Ammunition and explosives – Blasting – Terrain clearance
Reexamination Certificate
2001-07-09
2002-08-13
Nelson, Peter A. (Department: 3641)
Ammunition and explosives
Blasting
Terrain clearance
C102S275700, C102S275900
Reexamination Certificate
active
06431074
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a blasting apparatus, a blasting method and a retainer member used for blasting a to-be-blasted object such as a concrete structure or bedrock by supplying electric energy to a fine metal wire for a short time to cause the fine metal wire to rapidly melt and evaporate and then using an evaporation expansion force generated by said melting evaporation of the wire.
BACKGROUND ART
Dynamite has been known as blasting apparatus for blasting an object such as concrete or bedrock. However, dynamite is dangerous in view of its handling.
To eliminate such danger, there has recently been proposed a blasting apparatus and method allowing discharge energy to be used.
FIG. 32
shows the above-mentioned blasting apparatus
40
, comprising a blasting probe
43
loaded in a loading hole
42
formed in a to-be-blasted object
41
and an electric energy supply circuit
45
for supplying electric energy to a fine metal wire
44
composing this blasting probe
43
.
The above blasting proper
43
comprises a blasting vessel
46
inserted in the loading hole
42
in its depth direction and the above fine metal wire
44
connecting the tips of a pair of electrodes
47
and immersed into a blasting substance
48
filled in the blasting vessel
46
.
A blasting method for blasting a to-be-blasted object
41
by using the blasting apparatus
40
comprises: forming a loading hole
42
on the surface of the to-be-blasted object
41
; loading a blasting probe
43
in this loading hole
42
; connecting an electric energy supply circuit
45
to the electrodes
47
; and supplying to a fine metal wire
44
for a short time electric energy charged from a power supply device
49
and accumulated in a capacitor
51
via a charging control section
50
by way of discharging.
Then, the fine metal wire
44
rapidly melts and evaporates and evaporatively expands, causing a rapid expansion in volume of the blasting substance
48
, whereby the to-be-blasted object
41
is blasted or becomes fragile by the resultant expansion. force.
However, with the above blasting method using the above blasting apparatus
40
, since the loading hole
42
for loading the blasting vessel
46
needs be formed in a to-be-blasted object
41
, an excessive labor is required therefor. Such labor becomes especially heavy when many loading holes
42
must be formed in the to-be-blasted object
41
as shown in
FIG. 33
, which consequently requires a great amount of time for the work of blasting the object
41
.
Such being the case, as shown in
FIGS. 34 and 35
, it is considered to employ a blasting vessel
46
placed along the surface of a to-be-blasted object
41
without forming loading holes
42
. However, simply placing the blasting vessel
46
along the surface of the to-be-blasted object
41
caused dispersion of the expansion force (indicated by arrowheads in
FIG. 35
) generated when a fine metal wire
44
expands evaporatively and a blasting substance
48
expands in volume. In this result, the expansion force did not act on the object
41
effectively and could not surely blast the object
41
.
It is a purpose of the present invention to provide a blasting apparatus and method capable of solving the above problems and a retainer member used for the same blasting method.
DISCLOSURE OF THE INVENTION
This invention is a blasting apparatus for blasting a to-be-blasted object by supplying electric energy to a fine metal wire for a short time so as to rapidly melt and evaporate the fine metal wire, wherein the fine metal wire is retained in a recess formed on the surface of a retainer member and the recess is placed to oppose the surface of a blasting part of a to-be-blasted object at the time of blasting the to-be-blasted object.
Further, this invention is a blasting apparatus wherein the above recess is filled with a blasting substance which rapidly expands in volume following the melting evaporation of the fine metal wire.
According to the above arrangement, the fine metal wire is disposed in the recess formed on the surface of the retainer member and this recess is pressed against the surface of a to-be-blasted object, so that the preparatory work of forming loading holes in the to-be-blasted object becomes unnecessary and the blasting work can be easily accomplished in a short time.
Besides, this invention is a blasting method for blasting a to-be-blasted object by supplying electric energy to a fine metal wire for a short time so as to rapidly melt and evaporate the fine metal wire, wherein the fine metal wire is retained in a recess formed on the surface of a retainer member, and the recess is placed to oppose the surface of a blasting part of the to-be-blasted object, thereby blasting the object.
Further, this invention is a blasting method wherein the above recess is filled with a blasting substance which rapidly expands in volume following the melting evaporation of the fine metal wires.
Besides, this invention is a retainer member for a fine metal wire used in the blasting method for blasting a to-be-blasted object by supplying electric energy to the fine metal wire for a short time so as to rapidly melt and evaporate the fine metal wire, wherein a groove capable of guiding the fine metal wire is formed on the surface opposing the to-be-blasted object.
Also, this invention is a retainer member for a fine metal wire used in the blasting method for blasting a to-be-blasted object by supplying electric energy to the fine metal wire for a short time so as to rapidly melt and evaporate the fine metal wire, wherein a groove capable of guiding the fine metal wire is formed on the surface opposing the to-be-blasted object, and a recess capable of filling a liquid or semi-solid substance therein is formed on the same surface.
Besides, this invention is a blasting method for blasting a to-be-blasted object by supplying electric energy to a fine metal wire for a short time so as to rapidly melt and evaporate the fine metal wire, wherein the above fine metal wire is retained in a groove formed on the surface of a retainer member, and a liquid or semi-solid substance is supplied into a space between the surface of the retainer member and the surface of a blasting part of the to-be-blasted object at the time of blasting the object by placing the fine metal wire retained in the groove on the surface of the blasting part of the object.
Further, this invention is a blasting method wherein if a crack is present on the surface of the blasting part of the object, the crack is filled with a liquid.
Furthermore, if a crack is present on the surface of the blasting part of the object, the crack is filled with a liquid and then supplied with a semi-solid substance.
Besides, this invention is a blasting method comprising the steps of: fixing a fine metal wire to the press surface of a press member, said fine metal wire being melted and evaporated by supplying electric energy thereto for a short time; applying a blasting substance to the surface of a to-be-blasted object, said blasting substance rapidly expanding in volume according as the fine metal wire melts and evaporates; and supplying electric energy to the fine metal wire for a short time while the fine metal wire is pressed against the surface of the to-be-blasted object by means of the press member.
Further, this invention is a blasting method comprising the steps of: fixing a fine metal wire to the press surface of a press member, said fine metal wire being melted and evaporated by supplying electric energy thereto for a short time; applying a blasting substance to this press surface so as to immerse the fine metal wire therein, said blasting substance rapidly expanding in volume according as the fine metal wire melts and evaporates; and supplying electric energy to the a fine metal wire for a short time while the fine metal wire is pressed against the surface of the to-be-blasted object by means of the press member.
Furthermore, this invention is a blasting method comprising the steps of: pressing a blasting vessel against the surface of a to
Arai Hiroaki
Inoue Tetsuya
Kato Tsuyoshi
Maehata Hidehiko
Tamakoshi Daisuke
Hitachi Zosen Corporation
Hochberg D. Peter
Mellino Sean
Vieyra Katherine R.
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