EP0293584B1 - Drilling device for high pressure injection method - Google Patents

Drilling device for high pressure injection method Download PDF

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Publication number
EP0293584B1
EP0293584B1 EP88106156A EP88106156A EP0293584B1 EP 0293584 B1 EP0293584 B1 EP 0293584B1 EP 88106156 A EP88106156 A EP 88106156A EP 88106156 A EP88106156 A EP 88106156A EP 0293584 B1 EP0293584 B1 EP 0293584B1
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EP
European Patent Office
Prior art keywords
drilling
rod system
outer pipe
drilling device
flushing
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.)
Expired - Lifetime
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EP88106156A
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German (de)
French (fr)
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EP0293584A1 (en
Inventor
Johann Dipl.-Ing. Haberer
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Bauer Spezialtiefbau GmbH
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Bauer Spezialtiefbau GmbH
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Priority to AT88106156T priority Critical patent/ATE62293T1/en
Publication of EP0293584A1 publication Critical patent/EP0293584A1/en
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    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D7/00—Methods or apparatus for placing sheet pile bulkheads, piles, mouldpipes, or other moulds
    • E02D7/26—Placing by using several means simultaneously
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/22—Piles
    • E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
    • E02D5/38—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds
    • E02D5/385—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds with removal of the outer mould-pipes
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/22—Piles
    • E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
    • E02D5/46—Concrete or concrete-like piles cast in position ; Apparatus for making same making in situ by forcing bonding agents into gravel fillings or the soil
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/22—Piles
    • E02D5/62—Compacting the soil at the footing or in or along a casing by forcing cement or like material through tubes
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK 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
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B7/00—Special methods or apparatus for drilling
    • E21B7/002—Drilling with diversely driven shafts extending into the borehole
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B7/00—Special methods or apparatus for drilling
    • E21B7/20—Driving or forcing casings or pipes into boreholes, e.g. sinking; Simultaneously drilling and casing boreholes

Definitions

  • the invention relates to a drilling device according to the preamble of claim 1 and further to a drilling method using this drilling device.
  • High-pressure injection processes are used in civil engineering for the production of supporting and sealing walls in the ground area, underpinning bodies and plate-like bodies for base seals.
  • a drill bit attached to a rod is primarily introduced with external rinsing.
  • a bentonite-cement suspension is injected into the soil under high pressure via a horizontally oriented nozzle located in the lower part of the drill pipe.
  • By rotating the drill pipe it is possible to produce column-shaped injection bodies during withdrawal, the size and strength of which are determined by the selection of the pulling speed, pump pressure and nozzle diameter.
  • the wall and plate-shaped injection bodies are contained by connecting several columns.
  • One of the known devices consists of a tubular shaft which has a spiral drill helix on its outer circumference. The end of the drill helix is set with teeth.
  • the drill consisting of the tubular shaft and the helix, can be driven by a motor.
  • a channel rod which has a drill head at its end and an injection nozzle for the discharge of a high-pressure suspension.
  • the channel linkage can be driven via a separate drive, regardless of that of the drill.
  • the drill bit of the channel rod is longitudinally displaceable with respect to the drill.
  • the invention has the advantage that the drilling of the channel rod is made easier by the drilling aid of the outer tube.
  • the guidance of the outer pipe ensures a more precise sinking. In particular with horizontal propulsion, a deviation of the duct linkage from the propelled direction of propulsion can be effectively countered.
  • Another advantage of the invention is that Feeding a flushing medium in the area of the drill bit supports the drilling process and is thus made easier.
  • annular space is present between the outer tube and the channel rod. Excess injection suspension can be passed through this space escape upwards unhindered. This prevents uncontrolled injection suspension from causing uplifts in the ground. In addition, there is no risk of blockages that could otherwise occur when the borehole wall collapses. Since the distance between the outer pipe and the duct linkage can be freely selected, an optimal adjustment to the drilling base can be made by appropriate selection of the outer pipe diameter.
  • the channel linkage includes a feed for additional flushing medium for the drill head.
  • the drilling method is preferably developed in that the outer tube and the channel linkage can be rotated independently of one another with respect to their direction of rotation and / or their speed.
  • the propulsion of the channel rod and the outer tube are independent of one another.
  • FIG. 1 a drilling tool and the associated linkage is illustrated during a drilling phase.
  • the drilling tool consists of a double-walled outer tube 1 with an end drill bit 2.
  • a separate, independent channel linkage 3 with a drill head 4 is arranged coaxially.
  • both the outer tube 1 and the channel linkage 3 are each provided with a separate drill drive, which can be mounted above the ground, for example, on a carriage.
  • the outer tube 1 and the rod 3 are drilled simultaneously, the directions of rotation being able to be in opposite phases, as the direction of rotation arrows 6 indicate. It is also possible to provide different speeds due to the two independent drilling drives. The choice of the directions of rotation and the speeds is selected depending on the properties of the soil 5 with a view to optimal propulsion.
  • a flushing medium for example bentonite suspension, is introduced as a drilling aid for the outer tube through a feed channel 7, which is formed between the outer wall 8 and the inner wall 9 of the outer tube.
  • the necessary pumping equipment and storage tanks are installed on the surface of the earth.
  • the flushing medium In the area of the drill bit 2, the flushing medium reaches the soil acted upon by the drill bit 2 via outlet openings 10, which are distributed over the circumference of the outer tube 1.
  • the escaping flushing medium is provided with the reference number 11 in the figure.
  • the bottom of the drill is further processed with the help of the drill head 4.
  • the drill head 4 is also provided with outlet openings (not shown) for further flushing medium which is supplied in the interior of the channel rod 3. It acts in the area 13 in front of the drill head 4.
  • FIG. 1 shows a configuration in which the outer tube 1 leads the channel rod 3. Depending on the geology, it can equally be expedient to guide the channel linkage 3 in front of the outer tube 1 or at the same height of the outer tube 1.
  • the linkage 3 has at least one injection nozzle 12, which is oriented essentially horizontally. It is connected in the interior of the channel linkage 3 via a feed line (not shown) to a high-pressure pump on the surface of the earth, via which a high-pressure suspension is introduced, as the following description explains.
  • the rod 3 After reaching the final depth, the rod 3 is brought into a position in which the injection nozzle 12 or, if appropriate, a plurality of such injection nozzles are in front of the drill bit 2. This position is illustrated in FIG. 2.
  • the high-pressure suspension 14 is then injected into the soil 5, a cylindrical injection body 15 being produced by rotating and pulling the drill pipe 3.
  • the outer tube 1 and the channel linkage 3 is partially shown in longitudinal section along the longitudinal center line 17. It can be seen that the channel linkage 3 consists of two coaxial tubes, the outer channel tube being provided with the reference number 18 and the inner channel tube with the reference number 20. The suspension is passed to the injection nozzle 12 via the inner sewer pipe 20.
  • this additional flushing medium can also be used to flush out the annular space 16.
  • the outer sewer pipe 18 is provided with at least one flushing nozzle 22, which directs a liquid jet from the bottom to the top. This measure ensures a continuous backflow in the annular space 16 and prevents clogging or partial narrowing of the annular space 16.
  • the emerging further flushing medium flows upwards towards the surface of the earth and supports the transport of the drilling material which has been released from the drill bit 2 and the drill head 4 (FIG. 1) under the additional influence of flushing medium. It prevents this drill material from assembling or clumping in the annular space 16.
  • flushing nozzle 22 it may be sufficient to have a single flushing nozzle 22. If several such flushing nozzles are distributed along the circumference of the outer sewer pipe 18, the continuous transport of drillings to the surface of the earth can be further improved. In particular in the case of longer duct linkages 3, the flushing of the annular space 16 is supported when flushing nozzles are stacked vertically are arranged along the channel rod 3.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Structural Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • General Engineering & Computer Science (AREA)
  • Civil Engineering (AREA)
  • Paleontology (AREA)
  • Fluid Mechanics (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Earth Drilling (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
  • Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)

Abstract

A drilling device as well as a high-pressure injection method which can be carried out with the use of this drilling device for producing injection bodies in the ground are described. The drilling device comprises a rod (3) provided with a drill head. At its end, the rod (3) is provided with a drill bit (4) as well as at least one injection nozzle (12) for discharging injection suspension. The rod (3) is surrounded by an outer tube (1) which is provided with a further drill head (2) as well as with a feed channel (7) for flushing medium. Rod (3) and outer tube (1) can be operated independently of one another with regard to direction of rotation, rotary speed and drilling advance. After the final depth is reached, the rod (3) is moved into a position in which the injection nozzle (12) is in front of the outer-tube drill bit (2). During the subsequent withdrawal and injection, the outer tube (1) is retracted at the same time as the rod (3). Excess injection suspension can escape to the top in the annular space (16) between the outer tube (1) and the rod (3). <IMAGE>

Description

Die Erfindung betrifft eine Bohrvorrichtung gemäß dem Oberbegriff des Anspruchs 1 und ferner ein Bohrverfahren unter Verwendung dieser Bohrvorrichtung.The invention relates to a drilling device according to the preamble of claim 1 and further to a drilling method using this drilling device.

Hochdruck-Injektions-Verfahren werden im Tiefbau zur Herstellung von Stütz- und Dichtwänden im Erdbereich, Unterfangungskörpern und plattenartigen Körpern für Sohldichtungen verwendet. Hierbei wird vornehmlich unter Außenspülung eine an einem Gestänge angebrachte Bohrkrone eingebracht. Nach Erreichen der Endteufe wird über eine im unteren Teil des Bohrgestänges befindliche, horizontal ausgerichtete Düse unter Hochdruck eine Bentonit-Zement-Suspension in das Erdreich injiziert. Durch Drehen des Bohrgestänges ist es beim Zurückziehen möglich, säulenförmige Injektionskörper herzustellen, deren Größe und Festigkeit durch die Wahl von Ziehgeschwindigkeit, Pumpdruck und Düsendurchmesser festgelegt wird. Durch Verbindung von mehreren Säulen enthält man die wand- und plattenförmigen Injektionskörper.High-pressure injection processes are used in civil engineering for the production of supporting and sealing walls in the ground area, underpinning bodies and plate-like bodies for base seals. In this case, a drill bit attached to a rod is primarily introduced with external rinsing. After reaching the final depth, a bentonite-cement suspension is injected into the soil under high pressure via a horizontally oriented nozzle located in the lower part of the drill pipe. By rotating the drill pipe, it is possible to produce column-shaped injection bodies during withdrawal, the size and strength of which are determined by the selection of the pulling speed, pump pressure and nozzle diameter. The wall and plate-shaped injection bodies are contained by connecting several columns.

Aus der FR-A-25 66 813 sind Vorrichtungen und ein Verfahren zur Herstellung eines Bohrpfahls bekannt. Eine der bekannten Vorrichtungen besteht dabei aus einem rohrförmigen Schaft, der an seinem äußeren Umfang eine spiralförmige Bohrwendel aufweist. Das Ende der Bohrwendel ist mit Zähnen besetzt. Der Bohrer, bestehend aus dem rohrförmigen Schaft und der Bohrwendel, ist über einen Motor antreibbar. Im Innern des rohrförmigen Schaftes befindet sich ein Kanalgestänge, welches an seinem Ende einen Bohrkopf aufweist und eine Injektionsdüse zum Austritt einer Hochdrucksuspension. Das Kanalgestänge ist über einen separaten Antrieb, unabhängig von dem des Bohrers, antreibbar. Die Bohrkrone des Kanalgestänges ist bezüglich des Bohrers längsverschieblich.From FR-A-25 66 813 devices and a method for producing a bored pile are known. One of the known devices consists of a tubular shaft which has a spiral drill helix on its outer circumference. The end of the drill helix is set with teeth. The drill, consisting of the tubular shaft and the helix, can be driven by a motor. in the Inside the tubular shaft is a channel rod, which has a drill head at its end and an injection nozzle for the discharge of a high-pressure suspension. The channel linkage can be driven via a separate drive, regardless of that of the drill. The drill bit of the channel rod is longitudinally displaceable with respect to the drill.

Bei der bekannten Vorrichtung ist es von Nachteil, daß aufgrund der Bohrwendel keine zufriedenstellende Zielgenauigkeit der Bohrung erreicht werden kann. Weiterhin ist es von Nachteil, daß das oberhalb des Bohrkopfes des Kanalgestänges angeordnete Ende der Bohrwendel beim Bohrvorgang nicht durch ein Spülmedium unterstützt wird.In the known device, it is disadvantageous that, due to the helix, it is not possible to achieve a satisfactory accuracy of the bore. Furthermore, it is disadvantageous that the end of the drill helix arranged above the drill head of the channel rod is not supported by a flushing medium during the drilling process.

Es ist Aufgabe der vorliegenden Erfindung, eine Bohrvorrichtung sowie ein Verfahren der eingangs genannten Art anzugeben, bei welchem auf einfache Weise eine zufriedenstellende Zielgenauigkeit der Bohrung und die Zuführung eines Spülmediums erreicht werden kann.It is an object of the present invention to provide a drilling device and a method of the type mentioned in the introduction, in which a satisfactory accuracy of the drilling and the supply of a flushing medium can be achieved in a simple manner.

Diese Aufgabe wird bei einer gattungsgemäßen Bohrvorrichtung durch die kennzeichnenden Merkmale des Anspruchs 1 gelöst.This object is achieved in a generic drilling device by the characterizing features of claim 1.

Verfahrensmäßig wird die Aufgabe mit Hilfe dieser Bohrvorrichtung durch die kennzeichnenden Merkmale des Anspruchs 8 gelöst.In terms of method, the task is solved with the help of this drilling device by the characterizing features of claim 8.

Die Erfindung hat den Vorteil, daß das Abbohren des Kanalgestänges durch die Bohrhilfe des Außenrohres erleichtert wird. Die Führung des Außenrohres gewährleistet ein zielgenaueres Abteufen. Insbesondere bei horizontalem Vortrieb kann einem Abweichen des Kanalgestänges von der vorgetriebenen Vortriebsrichtung wirksam begegnet werden. Ein weiterer Vorteil der Erfindung besteht darin, daß durch das Zuführen eines Spülmediums im Bereich der Bohrkrone der Bohrvorgang unterstützt und somit erleichtert wird.The invention has the advantage that the drilling of the channel rod is made easier by the drilling aid of the outer tube. The guidance of the outer pipe ensures a more precise sinking. In particular with horizontal propulsion, a deviation of the duct linkage from the propelled direction of propulsion can be effectively countered. Another advantage of the invention is that Feeding a flushing medium in the area of the drill bit supports the drilling process and is thus made easier.

Ferner erweist es sich als vorteilhaft, daß zwischen dem Außenrohr und dem Kanalgestänge ein Ringraum vorhanden ist. Über diesen Zwischenraum kann überschüssige Injektions-Suspension ungehindert nach oben entweichen. Somit wird vermieden, daß unkontrolliert austretende Injektions-Suspension Hebungen im Boden verursacht. Außerdem besteht keine Gefahr von Verstopfungen, die ansonsten bei einem Einfallen der Bohrlochwand auftreten könnten. Da der Abstand zwischen dem Außenrohr und dem Kanalgestänge frei wählbar ist, kann durch entsprechende Wahl des Außenrohrdurchmessers eine optimale Anpassung an den Bohrgrund vorgenommen werden.Furthermore, it proves to be advantageous that an annular space is present between the outer tube and the channel rod. Excess injection suspension can be passed through this space escape upwards unhindered. This prevents uncontrolled injection suspension from causing uplifts in the ground. In addition, there is no risk of blockages that could otherwise occur when the borehole wall collapses. Since the distance between the outer pipe and the duct linkage can be freely selected, an optimal adjustment to the drilling base can be made by appropriate selection of the outer pipe diameter.

Bevorzugt ist weiterhin vorgesehen, daß das Kanalgestänge eine Zuführung für weiteres Spülmedium für den Bohrkopf umfaßt. Das Bohrverfahren wird bevorzugt dadurch weitergebildet, daß das Außenrohr und das Kanalgestänge bezüglich ihrer Drehrichtung und/oder ihrer Drehzahl unabhängig voneinander rotierbar sind.It is also preferably provided that the channel linkage includes a feed for additional flushing medium for the drill head. The drilling method is preferably developed in that the outer tube and the channel linkage can be rotated independently of one another with respect to their direction of rotation and / or their speed.

Ferner kann es von Vorteil sein, daß der Vortrieb des Kanalsgestänges und des Außenrohrs unabhängig voneinander sind.It can also be advantageous that the propulsion of the channel rod and the outer tube are independent of one another.

Durch diese Maßnahmen ist eine optimale Anpassung an die jeweilige Geologie sowohl beim Abbohren als auch beim Ziehen durchführbar. Der Bohrfortschritt des Außenrohres und des Kanalgestänges kann unabhängig voneinander gewählt werden. Weitere bevorzugte Ausgestaltungen der Erfindung sind in Unteransprüchen beschrieben. Im folgenden wird die Erfindung anhand eines in Figuren dargestellten Ausführungsbeispieles weiter beschrieben.

  • Figur 1 zeigt schematisch einen Längsschnitt durch ein Bohrloch während des Abbohrens einer Bohrvorrichtung
  • Figur 2 zeigt schematisch einen Längsschnitt durch das Bohrloch gemaß Figur 1 während des Ziehens der Bohrvorrichtung und
  • Figur 3 zeigt schematisch einen Längsschnitt durch die Bohrvorrichtung.
Through these measures, an optimal adaptation to the respective geology can be carried out both when drilling and when pulling. The drilling progress of the outer pipe and the ductwork can be selected independently of one another. Further preferred embodiments of the invention are described in the subclaims. In the following, the invention is further described with the aid of an exemplary embodiment shown in the figures.
  • Figure 1 shows schematically a longitudinal section through a borehole while drilling a drilling device
  • Figure 2 shows schematically a longitudinal section through the borehole according to Figure 1 while pulling the drilling device and
  • Figure 3 shows schematically a longitudinal section through the drilling device.

In Figur 1 ist ein Bohrwerkzeug und das zugehörige Gestänge während einer Bohrphase veranschaulicht. Das Bohrwerkzeug besteht aus einem doppelwandigen Außenrohr 1 mit einer endseitigen Bohrkrone 2. Im Inneren des Außenrohres 1 ist koaxial ein separates, unabhängiges Kanalgestänge 3 mit einem Bohrkopf 4 angeordnet. Aus Gründen einer übersichtlichen Darstellung ist nicht gezeigt, daß sowohl das Außenrohr 1 als auch das Kanalgestänge 3 jeweils mit einem separaten Bohrantrieb versehen sind, die oberhalb des Erdreichs beispielsweise auf einer Lafette montiert sein können.In Figure 1, a drilling tool and the associated linkage is illustrated during a drilling phase. The drilling tool consists of a double-walled outer tube 1 with an end drill bit 2. Inside the outer tube 1, a separate, independent channel linkage 3 with a drill head 4 is arranged coaxially. For the sake of a clear representation, it is not shown that both the outer tube 1 and the channel linkage 3 are each provided with a separate drill drive, which can be mounted above the ground, for example, on a carriage.

Während der in der Figur 1 gezeigten Bohrphase wird das Außenrohr 1 und das Gestänge 3 gleichzeitig abgebohrt, wobei die Drehrichtungen gegenphasig sein können, wie die Drehrichtungspfeile 6 andeuten. Ebenso ist es möglich, aufgrund der beiden unabhängigen Bohrantriebe unterschiedliche Drehzahlen vorzusehen. Die Wahl der Drehrichtungen und der Drehzahlen wird in Abhängigkeit von den Eigenschaften des Erdreichs 5 im Hinblick auf einen optimalen Vortrieb gewählt. Durch einen Zuführkanal 7, der zwischen der Außenwand 8 und der Innenwand 9 des Außenrohres gebildet ist, wird ein Spülmedium, beispielsweise Bentonit-Suspension, als Bohrhilfe für das Außenrohr eingeleitet. Die dazu erforderlichen Pumpeinrichtungen und Vorratsbehälter sind an der Erdoberfläche installiert. Das Spülmedium gelangt im Bereich der Bohrkrone 2 über Austrittsöffnungen 10, die über den Umfang des Außenrohres 1 verteilt sind, in das von der Bohrkrone 2 beaufschlagte Erdreich. Das austretende Spülmedium ist in der Figur mit dem Bezugszeichen 11 versehen. Der Bohrgrund wird ferner mit Hilfe des Bohrkopfes 4 bearbeitet. Auch der Bohrkopf 4 ist mit Austrittsöffnungen (nicht dargestellt) für weiteres Spülmedium versehen, welches im Inneren des Kanalgestänges 3 zugeführt wird. Es entfaltet seine Wirkung im Bereich 13 vor dem Bohrkopf 4.During the drilling phase shown in FIG. 1, the outer tube 1 and the rod 3 are drilled simultaneously, the directions of rotation being able to be in opposite phases, as the direction of rotation arrows 6 indicate. It is also possible to provide different speeds due to the two independent drilling drives. The choice of the directions of rotation and the speeds is selected depending on the properties of the soil 5 with a view to optimal propulsion. A flushing medium, for example bentonite suspension, is introduced as a drilling aid for the outer tube through a feed channel 7, which is formed between the outer wall 8 and the inner wall 9 of the outer tube. The necessary pumping equipment and storage tanks are installed on the surface of the earth. In the area of the drill bit 2, the flushing medium reaches the soil acted upon by the drill bit 2 via outlet openings 10, which are distributed over the circumference of the outer tube 1. The escaping flushing medium is provided with the reference number 11 in the figure. The bottom of the drill is further processed with the help of the drill head 4. The drill head 4 is also provided with outlet openings (not shown) for further flushing medium which is supplied in the interior of the channel rod 3. It acts in the area 13 in front of the drill head 4.

In der Figur 1 ist eine Konfiguration dargestellt, bei welcher das Außenrohr 1 dem Kanalgestänge 3 vorauseilt. In Abhängigkeit von der jeweiligen Geologie kann es aber gleichermaßen zweckmäßig sein, das Kanalgestänge 3 vor dem Außenrohr 1 oder auf gleicher Höhe des Außenrohrs 1 zu führen.FIG. 1 shows a configuration in which the outer tube 1 leads the channel rod 3. Depending on the geology, it can equally be expedient to guide the channel linkage 3 in front of the outer tube 1 or at the same height of the outer tube 1.

Im unteren Bereich weist das Gestänge 3 mindestens eine Injektionsdüse 12 auf, die im wesentlichen horizontal ausgerichtet ist. Sie ist im Inneren des Kanalgestänges 3 über eine Zuleitung (nicht dargestellt) mit einer Hochdruckpumpe an der Erdoberfläche verbunden, über welche eine Hochdruck-Suspension eingeleitet wird, wie die nachfolgende Beschreibung erläutert.In the lower area, the linkage 3 has at least one injection nozzle 12, which is oriented essentially horizontally. It is connected in the interior of the channel linkage 3 via a feed line (not shown) to a high-pressure pump on the surface of the earth, via which a high-pressure suspension is introduced, as the following description explains.

Nach Erreichen der Endteufe wird das Gestänge 3 in eine Stellung gebracht, in welcher die Injektionsdüse 12 oder gegebenenfalls mehrere derartiger Injektionsdüsen vor der Bohrkrone 2 stehen. Diese Stellung veranschaulicht Figur 2. Anschließend wird die Hochdruck-Suspension 14 in das Erdreich 5 injiziert, wobei durch Drehen und Ziehen des Bohrgestänges 3 ein zylinderförmiger Injektionskörper 15 erzeugt wird.After reaching the final depth, the rod 3 is brought into a position in which the injection nozzle 12 or, if appropriate, a plurality of such injection nozzles are in front of the drill bit 2. This position is illustrated in FIG. 2. The high-pressure suspension 14 is then injected into the soil 5, a cylindrical injection body 15 being produced by rotating and pulling the drill pipe 3.

Gleichzeitig mit dem Kanalgestänge 3 wird auch das Außenrohr 1 zurückgezogen. Überschüssige Injektions-Suspension, die nicht mehr in das Erdreich 5 eindringen kann, tritt über eine Ringraum 16 zwischen dem Außenrohr 1 und dem Kanalgestänge 3 nach oben an die Erdoberfläche aus.At the same time as the duct linkage 3, the outer tube 1 is also withdrawn. Excess injection suspension, which can no longer penetrate the soil 5, exits via an annular space 16 between the outer tube 1 and the channel rod 3 upwards to the earth's surface.

In Figur 3 ist das Außenrohr 1 und das Kanalgestänge 3 teilweise im Längsschnitt entlang der Längsmittellinie 17 dargestellt. Es wird ersichtlich, daß das Kanalgestänge 3 aus zwei koaxialen Rohren besteht, wobei das äußere Kanalrohr mit dem Bezugszeichen 18, das innere Kanalrohr mit dem Bezugszeichen 20 versehen sind. Über das innere Kanalrohr 20 wird die Suspension an die Injektionsdüse 12 geleitet.In Figure 3, the outer tube 1 and the channel linkage 3 is partially shown in longitudinal section along the longitudinal center line 17. It can be seen that the channel linkage 3 consists of two coaxial tubes, the outer channel tube being provided with the reference number 18 and the inner channel tube with the reference number 20. The suspension is passed to the injection nozzle 12 via the inner sewer pipe 20.

Eine Spülleitung 21, die durch den Rohrraum zwischen dem äußeren Kanalrohr 18 und dem inneren Kanalrohr 20 gebildet wird, dient zur Versorgung mit dem weiteren Spülmedium, für das bevorzugt Wasser verwendet wird.A flushing line 21, which is formed by the tube space between the outer sewer pipe 18 and the inner sewer pipe 20, is used to supply the further flushing medium, for which water is preferably used.

Wie die Figur 3 veranschaulicht, kann dieses weitere Spülmedium auch zum Ausspülen des Ringraums 16 verwendet werden. Zu diesem Zweck ist das äußere Kanalrohr 18 mit mindestens einer Spüldüse 22 versehen, welche einen Flüssigkeitsstrahl von unten nach oben lenkt. Durch diese Maßnahme wird ein kontinuierlicher Rückfluß im Ringraum 16 sichergestellt, und ein Verstopfen oder teilweises Verengen des Ringraums 16 verhindert.As FIG. 3 illustrates, this additional flushing medium can also be used to flush out the annular space 16. For this purpose, the outer sewer pipe 18 is provided with at least one flushing nozzle 22, which directs a liquid jet from the bottom to the top. This measure ensures a continuous backflow in the annular space 16 and prevents clogging or partial narrowing of the annular space 16.

Das austretende weitere Spülmedium fließt nach oben in Richtung auf die Erdoberfläche und unterstützt den Transport des Bohrguts, das von der Bohrkrone 2 und dem Bohrkopf 4 (Figur 1) unter dem zusätzlichen Einfluß von Spülmedium gelöst wurde. Es verhindert, daß sich dieses Bohrgut im Ringraum 16 zusammensetzt oder verklumpt.The emerging further flushing medium flows upwards towards the surface of the earth and supports the transport of the drilling material which has been released from the drill bit 2 and the drill head 4 (FIG. 1) under the additional influence of flushing medium. It prevents this drill material from assembling or clumping in the annular space 16.

Grundsätzlich kann es ausreichend sein, daß eine einzige Spüldüse 22 vorhanden ist. Werden mehrere derartiger Spüldüsen entlang des Umfangs des äußeren Kanalrohrs 18 verteilt, so kann der kontinuierliche Bohrguttransport an die Erdoberfläche weiter verbessert werden. Insbesondere bei längeren Kanalgestängen 3 wird die Spülung des Ringraums 16 unterstützt, wenn Spüldüsen vertikal übereinander entlang des Kanalgestänges 3 angeordnet sind.In principle, it may be sufficient to have a single flushing nozzle 22. If several such flushing nozzles are distributed along the circumference of the outer sewer pipe 18, the continuous transport of drillings to the surface of the earth can be further improved. In particular in the case of longer duct linkages 3, the flushing of the annular space 16 is supported when flushing nozzles are stacked vertically are arranged along the channel rod 3.

Da eine Verstopfung oder Verengung des Ringraums 16 nicht nur beim Abbohren eintreten kann, wird die Spüldüse 22 gleichermaßen beim Rückziehen der Bohrvorrichtung, wie es im Zusammenhang mit Figur 2 beschrieben ist, betätigt. In dieser Phase wird überschüssige Hochdruck-Suspension nach oben abgeführt.Since a blockage or constriction of the annular space 16 cannot only occur during drilling, the flushing nozzle 22 is actuated equally when the drilling device is withdrawn, as described in connection with FIG. 2. In this phase, excess high-pressure suspension is discharged upwards.

Claims (12)

1. Drilling device for high pressure injection methods with a first drilling drive and a duct rod system (3), which has at least one injection nozzle (12) for the discharge of a high pressure suspension and at its end a drill head (4) and in which around the duct rod system (3) is placed a separate outer pipe (1) with a separate core bit (2) and is longitudinally displaceable with an independent second drilling drive, characterized in that the outer pipe (1) is constructed in double-walled manner for forming a supply duct (7) for the flushing medium (11) and which is provided in the vicinity of the core bit (2) with outlet ports (10).
2. Drilling device according to claim 1, characterized in that an annular space (16) is provided between the outer pipe (1) and the duct rod system (3).
3. Drilling device according to claims 1 or 2, characterized in that the duct rod system (3) incorporates a flushing line for a further flushing medium for the drill head (4).
4. Drilling device according to one of the preceding claims, characterized in that the duct rod system (3) has at least one flushing nozzle (22) passing out into the annular space (16) and arranged behind the injection nozzle (2) in the forward drive direction.
5. Drilling device according to claim 4, characterized in that the flushing nozzle (22) is directed away from the drill head-side end.
6. Drilling device according to claims 4 or 5, characterized in that several flushing nozzles (22) are distributed over the circumference of the duct rod system (3).
7. Drilling device according to one of the claims 4 to 6, characterized in that several flushing nozzles (22) are distributed over the length of the duct rod system (3).
8. Drilling method using the drilling device according to claim 1, characterized by the following method steps:
a) Simultaneous drilling by the duct rod system (3) and outer pipe (1),
b) Introduction of a flushing medium (11) as a drilling aid for the outer pipe (1),
c) After reaching the end depth placing of the injection nozzle (12) upstream of the core bit (2) of the outer pipe and then
d) Simultaneous retraction of the outer pipe (1) and the duct rod system (3), accompanied by the injection of the high pressure suspension (14).
9. Drilling method according to claim 8, characterized in that the outer pipe (1) and the duct rod system (3) are moved with different rotation directions.
10. Drilling method according to claims 8 or 9, characterized in that the outer pipe (1) and the duct rod system (3) are moved at different speeds.
11. Drilling method according to one of the claims 8 to 10, characterized in that the outer pipe (1) and duct rod system (3) are sunk with different advance drives.
12. Drilling method according to one of the claims 8 to 11, characterized in that during sinking and/or retraction by means of a flushing nozzle (22) further flushing medium is introduced into the annular space (16) for flushing the same.
EP88106156A 1987-06-02 1988-04-18 Drilling device for high pressure injection method Expired - Lifetime EP0293584B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88106156T ATE62293T1 (en) 1987-06-02 1988-04-18 DRILLING DEVICE FOR A HIGH PRESSURE INJECTION DRILLING METHOD.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3718480 1987-06-02
DE3718480A DE3718480C2 (en) 1987-06-02 1987-06-02 Drilling device for a high pressure injection drilling method and drilling method using the drilling device

Publications (2)

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EP0293584A1 EP0293584A1 (en) 1988-12-07
EP0293584B1 true EP0293584B1 (en) 1991-04-03

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AT (1) ATE62293T1 (en)
DE (2) DE3718480C2 (en)

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FR2657906A1 (en) * 1990-02-06 1991-08-09 Morillon Corvol Courbot METHOD OF MAKING MOLDED PILES IN THE SOIL, MOLDED PIGS SO OBTAINED AND IMPRESSION TUBE USED TO IMPLEMENT THIS METHOD.
DE4121394A1 (en) * 1991-06-28 1993-01-14 Klemm Bohrtech Injection method of underground mineral extraction - using drill string with injection head used as drill bit, and flushing up loosened material from deposit to top of drill string
JPH089863B2 (en) * 1991-08-14 1996-01-31 株式会社エヌ、アイ、テイ All-angle ground improvement body construction method and its equipment
DE4138356A1 (en) * 1991-11-21 1993-05-27 Gu Tiefbau Ag DRILLING DEVICE FOR DEEP CONSTRUCTION AND METHOD FOR MANUFACTURING STABILIZING SAEULES OR SIMILAR PICTURES IN EARTH
DE4323766A1 (en) * 1993-07-15 1995-01-19 Keller Grundbau Gmbh Process for applying binder suspension
ES2143356B1 (en) * 1997-01-10 2000-12-16 Codina Juan Vicente Herrero DEVICE AND PROCEDURE FOR THE REALIZATION OF FOUNDATION PILOTS IN DRILLING MACHINES.
DE10005475A1 (en) * 2000-02-08 2001-08-09 Guenter Klemm Drilling device; has inner rod, hollow outer rod and rotation device to rotate both rods, which drives drive wheel of outer rod and drive wheel of inner rod
DE10319800A1 (en) * 2003-04-30 2004-11-25 Kleis, Simone Hollow crown for core-drilling machine, has pipe with cutting elements arranged at front side along the propulsion direction, and a central fluid supply with its outlet set within the sphere of activity of the cutting elements
DE102006023799B4 (en) * 2006-05-20 2014-05-15 Franki Grundbau Gmbh & Co.Kg Device for producing foundation elements
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DE102011000320A1 (en) * 2011-01-25 2012-07-26 TERRA AG für Tiefbautechnik Drilling rig for carrying out drilling in soil, comprises drilling frame, and drive unit slidably arranged on frame, where drive unit has rod cartridge for detachably connecting with drilling pipe, and drive motor standing with cartridge
WO2017028645A1 (en) * 2015-08-18 2017-02-23 山东大学 Anti-collapse two-way rib wing jet grouting drill, grouting consolidation system and method
CN109441425B (en) * 2018-11-20 2022-02-11 常州大学 Method for measuring rock carrying capacity of horizontal well double-wall drill pipe system
CN113356255A (en) * 2021-06-25 2021-09-07 上海涵格建设工程有限公司 Weak geological building foundation reinforcement construction method

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Also Published As

Publication number Publication date
EP0293584A1 (en) 1988-12-07
DE3718480C1 (en) 1988-09-22
DE3718480C2 (en) 1994-04-14
ATE62293T1 (en) 1991-04-15
DE3862239D1 (en) 1991-05-08

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