{"id":1317,"date":"2013-10-12T20:46:04","date_gmt":"2013-10-12T19:46:04","guid":{"rendered":"http:\/\/mdemierre.speleologie.ch\/?p=1317"},"modified":"2026-05-14T16:04:13","modified_gmt":"2026-05-14T15:04:13","slug":"microblasting","status":"publish","type":"post","link":"https:\/\/www.techt.ch\/mdemierre\/?p=1317","title":{"rendered":"Microblasting"},"content":{"rendered":"<p>Le microblasting (microtir) est une des techniques les plus ad\u00e9quates en milieu confin\u00e9, par exemple pour la sp\u00e9l\u00e9ologie.<\/p>\n<p><span style=\"text-decoration: underline;\">Technique :<\/span><\/p>\n<ul>\n<li>Charge for\u00e9e.<\/li>\n<li>Forage de diam\u00e8tre 8 mm, longueur typ. 400 (max. 550 mm). Convient particuli\u00e8rement avec les perforateurs \u00e0 accumulateurs !<\/li>\n<li>Charge en cordeau d\u00e9tonant 24 g\/m.<\/li>\n<li>Amorce enti\u00e8rement dans le forage, en charge allumette (amorce et charge bout-\u00e0-bout).<\/li>\n<li>Avancement typique dans du calcaire de 20 \u00e0 30 cm.<\/li>\n<\/ul>\n<p><span style=\"text-decoration: underline;\">Les explosifs :<\/span><\/p>\n<p>Cordeau d\u00e9tonnant Detonex 24 g\/m :<\/p>\n<ul>\n<li>Diam\u00e8tre ext. 6.1 mm<\/li>\n<li>Vitesse env. 7000 m\/s (tr\u00e8s brisant)<\/li>\n<li>Volume de gaz : 770 l\/kg<\/li>\n<li>Bilan oxyg\u00e8ne : \u2013 10.1 % (!)<\/li>\n<\/ul>\n<p>Amorce \u00e9lectrique HU :<\/p>\n<ul>\n<li>Diam\u00e8tre ext. 7.5 mm<\/li>\n<\/ul>\n<p><span style=\"text-decoration: underline;\">Avantages :<\/span><\/p>\n<ul>\n<li>Diminution de la production de gaz toxiques.<\/li>\n<li>Diminution du bruit (pas de cordeau ext\u00e9rieur).<\/li>\n<li>Diminution des projections et des \u00e9branlements.<\/li>\n<li>Le bourrage n\u2019est pas obligatoire et la mise en oeuvre est rapide.<\/li>\n<\/ul>\n<p>Une vid\u00e9o montrant la mise en oeuvre du microblasting en sp\u00e9l\u00e9ologie :<\/p>\n<div class=\"ast-oembed-container \" style=\"height: 100%;\"><iframe loading=\"lazy\" title=\"minage en sp\u00e9l\u00e9ologie\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/_vTQiAr5XLI?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/div>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Le microblasting (microtir) est une des techniques les plus ad\u00e9quates en milieu confin\u00e9, par exemple pour la sp\u00e9l\u00e9ologie. Technique : [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":1318,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ngg_post_thumbnail":0,"footnotes":""},"categories":[3,80,2],"tags":[27,41,19,46],"class_list":["post-1317","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-explosifs","category-technique-speleologie","category-technique","tag-explosifs-2","tag-minage","tag-speleologie-2","tag-travaux-souterrains-2"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.0.1 - aioseo.com -->\n\t<meta name=\"description\" content=\"Le microblasting (microtir) est une des techniques les plus ad\u00e9quates en milieu confin\u00e9, par exemple pour la sp\u00e9l\u00e9ologie. Technique : Charge for\u00e9e. Forage de diam\u00e8tre 8 mm, longueur typ. 400 (max. 550 mm). Convient particuli\u00e8rement avec les perforateurs \u00e0 accumulateurs ! Charge en cordeau d\u00e9tonant 24 g\/m. 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