EP1564367A1 - Earth displacement drill - Google Patents
Earth displacement drill Download PDFInfo
- Publication number
- EP1564367A1 EP1564367A1 EP04003435A EP04003435A EP1564367A1 EP 1564367 A1 EP1564367 A1 EP 1564367A1 EP 04003435 A EP04003435 A EP 04003435A EP 04003435 A EP04003435 A EP 04003435A EP 1564367 A1 EP1564367 A1 EP 1564367A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- drill
- mixing element
- drilling
- drilling fluid
- soil displacement
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000006073 displacement reaction Methods 0.000 title claims abstract description 18
- 238000000034 method Methods 0.000 claims abstract description 8
- 238000005553 drilling Methods 0.000 claims description 58
- 239000012530 fluid Substances 0.000 claims description 32
- 239000002689 soil Substances 0.000 claims description 28
- 239000000203 mixture Substances 0.000 claims description 10
- 238000009933 burial Methods 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract 1
- 239000000463 material Substances 0.000 description 15
- 239000011148 porous material Substances 0.000 description 3
- 239000000654 additive Substances 0.000 description 2
- 230000001050 lubricating effect Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000001603 reducing effect Effects 0.000 description 1
- 230000003716 rejuvenation Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/44—Bits with helical conveying portion, e.g. screw type bits; Augers with leading portion or with detachable parts
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- E21B21/06—Arrangements for treating drilling fluids outside the borehole
- E21B21/062—Arrangements for treating drilling fluids outside the borehole by mixing components
-
- 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
- E02D5/72—Pile shoes
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices, or the like
- E21B33/138—Plastering the borehole wall; Injecting into the formation
Definitions
- the present invention relates to a Erdverdrfitungsbohrer with a Drill tube and a arranged at the end of the drill head, wherein the Radius of the drill pipe is less than the largest radius of the drill head.
- Such Erdverdrfitungsbohrer are basically known (see DE-A-35 01 439). When using such Erddrdrfitungsbohrers is this driven under turning into the ground, due to the larger Radius of the drill head between the resulting drill channel and the drill pipe creates an annulus.
- a drilling fluid is introduced into the drill channel. On such drilling fluid may be, for example, water but is common from a mixture of cement and mortar, with other additives Application can be found.
- the drill pipe can be up to a desired Depth to be drilled. After creating the Bohrkanals this can with Concrete filled to form a pile.
- Drilling channels are drilled deeper and deeper. Also, due to this Requirements of the cross section of the drill pipe and the drill head always greater.
- the desired pile depth can often not be achieved be because the drilling fluid into a porous or coarse-grained soil layer disappears or because of the annulus, which is between drill pipe and Drilling channel has formed, filled by burbling soil material so that the lubricating effect of the drilling fluid is eliminated. hereby increases the friction on the drill pipe and that for further drilling Required torque becomes so great that the drilling process stops comes, although the desired drilling depth has not yet been reached.
- One solution to this problem would be to increase the amount applied Torque. However, in this case, the thickness of the drill pipe would be dramatic must be increased, so that an economic use of such Earth displacement drill is out of the question.
- mixing element ensures that soil material and mix drilling fluid particularly well and intensively with each other. As a result, friction is significantly reduced, so that on the one hand with larger Diameters can be drilled and on the other hand essential larger drilling depths are achieved.
- the mixing element be dimensioned so that it does not project radially beyond the drill head and in particular radially outward approximately to the largest radius of the drill head extends. In this way it is ensured that the Mixing element does not increase the drilling channel undesirable. By a radial extent to about the largest radius of the drill head is ensured that a thorough mixing of drilling fluid and soil material takes place over the entire cross section of the annulus.
- the mixing element arranged directly above the drill head.
- Such an embodiment is particularly advantageous if the drilling fluid through a or more openings in the area of the drill head into the borehole exit. In this way, the mixing can be immediately above of the drill head.
- the mixing element designed so that between this and the drill pipe a particular closed volume is included.
- it Mixing element designed as a body, creating a particularly good Mixing is achieved.
- the mixing element at least one wedge surface, seen in cross-section with the Wall of a drilling channel formed by the drill head a tapered Area forms.
- this particularly advantageous embodiment ensures the wedge surface that when turning the drill pipe, the Mixture of drilling fluid and soil material in the tapered Area is pushed, the mixture subsequently by the rotary motion the wedge surface is entered into the wall of the drilling channel.
- the mixing element have a convex outer surface, in particular symmetrical is trained.
- the mixing element can basically be arranged parallel to the drilling axis However, can also be arranged obliquely on the drill pipe, so that a through the central axis of the drill pipe extending plane with the Longitudinal axis of the mixing element forms an angle.
- the longitudinal extent of the mixing element can vary. Good results have been shown when the mixing element about one and a half to two and a half times as long as the diameter of the drill pipe is.
- a method according to the invention for producing a borehole with a Erdverdrfitungsbohrer of the type described above is the drill drilled into the subsurface, taking drilling fluid into the annulus is introduced, which arises between the borehole and the drill channel, wherein the drilling fluid is mixed above the drill head.
- the drilling fluid is mixed above the drill head.
- the drill pipe drills the drilling fluid and soil material mixed above the drill head, whereby the above-described Benefits are achieved.
- the Erdverdrfitungsbohrer shown in Fig. 1 has a circular cylindrical Drill tube 10, welded to the lower end of a drill head 12 is.
- the illustrated enlarged in Figure 4 drill head 12 has its rear end an annular shaft portion 14th on, in which the front end of the drill pipe 10 is inserted, whereupon then drill pipe 10 and drill head 12 by means of a welded joint 16 can be connected to each other.
- a cone-shaped tip section closes 18, which is formed integrally with the shaft portion 14.
- Both in the region of the shaft portion 14 as well as the tip portion 18 are provided a plurality of helical ribs 20, 21, 22 and 23, wherein the ribs 20 and 21 project radially from the shaft portion 14 and the ribs 22 and 23 in the axial direction of the tip portion 18th protrude. All of the ribs are spaced apart teeth 24 provided, which point in the axial direction of the drill head 12, with the Drilling direction X (Fig. 1) matches.
- the entire drill head 12 is integrally formed.
- the Drill head 12 as well as the drill pipe 10 are made of steel.
- the radius of the drill pipe 10 is smaller than the largest radius of the drill head 12, so that when screwing the ErdverdrDeutschungsbohrers in soil material between the resulting Drill and the drill pipe 10, an annulus 30 is formed.
- Fig. 1 illustrates Furthermore, that both the resulting in the region of the drill head 12 Borehole 32 as well as the annular channel 30 with a mixture of Drilling fluid and particles of the soil material are filled.
- the drilling fluid is via a arranged in the interior of the drill pipe 10 pipe 34th guided in the region of the foremost end of the drill head 12 and occurs from there via radial outlet channels 36 into the borehole 32.
- the leaking drilling fluid 38 mixes with particles of the soil material and fills the wellbore 32 as well as the wellbore 30.
- a mixing element 40 is provided which extends in the longitudinal direction X. of the drill pipe and the radially not over the drill head 12th protrudes, but radially outward to about the largest radius of the drill head 12 extends.
- the mixing element 40 is a groove-shaped component, whose radius is smaller than that of the drill pipe 10.
- the mixing element 40 is in the illustrated embodiment of the outer jacket the drill pipe 10 welded and at its top and bottom closed, so that between the mixing element 40 and the Drill tube 10 is enclosed a closed volume.
- Fig. 3b shows another embodiment of a mixing element 40 '.
- the mixing element 40 ' by an angular Part formed, whose two legs are the same length and enclose an angle of about 115 ° with each other.
- the position of the Mixing element 40 'on the drill pipe 10 is the same as that of the mixing element 40th
- the mixing element according to the invention either have a convex outer circumferential surface (Fig. 3a) or the mixing element may have two converging outer surfaces possess ( Figure 3b).
- the mixing element has at its Outside a surface 42 and 42 ', which is approximately tangential to the Outer jacket of the drill pipe 10 extends, and which serves as a wedge surface, there it with the wall of the drill hole 30 formed by the drill head forms a tapered region 44.
- the mixing element 40 ensures intimate mixing of drilling fluid and soil material.
- the mixing element 40 ensures that the in the annular space 30th contained mixture pressed or registered in the wall of the drill channel is, by the wedge surface 42, the mixture located in the area 44 sweeps into the wall of the Bohrkanals. This will be in the surrounding pores 46 sealed pores and the Wall of the annular space 30 and the drilling channel is plastered, so to speak and thereby sealed and stabilized.
- the Drilling channel has a stabilized wall portion 48, the same time sealed the surrounding soil, leaving the annulus above the drill head 12 is filled with drilling fluid, without this in the surrounding soil penetrates and seeps away. This is on the one hand ensures that the drill channel remains stable and does not collapse. On the other hand, it is ensured that the friction reducing effect of Drilling fluid maintained over the entire length of the drill pipe remains, which significantly increases the torque required for drilling is reduced. At the same time, the wall thickness of the drill pipe 12 within stay reasonable limits.
- the mixing element 40, 40 ' is also a certain imbalance, which imposes a certain rolling motion on the drill, which itself has a positive effect during drilling.
- the mixing element are arranged obliquely on the outer circumference of the drill pipe.
- Both drill pipe and mixing element can also be made of plastic consist.
- the mixing element can be curved in the axial direction or be formed curved. Furthermore, it is not absolutely necessary that the drilling fluid passes through the interior of the drill head into the wellbore 32 is injected. This could also be done through the annulus 30.
Abstract
Description
Die vorliegende Erfindung betrifft einen Erdverdrängungsbohrer mit einem Bohrrohr und einem an dessen Ende angeordneten Bohrkopf, wobei der Radius des Bohrrohres geringer als der größte Radius des Bohrkopfes ist.The present invention relates to a Erdverdrängungsbohrer with a Drill tube and a arranged at the end of the drill head, wherein the Radius of the drill pipe is less than the largest radius of the drill head.
Derartige Erdverdrängungsbohrer sind grundsätzlich bekannt (vgl. DE-A-35 01 439). Bei Verwendung eines solchen Erdverdrängungsbohrers wird dieser unter Drehen in das Erdreich getrieben, wobei aufgrund des größeren Radius des Bohrkopfes zwischen dem entstehenden Bohrkanal und dem Bohrrohr ein Ringraum entsteht. Zum Bohren wird üblicherweise im Bereich des Bohrkopfes ein Bohrfluid in den Bohrkanal eingebracht. Ein solches Bohrfluid kann beispielsweise Wasser sein, besteht jedoch häufig aus einer Mischung aus Zement und Mörtel, wobei auch weitere Zuschlagsstoffe Anwendung finden können.Such Erdverdrängungsbohrer are basically known (see DE-A-35 01 439). When using such Erddrdrängungsbohrers is this driven under turning into the ground, due to the larger Radius of the drill head between the resulting drill channel and the drill pipe creates an annulus. For drilling is usually in In the area of the drill head, a drilling fluid is introduced into the drill channel. On such drilling fluid may be, for example, water but is common from a mixture of cement and mortar, with other additives Application can be found.
Durch die schmierende Wirkung von Bohrfluid, das mit Bestandteilen des Bodenmaterials vermengt ist, kann das Bohrrohr bis zu einer gewünschten Tiefe gebohrt werden. Nach Erstellen des Bohrkanals kann dieser mit Beton gefüllt werden, um einen Pfahl zu bilden.Due to the lubricating effect of drilling fluid containing components of the Ground material is mixed, the drill pipe can be up to a desired Depth to be drilled. After creating the Bohrkanals this can with Concrete filled to form a pile.
Durch die immer mehr zunehmenden Belastungen auf derartige Pfähle und den Wunsch nach setzungsfreien Gründungen, müssen heutzutage Bohrkanäle zunehmend tiefer gebohrt werden. Auch wird aufgrund dieser Anforderungen der Querschnitt des Bohrrohres und des Bohrkopfes immer größer. Die gewünschte Pfahltiefe kann jedoch oft nicht erreicht werden, weil das Bohrfluid in eine poröse bzw. grobkörnige Bodenschicht verschwindet oder weil der Ringraum, der sich zwischen Bohrrohr und Bohrkanal gebildet hat, von einbrechendem Bodenmaterial zugeschüttet wird, so dass die schmierende Wirkung des Bohrfluids entfällt. Hierdurch nimmt die Reibung auf das Bohrrohr zu und das für ein Weiterbohren erforderliche Drehmoment wird so groß, dass der Bohrprozess zum Erliegen kommt, obwohl die gewünschte Bohrtiefe noch nicht erreicht wurde. Eine Lösung dieses Problems wäre zwar ein Erhöhen des aufgebrachten Drehmomentes. Jedoch würde hierbei die Dicke des Bohrrohrs drastisch erhöht werden müssen, so dass ein ökonomischer Einsatz eines solchen Erdverdrängungsbohrers nicht in Frage kommt.Due to the ever-increasing loads on such piles and the desire for settlement-free foundations, must nowadays Drilling channels are drilled deeper and deeper. Also, due to this Requirements of the cross section of the drill pipe and the drill head always greater. However, the desired pile depth can often not be achieved be because the drilling fluid into a porous or coarse-grained soil layer disappears or because of the annulus, which is between drill pipe and Drilling channel has formed, filled by burbling soil material so that the lubricating effect of the drilling fluid is eliminated. hereby increases the friction on the drill pipe and that for further drilling Required torque becomes so great that the drilling process stops comes, although the desired drilling depth has not yet been reached. One solution to this problem would be to increase the amount applied Torque. However, in this case, the thickness of the drill pipe would be dramatic must be increased, so that an economic use of such Earth displacement drill is out of the question.
Es ist die Aufgabe der vorliegenden Erfindung, einen Erdverdrängungsbohrer und ein Verfahren zum Erstellen eines Bohrloches zu schaffen, mit denen es möglich ist, Bohrkanäle mit größerer Tiefe und/oder größerem Durchmesser zu schaffen.It is the object of the present invention to provide a soil displacement drill and to provide a method of creating a well with which it is possible to drill channels with greater depth and / or larger Create diameter.
Die Lösung dieser Aufgabe erfolgt durch die Merkmale der unabhängigen Ansprüche und insbesondere dadurch, dass bei einem Erdverdrängungsbohrer der eingangs genannten Art am Außenumfang des Bohrrohres zumindest ein sich in dessen Längsrichtung erstreckendes Mischelement vorgesehen ist.The solution to this problem is provided by the features of the independent Claims and in particular in that in a Erdverdrängungsdrhrer of the type mentioned on the outer circumference of the drill pipe at least one mixing element extending in its longitudinal direction is provided.
Durch Einbringen von Bohrfluid in den Bereich des Bohrkopfes und/oder des Ringraums zwischen Bohrrohr und Wandung des Bohrkanals vermengen sich Teile von Bodenmaterial mit dem Bohrfluid, wobei das erfindungsgemäß vorgesehene Mischelement dafür sorgt, dass sich Bodenmaterial und Bohrfluid besonders gut und intensiv miteinander vermischen. Hierdurch wird Reibung deutlich reduziert, so dass einerseits mit größeren Durchmessern gebohrt werden kann und andererseits wesentlich größere Bohrtiefen erreicht werden.By introducing drilling fluid into the area of the drill head and / or of the annulus between drill pipe and wall of the drilling channel Parts of soil material with the drilling fluid, according to the invention provided mixing element ensures that soil material and mix drilling fluid particularly well and intensively with each other. As a result, friction is significantly reduced, so that on the one hand with larger Diameters can be drilled and on the other hand essential larger drilling depths are achieved.
Vorteilhafte Ausführungsformen der Erfindung sind in der Beschreibung, der Zeichnung und den Unteransprüchen beschrieben.Advantageous embodiments of the invention are described in the description, the drawing and the dependent claims described.
Nach einer ersten vorteilhaften Ausführungsform kann das Mischelement so dimensioniert sein, dass es radial nicht über den Bohrkopf vorsteht und sich insbesondere radial nach außen etwa bis zum größten Radius des Bohrkopfes erstreckt. Auf diese Weise ist sichergestellt, dass das Mischelement den Bohrkanal nicht unerwünscht vergrößert. Durch eine radiale Erstreckung bis etwa zum größten Radius des Bohrkopfes wird sichergestellt, dass eine Durchmischung von Bohrfluid und Bodenmaterial über den gesamten Querschnitt des Ringraums erfolgt.According to a first advantageous embodiment, the mixing element be dimensioned so that it does not project radially beyond the drill head and in particular radially outward approximately to the largest radius of the drill head extends. In this way it is ensured that the Mixing element does not increase the drilling channel undesirable. By a radial extent to about the largest radius of the drill head is ensured that a thorough mixing of drilling fluid and soil material takes place over the entire cross section of the annulus.
Nach einer weiteren vorteilhaften Ausführungsform ist das Mischelement unmittelbar oberhalb des Bohrkopfes angeordnet. Eine solche Ausführungsform ist besonders dann von Vorteil, wenn das Bohrfluid durch eine oder mehrere Öffnungen im Bereich des Bohrkopfes in das Bohrloch austritt. Auf diese Weise kann die Durchmischung unmittelbar oberhalb des Bohrkopfes erfolgen.According to a further advantageous embodiment, the mixing element arranged directly above the drill head. Such an embodiment is particularly advantageous if the drilling fluid through a or more openings in the area of the drill head into the borehole exit. In this way, the mixing can be immediately above of the drill head.
Nach einer weiteren vorteilhaften Ausführungsform ist das Mischelement so ausgebildet, dass zwischen diesem und dem Bohrrohr ein insbesondere geschlossenes Volumen eingeschlossen ist. Mit anderen Worten ist das Mischelement als Körper ausgebildet, wodurch eine besonders gute Durchmischung erzielt wird. According to a further advantageous embodiment, the mixing element designed so that between this and the drill pipe a particular closed volume is included. In other words that's it Mixing element designed as a body, creating a particularly good Mixing is achieved.
Nach einer weiteren vorteilhaften Ausführungsform weist das Mischelement zumindest eine Keilfläche auf, die im Querschnitt gesehen mit der Wand eines von dem Bohrkopf gebildeten Bohrkanals einen sich verjüngenden Bereich bildet. Bei dieser besonders vorteilhaften Ausführungsform sorgt die Keilfläche dafür, dass bei Drehung des Bohrrohres die Mischung aus Bohrfluid und Bodenmaterial in den sich verjüngenden Bereich gedrängt wird, wobei die Mischung anschließend durch die Drehbewegung der Keilfläche in die Wand des Bohrkanals eingetragen wird. Hierdurch kann gewissermaßen ein Verputzen des Bohrkanals erreicht werden, indem die von dem Mischelement durchmengte Mischung aus Bohrfluid und Bodenmaterial in die Wandung des Bohrkanals eingepresst wird. Hierdurch wird ein äußerst stabiler Bohrkanal erhalten, der nicht einbricht und der verhindert, dass Bohrfluid in den umgebenden Boden austritt.According to a further advantageous embodiment, the mixing element at least one wedge surface, seen in cross-section with the Wall of a drilling channel formed by the drill head a tapered Area forms. In this particularly advantageous embodiment ensures the wedge surface that when turning the drill pipe, the Mixture of drilling fluid and soil material in the tapered Area is pushed, the mixture subsequently by the rotary motion the wedge surface is entered into the wall of the drilling channel. As a result, it is possible to achieve a plastering of the drilling channel be characterized by the mixed by the mixing element mixture of Drilling fluid and soil material pressed into the wall of the drilling channel becomes. This will provide a very stable bore channel that will not breaks down and prevents drilling fluid into the surrounding soil exit.
Nach einer weiteren vorteilhaften Ausführungsform kann das Mischelement eine konvexe Außenfläche aufweisen, die insbesondere symmetrisch ausgebildet ist. Hierdurch wird ein besonders gutes Einbringen des gemischten Materials in die Wandung des Bohrkanals erreicht. Besonders gute Ergebnisse haben sich dadurch ergeben, dass an dem Mischelement zumindest eine Außenfläche vorgesehen wurde, die etwa tangential zu dem Bohrrohr angeordnet war.According to a further advantageous embodiment, the mixing element have a convex outer surface, in particular symmetrical is trained. As a result, a particularly good introduction of the mixed Materials reached in the wall of the drilling channel. Especially good results have resulted from the fact that on the mixing element at least one outer surface has been provided which is approximately tangential to the drill pipe was arranged.
Das Mischelement kann grundsätzlich parallel zur Bohrachse angeordnet sein, kann jedoch auch schräg an dem Bohrrohr angeordnet sein, so dass eine durch die Mittelachse des Bohrrohres verlaufende Ebene mit der Längsachse des Mischelements einen Winkel bildet. The mixing element can basically be arranged parallel to the drilling axis However, can also be arranged obliquely on the drill pipe, so that a through the central axis of the drill pipe extending plane with the Longitudinal axis of the mixing element forms an angle.
Die Längserstreckung des Mischelementes kann variieren. Gute Ergebnisse haben sich gezeigt, wenn das Mischelement etwa eineinhalb bis zweieinhalbmal so lang wie der Durchmesser des Bohrrohres ist.The longitudinal extent of the mixing element can vary. Good results have been shown when the mixing element about one and a half to two and a half times as long as the diameter of the drill pipe is.
Bei einem erfindungsgemäßen Verfahren zum Herstellen eines Bohrloches mit einem Erdverdrängungsbohrer der eingangs beschriebenen Art wird der Bohrer in den Untergrund gebohrt, wobei Bohrfluid in den Ringraum eingebracht wird, der zwischen Bohrloch und Bohrkanal entsteht, wobei das Bohrfluid oberhalb des Bohrkopfes vermischt wird. Bevorzugt erfolgt das Einbringen des Bohrfluids über die Spitze des Bohrkopfes, so dass dieses zunächst in das vom Bohrkopf gebildete Bohrloch austritt und anschließend den Ringraum zwischen Bohrrohr und Bohrkanal füllt. Durch Drehen des Bohrrohres wird das Bohrfluid und das Bodenmaterial oberhalb des Bohrkopfes vermischt, wodurch die eingangs beschriebenen Vorteile erzielt werden.In a method according to the invention for producing a borehole with a Erdverdrängungsbohrer of the type described above is the drill drilled into the subsurface, taking drilling fluid into the annulus is introduced, which arises between the borehole and the drill channel, wherein the drilling fluid is mixed above the drill head. Preferably takes place the introduction of the drilling fluid over the tip of the drill head, so that this first emerges in the wellbore formed by the drill hole and then fills the annulus between drill pipe and drill channel. Turning the drill pipe drills the drilling fluid and soil material mixed above the drill head, whereby the above-described Benefits are achieved.
Nachfolgend wird die vorliegende Erfindung rein beispielhaft anhand vorteilhafter Ausführungsformen unter Bezugnahme auf die beigefügten Zeichnungen beschrieben. Es zeigen:
- Fig. 1
- einen Längsschnitt durch einen in einem Bohrkanal angeordneten Erdverdrängungsbohrer;
- Fig. 2
- einen Schnitt entlang der Linie II-II von Fig. 1;
- Fig. 3a und 3b
- eine dem Detail III von Fig. 2 entsprechende Schnittansicht zweier verschiedener Ausführungsformen; und
- Fig. 4
- eine Seitenansicht des Bohrkopfes von Fig. 1.
- Fig. 1
- a longitudinal section through an arranged in a drill hole Erdverdrängungsbohrer;
- Fig. 2
- a section along the line II-II of Fig. 1;
- Fig. 3a and 3b
- a detail III of Figure 2 corresponding sectional view of two different embodiments. and
- Fig. 4
- a side view of the drill head of Fig. 1st
Der in Fig. 1 dargestellte Erdverdrängungsbohrer weist ein kreiszylindrisches
Bohrrohr 10 auf, an dessen unterem Ende ein Bohrkopf 12 angeschweißt
ist. Der in Fig.4 vergrößert dargestellte Bohrkopf 12 weist an
seinem rückwärtigen Ende einen kreisringförmigen Schaftabschnitt 14
auf, in den das vorderseitige Ende des Bohrrohres 10 gesteckt wird, woraufhin
dann Bohrrohr 10 und Bohrkopf 12 mittels einer Schweißverbindung
16 miteinander verbunden werden können.The Erdverdrängungsbohrer shown in Fig. 1 has a circular
An den Schaftabschnitt 14 schließt sich ein konusförmiger Spitzenabschnitt
18 an, der mit dem Schaftabschnitt 14 einstückig ausgebildet ist.
Sowohl im Bereich des Schaftabschnitts 14 wie auch des Spitzenabschnittes
18 sind mehrere wendelförmige Rippen 20, 21, 22 und 23 vorgesehen,
wobei die Rippen 20 und 21 radial vom Schaftabschnitt 14 vorstehen und
die Rippen 22 und 23 in Axialrichtung von dem Spitzenabschnitt 18
vorstehen. An sämtlichen Rippen sind voneinander beabstandete Zähne
24 vorgesehen, die in Axialrichtung des Bohrkopfes 12 weisen, die mit der
Bohrrichtung X (Fig. 1) übereinstimmt.At the
Wie Fig. 1 zeigt, ist der gesamte Bohrkopf 12 einstückig ausgebildet. Der
Bohrkopf 12 wie auch das Bohrrohr 10 bestehen aus Stahl.As shown in FIG. 1, the
Wie Fig. 1 ferner verdeutlicht, ist der Radius des Bohrrohres 10 kleiner als
der größte Radius des Bohrkopfes 12, so dass beim Eindrehen des Erdverdrängungsbohrers
in Bodenmaterial zwischen dem entstandenen
Bohrkanal und dem Bohrrohr 10 ein Ringraum 30 entsteht. Fig. 1 verdeutlicht
ferner, dass sowohl das im Bereich des Bohrkopfes 12 entstehende
Bohrloch 32 wie auch der Ringkanal 30 mit einem Gemenge aus
Bohrfluid und Partikeln des Bodenmaterials gefüllt sind. Das Bohrfluid
wird über eine im Inneren des Bohrrohres 10 angeordnete Rohrleitung 34
in den Bereich des vordersten Endes des Bohrkopfes 12 geführt und tritt
von dort über radiale Austrittskanäle 36 in das Bohrloch 32 aus. Das
austretende Bohrfluid 38 vermengt sich mit Partikeln des Bodenmaterials
und füllt das Bohrloch 32 wie auch den Bohrkanal 30.As Fig. 1 further illustrates, the radius of the
Am Außenumfang des Bohrrohres 10 ist unmittelbar oberhalb des Bohrkopfes
12 ein Mischelement 40 vorgesehen, das sich in Längsrichtung X
des Bohrrohres erstreckt und das radial nicht über den Bohrkopf 12
vorsteht, sondern sich radial nach außen etwa bis zum größten Radius
des Bohrkopfes 12 erstreckt. Bei dem in den Fig. 1, 2 und 3a dargestellten
Ausführungsbeispiel ist das Mischelement 40 ein rinnenförmiges Bauteil,
dessen Radius kleiner als derjenige des Bohrrohres 10 ist. Das Mischelement
40 ist bei dem dargestellten Ausführungsbeispiel an den Außenmantel
des Bohrrohres 10 geschweißt und an seiner Oberseite wie auch Unterseite
geschlossen, so dass zwischen dem Mischelement 40 und dem
Bohrrohr 10 ein geschlossenes Volumen eingeschlossen ist.On the outer circumference of the
Fig. 3b zeigt eine weitere Ausführungsform eines Mischelementes 40'. Bei
diesem Ausführungsbeispiel ist das Mischelement 40' durch ein winkelförmiges
Bauteil gebildet, dessen beide Schenkel gleich lang sind und
einen Winkel von etwa 115° miteinander einschließen. Die Position des
Mischelementes 40' an dem Bohrrohr 10 ist die gleiche wie die des Mischelementes
40.Fig. 3b shows another embodiment of a mixing
Wie die Fig. 3a und 3b verdeutlichen, kann das erfindungsgemäße Mischelement
entweder eine konvexe Außenmantelfläche aufweisen (Fig. 3a)
oder das Mischelement kann zwei aufeinander zulaufende Außenflächen
besitzen (Fig. 3b). In beiden Fällen besitzt das Mischelement an seiner
Außenseite eine Fläche 42 bzw. 42', die annähernd tangential zu dem
Außenmantel des Bohrrohres 10 verläuft, und die als Keilfläche dient, da
sie mit der Wand des von dem Bohrkopf gebildeten Bohrkanals 30 einen
sich verjüngenden Bereich 44 bildet. Durch diese Keilflächen wird bei
einer Rotation des Erdverdrängungsbohrers das aus Bohrfluid und Bodenmaterial
bestehende Gemenge einerseits im Ringraum 30 vermischt
und andererseits in die Wand des Bohrkanals eingetragen, so dass diese
stabilisiert wird, was nachfolgend näher beschrieben wird.As FIGS. 3 a and 3 b illustrate, the mixing element according to the invention
either have a convex outer circumferential surface (Fig. 3a)
or the mixing element may have two converging outer surfaces
possess (Figure 3b). In both cases, the mixing element has at its
Outside a
Zum Erstellen eines Bohrloches mit dem oben beschriebenen Erdverdrängungsbohrer
wird dieser in Richtung X in den Boden abgesenkt und dabei
in Pfeilrichtung gedreht (Fig. 2 und 3). Gleichzeitig wird Bohrfluid 38
durch eine (nicht dargestellte) Pumpanordnung durch die Rohrleitung 34
geführt, so dass dieses aus dem Austrittskanal 36 an der Spitze des Bohrkopfes
12 in das Bohrloch 32 austritt. Die Form des mit den Zähnen 24
versehenen Bohrkopfes 12 sorgt dafür, dass sich das Bohrfluid 38 bereits
etwas mit Teilen des Bodenmaterials vermischt.To create a borehole with the Earth Displacement Drill described above
this is lowered in the direction of X in the ground and thereby
rotated in the direction of the arrow (Figures 2 and 3). At the same
Bei weiter fortschreitendem Bohrvorgang füllt sich auch der Ringraum 30
oberhalb des Bohrkopfes 12, wobei in diesem Bereich das Mischelement
40 für eine innige Vermischung von Bohrfluid und Bodenmaterial sorgt.
Gleichzeitig sorgt das Mischelement 40 dafür, dass das im Ringraum 30
befindliche Gemenge in die Wand des Bohrkanals eingepresst bzw. eingetragen
wird, indem die Keilfläche 42 das im Bereich 44 befindliche Gemenge
in die Wand des Bohrkanals einstreicht. Hierdurch werden die im
umgebenden Bodenmaterial vorhandenen Poren 46 versiegelt und die
Wand des Ringraums 30 bzw. des Bohrkanals wird sozusagen verputzt
und dadurch versiegelt und stabilisiert. Insbesondere bei Verwendung
entsprechender Zuschlagstoffe wird besonders gut erreicht, dass der
Bohrkanal einen stabilisierten Wandabschnitt 48 aufweist, der gleichzeitig
das umgebende Bodenmaterial versiegelt, so dass der Ringraum oberhalb
des Bohrkopfes 12 mit Bohrfluid gefüllt bleibt, ohne dass dieses in den
umgebenden Boden eindringt und versickert. Hierdurch ist einerseits
sichergestellt, dass der Bohrkanal stabil bleibt und nicht zusammenfällt.
Andererseits ist gewährleistet, dass die reibungsreduzierende Wirkung des
Bohrfluides über die gesamte Länge des Bohrrohres aufrechterhalten
bleibt, wodurch das zum Bohren erforderliche Drehmoment erheblich
reduziert ist. Gleichzeitig kann die Wanddicke des Bohrrohres 12 innerhalb
vernünftiger Grenzen bleiben.As the drilling progresses, so does the
Durch das Mischelement 40, 40' ist ferner eine gewisse Unwucht vorhanden,
die dem Bohrer eine gewisse Schlingerbewegung auferlegt, die sich
beim Bohren positiv auswirkt.By the mixing
Insbesondere für größere Rohrdurchmesser können auch mehrere Mischelemente
40 bzw. 40' vorgesehen werden. Auch kann das Mischelement
schräg am Außenumfang des Bohrrohres angeordnet werden. Weiterhin
können sowohl Bohrrohr wie auch Mischelement auch aus Kunststoff
bestehen. Auch kann das Mischelement in Axialrichtung gekrümmt oder
geschwungen ausgebildet sein. Weiterhin ist es nicht unbedingt erforderlich,
dass das Bohrfluid durch das Innere des Bohrkopfes in das Bohrloch
32 injiziert wird. Dies könnte auch durch den Ringraum 30 erfolgen. In particular for larger pipe diameters, several mixing elements can also be used
40 and 40 'are provided. Also, the mixing element
are arranged obliquely on the outer circumference of the drill pipe. Farther
Both drill pipe and mixing element can also be made of plastic
consist. Also, the mixing element can be curved in the axial direction or
be formed curved. Furthermore, it is not absolutely necessary
that the drilling fluid passes through the interior of the drill head into the
- 1010
- Bohrrohrdrill pipe
- 1212
- Bohrkopfwellhead
- 1414
- Schaftabschnittshank portion
- 1616
- SchweißnahtWeld
- 1818
- Spitzenabschnitttip portion
- 2021,22,232021,22,23
- Rippenribs
- 2424
- Zähneteeth
- 3030
- Ringraumannulus
- 3232
- Bohrlochwell
- 3434
- Rohrleitungpipeline
- 3636
- Austrittskanaloutlet channel
- 3838
- Bohrfluiddrilling fluid
- 40, 40'40, 40 '
- Mischelementmixing element
- 42, 42'42, 42 '
- Keilflächewedge surface
- 4444
- verjüngender Bereichrejuvenating area
- 4646
- Porenpore
- 4848
- stabilisierter Wandabschnittstabilized wall section
Claims (15)
dadurch gekennzeichnet, dass
am Außenumfang des Bohrrohres (10) zumindest ein sich in dessen Längsrichtung (X) erstreckendes Mischelement (40, 40') vorgesehen ist.An earth displacement drill comprising a drill pipe (10) and a drill bit (12) disposed at the end thereof, the radius of the drill pipe (10) being less than the largest radius of the drill bit (12),
characterized in that
on the outer circumference of the drill pipe (10) at least one in the longitudinal direction (X) extending mixing element (40, 40 ') is provided.
dadurch gekennzeichnet, dass
das Mischelement (40, 40') radial nicht über den Bohrkopf (12) vorsteht und sich insbesondere radial nach außen etwa bis zum größten Radius des Bohrkopfes erstreckt.A soil displacement drill according to claim 1,
characterized in that
the mixing element (40, 40 ') does not protrude radially beyond the drill head (12) and in particular extends radially outward approximately up to the largest radius of the drill head.
dadurch gekennzeichnet, dass
das Mischelement (40, 40') unmittelbar oberhalb des Bohrkopfes (12) angeordnet ist.A soil displacement drill according to claim 1,
characterized in that
the mixing element (40, 40 ') is arranged directly above the drill head (12).
dadurch gekennzeichnet, dass
das Mischelement (40, 40') zwischen sich und dem Bohrrohr (10) ein insbesondere geschlossenes Volumen einschließt. A soil displacement drill according to claim 1,
characterized in that
the mixing element (40, 40 ') between it and the drill pipe (10) includes a particular closed volume.
dadurch gekennzeichnet, dass
das Mischelement (40, 40') im Längs- und oder Querschnitt symmetrisch ausgebildet ist.A soil displacement drill according to claim 1,
characterized in that
the mixing element (40, 40 ') is symmetrical in longitudinal and / or cross-section.
dadurch gekennzeichnet, dass
das Mischelement (40, 40') zumindest eine Keilfläche (42, 42') aufweist, die im Querschnitt gesehen mit der Wand (48) eines von dem Bohrkopf gebildeten Bohrkanals einen sich verjüngenden Bereich (44) bildet.A soil displacement drill according to claim 1,
characterized in that
the mixing element (40, 40 ') has at least one wedge surface (42, 42') which, when viewed in cross-section, forms a tapered region (44) with the wall (48) of a drilling channel formed by the drill head.
dadurch gekennzeichnet, dass
das Mischelement (40) eine konvexe Außenfläche aufweist.A soil displacement drill according to claim 1,
characterized in that
the mixing element (40) has a convex outer surface.
dadurch gekennzeichnet, dass
das Mischelement (40, 40') zumindest eine etwa tangential zu dem Bohrrohr (10) verlaufende Außenfläche aufweist.A soil displacement drill according to claim 1,
characterized in that
the mixing element (40, 40 ') has at least one outer surface extending approximately tangentially to the drill pipe (10).
dadurch gekennzeichnet, dass
eine durch die Mittelachse (X) des Bohrrohres verlaufende Ebene mit der Längsachse des Mischelementes einen Winkel bildet.A soil displacement drill according to claim 1,
characterized in that
a plane passing through the central axis (X) of the drill pipe forms an angle with the longitudinal axis of the mixing element.
dadurch gekennzeichnet, dass
die Längserstreckung des Mischelementes (40, 40') etwa 150 - 250 % des Bohrrohrdurchmessers beträgt.A soil displacement drill according to claim 1,
characterized in that
the longitudinal extent of the mixing element (40, 40 ') is about 150 - 250% of the drill pipe diameter.
dadurch gekennzeichnet, dass
der Bohrkopf (12) zumindest eine radial oder axial abstehende Rippe (20 - 23) aufweist, an deren Unterseite einzelne sich in Bohrrichtung (X) erstreckende Zähne (24) vorgesehen sind.A soil displacement drill according to claim 1,
characterized in that
the drill head (12) has at least one radially or axially protruding rib (20-23), on the underside of which individual teeth (24) extending in the drilling direction (X) are provided.
dadurch gekennzeichnet, dass
das Bohrfluid zusätzlich in die Wand des Bohrkanals eingebracht, insbesondere eingepresst wird.Method according to claim 12,
characterized in that
the drilling fluid additionally introduced into the wall of the drilling channel, in particular is pressed.
dadurch gekennzeichnet, dass
als Bohrfluid eine härtbare Masse verwendet wird.Method according to claim 12,
characterized in that
as drilling fluid a curable composition is used.
dadurch gekennzeichnet, dass
das Bohrfluid durch das Bohrrohr und den Bohrkopf in das Bohrloch geleitet wird.Method according to claim 12,
characterized in that
the drilling fluid is directed through the drill pipe and drill bit into the wellbore.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP04003435A EP1564367B1 (en) | 2004-02-16 | 2004-02-16 | Earth displacement drill |
| DE502004001336T DE502004001336D1 (en) | 2004-02-16 | 2004-02-16 | Earth displacement drill |
| AT04003435T ATE338195T1 (en) | 2004-02-16 | 2004-02-16 | EARTH DISPLACEMENT DRILL |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP04003435A EP1564367B1 (en) | 2004-02-16 | 2004-02-16 | Earth displacement drill |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1564367A1 true EP1564367A1 (en) | 2005-08-17 |
| EP1564367B1 EP1564367B1 (en) | 2006-08-30 |
Family
ID=34684703
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP04003435A Expired - Lifetime EP1564367B1 (en) | 2004-02-16 | 2004-02-16 | Earth displacement drill |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP1564367B1 (en) |
| AT (1) | ATE338195T1 (en) |
| DE (1) | DE502004001336D1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2011958A1 (en) * | 2007-07-06 | 2009-01-07 | BAUER Maschinen GmbH | Auger |
| WO2018011659A1 (en) | 2016-07-14 | 2018-01-18 | Proferro Nv | A tip with protrusions for a ground displacement operation for a foundation pile |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3255833A (en) * | 1963-10-10 | 1966-06-14 | Texaco Development Corp | Drill bit auxiliary |
| US3799279A (en) * | 1972-09-25 | 1974-03-26 | R Farris | Optionally stabilized drilling tool |
| DE19530718C1 (en) * | 1995-08-21 | 1996-09-26 | Bauer Spezialtiefbau | Boring device and method for producing concrete post in bore hole |
| WO1998003764A1 (en) * | 1996-07-22 | 1998-01-29 | Gary Wayne Jarmyn | Underground warning system for underground conduits or pipes |
| DE19749409A1 (en) * | 1997-05-04 | 1999-05-12 | Gerd Hoermansdoerfer | Special drilling process and corresponding drill head |
| EP1013874A2 (en) * | 1998-12-23 | 2000-06-28 | Ludwig Pfeiffer, Hoch- und Tiefbau GmbH & Co. KG | Device and method for the replacement of tubes |
| DE10150278A1 (en) * | 2001-10-12 | 2003-04-30 | Tracto Technik | Method and device for soil stabilization |
| DE10205826A1 (en) * | 2001-10-18 | 2003-05-08 | Fitr Ges Fuer Innovation Im Ti | Laying a buried pipe uses a flow of a suspension to reduce friction, to be mixed with the displaced ground spoil, to form a seal in the ring gap around the pipe wall in the ground |
| US20030141111A1 (en) * | 2000-08-01 | 2003-07-31 | Giancarlo Pia | Drilling method |
-
2004
- 2004-02-16 DE DE502004001336T patent/DE502004001336D1/en not_active Expired - Fee Related
- 2004-02-16 EP EP04003435A patent/EP1564367B1/en not_active Expired - Lifetime
- 2004-02-16 AT AT04003435T patent/ATE338195T1/en not_active IP Right Cessation
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3255833A (en) * | 1963-10-10 | 1966-06-14 | Texaco Development Corp | Drill bit auxiliary |
| US3799279A (en) * | 1972-09-25 | 1974-03-26 | R Farris | Optionally stabilized drilling tool |
| DE19530718C1 (en) * | 1995-08-21 | 1996-09-26 | Bauer Spezialtiefbau | Boring device and method for producing concrete post in bore hole |
| WO1998003764A1 (en) * | 1996-07-22 | 1998-01-29 | Gary Wayne Jarmyn | Underground warning system for underground conduits or pipes |
| DE19749409A1 (en) * | 1997-05-04 | 1999-05-12 | Gerd Hoermansdoerfer | Special drilling process and corresponding drill head |
| EP1013874A2 (en) * | 1998-12-23 | 2000-06-28 | Ludwig Pfeiffer, Hoch- und Tiefbau GmbH & Co. KG | Device and method for the replacement of tubes |
| US20030141111A1 (en) * | 2000-08-01 | 2003-07-31 | Giancarlo Pia | Drilling method |
| DE10150278A1 (en) * | 2001-10-12 | 2003-04-30 | Tracto Technik | Method and device for soil stabilization |
| DE10205826A1 (en) * | 2001-10-18 | 2003-05-08 | Fitr Ges Fuer Innovation Im Ti | Laying a buried pipe uses a flow of a suspension to reduce friction, to be mixed with the displaced ground spoil, to form a seal in the ring gap around the pipe wall in the ground |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2011958A1 (en) * | 2007-07-06 | 2009-01-07 | BAUER Maschinen GmbH | Auger |
| WO2018011659A1 (en) | 2016-07-14 | 2018-01-18 | Proferro Nv | A tip with protrusions for a ground displacement operation for a foundation pile |
| US10683630B2 (en) | 2016-07-14 | 2020-06-16 | Proferro Nv | Tip with protrusions for a ground displacement operation for a foundation pile |
| EP3485096B1 (en) * | 2016-07-14 | 2022-08-10 | Proferro NV | A tip with protrusions for a ground displacement operation for a foundation pile |
Also Published As
| Publication number | Publication date |
|---|---|
| DE502004001336D1 (en) | 2006-10-12 |
| ATE338195T1 (en) | 2006-09-15 |
| EP1564367B1 (en) | 2006-08-30 |
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