Construction machine

A construction machine, comprising:

• a lower travelling body;
• an upper slewing body mounted on the lower travelling body to be slewable around a vertical axis;
• a plurality of hydraulic actuators;
• a control valve assembly which is an assembly of control valves configured to control respective actuations of the hydraulic actuators, respectively;
• a plurality of remote control valves for operating the control valves, respectively;
• an operation-pattern selector valve for selecting an operation pattern of combinations between the remote control valves and the control valves;
• a plurality of remote control hoses which connect the remote control valves to the operation-pattern selector valve, respectively;
• a plurality of pilot hoses which connect the control valves which connect the operation-pattern selector valve, respectively;
• and
• a plurality of actuator hoses which connect the control valves to the hydraulic actuators, respectively, wherein:
• the upper slewing body includes an upper frame, the upper frame including a bottom plate, and a floor plate disposed over the bottom plate with a distance, an operation seat being provided on the upper frame;
• the control valve assembly and the operation-pattern selector valve are provided in an underfloor space between the bottom plate and the floor plate, a partition wall being provided to stand upright on the bottom plate at a rear side of the control valve assembly;
• and
• the operation-pattern selector valve includes a tubular body, a shaft held in the body rotatably around an axis of the shaft, and a handle for switching operation, the handle extending from one end of the shaft in a direction orthogonal to the axis of the shaft, the operation-pattern selector valve being disposed in such a horizontal posture that the shaft extends horizontally, at a front side of the control valve assembly as viewed from an operator seated on the operation seat.