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EP0690953A1 - Drilling column with sledgehammer drilling head - Google Patents

Drilling column with sledgehammer drilling head

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Publication number
EP0690953A1
EP0690953A1 EP94912494A EP94912494A EP0690953A1 EP 0690953 A1 EP0690953 A1 EP 0690953A1 EP 94912494 A EP94912494 A EP 94912494A EP 94912494 A EP94912494 A EP 94912494A EP 0690953 A1 EP0690953 A1 EP 0690953A1
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EP
European Patent Office
Prior art keywords
drill pipe
drill
drilling
compressed air
head
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
Application number
EP94912494A
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German (de)
French (fr)
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EP0690953B1 (en
Inventor
Franz Blickhan
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Individual
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Individual
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Publication of EP0690953B1 publication Critical patent/EP0690953B1/en
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Classifications

    • 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
    • E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
    • E21B21/12—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor using drilling pipes with plural fluid passages, e.g. closed circulation systems

Definitions

  • the invention relates to a drill pipe with an air duct for supplying compressed air to a Senkhammer drill head, which has a percussion drill bit at its lower end and a central connector with a compressed air supply opening at its upper end.
  • the pneumatic hammer When using a hammer drill, the pneumatic hammer is at the lowest point in the borehole.
  • the compressed air required for the hammer drive is supplied through the drill pipe designed as a simple drill pipe.
  • the compressed air emerges from the percussion drill bit and flows upwards in the space between the borehole wall and the drill pipe, the cuttings generated during drilling being conveyed upwards.
  • the drill string consists of a drill pipe with a central delivery channel, on the circumference of which the air channel is arranged, that a connector is attached between the lower end of the drill pipe and the connector of the Senkhammer drill head, one from the central Has conveying channel of the drill pipe to a lateral inlet opening and at least one air channel section running from the air channel of the drill pipe to the central connecting piece of the Senkhammer drill head, and that an apron which is open at the bottom is arranged in the region of the lateral inlet opening of the connecting piece.
  • the compressed air required to drive the Senkhammer drill head is within the Connection piece passed from the air duct opening on the circumference down to the central connector of the Senkhammer drilling head. This ensures that the Senkhammer drill head is still mounted centrally on the drill string, which is necessary for reasons of force, and that the compressed air supply continues to be centered on the connector, so that design changes to the Senkhammer drill head are not required. Therefore, the conventional Senkhammer drill heads can be used unchanged.
  • the apron which is tightly attached to the connecting piece and surrounds the drive part of the countersink drill head, is primarily open in the area below the lateral inlet opening of the connecting piece, in order to receive the cuttings that occur during drilling immediately above the percussion drill bit.
  • the water column which is usually present in the borehole, presses the cuttings with the compressed air into the apron, which is open at the bottom, from where it reaches the central production channel of the drill pipe in an essentially unobstructed flow channel and is conveyed upwards.
  • the apron is a tube which is connected to the connecting piece and is open at the bottom and which is offset eccentrically with respect to the countersink drill head on the side of the inlet opening. It is thereby achieved that the entry cross section into the apron is greatest below the entry opening of the connecting piece, whereby the entire available space between the sink hammer and the borehole wall can be used. As a result, even relatively large pieces of cuttings can be transported away without difficulty.
  • the drill pipe is sealed off from the borehole opening and the space between the drill pipe and the borehole opening is connected to a supply line for compressed air and / or water.
  • Fig. 1 shows a longitudinal section through a countersink drill head at the lower end of a drill string
  • Fig. 2 shows a longitudinal section through a countersink drill head arranged in a borehole with drill pipe.
  • the drill pipe 1 used in the exemplary embodiments shown and carried by a drilling device consists of a drill pipe 2 with a central conveying channel 3 and an air channel 4 arranged on its circumference and is therefore also referred to as a two-way drill pipe.
  • a connector 5 is attached, preferably welded.
  • the Connector 5 is screwed from below a conventional countersink drill head 6 with its central connector 7, which has a compressed air supply opening 8 through which the countersink drill head 6 is supplied with compressed air for driving its hammer drill bit 9.
  • the diameter of the percussion drill bit 9 is larger than that of the drill pipe 2 and also larger than the diameter of the drive part of the countersink drill head 6.
  • a conveying duct section 10 runs obliquely downward from the central conveying duct 3 of the drill pipe 2 to a lateral inlet opening 11.
  • the air channel 4 of the drill pipe 2 opens into an end groove 12 of the connecting piece 5 concentrically surrounding the upper opening of the conveying channel section 10. From an circumferential point of this groove 12, which acts as an annular collecting channel, an air channel section 13 runs obliquely downward to the central connecting piece 7 of the drilling head 6 it can be seen from the drawing that the air duct section 13 runs approximately parallel to the conveying duct section 10.
  • An apron 14 which is open at the bottom is attached to the connecting piece 5.
  • This apron 14 is formed by a downwardly open tube which is screwed onto the connecting piece 5 and is offset eccentrically relative to the countersink drill head 6 on the side of the inlet opening 11.
  • an inflow opening 15 is formed on the side of this inlet opening 11 at a short distance above the percussion drill bit 9, which is connected via the delivery channel section 10 to the delivery channel 3 in the drill pipe 2.
  • the compressed air flows through the air duct section 13 and the compressed air supply opening 8 of the central connector 7 in the Senkhammer-Bohrkopf 6 and drives the percussion drill bit 9 to striking movements.
  • the entire drill pipe 1 with the hanging hammer drill head 6 attached to it is rotated by the supporting drill.
  • the compressed air emerges downward from the percussion drill bit 9 through air ducts 16 indicated in dashed lines in the drawing and takes the resulting cuttings in the water-filled borehole into the opening 15 of the apron 14.
  • the drilling cuttings are entrained by the water-air mixture flowing upward in the apron 14, the conveying duct section 10 and the conveying duct 3 and transported upwards.
  • Fig. 2 it is indicated that the drill pipe 2 is sealed from the borehole opening.
  • the borehole opening is lined with a casing 17 which is movably sealed with respect to the drill pipe 2 by means of a sliding seal 18.
  • a supply line 20 for compressed air and / or water which is only schematically indicated in FIG. 2, opens into the intermediate space 19 between the drill pipe 2 and the borehole opening. As a result, a pressure can be maintained in this intermediate space 19, which supports the conveyance of the cuttings into the apron 14. If there is still no water in the borehole in the initial section of a borehole, water can be supplied via the line 20, which is required for the transportation of the cuttings by means of a lifting action by means of the compressed air.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Earth Drilling (AREA)

Abstract

PCT No. PCT/EP94/00887 Sec. 371 Date Sep. 29, 1995 Sec. 102(e) Date Sep. 29, 1995 PCT Filed Mar. 22, 1994 PCT Pub. No. WO94/23175 PCT Pub. Date Oct. 13, 1994A drilling column has a percussive drilling head attached to a lower end thereof. The drilling column includes a skirt extending downwardly from a lower end thereof in surrounding relationship to the drilling head. The skirt is disposed in eccentric relationship to the drilling head, so that an enlarged space is formed at one side of the drilling head. An air duct arrangement extends through the drilling column for supplying compressed air to the drilling head. That compressed air exits the drilling head through a front face thereof and then flows upwardly through the enlarged space in the skirt and then travels through a discharge channel arrangement formed in the drilling column. In that way, cuttings entrained in the compressed air are removed upwardly from the drill hole. The drilling column is sealed-off with respect to the upper open end of the drill hole by a chuck pipe, enabling compressed air or liquid to be introduced from above ground into a gap surrounding the drilling column.

Description

Bohrgestänge mit Senkhammer-BohrkopfDrill pipe with a countersunk hammer drill head
Die Erfindung betrifft ein Bohrgestänge mit einem Luftkanal zur Zufuhr von Preßluft zu einem Senkhammer- Bohrkopf, der an seinem unteren Ende eine Schlagbohrkrone und an seinem oberen Ende ein zentrisches Anschlußstück mit einer Preßluft-Zufuhröffnung aufweist.The invention relates to a drill pipe with an air duct for supplying compressed air to a Senkhammer drill head, which has a percussion drill bit at its lower end and a central connector with a compressed air supply opening at its upper end.
Bei der Verwendung von Senkhammer-Bohrköpfen befindet sich der durch Preßluft angetriebene Senkhammer an der tiefsten Stelle im Bohrloch. Die zum Hammerantrieb erforderliche Preßluft wird durch das als einfaches Bohrrohr ausgeführte Bohrgestänge zugeführt. Die Preßluft tritt an der Schlagbohrkrone aus und strömt im Zwischenraum zwischen der Bohrlochwandung und dem Bohrgestänge nach oben, wobei das beim Bohren anfallende Bohrklein nach oben gefördert wird.When using a hammer drill, the pneumatic hammer is at the lowest point in the borehole. The compressed air required for the hammer drive is supplied through the drill pipe designed as a simple drill pipe. The compressed air emerges from the percussion drill bit and flows upwards in the space between the borehole wall and the drill pipe, the cuttings generated during drilling being conveyed upwards.
Um eine für die Aufrechterhaltung der Förderwirkung ausreichende Strömungsgeschwindigkeit zu erreichen und aufrechtzuerhalten, müssen sehr große Preßluftmengen zugeführt werden. Beispielsweise ist es erforderlich, bei einem Bohrungsdurchmesser von etwa 380 mm und einem Bohrrohrdurchmesser von etwa 150 mm etwa 25-30 m3 Preßluft einzusetzen; damit wird die erforderliche Strömungsgeschwindigkeit von etwa 30 m/sec im Ringraum zwischen dem Bohrrohr und der Bohrungswandung erreicht. Hierfür sind Kompressoren sehr hoher Leistung erforderlich, die demzufolge einen sehr hohen Energiebedarf von beispielsweise 100 1 Dieselkraftstoff pro Stunde haben. Der Betrieb der Dieselmotoren für den Antrieb der Kompressoren stellt eine erhebliche Umweltbelastung dar. Aufgabe der Erfindung ist es daher, ein Bohrgestänge mit einem Senkhammer-Bohrkopf der eingangs genannten Gattung so auszugestalten, daß unter Verwendung herkömmlicher Senkhammer-Bohrköpfe eine wesentliche Verringerung des Energiebedarfs erreicht wird.In order to achieve and maintain a flow rate sufficient to maintain the delivery effect, very large amounts of compressed air must be supplied. For example, it is necessary to use about 25-30 m 3 of compressed air with a bore diameter of about 380 mm and a drill pipe diameter of about 150 mm; the required flow velocity of about 30 m / sec in the annular space between the drill pipe and the bore wall is thus achieved. This requires compressors of very high power, which consequently have a very high energy requirement of, for example, 100 liters of diesel fuel per hour. The operation of the diesel engines for driving the compressors represents a considerable environmental burden. The object of the invention is therefore to design a drill pipe with a countersink drill head of the type mentioned in such a way that a substantial reduction in the energy requirement is achieved using conventional countersink drill heads.
Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß das Bohrgestänge aus einem Bohrrohr mit einem zentrischen Förderkanal besteht, an dessen Umfang der Luftkanal angeordnet ist, daß zwischen dem unteren Ende des Bohrrohrs und dem Anschlußstück des Senkhammer-Bohrkopfes ein Verbindungsstück angebracht ist, das einen vom zentrischen Förderkanal des Bohrrohrs zu einer seitlichen Eintrittsöffnung verlaufenden Förderkanalabschnitt und mindestens einen vom Luftkanal des Bohrrohrs zum zentrischen Anschlußstück des Senkhammer-Bohrkopfes verlaufenden Luftkanalabschnitt aufweist, und daß im Bereich der seitlichen Eintrittsöffnung des Verbindungstücks eine nach unten offene Schürze angeordnet ist.This object is achieved in that the drill string consists of a drill pipe with a central delivery channel, on the circumference of which the air channel is arranged, that a connector is attached between the lower end of the drill pipe and the connector of the Senkhammer drill head, one from the central Has conveying channel of the drill pipe to a lateral inlet opening and at least one air channel section running from the air channel of the drill pipe to the central connecting piece of the Senkhammer drill head, and that an apron which is open at the bottom is arranged in the region of the lateral inlet opening of the connecting piece.
Die Verwendung eines an sich bekannten Zweiwege-Bohrrohrs ermöglicht es, den zentrischen Förderkanal des Bohrrohrs zum Abtransport des Bohrkleins mittels der eingebrachten Preßluft zu verwenden. Da der Durchtrittsguerschnitt dieses zentrischen Förderkanals wesentlich geringer ist als der des Ringraums zwischen dem Bohrrohr und der Bohrungswandung wird eine für den Fördervorgang erforderliche ausreichende Strömungsgeschwindigkeit bereits mit einer wesentlich geringeren Preßluftmenge erreicht. Beispielsweise kann die Preßluftmenge und damit auch der Energiebedarf auf die Hälfte gegenüber dem herkömmlichen Verfahren verringert werden. Dadurch wird auch eine wesentliche Schonung der Umwelt erreicht.The use of a known two-way drill pipe makes it possible to use the central conveying channel of the drill pipe to remove the cuttings by means of the compressed air introduced. Since the passage cross section of this central conveying channel is substantially smaller than that of the annular space between the drill pipe and the bore wall, a sufficient flow rate required for the conveying process is already achieved with a substantially smaller amount of compressed air. For example, the amount of compressed air and thus also the energy requirement can be reduced by half compared to the conventional method. This also helps to protect the environment.
Die für den Antrieb des Senkhammer-Bohrkopfes erforderliche Preßluft wird innerhalb des Verbindungstückes von dem am Umfang mündenden Luftkanal nach unten zu dem zentrischen Anschlußstück des Senkhammer-Bohrkopfes geleitet. Damit wird erreicht, daß der Senkhammer-Bohrkopf weiterhin zentrisch am Bohrgestänge angebracht ist, was aus Gründen der Krafteinleitung erforderlich ist, und daß die Preßluftzufuhr weiterhin zentrisch am Anschlußstück erfolgt, so daß konstruktive Änderungen am Senkhammer- Bohrkopf nicht erforderlich sind. Deshalb können die herkömmlichen Senkhammer-Bohrköpfe unverändert verwendet werden.The compressed air required to drive the Senkhammer drill head is within the Connection piece passed from the air duct opening on the circumference down to the central connector of the Senkhammer drilling head. This ensures that the Senkhammer drill head is still mounted centrally on the drill string, which is necessary for reasons of force, and that the compressed air supply continues to be centered on the connector, so that design changes to the Senkhammer drill head are not required. Therefore, the conventional Senkhammer drill heads can be used unchanged.
Die am Anschlußstück dicht angebrachte, den Antriebsteil des Senkhammer-Bohrkopfes umgebende Schürze ist in erster Linie im Bereich unterhalb der seitlichen Eintrittsöffnung des Verbindungsstücks nach unten geöffnet, um das beim Bohren anfallende Bohrklein unmittelbar oberhalb der Schlagbohrkrone aufzunehmen. Die üblicherweise im Bohrloch anstehende Wassersäule drückt das Bohrklein mit der Preßluft in die unten offene Schürze, von wo es in einem im wesentlichen unbehinderten Strömungskanal in den zentrischen Förderkanal des Bohrrohrs gelangt und nach oben gefördert wird.The apron, which is tightly attached to the connecting piece and surrounds the drive part of the countersink drill head, is primarily open in the area below the lateral inlet opening of the connecting piece, in order to receive the cuttings that occur during drilling immediately above the percussion drill bit. The water column, which is usually present in the borehole, presses the cuttings with the compressed air into the apron, which is open at the bottom, from where it reaches the central production channel of the drill pipe in an essentially unobstructed flow channel and is conveyed upwards.
((
Gemäß einer besonders bevorzugten Ausführungsform der Erfindung ist vorgesehen, daß die Schürze ein mit dem Verbindungsstück verbundenes, nach unten offenes Rohr ist, das gegenüber dem Senkhammer-Bohrkopf zur Seite der Eintrittssöffnung hin exzentrisch versetzt ist. Dadurch wird erreicht, daß der Eintrittsquerschnitt in die Schürze unterhalb der Eintrittsöffnung des Verbindungsstücks am größten ist, wobei der gesamte zur Verfügung stehende Zwischenraum zwischen dem Senkhammer und der Bohrlochwandung ausgenützt werden kann. Dadurch können auch verhältnismäßig große Stücke des Bohrkleins ohne Schwierigkeiten weggefördert werden. Gemäß einer weiteren vorteilhaften Ausgestaltung des Erfindungsgedankens ist vorgesehen, daß das Bohrrohr gegenüber der Bohrlochöffnung abgedichtet ist und der Zwischenraum zwischen dem Bohrrohr und der Bohrlochöffnung an eine Zufuhrleitung für Preßluft und/oder Wasser angeschlossen ist. Auf diese Weise ist es möglich, in dem das Bohrrohr umgebenden Ringraum einen erhöhten Druck aufrechtzuerhalten, der das Einströmen des mit Wasser und Preßluft vermischten Bohrkleins in die Schürze sowie den Fördervorgang unterstützt. Die Zufuhr von Wasser in den abgedichteten Zwischenraum kann besonders zu Anfang eines Bohrvorgangs zweckmäßig sein, wenn im Bohrloch noch kein Grundwasser ansteht.According to a particularly preferred embodiment of the invention, it is provided that the apron is a tube which is connected to the connecting piece and is open at the bottom and which is offset eccentrically with respect to the countersink drill head on the side of the inlet opening. It is thereby achieved that the entry cross section into the apron is greatest below the entry opening of the connecting piece, whereby the entire available space between the sink hammer and the borehole wall can be used. As a result, even relatively large pieces of cuttings can be transported away without difficulty. According to a further advantageous embodiment of the inventive concept, it is provided that the drill pipe is sealed off from the borehole opening and the space between the drill pipe and the borehole opening is connected to a supply line for compressed air and / or water. In this way it is possible to maintain an increased pressure in the annular space surrounding the drill pipe, which supports the inflow of the cuttings mixed with water and compressed air into the apron and the conveying process. The supply of water into the sealed intermediate space can be particularly useful at the beginning of a drilling process when there is no groundwater in the borehole.
Weitere vorteilhafte Ausgestaltungen des Erfindungsgedankens sind Gegenstand weiterer Unteransprüche.Further advantageous embodiments of the inventive concept are the subject of further dependent claims.
Nachfolgend werden Ausführungsbeispiele der Erfindung näher erläutert, die in der Zeichnung dargestellt sind. Es zeigt:Exemplary embodiments of the invention are illustrated below, which are shown in the drawing. It shows:
Fig. 1 einen Längsschnitt durch einen Senkhammer-Bohrkopf am unteren Ende eines Bohrgestänges undFig. 1 shows a longitudinal section through a countersink drill head at the lower end of a drill string and
Fig. 2 einen Längsschnitt durch einen in einem Bohrloch angeordneten Senkhammer-Bohrkopf mit Bohrgestänge.Fig. 2 shows a longitudinal section through a countersink drill head arranged in a borehole with drill pipe.
Das bei den dargestellten Ausführungsbeispielen verwendete, von einem (nicht dargestellten) Bohrgerät getragene Bohrgestänge 1, besteht aus einem Bohrrohr 2 mit einem zentrischen Förderkanal 3 und einem an dessen Umfang angeordneten Luftkanal 4 und wird deshalb auch als Zweiwege-Bohrgestänge bezeichnet.The drill pipe 1 used in the exemplary embodiments shown and carried by a drilling device (not shown) consists of a drill pipe 2 with a central conveying channel 3 and an air channel 4 arranged on its circumference and is therefore also referred to as a two-way drill pipe.
Am unteren Ende des Bohrrohrs 2 ist ein Verbindungsstück 5 angebracht, vorzugsweise angeschweißt. In das Verbindungsstück 5 ist von unten ein herkömmlicher Senkhammer-Bohrkopf 6 mit seinem zentrischen Anschlußstück 7 eingeschraubt, das eine Preßluft-Zufuhröffnung 8 aufweist, durch die der Senkhammer-Bohrkopf 6 zum Antrieb seiner Schlagbohrkrone 9 mit Preßluft versorgt wird. Der Durchmesser der Schlagbohrkrone 9 ist größer als der des Bohrrohrs 2 und auch größer als der Durchmesser des Antriebsteils des Senkhammer-Bohrkopfes 6.At the lower end of the drill pipe 2, a connector 5 is attached, preferably welded. In the Connector 5 is screwed from below a conventional countersink drill head 6 with its central connector 7, which has a compressed air supply opening 8 through which the countersink drill head 6 is supplied with compressed air for driving its hammer drill bit 9. The diameter of the percussion drill bit 9 is larger than that of the drill pipe 2 and also larger than the diameter of the drive part of the countersink drill head 6.
Im Verbindungsstück 5 verläuft ein Förderkanalabschnitt 10 vom zentrischen Förderkanal 3 des Bohrrohrs 2 schräg nach unten zu einer seitlichen Eintrittsöffnung 11.In the connecting piece 5, a conveying duct section 10 runs obliquely downward from the central conveying duct 3 of the drill pipe 2 to a lateral inlet opening 11.
Der Luftkanal 4 des Bohrrohrs 2 mündet in einer die obere Öffnung des Förderkanalabschnitts 10 konzentrisch umgebenden stirnseitigen Nut 12 des Verbindungsstücks 5. Von einer Umfangsstelle dieser als ringförmiger Sammelkanal wirkenden Nut 12 verläuft ein Luftkanalabschnitt 13 schräg nach unten zum zentrischen Anschlußstück 7 des Bohrkopfs 6. Wie man aus der Zeichnung erkennt, verläuft der Luftkanalabschnitt 13 angenähert parallel zum Förderkanalabschnitt 10.The air channel 4 of the drill pipe 2 opens into an end groove 12 of the connecting piece 5 concentrically surrounding the upper opening of the conveying channel section 10. From an circumferential point of this groove 12, which acts as an annular collecting channel, an air channel section 13 runs obliquely downward to the central connecting piece 7 of the drilling head 6 it can be seen from the drawing that the air duct section 13 runs approximately parallel to the conveying duct section 10.
Am Verbindungsstück 5 ist eine nach unten offene Schürze 14 angebracht. Diese Schürze 14 wird von einem nach unten offenen Rohr gebildet, das am Verbindungsstück 5 angeschraubt ist und gegenüber dem Senkhammer-Bohrkopf 6 zur Seite der Eintrittsöffnung 11 hin exzentrisch versetzt ist. Dadurch wird auf der Seite dieser Eintrittsöffnung 11 in geringem Abstand oberhalb der Schlagbohrkrone 9 eine Einströmöffnung 15 gebildet, die über den Förderkanalabschnitt 10 mit dem Förderkanal 3 im Bohrrohr 2 verbunden ist.An apron 14 which is open at the bottom is attached to the connecting piece 5. This apron 14 is formed by a downwardly open tube which is screwed onto the connecting piece 5 and is offset eccentrically relative to the countersink drill head 6 on the side of the inlet opening 11. As a result, an inflow opening 15 is formed on the side of this inlet opening 11 at a short distance above the percussion drill bit 9, which is connected via the delivery channel section 10 to the delivery channel 3 in the drill pipe 2.
Wie in Fig. 2 mit Pfeilen angedeutet ist, strömt die Preßluft durch den Luftkanalabschnitt 13 und die Preßluft- Zufuhröffnung 8 des zentrischen Anschlußstücks 7 in den Senkhammer-Bohrkopf 6 und treibt die Schlagbohrkrone 9 zu Schlagbewegungen an. Zugleich wird das gesamte Bohrgestänge 1 mit dem daran hängenden Senkhammer-Bohrkopf 6 durch das tragende Bohrgerät gedreht.As indicated in Fig. 2 with arrows, the compressed air flows through the air duct section 13 and the compressed air supply opening 8 of the central connector 7 in the Senkhammer-Bohrkopf 6 and drives the percussion drill bit 9 to striking movements. At the same time, the entire drill pipe 1 with the hanging hammer drill head 6 attached to it is rotated by the supporting drill.
Die Preßluft tritt durch in der Zeichnung gestrichelt angedeuteter Luftkanäle 16 nach unten aus der Schlagbohrkrone 9 aus und nimmt das anfallende Bohrklein im wassergefüllten Bohrloch in die Öffnung 15 der Schürze 14 mit. Durch das in der Schürze 14, dem Förderkanalabschnitt 10 und dem Förderkanal 3 nach oben strömende Wasser-Luft-Gemisch wird das Bohrklein mitgerissen und nach oben transportiert.The compressed air emerges downward from the percussion drill bit 9 through air ducts 16 indicated in dashed lines in the drawing and takes the resulting cuttings in the water-filled borehole into the opening 15 of the apron 14. The drilling cuttings are entrained by the water-air mixture flowing upward in the apron 14, the conveying duct section 10 and the conveying duct 3 and transported upwards.
In Fig. 2 ist angedeutet, daß das Bohrrohr 2 gegenüber der Bohrlochöffnung abgedichtet ist. Hierzu ist die Bohrlochöffnung mit einem Futterrohr 17 ausgekleidet, das über eine Gleitdichtung 18 gegenüber dem Bohrrohr 2 beweglich abgedichtet ist.In Fig. 2 it is indicated that the drill pipe 2 is sealed from the borehole opening. For this purpose, the borehole opening is lined with a casing 17 which is movably sealed with respect to the drill pipe 2 by means of a sliding seal 18.
In den Zwischenraum 19 zwischen dem Bohrrohr 2 und der Bohrlochöffnung mündet eine in Fig. 2 nur schematisch angedeutete Zufuhrleitung 20 für Preßluft und/oder Wasser. Dadurch kann in diesem Zwischenraum 19 ein Druck aufrechterhalten werden, der die Förderung des Bohrkleins in die Schürze 14 hinein unterstützt. Wenn im Anfangsabschnitt einer Bohrung noch kein Wasser im Bohrloch ansteht, kann über die Leitung 20 Wasser zugeführt werden, das für den Transport des Bohrkleins durch Heberwirkung mittels der Preßluft erforderlich ist.A supply line 20 for compressed air and / or water, which is only schematically indicated in FIG. 2, opens into the intermediate space 19 between the drill pipe 2 and the borehole opening. As a result, a pressure can be maintained in this intermediate space 19, which supports the conveyance of the cuttings into the apron 14. If there is still no water in the borehole in the initial section of a borehole, water can be supplied via the line 20, which is required for the transportation of the cuttings by means of a lifting action by means of the compressed air.
Da der Leitungsquerschnitt des Förderkanals über die gesamte Länge der Bohrung gleichmäßig klein ist, kann eine ausreichend hohe Fördergeschwindigkeit bereits mit der Preßluftmenge aufrechterhalten werden, die für den Schlagantrieb des Senkhammer-Bohrkopfes 6 erforderlich ist. Es besteht keine Notwendigkeit, unter zusätzlichem Energieaufwand eine zusätzliche Preßluftmenge zuzuführen, die ausschließlich der Förderung des Bohrkleins dient.Since the line cross-section of the conveying channel is uniformly small over the entire length of the bore, a sufficiently high conveying speed can already be maintained with the amount of compressed air that is required for the percussion drive of the sinking hammer drill head 6. There is no need for additional To supply energy an additional amount of compressed air that is used only to promote the cuttings.
Da eine ausreichende Förderwirkung für das Bohrklein unter allen Betriebsbedingungen aufrechterhalten wird, bleibt die Bohrsohle sauber, weil kein in der Schwebe befindliches Bohrklein nach unten fallen kann. Dadurch wird die Bohrwirkung der Schlagbohrkrone 9 verbessert. As sufficient drilling fluid support is maintained under all operating conditions, the bottom of the drill remains clean because no suspended cuttings can fall down. This improves the drilling effect of the percussion drill bit 9.

Claims

Bohrgestänge mit Senkhammer-BohrkopfP a t e n t a n s p r ü c h e Drill pipe with countersink drill head patent claims
1. Bohrgestänge (1) mit einem Luftkanal (4) zur Zufuhr von Preßluft zu einem Senkhammer-Bohrkopf (6), der an seinem unteren Ende eine Schlagbohrkrone (9) und an seinem oberen Ende ein zentrisches Anschlußstück (7) mit einer Preßluft- Zufuhröffnung (8) aufweist, dadurch gekennzeichnet, daß das Bohrgestänge (1) aus einem Bohrrohr (2) mit einem zentrischen Förderkanal (3) besteht, an dessen Umfang der Luftkanal (4) angeordnet ist, daß zwischen dem unteren Ende des Bohrrohrs (2) und dem Anschlußstück (7) des Senkhammer-Bohrkopfes (6) ein Verbindungsstück (5) angebracht ist, das einen vom zentrischen Förderkanal (3) des Bohrrohrs (2) zu einer seitlichen Eintrittssöffnung (11) verlaufenden Förderkanalabschnitt (10) und mindestens einen vom Luftkanal (4) des Bohrrohrs (2) zum zentrischen Anschlußstück (7) des Senkhammer-Bohrkopfes (6) verlaufenden Luftkanalabschnitt (13) aufweist und daß im Bereich der seitlichen Eintrittsöffnung (11) des Verbindungsstücks (5) eine nach unten offene Schürze (14) angeordnet ist.1. drill pipe (1) with an air duct (4) for supplying compressed air to a Senkhammer boring head (6) having a hammer drill bit (9) at its lower end and a central connector (7) with a compressed air at its upper end Feed opening (8), characterized in that the drill pipe (1) consists of a drill pipe (2) with a central delivery channel (3), on the circumference of which the air channel (4) is arranged, that between the lower end of the drill pipe (2 ) and the connecting piece (7) of the Senkhammer drilling head (6) a connecting piece (5) is attached, one of the central delivery channel (3) of the drill pipe (2) to a lateral inlet opening (11) extending delivery channel section (10) and at least one from the air duct (4) of the drill pipe (2) to the central connecting piece (7) of the Senkhammer boring head (6) extending air duct section (13) and that in the area of the lateral inlet opening (11) of the connecting piece (5) one after u nten open apron (14) is arranged.
2. Bohrgestänge mit Senkhammer-Bohrkopf nach Anspruch 1, dadurch gekennzeichnet, daß der Förderkanalabschnitt (10) im Verbindungsstück (5) vom zentrischen Förderkanal (3) des Bohrrohrs (2) schräg nach unten zur seitlichen Eintrittsöffnung (11) verläuft.2. drill pipe with a hammer drill head according to claim 1, characterized in that the conveying channel section (10) in the connecting piece (5) from the central conveying channel (3) of the drill pipe (2) extends obliquely downward to the lateral inlet opening (11).
3. Bohrgestänge mit Senkhammer-Bohrkopf nach Anspruch 1, dadurch gekennzeichnet, daß der Luftkanalabschnitt (13) von einer die obere Öffnung des Förderkanalabschnitts (10) konzentrisch umgebenden stirnseitigen Nut (12) zum zentrischen Anschlußstück (7) des Bohrkopfs (6) verläuft.3. drill pipe with a hammer drill head according to claim 1, characterized in that the air duct section (13) from one of the upper opening of the conveying duct section (10) concentrically surrounding end groove (12) to the central connector (7) of the drill head (6).
4. Bohrgestänge mit Senkhammer-Bohrkopf nach Anspruch 2, dadurch gekennzeichnet, daß der Luftkanalabschnitt (13) im Verbindungsstück (5) angenähert parallel zum Förderkanalabschnitt (10) verläuft.4. drill pipe with a hammer drill head according to claim 2, characterized in that the air duct section (13) in the connecting piece (5) runs approximately parallel to the conveying duct section (10).
5. Bohrgestänge mit Senkhammer-Bohrkopf nach Anspruch 1, dadurch gekennzeichnet, daß die Schürze (14) ein mit dem Verbindungsstück (5) verbundenes, nach unten offenes Rohr ist, das gegenüber dem Senkhammer-Bohrkopf (6) zur Seite der Eintrittsöffnung (11) hin exzentrisch versetzt ist.5. drill pipe with countersink drill head according to claim 1, characterized in that the apron (14) is connected to the connecting piece (5), downwardly open tube which is opposite the countersink drill head (6) to the side of the inlet opening (11th ) is offset eccentrically.
6. Bohrgestänge mit Senkhammer-Bohrkopf nach Anspruch 1, dadurch gekennzeichnet, daß das Bohrrohr (2) gegenüber der Bohrlochöffnung abgedichtet ist und der Zwischenraum (19) zwischen dem Bohrrohr (2) und der Bohrlochöffnung an eine6. drill pipe with a hammer drill head according to claim 1, characterized in that the drill pipe (2) is sealed against the borehole opening and the space (19) between the drill pipe (2) and the borehole opening to one
' Zufuhrleitung (20) für Preßluft und/oder Wasser angeschlossen ist. ' Supply line (20) for compressed air and / or water is connected.
7. Bohrgestänge mit Senkhammer-Bohrkopf nach Anspruch 6, dadurch gekennzeichnet, daß die Bohrlochöffnung mit einem Futterrohr (17) ausgekleidet ist, das über eine Gleitdichtung (18) gegenüber dem Bohrrohr (2) abgedichtet ist. 7. drill pipe with a hammer drill head according to claim 6, characterized in that the borehole opening is lined with a casing (17) which is sealed with a sliding seal (18) against the drill pipe (2).
EP94912494A 1993-04-02 1994-03-22 Drilling apparatus with drill string and percussion hammer drilling head Expired - Lifetime EP0690953B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4310726A DE4310726A1 (en) 1993-04-02 1993-04-02 Drill pipe with countersunk hammer drill head
DE4310726 1993-04-02
PCT/EP1994/000887 WO1994023175A1 (en) 1993-04-02 1994-03-22 Drilling column with sledgehammer drilling head

Publications (2)

Publication Number Publication Date
EP0690953A1 true EP0690953A1 (en) 1996-01-10
EP0690953B1 EP0690953B1 (en) 1997-10-15

Family

ID=6484496

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94912494A Expired - Lifetime EP0690953B1 (en) 1993-04-02 1994-03-22 Drilling apparatus with drill string and percussion hammer drilling head

Country Status (6)

Country Link
US (1) US5590725A (en)
EP (1) EP0690953B1 (en)
AT (1) ATE159320T1 (en)
DE (2) DE4310726A1 (en)
ES (1) ES2110229T3 (en)
WO (1) WO1994023175A1 (en)

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DE10361080A1 (en) 2003-12-22 2005-07-28 Blickhan, Elisabeth Charlotte drilling
DE102005026921A1 (en) * 2005-06-10 2006-12-21 Geomechanik Wasser- Und Umwelttechnik Gmbh Hammer-drilling arrangement for drilling purposes comprises a hammer-drill head, a flushing medium supply unit, a drill pipe with a conveying channel for the drillings and an overlaying pipe connected to a drilling crown
ATE369481T1 (en) * 2005-06-10 2007-08-15 Geomechanik Wasser Und Umweltt COUNTERSUNK HAMMER DRILLING APPARATUS AND METHOD
GB2454900B (en) * 2007-11-22 2012-01-11 Schlumberger Holdings Self-circulating drill bit
CN105041246B (en) * 2015-02-26 2018-01-12 徐州徐工基础工程机械有限公司 A kind of reverse circulation down-hole hammer transformational structure

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Title
See references of WO9423175A1 *

Also Published As

Publication number Publication date
WO1994023175A1 (en) 1994-10-13
ES2110229T3 (en) 1998-02-01
US5590725A (en) 1997-01-07
ATE159320T1 (en) 1997-11-15
DE59404351D1 (en) 1997-11-20
DE4310726A1 (en) 1994-10-06
EP0690953B1 (en) 1997-10-15

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