The present invention relates to a 40-ton class dredger, and relates to a 40-ton class dredger having a dredging unit including a boom for dredging work mounted at all times to reduce load and improve dredging work efficiency. In the 40-ton dredger of the present invention, a dredging unit including a boom for dredging work is always mounted on the main buoyancy body, and the operation of the dredging unit can be made together in the cab, so that the load can be reduced and the dredging work efficiency can be improved. There is an advantage. In addition, since the 40 ton class dredge of the present invention is moved using a spud unit or a boom without a separate propulsion means including an engine which occupies a large proportion, there is an advantage that the load can be reduced. In addition, in the 40-ton dredger of the present invention, the first and second dredged soil discharge pipes are rotatably mounted with respect to the main boom, and the first and second dredge discharge pipes are kinked by the discharge pipe sagging prevention unit supporting the second dredged soil discharge pipe As sagging is prevented, there is an advantage that dredging operation efficiency can be improved. In addition, the 40-ton dredger of the present invention is provided with an auxiliary buoyancy means detachable to the main buoyancy body in which the dredging unit and the cab are provided so as to respond to the buoyancy required according to the water depth, so that dredging work can be performed in various underwater environments. have.
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