References
Levesque tank
FRANCE, 2008
Construction of a 3,500m3 capacity storage tank.
Constructed beneath the main square in the heights of Le Havre (between Sainte Adresse and Mont Gaillard), the project forms part of the flood defence scheme launched by the CODAH in 2006 (cfr Demidoff Tank, Jenner Tank).
The project involves the construction of a circular diaphragm wall tank with an underground utilities local that has also been buil using diaphragm walls. The project also includes connections into existing
drainage systems using 70m of ND600 and ND700 pipework. Finally, the tank’s equipment is fully automated (drain cocks, hydraulic isolation valve, odour control, ventilation, dewatering pumps, various items of instrumentation etc.). The soil comprises the clay and silex combination found in the region’s cliffs and the site elevation (92 NGF/French Guideline Standards) explains the absence of water tables in this seaside area.
The civil engineering works present a number of challenges that are exacerbated by the depth of the tank’s floor at 13m. In addition to the prefabricated components that have to be installed (beams, columns, prestressed reinforced floor slabs), these works also include a number of associated structures that are cast in place all of which have to be completed within a reduced time frame (9 months to turnkey of which 3 months were set aside for the civil works).
WORKS CARRIED OUT:
• A 0.60m wide, 22m diameter circular diaphragm wall tank measuring 20m in depth.
• Underground utilities local constructed using diaphragm walls.
• Civil works: 9 columns, 12 beams, 36 prestressed floor support slabs.
• Equipment: 3 drain cocks, 2 x 40l/s dewatering pumps.
• Fully automated tank.
Techniques
Regardless of site size, and providing it involves a significant proportion of works in the ground, Soletanche Bachy will handle the complete project, and all aspects of the works, including site supervision, excavations, foundations, civil engineering and all construction operations.
A diaphragm wall is a reinforced concrete wall that is made in situ. The trench is prevented from collapsing during excavation, reinforcing and casting by the use of supporting bentonite slurry. The slurry forms a thick deposit (the cake) on the walls of the trench which balances the inward hydraulic forces and prevents water flow into the trench. A slurry made of polymers can also be used.
Ouvrages
Soletanche Bachy group is very active in sanitation engineering
The Soletanche Bachy group has wide experience in sanitation engineering.
Voyage au coeur de l'ingénierie de pointe
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