WO2022157567A1 - A blast-limiting installation and method - Google Patents

A blast-limiting installation and method Download PDF

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Publication number
WO2022157567A1
WO2022157567A1 PCT/IB2021/058980 IB2021058980W WO2022157567A1 WO 2022157567 A1 WO2022157567 A1 WO 2022157567A1 IB 2021058980 W IB2021058980 W IB 2021058980W WO 2022157567 A1 WO2022157567 A1 WO 2022157567A1
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WO
WIPO (PCT)
Prior art keywords
blast
container
installation
liquid
fractured
Prior art date
Application number
PCT/IB2021/058980
Other languages
French (fr)
Inventor
Roelof Petrus MARTINS
Original Assignee
Martins Roelof Petrus
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 Martins Roelof Petrus filed Critical Martins Roelof Petrus
Publication of WO2022157567A1 publication Critical patent/WO2022157567A1/en
Priority to ZA2022/10108A priority Critical patent/ZA202210108B/en

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
    • E21F5/00—Means or methods for preventing, binding, depositing, or removing dust; Preventing explosions or fires
    • E21F5/14—Fluid barriers or rock dusters made to work by, or at the same time as, shots or explosions
    • E21F5/143—Fluid barriers

Definitions

  • the invention relates to a blast-limiting installation and method which may find particular application in opencast mines and underground or contained and construction blasting.
  • the Inventor has experience with blasting, particularly in opencast and underground mines including blasting for construction. Much of the work around blast safety relates to limiting damage (e.g., damage to environment and property and/or injury/death to people) caused by the blast, which is obviously important.
  • damage e.g., damage to environment and property and/or injury/death to people
  • the Inventor desires an installation and method which addresses another - often overlooked - issue with blasting: limiting or containing of the dust and other small particles which emanate from a blast site, and to improve the fragmentation of the material during the blast. This is particularly problematic in opencast mining, Construction Sites, and underground Mining in enclosed spaces, where the dust cannot easily be Contained in open spaces & vented externally, although is generally a problem associated with all or most blasting activities.
  • the invention provides a blast-limiting installation which includes: at least one frangible or fracturable container placed at blast site nearby a contemplated blast at a position where it will be exposed to a shockwave or other impact from the blast and will likely be fractured; and a liquid provided inside the container, wherein when the container is fractured, the liquid will be released and will absorb at least some particulate matter emanating from the blast.
  • the installation may reduce the dust emissions or blasting fumes caused by the blast that is harmful for the environment.
  • a downward force may be created, improving the fragmentation of the materials.
  • dust emissions may include particles derived from the environment, like fragmented rocks and sand, which may become airborne.
  • blasting fumes may include fumes, chemical emissions, or other gases emanating from the blast (e.g., from explosive chemicals or compounds used to create the blast),
  • the container may be placed on top of, adjacent, or around the blast site.
  • the containers may be in the form of large plastic packets or bags.
  • the packets may be of polyethylene, e.g., low-density polyethylene (LDPE, LLDPE) or high-density polyethylene (HDPE) or similar polymer.
  • the packets may be single use, being intended to be damaged or destroyed by the blast. Instead, the installation may include a large single container, e.g., made of polyethylene terephthalate (PET), Polypropylene (PP), Polycarbonate (PC), or other polymer.
  • PET polyethylene terephthalate
  • PP Polypropylene
  • PC Polycarbonate
  • the containers may be arranged to form a wall or barrier, e.g., on top of the blast at least in an area in which the particulate matter is believed to be propelled/projected.
  • the containers may be in addition to any existing blast-containing equipment (e.g., blast walls, barriers, etc.).
  • the liquid provided in the container may be water or primarily water (even “dirty” water).
  • the liquid in the container may include an additive to assist with the absorption/capturing of the particulate matter.
  • the liquid may include a binder, flocculant, etc.
  • the installation may just be placed on top of the blast like a large water balloon, and/or may include a mounting arrangement like a framework or scaffolding, intended to support a single container or plural containers in a predefined orientation (e.g., a curved or planar wall, blanket, a screen or barrier, etc.).
  • the mounting arrangement may be intended to be reusable or sacrificial.
  • the mounting arrangement may define mounting formations for mounting, e.g., laying or hanging, the containers.
  • the liquid may have some influence in reducing or attenuating the blast impact or shock wave, although this may not be a primary intention of the installation.
  • the particulate matter may be dust or other small particles, e.g., sand, micro particles, rock splitters/debris, fines, etc.
  • the invention extends to a blast-limiting method including: placing at least one frangible or fracturable container at blast site nearby a contemplated blast at a position where it will be exposed to a shockwave or other impact from the blast and will likely be fractured; and providing a liquid inside the container, wherein when the container is fractured, the liquid will be released and will absorb at least some particulate matter emanating from the blast.
  • the method may include causing the blast or detonating an explosive, fracturing the container.
  • the method may include capturing at least some of the dust caused by the blast by the liquid.
  • the method may be implemented by the installation defined above.
  • FIG. 1 shows a schematic view of an installation in accordance with the invention, before a blast
  • FIG. 2 shows a schematic view of the installation of FIG. 1 , during the blast;
  • FIG. 3 shows a schematic view of the installation of FIG. 1 , after the blast;
  • FIG. 4 shows a schematic view of a series of “time-lapse” images of an explosion in accordance with PRIOR ART techniques
  • FIG. 5 shows a schematic view of a series of “time-lapse” images, in the same sequence as those of FIG. 4, of an explosion using the installation of FIG. 1 .
  • FIG. 1 illustrates an installation 100 in accordance with the invention.
  • a blast site 102 is provided where controlled blasting or detonation of explosives is to occur. This may be in a mine, in construction, or in demolition. In this example, the blast site 102 is in an opencast mine.
  • the blast site 102 incorporates a rock wall 104, bedrock, or similar hard structure which is to be blasted, e.g., to expose new ore or allow for new building or through- passage.
  • a rock wall 104 bedrock, or similar hard structure which is to be blasted, e.g., to expose new ore or allow for new building or through- passage.
  • holes 106 are drilled into the rock wall 104 and explosives 108 are placed into the holes. This may all be done in accordance with existing blasting protocols and safety procedures.
  • a container 110 of liquid 112 is placed on top of the blast site 102 in an intended path of a shock wave, pressure wave, or debris path of the blast.
  • a mounting arrangement 1 14 may be provided to support, locate, or mount the container 1 10 in position.
  • the container 110 is frangible or fracturable.
  • the container 1 10 is illustrated in this example as a single large container which is one example embodiment. Instead, in another example embodiment, it may be a series of smaller containers, e.g., plastic bags.
  • the liquid 112 is placed inside the container 110, so that when the container 110 breaks, the liquid 112 will be released and will absorb, or be mixed with, some particulate matter emanating from the blast.
  • the liquid 112 may be water. While there are various options and additives that may be added to the water and might make it more effective, plain water (or even run-off or drainage water often present in mines) might be most cost-effective.
  • FIG. 1 illustrates the installation 100 set up prior to blast.
  • FIG. 1 illustrates the installation 100 set up prior to blast.
  • FIG. 2 illustrates during a blast, wherein the explosives 108 have been detonated causing an explosion 202 resulting in a shock wave 204 propagating outwardly from the explosion 202.
  • the shock wave 204 propagates towards the container 110 and interacts with - or hits - the container 110.
  • the shock wave 204 usually carries with it, or leads, large amounts of dust, blasting fumes, and particulate matter emanating, sometimes at high speed, from the explosion 202.
  • the shock wave 204 causes the container 110 to break (because the container 1 10 is fragile or breakable) which releases the liquid 112 within the container - the remnants of the broken container are represented by numeral 302 in FIG. 3.
  • the liquid 1 12 is now exposed to the dust and fumes that were carried with, or followed, the shock wave 204.
  • the dust and fumes interact (e.g., collides) with the liquid 112 to form a suspension or mixture which, in the case of water and plain dust, will be in the form of mud 304 or have a mud-like consistency.
  • shock wave the precise physical phenomenon causing the container 110 to fracture may instead be a pressure wave, mechanical impact from blast debris, etc., although the exact phenomenon is not germane to the invention; rather, the principle of breaking the container 110 responsive to the explosion 202 is.
  • FIGS 4-5 illustrate a like-for-like comparison of an example of the invention (FIG. 5) relative to the PRIOR ART (FIG. 4).
  • FIGS 4-5 show four “time-lapse” images (a)- (d) as follows:
  • FIG. 5 shows the same time-lapse sequence of images (a) - (d) but using the container 110, the blast site of FIG. 5 thus constituting an embodiment of the installation 100 as illustrated in FIG. 1 .
  • the blast (image (b)) causes the container to rupture, releasing its liquid which interacts with the particles projected by the blast.
  • This combination creates mud, or a mud-like substance, to be formed around the blast area. While some particles will likely still escape the liquid (resulting in some dust and/or debris), overall, there will be less, usually significantly less, dust and debris expelled from the blast site, when using the container 110. Further, the mud of FIG. 5 will usually be contained in a smaller area then the debris of FIG. 4.
  • a blast radius (or effective reach of the blast) may be reduced, leading to generally safer blasting conditions.

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  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Emergency Lowering Means (AREA)

Abstract

A blast-limiting installation (100) includes at least one frangible or fracturable container (110) placed at blast site nearby a contemplated blast (202) at a position where it will be exposed to a shockwave (204) or other impact from the blast (202), the container (110) configured to be fractured or broken by the blast (202). The installation also includes a liquid (112) provided inside the container ( 110), the container (110) being configured such that that, when it is fractured, the liquid (112) is released and absorbs at least some particulate matter emanating from the blast (202).

Description

A Blast-Limiting Installation and Method
FIELD OF INVENTION
The invention relates to a blast-limiting installation and method which may find particular application in opencast mines and underground or contained and construction blasting.
BACKGROUND OF INVENTION
The Inventor has experience with blasting, particularly in opencast and underground mines including blasting for construction. Much of the work around blast safety relates to limiting damage (e.g., damage to environment and property and/or injury/death to people) caused by the blast, which is obviously important.
However, the Inventor desires an installation and method which addresses another - often overlooked - issue with blasting: limiting or containing of the dust and other small particles which emanate from a blast site, and to improve the fragmentation of the material during the blast. This is particularly problematic in opencast mining, Construction Sites, and underground Mining in enclosed spaces, where the dust cannot easily be Contained in open spaces & vented externally, although is generally a problem associated with all or most blasting activities. SUMMARY OF INVENTION
Accordingly, the invention provides a blast-limiting installation which includes: at least one frangible or fracturable container placed at blast site nearby a contemplated blast at a position where it will be exposed to a shockwave or other impact from the blast and will likely be fractured; and a liquid provided inside the container, wherein when the container is fractured, the liquid will be released and will absorb at least some particulate matter emanating from the blast.
The installation may reduce the dust emissions or blasting fumes caused by the blast that is harmful for the environment. By placing the container on top of the blast, a downward force may be created, improving the fragmentation of the materials.
The term “dust emissions” may include particles derived from the environment, like fragmented rocks and sand, which may become airborne. The term “blasting fumes” may include fumes, chemical emissions, or other gases emanating from the blast (e.g., from explosive chemicals or compounds used to create the blast),
The container may be placed on top of, adjacent, or around the blast site.
There may be plural containers. The containers may be in the form of large plastic packets or bags. The packets may be of polyethylene, e.g., low-density polyethylene (LDPE, LLDPE) or high-density polyethylene (HDPE) or similar polymer. The packets may be single use, being intended to be damaged or destroyed by the blast. Instead, the installation may include a large single container, e.g., made of polyethylene terephthalate (PET), Polypropylene (PP), Polycarbonate (PC), or other polymer. The containers may be arranged to form a wall or barrier, e.g., on top of the blast at least in an area in which the particulate matter is believed to be propelled/projected. The containers may be in addition to any existing blast-containing equipment (e.g., blast walls, barriers, etc.).
The liquid provided in the container may be water or primarily water (even “dirty” water). The liquid in the container may include an additive to assist with the absorption/capturing of the particulate matter. The liquid may include a binder, flocculant, etc.
The installation may just be placed on top of the blast like a large water balloon, and/or may include a mounting arrangement like a framework or scaffolding, intended to support a single container or plural containers in a predefined orientation (e.g., a curved or planar wall, blanket, a screen or barrier, etc.). The mounting arrangement may be intended to be reusable or sacrificial. The mounting arrangement may define mounting formations for mounting, e.g., laying or hanging, the containers.
The liquid may have some influence in reducing or attenuating the blast impact or shock wave, although this may not be a primary intention of the installation.
The particulate matter may be dust or other small particles, e.g., sand, micro particles, rock splitters/debris, fines, etc.
The invention extends to a blast-limiting method including: placing at least one frangible or fracturable container at blast site nearby a contemplated blast at a position where it will be exposed to a shockwave or other impact from the blast and will likely be fractured; and providing a liquid inside the container, wherein when the container is fractured, the liquid will be released and will absorb at least some particulate matter emanating from the blast. The method may include causing the blast or detonating an explosive, fracturing the container. The method may include capturing at least some of the dust caused by the blast by the liquid. The method may be implemented by the installation defined above.
BRIEF DESCRIPTION OF DRAWINGS
The invention will now be further described, by way of example, with reference to the accompanying diagrammatic drawings.
In the drawings:
FIG. 1 shows a schematic view of an installation in accordance with the invention, before a blast;
FIG. 2 shows a schematic view of the installation of FIG. 1 , during the blast;
FIG. 3 shows a schematic view of the installation of FIG. 1 , after the blast;
FIG. 4 shows a schematic view of a series of “time-lapse” images of an explosion in accordance with PRIOR ART techniques; and
FIG. 5 shows a schematic view of a series of “time-lapse” images, in the same sequence as those of FIG. 4, of an explosion using the installation of FIG. 1 .
DETAILED DESCRIPTION OF EXAMPLE EMBODIMENT
The following description of an example embodiment of the invention is provided as an enabling teaching of the invention. Those skilled in the relevant art will recognise that changes can be made to the example embodiment described, while still attaining the beneficial results of the present invention. It will also be apparent that some of the desired benefits of the present invention can be attained by selecting some of the features of the example embodiment without utilising other features. Accordingly, those skilled in the art will recognise that modifications and adaptations to the example embodiment are possible and can even be desirable in certain circumstances and are a part of the present invention. Thus, the following description of the example embodiment is provided as illustrative of the principles of the present invention and not a limitation thereof.
FIG. 1 illustrates an installation 100 in accordance with the invention. A blast site 102 is provided where controlled blasting or detonation of explosives is to occur. This may be in a mine, in construction, or in demolition. In this example, the blast site 102 is in an opencast mine.
The blast site 102 incorporates a rock wall 104, bedrock, or similar hard structure which is to be blasted, e.g., to expose new ore or allow for new building or through- passage. T ypically, holes 106 are drilled into the rock wall 104 and explosives 108 are placed into the holes. This may all be done in accordance with existing blasting protocols and safety procedures.
However, in accordance with the invention, a container 110 of liquid 112 is placed on top of the blast site 102 in an intended path of a shock wave, pressure wave, or debris path of the blast. If desired, a mounting arrangement 1 14 may be provided to support, locate, or mount the container 1 10 in position. The container 110 is frangible or fracturable.
The container 1 10 is illustrated in this example as a single large container which is one example embodiment. Instead, in another example embodiment, it may be a series of smaller containers, e.g., plastic bags. The liquid 112 is placed inside the container 110, so that when the container 110 breaks, the liquid 112 will be released and will absorb, or be mixed with, some particulate matter emanating from the blast. In this example, the liquid 112 may be water. While there are various options and additives that may be added to the water and might make it more effective, plain water (or even run-off or drainage water often present in mines) might be most cost-effective. FIG. 1 illustrates the installation 100 set up prior to blast. FIG. 2 illustrates during a blast, wherein the explosives 108 have been detonated causing an explosion 202 resulting in a shock wave 204 propagating outwardly from the explosion 202. The shock wave 204 propagates towards the container 110 and interacts with - or hits - the container 110. The shock wave 204 usually carries with it, or leads, large amounts of dust, blasting fumes, and particulate matter emanating, sometimes at high speed, from the explosion 202.
The shock wave 204 causes the container 110 to break (because the container 1 10 is fragile or breakable) which releases the liquid 112 within the container - the remnants of the broken container are represented by numeral 302 in FIG. 3. The liquid 1 12 is now exposed to the dust and fumes that were carried with, or followed, the shock wave 204. The dust and fumes interact (e.g., collides) with the liquid 112 to form a suspension or mixture which, in the case of water and plain dust, will be in the form of mud 304 or have a mud-like consistency. (While the term “shock wave” is used, the Inventor notes that the precise physical phenomenon causing the container 110 to fracture may instead be a pressure wave, mechanical impact from blast debris, etc., although the exact phenomenon is not germane to the invention; rather, the principle of breaking the container 110 responsive to the explosion 202 is.)
FIGS 4-5 illustrate a like-for-like comparison of an example of the invention (FIG. 5) relative to the PRIOR ART (FIG. 4). FIGS 4-5 show four “time-lapse” images (a)- (d) as follows:
(a) is prior to detonation;
(b) is immediately after detonation;
(c) is during the blast following detonation; and
(d) is after the blast. ln FIG. 4, it will be noted that particles are projected a large distance from the blast (image (c)) and that after the blast (image (d)) debris, comprising primarily sand- and pebble-sized particles, is scattered all around and dust lingers in the air, which will eventually settle (wind-dependent).
In contrast, FIG. 5 shows the same time-lapse sequence of images (a) - (d) but using the container 110, the blast site of FIG. 5 thus constituting an embodiment of the installation 100 as illustrated in FIG. 1 . The blast (image (b)) causes the container to rupture, releasing its liquid which interacts with the particles projected by the blast.
This combination creates mud, or a mud-like substance, to be formed around the blast area. While some particles will likely still escape the liquid (resulting in some dust and/or debris), overall, there will be less, usually significantly less, dust and debris expelled from the blast site, when using the container 110. Further, the mud of FIG. 5 will usually be contained in a smaller area then the debris of FIG. 4.
There may be many advantages to capturing the dust in water:
• It may to reduce impact to the environment by reducing or eliminating dust contamination.
• Free-floating dust is tough and damaging on the environment and Animal and Humans health effecting their lungs (which is why many miners wear protective masks) and removing the dusk from the air will have enormous environmental and health benefits.
• It may reduce or eliminate blasting fumes released by the blast, which may be toxic or noxious, or merely undesirable.
• A blast radius (or effective reach of the blast) may be reduced, leading to generally safer blasting conditions.
• It may also improve the fragmentation of the rock during the blast due to the weight of the fracturable container adding a downward force on the blasting site containing the energy released downwards that will be released downwards and not upward in the air. This additional downwards energy will assist in the force of the blast and breaking up the of the material in better fragments.
• It may be easier to be removed as it can be washed, shovelled, or pumped away. • Reducing the impact that the dust have on the environment will also assist mines to reduce their environmental penalties and to contribute to a greener way of mining and saving the environment.

Claims

- 9 - CLAIMS
1. A blast-limiting installation which includes: at least one frangible or fracturable container placed at blast site nearby a contemplated blast at a position where it will be exposed to a shockwave or other impact from the blast, the container configured to be fractured or broken by the blast; and a liquid provided inside the container, the container being configured such that that, when it is fractured, the liquid is released and absorbs at least some particulate matter emanating from the blast.
2. The installation of claim 1 , wherein the container is placed at one or more of the following locations relative to the blast site: on top of; adjacent to; and/or around.
3. The installation of claim 1 , wherein there are plural containers.
4. The installation of claim 3, wherein the containers are in the form of plastic packets or bags.
5. The installation of claim 3, in which the containers are arranged to form a wall or barrier at least in and area in which the particulate matter is to be propelled/projected.
6. The installation of claim 1 , wherein the liquid provided in the container is water or primarily water.
7. The installation of claim 1 , which includes a mounting arrangement to support the container in a predefined orientation.
8. The installation of claim 7, wherein the mounting arrangement defines mounting formations for mounting the container.
9. A blast-limiting method including: placing at least one frangible or fracturable container at blast site nearby a contemplated blast at a position where it will be exposed to a shockwave or other impact from the blast, the container configured to be fractured or broken by the blast; and providing a liquid inside the container, the container being configured such that that, when it is fractured, the liquid is released and absorbs at least some particulate matter emanating from the blast.
10. The method as claimed in claim 9, which includes: causing the blast or detonating an explosive; fracturing the container due to the blast; and capturing at least some dust caused by the blast by the liquid.
PCT/IB2021/058980 2021-01-25 2021-09-30 A blast-limiting installation and method WO2022157567A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
ZA2022/10108A ZA202210108B (en) 2021-01-25 2022-09-12 A blast-limiting installation and method

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ZA202100489 2021-01-25
ZA2021/00489 2021-01-25

Publications (1)

Publication Number Publication Date
WO2022157567A1 true WO2022157567A1 (en) 2022-07-28

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2147481A1 (en) * 1995-03-09 2000-09-01 Ruhrkohle Ag Process and device for suspending and installing water troughs used as explosion barriers in underground mining and tunnel building
DE10361848A1 (en) * 2003-12-31 2005-08-04 Rag Ag Trough barrier for confining explosions in mining/tunnel structures has compact arrangement of troughs extending over at least third of maximum section width with explosive kits ignited by remote sensors to atomize extinguishing substances
DE102008023795A1 (en) * 2008-05-15 2009-11-19 Dr. Klaus Schulte Gmbh Chemisch-Technische Fabrikation Explosion barrier for e.g. underground mining, has hanger that is closed together with film tube at end side of hanger, and intermediate bar inserted in S-shaped hooks, where film tube is fused, stitched or stapled on hanger

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2147481A1 (en) * 1995-03-09 2000-09-01 Ruhrkohle Ag Process and device for suspending and installing water troughs used as explosion barriers in underground mining and tunnel building
DE10361848A1 (en) * 2003-12-31 2005-08-04 Rag Ag Trough barrier for confining explosions in mining/tunnel structures has compact arrangement of troughs extending over at least third of maximum section width with explosive kits ignited by remote sensors to atomize extinguishing substances
DE102008023795A1 (en) * 2008-05-15 2009-11-19 Dr. Klaus Schulte Gmbh Chemisch-Technische Fabrikation Explosion barrier for e.g. underground mining, has hanger that is closed together with film tube at end side of hanger, and intermediate bar inserted in S-shaped hooks, where film tube is fused, stitched or stapled on hanger

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