Ultrahigh-pressure water jet device for cutting reinforced concrete slab and using method thereof

The invention discloses an ultrahigh-pressure water jet device for cutting a reinforced concrete slab. The ultrahigh-pressure water jet device is characterized in that the device comprises a numericalcontrol system, an automatic sand supply system, an ultrahigh-pressure generator and a water cutting main machine; the numerical control system comprises a control computer, a keyboard, an operationplatform and rollers; the automatic sand supply system comprises a cover, a handle, a sand supply controller, a sand cylinder, a sand discharge hole and a roller foot stool; the ultrahigh-pressure generator comprises a monitoring hole, a pressurizing main machine and a foot support, the monitoring hole is located in the side face of the pressurizing main machine, and the foot support is located atthe bottom of the pressurizing main machine; and the water cutting main machine comprises a stable base, an X-direction workbench, an X-direction rail, an X-direction crawler belt disc, an X-direction crawler belt, an emergenc