{"id":26416,"date":"2026-11-06T17:00:04","date_gmt":"2026-11-06T16:00:04","guid":{"rendered":"https:\/\/www.weissappetito.com\/?post_type=einblicke&p=26416"},"modified":"2026-11-03T13:42:56","modified_gmt":"2026-11-03T12:42:56","slug":"bohrkopf-revision-am-gotthard-120-stahlplatten-in-fuenf-wochen-erneuert","status":"publish","type":"einblicke","link":"https:\/\/www.weissappetito.com\/fr\/einblicke\/bohrkopf-revision-am-gotthard\/","title":{"rendered":"R\u00e9vision du tron\u00e7on de la route du Gotthard : 120 plaques d'acier remises \u00e0 neuf en cinq semaines"},"content":{"rendered":"

La deuxi\u00e8me tubule du tunnel ferroviaire du Gotthard est construite sur commande du gouvernement suisse. Agence f\u00e9d\u00e9rale des routes ASTRA<\/a> entra\u00een\u00e9s par les deux c\u00f4t\u00e9s. <\/strong>Alors que la machine de forage \u00ab Paulina \u00bb de Airolo travaille dans les entrailles de la montagne, les roches laissent des traces marqu\u00e9es sur le disque de coupe. Les plaques de protection contre l\u2019usure situ\u00e9es \u00e0 c\u00f4t\u00e9 des rouleaux de coupe sont \u00e9galement fortement sollicit\u00e9es. Un \u00e9quipe de trois personnes de la soci\u00e9t\u00e9 Josef Muff AG a travaill\u00e9 pendant cinq semaines pour remplacer ces \u00e9l\u00e9ments. Au total, 120 plaques de protection affil\u00e9es ou bris\u00e9es ont \u00e9t\u00e9 retir\u00e9es et remplac\u00e9es par de nouvelles. Les travaux ont eu lieu entre 03h00 du matin et 12h00 du midi. Apr\u00e8s cela, la machine devait \u00eatre de nouveau op\u00e9rationnelle pour poursuivre le travail.<\/strong><\/p>\n

Une machine de forage de tunnel d'un diam\u00e8tre de 12,31 m\u00e8tres<\/h2>\n

La deuxi\u00e8me tubule du tunnel du Gotthard est entra\u00een\u00e9e vers l\u2019avant depuis les deux c\u00f4t\u00e9s. Au sud, la machine de forage \u00ab Paulina \u00bb du constructeur allemand Herrenknecht est mise en \u0153uvre pour ce travail. Cette TBM \u00e0 deux plaques de guidage mesure environ 110 m\u00e8tres de long, p\u00e8se 2\u2019118 tonnes et dispose d\u2019une puissance de traction de 5\u2019600 kW. Son plaque frontale mesure 12,31 m\u00e8tres de diam\u00e8tre.<\/p>\n

Une section de tunnel sud est pr\u00e9vue d\u2019une longueur de 7\u2019750 m\u00e8tres environ.<\/p>\n

Au niveau de la face avant de la machine, on trouve le disque de coupe avec les rouleaux de coupe qui y sont dispos\u00e9s. Pendant que le disque tourne, ces derniers sont press\u00e9s avec une force consid\u00e9rable contre le rocher et fracturent le sol. Les \u00e9l\u00e9ments m\u00e9talliques environnants sont eux aussi soumis \u00e0 de fortes contraintes.<\/p>\n

Pour prot\u00e9ger le disque de coupe contre l\u2019abrasion caus\u00e9e par le sol, des plaques de protection contre l\u2019usure ont \u00e9t\u00e9 install\u00e9es entre les rouleaux de coupe. Sur la \u00ab Paulina \u00bb, de nombreuses de ces plaques \u00e9taient d\u00e9j\u00e0 fortement us\u00e9es ou avaient partiellement c\u00e9d\u00e9. Au total, 120 pi\u00e8ces ont d\u00fb \u00eatre remplac\u00e9es.<\/p>\n

120 plaques de protection contre l'usure sur le disque de coupe sont remplac\u00e9es<\/h2>\n

L\u2019\u00e9change s\u2019est effectu\u00e9 directement \u00e0 l\u2019avant du disque de coupe. Les superviseurs de Herrenknecht ont d\u00e9termin\u00e9 sur place quels plaques devaient \u00eatre remplac\u00e9es et dans quelles positions les nouveaux \u00e9l\u00e9ments devaient \u00eatre mont\u00e9s. Le d\u00e9roulement des travaux a \u00e9galement \u00e9t\u00e9 adapt\u00e9 en fonction de leurs conseils.<\/p>\n

L\u2019\u00e9quipe de trois personnes de Josef Muff AG \u00e9tait compos\u00e9e de deux soudeurs et d\u2019un autre employ\u00e9 qui assurait les travaux pr\u00e9paratoires.<\/p>\n

Premi\u00e8rement, les plaques de protection existantes devaient \u00eatre enlev\u00e9es. Pour cela, le proc\u00e9d\u00e9 Arc-Air a \u00e9t\u00e9 utilis\u00e9, consistant \u00e0 extraire le mat\u00e9riau \u00e0 l\u2019aide d\u2019un faisceau lumineux et d\u2019air comprim\u00e9. Par la suite, les zones d\u00e9gag\u00e9es ont \u00e9t\u00e9 nettoy\u00e9es et pr\u00e9par\u00e9es pour l\u2019installation des plaques de remplacement.<\/p>\n

Les nouvelles plaques de protection contre l\u2019usure \u00e9taient d\u2019une \u00e9paisseur de 25 millim\u00e8tres et composaient deux couches. Le mat\u00e9riau de base \u00e9tait de l\u2019acier de qualit\u00e9 S355, sur lequel se trouvait une couche de protection contre l\u2019usure dure. Le corps principal du disque de coupe lui-m\u00eame est en acier S355 de 90 millim\u00e8tres d\u2019\u00e9paisseur dans la zone trait\u00e9e.<\/p>\n

Apr\u00e8s la pr\u00e9paration, les nouvelles plaques ont \u00e9t\u00e9 align\u00e9es selon les consignes de Herrenknecht et, d\u2019abord coll\u00e9es, puis enti\u00e8rement soud\u00e9es.<\/p>\n

Travaux de soudage dans des conditions exceptionnelles<\/h2>\n

Pour l\u2019assemblage, les deux soudeurs ont utilis\u00e9 la technique de soudage MAG 136 avec fil de soudage. Cette technique s\u2019adaptait particuli\u00e8rement aux assemblages de position requises. Comme une partie des coutures de soudage devait \u00eatre r\u00e9alis\u00e9e \u00e0 la hausse ou en t\u00eate de tube, l\u2019effet de soutien du fil de soudage \u00e9tait avantageux pour le bain de soudage.<\/p>\n

Les conditions de travail sur le chariot de d\u00e9coupe ont exig\u00e9 beaucoup de patience de l\u2019\u00e9quipe. Bien que le chariot de d\u00e9coupe ait une dimension de plus de douze m\u00e8tres, l\u2019espace entre les diff\u00e9rentes pi\u00e8ces \u00e9tait tr\u00e8s limit\u00e9. Les deux soudeurs devaient parfois travailler debout ou couch\u00e9s pour atteindre les zones pr\u00e9vues.<\/p>\n

De plus, il y avait de la boue au sol, il n\u2019y avait pas de lumi\u00e8re naturelle et l\u2019activit\u00e9 de soudage g\u00e9n\u00e9rait de l\u2019\u00e9mission de fum\u00e9e. C\u2019est pourquoi la ventilation du lieu de travail devait \u00eatre renforc\u00e9e.<\/p>\n

Le transport jusqu\u2019au lieu de travail faisait \u00e9galement partie de l\u2019activit\u00e9 quotidienne. \u00c0 l\u2019\u00e9poque de la r\u00e9vision, la machine \u00e0 creuser les tunnels \u00ab Paulina \u00bb se trouvait d\u00e9j\u00e0 \u00e0 environ 300 m\u00e8tres au-dessus du sol. Le trajet jusqu\u2019au rotor de coupe dura environ 20 minutes. Les outils et le mat\u00e9riel n\u00e9cessaires \u00e9taient transport\u00e9s \u00e0 l\u2019aide d\u2019une machine de chantier.<\/p>\n

Apr\u00e8s la r\u00e9vision, le progr\u00e8s a continu\u00e9.<\/h2>\n

Outre les exigences techniques, c\u2019\u00e9tait surtout le rythme de travail qui \u00e9tait dict\u00e9 par le travail en cours dans le tunnel. Pendant cinq semaines, le travail de l\u2019\u00e9quipe de Josef Muff AG commen\u00e7ait \u00e0 03h00 du matin chaque nuit.<\/p>\n

D\u00e8s 12h00, les travaux quotidiens pr\u00e9vus devaient \u00eatre termin\u00e9s. Apr\u00e8s cela, le disque de coupe devait \u00eatre de nouveau utilis\u00e9 pour le forage.<\/p>\n

Pour permettre la r\u00e9alisation des prochaines plaques, le disque de coupe a \u00e9t\u00e9 d\u00e9plac\u00e9 en cons\u00e9quence. Les travaux se sont donc orient\u00e9s en fonction des positions disponibles \u00e0 chaque moment et du temps quotidien disponible.<\/p>\n

Pour chaque soudeur, environ six plaques de protection pouvaient \u00eatre trait\u00e9es par couche. Pendant que les deux soudeurs s\u2019occupaient de la d\u00e9coupe et de la soudure, le troisi\u00e8me collaborateur s\u2019occupait de la pr\u00e9paration.<\/p>\n

Les horaires de travail inhabituels \u00e9taient \u00e9galement exigeants sur le plan physique. L\u2019heure de d\u00e9part du travail pr\u00e9coce et la fatigue qui en d\u00e9coulaient s\u2019ajoutaient aux conditions de travail restreintes. En m\u00eame temps, l\u2019\u00e9quipe devait r\u00e9partir ses travaux de mani\u00e8re \u00e0 permettre la reprise du travail de forage pr\u00e9vu \u00e0 midi.<\/p>\n

Cinq semaines au c\u0153ur du travail de la \u00ab Paulina \u00bb<\/h2>\n

Entre ao\u00fbt et septembre 2026, Josef Muff AG a renouvel\u00e9 les 120 plaques de protection contre l\u2019usure sur la machine de forage \u00ab Paulina \u00bb \u00e0 Airolo, pour le compte de Marti Tunnelbau AG et de l\u2019Office f\u00e9d\u00e9ral des routes (ASTRA).<\/p>\n

Les travaux ont \u00e9t\u00e9 r\u00e9alis\u00e9s en \u00e9troite coordination avec les superviseurs du constructeur d\u2019engins Herrenknecht, qui ont d\u00e9fini la position des composants et le d\u00e9roulement des op\u00e9rations.<\/p>\n

Pour l'\u00e9quipe de trois personnes, ce travail a repr\u00e9sent\u00e9 cinq semaines de travail atypique, des positions de travail exigeantes sur le plan physique et un calendrier pr\u00e9cis. Gr\u00e2ce aux nouvelles plaques de protection, le disque de coupe a pu poursuivre son utilisation dans le tunnel du Gotthard.<\/p>\n

Plus d'informations sur la machine de forage \u00abPaulina\u00bb et la construction de la deuxi\u00e8me conduite sont disponibles sur site web officiel du bureau f\u00e9d\u00e9ral des routes ASTRA<\/a> \u00e0 trouver.<\/p>","protected":false},"featured_media":26493,"parent":0,"template":"","categories":[28],"tags":[],"class_list":["post-26416","einblicke","type-einblicke","status-publish","has-post-thumbnail","hentry","category-rohrleitungsbau"],"acf":{"photo_gallery":{"projektfotos":[[{"id":26493,"title":"JMAG_Revision_Tunnelbohrkopf_Gotthard_39_Einblick","caption":"","full_image_url":"https:\/\/www.weissappetito.com\/wp-content\/uploads\/2026\/11\/JMAG_Revision_Tunnelbohrkopf_Gotthard_39_Einblick.jpg","thumbnail_image_url":"https:\/\/www.weissappetito.com\/wp-content\/uploads\/2026\/11\/JMAG_Revision_Tunnelbohrkopf_Gotthard_39_Einblick-150x150.jpg","large_srcset":"https:\/\/www.weissappetito.com\/wp-content\/uploads\/2026\/11\/JMAG_Revision_Tunnelbohrkopf_Gotthard_39_Einblick-600x400.jpg 600w, https:\/\/www.weissappetito.com\/wp-content\/uploads\/2026\/11\/JMAG_Revision_Tunnelbohrkopf_Gotthard_39_Einblick-300x200.jpg 300w, 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