Tubing and open trench renewal of a section of feeder DN 400 mm “Pierrefitte-Domont”, part of the four reaches 040-01-16, 040-01-21, 040-01-26 and 040-01-31.

Tubing and open trench renewal of a section of feeder DN 400 mm “Pierrefitte-Domont”, part of the four reaches 040-01-16, 040-01-21, 040-01-26 and 040-01-31. The pipe is mainly Bonna type (concrete pipe with sheet metal frame) assembled by welded steel and lead cast joints. This contract concerns the following works: annular vacuum casing of the pipeline DN 400 mm concrete core existing sheet metal by an HDPE pipeline with internal diameter 353 mm, on an overall linear of 966 m; open trench work on 132 m overall linear; sinking for the crossing of RD 301 on a linear close to 22 m; trench work open, from the end of sinking, to the end valve of Tief 31.