Construction method for isolation pile close to building

The invention relates to a construction method for an isolation pile close to a building, which is arranged between a foundation pit and a building structure, and is characterized by comprising the following steps: constructing an enclosure isolation area between the foundation pit and the building structure, and arranging the enclosure isolation area along the extension direction of the foundation pit; a plurality of pieces of H-shaped steel are arranged at intervals in a guide hole in the side, close to the foundation pit, in the enclosure isolation area; a plurality of first row of MJS swing spraying holes are formed in the side, close to the building structure, of the enclosure isolation area at intervals; grouting is conducted on the first row of MJS swing spraying holes, and rotary spraying is conducted by 180 degrees to form a first row of MJS construction method piles; and a second row of MJS swing spraying holes are formed in the side, close to the foundation pit, of the enclosure isolation area and