Abstract: A cutting apparatus with a ring saw which can easily carry out a high-speed cutting by rotating while applying an impact force, crushing a base rock, a stone, a concrete or the like, and cutting while flicking the crushed portion is provided. Further, a user-friendly cutting apparatus with a ring saw which can easily carry out an operation at a time of attaching as an attachment to a shovel type excavating machine such as a backhoe or the like is also provided. The cutting apparatus with the ring saw in accordance with this invention is a cutting apparatus with a ring saw provided with a cutting blade, and a driving step rotationally driving the ring saw around a center axis thereof, in which the ring saw is supported to a support body attached to an apparatus main body so as to freely oscillate in a cutting and traveling direction, and an impact applying step is provided so as to apply an impact force to a subject to be cut from a cutting blade of the ring saw under rotation.

Abstract: This is related to a driver for driving into circulation a ring saw having a cutting edges in an outer periphery thereof, and to a cutter device having the ring saw to be fixed as an attachment to an arm tip of a shovel-based excavator. An endless strip (6), (46), (51) for circulatively driving the ring saw main body (5), (13), (39) is arranged in a manner being wound at a part of an outer periphery thereof over a part of an outer periphery of the ring saw main body (5), (13), (39). Namely, the ring saw main body (5), (13), (39) is to be driven by an endless strip (6), (46), (51). Moreover, by directly driving the ring saw main body (5), (13), (39) on an outer peripheral side of the endless strip (6), (46), (51) peripheral circuit, the ring saw main body (5), (13), (39) can be inserted deep in a subject-of-cut (32) despite using the endless strip (6), (46), (51).

Abstract: An oil-bearing sludge processing method includes the steps of bringing a processing agent having calcium oxide as its main component into contact with oil-bearing sludge to cause a reaction between a water component of the oil-bearing sludge and the calcium oxide in the processing agent, thereby partially volatizing, dispersing and removing oil component by heat from the reaction and forming porous calcium hydroxide produced by the reaction in a form of a powdery and granular material that has adsorbed the oil component and has been covered with a calcium carbonate layer. The material does not leach out the oil component and is used as a soil fertilizer, a combustion accelerator, a construction material, a road material, etc.