{"id":8357,"date":"2021-01-15T17:41:46","date_gmt":"2021-01-15T16:41:46","guid":{"rendered":"https:\/\/www.sade-cgth.fr\/?p=8357"},"modified":"2021-01-15T17:41:46","modified_gmt":"2021-01-15T16:41:46","slug":"a-first-for-lyon","status":"publish","type":"post","link":"https:\/\/www.sade-cgth.fr\/en\/blog\/geography\/africa-en\/a-first-for-lyon\/","title":{"rendered":"A first for Lyon…"},"content":{"rendered":"

[vc_row][vc_column width=”2\/3″][vc_column_text css=”.vc_custom_1610728903020{margin-right: 20px !important;}”]In Lyon, Gantelet-Galaberthier has dug a tunnel 5 metres under the water table and 8 metres under natural ground level, using a standard sheltered technique with jet grouting in the soil mass.<\/b><\/span><\/p>\n

The Lyon subsidiary set itself the impressive challenge of creating the final section of these sewer mains along 180m! This is the first time a gallery has been dug using traditional methods in the alluvium of the Sa\u00f4ne river.<\/span><\/p>\n

To achieve this, a technique had to be devised in order to create a waterproof underground mass, from surface level, around the future location of the gallery, enabling miners to dig and reinforce the facility safely.<\/span><\/p>\n

In order to avoid the driving of sheet piles in this district in the 9<\/span>th<\/span> arrondissement, M\u00e9tropole de Lyon initially opted for the jet-grouting technique along a 15m test phase.<\/span><\/p>\n

This technique treats the soil mass by high-pressure injection of cement-based slurry, resulting in an in-situ mixture of soil and cement. A sufficiently tight grid of these columns of jet grouting ensures both waterproofing of the mass and a ground texture which is not too resistant to manual digging.<\/span><\/p>\n

This innovative solution was definitively approved by the customer after this test phase. Works are thus continuing with:<\/span><\/p>\n