EP0057308B1 - Apparatus and method of blasting undersea rocks - Google Patents

Apparatus and method of blasting undersea rocks Download PDF

Info

Publication number
EP0057308B1
EP0057308B1 EP81303580A EP81303580A EP0057308B1 EP 0057308 B1 EP0057308 B1 EP 0057308B1 EP 81303580 A EP81303580 A EP 81303580A EP 81303580 A EP81303580 A EP 81303580A EP 0057308 B1 EP0057308 B1 EP 0057308B1
Authority
EP
European Patent Office
Prior art keywords
blasting
rocks
shell
explosive
bottom plate
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.)
Expired
Application number
EP81303580A
Other languages
German (de)
French (fr)
Other versions
EP0057308A1 (en
Inventor
A-Chin 5Th Floor No.8 Alley 7 Lane 106 Wang
Original Assignee
Wang Shu-Jen
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 Wang Shu-Jen filed Critical Wang Shu-Jen
Priority to AT81303580T priority Critical patent/ATE13094T1/en
Publication of EP0057308A1 publication Critical patent/EP0057308A1/en
Application granted granted Critical
Publication of EP0057308B1 publication Critical patent/EP0057308B1/en
Expired legal-status Critical Current

Links

Images

Classifications

    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42D—BLASTING
    • F42D3/00—Particular applications of blasting techniques
    • F42D3/04—Particular applications of blasting techniques for rock blasting

Definitions

  • This invention relates to an apparatus and a method of blasting undersea rocks.
  • a container having a conically shaped chamber for explosive is used made of materials of high strength but having a comparatively weak bottom made, for example, of wooden board, plastics, paper board, or the like so that when the container filled with explosives and attached to the surface of the rocks to be blasted, the force of explosion is directed to the target to thereby achieve better results.
  • Such a method can shorten the operating time by 50% and save more than 40% of the costs.
  • the blasting pressure generated by such apparatus tends to disperse into the surrounding water and the impact upon the rocks is greatly reduced. This is because the conical shape of the container has a comparatively weak resistance strength against the force of explosion inside the container.
  • the present invention seeks to provide an apparatus and method of blasting undersea rocks in which the foregoing difficulties are substantially mitigated.
  • the apparatus comprises an apparatus for blasting undersea rocks comprising an explosion chamber in which the explosive is housed, the explosion chamber having a shell covered by a layer of reinforcing material of high strength and a substantially flat bottom plate sealed to the shell by securing means, characterized in that the shell has a semi-spherical shape.
  • a method of blasting rocks and particularly undersea rocks comprises placing the apparatus according to the invention with the flat bottom plate in contact with the rocks and detonating the apparatus to provide a high explosion effect.
  • the apparatus and method of the present invention have the effect of simultaneously controlling and delaying the pressure generated by the explosion inside the container due to the arcuate cross-section of the upper part of the explosive chamber which has a higher tensile strength than the conical shape of the known apparatus.
  • the present invention When in use the present invention is filled with explosive on land and the apparatus is then taken to the predetermined location to carry out the blasting where the apparatus is submerged into the water with the flat bottom plate in contact with the rock. Upon detonation the flat bottom plate is the first to rupture and a highly pressurised blasting force is provided to the rock which has the effect of enlarging the area of the explosion.
  • the present invention overcomes these disadvantages by providing an explosive chamber of material of high strength made by casting with the purpose that the pressure generated from an explosion inside the chamber can be instantaneously controlled and delayed so pressure is enhanced to become a concentrated impact force by the arcuate portion of the chamber guarding and concentrating the explosive force toward the rocks.
  • the explosive chamber of the present invention for housing the explosive is made of a single kind of material by casting in a uniform thickness and after being sealed with the bottom plate, it can constrain the blasting pressure of the detonated explosives for a moment to enhance the force of blasting.
  • an explosive chamber 1 is formed by a semi-spherical, uniform thickness, cast-steel shell 2 having a flat bottom plate 3 secured to the shell by circumferentially disposed bolts 4, and a reinforcing layer 5 of high specific gravity, such as concrete, moulded over the external surface of the semi-spherical shell 2 to increase the weight and stability of the apparatus.
  • a handle 6 is mounted on the top portion of the semi-spherical shell and a tube 7 is provided under the handle and through the concrete layer 5 and shell 2 into the explosion chamber 1 for installation of an electrical ignition wire (not shown) to the explosive (also not shown).
  • the explosive chamber 1 is filled with explosive and the bottom plate 3 secured in position by the bolts 4 on land.
  • the apparatus is then taken to the required site and positioned against the rock to be blasted with an electrical detonating wire protruding from the tube 7.
  • On detonating the explosive the force is initially delayed and controlled by the shell and layer 5 and the blast force is then concentrated by the semi-spherical shape of the shell to be directed by a bottom plate 3 against the rock.

Abstract

A method and apparatus for blasting undersea rocks uses a chamber (1) having a semi-spherical shape with a flat bottom plate (3), which in operation is placed against the surface of the rocks. The external surface of the semi-spherical container is moulded with a layer of concrete (5).

Description

  • This invention relates to an apparatus and a method of blasting undersea rocks.
  • It is known to blast undersea reef, rock or the like by drilling holes in to the rocks and then to fill the holes with explosives or alternatively by attaching explosives to the external surface of the rock. In the former method, the equipment required is very expensive but yet the efficiency of underwater operation is very low. Furthermore, during the operation of blasting, the whole area surrounding the working site must be cordoned off and blocked for a long time and this results in traffic problems and an increase of administrative expenses, and therefore the total cost of project engineering is usually over five times the cost of blasting on land. In the latter method, despite the advantage that the operating time is slightly shorter than the former method, it requires more explosive and can only blast relatively soft rocks. It is less effective in blasting hard reef, rock or silt stone of toughness over N70.
  • To overcome the above disadvantages of longer working time, high operation costs and inability to blast hard rocks, the present inventor devised a very effective and improved method capable of blasting hard, and tough underwater rocks in a much shorter period of time which is disclosed in Chinese Patent No: 6280. In the prior method, a container having a conically shaped chamber for explosive is used made of materials of high strength but having a comparatively weak bottom made, for example, of wooden board, plastics, paper board, or the like so that when the container filled with explosives and attached to the surface of the rocks to be blasted, the force of explosion is directed to the target to thereby achieve better results. Such a method can shorten the operating time by 50% and save more than 40% of the costs. However, it has been found that the blasting pressure generated by such apparatus tends to disperse into the surrounding water and the impact upon the rocks is greatly reduced. This is because the conical shape of the container has a comparatively weak resistance strength against the force of explosion inside the container.
  • The present invention seeks to provide an apparatus and method of blasting undersea rocks in which the foregoing difficulties are substantially mitigated.
  • According to this invention the apparatus comprises an apparatus for blasting undersea rocks comprising an explosion chamber in which the explosive is housed, the explosion chamber having a shell covered by a layer of reinforcing material of high strength and a substantially flat bottom plate sealed to the shell by securing means, characterized in that the shell has a semi-spherical shape.
  • According to a further aspect of this invention a method of blasting rocks and particularly undersea rocks comprises placing the apparatus according to the invention with the flat bottom plate in contact with the rocks and detonating the apparatus to provide a high explosion effect.
  • The apparatus and method of the present invention have the effect of simultaneously controlling and delaying the pressure generated by the explosion inside the container due to the arcuate cross-section of the upper part of the explosive chamber which has a higher tensile strength than the conical shape of the known apparatus.
  • When in use the present invention is filled with explosive on land and the apparatus is then taken to the predetermined location to carry out the blasting where the apparatus is submerged into the water with the flat bottom plate in contact with the rock. Upon detonation the flat bottom plate is the first to rupture and a highly pressurised blasting force is provided to the rock which has the effect of enlarging the area of the explosion.
  • In distinction to the conventional undersea blasting method where it is necessary to drill holes in the underwater rock and then fill the holes with explosives the blasting operation can be carried out with less equipment and more quickly with the present invention. Furthermore, in the conventional method of attaching explosives to the rock surface, the blasting pressure generated tends to disburse into the surrounding water which has a density much less than that of the rock, and the impact force against the rock dissipates almost entirely. Therefore, such a known method has very little efficiency in blasting hard and tough rocks. The present invention overcomes these disadvantages by providing an explosive chamber of material of high strength made by casting with the purpose that the pressure generated from an explosion inside the chamber can be instantaneously controlled and delayed so pressure is enhanced to become a concentrated impact force by the arcuate portion of the chamber guarding and concentrating the explosive force toward the rocks.
  • The explosive chamber of the present invention for housing the explosive is made of a single kind of material by casting in a uniform thickness and after being sealed with the bottom plate, it can constrain the blasting pressure of the detonated explosives for a moment to enhance the force of blasting.
  • The apparatus of the present invention will now be described by way of example with reference to the accompanying drawings in which,
    • Figure 1 is a vertical cross-section of the blasting apparatus of the present invention, and
    • Figure 2 is a bottom view of the apparatus with the bottom plate removed.
  • Referring to the figures, an explosive chamber 1 is formed by a semi-spherical, uniform thickness, cast-steel shell 2 having a flat bottom plate 3 secured to the shell by circumferentially disposed bolts 4, and a reinforcing layer 5 of high specific gravity, such as concrete, moulded over the external surface of the semi-spherical shell 2 to increase the weight and stability of the apparatus. A handle 6 is mounted on the top portion of the semi-spherical shell and a tube 7 is provided under the handle and through the concrete layer 5 and shell 2 into the explosion chamber 1 for installation of an electrical ignition wire (not shown) to the explosive (also not shown).
  • In operation the explosive chamber 1 is filled with explosive and the bottom plate 3 secured in position by the bolts 4 on land. The apparatus is then taken to the required site and positioned against the rock to be blasted with an electrical detonating wire protruding from the tube 7. On detonating the explosive the force is initially delayed and controlled by the shell and layer 5 and the blast force is then concentrated by the semi-spherical shape of the shell to be directed by a bottom plate 3 against the rock.

Claims (5)

1. An apparatus for blasting undersea rocks comprising an explosion chamber in which the explosive is housed, the explosion chamber (1) having a shell (2) covered by a layer (5) of reinforcing material of high strength and a substantially flat bottom plate (3) sealed to the shell (2) by securing means (4), characterized in that the shell (2) has a semi-spherical shape.
2. An apparatus as claimed in claim 1, wherein the material of the shell (2) is steel.
3. An apparatus as claimed in any preceding claim, wherein the layer (5) of reinforcing material is made of concrete.
4. An apparatus as claimed in any preceding claim, characterized in that the bottom plate (3) is made of the same material as that of the shell (2).
5. A method of blasting undersea rocks comprising placing an apparatus having an explosive chamber containing explosive material and formed partially by a flat bottom plate (3) which is to be placed against the rock to be blasted and detonating the explosive material, characterized in that the apparatus is in accordance with any of the preceding claims.
EP81303580A 1981-01-29 1981-08-05 Apparatus and method of blasting undersea rocks Expired EP0057308B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81303580T ATE13094T1 (en) 1981-01-29 1981-08-05 DEVICE AND METHOD FOR BLASTING UNDERWATER ROCK.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US23008781A 1981-01-29 1981-01-29
US230087 1981-01-29

Publications (2)

Publication Number Publication Date
EP0057308A1 EP0057308A1 (en) 1982-08-11
EP0057308B1 true EP0057308B1 (en) 1985-05-02

Family

ID=22863907

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81303580A Expired EP0057308B1 (en) 1981-01-29 1981-08-05 Apparatus and method of blasting undersea rocks

Country Status (3)

Country Link
EP (1) EP0057308B1 (en)
AT (1) ATE13094T1 (en)
DE (1) DE3170281D1 (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2134630B (en) * 1983-01-10 1986-10-15 Wang Su Jen Apparatus and method of blasting rocks
GB8519111D0 (en) * 1985-07-29 1985-09-04 Vetco Uk Ltd C E Severing wellhead
FR2777648B1 (en) * 1996-09-05 2001-11-16 France Etat DEVICE FOR NEUTRALIZING EXPLOSIVE DEVICES
GB2367608B (en) * 2000-10-03 2004-10-06 Secr Defence A method for suppressing shock waves in a liquid medium
CN106969677B (en) * 2017-05-04 2018-03-16 中水东北勘测设计研究有限责任公司 The lower chock blasting method of the thick alluvial covering of deep water based on amendment blasting action index
CN108548462A (en) * 2018-06-19 2018-09-18 贵州大学 A kind of engineering explosion explosive fixing device
CN114199080A (en) * 2021-11-30 2022-03-18 国能包头能源有限责任公司 Carbon dioxide blasting device for blasting massive rock mass

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1738920A (en) * 1927-07-05 1929-12-10 Central Mine Equipment Company Blasting cartridge
US2247169A (en) * 1937-12-11 1941-06-24 Heitzman Safety Blasting Plug Blasting shell for surface blasting
CH293438A (en) * 1951-02-06 1953-09-30 Rochat Jean Explosive device with a directed explosive effect.
US3373686A (en) * 1965-03-01 1968-03-19 Lockheed Aircraft Corp Explosive actuator
US3374737A (en) * 1967-02-15 1968-03-26 Earl A. Pike Detonating tape
US4090447A (en) * 1975-02-26 1978-05-23 Johnsen Oscar A Directional blasting tubes and method of use

Also Published As

Publication number Publication date
DE3170281D1 (en) 1985-06-05
EP0057308A1 (en) 1982-08-11
ATE13094T1 (en) 1985-05-15

Similar Documents

Publication Publication Date Title
US3117518A (en) Apparatus for cutting encased explosives
EP0057308B1 (en) Apparatus and method of blasting undersea rocks
CA2043926C (en) Adhesive secondary blasting cone
CA1201085A (en) Anode element for use in a cathodic protection system
US5223666A (en) Apparatus for clearing mines
US3091177A (en) Method for loading a bore hole
US6405628B1 (en) Method and apparatus for penetrating hard materials
CA1094388A (en) Shaped explosive charge device for underwater use
US3154042A (en) Embedment anchor
GB2134630A (en) Apparatus and method of blasting rocks
JPS59161516A (en) Fixing of anchor for sheet pile wall in rock layer
KR101982610B1 (en) Underwater bedrock blasting method and device and explosives used therefor
US3613582A (en) Hollow charge having a directed explosive effect
US3759182A (en) Hollow charge having a directed explosive effect
KR20000036258A (en) Blasting a method of underwater base rock
GB2133440A (en) Method of driving steel profiles into a rock substratum
CA2541340C (en) Blasting
KR102054098B1 (en) Underwater bedrock blasting method and device and explosives used therefor
JP2665805B2 (en) Ground improvement method
CN209961091U (en) Carbon dioxide causes burst pipe and releases and explodes improvement equipment
CN110132066B (en) Explosion releasing method of improved device for releasing explosion by utilizing carbon dioxide fracturing pipe
US6032567A (en) Surf zone mine clearance
US3024727A (en) Area detonation
KR102520570B1 (en) vibration reduction type blasting a method of underwater base rock
AU661834B2 (en) Improvements in or relating to shaped charges

Legal Events

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

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

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

17P Request for examination filed

Effective date: 19830103

ITF It: translation for a ep patent filed

Owner name: ING. C. GREGORJ S.P.A.

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

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

REF Corresponds to:

Ref document number: 13094

Country of ref document: AT

Date of ref document: 19850515

Kind code of ref document: T

REF Corresponds to:

Ref document number: 3170281

Country of ref document: DE

Date of ref document: 19850605

ET Fr: translation filed
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19850831

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: AT

Payment date: 19860812

Year of fee payment: 6

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 19870831

Year of fee payment: 7

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19880805

Ref country code: AT

Effective date: 19880805

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Effective date: 19880806

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Effective date: 19880831

Ref country code: CH

Effective date: 19880831

Ref country code: BE

Effective date: 19880831

BERE Be: lapsed

Owner name: WANG SHU-JEN

Effective date: 19880831

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Effective date: 19890301

NLV4 Nl: lapsed or anulled due to non-payment of the annual fee
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19890428

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19890503

GBPC Gb: european patent ceased through non-payment of renewal fee
REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

EUG Se: european patent has lapsed

Ref document number: 81303580.5

Effective date: 19890510