Construction of an Office Block
Lowering the water table by bleeder wells during construction of an office building with 2 basement levels
Context
Project Type :
Dewatering
Location :
Lyon (69)
Problem
- To construct a high-rise office block in the district of PART-DIEU, with 2 basement levels, the customer requested us to lower the alluvial water table present adjacent to the project, with the height to be reduced of 3.0 m on a surface of 3 500 m2.
Solution
- Scaling the lowering of the water table by our internal hydrogeologist
- Setting up 3 pumping wells at a depth of 12 m and 2 reinjection wells at a depth of 14 m
- Diaphragm wall anchored into the molasse
- Dewatering flow rate: 150 m³/h
- Complete pumping installation:
- Pumps
- Dewatering network
- Decantation before reinjection
- Instrumentation
- Direct recording of piezometric levels inside and outside of the diaphragm wall and pumped volumes, and monitored on a dedicated Internet platform
- Remote monitoring of pumping with permanent on-call service
- Overall duration: 12 months
