Project & Case Study Showcase
TRENCHLESS INSTALLATION OF A NEW 400 METRE SEWER SYSTEM
In the historic city of Treviso, Italy, a new 400-metre sewer system was installed 11 metres underground beneath an active railway line and the River Sile. Using slurry-supported microtunnelling and DN 800 KERA. Drive vitrified clay jacking pipes, the project overcame challenging groundwater and loading conditions to deliver a durable, watertight solution with minimal surface disruption.
Background In the historic city of Treviso, the construction of a new sewer system was required to support urban infrastructure in a highly sensitive environment.
The project alignment runs beneath both a railway line and the river Sile, in an area characterised by high groundwater levels similar to Venice. The project brought together several demanding load cases, creating exceptionally complex design and construction conditions.
The Challenge The project combined an unusual concentration of demanding design and construction requirements:
• Installation beneath an active railway line
• Crossing below the Sile river
• High groundwater levels
• Installation depth of approximately 11 m
• Sensitive urban environment in the city centre
• Long-term resistance to hydraulic and geotechnical loading
This combination of conditions created a highly complex project environment, requiring a pipe system capable of performing reliably under multiple simultaneous load cases.
Project Overview Country: Italy City: Treviso Year of construction: 2025 Application: New Sewer Total length: 400 m Nominal diameter: DN 800 Technology: KERA. Drive Installation: Trenchless Consultant: ENKI Contractor: LF Costruzioni Client: ATS, water company
The Solution A microtunnelling approach using a slurry system was selected to enable safe and precise installation under this exceptional combination
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