Method for repairing pre-stressed anchor bolt foundation of installed fan tower

The invention discloses a method for repairing a pre-stressed anchor bolt foundation of an installed fan tower, and relates to the field of foundation engineering. The technical problem to be solved is to provide a quick repairing method which can replace a nut which does not meet the quality requirement with a qualified nut on the premise of not damaging the overall structure of the foundation without scrapping the foundation. The technical scheme adopted by the invention is as follows: the method for repairing the pre-stressed anchor bolt foundation of the installed fan tower comprises the following steps of: firstly, excavating a channel from the outside of the foundation to the bottom of the foundation, excavating the channel to the position under a pre-stressed anchor bolt assembly, and then digging an annular roadway along the pre-stressed anchor bolt assembly; then loosening and tensioning pre-stressed anchor bolts, dismounting unqualified nuts, installing qualified nuts, and then tensioning and fasten