Unbonded prestressed anchor cable grouting cap

The utility model discloses an unbonded prestressed anchor cable grouting cap. A cap body of the grouting cap is of a hollow cylinder with an opening at one end, a grouting hole penetrating through a grouting pipe is arranged on the end surface at the sealed end of the cap body, an exhaust pipe is arranged in the position, which is close to the sealed end of the cap body, on the body wall of the cap body, and a valve is arranged on the exhaust pipe. When the unbonded prestressed anchor cable grouting cap is applied, the open end of the grouting cap disclosed by the utility model is mounted on a steel padding plate, when grouting is started, the valve is opened, and when grout flows out of the pipe orifice of the exhaust pipe, the valve is closed, and high pressure is kept for continuing grouting so as to enable an anchor cable hole to perform circulating grouting under the design pressure till the design requirements are achieved; and after the end of grouting, the grouting cap is further dismantled after the grout is solidified. The unbonded prestressed anchor cable grouting cap disclosed by the utility model can be used for enabling the grouting in the anchor cable hole to be saturated, reducing the waste of the grout, eliminating the need of secondary grout supplement construction, effectively reducing engineering cost and realizing long-term repeated use.