WO2005033618A1 - Blasting - Google Patents
Blasting Download PDFInfo
- Publication number
- WO2005033618A1 WO2005033618A1 PCT/IB2004/003196 IB2004003196W WO2005033618A1 WO 2005033618 A1 WO2005033618 A1 WO 2005033618A1 IB 2004003196 W IB2004003196 W IB 2004003196W WO 2005033618 A1 WO2005033618 A1 WO 2005033618A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- drill hole
- blasting
- layer
- plunger material
- lower layer
- Prior art date
Links
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
Definitions
- THIS INVENTION relates to blasting. It relates more specifically to blasting of rock or other material by means of a blasting substance charged into a drill hole extending into the rock or other material to be blasted.
- blasting is to be interpreted widely to cover, generally, destruction of rock or other material by means of pressure generating or shock wave generating substances such as explosives, propellants, or the like.
- blasting substance is to be interpreted to cover explosives, propellants and other pressure or shock wave generating substances.
- a method of charging a drill hole extending between a mouth thereof at a surface, and a blind end or bottom thereof remote from the mouth including providing in the drill hole at a relatively low level toward said bottom a lower layer of a blasting substance, and a lower layer of a plunger material proximately above the lower layer of blasting substance; providing in the drill hole at a relatively high level remote from said bottom a higher layer of a plunger material, spaced a predetermined distance above said lower layer of plunger material, and proximately above said higher layer of plunger material, a higher layer of a blasting substance; placing initiators in association with the respective layers of blasting substances and connecting the initiators to a controller for actuating the initiators at predetermined time intervals.
- the spacing between opposing surfaces of respectively said lower layer and said higher layer of plunger material may be of the same order of magnitude, i.e. between about 0,5 m and about 3 m.
- the respective layers of plunger material may be flowable material allowing placement in the drill hole at the respective desired positions. Drill cuttings are a preferred plunger material.
- Said relatively low level may be spatially adjacent a bottom of the drill hole and spaced above the bottom by a predetermined distance.
- the spacing may be between about 0,5 m and about 3 m, advantageously between about 1 m and about 2 m, preferably about 1 .5 m, but depending on several factors, such as the depth of the drill hole, the nature of the rock or other material to be blasted, the nature of the plunger material, the nature of the blasting substance, and the like.
- the method may include supporting in each respective case the layer of plunger material and the layer of blasting substance on a plug capable of being positioned in the drill hole at a predetermined level.
- the method may include providing plunger material below the lower layer of blasting substance to provide a lower composite layer, providing plunger material above the higher layer of blasting substance to provide a higher composite layer, and providing one or more further composite layers of blasting substance and plunger material in the drill hole, with spacings in-between, in series along the drill hole.
- the method may include tamping the drill hole proximate its mouth.
- the lower layer of blasting substance may be positioned proximate and may be supported on the bottom of the drill hole.
- a method of blasting a drill hole charged in accordance with the first aspect of this invention including actuating the initiators by means of the controller.
- the initiators may be actuated simultaneously. They may be actuated electrically or electronically. Instead, they may be actuated pyrotechnically.
- the invention extends in accordance with a third aspect to a method of mining including blasting an array of drill holes, each in accordance with the second aspect of this invention.
- the invention extends in accordance with a fourth aspect to a charged drill hole extending between a mouth thereof at a surface, and a blind end or bottom thereof remote from the mouth, including a lower layer of a blasting substance at a relatively high level toward said bottom, and a lower layer of a plunger material proximately above the lower layer of blasting substance; a higher layer of a plunger material at a relatively high level remote from said bottom, and spaced a predetermined distance above said lower layer of plunger material, and proximately above said higher layer of plunger material, a higher layer of a blasting substance; initiators placed in association with the respective layers of blasting substances and having connectors for connection to a controller for actuating the initiators at predetermined time intervals.
- the drill hole is charged in accordance with the first aspect of this invention.
- the spacing between opposing surfaces of respectively said lower layer and said higher layer of plunger material may be between about 0,5 m and about 3 m.
- the respective layers of plunger material may be flowable material allowing placement in the drill hole at the respective desired positions.
- the plunger material may be drill cuttings.
- Said relatively low level may be spatially adjacent a bottom of the drill hole and spaced above the bottom by a predetermined distance.
- the spacing may be between about 0,5 m and about 3 m, with the preferred range and value, and provisos mentioned above.
- the layer of plunger material and the layer of blasting substance may be supported on a plug positioned in the drill hole at a predetermined level.
- the charged drill hole may include plunger material provided below the lower layer of blasting substance to form a lower composite layer, plunger material provided above the higher layer of blasting substance to form a higher composite layer, and one or more further composite layers of blasting substance and plunger material, with spacings in- between, in series along the drill hole.
- the charged drill hole may include tamping material closing the drill hole proximate its mouth.
- a blasting operation including an array of blast holes each in accordance with the fourth aspect.
- the initiators may be connected to a common control.
- a charged drill hole in accordance with the invention is generally indicated by reference numeral 10.
- a drill hole extends along material, such as rock, to be blasted.
- the drill hole 1 2 has an open mouth 14 at a surface of the material to be blasted, and a blind end or blind bottom remote from the mouth and indicated by reference numeral 16.
- the drill hole is a vertical drill hole extending from the mouth 1 4 downwardly to the bottom.
- the charged drill hole 1 0 comprises a lower composite layer generally indicated by reference numeral 20.
- the position of the lower composite layer 20 is determined by means of a plug 22 which is lodged at a predetermined position in the drill hole 1 2.
- the plug 22 is a sacrificial plug and may be any plug suitable for this purpose.
- the lower composite layer 20, and more specifically the plug 22 is at a predetermined spacing, generally indicated by reference numeral 23, above the bottom 1 6. In this embodiment, the spacing 23 is about 1 ,5m.
- the lower composite layer 20 extends from the position of the plug 22 upwardly.
- a layer 24 of plunger material in the form of drill cuttings.
- the layer 24, including a portion of the layer 24 contained within the plug 22, is of the order of 1 50 mm length or thickness, in this embodiment. The reason for selecting the term "plunger material" for the layer 24 and its mechanism of operation, will be described herein below.
- a layer 26 of an explosive which, in this embodiment, is of the order of 9 m long.
- the plunger material 28 in this embodiment, is of the order of about 0,6m thick or long and it has an upper, free surface 28.1 .
- a higher composite layer generally indicated by reference numeral 30.
- the higher composite layer 30 is of generally similar construction and composition to the lower composite layer 20. Furthermore, the higher composite layer 30 is spaced at a predetermined spacing 33 above the upper free surface 28.1 in a manner similar to spacing of the lower composite layer 20 above the bottom 1 6. For convenience, similar reference numerals have been used for the respective layers or components and they are not again described.
- the length of the layer 36 of explosive, for the higher composite layer is of the order of about 6 m. The general arrangement may be repeated as many times as required, depending also on the depth of the drill hole. Generally, all of the composite layers have a more or less central charge of explosives flanked above and below by a layer of plunger material and each composite layer is based or supported on a plug 22, 23, or the like.
- a plug 42 supporting a layer of plunger material in the form of drill cuttings indicated by reference numeral 44 and having thereabove a charge of explosives 46.
- tamping material for example in the form of hard rock, drill cuttings, or the like is provided indicated by reference numeral 48, and which extends generally to the mouth 14.
- the initiators are electric or electronic and are controlled by means of a controller 57. In another embodiment or application, the initiators may be pyrotechnic.
- the Applicant does not wish to be bound by theory, but an explanation of the Applicant's hypothesis of the mechanism of operation when the explosives are actuated, is expected to assist a reader's understanding of the invention. Generally, the Applicant expects that it would wish the explosives to be actuated generally simultaneously, but this is not at this stage regarded as of particular importance, and further tests, also depending on various factors, may indicate that time lags may be advantageous.
- the general hypothesis is based on two aspects. First, it is believed that actuation of an explosive would propel the adjacent material, i.e. the plunger material, in the nature of a plunger away from the centre of actuation i.e.
- spacing would generally offer the route of least resistance. It is expected that at least the spacings remote from the bottom 1 6 would consist of air, whereas the spacing 23 adjacent the bottom may consist of air, or water in the case of wet holes, or partially water and partially air.
- the second aspect is that the plunger propelled by actuation of the explosive will necessarily impinge on an obstacle and will come to a sudden halt.
- the layer of plunger material 24 will impinge and come to a halt when it hits the bottom 1 6, and in the case of the plunger material 28 propelled upwardly when the layer of explosive 26 is actuated, and the plunger material 34 which will be propelled downwardly when the explosive 36 is actuated, they will impinge upon each other to cause the sudden halt.
- the carrier of the kinetic energy i.e. the mass proceeding at high speed
- the kinetic energy is again converted into energy associated with pressure or shock wave which causes very effective destruction of rock or other surrounding material, in accordance with preliminary tests conducted by the Applicant.
- an explosive substance 1 26 is positioned proximate the bottom 1 6 to be supported on the bottom 1 6.
- a layer 1 28 of a plunger material conveniently in the form of drill cuttings, and forming a free upper surface 1 28.1 .
- An initiator 1 27 is provided with the explosive substance 1 26 and is connected to a controller such as the controller 57.
- a controller such as the controller 57.
- spaced above the free upper surface 1 28.1 i.e. with an air space in between
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA2541340A CA2541340C (en) | 2003-10-03 | 2004-09-30 | Blasting |
AU2004278565A AU2004278565B2 (en) | 2003-10-03 | 2004-09-30 | Blasting |
US10/574,377 US20070272109A1 (en) | 2003-10-03 | 2004-09-30 | Blasting |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ZA2003/7748 | 2003-10-03 | ||
ZA200307748 | 2003-10-03 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2005033618A1 true WO2005033618A1 (en) | 2005-04-14 |
Family
ID=34423612
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/IB2004/003196 WO2005033618A1 (en) | 2003-10-03 | 2004-09-30 | Blasting |
Country Status (6)
Country | Link |
---|---|
US (1) | US20070272109A1 (en) |
AU (1) | AU2004278565B2 (en) |
CA (1) | CA2541340C (en) |
PE (1) | PE20050513A1 (en) |
WO (1) | WO2005033618A1 (en) |
ZA (1) | ZA200407780B (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102589372A (en) * | 2012-03-21 | 2012-07-18 | 西安建筑科技大学 | Chamber and deep hole blasting method of gob |
EP2476994A1 (en) | 2011-01-14 | 2012-07-18 | Anita Lohr | Explosion method and assembly of multiple boreholes for filling with explosives |
WO2022153314A1 (en) * | 2021-01-17 | 2022-07-21 | Tamar Israeli Advanced Quarrying Co. Ltd | A process for blasting |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
RU2740967C1 (en) * | 2020-08-31 | 2021-01-22 | Виктор Сергеевич Федотенко | Suspended well stem |
CN112611279A (en) * | 2020-12-18 | 2021-04-06 | 本钢板材股份有限公司 | Low-vibration high-quality blasting method |
RU2768270C1 (en) * | 2021-05-31 | 2022-03-23 | Виктор Сергеевич Федотенко | Suspended borehole stem |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1278908B (en) * | 1963-07-18 | 1968-09-26 | Rheinische Kalksteinwerke | Process for the damming of boreholes, which significantly supports the explosive effect |
US5035286A (en) * | 1988-03-10 | 1991-07-30 | Fitzgibbon Jr Daniel F | Methods and apparatus for field blasting of earth formations using inflatable devices for suspending explosives in boreholes |
US5497829A (en) * | 1993-11-17 | 1996-03-12 | Foam Concepts, Inc. | Expansion foam borehole plug and method |
WO2002042711A1 (en) * | 2000-11-21 | 2002-05-30 | International Technologies, Llc | Drillhole blasting |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4513665A (en) * | 1983-06-06 | 1985-04-30 | Occidental Oil Shale, Inc. | Method for loading explosive charges into blastholes formed in a subterranean formation |
CA1269321A (en) * | 1986-05-27 | 1990-05-22 | Specialised Polyurethane Applications Pty. Ltd. | Borehole plug and method |
US5099763A (en) * | 1990-05-16 | 1992-03-31 | Eti Explosive Technologies International | Method of blasting |
US5273110A (en) * | 1992-07-22 | 1993-12-28 | Fitzgibbon Jr Daniel F | Inflatable devices for suspending explosives and stemming materials in boreholes |
KR100316161B1 (en) * | 1999-09-16 | 2001-12-12 | 강대우 | Rock Blasting Method for using Air Tube |
US6631684B2 (en) * | 1999-09-16 | 2003-10-14 | Dae Woo Kang | Rock blasting method using air bladders embedded in loading layers |
-
2004
- 2004-09-27 ZA ZA2004/07780A patent/ZA200407780B/en unknown
- 2004-09-28 PE PE2004000944A patent/PE20050513A1/en active IP Right Grant
- 2004-09-30 AU AU2004278565A patent/AU2004278565B2/en not_active Ceased
- 2004-09-30 CA CA2541340A patent/CA2541340C/en not_active Expired - Fee Related
- 2004-09-30 US US10/574,377 patent/US20070272109A1/en not_active Abandoned
- 2004-09-30 WO PCT/IB2004/003196 patent/WO2005033618A1/en active Application Filing
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1278908B (en) * | 1963-07-18 | 1968-09-26 | Rheinische Kalksteinwerke | Process for the damming of boreholes, which significantly supports the explosive effect |
US5035286A (en) * | 1988-03-10 | 1991-07-30 | Fitzgibbon Jr Daniel F | Methods and apparatus for field blasting of earth formations using inflatable devices for suspending explosives in boreholes |
US5497829A (en) * | 1993-11-17 | 1996-03-12 | Foam Concepts, Inc. | Expansion foam borehole plug and method |
WO2002042711A1 (en) * | 2000-11-21 | 2002-05-30 | International Technologies, Llc | Drillhole blasting |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2476994A1 (en) | 2011-01-14 | 2012-07-18 | Anita Lohr | Explosion method and assembly of multiple boreholes for filling with explosives |
CN102589372A (en) * | 2012-03-21 | 2012-07-18 | 西安建筑科技大学 | Chamber and deep hole blasting method of gob |
CN102589372B (en) * | 2012-03-21 | 2013-12-04 | 西安建筑科技大学 | Chamber and deep hole blasting method of gob |
WO2022153314A1 (en) * | 2021-01-17 | 2022-07-21 | Tamar Israeli Advanced Quarrying Co. Ltd | A process for blasting |
Also Published As
Publication number | Publication date |
---|---|
ZA200407780B (en) | 2005-09-28 |
CA2541340A1 (en) | 2005-04-14 |
US20070272109A1 (en) | 2007-11-29 |
CA2541340C (en) | 2012-07-03 |
PE20050513A1 (en) | 2005-07-26 |
AU2004278565B2 (en) | 2009-01-22 |
AU2004278565A1 (en) | 2005-04-14 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
KR102517885B1 (en) | Blasting Method using Liner applied to Primer, Booster and Charge in a blasthole | |
US7743707B1 (en) | Fragmentation warhead with selectable radius of effects | |
WO2005052499A1 (en) | Method of blasting multiple layers or levels of rock | |
CN107003104B (en) | Delaying blasting method and explosion and delay tool between most short column inner hole | |
CA2541340C (en) | Blasting | |
US6845718B2 (en) | Projectile capable of propelling a penetrator therefrom and method of using same | |
IL114604A (en) | Multiple warhead projectile for destruction of deeply buried targets | |
US5223666A (en) | Apparatus for clearing mines | |
AU2002360867B2 (en) | Activated stemming device | |
CN105917069B (en) | Improved tool | |
EP0057308B1 (en) | Apparatus and method of blasting undersea rocks | |
US5261327A (en) | Blasting method and composition | |
US4711179A (en) | Arrangement in a mine which is capable of being neutralized | |
DE3408113C1 (en) | Warhead | |
EP1360455A1 (en) | Method of blasting | |
CN101900517A (en) | Anti-terrorist differential control method for exploding barriers | |
IL149428A (en) | Driver for power tools | |
CA1331111C (en) | Explosive device for underwater use | |
RU2572283C1 (en) | Method of destructing of space refuse fragments | |
US314585A (en) | Method of tamping bla | |
KR200275388Y1 (en) | Termite blasting apparatus | |
PL441921A1 (en) | Explosive reactive armor module | |
DE1453814C1 (en) | Electric igniter for explosive devices, especially ground mines | |
AU784143B2 (en) | Driver for power tools | |
RU2003134608A (en) | METHOD FOR PASSING RISKS FROM ROCK BREAKING WITH BOREHOLD CHARGES OF EXPLOSIVES |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AK | Designated states |
Kind code of ref document: A1 Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BW BY BZ CA CH CN CO CR CU CZ DE DK DM DZ EC EE EG ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NA NI NO NZ OM PG PH PL PT RO RU SC SD SE SG SK SL SY TJ TM TN TR TT TZ UA UG US UZ VC VN YU ZA ZM ZW |
|
AL | Designated countries for regional patents |
Kind code of ref document: A1 Designated state(s): BW GH GM KE LS MW MZ NA SD SL SZ TZ UG ZM ZW AM AZ BY KG KZ MD RU TJ TM AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LU MC NL PL PT RO SE SI SK TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
WWE | Wipo information: entry into national phase |
Ref document number: 2541340 Country of ref document: CA |
|
WWE | Wipo information: entry into national phase |
Ref document number: 10574377 Country of ref document: US |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2004278565 Country of ref document: AU |
|
DPEN | Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed from 20040101) | ||
ENP | Entry into the national phase |
Ref document number: 2004278565 Country of ref document: AU Date of ref document: 20040930 Kind code of ref document: A |
|
WWP | Wipo information: published in national office |
Ref document number: 2004278565 Country of ref document: AU |
|
122 | Ep: pct application non-entry in european phase | ||
WWP | Wipo information: published in national office |
Ref document number: 10574377 Country of ref document: US |