{"id":157792,"date":"2025-12-09T11:33:58","date_gmt":"2025-12-09T11:33:58","guid":{"rendered":"https:\/\/www.pbctoday.co.uk\/news\/?p=157792"},"modified":"2025-12-09T11:33:58","modified_gmt":"2025-12-09T11:33:58","slug":"work-moves-forward-hs2s-longest-green-tunnel","status":"publish","type":"post","link":"https:\/\/www.pbctoday.co.uk\/news\/projects\/work-moves-forward-hs2s-longest-green-tunnel\/157792\/","title":{"rendered":"Work moves forward on HS2\u2019s longest green tunnel"},"content":{"rendered":"<h2>The realignment of the B4525 allows the excavation of the Greatworth tunnel, HS2\u2019s longest cut-and-cover tunnel, to continue at pace<\/h2>\n<p>The tunnel will stretch for 2.7km, making this <a href=\"https:\/\/www.hs2.org.uk\/\" target=\"_blank\" rel=\"noopener\">HS2\u2019s<\/a> longest green tunnel, created using the \u2018cut-and-cover\u2019 method, which places soil back on top of the tunnel to blend it into the surrounding countryside.<\/p>\n<p>The first kilometre of the tunnel has already been assembled, and work can now start on the next stage.<\/p>\n<h3>The tunnel uses offsite construction techniques<\/h3>\n<p>Sections of the tunnel are pre-built in concrete segments, making the tunnel into the shape of an \u2018M\u2019 with separate halves for north- and southbound trains.<\/p>\n<p>The construction of this tunnel is taking lessons from similar structures used in the French high-speed train network, but also from the nearby Chipping Warden tunnel, which, while shorter, has used similar construction methods.<\/p>\n<figure id=\"attachment_157793\" aria-describedby=\"caption-attachment-157793\" style=\"width: 2000px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-157793\" src=\"https:\/\/www.pbctoday.co.uk\/news\/wp-content\/uploads\/2025\/12\/The-realigned-B4525-near-Greatworth-scaled.jpg\" alt=\"The realigned B4525 near Greatworth tunnel, HS2's longest green tunnel\" width=\"2000\" height=\"1125\" srcset=\"https:\/\/www.pbctoday.co.uk\/news\/wp-content\/uploads\/2025\/12\/The-realigned-B4525-near-Greatworth-scaled.jpg 2000w, https:\/\/www.pbctoday.co.uk\/news\/wp-content\/uploads\/2025\/12\/The-realigned-B4525-near-Greatworth-300x169.jpg 300w, https:\/\/www.pbctoday.co.uk\/news\/wp-content\/uploads\/2025\/12\/The-realigned-B4525-near-Greatworth-1024x576.jpg 1024w, https:\/\/www.pbctoday.co.uk\/news\/wp-content\/uploads\/2025\/12\/The-realigned-B4525-near-Greatworth-768x432.jpg 768w, https:\/\/www.pbctoday.co.uk\/news\/wp-content\/uploads\/2025\/12\/The-realigned-B4525-near-Greatworth-1536x864.jpg 1536w, https:\/\/www.pbctoday.co.uk\/news\/wp-content\/uploads\/2025\/12\/The-realigned-B4525-near-Greatworth-2048x1152.jpg 2048w, https:\/\/www.pbctoday.co.uk\/news\/wp-content\/uploads\/2025\/12\/The-realigned-B4525-near-Greatworth-747x420.jpg 747w, https:\/\/www.pbctoday.co.uk\/news\/wp-content\/uploads\/2025\/12\/The-realigned-B4525-near-Greatworth-696x392.jpg 696w, https:\/\/www.pbctoday.co.uk\/news\/wp-content\/uploads\/2025\/12\/The-realigned-B4525-near-Greatworth-1068x601.jpg 1068w, https:\/\/www.pbctoday.co.uk\/news\/wp-content\/uploads\/2025\/12\/The-realigned-B4525-near-Greatworth-1920x1080.jpg 1920w, https:\/\/www.pbctoday.co.uk\/news\/wp-content\/uploads\/2025\/12\/The-realigned-B4525-near-Greatworth-610x343.jpg 610w\" sizes=\"auto, (max-width: 2000px) 100vw, 2000px\" \/><figcaption id=\"caption-attachment-157793\" class=\"wp-caption-text\">Image: \u00a9HS2 Ltd<\/figcaption><\/figure>\n<p>The tunnels at Greatworth and Chipping Warden are both installing five or six concrete segments per day.<\/p>\n<p>HS2 Ltd\u2019s project manager, Sam Arrowsmith, said: \u201cI\u2019m really pleased to see the temporary realignment of the B4525 open to drivers. This major milestone means that we can keep local traffic moving while we deliver the next stage of the Greatworth green tunnel.<\/p>\n<p>\u201cOnce complete, the tunnel will help protect the rural landscape and reduce disruption for people living nearby. We\u2019ve still got a long way to go, but the lessons from Chipping Warden have helped us significantly increased productivity and I\u2019d like to thank everyone who\u2019s worked so hard to get us to this point.\u201d<\/p>\n<h3>The Chipping Warden tunnel was re-aligned earlier this year<\/h3>\n<p>The road over the Chipping Warden tunnel was <a href=\"https:\/\/www.pbctoday.co.uk\/news\/projects\/road-over-hs2-chipping-warden-tunnel-re-aligned-reopened\/155862\/\" target=\"_blank\" rel=\"noopener\">re-aligned in early October<\/a>, with work being undertaken on the A361 carriageway over the tunnel.<\/p>\n<p>The road was closed for 11 days, disrupting traffic between Banbury to Daventry until it could be connected to the new relief road that was built in 2022.<\/p>\n<p>At the time, HS2 Ltd\u2019s senior project manager, Hugo Rebelo, said: \u201cWe\u2019ve had some serious challenges with the Chipping Warden green tunnel, so it\u2019s great to see the A361 permanently diverted and a clear path ahead for the completion of the tunnel.<\/p>\n<p>\u201cThe improvements we\u2019ve made to construction processes over the last year have helped us turn a corner \u2013 but we still need to keep up the focus on productivity, while delivering the work safely and to the necessary quality.<\/p>\n<p>\u201cI\u2019d also like to thank our neighbours for their patience during the road closure, which was necessary to complete the realignment of the road and our site teams for working so hard to get it reopened on time.\u201d<\/p>\n<div class=\"mk-custom-module-container\">\n<\/div>","protected":false},"excerpt":{"rendered":"<p>After the road has been re-aligned, work can continue on what will be HS2&#8217;s longest green tunnel, the Greatworth tunnel.<\/p>\n","protected":false},"author":32,"featured_media":157794,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[172731],"tags":[473,579,696,928],"stakeholder_rel_tag":[],"contributor_rel_tag":[],"class_list":{"0":"post-157792","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-projects","8":"tag-hs2","9":"tag-infrastructure","10":"tag-offsite-construction","11":"tag-rail-network"},"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.9 (Yoast SEO v26.9) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Work moves forward on HS2\u2019s longest green tunnel<\/title>\n<meta name=\"description\" content=\"After 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