EP0291925B1 - Borehole closure plug - Google Patents

Borehole closure plug Download PDF

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Publication number
EP0291925B1
EP0291925B1 EP88107872A EP88107872A EP0291925B1 EP 0291925 B1 EP0291925 B1 EP 0291925B1 EP 88107872 A EP88107872 A EP 88107872A EP 88107872 A EP88107872 A EP 88107872A EP 0291925 B1 EP0291925 B1 EP 0291925B1
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EP
European Patent Office
Prior art keywords
head
closure
inlet
outlet
borehole
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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EP88107872A
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German (de)
French (fr)
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EP0291925A1 (en
Inventor
Klaus Gerstenberg
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Thermoplast & Apparatebau GmbH
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Thermoplast & Apparatebau GmbH
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Priority to AT88107872T priority Critical patent/ATE85400T1/en
Publication of EP0291925A1 publication Critical patent/EP0291925A1/en
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Publication of EP0291925B1 publication Critical patent/EP0291925B1/en
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    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21BEARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B33/00Sealing or packing boreholes or wells
    • E21B33/10Sealing or packing boreholes or wells in the borehole
    • E21B33/12Packers; Plugs
    • E21B33/127Packers; Plugs with inflatable sleeve

Definitions

  • the invention relates to an expandable, lost closure plug for boreholes to be filled with liquid under pressure for rock solidification in underground mining with an elastic, tubular, derived from the liquid pressure automatically tensioning against the borehole wall, extending between an inlet and an outlet head, the rigid piece Surrounds spacer between the inlet and outlet head, wherein a flow channel for the liquid extends through the inlet and outlet head and continues in the spacer up to a mouth in the area between the closure piece and the spacer.
  • a borehole closure of this type is known from DE-C-30 14 834.
  • the spacer is tubular and thus represents a direct connection between the flow channels in the inlet and outlet heads.
  • the preloading the valve at the outlet head is greater than the preload of the valve at the inlet head, so that when the pressurized liquid flows into the spacer, the liquid flows through the orifices in the spacer also penetrates into the space between the spacer and the closure piece and a total pressure builds up in the interior of the closure plug before opening the valve on the outlet head, which spreads the closure piece and presses it firmly against the borehole wall.
  • the borehole closure is preferably made of plastic.
  • it In order to enable a secure jamming of the sealing plug, it must have a certain minimum length - also taking into account an irregular borehole surface.
  • the borehole closure must withstand a pressure of 60 to 90 bar.
  • the spacer is also exposed to a correspondingly high pressure load. It has now been shown in practice that, starting from the usual borehole diameters of approximately 42 to 44 mm and the required axial length of the borehole closure and the resulting ratio of diameter and length, a tubular spacer of sufficient strength as an inexpensive plastic injection-molded part can hardly be produced in terms of production technology is.
  • pumps are used in the pressing of plastic components as conveying means, which feed the individual components to the borehole closure in separate pump cylinders and separate lines in order to prevent a premature reaction.
  • a process-specific reaction for example of the components of polyurethane, is an intensive one Assuming mixing, an additional mixer must be installed upstream of the borehole plug.
  • the invention has for its object to design the sealing plug described in such a way that on the one hand the intensive mixing of the plastic components in the sealing plug itself can take place without additional cost, so that separate mixing devices to be arranged between the pumps and the sealing plug can be dispensed with, and the spacer as simple plastic injection molded part in a design that meets all requirements should be retained.
  • the liquid comprising the plastic components and pressed through the sealing plug into the borehole undergoes a multiple deflection.
  • Even the double deflection following the inlet head corresponds to the function of a conventional swirler.
  • the double redirection in front of the outlet head further intensifies the homogeneous mixing of the plastic components.
  • the plug thus also takes on the function of the otherwise usual mixing device and comes in the intensity of the mixing effect the usual Swirl immediately, without the sealing plug even having an additional component.
  • the spacer can be made solid over the major part of its length, so that the injection-molding problems during manufacture are eliminated and the spacer is able to withstand all loads that occur .
  • An expedient embodiment consists in that the channels in the spacer initially extend from its ends in its longitudinal direction and then merge into a mouth section angled with respect to this longitudinal direction, a further expedient embodiment consisting in that the mouth section each crosswise through one in the spacer whose longitudinal direction arranged opening is formed.
  • the borehole closure designated as a whole by 10, comprises an expandable closure piece 16, which is arranged between two valve heads, designated as inlet head 12 and outlet head 14, and which is designed as a high-pressure-resistant rubber hose, the diameter of which, when unloaded, is slightly smaller than the diameter of the borehole to be closed, the diameter of the borehole for example, can be 45 mm.
  • the two valve heads 12 and 14 consist essentially of basic bodies 18 and 20 which are rotationally symmetrical with respect to the hose axis and which are traversed by a central channel 22 and 24.
  • the base bodies 18 and 20 each have a tubular section 26 and 28 which is provided with an internal thread 30 and 32 and in which the end of a spacer provided with a corresponding external thread 34 and 36 38 is screwed in, which serves to hold the two valve heads 12 and 14 at a predetermined distance, in which the closure piece 16 is stretched so that it can be easily inserted into the borehole by means of a feed pipe or hose.
  • the end sections 44 and 46 of the closure piece 16 are drawn onto the outer surfaces 40 or 42 of the tubular sections 26 and 28, which are overlapped by clamping sleeves 48 and 50 formed on the base bodies 18 and 20.
  • the two valve heads 12 and 14 are designed differently with respect to the valve arrangement depending on the flow direction provided.
  • the foam material to be filled into the borehole must be pressed into the borehole through the borehole closure 10.
  • a filling line 52 is connected to the inlet head 12 adjacent to the mouth of the borehole.
  • the base body 18 is provided in its end section facing away from the closure piece 16 with an internal thread 54, on the inner end of which a shoulder 56 is formed which surrounds a valve opening 59.
  • a seal 58 is arranged on the shoulder 56.
  • a conical valve seat 60 is formed on the other side of the valve opening 59, to which a valve ball 62 is assigned, which is pressed against the valve seat 60 by a compression spring 64.
  • the compression spring 64 is supported on the end of the spacer 38 inserted into the base body 18.
  • a valve opening 66 is also provided on the outlet head 14, again on the downstream one On the side of this valve opening 66, now on the side facing away from the spacer 38, a valve seat 68 is formed, to which a valve ball 70 is assigned, which is pressed against the valve seat 68 by a compression spring 72.
  • the compression spring 72 is supported on a nipple 74 which is screwed into an internal thread 76 which is formed on the end section of the base body 20 which faces away from the closure piece 16.
  • the action of the spring 72 can be adjusted, the force of which is in any case greater than the force of the spring 64 in the inlet head 12, so that in the initial phase of the introduction of the pressurized foam, the closure piece 16 is first spread before the foam can escape into the borehole.
  • the nipple 74 is provided with a bore 78 for the passage of the foam material into the borehole.
  • the spacer 38 is at its two ends 80 and 82 each with a central channel 84 running in the longitudinal direction of the spacer 38 or 86, which extends within the spacer 38 in each case up to an aperture 88 or 90 which diametrically crosses the spacer.
  • These openings 88 and 90 represent the connection between the channels 80 and 82 and the annular space between the closure piece 16 and the spacer 38.
  • the spacer 38 In the area between the two openings 88 and 90, the spacer 38 preferably has a cross-shaped cross-sectional shape, which results in a material saving while maintaining the required rigidity.
  • the described borehole closure 10 has a simple and inexpensive design and can be handled very easily.
  • the borehole plug must be inserted into the borehole with the valve head 14 in front of it, whereupon the connecting line between the pumps and the borehole plug 10 must be connected and removed after the borehole has been filled.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
  • Pressure Vessels And Lids Thereof (AREA)
  • Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)

Abstract

An expandable, lost closure plug (10) for boreholes, to be filled with liquid under pressure, for the stabilization of rock in underground mining is provided with an elastic, tubular closure piece (16) which is automatically restrained against the borehole wall due to the liquid pressure, extends between an inlet head (12) and an outlet head (14) and surrounds a rigid distance piece (38) between inlet head (12) and outlet head (14). Passages (22, 24) running between the inlet head (12) and the outlet head (14) for the liquid extend into the end sections (80, 82) of the distance piece (38) in each case up to an orifice (88, 90) adjacent to the inlet head (12) or the outlet head (14) into the area between the closure piece (16) and the distance piece (38). <IMAGE>

Description

Die Erfindung betrifft einen aufweitbaren, verlorenen Verschlußstopfen für unter Druck mit Flüssigkeit zu verfüllende Bohrlöcher zur Gesteinsverfestigung im Untertagebergbau mit einem elastischen, schlauchförmigen, sich abgeleitet vom Flüssigkeitsdruck selbsttätig gegen die Bohrlochwandung verspannenden, sich zwischen einem Einlaß- und einem Auslaßkopf erstreckenden Verschlußstück, das ein starres Distanzstück zwischen Einlaß- und Auslaßkopf umgibt, wobei sich durch den Einlaß- und Auslaßkopf jeweils ein Strömungskanal für die Flüssigkeit erstreckt und sich im Distanzstück bis zu jeweils einer Ausmündung in den Bereich zwischen dem Verschlußstück und dem Distanzstück fortsetzt.The invention relates to an expandable, lost closure plug for boreholes to be filled with liquid under pressure for rock solidification in underground mining with an elastic, tubular, derived from the liquid pressure automatically tensioning against the borehole wall, extending between an inlet and an outlet head, the rigid piece Surrounds spacer between the inlet and outlet head, wherein a flow channel for the liquid extends through the inlet and outlet head and continues in the spacer up to a mouth in the area between the closure piece and the spacer.

Ein Bohrlochverschluß dieser Art ist aus der DE-C-30 14 834 bekannt. Bei dem bekannten Verschlußstopfen ist das Distanzstück rohrförmig ausgebildet und stellt somit eine direkte Verbindung zwischen den Strömungskanälen im Einlaß- und im Auslaßkopf dar. Im Bereich des Einlaß- und des Auslaßkopfs sind jeweils entgegen der Füllrichtung vorgespannte und sperrende Rückschlagventile vorgesehen, wobei die Vorspannung das Ventils am Auslaßkopf größer ist als die Vorspannung des Ventils am Einlaßkopf, so daß beim Einströmen der unter Druck stehenden Flüssigkeit in das Distanzstück die Flüssigkeit über die Ausmündungen im Distanzstück auch in den Raum zwischen Distanzstück und Verschlußstück eindringt und sich insgesamt im Inneren des Verschlußstopfens vor dem öffnen des Ventlls am Auslaßkopf ein Druck aufbaut, der das Verschlußstück spreizt und fest gegen die Bohrlochwandung preßt.A borehole closure of this type is known from DE-C-30 14 834. In the known sealing plug, the spacer is tubular and thus represents a direct connection between the flow channels in the inlet and outlet heads. In the region of the inlet and outlet heads, non-return valves that are biased and blocking against the filling direction are provided, the preloading the valve at the outlet head is greater than the preload of the valve at the inlet head, so that when the pressurized liquid flows into the spacer, the liquid flows through the orifices in the spacer also penetrates into the space between the spacer and the closure piece and a total pressure builds up in the interior of the closure plug before opening the valve on the outlet head, which spreads the closure piece and presses it firmly against the borehole wall.

Um spätere Beschädigungen von Abbauwerkzeugen und eine Verletzug von Personen durch gegebenenfalls von Abbauwerkzeugen gelöste und von ihnen aus dem Arbeitsbereich geschleuderte Metallstücke zu vermeiden, wird der Bohrlochverschluß vorzugsweise aus Kunststoff gefertigt. Um ein sicheres Verklemmen des Verschlußstopfens zu ermöglichen, muß er - auch unter Berücksichtigung einer unregelmäßigen Bohrlochoberfläche - eine gewisse Mindestlänge aufweisen. Dabei muß der Bohrlochverschluß einem Preßdruck von 60 bis 90 bar standhalten. Auch das Distanzstück ist einer entsprechend hohen Druckbelastung ausgesetzt. Es hat sich nun in der Praxis gezeigt, daß, ausgehend von den üblichen Bohrlochdurchmessern von etwa 42 bis 44 mm und der erforderlichen axialen Länge des Bohrlochverschlusses und des dadurch gegebenen Verhältnisses von Durchmesser und Länge, ein rohrförmiges Distanzstück ausreichender Festigkeit als billiges Kunststoffspritzteil fertigungstechnisch kaum herstellbar ist.In order to avoid later damage to mining tools and injuries to people from metal tools that may have been loosened from mining tools and thrown from the work area by them, the borehole closure is preferably made of plastic. In order to enable a secure jamming of the sealing plug, it must have a certain minimum length - also taking into account an irregular borehole surface. The borehole closure must withstand a pressure of 60 to 90 bar. The spacer is also exposed to a correspondingly high pressure load. It has now been shown in practice that, starting from the usual borehole diameters of approximately 42 to 44 mm and the required axial length of the borehole closure and the resulting ratio of diameter and length, a tubular spacer of sufficient strength as an inexpensive plastic injection-molded part can hardly be produced in terms of production technology is.

Zur Zeit werden bei der Verpressung von Kunststoffkomponenten als Fördermittel Pumpen eingesetzt, welche die einzelnen Komponenten in getrennten Pumpenzylindern und getrennten Leitungen dem Bohrlochverschluß zuführen, um eine vorzeitige Reaktion zu verhindern. Da eine verfahrensspezifische Reaktion beispielsweise der Komponenten von Polyurethan eine intensive Vermischung voraussetzt, muß dem Bohrlochverschluß unbedingt ein zusätzlicher Mischer vorgeschaltet werden.At present, pumps are used in the pressing of plastic components as conveying means, which feed the individual components to the borehole closure in separate pump cylinders and separate lines in order to prevent a premature reaction. Because a process-specific reaction, for example of the components of polyurethane, is an intensive one Assuming mixing, an additional mixer must be installed upstream of the borehole plug.

Der Erfindung liegt die Aufgabe zugrunde, den eingangs beschriebenen Verschlußstopfen derart auszugestalten, daß ohne zusätzlichen Kostenaufwand einerseits die intensive Vermischung der Kunststoffkomponenten im Verschlußstopfen selbst stattfinden kann, so daß gesonderte, zwischen den Pumpen und den Verschlußstopfen anzuordnende Mischvorrichtungen entfallen können, wobei außerdem das Distanzstück als einfaches Kunststoffspritzteil in einer allen Anforderungen gerecht werdenden Ausführung beibehalten werden soll.The invention has for its object to design the sealing plug described in such a way that on the one hand the intensive mixing of the plastic components in the sealing plug itself can take place without additional cost, so that separate mixing devices to be arranged between the pumps and the sealing plug can be dispensed with, and the spacer as simple plastic injection molded part in a design that meets all requirements should be retained.

Die Lösung dieser Aufgabe besteht darin, daß sich die Strömungskanäle des Einlaß- und des Auslaßkopfs im Distanzstück nur in dessen Endabschnitten jeweils bis zu einer dem Einlaß- bzw. Auslaßkopf benachbarten Ausmündung in den Bereich zwischen dem Verschlußstück und dem Distanzstück fortsetzen.The solution to this problem is that the flow channels of the inlet and outlet heads in the spacer continue only in the end sections thereof in each case up to a mouth adjacent to the inlet and outlet heads in the region between the closure piece and the spacer.

Durch diese Ausgestaltung des Verschlußstopfens erfährt die durch den Verschlußstopfen in das Bohrloch gepreßte, die Kunststoffkomponenten umfassende Flüssigkeit eine mehrfache Umlenkung. Bereits die doppelte Umlenkung im Anschluß an den Einlaßkopf entspricht der Funktion eines üblichen Verwirblers. Die erneute doppelte Um-lenkung vor dem Auslaßkopf intensiviert die homogene Durchmischung der Kunststoffkomponenten zusätzlich. Der Verschlußstopfen übernimmt also zugleich die Funktion der sonst üblichen Mischvorrichtung und kommt in der Intensität der Mischwirkung den üblichen Verwirblern gleich, ohne daß der Verschlußstopfen auch nur ein zusätzliches Bauteil aufweist.As a result of this configuration of the sealing plug, the liquid comprising the plastic components and pressed through the sealing plug into the borehole undergoes a multiple deflection. Even the double deflection following the inlet head corresponds to the function of a conventional swirler. The double redirection in front of the outlet head further intensifies the homogeneous mixing of the plastic components. The plug thus also takes on the function of the otherwise usual mixing device and comes in the intensity of the mixing effect the usual Swirl immediately, without the sealing plug even having an additional component.

Da der Strömungsweg der Flüssigkeit zwischen Einlaß- und Auslaßkopf über die Blähkammer zwischen Distanzstück und Verschlußstück geführt wird, kann das Distanzstück über den wesentlichen Teil seiner Länge massiv ausgebildet werden, so daß die spritztechnischen Probleme bei der Fertigung entfallen und das Distanzstück allen auftretenden Belastungen gewachsen ist.Since the flow path of the liquid between the inlet and outlet head is guided over the inflation chamber between the spacer and the closure piece, the spacer can be made solid over the major part of its length, so that the injection-molding problems during manufacture are eliminated and the spacer is able to withstand all loads that occur .

Eine zweckmäßige Ausgestaltung besteht darin, daß sich die Kanäle im Distanzstück von dessen Enden her zunächst in dessen Längsrichtung erstrecken und dann in einen gegenüber dieser Längsrichtung abgewinkelten Mündungsabschnitt übergehen, wobei eine weitere zweckmäßige Ausgestaltung darin besteht, daß der Mündungsabschnitt jeweils durch eine im Distanzstück quer zu dessen Längsrichtung angeordnete Durchbrechung gebildet wird. Dadurch wird der Flüssigkeitsstrom nach dem Einlaßkopf in zwei nach entgegengesetzter Richtung umgelenkte Teilströme aufgeteilt, die sich vor dem Auslaßkopf wieder vereinigen, wodurch eine weitere Verbesserung der Mischwirkung erzielt wird.An expedient embodiment consists in that the channels in the spacer initially extend from its ends in its longitudinal direction and then merge into a mouth section angled with respect to this longitudinal direction, a further expedient embodiment consisting in that the mouth section each crosswise through one in the spacer whose longitudinal direction arranged opening is formed. As a result, the liquid flow after the inlet head is divided into two partial flows which are diverted in the opposite direction and which unite again in front of the outlet head, whereby a further improvement in the mixing effect is achieved.

Weitere zweckmäßige Ausgestaltungen der Erfindung ergeben sich aus den Unteransprüchen in Verbindung mit der nachfolgenden Beschreibung.Further expedient refinements of the invention result from the subclaims in connection with the following description.

Anhand der nachfolgenden Beschreibung eines in der Zeichnung dargestellten Ausführungsbeispiels der Erfindung wird diese näher erläutert.Based on the following description of an embodiment of the invention shown in the drawing, this will be explained in more detail.

Es zeigt:

Fig. 1
einen Längsschnitt durch einen erfindungsgemäßen Verschlußstopfen vor dem Einführen in das Bohrloch,
Fig. 2
eine Seitenansicht dazu in Klemmstellung,
Fig. 3
einen Längsschnitt durch das Distanzstück,
Fig. 4
einen Schnitt nach der Linie IV-IV in Fig. 3 und
Fig. 5
einen Schnitt nach der Linie V-V in Fig. 3.
It shows:
Fig. 1
2 shows a longitudinal section through a plug according to the invention before insertion into the borehole,
Fig. 2
a side view of this in the clamped position,
Fig. 3
a longitudinal section through the spacer,
Fig. 4
a section along the line IV-IV in Fig. 3 and
Fig. 5
a section along the line VV in Fig. 3rd

Der insgesamt mit 10 bezeichnete Bohrlochverschluß umfaßt ein zwischen zwei als Einlaßkopf 12 und Auslaßkopf 14 bezeichneten Ventilköpfen angeordnetes, aufweitbares Verschlußstück 16, welches als hochdruckfester Gummischlauch ausgebildet ist, dessen Durchmesser in unbelastetem Zustand etwas geringer ist, als der Durchmesser des zu verschließenden Bohrlochs, dessen Durchmesser beispielsweise 45 mm betragen kann.The borehole closure, designated as a whole by 10, comprises an expandable closure piece 16, which is arranged between two valve heads, designated as inlet head 12 and outlet head 14, and which is designed as a high-pressure-resistant rubber hose, the diameter of which, when unloaded, is slightly smaller than the diameter of the borehole to be closed, the diameter of the borehole for example, can be 45 mm.

Die beiden Ventilköpfe 12 und 14 bestehen aus im wesentlichen zur Schlauchachse rotationssymmetrischen Grundkörpern 18 bzw. 20, die von einem zentralen Kanal 22 bzw. 24 durchzogen werden. Auf der dem Verschlußstück 16 zugewandten Seite weisen die Grundkörper 18 bzw. 20 jeweils einen rohrförmigen Abschnitt 26 bzw. 28 auf, der mit einem Innengewinde 30 bzw. 32 versehen ist und in welchen das mit einem entsprechenden Außengewinde 34 bzw. 36 versehene Ende eines Distanzstücks 38 eingeschraubt ist, welches dazu dient, die beiden Ventilköpfe 12 und 14 in einem vorgegebenen Abstand zu halten, in welchem das Verschlußstück 16 gestreckt ist, so daß es sich leicht mittels eines Beschickungsrohrs oder eines Schlauchs in das Bohrloch einsetzen läßt. Auf die Außenflächen 40 oder 42 der rohrförmigen Abschnitte 26 bzw. 28 sind die Endabschnitte 44 bzw. 46 des Verschlußstücks 16 aufgezogen, welche von an den Grundkörpern 18 und 20 angeformten Klemmhülsen 48 bzw. 50 übergriffen werden.The two valve heads 12 and 14 consist essentially of basic bodies 18 and 20 which are rotationally symmetrical with respect to the hose axis and which are traversed by a central channel 22 and 24. On the side facing the closure piece 16, the base bodies 18 and 20 each have a tubular section 26 and 28 which is provided with an internal thread 30 and 32 and in which the end of a spacer provided with a corresponding external thread 34 and 36 38 is screwed in, which serves to hold the two valve heads 12 and 14 at a predetermined distance, in which the closure piece 16 is stretched so that it can be easily inserted into the borehole by means of a feed pipe or hose. The end sections 44 and 46 of the closure piece 16 are drawn onto the outer surfaces 40 or 42 of the tubular sections 26 and 28, which are overlapped by clamping sleeves 48 and 50 formed on the base bodies 18 and 20.

Die beiden Ventilköpfe 12 und 14 sind hinsichtlich der Ventilanordnung in Abhängigkeit von der vorgesehenen Durchströmrichtung unterschiedlich gestaltet. Wenn der Bohrlochverschluß 10 in das zu verschließende Bohrloch eingesetzt ist, muß das in das Bohrloch einzufüllende Schaummaterial durch den Bohrlochverschluß 10 hindurch in das Bohrloch eingepreßt werden. Dazu wird an den der Ausmündung des Bohrlochs benachbarten Einlaßkopf 12 eine Fülleitung 52 angeschlossen. Der Grundkörper 18 ist zu diesem Zweck in seinem vom Verschlußstück 16 abgewandten Endabschnitt mit einem Innengewinde 54 versehen, an dessen innerem Ende eine Schulter 56 ausgebildet ist, die eine Ventilöffnung 59 umgibt. Auf der Schulter 56 ist eine Dichtung 58 angeordnet. In Durchströmrichtung stromab, also in Richtung auf den Auslaßkopf 14, ist auf der anderen Seite der Ventilöffnung 59 ein konischer Ventilsitz 60 ausgebildet, dem eine Ventilkugel 62 zugeordnet ist, welche durch eine Druckfeder 64 gegen den Ventilsitz 60 gedrückt wird. Die Druckfeder 64 stützt sich auf das Ende des in den Grundkörper 18 eingesetzten Distanzstücks 38 ab.The two valve heads 12 and 14 are designed differently with respect to the valve arrangement depending on the flow direction provided. When the borehole closure 10 is inserted into the borehole to be closed, the foam material to be filled into the borehole must be pressed into the borehole through the borehole closure 10. For this purpose, a filling line 52 is connected to the inlet head 12 adjacent to the mouth of the borehole. For this purpose, the base body 18 is provided in its end section facing away from the closure piece 16 with an internal thread 54, on the inner end of which a shoulder 56 is formed which surrounds a valve opening 59. A seal 58 is arranged on the shoulder 56. Downstream in the flow direction, ie in the direction of the outlet head 14, a conical valve seat 60 is formed on the other side of the valve opening 59, to which a valve ball 62 is assigned, which is pressed against the valve seat 60 by a compression spring 64. The compression spring 64 is supported on the end of the spacer 38 inserted into the base body 18.

Am Auslaßkopf 14 ist ebenfalls eine Ventilöffnung 66 vorgesehen, wobei wieder auf der stromab gelegenen Seite dieser Ventilöffnung 66, nun also auf der vom Distanzstück 38 abgewandten Seite, ein Ventilsitz 68 ausgebildet ist, dem eine Ventilkugel 70 zugeordnet ist, die durch eine Druckfeder 72 gegen den Ventilsitz 68 gedrückt wird. Die Druckfeder 72 stützt sich auf einen Nippel 74 ab, der in ein Innengewinde 76 eingeschraubt ist, das an dem vom Verschlußstück 16 abgewandten Endabschnitt des Grundkörpers 20 ausgebildet ist. Durch Verstellen des Nippels 74 kann die Wirkung der Feder 72 eingestellt werden, deren Kraft jedenfalls größer ist als die Kraft der Feder 64 im Einlaßkopf 12, damit in der Anfangsphase der Einleitung des unter Druck stehenden Schaumstoffs zunächst das Verschlußstück 16 gespreizt wird, bevor der Schaumstoff in das Bohrloch austreten kann. Für den Durchtritt des Schaummaterials in das Bohrloch ist der Nippel 74 mit einer Bohrung 78 versehen.A valve opening 66 is also provided on the outlet head 14, again on the downstream one On the side of this valve opening 66, now on the side facing away from the spacer 38, a valve seat 68 is formed, to which a valve ball 70 is assigned, which is pressed against the valve seat 68 by a compression spring 72. The compression spring 72 is supported on a nipple 74 which is screwed into an internal thread 76 which is formed on the end section of the base body 20 which faces away from the closure piece 16. By adjusting the nipple 74, the action of the spring 72 can be adjusted, the force of which is in any case greater than the force of the spring 64 in the inlet head 12, so that in the initial phase of the introduction of the pressurized foam, the closure piece 16 is first spread before the foam can escape into the borehole. The nipple 74 is provided with a bore 78 for the passage of the foam material into the borehole.

Damit das über den Ventilkopf 12 und dessen Ventilöffnung 58 dem Bohrlochverschluß 10 zugeführte Material den Bohrlochverschluß 10 durchströmen und das Verschlußstück 16 spreizen kann, ist das Distanzstück 38 an seinen beiden Enden 80 und 82 jeweils mit einem zentralen, in Längsrichtung des Distanzstücks 38 verlaufenden Kanal 84 bzw. 86 versehen, der sich innerhalb des Distanzstücks 38 jeweils bis zu einer das Distanzstück diametral durchquerenden Durchbrechung 88 bzw. 90 erstreckt. Diese Druchbrechungen 88 und 90 stellen die Verbindung zwischen den Kanälen 80 bzw. 82 und dem Ringraum zwischen dem Verschlußstück 16 und dem Distanzstück 38 dar.So that the material supplied to the borehole closure 10 via the valve head 12 and its valve opening 58 can flow through the borehole closure 10 and the closure piece 16 can spread, the spacer 38 is at its two ends 80 and 82 each with a central channel 84 running in the longitudinal direction of the spacer 38 or 86, which extends within the spacer 38 in each case up to an aperture 88 or 90 which diametrically crosses the spacer. These openings 88 and 90 represent the connection between the channels 80 and 82 and the annular space between the closure piece 16 and the spacer 38.

In dem zwischen den beiden Durchbrechungen 88 und 90 gelegenen Bereich weist das Distanzstück 38 vorzugsweise eine kreuzförmige Querschnittsform auf, wodurch sich unter Beibehaltung der erforderlichen Steifigkeit eine Materialeinsparung ergibt.In the area between the two openings 88 and 90, the spacer 38 preferably has a cross-shaped cross-sectional shape, which results in a material saving while maintaining the required rigidity.

Durch die beschriebene Ausgestaltung des Distanzstücks 38 kann dies in kostengünstiger Weise als Kunststoffspritzteil hergestellt werden. Außerdem werden die in den Bohrlochverschluß eingeleiteten, flüssigen Kunststoffkomponenten beim Durchqueren des Bohrlochverschlusses 10 mehrmals umgelenkt und erfahren dadurch eine intensive, homogene Durchmischung, wodurch die Vorschaltung gesonderter Mischeinrichtungen vor den Bohrlochverschluß entfallen kann.Due to the described design of the spacer 38, this can be produced in a cost-effective manner as a plastic injection-molded part. In addition, the liquid plastic components introduced into the borehole closure are deflected several times as they pass through the borehole closure 10 and are thereby subjected to intensive, homogeneous mixing, as a result of which separate mixing devices upstream of the borehole closure can be omitted.

Der beschriebene Bohrlochverschluß 10 weist eine einfache und kostengünstige Gestaltung auf und kann denkbar einfach gehandhabt werden. Der Bohrlochverschluß muß mit dem Ventilkopf 14 voraus in das Bohrloch eingeschoben werden, worauf dann die Verbindungsleitung zwischen den Pumpen und dem Bohrlochverschluß 10 angeschlossen und nach dem Füllen des Bohrlochs wieder entfernt werden muß.The described borehole closure 10 has a simple and inexpensive design and can be handled very easily. The borehole plug must be inserted into the borehole with the valve head 14 in front of it, whereupon the connecting line between the pumps and the borehole plug 10 must be connected and removed after the borehole has been filled.

Claims (5)

  1. An expanding lost closure plug for boreholes in rock to be filled under pressure with liquid for cementation, comprising an elastic hose-like closure member (16) adapted to automatically force itself against the wall of the borehole owing to the action of the fluid pressure, said closure member extending between an inlet (12) and an outlet (14) head and surrounding a rigid distance member (38) between the inlet (12) and the outlet (14) head, a respective flow duct (22 and 24) extending through the inlet (12) and the outlet (14) head for the sealing liquid and being continued in the distance member (38) as far as a respective opening (88 and 90) into the zone between the closure member (16) and the distance member (38), characterized in that the ducts (22 and 24) of the inlet (12) and outlet (14) head in the distance member (38) are only continued in its end sections (80 and 92) as far as an opening, adjacent to the inlet (12) and, respectively, outlet (14) head between the closure member (16) and the distance member (38).
  2. The closure plug as claimed in claim 1, characterized in that the duct (84 and 86) in the distance member (38) extend from the ends thereof firstly in the longitudinal direction thereof and then merge with an opening section (88 and 90) at an angle to this longitudinal direction.
  3. The closure plug as claimed in claim 2, characterized in that the respective opening section is constituted by a passage (88 and 90) in the distance member (38) arranged transversely in relation to the longitudinal direction thereof.
  4. The closure plug as claimed in claim 3, characterized in that the passages (88 and 90) are in the form of diametrally extending longitudinal slots.
  5. The closure plug as claimed in any one of the preceding claims, characterized in that the distance member (38) has a cruciform cross section in the part between the openings (88 and 90).
EP88107872A 1987-05-19 1988-05-17 Borehole closure plug Expired - Lifetime EP0291925B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88107872T ATE85400T1 (en) 1987-05-19 1988-05-17 BORE HOLE PLUG.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19873716783 DE3716783A1 (en) 1987-05-19 1987-05-19 HOLE HOLE PLUG
DE3716783 1987-05-19

Publications (2)

Publication Number Publication Date
EP0291925A1 EP0291925A1 (en) 1988-11-23
EP0291925B1 true EP0291925B1 (en) 1993-02-03

Family

ID=6327883

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88107872A Expired - Lifetime EP0291925B1 (en) 1987-05-19 1988-05-17 Borehole closure plug

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Country Link
EP (1) EP0291925B1 (en)
AT (1) ATE85400T1 (en)
DE (2) DE3716783A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102071962B (en) * 2010-12-24 2012-10-24 中国矿业大学 Method for sealing downward hole
CN103693620A (en) * 2013-12-18 2014-04-02 常熟振氟新材料有限公司 Device for separating and recovering chlorine gas from chlorine gas and hydrogen chloride mixed gas
CN109209476B (en) * 2018-10-12 2021-07-20 中煤科工集团重庆研究院有限公司 Air guide supercharging device

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1171377B (en) * 1959-11-02 1964-06-04 Dipl Berging Albrecht Graefer Bohrtraenkverfahren and Bohrtraenkgeraet
DE2903137C3 (en) * 1979-01-27 1982-02-18 Bergwerksverband Gmbh, 4300 Essen Tubular lost wellbore closure
DE3014834C2 (en) * 1980-04-17 1985-09-12 Thermoplast & Apparatebau Gmbh, 6270 Idstein Borehole plugs
DE3313852C1 (en) * 1983-04-16 1984-11-15 Diehl GmbH & Co, 8500 Nürnberg Expandable, lost plug for injection boreholes

Also Published As

Publication number Publication date
EP0291925A1 (en) 1988-11-23
ATE85400T1 (en) 1993-02-15
DE3716783C2 (en) 1991-01-03
DE3878029D1 (en) 1993-03-18
DE3716783A1 (en) 1988-12-15

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