WO2023002421A1 - Blast hole device - Google Patents

Blast hole device Download PDF

Info

Publication number
WO2023002421A1
WO2023002421A1 PCT/IB2022/056731 IB2022056731W WO2023002421A1 WO 2023002421 A1 WO2023002421 A1 WO 2023002421A1 IB 2022056731 W IB2022056731 W IB 2022056731W WO 2023002421 A1 WO2023002421 A1 WO 2023002421A1
Authority
WO
WIPO (PCT)
Prior art keywords
blast hole
side wall
receptacle
insulating side
composite insulating
Prior art date
Application number
PCT/IB2022/056731
Other languages
French (fr)
Inventor
Louis Christiaan KOEKEMOER
Original Assignee
Koekemoer Louis Christiaan
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 Koekemoer Louis Christiaan filed Critical Koekemoer Louis Christiaan
Publication of WO2023002421A1 publication Critical patent/WO2023002421A1/en

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42D—BLASTING
    • F42D5/00—Safety arrangements
    • F42D5/04—Rendering explosive charges harmless, e.g. destroying ammunition; Rendering detonation of explosive charges harmless
    • F42D5/045—Detonation-wave absorbing or damping means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42D—BLASTING
    • F42D1/00—Blasting methods or apparatus, e.g. loading or tamping
    • F42D1/02—Arranging blasting cartridges to form an assembly
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
    • E21D9/006—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries by making use of blasting methods
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B3/00—Blasting cartridges, i.e. case and explosive
    • F42B3/28—Cartridge cases characterised by the material used, e.g. coatings

Definitions

  • This invention relates to a blast hole receptacle and a blast hole device.
  • the invention also relates to a blast hole device installation.
  • the invention is expected to be particularly advantageously applicable to blasting in open-cast mining such as coal mining. Accordingly, such applications should particularly, but not exclusively, be borne in mind when considering this specification.
  • blasting in mining is conducted by inserting charges into blast holes for later detonation.
  • Such charges are typically made of an Ammonium Nitrate and Diesel mixture.
  • an array of blast holes is usually drilled and filled with charges for the later synchronous detonation of the charges.
  • the time lapse between the inserting of charges and the actual detonation process poses a risk of uncontrolled spontaneous combustion or explosion of charges due to ambient subsoil temperature conditions of the blast holes.
  • the present invention aims to overcome this risk by providing a device for stabilizing the thermal condition of explosive charge loads.
  • a blast hole receptacle having at least one insulated side wall.
  • the blast hole receptacle may include an insulating base and an open top.
  • a blast hole receptacle which includes: at least one insulating side wall; an insulating base; and an open top having a circumferential top edge.
  • the blast hole receptacle may be substantially tubular.
  • the at least one insulating side wall may include any one or more of: a layered insulating side wall and a composite insulating side wall.
  • the insulating base may include any one or more of: a layered insulating base and a composite insulating base.
  • the layered insulating side wall may include at least one fluid or semi-solid layer.
  • the layered insulating side wall may include at least one air layer.
  • the at least one semi-solid layer may include a gel layer.
  • the gel layer may include a gel of which the main ingredient is Potassium Polyacrylate.
  • the Potassium Polyacrylate-based gel may be mixed with a number of others to ensure its heat-reducing properties.
  • the at least one insulating side wall may be of stiffened paper construction.
  • the insulating base may be of plastic construction, for example moulded plastic construction.
  • the at least one insulating side wall and insulating base may be integrally formed as a unitary construction.
  • a blast hole device which includes: a nested plurality of blast hole receptacles of decreasing size as hereinbefore described.
  • the blast hole device may include a round for locating the open tops of the nested plurality of blast hole receptacles.
  • the round may include a corresponding number of annular recesses wherein the circumferential top edges of the nested plurality of blast hole receptacles are located.
  • the number of annular recesses may be provided by corresponding profiles in the round and wherein the circumferential top edges are received.
  • the round may be a spacer round.
  • the spacer round may define a lid for operative closing of the open top of at least one of the blast hole receptacles.
  • the spacer round may be of plastic construction, for example moulded plastic construction.
  • a blast hole device installation which includes: drilling a blast hole; inserting the blast hole device into the blast hole; and placing an explosive charge in the blast hole device.
  • the blast hole device may be pre-manufactured off-site and transported to the blast site to facilitate and speed up blasting operations.
  • Figure 1 illustrates, schematically, a three-dimensional view of a blast hole device in accordance with one aspect of the invention.
  • Figure 2 shows a sectional side view of the blast hole device of figure 1 according to another aspect of the invention.
  • Figure 3 shows, schematically, a three-dimensional exploded view of the blast hole device in accordance with yet another aspect of the invention.
  • reference numeral 10 denotes, generally, a blast hole device in accordance with one embodiment of the invention.
  • the blast hole device 10 is shown here in its assembled form and comprises a nested plurality of blast hole receptacles of decreasing size, of which only an outer blast hole receptacle 12 can be seen here.
  • the outer blast hole receptacle 12 includes an insulating side wall 14, an insulating base 16, an open top 18 having a circumferential edge 20, and a spacer round 22 for locating the circumferential edge 20.
  • reference numeral (30) denotes generally a sectional side view of the blast hole device (10) of figure 1.
  • the blast hole device (30) comprises a nested plurality of blast hole receptacles of decreasing size, which, in this particular embodiment amounts to three blast hole receptacles namely an outer blast hole receptacle (12) having a layered insulating side wall (14) filled with a gel, an insulating base (16), and a circumferential top edge (20); a smaller blast hole receptacle (32) having a layered insulating side wall (36) filled with a gel, an insulating base (40), and a circumferential top edge (42); and a still smaller blast hole receptacle (34) having a layered insulating side wall (38) filled with a gel, an insulating base (44), and a circumferential top edge (46).
  • the blast hole device (30) has a spacer round in the form of a plastic moulded spacer round (22) which includes a corresponding number of annular recesses wherein the circumferential top edges (20), (42) and (46) of the nested plurality of blast hole receptacles (12), (32) and (34) are located.
  • the number of annular recesses is provided by corresponding profiles in the spacer round (22) wherein the circumferential top edges (20), (42) and (46) are received.
  • numeral (50) denotes an exploded three- dimensional view of the blast hole device (30) of figure 2.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Insulating Bodies (AREA)

Abstract

A blast hole device which includes a nested plurality of substantially tubular blast hole receptacles of decreasing dimensions, each blast hole receptacle having an insulating side wall, a base, an open top, and a spacer round located in the open tops of the nested plurality of blast hole receptacles.

Description

BLAST HOLE DEVICE
This invention relates to a blast hole receptacle and a blast hole device. The invention also relates to a blast hole device installation.
The invention is expected to be particularly advantageously applicable to blasting in open-cast mining such as coal mining. Accordingly, such applications should particularly, but not exclusively, be borne in mind when considering this specification.
BACKGROUND OF THE INVENTION:
Generally, blasting in mining is conducted by inserting charges into blast holes for later detonation. Such charges are typically made of an Ammonium Nitrate and Diesel mixture.
To streamline the blasting process, an array of blast holes is usually drilled and filled with charges for the later synchronous detonation of the charges. In such scenarios, the time lapse between the inserting of charges and the actual detonation process poses a risk of uncontrolled spontaneous combustion or explosion of charges due to ambient subsoil temperature conditions of the blast holes.
The inventor has identified a need for reducing the risk of premature detonation during blasting preparations. Accordingly, the present invention aims to overcome this risk by providing a device for stabilizing the thermal condition of explosive charge loads. SUMMARY OF THE INVENTION:
In accordance with the invention generally, there is provided a blast hole receptacle having at least one insulated side wall.
The blast hole receptacle may include an insulating base and an open top.
More particularly, according to a first aspect of the invention, there is provided a blast hole receptacle which includes: at least one insulating side wall; an insulating base; and an open top having a circumferential top edge.
The blast hole receptacle may be substantially tubular.
The at least one insulating side wall may include any one or more of: a layered insulating side wall and a composite insulating side wall. Likewise, the insulating base may include any one or more of: a layered insulating base and a composite insulating base.
The layered insulating side wall may include at least one fluid or semi-solid layer.
The layered insulating side wall may include at least one air layer.
The at least one semi-solid layer may include a gel layer.
The gel layer may include a gel of which the main ingredient is Potassium Polyacrylate. The Potassium Polyacrylate-based gel may be mixed with a number of others to ensure its heat-reducing properties. The at least one insulating side wall may be of stiffened paper construction.
The insulating base may be of plastic construction, for example moulded plastic construction.
The at least one insulating side wall and insulating base may be integrally formed as a unitary construction.
According to another aspect of the invention there is provided a blast hole device which includes: a nested plurality of blast hole receptacles of decreasing size as hereinbefore described.
The blast hole device may include a round for locating the open tops of the nested plurality of blast hole receptacles.
To this end, the round may include a corresponding number of annular recesses wherein the circumferential top edges of the nested plurality of blast hole receptacles are located. To this end, the number of annular recesses may be provided by corresponding profiles in the round and wherein the circumferential top edges are received.
The round may be a spacer round.
The spacer round may define a lid for operative closing of the open top of at least one of the blast hole receptacles.
The spacer round may be of plastic construction, for example moulded plastic construction.
According to another aspect of the invention there is provided a blast hole device installation which includes: drilling a blast hole; inserting the blast hole device into the blast hole; and placing an explosive charge in the blast hole device.
Advantageously, the blast hole device may be pre-manufactured off-site and transported to the blast site to facilitate and speed up blasting operations.
The invention is now described, by way of non-limiting example, with reference to the accompanying diagrammatic drawings.
DRAWINGS:
In the drawings,
Figure 1 illustrates, schematically, a three-dimensional view of a blast hole device in accordance with one aspect of the invention.
Figure 2 shows a sectional side view of the blast hole device of figure 1 according to another aspect of the invention.
Figure 3 shows, schematically, a three-dimensional exploded view of the blast hole device in accordance with yet another aspect of the invention.
In the drawings, like reference numerals denote like parts unless otherwise indicated.
DETAILED DESCRIPTION OF THE INVENTION:
In figure 1, reference numeral 10 denotes, generally, a blast hole device in accordance with one embodiment of the invention. The blast hole device 10 is shown here in its assembled form and comprises a nested plurality of blast hole receptacles of decreasing size, of which only an outer blast hole receptacle 12 can be seen here. The outer blast hole receptacle 12 includes an insulating side wall 14, an insulating base 16, an open top 18 having a circumferential edge 20, and a spacer round 22 for locating the circumferential edge 20. With reference to figure 2 of the drawings, reference numeral (30) denotes generally a sectional side view of the blast hole device (10) of figure 1. The blast hole device (30) comprises a nested plurality of blast hole receptacles of decreasing size, which, in this particular embodiment amounts to three blast hole receptacles namely an outer blast hole receptacle (12) having a layered insulating side wall (14) filled with a gel, an insulating base (16), and a circumferential top edge (20); a smaller blast hole receptacle (32) having a layered insulating side wall (36) filled with a gel, an insulating base (40), and a circumferential top edge (42); and a still smaller blast hole receptacle (34) having a layered insulating side wall (38) filled with a gel, an insulating base (44), and a circumferential top edge (46). The blast hole device (30) has a spacer round in the form of a plastic moulded spacer round (22) which includes a corresponding number of annular recesses wherein the circumferential top edges (20), (42) and (46) of the nested plurality of blast hole receptacles (12), (32) and (34) are located. To this end, the number of annular recesses is provided by corresponding profiles in the spacer round (22) wherein the circumferential top edges (20), (42) and (46) are received.
Turning to figure 3 of the drawings, numeral (50) denotes an exploded three- dimensional view of the blast hole device (30) of figure 2.

Claims

CLAIMS:
1. A blast hole receptacle which includes: at least one insulating side wall; an insulating base; and an open top having a circumferential top edge.
2. A blast hole receptacle as claimed in claim 1 that is substantially tubular.
3. A blast hole receptacle as claimed in claim 2 wherein the at least one insulating side wall is a composite insulating side wall.
4. A blast hole receptacle as claimed in claim 3 of which the composite insulating side wall includes at least one semi-solid layer.
5. A blast hole receptacle as claimed in claim 4 of which the composite insulating side wall includes at least one air layer.
6. A blast hole receptacle as claimed in claim 5 of which the semi-solid layer is a gel layer.
7. A blast hole receptacle as claimed in claim 6 wherein the gel layer contains Potassium Polyacrylate.
8. A blast hole receptacle as claimed in claim 7 of which the composite insulating side wall is of stiffened paper construction.
9. A blast hole receptacle as claimed in claim 8 wherein the insulating base is made of plastic and the composite insulating side wall is integrally formed with the insulating base.
10. A blast hole receptacle as claimed in claim 3 of which the composite insulating side wall includes at least one fluid layer.
11. A blast hole receptacle as claimed in claim 10 of which the composite insulating side wall includes at least one air layer.
12. A blast hole receptacle as claimed in claim 11 of which the composite insulating side wall is of stiffened paper construction.
13. A blast hole receptacle as claimed in claim 12 wherein the insulating base is made of plastic and the composite insulating side wall is integrally formed with the insulating base.
14. A blast hole device which includes a nested plurality of substantially tubular blast hole receptacles of decreasing dimensions, each blast hole receptacle having: at least one insulating side wall; an insulating base; and an open top with a circumferential top edge.
15. A blast hole device as claimed in claim 14 which includes a spacer round for locating the open tops of the nested plurality of blast hole receptacles.
16. A blast hole device as claimed in claim 15 wherein the spacer round includes a corresponding number of annular recesses wherein the circumferential top edges of the plurality of blast hole receptacles are located.
17. A blast hole device as claimed in claim 16 wherein the number of annular recesses are provided by corresponding profiles in the spacer round and wherein the circumferential top edges are seated.
18. A blast hole device as claimed in claim 17 wherein the spacer round defines a lid for operative closing of the open top of at least one of the blast hole receptacles.
19. A blast hole device as claimed in claim 17 wherein the spacer round is of plastic construction.
20. A blast hole device as claimed in claim 18 wherein the at least one insulating side wall is a composite insulating side wall that has at least one semi-solid layer.
21. A blast hole receptacle as claimed in claim 20 of which the composite insulating side wall includes at least one air layer.
22. A blast hole receptacle as claimed in claim 21 of which the semi-solid layer is a gel layer.
23. A blast hole receptacle as claimed in claim 22 wherein the gel layer contains Potassium Polyacrylate.
24. A blast hole receptacle as claimed in claim 23 of which the composite insulating side wall is of stiffened paper construction.
25. A blast hole receptacle as claimed in claim 24 wherein the insulating base is made of plastic and the composite insulating side wall is integrally formed with the insulating base.
26. A blast hole receptacle as claimed in claim 18 wherein the at least one insulating side wall is a composite insulating side wall that has at least one fluid layer.
27. A blast hole receptacle as claimed in claim 26 of which the composite insulating side wall includes at least one air layer.
28. A blast hole receptacle as claimed in claim 27 of which the composite insulating side wall is of stiffened paper construction.
29. A blast hole receptacle as claimed in claim 28 wherein the insulating base is made of plastic and the composite insulating side wall is integrally formed with the insulating base.
30. A blast hole device installation which includes: drilling a blast hole; inserting a blast hole device as claimed in claim 23 or claim 27 into the blast hole; and placing an explosive charge in the blast hole device.
31. A blast hole receptacle as claimed in claim 1 , substantially as herein described and illustrated.
32. A blast hole device as claimed in claim 14, substantially as herein described and illustrated.
33. A new blast hole receptacle substantially as herein described.
34. A new blast hole device substantially as herein described.
PCT/IB2022/056731 2021-07-21 2022-07-21 Blast hole device WO2023002421A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ZA202105125 2021-07-21
ZA2021/05125 2021-07-21

Publications (1)

Publication Number Publication Date
WO2023002421A1 true WO2023002421A1 (en) 2023-01-26

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ID=84979141

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Application Number Title Priority Date Filing Date
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115929329A (en) * 2023-02-07 2023-04-07 中国矿业大学 Deep rock blasting damage control method based on multi-level energy regulation and control

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4429632A (en) * 1981-04-27 1984-02-07 E. I. Du Pont De Nemours & Co. Delay detonator
US4696231A (en) * 1986-02-25 1987-09-29 E. I. Du Pont De Nemours And Company Shock-resistant delay detonator
US20130319277A1 (en) * 2011-02-21 2013-12-05 Geum Won Cho Blasting Method Using a Control Device for Inducing a Blast Pressure, and Control Device for Inducing the Blast Pressure to Apply the Method
US20160138899A1 (en) * 2013-06-17 2016-05-19 Allen Park Blasting systems and methods
CN107990796A (en) * 2017-11-27 2018-05-04 辽宁工程技术大学 A kind of flame range shot hole blasting pack intelligence heat-proof device
CN111412799A (en) * 2020-04-27 2020-07-14 辽宁科技大学 Energy-gathering heat-insulation temperature control device for high-temperature blasting and use method thereof

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4429632A (en) * 1981-04-27 1984-02-07 E. I. Du Pont De Nemours & Co. Delay detonator
US4696231A (en) * 1986-02-25 1987-09-29 E. I. Du Pont De Nemours And Company Shock-resistant delay detonator
US20130319277A1 (en) * 2011-02-21 2013-12-05 Geum Won Cho Blasting Method Using a Control Device for Inducing a Blast Pressure, and Control Device for Inducing the Blast Pressure to Apply the Method
US20160138899A1 (en) * 2013-06-17 2016-05-19 Allen Park Blasting systems and methods
CN107990796A (en) * 2017-11-27 2018-05-04 辽宁工程技术大学 A kind of flame range shot hole blasting pack intelligence heat-proof device
CN111412799A (en) * 2020-04-27 2020-07-14 辽宁科技大学 Energy-gathering heat-insulation temperature control device for high-temperature blasting and use method thereof

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115929329A (en) * 2023-02-07 2023-04-07 中国矿业大学 Deep rock blasting damage control method based on multi-level energy regulation and control

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