It is powered by hydraulics and is driven by either an electric or diesel/petrol engine. The C shaped type has a piston that closes to crush the material. The limitations of this method are that the jaws are heavy and require a counter balancer to take much of the weight.
It is also restricted to material under 350mm in thickness. It requires a fully boarded scaffolding below the floor area being worked upon. The advantages are small resulting rubble, no vibration, almost no noise and no water.
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