EP0291925A1 - Borehole closure plug - Google Patents

Borehole closure plug Download PDF

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Publication number
EP0291925A1
EP0291925A1 EP88107872A EP88107872A EP0291925A1 EP 0291925 A1 EP0291925 A1 EP 0291925A1 EP 88107872 A EP88107872 A EP 88107872A EP 88107872 A EP88107872 A EP 88107872A EP 0291925 A1 EP0291925 A1 EP 0291925A1
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EP
European Patent Office
Prior art keywords
spacer
inlet
borehole
outlet head
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
EP88107872A
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German (de)
French (fr)
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EP0291925B1 (en
Inventor
Klaus Gerstenberg
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Thermoplast & Apparatebau GmbH
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Thermoplast & Apparatebau GmbH
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Application filed by Thermoplast & Apparatebau GmbH filed Critical Thermoplast & Apparatebau GmbH
Priority to AT88107872T priority Critical patent/ATE85400T1/en
Publication of EP0291925A1 publication Critical patent/EP0291925A1/en
Application granted granted Critical
Publication of EP0291925B1 publication Critical patent/EP0291925B1/en
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    • 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
    • E21B33/12—Packers; Plugs
    • E21B33/127—Packers; 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.
  • a borehole closure of this type is known from DE-PS 30 14 834.
  • the spacer is tubular and thus represents a direct connection between the flow channels in the inlet and outlet heads.
  • the wall of the spacer is provided with openings.
  • non-return valves biased and blocking against the filling direction are provided, the preload of the valve at the outlet head being greater than the preload of the valve at the inlet head, so that when the pressurized liquid flows into the spacer, the liquid about the through breaks in the spacer also penetrates into the space between the spacer and the closure piece and a total pressure builds up inside the closure plug before opening the valve on the outlet head, which spreads the closure piece and presses 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 manufactured 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. Since a process-specific reaction, for example of the components of polyurethane, assuming intensive 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 at no additional cost, so that separate mixing devices to be arranged between the pumps and the sealing plug can be omitted, and the spacer as simple plastic molded part in a design that meets all requirements should be retained.
  • This configuration of the sealing plug causes the liquid which is pressed through the sealing plug and comprises the plastic components to undergo multiple deflection. Even the double deflection following the inlet head corresponds to the function of a conventional swirler. The renewed double deflection 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 Ver end piece 16 is stretched so that it can be easily inserted into the borehole by means of a feed pipe or a 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 58, 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 facing 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 48 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 is preferred have 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)
  • Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
  • Pressure Vessels And Lids Thereof (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 erstrek­kenden Verschlußstück, das ein starres Distanzstück zwischen Einlaß- und Auslaßkopf umgibt, wobei sich durch den Einlaß- und Auslaßkopf jeweils ein Strö­mungskanal für die Flüssigkeit erstreckt.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.

Ein Bohrlochverschluß dieser Art ist aus der DE-PS 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. Die Wandung des Distanzstücks ist mit Durchbrechungen versehen. Im Bereich des Einlaß- und des Auslaßkopfs sind jeweils entgegen der Füllrichtung vorgespannte und sperrende Rückschlagventile vorgesehen, wobei die Vorspannung des 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 Durch­ brechungen im Distanzstück auch in den Raum zwischen Distanzstück und Verschlußstück eindringt und sich insgesamt im Inneren des Verschlußstopfens vor dem Öffnen des Ventils 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-PS 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. The wall of the spacer is provided with openings. In the area of the inlet and outlet heads, non-return valves biased and blocking against the filling direction are provided, the preload of the valve at the outlet head being greater than the preload of the valve at the inlet head, so that when the pressurized liquid flows into the spacer, the liquid about the through breaks in the spacer also penetrates into the space between the spacer and the closure piece and a total pressure builds up inside the closure plug before opening the valve on the outlet head, which spreads the closure piece and presses 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 manufactured 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 in­ tensive 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. Since a process-specific reaction, for example of the components of polyurethane, assuming intensive 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 at no additional cost, so that separate mixing devices to be arranged between the pumps and the sealing plug can be omitted, and the spacer as simple plastic 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 in den Endabschnitten des Distanzstücks 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 end sections of the spacer each continue up to a mouth adjacent to the inlet and outlet heads in the area between the closure piece and the spacer.

Durch diese Ausgestaltung des Verschlußstopfens er­fährt die durch den Verschlußstopfen 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 Um­lenkung 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.This configuration of the sealing plug causes the liquid which is pressed through the sealing plug and comprises the plastic components to undergo multiple deflection. Even the double deflection following the inlet head corresponds to the function of a conventional swirler. The renewed double deflection 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:
  • 1 shows a longitudinal section through a plug according to the invention before insertion into the borehole,
  • 2 is a side view of this in the clamping position,
  • 3 shows a longitudinal section through the spacer,
  • Fig. 4 is a section along the line IV-IV in Fig. 3 and
  • 5 shows 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 Ver­ schlußstück 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 Ver end piece 16 is stretched so that it can be easily inserted into the borehole by means of a feed pipe or a 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 58 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. In the flow direction downstream, that is, in the direction of the outlet head 14, a conical valve seat 60 is formed on the other side of the valve opening 58, 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 facing 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 48 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 48 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 vorzugs­ weise 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 is preferred have 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 thereby experience 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. Aufweitbarer, verlorener Verschlußstopfen (10) 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- (12) und einem Auslaßkopf (14) erstreckenden Verschlußstück (16), das ein starres Distanzstück (38) zwischen Einlaß- (12) und Auslaßkopf (14) um­gibt, wobei sich durch den Einlaß- und den Auslaßkopf jeweils ein Strömungskanal (22, 24) für die Flüssig­keit erstreckt, dadurch gekennzeichnet, daß sich die Strömungskanäle (22, 24) des Einlaß- (12) und des Auslaßkopfes (14) in den Endabschnitten (80, 82) des Distanzstücks (38) jeweils bis zu einer dem Einlaß­bzw. Auslaßkopf benachbarten Ausmündung (88, 90) in den Bereich zwischen dem Verschlußstück (16) und dem Distanzstück (38) fortsetzen.1. Expandable, lost plug (10) 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 tightening against the wall of the borehole, between an inlet (12) and an outlet head ( 14) extending closure piece (16) which surrounds a rigid spacer (38) between inlet (12) and outlet head (14), a flow channel (22, 24) for the liquid extending through the inlet and outlet heads, characterized in that the flow channels (22, 24) of the inlet (12) and the outlet head (14) in the end sections (80, 82) of the spacer (38) each up to one of the inlet or. Continue outlet head adjacent mouth (88, 90) in the area between the closure piece (16) and the spacer (38). 2. Verschlußstopfen nach Anspruch 1, dadurch ge­kennzeichnet, daß sich die Kanäle (84, 86) im Di­stanzstück (38) von dessen Enden her zunächst in des­sen Längsrichtung erstrecken und dann in einen gegen­über dieser Längsrichtung abgewinkelten Mündungsab­schnitt (88, 90) übergehen.2. Sealing plug according to claim 1, characterized in that the channels (84, 86) in the spacer (38) from the ends thereof first extend in the longitudinal direction and then merge into an angled section of this mouth (88, 90). 3. Verschlußstopfen nach Anspruch 2, dadurch ge­kennzeichnet, daß der Mündungsabschnitt jeweils durch eine im Distanzstück (38) quer zu dessen Längsrich­tung angeordnete Durchbrechung (88, 90) gebildet wird.3. Sealing plug according to claim 2, characterized in that the mouth section is formed in each case by an opening (88, 90) arranged transversely to its longitudinal direction in the spacer (38). 4. Verschlußstopfen nach Anspruch 3, dadurch ge­kennzeichnet, , daß die Durchbrechungen (88, 90) als diametral verlaufende Längsschlitze ausgebildet sind.4. Plug according to claim 3, characterized in that the openings (88, 90) are designed as diametrically extending longitudinal slots. 5. Verschlußstopfen nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß das Distanz­stück (38) im Bereich zwischen den Ausmündungen (88, 90) einen kreuzförmigen Querschnitt aufweist.5. Plug according to one of the preceding claims, characterized in that the spacer (38) has a cross-shaped cross section in the region between the openings (88, 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
DE3716783 1987-05-19
DE19873716783 DE3716783A1 (en) 1987-05-19 1987-05-19 HOLE HOLE PLUG

Publications (2)

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

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EP88107872A Expired - Lifetime EP0291925B1 (en) 1987-05-19 1988-05-17 Borehole closure plug

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

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
CN109209476A (en) * 2018-10-12 2019-01-15 中煤科工集团重庆研究院有限公司 Air guide supercharging device

Families Citing this family (1)

* 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

Citations (3)

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Publication number Priority date Publication date Assignee Title
DE1171377B (en) * 1959-11-02 1964-06-04 Dipl Berging Albrecht Graefer Bohrtraenkverfahren and Bohrtraenkgeraet
DE3313852C1 (en) * 1983-04-16 1984-11-15 Diehl GmbH & Co, 8500 Nürnberg Expandable, lost plug for injection boreholes
DE3014834C2 (en) * 1980-04-17 1985-09-12 Thermoplast & Apparatebau Gmbh, 6270 Idstein Borehole plugs

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2903137C3 (en) * 1979-01-27 1982-02-18 Bergwerksverband Gmbh, 4300 Essen Tubular lost wellbore closure

Patent Citations (3)

* 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
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

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
CN109209476A (en) * 2018-10-12 2019-01-15 中煤科工集团重庆研究院有限公司 Air guide supercharging device

Also Published As

Publication number Publication date
DE3716783A1 (en) 1988-12-15
DE3878029D1 (en) 1993-03-18
ATE85400T1 (en) 1993-02-15
DE3716783C2 (en) 1991-01-03
EP0291925B1 (en) 1993-02-03

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