Supervision services for the project: “Connection between the Drinking Water Treatment Plants of Abrera and Cardedeu. Section: Fontsanta – Trinitat. Hydraulic tunnel and pipeline between Riera de Sant Just and Trinitat Distribution Station”

The works involved the construction of an 11 km-long tunnel, with a 6 m diameter, excavated from the two opposite ends with TBMs and lined with precast concrete segments. Three access and service galleries (300, 500 and 800 m long) executed by the conventional excavation method. The inside infrastructure was completed with a concrete platform to support the pipeline and a side lane for maintenance vehicles. The sewer pipeline consists of a welded steel pipe (Ø: 1,800 mm and thickness: 14 mm), with an inside and outside coating of polyurethane, running on supports inside the tunnel and buried in the 4 km section outside the tunnel, totaling 15 km of pipeline.

Hydraulic facilities for control and maneuvering: regulating valves, filters, flow measurement, sectioning, suction devices and connections to the existing facilities. The electrical installation for the lighting, remote control and safety systems. Restitution of the affected land in the buried section parallel to Riera de Sant Just. Relocation of affected utilities and working shafts for the TBMs. The works were divided into four different sections: 2 for the tunnel and 2 for the pipeline.


ATLL, Aguas Ter Llobregat

Project Dates

2007 – 2010



Project Figures

Contract Value:
4,420,117.44 €