Sea Outfall Saint-Jean-Cap-Ferrat realized under limited space conditions
Oct 18, 2007
The modernization of the sewage system of Saint-Jean-Cap-Ferrat (Côte d’Azur) in France included the installation of a 110m long Sea Outfall pipeline. The construction company RPS mastered the narrow access routes, limited space conditions and unstable geology using a mobile Herrenknecht Crawler Rig HK150C.
At the “Pointe de la Causinière“, the seafloor is covered with corals. For environmental reasons, the cuttings therefore could not be removed with bentonite. Instead, they were ejected with compressed air. The geology – first, brittle and porous folded rock consisting of clay and limestone, and then weathered rock and sand formations – represented a challenge for both the contractor RPS and the drilling technology. The first 10 meters of the bore were lined with concrete to avoid settlement and make cuttings removal with compressed air more efficient.
The planned pipeline alignment with a steep entry angle of 22 degrees could be handled without problems by the Herrenknecht rig and the jobsite installation that had been specially adapted. In HDD drilling, the drill bits are changed after pilot bore to expand the drill hole to its final diameter. A tricone drill bit (Ø 200 mm) was exchanged with a hole opener (Ø 864 mm), a hard rock drill bit, to expand the pilot hole at a depth of 36 meters below sea level. The disassembled drill bit then floated to the surface with an airlift bag. The hole opener was lowered into the sea in the same way, where divers connected it to the drill string. The Herrenknecht Crawler Rig HK150C with a thrust and pullback force of 150t then expanded the 110m long drill hole to its final diameter of 864mm. After pullback of the product pipe, the construction works were completed on July 4th, 2007. A challenging Sea Outfall project, characterized by limited space conditions, a steep entry angle, and unstable geology, was successfully completed by the construction team using the flexible and efficient Herrenknecht Crawler Rig.
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