{"id":3338,"date":"2021-04-25T07:23:59","date_gmt":"2021-04-25T07:23:59","guid":{"rendered":"http:\/\/tunnelingworld.com\/?p=3338"},"modified":"2021-04-25T07:23:59","modified_gmt":"2021-04-25T07:23:59","slug":"brenner-base-tunnel-breakthrough-of-first-main-tunnel-below-the-isarco-river","status":"publish","type":"post","link":"https:\/\/tunnelingworld.com\/?p=3338","title":{"rendered":"Brenner Base Tunnel: Breakthrough of first main tunnel below the Isarco river"},"content":{"rendered":"<p style=\"text-align: justify;\">The excavation of this part was started on 19 April 2021, when the construction had been started almost one month ago. The construction activities were commenced in the beneath of the Isarco river for the future Brenner Base Tunnel railway. Excavation under the river was only possible after freezing the soil with liquid nitrogen and then maintaining low temperatures by circulating brine.<\/p>\n<p style=\"text-align: justify;\">The digging process was done using a percussion hammer that has meanly 1.5 m advancement per day. The next phase of the work after finishing the excavation stage, will be the final concrete lining of the tunnel. By utilizing the soil consolidation method one of the other tunnels was broke through during 2020, while two other tunnels are yet to be dug using the same method. Click <a href=\"http:\/\/tunnelingworld.com\/project-show-case\/brenner-bt-research-can-boost-tunnel-stability\/%20\">here<\/a> for tunnelingworld archive and also visit this <a href=\"https:\/\/www.bbt-se.com\/en\">website<\/a> for more information.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The excavation of this part was started on 19 April 2021, when the construction had been started almost one month ago. The construction activities were commenced in the beneath of the Isarco river for the future Brenner Base Tunnel railway. Excavation under the river was only possible after freezing the soil with liquid nitrogen and then maintaining low temperatures by circulating brine. The digging process was done using a percussion hammer that has meanly 1.5 m advancement per day. The next phase of the work after finishing the excavation stage, will be the final concrete lining of the tunnel. By [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":3339,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[40],"tags":[373,374,375,321],"class_list":["post-3338","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-features","tag-austria","tag-brenner-base-tunnel","tag-isarco-river","tag-tunnelling","post--single"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Brenner Base Tunnel: Breakthrough of first main tunnel below the Isarco river<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/tunnelingworld.com\/?p=3338\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Brenner Base Tunnel: Breakthrough of first main tunnel below the Isarco river\" \/>\n<meta property=\"og:description\" content=\"The excavation of this part was started on 19 April 2021, when the construction had been started almost one month ago. The construction activities were commenced in the beneath of the Isarco river for the future Brenner Base Tunnel railway. Excavation under the river was only possible after freezing the soil with liquid nitrogen and then maintaining low temperatures by circulating brine. The digging process was done using a percussion hammer that has meanly 1.5 m advancement per day. The next phase of the work after finishing the excavation stage, will be the final concrete lining of the tunnel. 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The construction activities were commenced in the beneath of the Isarco river for the future Brenner Base Tunnel railway. Excavation under the river was only possible after freezing the soil with liquid nitrogen and then maintaining low temperatures by circulating brine. The digging process was done using a percussion hammer that has meanly 1.5 m advancement per day. The next phase of the work after finishing the excavation stage, will be the final concrete lining of the tunnel. 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