{"id":22911,"date":"2026-07-12T17:34:20","date_gmt":"2026-07-12T17:34:20","guid":{"rendered":"https:\/\/infos-media-nantes.fr\/?p=22911"},"modified":"2026-09-23T07:55:19","modified_gmt":"2026-09-23T07:55:19","slug":"forme-joubert-saint-nazaire-porte-devasage","status":"publish","type":"post","link":"https:\/\/infos-media-nantes.fr\/forme-joubert-saint-nazaire-porte-devasage\/","title":{"rendered":"Saint-Nazaire : la nouvelle porte de la forme Joubert prend forme, le d\u00e9vasage se poursuit"},"content":{"rendered":"<article>\n<p><strong>Mise \u00e0 jour du 23 septembre 2026.<\/strong> Le chantier de remplacement de la porte amont de la forme Joubert franchit une nouvelle \u00e9tape \u00e0 Saint-Nazaire. Nantes Saint-Nazaire Port indique qu&#8217;une trentaine des 46 blocs de la future porte sont d\u00e9sormais assembl\u00e9s dans la forme de radoub n\u00b03. En parall\u00e8le, les op\u00e9rations de d\u00e9vasage se poursuivent autour de la porte actuelle et dans le bassin de Penho\u00ebt.<\/p>\n<h2>Une trentaine de blocs d\u00e9j\u00e0 assembl\u00e9s<\/h2>\n<p>La future porte amont prend progressivement forme. Jusqu&#8217;au printemps 2027, la forme de radoub n\u00b03 est mobilis\u00e9e pour assembler 46 blocs et 16 tubes pr\u00e9fabriqu\u00e9s par l&#8217;entreprise MATIERE dans plusieurs usines fran\u00e7aises et belges.<\/p>\n<p>Selon le point d&#8217;avancement publi\u00e9 le 22 septembre par Nantes Saint-Nazaire Port, une trentaine de blocs sont d\u00e9j\u00e0 assembl\u00e9s. Apr\u00e8s les op\u00e9rations de soudure, la prochaine grande \u00e9tape sera l&#8217;application des protections anticorrosion. Le d\u00e9but des travaux de peinture est annonc\u00e9 pour la mi-octobre.<\/p>\n<p>Une fois l&#8217;ensemble finalis\u00e9, la nouvelle porte sera mise en flottaison dans la forme de radoub, puis convoy\u00e9e jusqu&#8217;\u00e0 la forme-\u00e9cluse Joubert. Elle y patientera avant son installation d\u00e9finitive.<\/p>\n<h2>Le d\u00e9vasage pr\u00e9pare le retrait de l&#8217;ancienne porte<\/h2>\n<p>Depuis le mois d&#8217;ao\u00fbt, l&#8217;entreprise Charier m\u00e8ne \u00e9galement des op\u00e9rations de d\u00e9vasage dans la porte, dans son enclave et \u00e0 proximit\u00e9 imm\u00e9diate du bassin de Penho\u00ebt.<\/p>\n<p>Ces travaux doivent pr\u00e9parer la remise en flottaison de l&#8217;ancienne porte, son futur d\u00e9mant\u00e8lement et l&#8217;arriv\u00e9e de la nouvelle structure. Les s\u00e9diments retir\u00e9s sont trait\u00e9s puis stock\u00e9s temporairement dans des g\u00e9otubes afin de les ass\u00e9cher avant leur \u00e9vacuation vers une installation adapt\u00e9e.<\/p>\n<p>Le port pr\u00e9cise que ces op\u00e9rations sont encadr\u00e9es au titre de la r\u00e9glementation sur l&#8217;eau et sont organis\u00e9es par \u00e9tapes pour limiter les contraintes sur l&#8217;exploitation du site.<\/p>\n<h2>Un chantier \u00e0 40 millions d&#8217;euros jusqu&#8217;en 2029<\/h2>\n<p>Install\u00e9e en 1947, la porte amont actuelle pr\u00e9sente aujourd&#8217;hui un niveau de d\u00e9gradation qui impose son remplacement. L&#8217;op\u00e9ration, valid\u00e9e par le conseil de surveillance du Grand Port maritime, repr\u00e9sente un investissement de 40 millions d&#8217;euros.<\/p>\n<p>Le chantier a d\u00e9but\u00e9 au printemps 2026 et doit s&#8217;achever au d\u00e9but de l&#8217;ann\u00e9e 2029. Il vise \u00e0 fiabiliser la forme Joubert, utilis\u00e9e \u00e0 la fois comme \u00e9cluse d&#8217;acc\u00e8s au bassin de Penho\u00ebt et comme forme de radoub pour accueillir de grands navires.<\/p>\n<h2>Une infrastructure strat\u00e9gique pour Saint-Nazaire<\/h2>\n<p>La forme Joubert occupe une place centrale dans l&#8217;activit\u00e9 portuaire et industrielle de Saint-Nazaire. Ses dimensions permettent d&#8217;accueillir des b\u00e2timents de la Marine nationale, des paquebots construits aux Chantiers de l&#8217;Atlantique ainsi que des op\u00e9rations li\u00e9es \u00e0 l&#8217;\u00e9olien en mer.<\/p>\n<p>La porte sert aussi de voie de circulation sur le site portuaire. Les travaux doivent donc concilier modernisation de l&#8217;ouvrage, maintien des activit\u00e9s maritimes et d\u00e9placements terrestres.<\/p>\n<p>Pour suivre l&#8217;avancement du chantier, Nantes Saint-Nazaire Port publie r\u00e9guli\u00e8rement des informations sur <a href=\"https:\/\/www.nantes.port.fr\/fr\/travaux-de-la-porte-amont-de-la-forme-joubert-saint-nazaire\" target=\"_blank\" rel=\"noopener noreferrer\" style=\"color:#5532F0\"><strong><u>sa page d\u00e9di\u00e9e aux travaux de la forme Joubert<\/u><\/strong><\/a>.<\/p>\n<p style=\"font-size:12px;color:#666\">Source : Nantes Saint-Nazaire Port, points d&#8217;avancement publi\u00e9s le 22 septembre 2026.<\/p>\n<\/article>\n","protected":false},"excerpt":{"rendered":"<p>\u00c0 Saint-Nazaire, une trentaine des 46 blocs de la future porte amont de la forme Joubert sont assembl\u00e9s. Le d\u00e9vasage pr\u00e9pare aussi le retrait de l\u2019ancienne porte.<\/p>\n","protected":false},"author":1,"featured_media":22912,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"content-type":"","footnotes":"","event_start_date":"","event_end_date":"","event_location":"","imn_event_city":"","imn_event_start_time":"","imn_event_end_time":"","imn_event_all_day":"","imn_event_address":"","imn_event_ticket_url":"","imn_event_price":"","imn_event_status":"","imn_event_organizer":"","imn_event_accessibility":""},"categories":[22],"tags":[8484,8486,6687,7,1276,8485,166],"class_list":["post-22911","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualites-nantes","tag-chantier-portuaire","tag-devasage","tag-forme-joubert","tag-loire-atlantique","tag-nantes-saint-nazaire-port","tag-porte-amont","tag-saint-nazaire"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.8 - 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