PROJECT
Since 2012, the Rennes Metropolitan Authority has undertaken a large-scale programme to remove 1,100 existing traps in the city’s wastewater collectors.
These traps caused stagnation, odours, and maintenance difficulties.
The goal was to reconnect flows directly to the main collector, eliminating these blockage points.
This 15-year project aims to modernise the sewer network, improve wastewater flow, and reduce maintenance costs and health risks.
PROMPT natural cement was chosen as the reference material for its impermeability, durability, and fast setting even in damp conditions.
Implementation
The project began with a precise diagnostic of each trap to plan interventions and anticipate technical constraints. Each trap was carefully dismantled without damaging the existing collectors.
Teams worked in difficult, humid environments and on operational networks, requiring precision and safety. Pipes were reconnected directly to the main collectors using PROMPT natural cement, ensuring watertightness, strength, and durability.
The fast setting of the material helped limit service interruptions and quickly return the network to operation.
Finally, all work areas were inspected and tested: joints were checked, water flow was verified, and intervention zones were thoroughly cleaned. This method allowed the network to be modernised efficiently, with minimal impact on residents and long-lasting results.
KEY INFORMATION
Project timeline
15 years - ongoing
Client
Métropole de Rennes
Project manager
Rennes metropolitan sewerage service
Compagny
Rennes metropolitan sewerage service
