Ammunition and explosives – Blasting
Reexamination Certificate
2000-02-24
2001-10-09
Nelson, Peter A. (Department: 3641)
Ammunition and explosives
Blasting
C102S202700, C102S307000, C102S313000, C102S327000
Reexamination Certificate
active
06298785
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a blasting apparatus in which a thin metal wire (an example of a substance which fuses and vaporizes) is fused and vaporized rapidly by electrical energy supplied thereto for a short period of time, and a concrete structure, base rock, or plate-shaped to-be-blasted object is blasted by using the vaporization expansion force caused by the fusion and vaporization.
BACKGROUND ART
There has conventionally been a blasting apparatus for blasting a to-be-blasted object such as concrete or base rock by using discharge energy.
This blasting apparatus has a thin metal wire connecting electrodes to each other, a blasting substance (for example, water or oil is used) for transmitting pressure, which is filled in a blasting vessel and immerses the thin metal wire therein, and an energy supply circuit for supplying electrical energy to the thin metal wire via the electrodes.
The following is a description of a blasting method for blasting a to-be-blasted object such as base rock by using the blasting apparatus configured as described above.
First, a mounting hole is formed in the to-be-blasted object and a blasting vessel is mounted in this mounting hole. Next, electrical energy having been charged in a capacitor, which is a constituent element of the energy supply circuit, is discharged and supplied to the thin metal wire for a very short period of time. Thus, the thin metal wire is fused and vaporized rapidly so as to be expanded, and the expansion force of the thin metal wire is transmitted toward the outside by means of the blasting substance. The expansion force acts in the diametrical direction of the mounting hole, for example, against the wall surface of the mounting hole, thereby blasting the to-be-blasted object.
As described above, in the case where the to-be-blasted object is a base rock or the like, if the mounting hole is formed in the to-be-blasted object, and the blasting vessel is mounted in this mounting hole, the expansion force caused by the fusion and vaporization of the thin metal wire acts in the diametrical direction of the mounting hole, so that a sufficient impact force is given to the to-be-blasted object, and consequently the to-be-blasted object is blasted. In the case where the to-be-blasted object is a plate-shaped object, however, no mounting hole is formed in the to-be-blasted object, and the blasting vessel is merely caused to abut on the surface of the to-be-blasted object, so that almost all of the expansion force caused by the fusion and vaporization of the thin metal wire escapes into the air, and consequently a sufficient blasting force cannot be given to the to-be-blasted object.
Accordingly, an object of the present invention is to provide a blasting apparatus which solves the above problem.
DISCLOSURE OF THE INVENTION
The present invention provides a blasting apparatus comprising: a shock delivering member incorporated movably in a vessel and delivering a shock to a to-be-blasted object by colliding with the surface of the to-be-blasted object; an expansion force generating section provided in the vessel and being capable of producing an expansion force for causing the shock delivering member to collide with the surface of the to-be-blasted object; said expansion force generating section including a pair of electrodes inserted through a cover member installed removably to an opening formed in the vessel, a thin metal wire connected between the electrodes, a fluid blasting substance for transmitting to the shock delivering member an expansion force generated when the thin metal wire is fused and vaporized rapidly by electrical energy supplied to the thin metal wire via the electrodes for a short period of time, a filling port for filling the blasting substance into the vessel, and a discharge port for discharging the blasting substance having been used from the vessel; sealing means for sealing the filling port and the discharge port, respectively; and a pressing means for pressing the vessel toward the to-be-blasted object.
According to this configuration, the electrodes are inserted through the cover member and connected to each other by the thin metal wire, the cover member is installed to the vessel, the blasting substance is filled into the vessel through the filling port and the filling port is sealed by the sealing means, and electrical energy is supplied to the thin metal wire via the electrodes for a very short period of time. Thus, the thin metal wire is fused and vaporized, and an expansion force generated at this time is transmitted to the shock delivering member by means of the blasting substance. Therefore, owing to the expansion force, the shock delivering member is caused to abut strongly on the to-be-blasted object and delivers a shock to the to-be-blasted object, so that even a plate-shaped to-be-blasted object can be blasted reliably.
Also, the blasting apparatus is characterized in that a plurality of pairs of electrodes are inserted through the cover member, and the thin metal wire is connected between the respective pair of electrodes.
According to this configuration where a plurality of thin metal wires are provided, when each thin metal wire is fused and vaporized by electrical energy supplied thereto, the expansion force is increased as compared with the case where one thin metal wire is provided. Therefore, owing to this increased expansion force, the shock delivering member delivers a shock to the to-be-blasted object, so that the to-be-blasted object can be blasted reliably.
Also, the present invention provides a blasting apparatus comprising: a shock delivering member incorporated movably in a vessel and delivering a shock to a to-be-blasted object by colliding with the surface of the to-be-blasted object; an expansion force generating section provided in the vessel and being capable of producing an expansion force for causing the shock delivering member to collide with the surface of the to-be-blasted object; said expansion force generating section including electrodes inserted in a pair into the vessel, thin metal wires inserted in each of the electrodes so as to be capable of extruding to a gap between the electrodes, a fluid blasting substance for transmitting to the shock delivering member an expansion force generated when the thin metal wire is fused and vaporized rapidly by electrical energy supplied to the thin metal wire via the electrodes for a short period of time, a filling port for filling the blasting substance into the vessel, and a discharge port for discharging the blasting substance having been used from the vessel; sealing means for sealing the filling port and the discharge port, respectively; and a pressing means for pressing the vessel toward the to-be-blasted object.
According to this configuration, the thin metal wire is extruded to the gap between the electrodes in each blasting work, and electrical energy is supplied to the thin metal wire extruded to the gap between the electrodes. Thereby, the blasting work can be performed continuously, so that the working efficiency of the blasting work can be improved.
Also, the blasting apparatus is characterized in that a plurality of pairs of electrodes are inserted into the vessel, and the thin metal wire is inserted in each of the electrodes so as to be capable of extruding to the gap between the paired electrodes.
According to this configuration where a plurality of thin metal wires are provided, when each thin metal wire is fused and vaporized by electrical energy supplied thereto, the expansion force is increased as compared with the case where one thin metal wire is provided. Therefore, owing to this increased expansion force, the shock delivering member delivers a shock to the to-be-blasted object, so that the to-be-blasted object can be blasted reliably.
Further, the blasting apparatus is characterized in that an inclined or curved reflecting face is formed in the vessel to concentrate the expansion force on the shock delivering member.
According to this configuration, the expansion force generated
Arai Hiroaki
Inoue Tetsuya
Maehata Hidehiko
Tamakoshi Daisuke
Hitachi Zosen Corporation
Kusner Mark
Nelson Peter A.
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