Construction method of prestressed pipe pile group close to deep foundation pit engineering

The invention relates to a construction method of a prestressed pipe pile group close to a deep foundation pit project. The construction method comprises the following steps: constructing at least one row of stress release holes between a prestressed pipe pile group construction area and an adjacent first foundation pit in a second foundation pit needing prestressed pipe pile group construction; constructing an anti-extrusion ditch between the stress release hole and the first foundation pit in the second foundation pit, wherein the anti-extrusion ditch is separated from the stress release hole to the first foundation pit; the prestressed pipe piles in m * n (m is the number of rows and n is the number of columns) matrix type distribution are subjected to construction column by column according to the sequence from 1 to m, the first row is relatively close to the first foundation pit, and the mth row is relatively far away from the first foundation pit. According to the method, the influence of the prestresse