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What advantages does a hydromill offer when compared to
conventional clamshell excavation equipment?

Cable suspended and hydraulic clamshells were the standard slurry wall excavation tools for over 50 years. Innovations in the industry have brought to the development of the hydromill technology. Hydromills offer high production rates in dense granular soils and most bedrock conditions. Penetration rates in these subsurface materials are substantially higher than with conventional cable suspended mechanical or hydraulic clamshells. However, they do not perform as well in cohesive soils, where the traditional clamshells tend to remain the tool of choice. Mobilization, operation, and ownership costs are significantly higher for the hydromill and therefore its use must be justified by soil and rock conditions and by the size of the project.   

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