{"id":3530,"date":"2026-04-14T13:10:40","date_gmt":"2026-04-14T11:10:40","guid":{"rendered":"https:\/\/www.igeas.com\/?post_type=realizzazioni&p=3530"},"modified":"2026-04-24T19:22:08","modified_gmt":"2026-04-24T17:22:08","slug":"upgrading-and-realignment-of-state-road-no-28-del-colle-di-nava-between-km-130-4-and-km-132-7","status":"publish","type":"realizzazioni","link":"https:\/\/www.igeas.com\/en\/projects\/upgrading-and-realignment-of-state-road-no-28-del-colle-di-nava-between-km-130-4-and-km-132-7\/","title":{"rendered":"Upgrading and realignment of State Road No. 28 \u201cdel Colle di Nava\u201d between km 130.4 and km 132.7."},"content":{"rendered":"

Project objective<\/strong><\/p>\n

The road variant was constructed to improve ride quality and safety along the infrastructure, which carries a high volume of heavy vehicles travelling to and from the Alpine pass of \u201cColle di Nava\u201d, connecting the Liguria Region with southern Piedmont.<\/p>\n

Main works<\/strong><\/p>\n

Tunnel \u201cMadonna degli Angeli\u201d<\/em>
\nThe excavation, approximately 676 m long, affected a rock mass locally characterised by very poor geomechanical properties; to overcome these conditions, also with low overburden, specific construction measures were required to ensure safe excavation, adopting a half-section advance method with pre-consolidation works.
\nFor the excavation faces at the portals, given the presence of cover deposits and altered rock horizons, stabilisation works were required consisting of anchored retaining walls with tiebacks.<\/p>\n

Viaduct over the Impero stream<\/em>
\nIn the section between the south portal of the tunnel and the end of the lot, a viaduct over the Impero stream was built (Viaduct \u201cImpero 1\u201d, L = 268 m, 9 spans).
\nThe viaduct deck consists of precast prestressed reinforced-concrete beams, with reinforced-concrete piers and abutments.
\nFor the foundations it was necessary to adopt piled foundations (indirect foundations).<\/p>\n

Interchanges<\/em>
\nFor the two interchanges, one near the north portal of the tunnel and the other at the end of the lot, earth-retaining works were built consisting of reinforced-concrete retaining walls and a two-span bridge (Viaduct \u201cImpero 2\u201d, L = 60 m).
\nFor the foundations it was necessary to adopt piled foundations (indirect foundations).<\/p>\n","protected":false},"featured_media":3690,"parent":0,"template":"","settore":[26],"class_list":["post-3530","realizzazioni","type-realizzazioni","status-publish","has-post-thumbnail","hentry","settore-road-infrastructures"],"acf":[],"yoast_head":"\nUpgrading and realignment of State Road No. 28 \u201cdel Colle di Nava\u201d between km 130.4 and km 132.7. - IGEAS Engineering S.r.l.<\/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:\/\/www.igeas.com\/en\/projects\/upgrading-and-realignment-of-state-road-no-28-del-colle-di-nava-between-km-130-4-and-km-132-7\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Upgrading and realignment of State Road No. 28 \u201cdel Colle di Nava\u201d between km 130.4 and km 132.7. - IGEAS Engineering S.r.l.\" \/>\n<meta property=\"og:description\" content=\"Project objective The road variant was constructed to improve ride quality and safety along the infrastructure, which carries a high volume of heavy vehicles travelling to and from the Alpine pass of \u201cColle di Nava\u201d, connecting the Liguria Region with southern Piedmont. Main works Tunnel \u201cMadonna degli Angeli\u201d The excavation, approximately 676 m long, affected […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.igeas.com\/en\/projects\/upgrading-and-realignment-of-state-road-no-28-del-colle-di-nava-between-km-130-4-and-km-132-7\/\" \/>\n<meta property=\"og:site_name\" content=\"IGEAS Engineering S.r.l.\" \/>\n<meta property=\"article:modified_time\" content=\"2026-04-24T17:22:08+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.igeas.com\/wp-content\/uploads\/2026\/03\/028_LOMBARDINI_Variante_SS28-1_00.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1004\" \/>\n\t<meta property=\"og:image:height\" content=\"689\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data1\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.igeas.com\\\/en\\\/projects\\\/upgrading-and-realignment-of-state-road-no-28-del-colle-di-nava-between-km-130-4-and-km-132-7\\\/\",\"url\":\"https:\\\/\\\/www.igeas.com\\\/en\\\/projects\\\/upgrading-and-realignment-of-state-road-no-28-del-colle-di-nava-between-km-130-4-and-km-132-7\\\/\",\"name\":\"Upgrading and realignment of State Road No. 28 \u201cdel Colle di Nava\u201d between km 130.4 and km 132.7. - 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