| abstract |
A urea water tank (28) for containing urea water solution is provided in a utility chamber (6G) placed at a position located at front right of the rotation frame (6) and easily accessible by hand from the periphery. In this arrangement, an intermediate portion of work device piping (21) that is a part of hydraulic oil piping (18) and supplies and discharges hydraulic oil to and from a boom cylinder (5D) of a work device (5) is laid along the outer surface of the urea water tank (28). This means that, even if the urea water tank (28) is installed at a place around which there is nothing functioning as a heat source, the urea water solution in the urea water tank (28) can be stably heated from around the tank by heat of the hydraulic oil flowing in the work device piping (21). Further, the urea water tank (28) can be installed at a place where a worker can easily work, and this facilitates filling of the tank with the urea water solution, maintenance work, etc. |