EP2476994B1 - Explosion method and assembly of multiple boreholes for filling with explosives - Google Patents
Explosion method and assembly of multiple boreholes for filling with explosives Download PDFInfo
- Publication number
- EP2476994B1 EP2476994B1 EP11150970A EP11150970A EP2476994B1 EP 2476994 B1 EP2476994 B1 EP 2476994B1 EP 11150970 A EP11150970 A EP 11150970A EP 11150970 A EP11150970 A EP 11150970A EP 2476994 B1 EP2476994 B1 EP 2476994B1
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- European Patent Office
- Prior art keywords
- borehole
- rock
- blasting method
- angle
- boreholes
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- 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.)
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42D—BLASTING
- F42D3/00—Particular applications of blasting techniques
- F42D3/04—Particular applications of blasting techniques for rock blasting
Definitions
- the present invention relates to an exploding method for rock layers and the like having the features of independent claim 1 and to an arrangement of a plurality of boreholes for filling with explosives.
- Blasting methods are already known from the prior art, which can be used in particular for blasting rock layers. So is in the WO 2005/033618 A1 an explosive method is known in which in a wellbore different layers of explosives are arranged. The explosive layers are each provided with an igniter. In order to ensure a reliable, homogeneous and intensity-optimized blast, it has often been found in practice that prior drainage of the wellbore may or may even be necessary for such requirements, for example when using black powder or other moisture-sensitive explosives.
- FIG. 1 shows the EP 0 019 683 A2 a drainage device for draining sloping boreholes.
- the dewatering device includes a ball valve and two pipe connections.
- a compressed air line is present, by means of which water can be transported through the pipe connections from the borehole out.
- the pump includes a pump cylinder and a dip tube. To allow fluid to escape from the wellbore through the dip tube, pressure is generated across the pump cylinder. Due to the boreholes, which are often vertically formed in practice, water has to overcome a large difference in height in order to be transported out of the borehole. resulting in a high energy demand for the pumps to carry the water out of the wellbore.
- the primary object of the invention is to provide a method for exploding rock strata, in which liquid, in particular water, can be removed from a borehole in an uncomplicated and energy-efficient manner.
- the blasting process of the present invention is suitable for rock strata.
- the present method can be used for aquiferous rock layers which are at least partially made of granite rock.
- the method provides that in a first step, a first vertical borehole or a plurality of vertical first boreholes are introduced into the rock layer.
- These holes can be made, for example, by means of known from the prior art drilling devices and methods.
- the diameter of the borehole and the depth of the borehole may be subject to a variety of variations within the scope of the present invention.
- the diameter of the first borehole may be at least approximately 100mm. Even larger holes, as needed, for example. Up to 300mm, are conceivable in the context of the present invention.
- the first borehole is now introduced into the rock layer such that it extends at a first predefined angle to a vertical axis. For example, this angle may be between 0 ° and a reasonable acute angle of up to 90 °.
- the second borehole is introduced into the rock layer, liquid / water, which is located in the first borehole, is now discharged via the second borehole in a further method step.
- the second borehole may include an acute angle with a horizontal axis.
- the second borehole may for example have a negative gradient. Additional aids, such as pumping devices, are not necessary in this embodiment of the present invention, since water can now flow independently from the first borehole via the second borehole.
- the method according to the invention also offers the advantage that liquid which flows into the borehole at a later time can be discharged directly again.
- first borehole and the second borehole may be formed such that the first borehole encloses an acute angle with the vertical axis and the second borehole encloses a further acute angle with the horizontal axis.
- first predefined angle between the vertical axis and the first borehole may be at least approximately 0 ° and the second predefined angle between the second borehole and the horizontal axis may be formed as an acute angle.
- first borehole and the second borehole may be at an acute angle with each other.
- the diameter of the first borehole may for example be larger than the diameter of the second borehole.
- variants are also possible in which the diameters of the first and second boreholes are identical or in which the diameter of the first borehole is smaller than the diameter of the second borehole.
- the diameters for the drill holes are expediently based on the respective explosives used; For example, an explosive having a relatively high specific gravity requires a smaller wellbore than, for example, an explosive having a low specific gravity.
- a significant advantage of the method according to the invention is, inter alia, that both boreholes - both the first and the second borehole - are each loaded with explosive and can be used for demolition, which can improve the effectiveness of the blasting and reduce the use of explosives.
- the present invention also relates to an arrangement of a first borehole and a second borehole in a rock layer for a blasting process.
- the first borehole and the second borehole can form a V with respect to their course.
- the second borehole may be disposed opposite the horizontal axis and falling by an angle of less than 90 °.
- a plurality of first boreholes may be inserted in series into the rock layer and each fluidically conductively connected to at least one second borehole.
- a blast can first begin at the outer of the series drilled holes and continue from there to the remaining wells.
- FIG. 1 shows a schematic view of an embodiment of an explosive method according to the invention and an inventive arrangement of a first and a second borehole.
- FIG. 2 shows a schematic view of another embodiment of an explosive method according to the invention and an inventive arrangement of a first and a second borehole.
- FIG. 1 1 shows a schematic view of an embodiment of an explosive method 1 according to the invention and an arrangement 3 according to the invention of a first borehole 9 and a second borehole 11.
- the blasting method 1 is suitable for blasting rock layers 5, in the present case formed by granite 7.
- a first borehole 9 has a profile to the vertical axis V at a first predefined angle, which is 0 °.
- the second borehole 11 communicates fluidically with the first borehole 9.
- the second borehole 11 encloses an acute angle ⁇ with the horizontal axis H.
- the course of the first borehole 9, together with the profile of the second borehole 11, is V-shaped.
- explosive charge (not shown) is arranged inside the first and the second borehole 9 and 11 explosive charge (not shown) is arranged.
- FIG. 2 shows a schematic view of another embodiment of an inventive blasting process 1 and an inventive arrangement 3 of a first well 9 and a second well 11.
- the course of the well 9, together with the course of the channel 11 also in the embodiment of FIG. 2 V-shaped.
- the borehole 9 extends at a first predefined acute angle ⁇ to a vertical axis V.
- the duct 11 extends at a second predefined angle ⁇ to the horizontal axis H, the value of which is at least approximately 0 °.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Drilling And Exploitation, And Mining Machines And Methods (AREA)
- Earth Drilling (AREA)
Description
Die vorliegende Erfindung betrifft ein Sprengverfahren für Gesteinsschichten und dergleichen mit den Merkmalen des unabhängigen Anspruchs 1 sowie eine Anordnung mehrerer Bohrlöcher zur Befüllung mit Sprengmittel.The present invention relates to an exploding method for rock layers and the like having the features of independent claim 1 and to an arrangement of a plurality of boreholes for filling with explosives.
Aus dem Stand der Technik sind bereits Sprengverfahren bekannt, welche insbesondere zum Sprengen von Gesteinsschichten ihre Verwendung finden können. So ist in der
Um ein Bohrloch zu entwässern, werden im Stand der Technik mehrere Möglichkeiten vorgeschlagen. So zeigt bspw. die
In der
Ferner wird in der
Um den Sprengvorgang möglichst effektiv und störungsfrei durchführen zu können, ist es erforderlich, die in den Bohrlöchern zusammenlaufende, eindringende oder bereits befindliche Feuchtigkeit zu reduzieren und nach Möglichkeit weitgehend zu entfernen. Die vorrangige Aufgabe der Erfindung besteht darin, eine Möglichkeit zur Sprengung von Gesteinsschichten zur Verfügung zu stellen, bei welcher Flüssigkeit, insbesondere Wasser, aus einem Bohrloch auf unkomplizierte und energieeffiziente Art und Weise beseitigt werden kann.In order to be able to carry out the blasting process as effectively and without disruption as possible, it is necessary to penetrate the wells that converge in the boreholes or already existing moisture to reduce and, if possible, largely remove. The primary object of the invention is to provide a method for exploding rock strata, in which liquid, in particular water, can be removed from a borehole in an uncomplicated and energy-efficient manner.
Diese Aufgabe der Erfindung wird durch den Gegenstand mit den Merkmalen der unabhängigen Ansprüche gelöst.This object of the invention is achieved by the subject matter having the features of the independent claims.
Das Sprengverfahren der vorliegenden Erfindung ist geeignet für Gesteinsschichten. Insbesondere kann das vorliegende Verfahren für wasserführende Gesteinsschichten, welche zumindest teilweise aus Granitgestein bestehen, verwendet werden. Das Verfahren sieht vor, dass in einem ersten Schritt ein erstes vertikales Bohrloch oder mehrere vertikale erste Bohrlöcher in die Gesteinsschicht eingebracht werden. Diese Bohrungen können beispielsweise mittels aus dem Stand der Technik bekannter Bohrvorrichtungen und -verfahren erfolgen. Der Durchmesser des Bohrlochs und die Tiefe des Bohrlochs können im Rahmen der vorliegenden Erfindung einer Vielzahl von Variationen unterliegen. Beispielsweise kann der Durchmesser des ersten Bohrlochs zumindest annäherungsweise 100mm betragen. Auch größere Bohrlöcher, je nach Bedarf, bspw. auch bis zu 300mm, sind im Rahmen der vorliegenden Erfindung vorstellbar. Das erste Bohrloch wird nun derart in die Gesteinsschicht eingebracht, dass es in einem ersten vordefinierten Winkel zu einer vertikalen Achse verläuft. Dieser Winkel kann beispielsweise zwischen 0º und einem sinnvollen spitzen Winkel von bis zu 90º Grad betragen.The blasting process of the present invention is suitable for rock strata. In particular, the present method can be used for aquiferous rock layers which are at least partially made of granite rock. The method provides that in a first step, a first vertical borehole or a plurality of vertical first boreholes are introduced into the rock layer. These holes can be made, for example, by means of known from the prior art drilling devices and methods. The diameter of the borehole and the depth of the borehole may be subject to a variety of variations within the scope of the present invention. For example, the diameter of the first borehole may be at least approximately 100mm. Even larger holes, as needed, for example. Up to 300mm, are conceivable in the context of the present invention. The first borehole is now introduced into the rock layer such that it extends at a first predefined angle to a vertical axis. For example, this angle may be between 0 ° and a reasonable acute angle of up to 90 °.
Weiterhin erfolgt hierauf das Einbringen mindestens eines mit dem ersten Bohrloch in fluidisch leitender Verbindung stehenden zweiten Bohrlochs bzw. weiterer zweiter Bohrlöcher in die Gesteinsschicht, welche(s) in einem zweiten vordefinierten Winkel zu einer horizontalen Achse verläuft bzw. verlaufen. Nicht zwingend muss lediglich ein weiteres zweites Bohrloch vorhanden sein, denn es können in einigen Ausführungsformen zwei, drei oder mehr zweite Bohrlöcher mit dem ersten Bohrloch fluidisch leitend in Verbindung stehen. Der Verlauf des weiteren Bohrlochs weist gegenüber dem Verlauf des ersten Bohrlochs eine geringere Steigung auf. Beim Abtransport von Flüssigkeit/Wasser durch das zweite Bohrloch anstelle des Abtransportes von Flüssigkeit/Wasser auf direktem Wege durch das erste Bohrloch, muss erfindungsgemäß eine geringere Höhendifferenz überwunden werden, woraus ein reduzierter Energiebedarf zur Beförderung der Flüssigkeit/Wasser resultiert.Furthermore, this is followed by the introduction of at least one second borehole or further second boreholes, which are in fluidically conductive connection with the first borehole, into the rock layer which runs or runs at a second predefined angle to a horizontal axis. Not necessarily, only a further second borehole needs to be present, because in some embodiments, two, three or more second boreholes may fluidly communicate with the first borehole. The course of the further borehole has a lower slope than the course of the first borehole. In the removal of liquid / water through the second borehole instead of the removal of liquid / water directly through the first borehole, a smaller height difference must be overcome according to the invention, resulting in a reduced energy requirement for the transport of the liquid / water results.
Ist das zweite Bohrloch in die Gesteinsschicht eingebracht, so wird in einem weiteren Verfahrensschritt nun Flüssigkeit/Wasser, welche sich im ersten Bohrloch befindet, über das zweite Bohrloch abgeleitet. In einer bevorzugten Ausführungsform kann das zweite Bohrloch mit einer horizontalen Achse einen spitzen Winkel einschließen. Hierbei kann das zweite Bohrloch beispielsweise eine negative Steigung aufweisen. Zusätzliche Hilfsmittel, wie beispielsweise Pumpvorrichtungen, sind bei dieser Ausführungsform der vorliegenden Erfindung nicht nötig, da Wasser nun selbständig vom ersten Bohrloch über das zweite Bohrloch abfließen kann. Auch bietet das erfindungsgemäße Verfahren den Vorteil, dass Flüssigkeit, welche zu einem späteren Zeitpunkt in das Bohrloch fließt, auf direktem Wege wieder abgeleitet werden kann.If the second borehole is introduced into the rock layer, liquid / water, which is located in the first borehole, is now discharged via the second borehole in a further method step. In a preferred embodiment, the second borehole may include an acute angle with a horizontal axis. In this case, the second borehole may for example have a negative gradient. Additional aids, such as pumping devices, are not necessary in this embodiment of the present invention, since water can now flow independently from the first borehole via the second borehole. The method according to the invention also offers the advantage that liquid which flows into the borehole at a later time can be discharged directly again.
Im Hinblick auf den Verlauf des ersten Bohrlochs und des zweiten Bohrlochs können diese derart ausgebildet sein, dass das erste Bohrloch mit der vertikalen Achse einen spitzen Winkel einschließt und das zweite Bohrloch mit der horizontalen Achse einen weiteren spitzen Winkel einschließt. In einer weiteren Ausführungsform kann der erste vordefinierte Winkel zwischen vertikaler Achse und erstem Bohrloch zumindest annäherungsweise 0º betragen und der zweite vordefinierte Winkel zwischen zweitem Bohrloch und horizontaler Achse als spitzer Winkel ausgebildet sein. Ferner können das erste Bohrloch und das zweite Bohrloch miteinander einen spitzen Winkel einschließen. Weiter kann der Durchmesser des ersten Bohrlochs beispielsweise größer als der Durchmesser des zweiten Bohrlochs ausgebildet sein. Ebenso möglich sind jedoch Varianten, bei denen die Durchmesser der ersten und zweiten Bohrlöcher gleich sind oder bei denen der Durchmesser des ersten Bohrlochs kleiner ist als der Durchmesser des zweiten Bohrlochs.With regard to the course of the first borehole and the second borehole, these may be formed such that the first borehole encloses an acute angle with the vertical axis and the second borehole encloses a further acute angle with the horizontal axis. In another embodiment, the first predefined angle between the vertical axis and the first borehole may be at least approximately 0 ° and the second predefined angle between the second borehole and the horizontal axis may be formed as an acute angle. Further, the first borehole and the second borehole may be at an acute angle with each other. Furthermore, the diameter of the first borehole may for example be larger than the diameter of the second borehole. However, variants are also possible in which the diameters of the first and second boreholes are identical or in which the diameter of the first borehole is smaller than the diameter of the second borehole.
Die Durchmesser für die Bohrlöcher richten sich sinnvollerweise nach den jeweils eingesetzten Sprengmitteln; so erfordert ein Sprengstoff mit relativ hohem spezifischem Gewicht ein kleineres Bohrloch als bspw. ein Sprengstoff mit geringem spezifischem Gewicht.The diameters for the drill holes are expediently based on the respective explosives used; For example, an explosive having a relatively high specific gravity requires a smaller wellbore than, for example, an explosive having a low specific gravity.
Ein wesentlicher Vorteil des erfindungsgemäßen Verfahrens besteht u.a. darin, dass beide Bohrlöcher - sowohl das erste als auch das zweite Bohrloch -jeweils mit Sprengmittel beladen werden und zur Sprengung genutzt werden können, wodurch sich die Effektivität der Sprengung verbessern und der Einsatz an Sprengmitteln reduzieren lässt.A significant advantage of the method according to the invention is, inter alia, that both boreholes - both the first and the second borehole - are each loaded with explosive and can be used for demolition, which can improve the effectiveness of the blasting and reduce the use of explosives.
Die vorliegende Erfindung betrifft zudem in einer Ausführungsform eine Anordnung eines ersten Bohrlochs und eines zweiten Bohrlochs in einer Gesteinsschicht für ein Sprengverfahren. Das erste Bohrloch und das zweite Bohrloch können hierbei hinsichtlich ihres Verlaufs ein V ausbilden. Auch kann das zweite Bohrloch entgegen der horizontalen Achse und fallend um einen Winkel von weniger als 90º angeordnet sein.In one embodiment, the present invention also relates to an arrangement of a first borehole and a second borehole in a rock layer for a blasting process. The first borehole and the second borehole can form a V with respect to their course. Also, the second borehole may be disposed opposite the horizontal axis and falling by an angle of less than 90 °.
In einer bevorzugten Ausführungsform der vorliegenden Erfindung können mehrere erste Bohrlöcher in Reihe in die Gesteinsschicht eingebracht sein und jeweils mit mindestens einem zweiten Bohrloch in fluidisch leitende Verbindung gebracht sein. Beispielsweise kann eine Sprengung zunächst an den äußeren der in Reihe angeordneten Bohrlöchern beginnen und sich von dort aus zu den übrigen Bohrlöchern fortsetzen.In a preferred embodiment of the present invention, a plurality of first boreholes may be inserted in series into the rock layer and each fluidically conductively connected to at least one second borehole. For example, a blast can first begin at the outer of the series drilled holes and continue from there to the remaining wells.
Durch das erfindungsgemäße Verfahren ist es möglich, neben allen anderen bekannten und behördlich zugelassenen Gesteinssprengstoffen, hiervon insbesondere ANC- oder AnFO-Sprengstoffe oder andere Sprengstoffe einzusetzen, die handhabungssicher, umweltfreundlich sind und deutlich weniger für missbräuchliche Zwecke verwendet werden können.By the method according to the invention, it is possible, in addition to all other known and officially approved rock explosives, to use in particular ANC or AnFO explosives or other explosives that are safe to handle, environmentally friendly and can be used much less for abusive purposes.
Im Folgenden sollen Ausführungsbeispiele die Erfindung und ihre Vorteile anhand der beigefügten Figuren näher erläutern. Weitere Merkmale, Ziele und Vorteile der vorliegenden Erfindung gehen aus der nun folgenden detaillierten Beschreibung einer bevorzugten Ausführungsform der Erfindung hervor, die als nicht einschränkendes Beispiel dient und auf die beigefügten Zeichnungen Bezug nimmt.In the following, embodiments of the invention and their advantages with reference to the accompanying figures will be explained in more detail. Other features, objects and advantages of the present invention will become more apparent from the following detailed description of a preferred embodiment of the invention given by way of non-limiting example and with reference to the accompanying drawings.
Für gleiche oder gleich wirkende Elemente der Erfindung werden identische Bezugszeichen verwendet. Ferner werden der Übersicht halber nur Bezugszeichen in den einzelnen Figuren dargestellt, die für die Beschreibung der jeweiligen Figur erforderlich sind. Die dargestellten Ausführungsformen stellen lediglich Beispiele da, wie das erfindungsgemäße Sprengverfahren oder das erfindungsgemäße Sprengbild ausgestaltet sein können und stellen keine abschließende Begrenzung dar.For identical or equivalent elements of the invention, identical reference numerals are used. Furthermore, for the sake of clarity, only reference symbols are shown in the individual figures, which are required for the description of the respective figure. The illustrated embodiments are only examples, How the blasting process according to the invention or the blasting image according to the invention can be configured and do not represent a final limitation.
Durch das erfindungsgemäße Verfahren ist es möglich, neben allen anderen bekannten und behördlich zugelassenen Gesteinssprengstoffen, hiervon insbesondere ANC- oder AnFO-Sprengstoffe oder andere Sprengstoffe einzusetzen, die handhabungssicher, umweltfreundlich sind und deutlich weniger für missbräuchliche Zwecke verwendet werden können.By the method according to the invention, it is possible, in addition to all other known and officially approved rock explosives, to use in particular ANC or AnFO explosives or other explosives that are safe to handle, environmentally friendly and can be used much less for abusive purposes.
Die Erfindung wurde unter Bezugnahme auf eine bevorzugte Ausführungsform beschrieben. Es ist jedoch für einen Fachmann vorstellbar, dass Abwandlungen oder Änderungen der Erfindung gemacht werden können, ohne dabei den Schutzbereich der nachstehenden Ansprüche zu verlassen. Insbesondere hinsichtlich der Anordnung des Bohrlochs und des Kanals zueinander, ohne den Schutzbereich der nachstehenden Ansprüche zu verlassen.The invention has been described with reference to a preferred embodiment. However, it will be apparent to those skilled in the art that modifications or changes may be made to the invention without departing from the scope of the following claims. In particular, with regard to the arrangement of the borehole and the channel to each other, without departing from the scope of the following claims.
- 11
- SprengverfahrenbLASTING
- 33
- Anordnungarrangement
- 55
- Gesteinsschichtrock formation
- 77
- Granitgranite
- 99
- Bohrlochwell
- 1111
- Kanalchannel
- αα
- Erster vordefinierter WinkelFirst predefined angle
- ββ
- Zweiter vordefinierter WinkelSecond predefined angle
- VV
- Vertikale AchseVertical axis
- HH
- Horizontale AchseHorizontal axis
Claims (9)
- A rock blasting method (1) for layers of rock (5) and the like materials, comprising the following process steps:- Introducing a first borehole (9) into the layer of rock (5), with said borehole running at a predefined angle (α) to a vertical axis (V), and- introducing a second borehole (11) into the layer of rock (5), with said second borehole (11) being in a fluidically conductive connection with the first borehole (9), and with said second borehole (11) running at a second predefined angle (β) to a horizontal axis (H), wherein the second borehole (11) is slightly inclined in relation to the first borehole (9) in order to reduce the height difference that has to be overcome when liquid is discharged through the second borehole (11) rather than being discharged through the first borehole (9),- discharging any liquid present in the first borehole (9) through the second borehole (11), and- inserting an explosive charge with fuse into the first borehole (9) or into the first (9) and second borehole (11), and- igniting the explosive charge.
- The rock blasting method (1) according to claim 1, wherein the first borehole (9) encloses an acute angle (α) with the vertical axis (V), and wherein the second borehole (11) encloses an acute angle with the horizontal axis (H).
- The rock blasting method (1) according to claim 1, wherein the first predefined angle (α) at least approximates 0 degrees, and wherein the second predefined angle (β) forms an acute angle.
- The rock blasting method (1) according to one of the claims 1 to 3, wherein the first borehole (9) and the second borehole (11) enclose an acute angle.
- The rock blasting method (1) according to one of the claims 1 to 4, wherein the first borehole (9) has a diameter larger than the second borehole (11).
- An application of the rock blasting method (1) according to one of the claims 1 to 5 for layers of rock (5) which, at least in part, consist of granite.
- A disposition of a first borehole (9) and a second borehole (11) in a layer of rock (5) for a rock blasting method (1) according to one of the claims 1 to 6, wherein the first borehole (9) and the second borehole (11) run in relation to each other in such a manner as to form a V.
- The disposition according to claim 7, wherein the second borehole (11) is slanted in relation to the horizontal axis (H) and downward by an angle () of less than 90 degrees.
- The disposition according to claim 7 or 8, wherein a multitude of first boreholes are introduced into the layer of rock (5) in a row, and wherein the multitude of first boreholes (9) are each brought into a fluidically conductive connection with at least one second borehole (11).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP11150970A EP2476994B1 (en) | 2011-01-14 | 2011-01-14 | Explosion method and assembly of multiple boreholes for filling with explosives |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP11150970A EP2476994B1 (en) | 2011-01-14 | 2011-01-14 | Explosion method and assembly of multiple boreholes for filling with explosives |
Publications (2)
Publication Number | Publication Date |
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EP2476994A1 EP2476994A1 (en) | 2012-07-18 |
EP2476994B1 true EP2476994B1 (en) | 2013-03-27 |
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ID=44080287
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Application Number | Title | Priority Date | Filing Date |
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EP11150970A Not-in-force EP2476994B1 (en) | 2011-01-14 | 2011-01-14 | Explosion method and assembly of multiple boreholes for filling with explosives |
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Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE186266C (en) | ||||
DE1862661U (en) * | 1962-05-22 | 1962-11-22 | Heinrich Niemann | DRILL HOLE DEWATERING DEVICE OPERATED WITH COMPRESSED AIR. |
DE2922649C2 (en) | 1979-06-02 | 1982-10-14 | Bergwerksverband Gmbh, 4300 Essen | Device for the drainage of sloping boreholes for gas suction |
CA2242871C (en) * | 1997-01-10 | 2002-04-09 | Boyd J. Wathen | Method of breaking slabs and blocks of rock from rock formations and explosive shock transmitting and moderating composition for use therein |
KR20020082501A (en) * | 2001-03-20 | 2002-10-31 | 티앤알비 주식회사 | Bench rock blasting method for controlling drill hole space, loading amount and blasting sequence |
ZA200407780B (en) | 2003-10-03 | 2005-09-28 | Int Tech Llc | Blasting |
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2011
- 2011-01-14 EP EP11150970A patent/EP2476994B1/en not_active Not-in-force
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