JP3888736B2

JP3888736B2 - Destruction method

Info

Publication number: JP3888736B2
Application number: JP13564097A
Authority: JP
Inventors: 慶三風間; 光雅小笠原; 博明渡辺; 浩成荒井; 英彦前畑; 大介玉越; 剛加藤
Original assignee: Obayashi Corp; Hitachi Zosen Corp
Current assignee: Obayashi Corp; Hitachi Zosen Corp
Priority date: 1997-05-27
Filing date: 1997-05-27
Publication date: 2007-03-07
Anticipated expiration: 2017-05-27
Also published as: JPH10323826A

Description

【０００１】
【発明の属する技術分野】
本発明は、電気エネルギーを用いてコンクリート構造物や岩盤などの被破壊物を破壊する破壊方法に関する。
【０００２】
【従来の技術】
従来、電気エネルギーを用いてコンクリート構造物や岩盤などの被破壊物を破壊する破壊方法は、金属細線を介して接続した一対の電極をコンデンサに接続し、作業者の経験によって、被破壊物に装着孔を所定間隔ごとに、あるいは自由面から所定距離ごとに穿ち、これら装着孔に水や油などの破壊用物質を注入するとともに装着孔に電極を装着し、コンデンサに充電蓄積した電気エネルギーを短時間で金属細線に放電供給して金属細線を急激に溶融蒸発させることにより破壊用物質を急激に気化させ、その際の膨張力で被破壊物を破壊したり脆弱化させたりするものである。
【０００３】
【発明が解決しようとする課題】
上記のように、被破壊物に形成する装着孔の間隔は経験によって決められるので、コンデンサに蓄積する電気エネルギー、すなわち充電電圧の大きさによっては、装着孔間に生じる破壊面（亀裂）同士が繋がらず、破壊が不十分であったり、逆に充電電圧の大きさに比べて装着孔同士の間隔が狭いと、破壊は十分に行われるものの、不経済であるといった課題がある。
【０００４】
そこで本発明は、上記課題を解決し得る破壊装置の提供を目的とする。
【０００５】
【課題を解決するための手段】
本発明における課題を解決するための請求項１記載の手段は、異なる二方向の自由面を有する被破壊物の各自由面に、膨張によって被破壊物を破壊する破壊用物質を充填するための破壊用孔を、その延長が交差するよう垂直に形成し、これら各破壊用孔に、電極間を接続した金属細線を、破壊用孔の深さ方向に沿って配置して破壊用物質に浸漬させ、充電されたコンデンサーから電極を介して金属細線に電気エネルギーを短時間で供給して金属細線を急激に溶融蒸発させることにより破壊用物質を気化させ、その際の膨張力で金属細線から所定の破壊可能領域分だけ被破壊物を破壊するようにし、各破壊用孔に金属細線を設置する際に、一方の自由面からその破壊用孔に配置する金属細線の基端部までの距離Ｚ_oおよびその金属細線の基端部から一方の自由面側の破壊可能領域限界までの距離Ｒｄとの関係が、下記（ａ）式Ｚ_o≦Ｒｄ（ａ）を満足するよう設定し、他方の自由面からその破壊用孔に配置する金属細線の基端部までの距離Ｚ_o’およびその金属細線の基端部から他方の自由面側の破壊可能領域限界までの距離Ｒｄ’との関係が、下記（ｂ）式Ｚ_o’≦Ｒｄ’ （ｂ）を満足するよう設定した破壊方法であって、各金属細線の先端部間の距離Ａ、前記距離Ｒｄおよび距離Ｒｄ’の関係が、下記（ｃ）式Ａ≦Ｒｄ＋Ｒｄ’ （ｃ）を満足するよう設定し、前記（ａ）式〜（ｃ）式における金属細線の基端部から破壊可能領域限界までの距離ＲｄおよびＲｄ ' は、電気エネルギーＷ（Ｊ）、エネルギー・破壊可能領域変換係数ｋとすると、下記（ｉ）式Ｒｄ≦（√Ｗ）／ｋ（ｉ）および（ｉ ' ）式Ｒｄ ' ≦（√Ｗ）／ｋ（ｉ ' ）をそれぞれ満足するよう設定し、電気エネルギーＷは、電気エネルギーを溜めるコンデンサー容量Ｃ（Ｆ）、充電電圧Ｖ（Ｖ）とすると、下記（ｊ）式Ｗ＝（Ｃ×Ｖ ^２）／２（ｊ）を満足するよう設定している。
【０００６】
請求項２記載の手段は、異なる二方向の自由面を有する被破壊物の各自由面に、膨張によって被破壊物を破壊する破壊用物質を充填するための破壊用孔を、その延長が交差するよう垂直に形成し、これら各破壊用孔に、電極間を接続した金属細線を、破壊用孔の深さ方向に沿ってかつ所定間隔置きに複数個配置して破壊用物質に浸漬させ、充電されたコンデンサーから電極を介して金属細線に電気エネルギーを短時間で供給して金属細線を急激に溶融蒸発させることにより破壊用物質を気化させ、その際の膨張力で金属細線から所定の破壊可能領域分だけ被破壊物を破壊するようにし、各破壊用孔に金属細線を設置する際に、一方の自由面とその自由面から最も近い金属細線の基端部までの距離Ｚ_oおよびその金属細線の基端部から一方の自由面側の破壊可能領域限界までの距離Ｒｄの関係が、下記（ａ）式Ｚ_o≦Ｒｄ（ａ）を満足するよう設定し、他方の自由面とその自由面から最も近い金属細線の基端部までの距離Ｚ_o’およびその金属細線の基端部から他方の自由面側の破壊可能領域限界までの距離Ｒｄ’との関係が、下記（ｂ）式Ｚ_o’≦Ｒｄ’ （ｂ）を満足するよう設定した破壊方法であって、各自由面から最も離れた金属細線同士の先端部間の距離Ａ、前記距離Ｒｄおよび距離Ｒｄ’の関係が、下記（ｃ）式Ａ≦Ｒｄ＋Ｒｄ’ （ｃ）を満足するよう設定し、一方の自由面とその自由面から最も遠い金属細線の基端部までの距離Ｚ、前記距離Ｒｄ、一方の自由面のひとつの破壊用孔に挿入する金属細線の個数Ｎおよび各金属細線長さＬｐの関係が、下記（ｄ）式Ｚ≦Ｒｄ（２・Ｎ−１）＋Ｎ・Ｌｐ（ｄ）を満足するよう設定し、他方の自由面とその自由面から最も遠い金属細線の基端部までの距離Ｚ’、前記距離Ｒｄ’、他方の自由面のひとつの破壊用孔に挿入する金属細線の個数Ｍおよび各金属細線長さＬｄ’の関係が、下記（ｅ）式Ｚ’≦Ｒｄ’（２・Ｍ−１）＋Ｍ・Ｌｐ’ （ｅ）を満足するよう設定し、他方の自由面から一方の自由面に形成する破壊用孔までの距離Ｙ、前記距離Ｒｄ，Ｒｄ’、金属細線の個数Ｍおよび金属細線長さＬｐ’の関係が下記（ｆ）式Ｙ≦Ｍ（２・Ｒｄ’＋Ｌｐ’）＋Ｒｄ（ｆ）を満足するよう設定し、一方の自由面から他方の自由面に形成する破壊用孔までの距離Ｙ’、前記距離Ｒｄ，Ｒｄ’、金属細線の個数Ｍおよび金属細線長さＬｐの関係が下記（ｇ）式Ｙ’≦Ｎ（２・Ｒｄ＋Ｌｐ）＋Ｒｄ’ （ｇ）を満足するよう設定し、前記（ａ）式〜（ｇ）式における金属細線の基端部から破壊可能領域限界までの距離ＲｄおよびＲｄ ' は、電気エネルギーＷ（Ｊ）、エネルギー・破壊可能領域変換係数ｋとすると、下記（ｉ）式Ｒｄ≦（√Ｗ）／ｋ（ｉ）および（ｉ ' ）式Ｒｄ ' ≦（√Ｗ）／ｋ（ｉ ' ）をそれぞれ満足するよう設定し、電気エネルギーＷは、電気エネルギーを溜めるコンデンサー容量Ｃ（Ｆ）、充電電圧Ｖ（Ｖ）とすると、下記（ｊ）式Ｗ＝（Ｃ×Ｖ ^２）／２（ｊ）を満足するよう設定している。
【０００７】
請求項３記載の手段は、破壊用孔を、各自由面に沿って複数個並べている。
請求項４記載の手段は、異なる二方向の自由面を有する被破壊物の各自由面に、膨張によって被破壊物を破壊する破壊用物質を充填するための破壊用孔を垂直に、かつその延長がずれるように形成し、これら各破壊用孔に、電極間を接続した金属細線を、破壊用孔の深さ方向に沿って配置して破壊用物質に浸漬させ、充電されたコンデンサーから電極を介して金属細線に電気エネルギーを短時間で供給して金属細線を急激に溶融蒸発させることにより破壊用物質を気化させ、その際の膨張力で金属細線から所定の破壊可能領域分だけ被破壊物を破壊するようにし、各破壊用孔に金属細線を設置する際に、一方の自由面からその破壊用孔に配置する金属細線の基端部までの距離Ｚ_oおよびその金属細線の基端部から一方の自由面側の破壊可能領域限界までの距離Ｒｄとの関係が、下記（ａ）式Ｚ_o≦Ｒｄ（ａ）を満足するよう設定し、他方の自由面からその破壊用孔に配置する金属細線の基端部までの距離Ｚ_o’およびその金属細線の基端部から他方の自由面側の破壊可能領域限界までの距離Ｒｄ’との関係が、下記（ｂ）式Ｚ_o’≦Ｒｄ’ （ｂ）を満足するよう設定した破壊方法であって、各金属細線の先端部間の距離Ａ、前記距離Ｒｄおよび距離Ｒｄ’の関係が、下記（ｃ）式Ａ≦Ｒｄ＋Ｒｄ’ （ｃ）を満足するよう設定するとともに、各金属細線の先端部間のずれの距離Ｄ、前記距離Ｒｄおよび距離Ｒｄ’の関係が、下記（ｈ）式Ｄ≦Ｒｄ＋Ｒｄ’ （ｈ）を満足するよう設定し、前記（ａ）式〜（ｃ），（ｈ）式における金属細線の基端部から破壊可能領域限界までの距離ＲｄおよびＲｄ ' は、電気エネルギーＷ（Ｊ）、エネルギー・破壊可能領域変換係数ｋとすると、下記（ｉ）式Ｒｄ≦（√Ｗ）／ｋ（ｉ）および（ｉ ' ）式Ｒｄ ' ≦（√Ｗ）／ｋ（ｉ ' ）をそれぞれ満足するよう設定し、電気エネルギーＷは、電気エネルギーを溜めるコンデンサー容量Ｃ（Ｆ）、充電電圧Ｖ（Ｖ）とすると、下記（ｊ）式Ｗ＝（Ｃ×Ｖ ^２）／２（ｊ）を満足するよう設定している。
【０００８】
請求項５記載の手段は、異なる二方向の自由面を有する被破壊物の各自由面に、膨張によって被破壊物を破壊する破壊用物質を充填するための破壊用孔を垂直に、かつその延長がずれるように形成し、これら各破壊用孔に、電極間を接続した金属細線を、破壊用孔の深さ方向に沿ってかつ所定間隔置きに複数個配置して破壊用物質に浸漬させ、充電されたコンデンサーから電極を介して金属細線に電気エネルギーを短時間で供給して金属細線を急激に溶融蒸発させることにより破壊用物質を気化させ、その際の膨張力で金属細線から所定の破壊可能領域分だけ被破壊物を破壊するようにし、各破壊用孔に金属細線を設置する際に、一方の自由面とその自由面に最も近い金属細線の基端部までの距離Ｚ_oおよびその金属細線の基端部から一方の自由面側の破壊可能領域限界までの距離Ｒｄの関係が、下記（ａ）式Ｚ_o≦Ｒｄ（ａ）を満足するよう設定し、他方の自由面とその自由面から最も近い金属細線の基端部までの距離Ｚ_o’およびその金属細線の基端部から他方の自由面側の破壊可能領域限界までの距離Ｒｄ’との関係が、下記（ｂ）式Ｚ_o’≦Ｒｄ’ （ｂ）を満足するよう設定した破壊方法であって、各金属細線の先端部間の距離Ａ、前記距離Ｒｄおよび距離Ｒｄ’の関係が、下記（ｃ）式Ａ≦Ｒｄ＋Ｒｄ’ （ｃ）を満足するよう設定し、一方の自由面とその自由面から最も遠い金属細線の先端部までの距離Ｚ、前記距離Ｒｄ、一方の自由面のひとつの破壊用孔に挿入する金属細線の個数Ｎおよび各金属細線長さＬｐの関係が、下記（ｄ）式Ｚ≦Ｒｄ（２・Ｎ−１）＋Ｎ・Ｌｐ（ｄ）を満足するよう設定し、他方の自由面とその自由面から最も遠い金属細線の先端部までの距離Ｚ’、前記距離Ｒｄ’、他方の自由面のひとつの破壊用孔に挿入する金属細線の個数Ｍおよび各金属細線長さＬｐ’の関係が、下記（ｅ）式Ｚ’≦Ｒｄ’（２・Ｍ−１）＋Ｍ・Ｌｐ’ （ｅ）を満足するよう設定し、他方の自由面から一方の自由面に形成する破壊用孔までの距離Ｙ、前記距離Ｒｄ，Ｒｄ’、金属細線の個数Ｍおよび金属細線長さＬｐ’の関係が下記（ｆ）式Ｙ≦Ｍ（２・Ｒｄ’＋Ｌｐ’）＋Ｒｄ（ｆ）を満足するよう設定し、一方の自由面から他方の自由面に形成する破壊用孔までの距離Ｙ’、前記距離Ｒｄ，Ｒｄ’、金属細線の個数Ｍおよび金属細線長さＬｐの関係が下記（ｇ）式Ｙ’≦Ｎ（２・Ｒｄ＋Ｌｐ）＋Ｒｄ’ （ｇ）を満足するよう設定し、各金属細線の先端部間のずれの距離Ｄ、前記距離Ｒｄおよび距離Ｒｄ’の関係が、下記（ｈ）式Ｄ≦Ｒｄ＋Ｒｄ’ （ｈ）を満足するよう設定し、前記（ａ）式〜（ｈ）式における金属細線の基端部から破壊可能領域限界までの距離ＲｄおよびＲｄ ' は、電気エネルギーＷ（Ｊ）、エネルギー・破壊可能領域変換係数ｋとすると、下記（ｉ）式Ｒｄ≦（√Ｗ）／ｋ（ｉ）および（ｉ ' ）式Ｒｄ ' ≦（√Ｗ）／ｋ（ｉ ' ）をそれぞれ満足するよう設定し、電気エネルギーＷは、電気エネルギーを溜めるコンデンサー容量Ｃ（Ｆ）、充電電圧Ｖ（Ｖ）とすると、下記（ｊ）式Ｗ＝（Ｃ×Ｖ ^２）／２（ｊ）を満足するよう設定している。
【０００９】
そして、破壊用孔を、各自由面に沿って複数個並べている。
【００１０】
【発明の実施の形態】
以下、図面に基づいて本発明の実施の形態を説明する。
まず、図１〜図１０に基づいて本発明の実施の第一形態に係る破壊方法を説明する。はじめに、本発明の実施の第一形態に係る破壊方法を実施するための破壊装置１の構成を説明する。
【００１１】
この破壊装置１は、図３に示すように、対で設けた電極２の先端部同士が、被破壊物３に形成した破壊用孔４の深さ方向に沿った金属細線（例えばＣｕが用いられる）５で接続され、この金属細線５は、膨張によって被破壊物３を破壊するための破壊用物質（例えばゼリー状の物質が用いられる）１３を充填した破壊容器１３Ａに装着される。このように、破壊容器１３Ａに破壊用物質１３を充填し、金属細線５および電極２を挿入したものを破壊プローブＰとする。
【００１２】
同図に示すように、この破壊プローブＰの電極２を介して金属細線５に、これを溶融蒸発させるに十分な電気エネルギーを供給するための電気エネルギー供給回路６が接続され、この電気エネルギー供給回路６は、各電極２の端子２ａに接続された電源装置（直流電源が用いられる）７と、この電源装置７と一方の端子２ａとの間に直列接続されて、電源装置７と両端子２ａとの間に並列接続されたコンデンサー８に対し所定量の電気容量を蓄積するよう制御するための充電制御回路１０と、この充電制御回路１０と一方の端子２ａとの間に接続された放電スイッチ１１とから構成されている。
【００１３】
次に、１個の金属細線５（破壊装置１）の破壊可能領域Ｍｆを、図１、図２および図４に基づいて説明する。図において、仮想線で示した範囲が破壊可能領域Ｍｆであり、矢印は衝撃力の伝播方向を示している。この破壊可能領域（容積）Ｍｆは、次式で表される。
【００１４】
Ｍｆ＝π・Ｒｄ²・（４／３・Ｒｄ＋Ｌｐ）
ここで、Ｒｄ：破壊可能領域限界（衝撃力伝播距離）、Ｌｐ：金属細線５の長さである。
【００１５】
次に、実施の第一形態における被破壊物３の破壊方法を、図６および図７に基づいて説明する。
まず、被破壊物３の水平自由面（一方の自由面）１２に垂直方向に破壊用孔４ａを鉛直自由面（他方の自由面）１５に沿って形成する。また、鉛直自由面１５に垂直方向に破壊用孔４ｂを水平自由面１２に沿って形成する。
【００１６】
また、各破壊容器１３Ａに破壊用物質１３を充填し、電極２を接続した金属細線５ａを各破壊容器１３Ａに挿入し、金属細線５ａを破壊用物質１３に浸漬して破壊プローブＰ１を形成し、各破壊用孔４ａ，４ｂに破壊プローブＰ１を破壊用孔４ａ，４ｂの深さ方向に沿って装着する。
【００１７】
そして、各破壊プローブＰ１の電極２に、電気エネルギー供給回路６を接続してコンデンサー８に所定の電気容量を蓄積した後、放電スイッチ１１をオンする。そうすると、各金属細線５ａに所定量の電気エネルギーが短時間で供給されてこれらが急激に溶融蒸発するとともに、各破壊容器１３Ａ内の破壊用物質１３が急激に気化して膨張し、その膨張力で被破壊物３が破壊される。
【００１８】
ここで、上記破壊方法において、破壊用孔４ａ，４ｂに破壊プローブＰ１を設置する際の条件を説明する。
まず、鉛直自由面１５から破壊用孔４ａの中心（金属細線５ａの配置位置）までの距離Ｙを、（ｆ）式に対応する下記式（１）により決定する。
【００１９】
Ｙ≦Ｍ（２・Ｒｄ’＋Ｌｐ’）＋Ｒｄ・・・（１）
ここで、Ｍ：破壊用孔４ｂに装着する金属細線５ａの個数
Ｒｄ’：破壊用孔４ｂに装着する金属細線５ａによる破壊可能領域限界
Ｌｐ’：破壊用孔４ｂに装着する金属細線５ａの長さ
Ｒｄ：破壊用孔４ａに装着する金属細線５ａによる破壊可能領域限界
である。
【００２０】
また、水平自由面１２から破壊用孔４ｂの中心（金属細線５ａの配置位置）までの距離Ｙ’を、（ｇ）式に対応する下記式（２）により決定する。
Ｙ’≦Ｎ（２・Ｒｄ＋Ｌｐ）＋Ｒｄ’ ・・・（２）
ここで、Ｌｐ：破壊用孔４ａに装着する金属細線５ａの長さ
Ｎ：破壊用孔４ａに装着する金属細線５ａの個数
である。
【００２１】
また、水平自由面１２とその水平自由面１２から金属細線５ａの基端部までの距離Ｚ_oは、（ａ）式に対応する下記式（３）の関係を設定し、
Ｚ_o≦Ｒｄ・・・（３）
鉛直自由面１５とその自由面１５から金属細線５ａの基端部までの距離Ｚ_o’は、（ｂ）式に対応する下記（４）式の関係を設定する。
【００２２】
Ｚ_o’≦Ｒｄ’ ・・・（４）
そして、金属細線５ａ同士の先端部間の距離Ａ、前記距離Ｒｄおよび距離Ｒｄ’の関係が、（ｃ）に対応する下記（５）式
Ａ≦Ｒｄ＋Ｒｄ’ ・・・（５）
を満足するよう設定する。
【００２３】
ところで上記（１）〜（５）式におけるＲｄ（Ｒｄ’も同様）の値は、コンデンサー８への蓄積エネルギーＷ(J)，コンデンサー容量Ｃ(F)，充電電圧(V)によって決まるもので、これら各要素の関係は、（ｊ）式に対応する下記の（６）式、（ｉ）（ｉ ' ）式にそれぞれ対応する下記の（７）（７ ' ）式となる。
【００２４】
Ｗ＝（Ｃ×Ｖ ^２）／２・・・（６）
Ｒｄ≦（√Ｗ）／ｋ・・・（７）
Ｒｄ ' ≦（√Ｗ）／ｋ・・・（７ ' ）
但し（７）（７ ' ）式において、ｋはエネルギー・破壊可能領域変換係数で、ｋ＝1.5とする。
【００２５】
ここで、コンデンサー容量Ｃ＝100(μF) ,充電電圧＝15000(V)を、上記（６）式に代入すると、
Ｗ＝（Ｃ×Ｖ ^２）／２＝11,250(J)
となる。これを、上記（７）（７ ' ）式に代入すると、
Ｒｄ≦（√Ｗ）／ｋ≦70.7(cm)
Ｒｄ ' ≦（√Ｗ）／ｋ≦ 70.7(cm)
となるので、Ｒｄ＝70(cm)，Ｒｄ ' ＝ 70(cm)とする。
【００２６】
図６および図７において、（１）式より、Ｙ≦Ｍ（２・Ｒｄ’＋Ｌｐ’）＋Ｒｄ＝３（２・70＋10）＋70＝370 であるから、Ｙ＝350(cm) とし、（２）式よりＹ’≦Ｎ（２・Ｒｄ＋Ｌｐ）＋Ｒｄ’＝３（２・70＋10）＋70＝370 であるからＹ’＝350(cm) とし、（３）式よりＺ_o≦Ｒｄ＝70であるからＺ_o＝50(cm)とし、（４）式よりＺ_o’≦Ｒｄ’＝70であるからＺ_o’＝50(cm)とし、（５）式よりＡ≦Ｒｄ＋Ｒｄ’＝70＋70＝140であるからＡ＝100(cm) とした。
【００２７】
上記各条件に基づいて、一軸圧縮強度1,500kg/cm²の花崗岩壁において破壊作業を行った結果、この花崗岩壁（被破壊物３）は、予測どおり、図６に示すように、破壊用孔４ａと破壊用孔４ｂで囲まれる目的部分Ｇが破壊（崩落）し、破壊用孔４ａ、破壊用孔４ｂ側の各金属細線５ｃの端部同士を結ぶ線に沿った傾斜した破壊面Ｇ１を得た。
【００２８】
なお、蓄積エネルギーＷ(J) と金属細線５ａ〜５ｃから破壊可能領域限界までの距離Ｒｄ(cm)との関係は、図４のグラフ図に示すようになる。
このように、本発明の実施の第一形態によれば、電気エネルギー供給回路６におけるコンデンサー８への蓄積エネルギー，コンデンサー容量，充電電圧に基づいて、金属細線５ａ〜５ｃから破壊可能領域限界までの距離Ｒｄ（Ｒｄ’）を決定し、各破壊用孔４ａ，４ｂの深さおよび位置、そして破壊用孔４ａ，４ｂに装着する各金属細線５ａの配置位置を設定するので、被破壊物３の目的部分Ｇを経済的かつ十分に破壊することができる。
【００２９】
また、破壊用物質１３を破壊容器１３Ａに充填することにより、破壊用孔４の方向が横向きや下向きであっても破壊用物質１３が破壊用孔４から零れ出してしまうことがなく、破壊作業の際の対応性を向上させることができる。
【００３０】
次に図８〜図１０に基づいて、本発明の実施の第二形態を説明する。破壊プローブＰおよび破壊装置１の構成は、上記実施の第一形態と同様であるので省略する。
【００３１】
本発明の実施の第二形態に係る破壊方法は、図８に示すように、複数（図では３個）の破壊容器１３Ａに破壊用物質１３を充填し、電極２を接続した金属細線５ａ〜５ｃを各破壊容器１３Ａに挿入し、各金属細線５ａ〜５ｃを破壊用物質１３に浸漬することにより破壊プローブＰ１〜Ｐ３を複数個形成し、図９（但し図９には破壊プローブＰ１〜Ｐ３は省略している）に示すように、破壊用孔４ａを複数個形成し、各破壊用孔４ａに破壊プローブＰ１〜Ｐ３を破壊用孔４ａの深さ方向に沿って装着する。
【００３２】
また、被破壊物３の鉛直自由面１５に垂直方向で水平自由面１２に沿って、破壊用孔４ｂを複数個形成する。そして、各破壊容器１３Ａに破壊用物質１３を充填し、電極２を接続した金属細線５ａ〜５ｃを各破壊容器１３Ａに挿入し、金属細線５ａ〜５ｃを破壊用物質１３に浸漬して破壊プローブＰ１〜Ｐ３を複数個形成し、各破壊用孔４ｂに破壊プローブＰ１〜Ｐ３を破壊用孔４ｂの深さ方向に沿って装着する。
【００３３】
そして、各破壊プローブＰ１〜Ｐ３の電極２に、電気エネルギー供給回路６を接続してコンデンサー８に所定の電気容量を蓄積した後、放電スイッチ１１をオンする。
【００３４】
そうすると、各金属細線５ａ〜５ｃに所定量の電気エネルギーが短時間で供給されてこれらが急激に溶融蒸発するとともに、各破壊容器１３Ａ内の破壊用物質１３が急激に気化して膨張し、その膨張力で被破壊物３が破壊される。
【００３５】
上記破壊方法において、各破壊用孔４ａ，４ｂに破壊プローブＰ１〜Ｐ３を設置する際の条件を、図８および図９に基づいて説明する。
まず、上記実施の第一形態と同様に、鉛直自由面１５から破壊用孔４ａの中心（金属細線５ａ〜５ｃの配置位置）までの距離Ｙを下記式（１）により決定する。
【００３６】
Ｙ≦Ｍ（２・Ｒｄ’＋Ｌｐ’）＋Ｒｄ・・・（１）
また、水平自由面１２から破壊用孔４ｂの中心（金属細線５ａ〜５ｃの配置位置）までの距離Ｙ’を下記式（２）により決定する。
【００３７】
Ｙ’≦Ｎ（２・Ｒｄ＋Ｌｐ）＋Ｒｄ’ ・・・（２）
また、水平自由面１２とその水平自由面１２から最も近い金属細線５ａの基端部までの距離Ｚ_oは、下記（３）式の関係を設定する。
【００３８】
Ｚ_o≦Ｒｄ・・・（３）
鉛直自由面１５とその自由面１５から最も近い金属細線５ａの基端部までの距離Ｚ_o’は、下記（４）式の関係を設定する。
【００３９】
Ｚ_o’≦Ｒｄ’ ・・・（４）
そして、図６の実施の第一形態で示したように、各自由面１２，１５から最も遠い金属細線５ｃ，５ｃ同士の先端部間の距離Ａ、前記距離Ｒｄおよび距離Ｒｄ’の関係が、下記（５）式
Ａ≦Ｒｄ＋Ｒｄ’ ・・・（５）
を満足するよう設定する。
【００４０】
また、水平自由面１２とその自由面１２から最も遠い金属細線５ｃの先端部までの距離Ｚは、（ｄ）式に対応する下記（８）式の条件に設定する。
Ｚ≦Ｒｄ（２・Ｎ−１）＋Ｎ・Ｌｐ・・・（８）
鉛直自由面１５とその自由面１５から最も遠い金属細線５ｃの先端部までの距離Ｚ’は、（ｅ）式に対応する下記（９）式の条件に設定する。
【００４１】
Ｚ’≦Ｒｄ’（２・Ｍ−１）＋Ｍ・Ｌｐ’ ・・・（９）
破壊用孔４ａ側の金属細線５ａの先端部から金属細線５ｂの基端部間の距離Ｚｐは、下記（１０）式の関係を設定する。
【００４２】
Ｚｐ≦２・Ｒｄ・・・（１０）
破壊用孔４ｂ側の金属細線５ａの先端部から金属細線５ｂの基端部間の距離Ｚｐ’は、下記（１１）式の関係を設定する。
【００４３】
Ｚｐ’≦２・Ｒｄ’ ・・・（１１）
また、破壊用孔４ａの中心間の距離Ｘ（破壊用孔４ｂの中心間の距離も同様）は、下記（１２）式を満足するよう設定する。
【００４４】
Ｘ≦２・Ｒｄ・・・（１２）
ところで上記（１）〜（１２）式におけるＲｄ（Ｒｄ’も同様）の値は、実施の第一形態と同様に、コンデンサー８への蓄積エネルギーＷ(J) ，コンデンサー容量Ｃ(F) ，充電電圧(V) によって決まるもので、これら各要素の関係は、下記（６），（７）式となる。
【００４５】
Ｗ＝１／２・Ｃ・Ｖ² ・・・（６）
Ｒｄ≦（√Ｗ）／ｋ・・・（７）
ここで、コンデンサー容量Ｃ＝100(μF ）, 充電電圧＝15000(V)を、上記（６）式に代入すると、
Ｗ＝１／２・Ｃ・Ｖ²＝11,250(J)
となる。これを、上記（７）式に代入すると、
Ｒｄ≦（√Ｗ）／ｋ≒70.7(cm)
となるので、Ｒｄ=70(cm) とする。
【００４６】
図８および図９において、（１）式より、Ｙ≦Ｍ（２・Ｒｄ’＋Ｌｐ’）＋Ｒｄ＝３（２・70＋10）＋70＝370 であるから、Ｙ＝350(cm) とし、（２）式よりＹ’≦Ｎ（２・Ｒｄ＋Ｌｐ）＋Ｒｄ’＝３（２・70＋10）＋70＝370 であるからＹ’＝350(cm) とし、（３）式よりＺ_o≦Ｒｄ＝70であるからＺ_o＝50(cm)とし、（４）式よりＺ_o’≦Ｒｄ’＝70であるからＺ_o’＝50(cm)とし、（５）式よりＡ≦Ｒｄ＋Ｒｄ’＝70＋70＝140 であるからＡ＝100(cm) とし、（８）式よりＺ≦Ｒｄ（２・Ｎ−１）＋Ｎ・Ｌｐ＝70（２・３−１）＋３・10＝380 であるからＺ＝350(cm) とし、（９）式よりＺ’≦Ｒｄ’（２・Ｍ−１）＋Ｍ・Ｌｐ’＝70（２・３−１）＋３・10＝380 であるからＺ’＝350(cm) とし、（１０）式よりＺｐ≦２・Ｒｄ＝２・70＝140 であるからＺｐ＝100(cm) とし、（１１）式よりＺｐ’≦２・Ｒｄ’２・70＝140 であるからＺｐ’＝100(cm) とし、（１２）式よりＸ≦２・Ｒｄ＝２・70＝140 あるからＸ＝100(cm) とした。
【００４７】
上記各条件に基づいて、一軸圧縮強度1,500kg/cm²の花崗岩壁において破壊作業を行った結果、この花崗岩壁（被破壊物３）は、予測どおり、図１０に示すように、破壊用孔４ａと破壊用孔４ｂで囲まれる目的部分Ｇが破壊（崩落）し、破壊用孔４ａ、破壊用孔４ｂ側の各金属細線５ｃの端部同士を結ぶ線に沿った傾斜した破壊面Ｇ１を得た。
【００４８】
このように、本発明の実施の第二形態によれば、電気エネルギー供給回路６におけるコンデンサー８への蓄積エネルギー，コンデンサー容量，充電電圧に基づいて、金属細線５ａ〜５ｃから破壊可能領域限界までの距離Ｒｄ（Ｒｄ’）を決定し、各破壊用孔４ａ，４ｂの深さおよび位置、そして破壊用孔４ａ，４ｂに装着する各金属細線５ａ〜５ｃの配置位置を設定するので、被破壊物３の目的部分Ｇを経済的かつ十分に破壊することができる。
【００４９】
また、破壊用物質１３を破壊容器１３Ａに充填することにより、破壊用孔４の方向が横向きや下向きであっても破壊用物質１３が破壊用孔４から零れ出してしまうことがなく、破壊作業の際の対応性を向上させることができる。
【００５０】
次に、図１１および図１２に基づいて、本発明の実施の第三形態を説明する。本発明の実施の第三形態に係る破壊方法は、各自由面１２，１５に破壊用孔４ａ，４ｂを垂直に、かつその延長がずれるように形成するもので、破壊装置１の構成は上記実施の第一形態と同様である。また、破壊手順も上記実施の第二形態と同様であるが、本発明の実施の第三形態では、上記実施の第一形態の（１）〜（１２）で示した関係に加え、図１２の平面図に示すように、破壊用孔４ａ，４ｂ側の各金属細線５ｃの先端部間のずれの距離Ｄ、距離Ｒｄおよび距離Ｒｄ’の関係が、下記（１３）式
Ｄ≦Ｒｄ＋Ｒｄ’ ・・・（１３）
を満足するよう設定したものである。
【００５１】
上記（１３）式よりＤ≦Ｒｄ＋Ｒｄ’＝70＋70＝140 であるから、Ｄ＝100(cm) とした。
この破壊方法によっても、破壊用孔４ａと破壊用孔４ｂで囲まれる目的部分が破壊し、破壊用孔４ａ、破壊用孔４ｂ側の各金属細線５ｃの端部同士を結ぶ線に沿った傾斜した破壊面Ｇ１を得られた。
【００５２】
なお、上記各実施の形態では、破壊容器１３Ａに破壊用物質１３を充填したがこれに限定されるものではなく、破壊容器１３Ａを設けることなく、破壊用孔４に直接破壊用物質１３を充填し、電極２間を接続した金属細線を破壊用孔４の深さ方向に沿って配置するようにして破壊用物質１３に浸漬しても、上記各実施の形態と同様の破壊を行い得る。
【００５３】
【発明の効果】
以上の説明から明らかな通り、本発明は、金属細線が溶融蒸発するとともに破壊用物質が膨張する際の破壊可能領域を設定して、被破壊物の破壊しようとする部分が破壊可能領域内に入るように自由面から破壊用孔の距離および金属細線の挿入深さを設定して破壊するので、経済的かつ確実に被破壊物を破壊することができる。
【図面の簡単な説明】
【図１】本発明の実施の第一形態を示す破壊方法における破壊用孔に１個の破壊プローブを挿入した状態の縦断面図である。
【図２】同じく平面図である。
【図３】同じく破壊装置の全体構成図である。
【図４】同じく破壊可能領域を示すモデル図である。
【図５】同じく蓄積エネルギーと破壊可能領域限界の関係を示すグラフ図である。
【図６】同じく各破壊用孔に破壊プローブを挿入した状態の縦断面図である。
【図７】同じく平面図である。
【図８】本発明の実施の第二形態において３個の破壊プローブを破壊用孔に装着した状態の拡大断面図である。
【図９】同じく被破壊物に複数の破壊用孔を形成した状態の斜視図である。
【図１０】同じく破壊後の被破壊物の斜視図である。
【図１１】本発明の実施の第三形態を示す破壊方法において各破壊用孔に破壊プローブを挿入した状態の縦断面図である。
【図１２】同じく平面図である。
【符号の説明】
１破壊装置
２電極
３被破壊物
４ａ破壊用孔
５ａ金属細線
６電気エネルギー供給回路
７電源装置
８コンデンサー
１０充電制御回路
１１放電スイッチ
１２水平自由面
１３破壊用物質
１３Ａ破壊容器
１５鉛直自由面
４０破壊用孔群
Ｍｆ破壊可能領域
Ｐ１破壊プローブ
Ｒｄ破壊可能領域限界までの距離
Ｌｐ金属細線長[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a destruction method for destroying an object to be destroyed such as a concrete structure or a rock using electric energy.
[0002]
[Prior art]
Conventionally, the destruction method of destroying a destructive object such as a concrete structure or a bedrock using electric energy is to connect a pair of electrodes connected via a thin metal wire to a capacitor, The mounting holes are drilled at predetermined intervals or at predetermined distances from the free surface, and a destructive substance such as water or oil is injected into these mounting holes, and electrodes are mounted in the mounting holes to store the electric energy accumulated in the capacitor. By supplying a discharge to a thin metal wire in a short time and rapidly evaporating and evaporating the thin metal wire, the destruction material is rapidly vaporized, and the material to be destroyed is destroyed or weakened by the expansion force at that time. .
[0003]
[Problems to be solved by the invention]
As described above, since the interval between the mounting holes formed in the object to be destroyed is determined by experience, depending on the electric energy accumulated in the capacitor, that is, the magnitude of the charging voltage, the fracture surfaces (cracks) generated between the mounting holes may be different. If the connection holes are not connected, the breakage is insufficient, or the interval between the mounting holes is narrow compared to the magnitude of the charging voltage, the breakage is sufficiently performed, but there is a problem that it is uneconomical.
[0004]
Then, this invention aims at provision of the destruction device which can solve the said subject.
[0005]
[Means for Solving the Problems]
The means according to claim 1 for solving the problem in the present invention is to fill each free surface of the object to be destroyed having free surfaces in two different directions with a destructive substance that destroys the object to be destroyed by expansion. Breaking holes are vertically formed so that their extensions intersect, and a metal wire connecting the electrodes is placed along each of the breaking holes along the depth direction of the breaking hole and immersed in the breaking material. The destructive substance is vaporized by supplying electric energy from the charged capacitor to the fine metal wire through the electrode in a short time and evaporating and evaporating the fine metal wire. The distance Z from the one free surface to the base end of the fine metal wire placed in the destruction hole when the destruction object is destroyed in the destruction area of _o and the proximal portion of the metal thin wires Relationship between the distance Rd to the destructible range limit of al one of the free surface side, and set so as to satisfy the following equation (a) Z _o ≦ Rd (a), disposed on its destruction hole from the other free surface The relationship between the distance Z _o ′ to the base end of the thin metal wire and the distance Rd ′ from the base end of the metal thin wire to the limit of the destructible region on the other free surface is expressed by the following formula (b) Z _o ′ ≦ Rd ′ (b) is a destruction method set to satisfy (b), and the relationship between the distance A between the tips of the respective thin metal wires, the distance Rd and the distance Rd ′ is expressed by the following formula (c): A ≦ Rd + Rd ′ ( c), and the distances Rd and Rd ′ from the base end of the thin metal wire to the breakable region limit in the formulas (a) to (c) are the electric energy W (J), energy / breakage Assuming that the possible region conversion coefficient k, the following equation (i) Rd ≦ (√W) / k (i) and (I ′ ) When the equation Rd ′ ≦ (√W) / k (i ′ ) is set so as to satisfy each, the electric energy W is assumed to be a capacitor capacity C (F) for storing electric energy and a charging voltage V (V). The following equation (j) is set so as to satisfy the equation W = (C × V ² ) / 2 (j).
[0006]
According to a second aspect of the present invention, each of the free surfaces of the object to be destroyed having two free surfaces in different directions is provided with a breaking hole for filling a material for destruction that destroys the object to be destroyed by expansion. It is formed vertically so that each of the breaking holes is immersed in a breaking substance by arranging a plurality of fine metal wires connected between the electrodes along the depth direction of the breaking hole and at predetermined intervals. By supplying electrical energy from a charged capacitor to the metal thin wire through the electrode in a short time and rapidly evaporating and evaporating the metal thin wire, the destructive material is vaporized, and the predetermined destruction from the metal thin wire is caused by the expansion force at that time. only area fraction so as to destroy the debris, when installing a metallic thin wire into each fracture holes, the distance Z _o and up to the base end portion of the nearest thin metal wire from one free surface and its free surface From the base end of the thin metal wire, Relationship between the distance Rd to the destructible range limit of the surface side, the following equation (a) Z _o ≦ Rd set to satisfy (a), the proximal end nearest the thin metal wires from the other free surface and its free surface The relationship between the distance Z _o ′ to the portion and the distance Rd ′ from the base end of the fine metal wire to the limit of the destructible region on the other free surface is expressed by the following formula (b) Z _o ′ ≦ Rd ′ (b) The relationship between the distance A between the tips of the fine metal wires farthest from each free surface, the distance Rd and the distance Rd ′ is expressed by the following formula (c) A ≦ Rd + Rd ′ (C) is set so as to satisfy, the distance Z from one free surface to the base end of the thin metal wire farthest from the free surface, the distance Rd, and the metal to be inserted into one breaking hole in one free surface The relationship between the number N of fine wires and the length Lp of each metal fine wire is expressed by the following formula (d) Z ≦ Rd (2 · N -1) is set so as to satisfy + N · Lp (d), the distance Z ′ from the other free surface to the base end of the thin metal wire farthest from the free surface, the distance Rd ′, one of the other free surfaces The relationship between the number M of fine metal wires inserted into the fracture hole and the length Ld ′ of each fine metal wire satisfies the following formula (e): Z ′ ≦ Rd ′ (2 · M−1) + M · Lp ′ (e) The relationship between the distance Y from the other free surface to the breaking hole formed on one free surface, the distances Rd and Rd ′, the number M of fine metal wires, and the fine metal wire length Lp ′ is as follows (f ) The formula Y ≦ M (2.Rd ′ + Lp ′) + Rd (f) is set so that the distance Y ′ from one free surface to the breaking hole formed in the other free surface, the distances Rd, Rd ', The relationship between the number M of the fine metal wires and the length Lp of the fine metal wires is expressed by the following formula (g) Y ′ ≦ N (2 · Rd + Lp) + Rd ′ (g Set to satisfy the formula (a) ~ (g) distance Rd and Rd 'to break area limit from the base end portion of the thin metal wire in the expression, the electrical energy W (J), the energy-breaking region Assuming that the conversion coefficient is k, the following equation (i) Rd ≦ (√W) / k (i) and (i ′ ) Equation Rd ′ ≦ (√W) / k (i ′ ) The energy W is set so as to satisfy the following formula (j) W = (C × V ² ) / 2 (j), assuming that the capacitor capacity C (F) for storing electric energy and the charging voltage V (V) . .
[0007]
According to a third aspect of the present invention, a plurality of breaking holes are arranged along each free surface.
According to a fourth aspect of the present invention, each of the free surfaces of the object to be destructed having different free surfaces in two directions has a destructive hole vertically for filling a destructive substance for destroying the object to be destructed by expansion, and The metal wires connected between the electrodes are arranged along the depth direction of the breaking holes and immersed in the breaking material, and the electrodes are charged from the charged capacitors. The material for destruction is vaporized by supplying electric energy to the fine metal wire in a short time and rapidly evaporating and evaporating the fine metal wire. When destroying an object and installing a fine metal wire in each destruction hole, the distance Z _o from one free surface to the proximal end of the fine metal wire arranged in the destruction hole and the proximal end of the fine metal wire Destructible area on one free side from the part Distance relationship between the distance Rd to the limit, set to satisfy the following equation (a) Z _o ≦ Rd (a), the other free surface to the base end portion of the thin metal wires arranged in its destruction hole to Z _o relation between 'and the distance Rd from the base end portion of the metal thin wire to fracture region limits of other free surface' is, satisfies the following formula (b) Z _o '≦ Rd' (b) In the set destruction method, the relationship between the distance A between the tips of the respective thin metal wires, the distance Rd and the distance Rd ′ satisfies the following formula (c) A ≦ Rd + Rd ′ (c), The relationship between the deviation distance D between the tips of the respective fine metal wires, the distance Rd and the distance Rd ′ is set so as to satisfy the following expression (h) D ≦ Rd + Rd ′ (h), and the expressions (a) to ( c) Distances Rd and Rd from the base end of the thin metal wire to the limit of the breakable region in the formula (h) ′ Is the electric energy W (J) and the energy / destructible region conversion coefficient k, the following equation (i) Rd ≦ (√W) / k (i) and (i ′ ) Rd ′ ≦ (√W) / K (i ′ ) is set so as to satisfy each, and the electric energy W is a capacitor capacity C (F) for storing electric energy and a charging voltage V (V), and the following equation (j) W = (C × V ² ) / 2 (j) is set to be satisfied.
[0008]
According to a fifth aspect of the present invention, each of the free surfaces of the object to be destructed having different free surfaces in two directions has a destructive hole for filling a destructive substance for destructing the object to be destructed by expansion vertically, and Formed in such a way that the extension is shifted, and in each of the breaking holes, a plurality of fine metal wires connected between the electrodes are arranged along the depth direction of the breaking hole at predetermined intervals and immersed in the breaking material. The material for destruction is vaporized by supplying electric energy from the charged capacitor to the fine metal wire through the electrode in a short time and rapidly evaporating and evaporating the fine metal wire. In order to destroy the object to be destroyed by the destructible area, and when installing the fine metal wire in each destruction hole, the distance Z _o between one free surface and the base end of the fine metal wire closest to the free surface and One side from the base end of the thin metal wire Relationship between the distance Rd to the destructible range limit of the derived surface side, the following equation (a) Z _o ≦ Rd set to satisfy (a), the nearest thin metal wire group from the other free surface and its free surface The relationship between the distance Z _o ′ to the end and the distance Rd ′ from the base end of the thin metal wire to the destructible region limit on the other free surface is expressed by the following equation (b) Z _o ′ ≦ Rd ′ (b ), And the relationship between the distance A between the tips of the respective fine metal wires, the distance Rd, and the distance Rd ′ satisfies the following formula (c) A ≦ Rd + Rd ′ (c) The distance Z from one free surface to the distal end of the thin metal wire farthest from the free surface, the distance Rd, the number N of fine metal wires inserted into one breaking hole in one free surface, and each metal The relationship of the thin wire length Lp is as follows: (d) Formula Z ≦ Rd (2 · N−1) + N · Lp (d Of the other free surface and the distance Z ′ from the free surface to the tip of the thin metal wire farthest from the free surface, the distance Rd ′, and the thin metal wire to be inserted into one breaking hole of the other free surface. The relationship between the number M and the length Lp ′ of each thin metal wire is set so as to satisfy the following formula (e): Z ′ ≦ Rd ′ (2 · M−1) + M · Lp ′ (e). The relationship between the distance Y to the breaking hole formed on one free surface, the distances Rd, Rd ′, the number M of fine metal wires and the length Lp ′ of the fine metal wires is expressed by the following formula (f): Y ≦ M (2.Rd ′ + Lp ′) + Rd (f), the distance Y ′ from one free surface to the breaking hole formed in the other free surface, the distances Rd and Rd ′, the number M of fine metal wires, and the fine metal wires Set so that the relationship of length Lp satisfies the following formula (g): Y ′ ≦ N (2.Rd + Lp) + Rd ′ (g) Deviation of the distance D between the tips of the thin metal wire, the distance Rd and the distance Rd 'relationship of the following (h) Formula D ≦ Rd + Rd' set so as to satisfy the (h), the equation (a) - ( h) If the distances Rd and Rd ′ from the base end of the thin metal wire to the limit of the destructible region are represented by the electric energy W (J) and the energy / destructible region conversion coefficient k, the following equation (i) Rd ≦ ( √W) / k (i) and (i ′ ) are set so as to satisfy the expressions Rd ′ ≦ (√W) / k (i ′ ), and the electric energy W is a capacitor capacity C (F) for storing electric energy. When the charging voltage is V (V), the following equation (j) is set to satisfy W = (C × V ² ) / 2 (j).
[0009]
A plurality of breaking holes are arranged along each free surface.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
First, the destruction method according to the first embodiment of the present invention will be described with reference to FIGS. First, the structure of the destruction apparatus 1 for implementing the destruction method which concerns on 1st embodiment of this invention is demonstrated.
[0011]
As shown in FIG. 3, the breaking device 1 includes metal wires (for example, Cu are used) in which the tip portions of the electrodes 2 provided in pairs are along the depth direction of the breaking hole 4 formed in the destruction target 3. The thin metal wire 5 is attached to a destruction container 13A filled with a destructive substance (for example, a jelly-like substance is used) for destroying the destruction target 3 by expansion. Thus, the destruction probe 13 is filled with the destruction substance 13 in the destruction container 13A and the thin metal wire 5 and the electrode 2 are inserted.
[0012]
As shown in the figure, an electric energy supply circuit 6 for supplying electric energy sufficient to melt and evaporate the fine metal wire 5 through the electrode 2 of the destruction probe P is connected. The circuit 6 is connected in series between a power supply device (DC power supply is used) 7 connected to the terminal 2a of each electrode 2 and the power supply device 7 and one terminal 2a. A charge control circuit 10 for controlling a capacitor 8 connected in parallel with 2a to store a predetermined amount of electric capacity, and a discharge connected between the charge control circuit 10 and one terminal 2a. And switch 11.
[0013]
Next, the destructible region Mf of one thin metal wire 5 (destruction device 1) will be described with reference to FIGS. In the figure, the range indicated by the phantom line is the destructible region Mf, and the arrow indicates the propagation direction of the impact force. This destructible region (volume) Mf is expressed by the following equation.
[0014]
Mf = π · Rd ² · (4/3 · Rd + Lp)
Here, Rd is the breakable region limit (impact force propagation distance), and Lp is the length of the thin metal wire 5.
[0015]
Next, the destruction method of the to-be-destructed object 3 in 1st Embodiment is demonstrated based on FIG. 6 and FIG.
First, a breaking hole 4a is formed along a vertical free surface (the other free surface) 15 in a direction perpendicular to the horizontal free surface (one free surface) 12 of the object 3 to be destroyed. Further, a breaking hole 4 b is formed along the horizontal free surface 12 in the vertical direction on the vertical free surface 15.
[0016]
Further, each destruction container 13A is filled with the destruction material 13, the fine metal wire 5a connected to the electrode 2 is inserted into each destruction container 13A, and the fine metal wire 5a is immersed in the destruction material 13 to form the destruction probe P1. The destruction probe P1 is attached to each of the breaking holes 4a and 4b along the depth direction of the breaking holes 4a and 4b.
[0017]
Then, the electric energy supply circuit 6 is connected to the electrode 2 of each destruction probe P1 to accumulate a predetermined electric capacity in the capacitor 8, and then the discharge switch 11 is turned on. Then, a predetermined amount of electric energy is supplied to each metal wire 5a in a short time, and these rapidly melt and evaporate, and the destruction substance 13 in each destruction container 13A rapidly vaporizes and expands. The to-be-destructed object 3 is destroyed.
[0018]
Here, in the above destructive method, conditions for installing the destructive probe P1 in the destructive holes 4a and 4b will be described.
First, the distance Y from the vertical free surface 15 to the center of the breaking hole 4a (arrangement position of the thin metal wire 5a) is determined by the following equation (1) corresponding to the equation (f).
[0019]
Y ≦ M (2 · Rd ′ + Lp ′) + Rd (1)
Here, M: the number of fine metal wires 5a attached to the breaking holes 4b Rd ': a destructible area limit Lp' of the fine metal wires 5a attached to the breaking holes 4b: the length of the fine metal wires 5a attached to the breaking holes 4b Rd: a destructible region limit by the fine metal wire 5a attached to the breaking hole 4a.
[0020]
Further, the distance Y ′ from the horizontal free surface 12 to the center of the breaking hole 4b (arrangement position of the thin metal wire 5a) is determined by the following equation (2) corresponding to the equation (g).
Y ′ ≦ N (2 · Rd + Lp) + Rd ′ (2)
Here, Lp is the length of the fine metal wire 5a attached to the breaking hole 4a, and N is the number of the fine metal wires 5a attached to the breaking hole 4a.
[0021]
The distance Z _o of the horizontal free surface 12 from the horizontal free surface 12 to the proximal end portion of the thin metal wires 5a sets the relationship between (a) the following formula corresponding to formula (3),
Z _o ≦ Rd (3)
The vertical free surface 15 and the distance Z _o ′ from the free surface 15 to the base end of the thin metal wire 5a set the relationship of the following equation (4) corresponding to the equation (b).
[0022]
Z _o '≦ Rd' (4)
The relationship between the distance A between the tips of the thin metal wires 5a, the distance Rd, and the distance Rd ′ is expressed by the following formula (5) corresponding to (c) A ≦ Rd + Rd ′ (5)
Set to satisfy.
[0023]
By the way, the value of Rd (the same applies to Rd ′) in the above equations (1) to (5) is determined by the energy W (J) stored in the capacitor 8, the capacitor capacity C (F), and the charging voltage (V). The relationship between these elements is the following expression (6) corresponding to the expression (j) and the following expressions (7) and (7 ' ) corresponding to the expressions (i) and (i ′ ) .
[0024]
W = (C × V ² ) / 2 ... (6)
Rd ≦ (√W) / k (7)
Rd ′ ≦ (√W) / k (7 ′ )
However, in equation (7) (7 ′ ) , k is an energy / destructible region conversion coefficient, and k = 1.5.
[0025]
Here, when the capacitor capacity C = 100 (μF) and the charging voltage = 15000 (V) are substituted into the above equation (6),
W = (C × V ² ) / 2 = 11,250 (J)
It becomes. Substituting this into the equation (7) (7 ' ) above,
Rd ≦ (√W) /k≦70.7 (cm)
Rd ′ ≦ (√W) /k≦70.7 (cm)
Therefore, Rd = 70 (cm) and Rd ′ = 70 (cm) .
[0026]
In FIG. 6 and FIG. 7, from equation (1), Y ≦ M (2.Rd ′ + Lp ′) + Rd = 3 (2.70 + 10) + 70 = 370. Therefore, Y = 350 (cm) and (2) From the equation, Y ′ ≦ N (2 · Rd + Lp) + Rd ′ = 3 (2.70 + 10) + 70 = 370, so Y ′ = 350 (cm), and from equation (3), Z _o ≦ Rd = 70. _{Since o} = 50 (cm) and Z _o ′ ≦ Rd ′ = 70 from the equation (4), Z _o ′ = 50 (cm), and from the equation (5), A ≦ Rd + Rd ′ = 70 + 70 = 140. A = 100 (cm).
[0027]
Based on the above conditions, as a result of fracture work on a uniaxial compressive strength 1,500 kg / cm ² granite wall, this granite wall (destructed object 3) is, as predicted, shown in FIG. The target portion G surrounded by 4a and the breaking hole 4b is broken (collapsed), and an inclined broken surface G1 along the line connecting the ends of the metal thin wires 5c on the side of the breaking hole 4a and the breaking hole 4b is formed. Obtained.
[0028]
The relationship between the stored energy W (J) and the distance Rd (cm) from the fine metal wires 5a to 5c to the limit of the breakable region is as shown in the graph of FIG.
Thus, according to the first embodiment of the present invention, from the thin metal wires 5a to 5c to the destructible region limit based on the energy stored in the capacitor 8, the capacitor capacity, and the charging voltage in the electric energy supply circuit 6. The distance Rd (Rd ′) is determined, and the depth and position of each breaking hole 4a, 4b and the arrangement position of each metal thin wire 5a to be fitted to the breaking holes 4a, 4b are set. The target portion G can be destroyed economically and sufficiently.
[0029]
Further, by filling the destruction container 13 with the destruction substance 13A, the destruction substance 13 does not spill out of the destruction hole 4 even if the direction of the destruction hole 4 is lateral or downward, and the destruction work is performed. In this case, it is possible to improve the correspondence.
[0030]
Next, a second embodiment of the present invention will be described based on FIGS. The configurations of the destruction probe P and the destruction apparatus 1 are the same as those in the first embodiment, and will not be described.
[0031]
In the destruction method according to the second embodiment of the present invention, as shown in FIG. 8, a plurality of (three in the figure) destruction containers 13A are filled with the destruction substance 13 and the metal thin wires 5a to 5 connected with the electrode 2 are connected. A plurality of destruction probes P1 to P3 are formed by inserting 5c into each destruction container 13A and immersing the thin metal wires 5a to 5c in the destruction material 13, and FIG. 9 (however, FIG. 9 shows the destruction probes P1 to P3). As shown in FIG. 4, a plurality of breaking holes 4a are formed, and the breaking probes P1 to P3 are mounted in the breaking holes 4a along the depth direction of the breaking holes 4a.
[0032]
Further, a plurality of breaking holes 4b are formed along the horizontal free surface 12 in a direction perpendicular to the vertical free surface 15 of the object 3 to be destroyed. Then, each destruction container 13A is filled with the destruction material 13, the fine metal wires 5a to 5c connected to the electrode 2 are inserted into each destruction container 13A, and the fine metal wires 5a to 5c are immersed in the destruction material 13 to break the probe. A plurality of P1 to P3 are formed, and the breaking probes P1 to P3 are attached to the respective breaking holes 4b along the depth direction of the breaking holes 4b.
[0033]
And after connecting the electric energy supply circuit 6 to the electrode 2 of each destruction probe P1-P3 and accumulating a predetermined electric capacity in the capacitor | condenser 8, the discharge switch 11 is turned ON.
[0034]
Then, a predetermined amount of electric energy is supplied to each of the thin metal wires 5a to 5c in a short time, and these rapidly melt and evaporate, and the breaking substance 13 in each breaking container 13A rapidly vaporizes and expands, The destruction target 3 is destroyed by the expansion force.
[0035]
In the above destructive method, conditions for installing the destructive probes P1 to P3 in the respective destructive holes 4a and 4b will be described with reference to FIGS.
First, as in the first embodiment, the distance Y from the vertical free surface 15 to the center of the breaking hole 4a (arrangement position of the thin metal wires 5a to 5c) is determined by the following formula (1).
[0036]
Y ≦ M (2 · Rd ′ + Lp ′) + Rd (1)
Further, a distance Y ′ from the horizontal free surface 12 to the center of the breaking hole 4b (arrangement position of the thin metal wires 5a to 5c) is determined by the following equation (2).
[0037]
Y ′ ≦ N (2 · Rd + Lp) + Rd ′ (2)
Further, the distance Z _o from the horizontal free surface 12 to the base end portion of the closest metal thin wire 5a from the horizontal free surface 12 sets the relationship of the following equation (3).
[0038]
Z _o ≦ Rd (3)
The distance Z _o ′ from the vertical free surface 15 to the base end portion of the closest metal thin wire 5a from the free surface 15 sets the relationship of the following equation (4).
[0039]
Z _o '≦ Rd' (4)
As shown in the first embodiment of FIG. 6, the relationship between the distance A between the tips of the metal wires 5c, 5c farthest from the free surfaces 12, 15 and the distance Rd and the distance Rd ′ is as follows. Following (5) Formula A ≦ Rd + Rd ′ (5)
Set to satisfy.
[0040]
Further, the distance Z between the horizontal free surface 12 and the tip of the thin metal wire 5c farthest from the free surface 12 is set to the condition of the following equation (8) corresponding to the equation (d).
Z ≦ Rd (2 · N−1) + N · Lp (8)
The distance Z ′ between the vertical free surface 15 and the tip of the thin metal wire 5c farthest from the free surface 15 is set to the condition of the following equation (9) corresponding to the equation (e).
[0041]
Z ′ ≦ Rd ′ (2 · M−1) + M · Lp ′ (9)
The distance Zp between the distal end portion of the fine metal wire 5a on the destruction hole 4a side and the proximal end portion of the fine metal wire 5b sets the relationship of the following equation (10).
[0042]
Zp ≦ 2 · Rd (10)
The distance Zp ′ between the distal end portion of the fine metal wire 5a on the breaking hole 4b side and the proximal end portion of the fine metal wire 5b sets the relationship of the following equation (11).
[0043]
Zp ′ ≦ 2 · Rd ′ (11)
The distance X between the centers of the breaking holes 4a (same as the distance between the centers of the breaking holes 4b) is set so as to satisfy the following expression (12).
[0044]
X ≦ 2 · Rd (12)
By the way, the values of Rd (the same applies to Rd ′) in the above formulas (1) to (12) are stored energy W (J), capacitor capacity C (F), charge in the capacitor 8 as in the first embodiment. It is determined by the voltage (V), and the relationship between these elements is expressed by the following equations (6) and (7).
[0045]
W = 1/2 · C · V ² (6)
Rd ≦ (√W) / k (7)
Here, when the capacitor capacity C = 100 (μF) and the charging voltage = 15000 (V) are substituted into the above equation (6),
W = 1/2 · C · V ² = 11,250 (J)
It becomes. Substituting this into equation (7) above,
Rd ≦ (√W) /k≒70.7 (cm)
Therefore, Rd = 70 (cm).
[0046]
8 and 9, Y ≦ M (2.Rd ′ + Lp ′) + Rd = 3 (2.70 + 10) + 70 = 370 from the equation (1), so that Y = 350 (cm), and (2) From the equation, Y ′ ≦ N (2 · Rd + Lp) + Rd ′ = 3 (2.70 + 10) + 70 = 370, so Y ′ = 350 (cm), and from equation (3), Z _o ≦ Rd = 70. _{Since o} = 50 (cm) and Z _o ′ ≦ Rd ′ = 70 from the equation (4), Z _o ′ = 50 (cm), and from the equation (5), A ≦ Rd + Rd ′ = 70 + 70 = 140. A = 100 (cm), and from equation (8), Z ≦ Rd (2 · N−1) + N · Lp = 70 (2 · 3-1) + 3 · 10 = 380, so Z = 350 (cm) (9), Z ′ ≦ Rd ′ (2 · M−1) + M · Lp ′ = 70 (2 · 3-1) + 3 · 10 = 380, so that Z ′ = 350 (cm), (10 ) From the equation, Zp ≦ 2 · Rd = 2 · 70 = 140, so Zp = 100 (cm), and from equation (11), Z Since p ′ ≦ 2 · Rd′2 · 70 = 140, Zp ′ = 100 (cm), and from equation (12), X ≦ 2 · Rd = 2 · 70 = 140, so X = 100 (cm) .
[0047]
Based on the above conditions, as a result of fracture work on a granite wall with a uniaxial compressive strength of 1,500 kg / cm ² , this granite wall (destructed object 3) is, as predicted, shown in FIG. The target portion G surrounded by 4a and the breaking hole 4b is broken (collapsed), and an inclined broken surface G1 along the line connecting the ends of the metal thin wires 5c on the side of the breaking hole 4a and the breaking hole 4b is formed. Obtained.
[0048]
As described above, according to the second embodiment of the present invention, from the thin metal wires 5a to 5c to the destructible region limit based on the energy stored in the capacitor 8, the capacitor capacity, and the charging voltage in the electric energy supply circuit 6. The distance Rd (Rd ′) is determined, and the depth and position of each breaking hole 4a, 4b and the arrangement position of each metal thin wire 5a-5c mounted in the breaking hole 4a, 4b are set. The target portion G can be destroyed economically and sufficiently.
[0049]
Further, by filling the destruction container 13 with the destruction substance 13A, the destruction substance 13 does not spill out of the destruction hole 4 even if the direction of the destruction hole 4 is lateral or downward, and the destruction work is performed. In this case, it is possible to improve the correspondence.
[0050]
Next, a third embodiment of the present invention will be described based on FIG. 11 and FIG. In the breaking method according to the third embodiment of the present invention, the breaking holes 4a and 4b are formed on the free surfaces 12 and 15 so as to be perpendicular to each other and the extension thereof is shifted. This is the same as the first embodiment. The destruction procedure is the same as that of the second embodiment, but in the third embodiment of the present invention, in addition to the relationships shown in (1) to (12) of the first embodiment, FIG. As shown in the plan view, the relationship between the distance D, the distance Rd, and the distance Rd ′ between the tips of the thin metal wires 5c on the breaking holes 4a, 4b side is expressed by the following equation (13): D ≦ Rd + Rd ′ (13)
Is set to satisfy
[0051]
From the above equation (13), D ≦ Rd + Rd ′ = 70 + 70 = 140, so D = 100 (cm).
Also by this destruction method, the target portion surrounded by the destruction hole 4a and the destruction hole 4b is destroyed, and the inclination along the line connecting the ends of the metal thin wires 5c on the side of the destruction hole 4a and the destruction hole 4b The fracture surface G1 thus obtained was obtained.
[0052]
In each of the embodiments described above, the destruction container 13A is filled with the destruction substance 13; however, the present invention is not limited to this, and the destruction hole 13 is directly filled with the destruction substance 13 without providing the destruction container 13A. Even if the fine metal wires connected between the electrodes 2 are soaked in the breaking substance 13 so as to be arranged along the depth direction of the breaking hole 4, the same breaking as in the above embodiments can be performed.
[0053]
【The invention's effect】
As is clear from the above description, the present invention sets a destructible region when the metal thin wire melts and evaporates and the destructive substance expands, and the portion to be destroyed of the destruction object is within the destructible region. Since the destruction is performed by setting the distance of the breaking hole from the free surface and the insertion depth of the fine metal wire so as to enter, the object to be destroyed can be destroyed economically and reliably.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing a state in which one destruction probe is inserted into a breaking hole in a breaking method according to a first embodiment of the present invention.
FIG. 2 is a plan view of the same.
FIG. 3 is an overall configuration diagram of the destruction apparatus.
FIG. 4 is a model diagram showing a breakable region.
FIG. 5 is a graph showing the relationship between the stored energy and the breakable region limit.
FIG. 6 is a longitudinal sectional view showing a state in which a breaking probe is inserted into each breaking hole.
FIG. 7 is a plan view of the same.
FIG. 8 is an enlarged cross-sectional view of a state in which three destruction probes are attached to a breaking hole in the second embodiment of the present invention.
FIG. 9 is a perspective view showing a state in which a plurality of destruction holes are formed in the same object to be destroyed.
FIG. 10 is a perspective view of an object to be destroyed, similarly after destruction.
FIG. 11 is a longitudinal sectional view showing a state in which a breaking probe is inserted into each breaking hole in the breaking method according to the third embodiment of the present invention.
FIG. 12 is a plan view of the same.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Destruction device 2 Electrode 3 Destroyed object 4a Destruction hole 5a Metal thin wire 6 Electric energy supply circuit 7 Power supply device 8 Capacitor 10 Charge control circuit 11 Discharge switch 12 Horizontal free surface 13 Destructive substance 13A Destruction container 15 Vertical free surface 40 Destruction Hole group Mf Destructible area P1 Destruction probe Rd Distance to limit of destructible area Lp Metal wire length

Claims

In each free surface of the destructive object having different free surfaces in two directions, a destructive hole for filling the destructive substance that destroys the destructible object by expansion is formed vertically so that the extensions intersect, A thin metal wire connected between the electrodes is placed in each breaking hole along the depth direction of the breaking hole and immersed in the destructive material, and electric energy is applied to the thin metal wire from the charged capacitor via the electrode. By supplying the metal wires in a short time and evaporating and evaporating the metal wires rapidly, the destruction material is vaporized, and the destruction force is destroyed from the metal wires by a predetermined breakable area by the expansion force at that time. When installing a fine metal wire in the hole, the distance Z _o from one free surface to the base end of the fine metal wire placed in the breaking hole and the break from the base end of the fine metal wire to the one free surface side Relation to distance Rd to the limit of possible area But below equation (a) Z _o ≦ Rd (a)
The distance Z _o ′ from the other free surface to the base end of the fine metal wire to be arranged in the breaking hole and the limit of the destructible area from the base end of the fine metal wire to the other free surface side The relationship with the distance Rd ′ up to the following formula (b) Z _o ′ ≦ Rd ′ (b)
Is a destruction method set to satisfy
The relationship between the distance A between the tips of the thin metal wires, the distance Rd and the distance Rd ′ is expressed by the following formula (c): A ≦ Rd + Rd ′ (c)
The distances Rd and Rd ′ from the base end of the thin metal wire to the breakable region limit in the equations (a) to (c) are the electric energy W (J), the energy / breakable region Assuming the conversion coefficient k, the following equation (i)
Rd ≦ (√W) / k (i)
And (i ' )
Rd ′ ≦ (√W) / k (i ′ )
Are set so as to satisfy each of the following, and the electric energy W is expressed by the following equation (j) where the capacitor capacity C (F) for storing electric energy and the charging voltage V (V) are
W = (C × V ² ) / 2 (j)
The destruction method characterized by setting to satisfy .

In each free surface of the destructive object having different free surfaces in two directions, a destructive hole for filling the destructive substance that destroys the destructible object by expansion is formed vertically so that the extensions intersect, each fracture holes, a thin metal wire connected between the electrodes, along the depth direction of the fracture hole and is immersed in the disruption material plurality arranged every predetermined interval, via the electrodes from the charged capacitor By supplying electric energy to the fine metal wire in a short time and rapidly evaporating and evaporating the fine metal wire, the destruction material is vaporized. When a thin metal wire is installed in each hole for destruction, one of the free surface and the distance Z _o from the free surface to the base end of the closest metal thin wire and one from the base end of the metal thin wire Destructible area limit on the free surface side Relationship between the distance Rd to satisfy the following equation (a) Z _o ≦ Rd (a)
The distance Z _o ′ from the other free surface and the free surface to the proximal end of the closest metal wire and the limit of the destructible region on the other free surface side from the proximal end of the metal wire The relationship with the distance Rd ′ is the following formula (b): Z _o ′ ≦ Rd ′
The relationship between the distance A between the tips of the metal wires most distant from each free surface, the distance Rd, and the distance Rd ′ is expressed by the following formula (c): A ≦ Rd + Rd ′ (C)
The distance Z from one free surface to the base end of the thin metal wire farthest from the free surface, the distance Rd, and the number of fine metal wires to be inserted into one breaking hole of the free surface The relationship between N and the length Lp of each metal wire is expressed by the following formula (d): Z ≦ Rd (2 · N−1) + N · Lp (d)
The distance Z ′ from the other free surface to the base end of the metal wire farthest from the free surface, the distance Rd ′, and the metal wire inserted into one breaking hole of the other free surface The relationship between the number M of the metal wires and the length Ld ′ of each metal wire is expressed by the following formula (e): Z ′ ≦ Rd ′ (2 · M−1) + M · Lp ′ (e)
The relationship between the distance Y from the other free surface to the breaking hole formed on one free surface, the distances Rd and Rd ′, the number M of fine metal wires, and the fine metal wire length Lp ′ is as follows: (F) Formula Y ≦ M (2.Rd ′ + Lp ′) + Rd (f)
The relationship between the distance Y ′ from one free surface to the breaking hole formed on the other free surface, the distances Rd and Rd ′, the number M of fine metal wires, and the fine metal wire length Lp is as follows: (G) Formula Y ′ ≦ N (2 · Rd + Lp) + Rd ′ (g)
The distances Rd and Rd ′ from the base end of the thin metal wire to the breakable region limit in the above formulas (a) to (g) are the electric energy W (J) and the energy / breakable region. Assuming the conversion coefficient k, the following equation (i)
Rd ≦ (√W) / k (i)
And (i ' )
Rd ′ ≦ (√W) / k (i ′ )
Are set so as to satisfy each of the following equations, and the electric energy W is expressed by the following equation (j) where the capacitor capacity C (F) for storing electric energy and the charging voltage V (V) are
W = (C × V ² ) / 2 (j)
The destruction method characterized by setting to satisfy .

The destruction method according to claim 1 or 2, wherein a plurality of destruction holes are arranged along each free surface.

On each free surface of the to-be-destructed object having different two-direction free surfaces, a breaking hole for filling a destructive substance that destroys the to-be-destructed object by expansion is formed vertically and its extension is shifted, In each of these breaking holes, a fine metal wire connected between the electrodes is arranged along the depth direction of the breaking hole and immersed in the breaking material, and electric energy is transferred from the charged capacitor to the fine metal wire via the electrode. In a short time, the metal thin wire is rapidly melted and evaporated to vaporize the destructive substance, and the destruction force is destroyed from the metal thin wire by a predetermined destructible area by the expansion force at that time. When a fine metal wire is installed in the breaking hole, the distance Z _o from one free surface to the base end of the fine metal wire to be arranged in the breaking hole and the base end of the fine metal wire on the one free surface side The distance Rd to the destructible area limit and Relationship, the following equation (a) Z _o ≦ Rd (a)
The distance Z _o ′ from the other free surface to the base end of the fine metal wire to be arranged in the breaking hole and the limit of the destructible area from the base end of the fine metal wire to the other free surface side The relationship with the distance Rd ′ up to the following formula (b) Z _o ′ ≦ Rd ′ (b)
In which the relationship between the distance A between the tips of the respective fine metal wires, the distance Rd and the distance Rd ′ is expressed by the following formula (c): A ≦ Rd + Rd ′ (c)
And the relationship between the distance D between the tips of the fine metal wires, the distance Rd, and the distance Rd ′ is expressed by the following formula (h): D ≦ Rd + Rd ′ (h)
The distances Rd and Rd ′ from the base end portion of the fine metal wire to the breakable region limit in the formulas (a) to (c) and (h) are the electric energy W (J), When energy-breakable domain transform coefficient k, the following formula (i)
Rd ≦ (√W) / k (i)
And (i ' )
Rd ′ ≦ (√W) / k (i ′ )
Are set so as to satisfy each of the following equations, and the electric energy W is expressed by the following equation (j) where the capacitor capacity C (F) for storing electric energy and the charging voltage V (V) are
W = (C × V ² ) / 2 (j)
The destruction method characterized by setting to satisfy .

On each free surface of the to-be-destructed object having different two-direction free surfaces, a breaking hole for filling a destructive substance that destroys the to-be-destructed object by expansion is formed vertically and its extension is shifted, In each of these breaking holes, a plurality of fine metal wires connected between the electrodes are arranged at predetermined intervals along the depth direction of the breaking hole and immersed in the breaking substance, and the electrodes are taken from the charged capacitors. The material for destruction is vaporized by supplying electric energy to the fine metal wire in a short time and rapidly evaporating and evaporating the fine metal wire. When the fine metal wires are installed in each of the breaking holes, the distance Z _o between one free surface and the proximal end of the fine metal wire closest to the free surface and the proximal end portion of the fine metal wire Destructible area on one free side Relationship between the distance Rd to the field is, the following equation (a) Z _o ≦ Rd (a)
The distance Z _o ′ from the other free surface and the free surface to the proximal end of the closest metal wire and the limit of the destructible region on the other free surface side from the proximal end of the metal wire The relationship with the distance Rd ′ is the following formula (b): Z _o ′ ≦ Rd ′ (b)
Is a destruction method set to satisfy
The relationship between the distance A between the tips of the thin metal wires, the distance Rd and the distance Rd ′ is expressed by the following formula (c): A ≦ Rd + Rd ′ (c)
The distance Z from one free surface to the tip of the thin metal wire farthest from the free surface, the distance Rd, and the number N of thin metal wires to be inserted into one breaking hole of the free surface And the relationship between the lengths Lp of the thin metal wires is expressed by the following formula (d): Z ≦ Rd (2.N−1) + N · Lp
Of the other free surface and the distance Z ′ from the free surface to the tip of the thin metal wire farthest from the free surface, the distance Rd ′, and the thin metal wire to be inserted into one breaking hole of the other free surface. The relationship between the number M and the length Lp ′ of each metal wire is expressed by the following formula (e): Z ′ ≦ Rd ′ (2 · M−1) + M · Lp ′ (e)
The relationship between the distance Y from the other free surface to the breaking hole formed on one free surface, the distances Rd and Rd ′, the number M of fine metal wires, and the fine metal wire length Lp ′ is as follows: (F) Formula Y ≦ M (2.Rd ′ + Lp ′) + Rd (f)
Set to satisfy
The relationship between the distance Y ′ from one free surface to the breaking hole formed on the other free surface, the distances Rd and Rd ′, the number M of fine metal wires, and the length Lp of the fine metal wires is expressed by the following formula (g): Y ′ ≦ N (2.Rd + Lp) + Rd ′ (g)
And the relationship between the distance D between the tips of the fine metal wires, the distance Rd and the distance Rd ′ is expressed by the following equation (h): D ≦ Rd + Rd ′ (h)
And the distances Rd and Rd ′ from the base end of the fine metal wire to the breakable region limit in the equations (a) to (h) are the electric energy W (J) and the energy / breakable region. Assuming the conversion coefficient k, the following equation (i)
Rd ≦ (√W) / k (i)
And (i ' )
Rd ′ ≦ (√W) / k (i ′ )
Are set so as to satisfy each of the following, and the electric energy W is expressed by the following equation (j) where the capacitor capacity C (F) for storing electric energy and the charging voltage V (V) are
W = (C × V ² ) / 2 (j)
The destruction method characterized by setting to satisfy .

The destruction method according to claim 4 or 5, wherein a plurality of destruction holes are arranged along each free surface.