{"id":952,"date":"2014-04-18T13:50:05","date_gmt":"2014-04-18T12:50:05","guid":{"rendered":"http:\/\/arwann.com\/?page_id=952"},"modified":"2015-05-08T11:09:21","modified_gmt":"2015-05-08T10:09:21","slug":"rappel","status":"publish","type":"page","link":"http:\/\/arwann.com\/?page_id=952","title":{"rendered":"Le rappel"},"content":{"rendered":"

\"boutonpar Lama. \u00a0 Le coin des scouts<\/a> -> N\u0153uds et cordages<\/a><\/p>\n

Et voil\u00e0 les douze n\u0153uds de base<\/a> sont connus. Voyons un exemple pratique qui utilise des n\u0153uds: le rappel.<\/p>\n

Au fait pourquoi cela s’appelle-t-il rappel ? Simple, les alpinistes apr\u00e8s avoir escalad\u00e9 ne s’amusaient pas \u00e0 d\u00e9-escalader pour descendre (d’abord c’est quasi impossible). Ils descendent \u00e0 l’aide du rappel. Mais la corde qu’ils utilisent, il faut pouvoir la rappeler depuis le bas, d’o\u00f9 la mise en double de la corde. Il suffit de tirer sur un bout pour la r\u00e9cup\u00e9rer.<\/p>\n

Pour la corde d’assurance on peut utiliser le n\u0153ud de chaise mais pour une s\u00e9curit\u00e9 absolue il est recommand\u00e9 d’utiliser le n\u0153ud de huit en chaise car dans certains cas, si le n\u0153ud de chaise n’a pas \u00e9t\u00e9 serr\u00e9 suffisamment, il risque de se d\u00e9faire (\u00e7a a d\u00fb arriver une fois quelque part alors on ne recommence plus). Ce n\u0153ud se construit de mani\u00e8re plus laborieuse que le n\u0153ud de chaise mais il est tr\u00e8s s\u00fbr m\u00eame s’il n’est pas serr\u00e9.<\/p>\n

\"huit<\/a><\/p>\n

Lorsqu’on fait du rappel il ne faut pas l\u00e9siner sur la s\u00e9curit\u00e9. Il faut pr\u00e9voir un deuxi\u00e8me ancrage au cas o\u00f9 le premier l\u00e2chait. Ensuite, sur le bord de la falaise on peut rajouter une main courante pour pouvoir s’y accrocher,<\/p>\n

\"rappel2\"<\/a>Enfin le n\u0153ud (ou la technique) de freinage, celui qui assure la retenue du corps le long de la corde de rappel. Pour cette retenue on utilise simplement le frottement de la corde sur un anneau m\u00e9tallique en forme de huit. Le frottement occasionn\u00e9 pendant la descente se transforme en chaleur qui se r\u00e9partit le long de la corde de rappel et qui se concentre dans l’anneau en huit. Si on descend assez vite l’anneau est vraiment chaud. Gr\u00e2ce \u00e0 ce frottement qui travaille avec le poids du corps on peut facilement contr\u00f4ler sa vitesse, une force infime en sortie de l’anneau permet de bloquer la descente. On dit que le frottement amplifie cette force de contr\u00f4le (pour les matheux, qu’ils sachent que c’est de mani\u00e8re exponentielle).<\/p>\n

\"Rappel-1\"<\/a><\/p>\n

R\u00e9ponse \u00e0 la question pour les champions en topographie :<\/span><\/h4>\n

Qu’est-ce donc un b\u00e9lier ? Un b\u00e9lier est un b\u00e9lier hydraulique; C’est un syst\u00e8me tr\u00e8s ing\u00e9nieux invent\u00e9 par un des fr\u00e8res Montgolfier et son p\u00e8re qui utilise la force intrins\u00e8que d’un \u00e9coulement d’eau pour remonter l’eau bien au-dessus de son cours. il n’y a qu’une seule pi\u00e8ce mobile, un clapet qui bat et qui en se fermant brusquement provoque des\u00a0\u00bb coups de b\u00e9lier\u00a0\u00bb (cognement brutal de l’eau dans les tuyaux). cette surpression est utilis\u00e9e pour remonter l’eau assez haut. ce syst\u00e8me marche jour et nuit pendant facilement 1\/2 si\u00e8cle avec un rendement extraordinaire pour l’\u00e9poque, 70%. Sur le terrain on devrait trouver un sorte de bassin prolong\u00e9 par un long tuyau en fonte qui part dans la pente sur une ou plusieurs dizaines de m\u00e8tres. le fameux clapet est au bout de ce tuyau et c’est l\u00e0 le d\u00e9part de la canalisation qui remonte l’eau.<\/p>\n

page pr\u00e9c\u00e9dente : les n\u0153uds de base
\n<\/a>page suivante : frapper un br\u00ealage<\/a><\/em><\/p>\n","protected":false},"excerpt":{"rendered":"

par Lama. \u00a0 Le coin des scouts -> N\u0153uds et cordages Et voil\u00e0 les douze n\u0153uds de base sont connus. Voyons un exemple pratique qui utilise des n\u0153uds: le rappel. Au fait pourquoi cela s’appelle-t-il rappel ? Simple, les alpinistes apr\u00e8s avoir escalad\u00e9 ne s’amusaient pas \u00e0 d\u00e9-escalader pour descendre (d’abord c’est quasi impossible). Ils … Continuer la lecture de Le rappel<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"parent":320,"menu_order":0,"comment_status":"open","ping_status":"open","template":"","meta":{"footnotes":""},"class_list":["post-952","page","type-page","status-publish","hentry"],"yoast_head":"\nLe rappel -<\/title>\n<meta name=\"description\" content=\"le rappel au scout\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"http:\/\/arwann.com\/?page_id=952\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Le rappel -\" \/>\n<meta property=\"og:description\" content=\"le rappel au scout\" \/>\n<meta property=\"og:url\" content=\"http:\/\/arwann.com\/?page_id=952\" \/>\n<meta property=\"article:modified_time\" content=\"2015-05-08T10:09:21+00:00\" \/>\n<meta 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