WO2007004857A1 - Synthetic bore - Google Patents

Synthetic bore Download PDF

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Publication number
WO2007004857A1
WO2007004857A1 PCT/MX2006/000064 MX2006000064W WO2007004857A1 WO 2007004857 A1 WO2007004857 A1 WO 2007004857A1 MX 2006000064 W MX2006000064 W MX 2006000064W WO 2007004857 A1 WO2007004857 A1 WO 2007004857A1
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WO
WIPO (PCT)
Prior art keywords
synthetic
hole
explosive
holes
ground
Prior art date
Application number
PCT/MX2006/000064
Other languages
Spanish (es)
French (fr)
Inventor
Pedro Augusto Novo Mercado
Original Assignee
Pedro Augusto Novo Mercado
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Pedro Augusto Novo Mercado filed Critical Pedro Augusto Novo Mercado
Publication of WO2007004857A1 publication Critical patent/WO2007004857A1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42D—BLASTING
    • F42D1/00—Blasting methods or apparatus, e.g. loading or tamping
    • F42D1/08—Tamping methods; Methods for loading boreholes with explosives; Apparatus therefor
    • F42D1/18—Plugs for boreholes

Definitions

  • This utility model refers to improvements in the holes used, both in the Underground Mining Industry, and in the Construction Industry, for the extraction of minerals and earthworks and more specifically to the interior coating and / or extension of the perforations (holes) in which the explosive will be charged for "blasting” or “ thundering " on the ground, using a thin-walled, cylindrical, straight, semi-rigid, antistatic plastic tube, characterized by a tube elongated cylindrical, open at one end by which the explosive is loaded and with a water-tight seal on the other and that once inserted into the hole, allows easy loading of the explosive in bulk, maintaining its shape and qualities despite of water, blows, cracks and looseness of the ground, and vibrations caused during the drilling process.
  • explosives are planted or loaded in holes made in the ground (holes) using drilling machines, which have drill bits of water-cooled drilling, which causes the floor holes that are the first to be made to flood and become clogged with the material of the top holes, which forces cleaning and drainage processes and the use of high explosive sausages that is usually more expensive than the bulk explosive used in dry, free and continuous holes, on other occasions the ground has moisture or running water on the fronts and this affects negatively the performance of the explosive in bulk. It is also common loose terrain that when drilling is caused to drop material from the ground and obstruct the holes already made, causing reprocesses, waste of time and higher costs.
  • Figure 1 shows a side view of the finished Synthetic Borehole (1) with its three types of sealed (9) and water-tight tips, also the mouth (10) by which the bulk explosive is loaded.
  • Figure 2 shows a cross-sectional view of the finished Synthetic Hole
  • Figure 3 shows a side view of the Synthetic Hole (1) installed in a field
  • Figure 4 shows a side view of a Synthetic Hole (1) installed in a floor hole (3) of the land (2), with water and material accumulation (5) of the upper holes (3).
  • Figure 5 shows a side view of a Synthetic Hole (1) installed in a hole
  • Figure 6 shows a side view of a peripheral hole (3) of a damped roof or blasting wall with Synthetic Bore (1) disengaged that creates an air chamber (8), fixed on the front (4) with a wedge (7) ).
  • the Synthetic Borehole (1) is characterized by a straight plastic tube to continue drilling even if there are faults (6) on the ground (2) and semi-rigid, so that it has mechanical resistance and allow it to be confined under pressure to the bottom, as it is adjusted to the wall of the hole (3) and with sufficient flexibility to withstand the impact and the blows of stones without suffering any damage, especially the synthetic floor holes that are the first that are installed, absorb imperfections or deviations in the formation of the hole (3) and facilitate its placement, in addition to the synthetic floor holes (1) that are made longer than the hole to be able to bend the excess with the mouth (10) upwards and avoid between the water and material (5) that accumulates by the upper drilling and / or by the water that leaves the ground (2); the synthetic holes of the front (all but those of floor) are minimum of the length of the hole (3) plus a few centimeters that leave the front (4) to make a full, cylindrical load because it is the shape of the hole (3) and also gives stability when confined immediately after removing the drill bit, as this prevent
  • said sealed end or tip when it is loaded, said sealed end or tip may have the following forms: flat, angular and oval, the variation in the shape of the sealed end or tip. (9), is due again to facilitate the introduction of Synthetic Borehole (1) and its application will depend on the conditions of the terrain (2) in question. For example, if the ground (2) is firm, continuous and unobstructed, the flat-tipped (10) can be used and when the ground (2) is loose and with faults (6) or cracks, the sharp-tipped ( 9) or oval to facilitate its confinement.
  • Synthetic Hole (1) Once the Synthetic Hole (1) has been inserted into the natural hole (3), it allows an easy loading of bulk explosive which is cheap and easy to use, so that the operation becomes faster and cheaper; it remains dry and free maintaining its shape and position despite the shocks and vibrations caused during the drilling process; decoupled or smaller in diameter than the borehole (3), creating an air chamber (8) to perform a damped blasting for holes (3) of wall or ceiling in loose terrain and damage these as little as possible.
  • Figure 3 shows a Synthetic Hole (1) installed, in a hole (3), drilled in a field (2) that can have moisture or water runoff and ready to be loaded with bulk explosive material.
  • Figure 4 shows a Synthetic Hole (1) installed, in a floor hole (3), and ready to be loaded with explosive material in bulk, without being affected by the accumulated water or the materials dropped from the holes (3 ) superior.
  • Figure 5 shows a Synthetic Hole (1) installed, in a hole (3), drilled in a ground (2) with faults (6) and ready to be loaded with bulk explosive material.
  • Figure 6 shows a Synthetic Hole (1) installed uncoupled, creating an air chamber (8), in a peripheral ceiling or wall hole (3), made in a

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  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Geophysics And Detection Of Objects (AREA)

Abstract

The invention relates to a synthetic bore which is intended for the construction and underground mining industries. The invention consists of a semi-rigid plastic tube which facilitates filling with bulk explosive, while staying dry and retaining the form and structure thereof despite impacts and vibrations produced during boring or undesired terrain features.

Description

BARRENO SINTÉTICO SYNTHETIC BARRENE
EXTRACTO DEL MODELO DE UTILIDADEXTRACT OF THE UTILITY MODEL
El presente modelo de utilidad, se refiere a mejoras en los barrenos utilizados, tanto en la Industria de la Minería Subterránea , como en la Industria de la Construcción, para la extracción de minerales y movimientos de tierra y más específicamente al recubrimiento interior y/o extensión de las perforaciones realizadas (barrenos) en las que se cargará el explosivo para las "voladuras" o "tronadas" en el terreno, utilizando un tubo plástico de pared delgada, cilindrico, recto, semi-rígido, antiestático, caracterizado por un tubo cilindrico alargado, abierto en uno de sus extremos por el que se carga el explosivo y con sello hermético al agua por el otro y que una vez inserto en el barreno, permite un fácil cargado del explosivo a granel, manteniendo su forma y cualidades a pesar del agua, los golpes, las grietas y lo flojo del terreno, y las vibraciones provocadas durante el proceso de perforación.This utility model refers to improvements in the holes used, both in the Underground Mining Industry, and in the Construction Industry, for the extraction of minerals and earthworks and more specifically to the interior coating and / or extension of the perforations (holes) in which the explosive will be charged for "blasting" or " thundering " on the ground, using a thin-walled, cylindrical, straight, semi-rigid, antistatic plastic tube, characterized by a tube elongated cylindrical, open at one end by which the explosive is loaded and with a water-tight seal on the other and that once inserted into the hole, allows easy loading of the explosive in bulk, maintaining its shape and qualities despite of water, blows, cracks and looseness of the ground, and vibrations caused during the drilling process.
ANTECEDENTES DE LA INVENCIÓN (REFERENCIAS)BACKGROUND OF THE INVENTION (REFERENCES)
En la Industria Minera Subterránea y de la Construcción actualmente y con el objeto de realizar la extracción de minerales o bien realizar movimientos de tierras, se utilizan explosivos plantados o cargados en perforaciones hechas en el terreno (barrenos) utilizando máquinas barrenadoras, las cuales poseen brocas de perforación enfriadas con agua, lo que ocasiona que los barrenos del piso que son los primeros que se hacen, se inunden y se obstruyan con el material de los barrenos superiores esto obliga a procesos de limpieza y desagüe y al uso de salchichas de alto explosivo que normalmente es mas caro que el explosivo a granel que se utiliza en barrenos secos, libres y continuos, en otras ocasiones el terreno tiene humedad o agua corriente en los frentes y esto afecta negativamente el desempeño del explosivo a granel. También es común terrenos flojos que al barrenar se provoque que caiga material del terreno y obstruyan los barrenos ya hechos, ocasionando reprocesos, pérdida de tiempo y mayores costos. En algunos terrenos se presentan fallas o grietas que rompen la continuidad del barreno y provocan que al cargar se pierda mucho explosivo en esas grietas o que definitivamente no se puedan cargar, pues las salchichas al no ser rectas y rígidas tampoco lo permiten. Todas las situaciones anteriores se resuelven de manera efectiva al utilizar el Barreno Sintético, que es de fácil instalación y cargado rápido, pues conserva su forma original y se mantiene seco y libre de obstrucción por sus características, además no genera riesgos de acumular carga estática por la fricción al confinarse en terrenos secos, pues es antiestático. En terrenos flojos los barrenos periféricos de la barrenaciόn dañan o dejan inestables los techos y paredes del túnel o socavón obligando a inversiones adicionales para disminuir los riesgos de desprendimientos, este -problema se disminuye notablemente con lo que se llama voladura amortiguada con Barreno Sintético desacoplado, que consiste en meter al barreno un Barreno Sintético de menor diámetro y fijarlo, de tal manera que queda una cámara de aire que ocasiona una voladura amortiguada y deja menos dañados e inestable los techos y paredes. BREVE DESCRIPCIÓN DE LAS FIGURASIn the Underground Mining and Construction Industry currently and in order to carry out the extraction of minerals or perform earthworks, explosives are planted or loaded in holes made in the ground (holes) using drilling machines, which have drill bits of water-cooled drilling, which causes the floor holes that are the first to be made to flood and become clogged with the material of the top holes, which forces cleaning and drainage processes and the use of high explosive sausages that is usually more expensive than the bulk explosive used in dry, free and continuous holes, on other occasions the ground has moisture or running water on the fronts and this affects negatively the performance of the explosive in bulk. It is also common loose terrain that when drilling is caused to drop material from the ground and obstruct the holes already made, causing reprocesses, waste of time and higher costs. In some areas there are failures or cracks that break the continuity of the hole and cause that when loading is lost a lot of explosive in those cracks or that they definitely cannot be loaded, because the sausages being not straight and rigid do not allow it either. All the above situations are effectively resolved by using the Synthetic Hole, which is easy to install and quickly loaded, as it retains its original shape and remains dry and free of obstruction due to its characteristics, and also does not generate risks of accumulating static charge by friction when confined in dry land, it is antistatic. In loose terrain, the peripheral boreholes of the borehole damage or leave the ceilings and walls of the tunnel or tunnel unstable, forcing additional investments to reduce the risks of landslides, this problem is markedly diminished with what is called damped blasting with uncoupled Synthetic Borehole, which consists of putting a synthetic bore of smaller diameter into the borehole and fixing it, so that there is an air chamber that causes a damped blasting and leaves ceilings and walls less damaged and unstable. BRIEF DESCRIPTION OF THE FIGURES
La figura 1 muestra una vista lateral del Barreno Sintético terminado (1) con sus tres tipos de puntas selladas (9) y herméticas al agua, también la boca (10) por la que se carga el explosivo a granel.Figure 1 shows a side view of the finished Synthetic Borehole (1) with its three types of sealed (9) and water-tight tips, also the mouth (10) by which the bulk explosive is loaded.
La figura 2 muestra una vista de la sección transversal del Barreno Sintético terminadoFigure 2 shows a cross-sectional view of the finished Synthetic Hole
(1) con sus tres tipos de puntas selladas (9) y herméticas al agua.(1) with its three types of sealed tips (9) and water tight.
La figura 3 muestra una vista lateral del Barreno Sintético (1) instalado en un terrenoFigure 3 shows a side view of the Synthetic Hole (1) installed in a field
(2) húmedo o con presencia de agua. Barreno Sintético (1), Terreno (2), Barreno (3), Frente (4)(2) wet or with presence of water. Synthetic Borehole (1), Ground (2), Borehole (3), Front (4)
La figura 4 muestra una vista lateral de un Barreno Sintético (1) instalado en un barreno de piso (3) del terreno (2), con acumulación de agua y material(5) de los barrenos (3) superiores.Figure 4 shows a side view of a Synthetic Hole (1) installed in a floor hole (3) of the land (2), with water and material accumulation (5) of the upper holes (3).
Barreno Sintético (1), Terreno (2), Barreno de piso (3), Frente (4), Acumulación de agua y material (5),Synthetic hole (1), Land (2), Floor hole (3), Front (4), Water and material accumulation (5),
La figura 5 muestra una vista lateral de un Barreno Sintético (1) instalado en un barrenoFigure 5 shows a side view of a Synthetic Hole (1) installed in a hole
(3), cuyo terreno (2) tiene fallas (6)(3), whose terrain (2) has faults (6)
Barreno Sintético (1), Terreno (2), Barreno (3), Fallas (6).Synthetic Borehole (1), Ground (2), Borehole (3), Failures (6).
La figura 6 muestra una vista lateral de un barreno (3) periférico de techo o pared de voladura amortiguada con Barreno Sintético (1) desacoplado que crea una cámara de aire (8), fijado en el frente (4) con una cuña (7).Figure 6 shows a side view of a peripheral hole (3) of a damped roof or blasting wall with Synthetic Bore (1) disengaged that creates an air chamber (8), fixed on the front (4) with a wedge (7) ).
Barreno Sintético (1), Terreno (2), Barreno (3), Frente (4), Cuña (7), Cámara de aire (8). DESCRIPCIÓN DEL MODELO DE UTILIDADSynthetic Borehole (1), Ground (2), Borehole (3), Front (4), Wedge (7), Air Chamber (8). UTILITY MODEL DESCRIPTION
Con referencia a dichas figuras, El Barreno Sintético (1) está caracterizado por un tubo de plástico recto para dar continuidad a la perforación aunque se presenten fallas(6) en el terreno (2) y semi-rígido, con la finalidad de que tenga resistencia mecánica y permita confinarlo a presión hasta el fondo, pues va ajustado a la pared del barreno (3) y con la flexibilidad suficiente para soportar el impacto y los golpes de piedras sin sufrir daño alguno sobretodo los barrenos sintéticos de piso que son los primeros que se instalan, absorber las imperfecciones o desviaciones en la formación del barreno (3) y facilitar la colocación del mismo, además para que los barrenos sintéticos (1) de piso que se hacen mas largos que el barreno para poder curvear el sobrante con la boca (10) hacia arriba y evitar entre el agua y material (5) que se acumula por la barrenación superior y/o por el agua que sale del terreno (2); los barrenos sintéticos del frente (todos menos los de piso) son mínimo del largo del barreno (3) más unos centímetros que salen del frente (4) para hacer un cargado completo, cilindrico porque es la forma del barreno (3) y además da estabilidad al confinarlo inmediatamente después de sacar la broca, pues así se evita en terrenos flojos la caída de material y obstrucciones del barreno (3) provocada por la vibración generada cuando se están haciendo los otros barrenos (3), antiestático, a fin de evitar la acumulación de carga eléctrica estática generada por fricción al confinarlo hasta el fondo del barreno (3) y evitar riesgos de explosión durante el cargado del explosivo, de pared delgada y diámetro exterior ajustado al barreno (3) natural, con dos propósitos, permite cargar la cantidad requerida de explosivo y evita la formación de una cámara de aire (8) que puede amortiguar la voladura haciéndola ineficiente, abierto en uno de sus extremos (10) y por el otro con la punta sellada (9) hermética al agua, porque no solo por el agua que se acumula en los barrenos (3) de piso, sino porque en muchas ocasiones hay agua en el terreno y hay que evitar moje al explosivo a granelWith reference to these figures, the Synthetic Borehole (1) is characterized by a straight plastic tube to continue drilling even if there are faults (6) on the ground (2) and semi-rigid, so that it has mechanical resistance and allow it to be confined under pressure to the bottom, as it is adjusted to the wall of the hole (3) and with sufficient flexibility to withstand the impact and the blows of stones without suffering any damage, especially the synthetic floor holes that are the first that are installed, absorb imperfections or deviations in the formation of the hole (3) and facilitate its placement, in addition to the synthetic floor holes (1) that are made longer than the hole to be able to bend the excess with the mouth (10) upwards and avoid between the water and material (5) that accumulates by the upper drilling and / or by the water that leaves the ground (2); the synthetic holes of the front (all but those of floor) are minimum of the length of the hole (3) plus a few centimeters that leave the front (4) to make a full, cylindrical load because it is the shape of the hole (3) and also gives stability when confined immediately after removing the drill bit, as this prevents loose material and obstructions in the hole (3) caused by the vibration generated when the other holes (3) are being made, antistatic, in order to avoid the accumulation of static electric charge generated by friction when confined to the bottom of the hole (3) and avoid explosion risks during the loading of the explosive, thin wall and outer diameter adjusted to the natural hole (3), with two purposes, allows charging the required amount of explosive and prevents the formation of an air chamber (8) that can dampen the blast making it inefficient, open at one of its ends (10) and on the other with the sealed tip (9) waterproof, because not only because of the water that accumulates in the floor holes (3), but because in many times there is water on the ground and you have to avoid wetting the explosive in bulk
cuando este se cargue, dicho extremo sellado o punta, puede tener las siguientes formas: plana, angular y ovalada, la variación en la forma del extremo sellado o punta. (9), obedece nuevamente a facilitar la introducción del Barreno Sintético (1) y su aplicación dependerá de las condiciones del terreno (2) en cuestión. Por ejemplo, si el terreno (2) es firme, continuo y sin obstrucciones puede usarse el de punta plana (10) y cuando es terreno (2) flojo y con fallas (6) o grietas, se puede usar el de punta aguda (9) u ovalada para facilitar su confinamiento. Una vez que el Barreno Sintético (1) ha quedado inserto en el barreno (3) natural, permite un fácil cargado de explosivo a granel el cual es barato y fácil de usar, por lo que la operación se vuelve más rápida y económica; pues permanece seco y libre manteniendo su forma y posición a pesar de los golpes y vibraciones provocados durante el proceso de perforación; desacoplado o de menor diámetro que el barreno (3), creando una cámara de aire (8) para realizar una voladura amortiguada para barrenos (3) de pared o techo en terrenos flojos y dañar estos lo menos posible.when it is loaded, said sealed end or tip may have the following forms: flat, angular and oval, the variation in the shape of the sealed end or tip. (9), is due again to facilitate the introduction of Synthetic Borehole (1) and its application will depend on the conditions of the terrain (2) in question. For example, if the ground (2) is firm, continuous and unobstructed, the flat-tipped (10) can be used and when the ground (2) is loose and with faults (6) or cracks, the sharp-tipped ( 9) or oval to facilitate its confinement. Once the Synthetic Hole (1) has been inserted into the natural hole (3), it allows an easy loading of bulk explosive which is cheap and easy to use, so that the operation becomes faster and cheaper; it remains dry and free maintaining its shape and position despite the shocks and vibrations caused during the drilling process; decoupled or smaller in diameter than the borehole (3), creating an air chamber (8) to perform a damped blasting for holes (3) of wall or ceiling in loose terrain and damage these as little as possible.
En la figura 3 se muestra un Barreno Sintético (1) instalado, en un barreno (3), perforado en un terreno (2) que puede tener humedad o escurrimientos de agua y listo para ser cargado con material explosivo a granel. En la figura 4 se muestra un Barreno Sintético (1) instalado, en un barreno (3) de piso, y listo para ser cargado con material explosivo a granel, sin que le afecte el agua acumulada o los materiales caídos de los barrenos (3) superiores.Figure 3 shows a Synthetic Hole (1) installed, in a hole (3), drilled in a field (2) that can have moisture or water runoff and ready to be loaded with bulk explosive material. Figure 4 shows a Synthetic Hole (1) installed, in a floor hole (3), and ready to be loaded with explosive material in bulk, without being affected by the accumulated water or the materials dropped from the holes (3 ) superior.
En la figura 5 se muestra un Barreno Sintético (1) instalado, en un barreno (3), perforado en un terreno (2) con fallas (6) y listo para ser cargado con material explosivo a granel. En la figura 6 se muestra un Barreno Sintético (1) instalado desacopladamente, creando una cámara de aire (8), en un barreno (3) periférico de techo o pared, hecho en unFigure 5 shows a Synthetic Hole (1) installed, in a hole (3), drilled in a ground (2) with faults (6) and ready to be loaded with bulk explosive material. Figure 6 shows a Synthetic Hole (1) installed uncoupled, creating an air chamber (8), in a peripheral ceiling or wall hole (3), made in a
terreno (2) flojo y listo para ser cargado con material explosivo a granel y que generará una voladura amortiguada. land (2) loose and ready to be loaded with explosive material in bulk and that will generate a damped blasting.

Claims

REIVINDICACIONESHabiendo descrito suficientemente mi modelo de utilidad, reclamo como de mi propiedad exclusiva, lo contenido a continuación: CLAIMS Having sufficiently described my utility model, claim as my exclusive property, the following content:
1. Barreno Sintético (1) caracterizado por un tubo de plástico semi rígido, recto, cilindrico, alargado, de pared delgada, antiestático, abierto en uno de sus extremos (10) y sellado (9) por el otro extremo.1. Synthetic hole (1) characterized by a semi rigid, straight, cylindrical, elongated, thin-walled, antistatic plastic tube, open at one end (10) and sealed (9) at the other end.
2. Barreno sintético de acuerdo a la reivindicación 1, caracterizado porque el extremo sellado (9) tiene forma preferentemente ovalada.2. Synthetic hole according to claim 1, characterized in that the sealed end (9) is preferably oval shaped.
3. Barreno sintético de acuerdo a la reivindicación 1, caracterizado porque el extremo sellado (9) tiene forma preferentemente angulada.3. Synthetic bore according to claim 1, characterized in that the sealed end (9) is preferably angled.
4. Barreno sintético de acuerdo a la reivindicación 1, caracterizado porque el extremo sellado (9) tiene forma preferentemente plana. 4. Synthetic hole according to claim 1, characterized in that the sealed end (9) is preferably flat.
5. Barreno sintético de acuerdo a la reivindicación 1, caracterizado porque el extremo sellado (9) es hermético al agua. 5. Synthetic bore according to claim 1, characterized in that the sealed end (9) is water tight.
PCT/MX2006/000064 2005-07-01 2006-06-30 Synthetic bore WO2007004857A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
MXNL/U/2005/000026 2005-07-01
MXNL05000026 2005-07-01

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101660890B (en) * 2008-08-27 2012-08-22 鞍钢集团矿业公司 Method for demolishing surface mine underground reinforced concrete constructional work by blasting
CN102678120A (en) * 2012-05-18 2012-09-19 河南大有能源股份有限公司 Method for releasing pressure and removing danger of rock burst
US11236974B2 (en) 2017-10-03 2022-02-01 Fabriser, S.A. De C.V. Anti-static, folding container for blasting operations, which can be partially compressed, and associated accessories

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3509820A (en) * 1967-10-09 1970-05-05 Hercules Inc Seismic charge assembly,seismic charge primer,and method and system exploration
GB2186954A (en) * 1986-02-19 1987-08-26 Forrester Thomas Dobson Explosives container

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3509820A (en) * 1967-10-09 1970-05-05 Hercules Inc Seismic charge assembly,seismic charge primer,and method and system exploration
GB2186954A (en) * 1986-02-19 1987-08-26 Forrester Thomas Dobson Explosives container

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101660890B (en) * 2008-08-27 2012-08-22 鞍钢集团矿业公司 Method for demolishing surface mine underground reinforced concrete constructional work by blasting
CN102678120A (en) * 2012-05-18 2012-09-19 河南大有能源股份有限公司 Method for releasing pressure and removing danger of rock burst
US11236974B2 (en) 2017-10-03 2022-02-01 Fabriser, S.A. De C.V. Anti-static, folding container for blasting operations, which can be partially compressed, and associated accessories

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