11 ', 11' ', 11' '', which have at most one to three pitches. Override the drill helices 11 ', 11' 'of the two drill strings 7', 7 '' in Leading area the middle drill string 7 '' 'almost completely. In the amount of the conveyor coil 10 '' 'of the middle drill string 7 '' 'have the two outer drill strings 7', 7 '' one Spiral with a smaller outer diameter. These serve for removing the cuttings from the cutting area of Cutting device 10 ', 10' '. Because the two outer drill strings 7 ', 7' 'rotate in the opposite direction, too the conveyor coils 10 ', 10' 'an opposite direction of rotation.

Oberhalb der Förderwendeln 11', 11'', 11'''der drei Bohrstränge 7 befindet sich eine gemeinsame Führung 13 der drei Bohrstränge. Oberhalb der gemeinsamen Führung 13 sind an den Bohrsträngen 7', 7'', 7''' Paddel- oder Mischelemente 14 angebracht, welche das abgebohrte Bohrgut durchmischen. Diese Mischelemente 14 haben eine entsprechende Ausladung, um den Einwirkungsbereich jeweils zu übergreifen, da sie höhenmäßig übereinander angeordnet sind. Um den Wirkbereich der Paddel- oder Mischelemente 14 zu vergrößern, sind sie in einem bestimmten Winkel zur Horizontalebene angeordnet. Damit ist es möglich, eine Wand aus überschnittenen Mörtelsäulen herzustellen.Above the conveyor coils 11 ', 11' ', 11' '' of the three drill strings 7 is a common guide 13 of the three drill strings. Above the common guide 13 are on the drill strings 7 ', 7' ', 7' '' paddle or mixing elements 14 attached, which mix the drilled cuttings. These Mixing elements 14 have a corresponding projection to the To overlap each area of action, as they in terms of height are arranged one above the other. In order to reduce the effective range of the paddle or to increase mixing elements 14, they are in a particular Angle to the horizontal plane arranged. That's it possible to make a wall of overcut mortar columns.

Die Länge des Mischbereiches auf den Bohrsträngen 7', 7'', 7''' besitzt einen kleineren Anteil an der Gesamtlänge der Bohrstränge, um genügend Drehmomente für die Durchmischung des Bodens aufbringen zu können. Oberhalb der Paddelanordnung befindet sich wiederum eine gemeinsame Führung 15 für die drei Bohrstangen. Diese Führung 15 sitzt beweglich auf den drei Bohrsträngen 7', 7'', 7''' und kann sich entlang der Restlänge der drei Bohrstränge bewegen. Die bewegliche Fuhrung 15 besitzt eine trichterförmige Ausformung 16, mit welcher sie beim Abbohren der Bohrstränge in eine trichterförmige Aufnahme 17 eingreift, welche starr am unteren Ende des Bohrmastes 2 befestigt ist. Dadurch werden die drei Bohrstränge wahrend des gesamten Abbohrvorganges geführt und können von der vorgesehenen Bohrrichtung nicht abweichen.The length of the mixing area on the drill strings 7 ', 7' ', 7 '' 'has a smaller proportion of the total length of Drill strands to ensure sufficient torque for the mixing of the To raise soil. Located above the paddle assembly turn a common leadership 15 for the three Boring. This guide 15 sits movably on the three Drill strands 7 ', 7' ', 7' '' and can along the residual length move the three drill strings. The movable guide 15 has a funnel-shaped formation 16, with which they at Drilling the drill strings into a funnel-shaped receptacle 17 engages which rigidly attached to the lower end of the drill mast 2 is. As a result, the three drill strings during the Entire boring process and can be performed by the intended Drilling direction not deviate.

Die Zuführung der Suspension erfolgt entweder über den mittleren Bohrstrang 7''' oder über alle drei Bohrstränge 7', 7'', 7'''. Die Suspension wird dabei jeweils im Bereich der Spitzen 9', 9'',9''' dem Bohrgut zugeführt. Die Austrittsöffnungen für die Suspension befinden sich an dem mittleren Bohrstrang 7''' in dessen unterem Bereich. Alle Austrittsöffnungen sind gegen Verstopfung durch Bohrgut beim Abbohren geschützt und befinden sich in einem vor Bohrgut geschütztem Bereich.The supply of the suspension takes place either over the middle Drill string 7 '' 'or over all three drill strings 7', 7 '', 7 '' '. The suspension is in each case in the region of the tips 9 ', 9' ', 9' '' fed to the cuttings. The outlet openings for the suspension is at the middle drill string 7 '' ' in its lower part. All outlets are against Blockage by cuttings are protected and located during drilling in a protected from cuttings area.

Gemäß der vergrößerten Detaildarstellung von Fig. 3 ist die versetzte Anordnung des mittleren Bohrstranges 7''' gegenüber den beiden äußeren Bohrsträngen 7', 7'' näher dargestellt. Alle drei Bohrstränge 7 weisen eine gleich ausgebildete Schneideinrichtung 9 an ihrem bodenseitigen Ende sowie eine sich daran anschließende Förderwendel 11 mit etwa einer Ganghöhe auf. Aufgrund der überschneidenden Anordnung der Bohrradien ist der mittlere Bohrstrang 7''' um etwa eine Ganghöhe der Förderwendel 11 rückversetzt. Auf gleicher Höhe zu der Förderwendel 11''' des mittleren Bohrstranges 7''' sind an den beiden äußeren Bohrsträngen 7', 7'' jeweils eine durchmesserkleinere Förderwendel 18'' angeordnet, welche einen kollisionsfreien Rotationsantrieb zwischen den einzelnen Bohrsträngen 7 erlauben.According to the enlarged detail of Fig. 3 is the staggered arrangement of the middle drill string 7 '' 'opposite the two outer drill strings 7 ', 7' 'shown in more detail. All three drill strings 7 have an identically formed cutting device 9 at its bottom end and a to it subsequent conveyor coil 11 with about a pitch on. Due to the overlapping arrangement of Bohrradien is the middle drill string 7 '' 'by about one pitch of the conveyor coil 11 set back. At the same height to the conveyor spiral 11 '' 'of the middle drill string 7' '' are at the two outer Drill strings 7 ', 7' 'each have a smaller diameter conveyor coil 18 '' arranged, which a collision-free rotary drive allow between the individual drill strings 7.

Zur Versteifung der Anordnung der drei Bohrstränge 7 möglichst nahe an den Schneidkraft beaufschlagten Bohrstrangenden ist ein starres balkenförmiges Joch 20 vorgesehen. Dieses weist für die drei Bohrstränge 7 jeweils einen Lagerbereich 26 auf, in welchen die Bohrstränge 7 jeweils drehbar und axial fest gelagert sind. Trotz des Rückversatzes des mittleren Bohrstranges 7''' wird ein ausreichender Raum für die Förderwendel 11''' erfindungsgemäß dadurch erreicht, dass in einem mittleren Bereich des Joches 20 eine Verschränkung 22 vorgesehen ist. Die Verschränkung 22 besteht aus zwei angewinkelten Stegen, welche die beiden äußeren Lagerbereiche 26 mit dem mittleren Lagerbereich 26 verbinden. Auf diese Weise sind die eigentlichen Arbeitsbereiche der Bohrstränge 7 unterhalb des Jochs 20, welche den sogenannten Aufbereitungsbereich bilden, zumindest annähernd ausgeglichen. Der Aufbereitungsbereich ist maßgeblich für das Aufschneiden und Zerkleinern des Bodens sowie für eine erste Durchmischung des zerkleinerten Bodenmaterials mit Suspension. Durch die erfindungsgemäße Verschränkung 22 an dem Joch 20 kann die Aufbereitung des zerkleinerten Bodens in dem Aufbereitungsbereich an allen drei Bohrsträngen 7 weitgehend gleichmäßig erfolgen. Eine gleichmäßige Aufbereitung ist vorteilhaft für das Herstellen einer gleichmäßigen, hochqualitativen Gründungssäule oder Gründungswand. Zudem wird durch die Erfindung eine gleichmäßigere Drehmomentbelastung an allen drei Bohrsträngen sowie ein gleichmäßiger Werkzeugverschleiß erreicht.To stiffen the arrangement of the three drill strings 7 as possible is close to the cutting force acted on drill string ends a rigid bar-shaped yoke 20 is provided. This points for the three drill strings 7 each have a storage area 26, in which the drill strings 7 each rotatable and axially fixed are stored. Despite the return offset of the middle drill string 7 '' 'is a sufficient space for the conveyor coil 11 '' 'according to the invention achieved in that in a middle Region of the yoke 20 an entanglement 22 is provided is. The entanglement 22 consists of two angled webs, which the two outer bearing portions 26 with the middle Connect storage area 26. That way, the actual ones are Work areas of the drill string 7 below the Yokes 20, which form the so-called treatment area, at least approximately balanced. The treatment area is decisive for the slicing and chopping of the soil as well for a first mixing of the crushed soil material with suspension. Through the entanglement according to the invention 22 on the yoke 20, the processing of the crushed soil in the treatment area on all three drill strings 7 largely uniform. A uniform preparation is advantageous for producing a uniform, high-quality foundation pillar or foundation wall. In addition, will by the invention to a more uniform torque load All three drill strings and a uniform tool wear reached.

An der Verschränkung 22 des Jochs 20 sind Kanten 24 ausgebildet, welche entsprechend der Anwinkelung etwa in einem 45 Winkel zur Bohrstrangachse verlaufen. Diese gewinkelte Anordnung der Kanten 24 ist für ein Abscheren verbliebener Bodenmaterialstege zwischen den nebeneinander liegenden Bohrungen vorteilhaft. Die Anwinkelung der Kanten 24 erleichtert das Abscheren verbliebener Bodenstege und erleichtert somit insgesamt das Niederbringen der Bohrvorrichtung.At the entanglement 22 of the yoke 20 edges 24 are formed, which according to the Anwinkelung approximately in a 45 Angle to Bohrstrangachse run. This angled arrangement the edges 24 is for shearing remaining soil webs between the adjacent holes advantageous. The angling of the edges 24 facilitates shearing remaining floor bars and thus facilitates overall the lowering of the drilling device.

Oberhalb des Jochs 20 schließt sich der nur teilweise dargestellte Mischbereich an, welcher aus einer Anordnung von paddelförmigen Mischelementen an den Bohrsträngen 7 besteht. Zum Ausgleich der Verschränkung 22 am Joch 20 sind an den beiden äußeren Bohrsträngen 7', 7'' noch unmittelbar im Anschluss an das Joch 20 jeweils eine zusätzliche Förderwendel 19', 19'' mit etwa einer Ganghöhe ausgebildet. Der untere Teil der Bohrvorrichtung mit dem Joch 20 und den unteren Enden der einzelnen Bohrstränge 7 kann als ein separates Teil ausgebildet werden, welches über eine schematisch dargestellte Wellen-Nabenverbindung 28 axial auf die Bohrstränge 7 aufgeschoben und drehfest mit diesen verbunden werden kann.Above the yoke 20, the only partially closed Mixed range, which consists of an array of paddle-shaped Mixing elements on the drill strings 7 consists. To the Compensation of the entanglement 22 on the yoke 20 are at the two outer drill strings 7 ', 7' 'still immediately after the yoke 20 each have an additional conveying spiral 19 ', 19' ' formed with about a pitch. The lower part of the drilling device with the yoke 20 and the lower ends of each Drill string 7 can be formed as a separate part, which via a schematically illustrated shaft-hub connection 28 pushed axially on the drill string 7 and rotatably connected to these can.

Bei der dargestellten Erfindung handelt es sich um ein Verfahren zur Erstellung einer überschnittenen Bohrpfahlwand, beispielsweise aus Mörtelsäulen. Zunächst wird ein Voraushubgraben erstellt. Mit der erfindungsgemäßen Vorrichtung wird eine vorgegebene Tiefe abgebohrt, die sich in etwa an der Länge der Förderwendel 11', 11", 11''' und dem mit Mischelementen 14 besetzten Teil der Bohrstränge 7', 7'', 7''' orientiert. Das Abbohren geschieht in der Weise, dass kein Boden gefördert wird. Gleichzeitig oder nachfolgend wird an den Spitzen der drei Bohrstränge oder auch nur an der Spitze des mittleren Bohrstranges 7''' Suspension zugegeben und die Bohrvorrichtung 3 unter Drehen der Bohrstränge 7', 7", 7'' gezogen und nachfolgend wieder bis zur vorgegebenen Tiefe abgebohrt. Bei der Suspension handelt es sich um ein Wasser-Bindemittel-Gemisch, das selbstaushärtend ist. Dieser Vorgang wird mehrmals so oft wiederholt, bis die Suspension den Boden verflüssigt. Dabei wird gerade so viel Suspension zugegeben, als im Porenvolumen des Bodens aufgenommen werden kann. Der Mischvorgang wird so lange fortgesetzt, bis Suspension im Voraushubgraben austritt. In the illustrated invention is a method for creating a secant bored pile wall, for example from mortar columns. First, a pre-mine ditch created. With the device according to the invention is a predetermined depth drilled out, which is approximately at the length of Conveying spiral 11 ', 11 ", 11' '' and the mixing elements 14th occupied part of the drill string 7 ', 7' ', 7' '' oriented. The Boring happens in such a way that no soil is mined becomes. Simultaneously or subsequently, at the tips of the three drill strings or even just at the top of the middle Drill strings 7 '' 'suspension added and the drilling device 3 with turning the drill string 7 ', 7 ", 7' 'pulled and subsequently drilled again to the specified depth. In the Suspension is a water-binder mixture, which is self-curing. This process will be repeated several times repeatedly until the suspension liquefies the soil. there just as much suspension is added as in the pore volume of the soil can be absorbed. The mixing process will be like this long continued until suspension exits in the advance pit.

Diese Vorgehensweise wird bei den nachfolgenden Tiefenbereichen wiederholt, bis die gewünschte Endtiefe erreicht ist. Es handelt sich dabei um einen kontinuierlichen Bohr- und Mischvorgang. Beim Ziehen des Bohrgestänges kann Sand oder ein anderes Material eingeblasen werden, um eine spezielle Festigkeit der Gründungssäule zu erreichen.This procedure is used in the following depth ranges repeatedly until the desired final depth is reached. It This is a continuous drilling and mixing process. When pulling the drill string can be sand or another Material to be blown to a special strength to reach the foundation pillar.

Claims (10)

  1. Boring device with three juxtaposed boring strings (7) rotarily driveable, with each having a cutting device (10) at its ground-side end, whereby the ground-side end of a central boring string (7''') is arranged with a backwards offset with respect to the outer boring strings (7', 7'') and the boring radii of the cutting devices (10) of the adjacent boring strings (7) overlap and with at least one yoke (20), in which the boring strings (7) are rotarily mounted and are coupled together, whereby following onto the cutting device (10) there is arranged at the given boring string (7) a feed spiral (11), whereby a preparation area is provided below the yoke (20),
    characterized in that
    the feed spirals (11) of both outer boring strings (7) are designed with a smaller diameter at the level of the feed spiral (11) of the central boring string (7) and
    the yoke (20) has in the vicinity of the offset central boring string (7''') an angular displacement (22) in direction of the offset.
  2. Boring device according to claim 1,
    characterized in that
    a suspension supply for a settable suspension is provided on at least one of the boring strings (7).
  3. Boring device according to any one of the claims 1 or 2,
    characterized in that
    above the yoke (20) along the boring strings (7) are located mixing elements (14) for providing a mixing area.
  4. Boring device according to any one of the claims 1 to 3,
    characterized in that
    the feed spiral (11) includes no more than one pitch.
  5. Method of erecting a borehole in the ground, which is installed in the ground by the rotary driving and simultaneous lowering of three juxtaposed boring strings (7) with each having a cutting device (10) at its ground-side end, wherein the ground-side end of a central boring string (7''') is arranged with a backwards offset with respect to the outer boring strings (7', 7'') and
    the boring radii of the cutting devices (10) of the adjacent boring strings (7) overlap and the boring strings (7) are coupled together by at least one yoke (20), in which the boring strings (7) are rotarily mounted, whereby following onto the cutting device (10) there is arranged a feed spiral (11) at the given boring string (7), whereby a preparation area is provided below the yoke (20),
    characterized in that
    the feed spirals (11) of both outer boring strings (7) are designed with a smaller diameter at the level of the feed spiral (11) of the central boring string (7), and
    the respective preparation areas along the individual boring strings (7) below the yoke (20) are mutually compensated at least partly by an angular displacement (22) of the yoke (22) in direction of the offset of the central boring string (7''').
  6. Method according to claim 5,
    characterized in that
    in the preparation area below the yoke (20) soil material is crushed, and
    in a mixing area above the yoke (20) the crushed soil material is mixed with supplied suspension by means of mixing elements (14).
  7. Method according to any one of the claims 5 or 6,
    characterized in that
    the both outer boring strings (7', 7'') are driven in a contrary direction of rotation.
  8. Method according to any one of the claims 5 to 7,
    characterized in that
    the suspension supplying takes place via the central boring string (7''').
  9. Method according to any one of the claims 5 to 8,
    characterized in that
    for the mixing the boring strings (7) are moved upwards and are lowered again in determined time intervals.
  10. Method according to any one of the claims 5 to 9,
    characterized in that
    during drawing the boring strings (7) is blown sand or another material into the borehole.
EP03009634A 2002-05-02 2003-04-29 Drill and method for drilling the soil Expired - Lifetime EP1359257B1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE10219742 2002-05-02
DE10219742 2002-05-02
DE10301072A DE10301072A1 (en) 2002-05-02 2003-01-14 Drilling device and method for drilling a hole in the ground
DE10301072 2003-01-14

Publications (2)

Publication Number Publication Date
EP1359257A1 EP1359257A1 (en) 2003-11-05
EP1359257B1 true EP1359257B1 (en) 2005-07-06

Family

ID=29216856

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03009634A Expired - Lifetime EP1359257B1 (en) 2002-05-02 2003-04-29 Drill and method for drilling the soil

Country Status (6)

Country Link
EP (1) EP1359257B1 (en)
JP (1) JP3830460B2 (en)
AT (1) ATE299205T1 (en)
ES (1) ES2244857T3 (en)
HK (1) HK1058954A1 (en)
SG (1) SG102712A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2681006C1 (en) * 2016-11-18 2019-03-01 Китайский Университет Горного Дела И Технологии Automatic control system of a cutting machine and control method based on machine vision and sensors interaction

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Publication number Priority date Publication date Assignee Title
ITTO20050447A1 (en) * 2005-06-28 2006-12-29 Soilmec Spa EQUIPMENT AND MIXING METHOD ON THE SITE FOR DIAPHRAGM FORMATION.
CN105178297B (en) * 2015-08-09 2016-11-30 重庆晨宇机床制造有限公司 A kind of usage of octagon mixing pile wall telephone
KR101700848B1 (en) * 2016-04-14 2017-02-01 조준열 Auger pile
CN106049474A (en) * 2016-06-29 2016-10-26 滕彦斐 Concave circular cross drilling machine
CN106049475A (en) * 2016-06-29 2016-10-26 滕彦斐 Rectangular drilling machine
CN108894725A (en) * 2018-08-07 2018-11-27 江西基良工程机械设备有限公司 Drilling machine for the continuous interlocking pile barricade of foundation pit
CN111962609A (en) * 2020-08-27 2020-11-20 王旭 Movable underground water filling equipment based on ecological restoration

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JPS55159017A (en) * 1979-05-25 1980-12-10 Kawasaki Heavy Ind Ltd Improving apparatus for soft ground at sea bed
JPS5850217A (en) * 1981-09-22 1983-03-24 Asuku Kenkyusho:Kk Drilling mixer
US4909675A (en) 1988-08-24 1990-03-20 Osamu Taki In situ reinforced structural diaphragm walls and methods of manufacturing
DE4219150C1 (en) 1992-06-11 1993-09-23 Bauer Spezialtiefbau Gmbh, 86529 Schrobenhausen, De Underground mortar column prodn. - by drilling with auger through which hardenable suspension is fed
US5417522A (en) * 1993-09-23 1995-05-23 S. M. W. Seiko Soil fragmentation members and multiple lateral support structures for improved soil mixing and efficient boring for use on multi-shaft auger soil mixing apparatus
EP0678628B1 (en) 1993-10-22 2002-02-06 Chemical Grouting Company Ltd. Multi-shaft excavating device
JPH0827772A (en) * 1994-07-20 1996-01-30 Nippon Concrete Ind Co Ltd Mixing and stirring device for ground improvement
JP3156043B2 (en) * 1997-04-11 2001-04-16 株式会社竹中土木 Three-axis synchronization device for ground improvement, three-axis mixing processor and casing pipe type ground improvement device using the same

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2681006C1 (en) * 2016-11-18 2019-03-01 Китайский Университет Горного Дела И Технологии Automatic control system of a cutting machine and control method based on machine vision and sensors interaction

Also Published As

Publication number Publication date
ATE299205T1 (en) 2005-07-15
SG102712A1 (en) 2004-03-26
HK1058954A1 (en) 2004-06-11
JP3830460B2 (en) 2006-10-04
EP1359257A1 (en) 2003-11-05
JP2003328386A (en) 2003-11-19
ES2244857T3 (en) 2005-12-16

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