First experiences of a new generation of trench cutter – contributing to reducing carbon emissions-Paper

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The paper reports the first European use of Bauer’s BCS 185 single-purpose trench-cutter system on Toulouse Metro Line C. Designed specifically for diaphragm-wall construction, the modular system can excavate trenches up to 90 m deep and 1.5 m wide. Compared with conventional multi-purpose carrier systems, its compact configuration simplifies transport and assembly while maintaining similar production rates.<br /><br />The equipment was used at La Vache and Fondeyre stations, where challenging, layered ground conditions and strict verticality requirements called for trench cutters alongside cable grabs. At La Vache, the main station box required 24 diaphragm-wall panels approximately 52.9 m deep. At Fondeyre, the BCS system’s modularity was particularly valuable when transferring equipment between sites: transport needs fell to two loads, compared with at least five for a conventional system. Transport costs were reduced by about 40%, installation time from roughly one week to two days, and fuel consumption by approximately 10%.<br /><br />These efficiencies reduce costs and associated carbon emissions without compromising production performance or quality. The system also requires fewer personnel and less auxiliary lifting equipment during assembly. A planned electric-driven hydraulic power pack could further cut local emissions and reduce noise by around 50%, supporting use on dense urban sites.<br /><br />The authors conclude that specialized, compact equipment can help meet growing demand for underground infrastructure in constrained city environments while advancing sustainability goals. Future development is expected to focus further on reducing emissions and noise.

Keywords

Bauer BCS 185

trench cutter

diaphragm wall

Toulouse Metro Line C

La Vache station

Fondeyre station

modular equipment

transport cost reduction

carbon emissions

urban underground construction