Mining or in situ disintegration of hard material – Expansible breaking-down devices – Fluid-pressed element
Patent
1998-01-23
2000-11-14
Lillis, Eileen Dunn
Mining or in situ disintegration of hard material
Expansible breaking-down devices
Fluid-pressed element
299 16, 299 20, E21C 3706, E21C 3710
Patent
active
061459348
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an electric discharge breaking method and system which are used for destruction of base rocks and breakage of rocks, and a method for manufacturing the discharge breaking system.
BACKGROUND ART
As a system for destroying an object to be ruptured, for example, a base rock, there is known a discharge breaking system which is shown in FIG. 22.
This discharge breaking system 101 is composed of a cylindrical container 103 which is made of synthetic resin, glass or the similar material and is to be filled with a breaking substance (referred to also as a substance for transmitting a pressure, for example, water 102), a pair of electrodes 104 which pass through a stopper 103a into the cylindrical container 103, a thin metal wire 105 which is disposed between these electrodes 104 and made of copper or aluminum, a capacitor 107 which is connected between these electrodes 104 through discharging electric wires 106, and a direct current power supply (power supply unit) 109 which is connected to the capacitor 107 through charging electric wires 108.
Needless to say, a discharging switch such as a thyristor is interposed in the course of the discharging electric wires 106 and a charging control circuit 111 comprising a charging switch is interposed in the course of the charging electric wires 108.
For carrying out shock fracture by electric discharge (hereinafter referred to as discharge breaking), an electrode fitting hole 122 is formed at a definite location of an object to be fractured, for example, a base rock 121, the cylindrical container 103 is fitted, together with the electrodes 104 and thin metal wire 105 disposed therein, into the electrode fitting hole 122 and the discharging switch 110 is turned on to flow, or discharge, electric energy charged in the capacitor 107 at a stroke to the thin metal wire 105, thereby fusing and vaporizing the thin metal wire 105. Then, water is also evaporated or vaporized in a moment and the base rock 121 is fractured by a breaking force generated by volumetric swelling, i.e., expansion force.
However, the discharge breaking system described above, in which the cylindrical container 103 filled with water 102 used as the breaking substance is fitted in the hole 122, may be incapable, in some cases, of sufficiently transmitting the expansion force and allows it to leak through an opening of the hole 122 since the cylindrical container 103 has a form which is not always coincident with that of the hole 122, or the hole 122 is usually formed larger than the cylindrical container 103, thereby forming a gap a.
Even when the expansion force does not leak through the opening between the cylindrical container 103 and the hole 122, this discharge breaking system poses a problem that the stopper 103a which has a weak sealing force is blown out, thereby allowing the generated expansion force to escape outside (to a side of the free surface).
Further, the thin metal wire 105 which is simply disposed between the pair of the electrodes 104 are ineffective for controlling an expansion force to be generated.
It is therefore a primary object to provide a discharge breaking method, a discharge breaking system and a manufacturing method for the discharge breaking system capable of sufficiently transmitting an expansion force (breaking force) and controlling this expansion force.
DISCLOSURE OF THE INVENTION
A first breaking method according to the present invention comprises a step to form a hole for charging a breaking substance in an object to be fractured, a step to insert a pair of electrodes having a thin metal wire connected between ends thereof into the hole, a step to dispose and subsequently seal the breaking substance and at least the thin metal wire in a container at a stage to destroy the object to be fractured by supplying electric energy charged in a capacitor to the electrodes for fusing and vaporizing the breaking substance, and a step to close an opening of the hole.
Further, a first discharge breaking system according to the
Arai Hiroaki
Daiku Hiroyuki
Inoue Tetsuya
Kato Tsuyoshi
Maehata Hidehiko
Hitachi Zosen Corporation
Hochberg D. Peter
Holt William H.
Lillis Eileen Dunn
Singh Suuil
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