建筑机械，并具有覆盖安装在发动机和散热器盖和散热器风扇在车辆框架的后部和排气向后从盖的内部空间中的主体框架，注射用于注入还原剂的发动机装置中的废气中，车体框架， 以及箱容纳部，设置在盖和车体框架的一侧并设置在箱容纳部中，用于容纳用于存储由注入装置注入的还原剂的箱体， 以及连接部，通过该连接部，通过散热器风扇的吸入压力从入口部引入的外部空气和还原剂供应到喷射器的管通过该连接部。

Construction machine, and with covering the engine and the radiator cover and the radiator fan for installation at the rear of the vehicle frame and the exhaust to the body frame rearwardly from the inner space of the cover, the injection for injecting the reducing agent to the exhaust gas of the engine device, the vehicle body frame, is provided on the side of the, including the introduction portion for introducing the outside air, and the injection device to the tank for accommodating a tank for storing the reducing agent to pay for spraying and is provided on either side and compartment tank of the cover and the body frame, the number of tank connecting the interior space of the inner space of the housing and the cover, and having a connecting pipe to the passage for supplying the introduced outside air, and a reducing agent to the injection device from the inlet by the suction pressure of the radiator fan.