High-pressure jet grouting anchor cable drilling tool capable of preventing steel strands from being wound and construction method

The invention provides a high-pressure jet grouting anchor cable drilling tool capable of preventing winding of steel strands and a construction method, and belongs to the technical field of deep foundation pit supporting construction.The drilling tool comprises a jet grouting drill rod, a jet grouting drill bit, a step-shaped protrusion, an anchor disc, a resistance increasing plate and an anchorage device, the jet grouting drill bit is connected with the jet grouting drill rod, and two nozzles, a drill rod connector and a pressure bearing are arranged on the jet grouting drill bit; the pressure bearing is sleeved with a bearing outer sleeve, the drill rod connector is suitable for being connected with a rotary spraying drill rod, the step-shaped protrusion is arranged in the middle of the rotary spraying drill bit and located on the side, close to the rotary spraying drill rod, of the pressure bearing, a penetrating hole is formed in the anchor disc, a slurry overflowing groove is formed in the end of the a