Environmental Protection Solutions

Application

Decontamination project

Solution

S 355 GP 7 m 154t

Dépollution de sols Annecy | France | 2024

Un acteur international de production d’emballage métallique pour l’industrie de la cosmétique a dépollué son ancien site industriel avant sa mise en vente. Dans les Alpes françaises, dans la ville d’Annecy, un projet de dépollution est réalisé avec une approche bascarbone, grâce à l’utilisation temporaire de palplanches métalliques. Dans les cas de dépollution de sols, souvent la terre est excavée et transportée vers un autre site pour y être traitée. Dans ce cas-ci, le maître d’ouvrage a choisi une variante qui évite de déplacer les sols pour leur dépollution.

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To ensure effective operation and to prevent any impact of the heat treatment (caused by circulation) on the ground water, the treatment area was enclosed by a curtain of watertight sheet piling.

DFC Battage installed 183 pairs of uncrimped GU 13N sheet piles, each 7 metres long. A total of 220 metres in plan was installed using a 55-tonne crawler crane with a lattice boom. To avoid vibrations that could damage neighbouring buildings, a variable high-frequency vibrodriver was used—specifically a PTC 23HFV.

 

To ensure effective operation and to prevent any impact of the heat treatment (caused by circulation) on the ground water, the treatment area was enclosed by a curtain of watertight sheet piling.

DFC Battage installed 183 pairs of uncrimped GU 13N sheet piles, each 7 metres long. A total of 220 metres in plan was installed using a 55-tonne crawler crane with a lattice boom. To avoid vibrations that could damage neighbouring buildings, a variable high-frequency vibrodriver was used—specifically a PTC 23HFV.

The top layer of soil generally consisted of brown/grey clayey fill, followed by a layer of grey clayey sand. For this particular project, the in-situ thermal desorption method was used to remove a chemical solvent (Trichloroethylene) from the soil.