EP0248610A1 - Verfahren und Werkzeug zur Gesteinszertrümmerung - Google Patents

Verfahren und Werkzeug zur Gesteinszertrümmerung Download PDF

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Publication number
EP0248610A1
EP0248610A1 EP87304794A EP87304794A EP0248610A1 EP 0248610 A1 EP0248610 A1 EP 0248610A1 EP 87304794 A EP87304794 A EP 87304794A EP 87304794 A EP87304794 A EP 87304794A EP 0248610 A1 EP0248610 A1 EP 0248610A1
Authority
EP
European Patent Office
Prior art keywords
barrel
hole
rock
mat
tool
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP87304794A
Other languages
English (en)
French (fr)
Inventor
Hermanus Quinton Westhuizen Van Der
Thomas Molteno Muller
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Boutade Worldwide Investments NV
Original Assignee
Boutade Worldwide Investments NV
SOUTHERN PROJECTS AND FINANCIA
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 Boutade Worldwide Investments NV, SOUTHERN PROJECTS AND FINANCIA filed Critical Boutade Worldwide Investments NV
Publication of EP0248610A1 publication Critical patent/EP0248610A1/de
Withdrawn legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21C—MINING OR QUARRYING
    • E21C37/00—Other methods or devices for dislodging with or without loading
    • E21C37/06—Other methods or devices for dislodging with or without loading by making use of hydraulic or pneumatic pressure in a borehole
    • E21C37/12—Other methods or devices for dislodging with or without loading by making use of hydraulic or pneumatic pressure in a borehole by injecting into the borehole a liquid, either initially at high pressure or subsequently subjected to high pressure, e.g. by pulses, by explosive cartridges acting on the liquid
    • 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
    • F42D5/05—Blasting mats

Definitions

  • This invention relates to a rock breaking method and tool.
  • rock breaking tool utilises a firing chamber to discharge a cartridge into the barrel.
  • the tool is used by inserting the barrel into a pre-drilled hole in the rock, the hole being filled with water prior to firing.
  • the expansion of gases from the firing causes water pressure in the form of a shock wave, which splits and cracks up the rock.
  • Rock breaking tools of this type known to the applicant have an extended barrel whch is located in the length of the pre-drilled hole, with the tip of the barrel having a radially expandable seal.
  • This seal expands by reason of lateral openings in the barrel directing discharge gases against the inner radial surface of the seal, and the expanding seal grips the surrounding rock to hold the tool within the hole sufficiently long for the discharge shock to break up the rocks. Without such a device for holding the tool within the hole, the tool is inclined to shoot out under blow back forces and the energy intended for breaking up the rock, is to a large extent lost.
  • the barrel of this type of tool also has lateral discharge outlets along its length to allow lateral impulsive discharge forces to operate on the rock surrounding the hole.
  • the tip itself apart from the lateral discharge outlets for expanding the seal, is closed off.
  • the above rock breaking tool and method of using it also requires that a fairly long hole be drilled to accommodate the length of the barrel and the lateral discharge outlet.
  • This hole must also be fairly accurately dimensioned and not be of too wide a diameter, since this can also serve to disperse and waste the energy shock.
  • the hole must also be relatively water-tight and the longer the hole that is drilled, the greater is the chance of a leakage.
  • a method of breaking up rock including drilling a hole in the rock, substantially filling the hole with water, and inserting a barrel of a rock breaking tool into the hole, the tool being operable to discharge a cartridge from a firing chamber down the barrel, and, discharging the cartridge down the barrel to cause an impulsive energy shock in the water to break up the rock, characterised in that the barrel used is short so as to be inserted in the entrance portion only of the hole, and a blast absorbing mat is located over the tool to retain it substantially in position in the hole during discharge.
  • the method involves the use of a rock breaking tool which has its barrel exterior tapered towards the discharge end and the barrel is secured in the hole with the hole periphery in contact around the firing chamber end of the barrel.
  • the mat may be provided with a central opening with reinforced periphery, and is placed to have the firing chamber end of the tool protruding through the mat hole, leaving the hole periphery resting on transverse handles provided on the tool.
  • a rock breaking tool comprising a firing chamber, a tubular barrel connected at one end to said firing chamber to enable the discharge of a cartridge in said firing chamber to pass through said barrel, into a water filled, pre-drilled hole in a rock to be broken up, a discharge outlet at the other end of the barrel, being substantially the only outlet from said barrel, the barrel length being only sufficient for it to be inserted part way into a water filled hole, in use.
  • the barrel exterior tapers down towards the discharge end by an amount arranged to facilitate insertion of the barrel in a hole drilled in rock by standard drill bit size, so as to leave the firing chamber end of the barrel in contact with the periphery of the hole in operative location.
  • a blast absorbing mat is locatable over the rock breaking tool in use and arranged to prevent the tool being blown back out of a hole during discharge of the tool.
  • the mat has a central opening, which has a reinforced periphery, adapted to be located over the rock breaking tool, and the rock breaking tool has transverse handles so that the tool protrudes partly through the hole and the mat rests on the handles, the reinforcing being adapted to prevent the periphery of the mat opening from expanding on discharge of the cartridge, and so allowing the tool to blow back through the central opening.
  • the mat reinforcing is wire, and the mat is woven of strip rubber-dash type vehicle tyre material, being approximately 2.3 m2 in area.
  • the mat may be square and measure l.5 m x l.5 m, and be approximately l5 mm thick.
  • a barrel (l) for a rock breaking tool is tubular, having an end (2) which is diametrically rebated and threaded at (3) in order to be screw fitted to a firing chamber (4).
  • the opposite discharge end (5) of the barrel carries the sole discharge outlet (6) of the barrel opening which runs axially through the barrel.
  • the barrel exterior is tapered down smoothly from the firing chamber end (2) to the discharge end (5).
  • the barrel operatively connected to a firing chamber to form a tool (7), is inserted in a pre-drilled rock hole (8), which is filled with water.
  • the hole (8) is drilled to a diameter which will allow the barrel (l) to close off the entrance (9) of the hole when the barrel is inserted, and preferably this closing off will occur when the barrel rests in the hole with the periphery of the hole entrance at the firing chamber end of the barrel. The majority of the length of the barrel should thus be inserted in the hole.
  • the taper of the barrel is arranged to allow easy but relatively close fitting insertion of the inserted barrel length in a hole having a diameter within tolerances to be expected from drilling with standard size drill bit.
  • an additional restraining means is provided, to prevent a tool fitted with the barrel from blowing back out of the hole on discharge.
  • a mat (l0) is shown which is of square configuration, having sides of approximately l.5 ⁇ l.5 metres in length.
  • the mat is of woven rubber tyre strip material, and of approximately l5 mm thickness. It has a central opening (ll) which is round and has wire reinforcing around it to restrict its expandability.
  • the mat In use, the mat is located over a rock breaking tool (l2), with the upper firing chamber portion (l3) of the tool protruding through the hole and the periphery of the hole resting on transverse handles (l4) of the tool. It has been found in practice that the mat serves to contain the blow back forces to good effect.
  • the extent of taper on the barrel will depend on the size of the tool and the hole which is to be drilled, and the dimensions and shape of the mat may vary widely. They may also be round, but this is not a convenient shape for folding and carrying.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Earth Drilling (AREA)
EP87304794A 1986-05-31 1987-05-29 Verfahren und Werkzeug zur Gesteinszertrümmerung Withdrawn EP0248610A1 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
ZA862724 1986-05-31
ZA862724 1986-05-31
ZA866991 1986-09-15
ZA866991 1986-09-15

Publications (1)

Publication Number Publication Date
EP0248610A1 true EP0248610A1 (de) 1987-12-09

Family

ID=27137005

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87304794A Withdrawn EP0248610A1 (de) 1986-05-31 1987-05-29 Verfahren und Werkzeug zur Gesteinszertrümmerung

Country Status (4)

Country Link
EP (1) EP0248610A1 (de)
AU (1) AU7361487A (de)
BR (1) BR8702782A (de)
ZW (1) ZW9887A1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997040256A1 (de) * 1996-04-19 1997-10-30 Klaus Spies Verfahren zum sprengen von festen massen
WO2008092282A1 (en) 2007-02-02 2008-08-07 Mattson Inter Tool Gmbh Rock-blasting cartridge and blasting method

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6339992B1 (en) * 1999-03-11 2002-01-22 Rocktek Limited Small charge blasting apparatus including device for sealing pressurized fluids in holes
US6321655B1 (en) 1999-03-11 2001-11-27 Rocktek Limited Method and apparatus for flyrock control in small charge blasting
US6347837B1 (en) 1999-03-11 2002-02-19 Becktek Limited Slide assembly having retractable gas-generator apparatus

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1408541A (en) * 1974-01-29 1975-10-01 Uk Otdel V G P Izyskatel Fluid-pressure blasting device for breaking rock concrete and reinforced concrete by pulsewise high liquid pressure
CA1019202A (en) * 1974-03-22 1977-10-18 Thomas A. Robertson Blasting mats
US4449754A (en) * 1980-11-24 1984-05-22 Vsesojuzny Proektno-Izyskatelsky I Nauchno-Issledovatelsky Institut "Gidropoekt" Imeni S.Ya. Zhuka Device for breaking monolithic structures by pulsewise liquid pressure

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1408541A (en) * 1974-01-29 1975-10-01 Uk Otdel V G P Izyskatel Fluid-pressure blasting device for breaking rock concrete and reinforced concrete by pulsewise high liquid pressure
CA1019202A (en) * 1974-03-22 1977-10-18 Thomas A. Robertson Blasting mats
US4449754A (en) * 1980-11-24 1984-05-22 Vsesojuzny Proektno-Izyskatelsky I Nauchno-Issledovatelsky Institut "Gidropoekt" Imeni S.Ya. Zhuka Device for breaking monolithic structures by pulsewise liquid pressure

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997040256A1 (de) * 1996-04-19 1997-10-30 Klaus Spies Verfahren zum sprengen von festen massen
WO2008092282A1 (en) 2007-02-02 2008-08-07 Mattson Inter Tool Gmbh Rock-blasting cartridge and blasting method

Also Published As

Publication number Publication date
BR8702782A (pt) 1988-03-01
AU7361487A (en) 1987-12-03
ZW9887A1 (en) 1987-09-02

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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Designated state(s): AT BE CH DE ES FR GB GR IT LI LU NL SE

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Owner name: BOUTADE WORLDWIDE INVESTMENTS NV

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Effective date: 19880608

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Effective date: 19890621

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18D Application deemed to be withdrawn

Effective date: 19901110

RIN1 Information on inventor provided before grant (corrected)

Inventor name: MULLER,THOMAS MOLTENO

Inventor name: WESTHUIZEN VAN DER,HERMANUS QUINTON