Construction method of municipal large-scale pool body structure foundation pit supporting system

The invention relates to a construction method of a municipal large-scale pool body structure foundation pit supporting system. The construction method specifically comprises the following steps: S1,site flattening, surveying and setting out; S2, construction of occlusive cast-in-place piles; S3, construction of a top beam and a first supporting structure; S4, construction of a waist beam and a second support structure; S5, construction of a force transmission belt and a bottom plate; S6, removal of the second support structure; S7, construction of a force transmission belt and a middle plate; S8, removal of the first support structure; and S9, earthwork backfilling. The construction method of the composite foundation pit supporting structure with the cast-in-place piles and the supporting system is improved, low-noise construction can be achieved, the generation amount of waste materials is reduced, and outward transportation of the waste materials is facilitated; meanwhile, under the condition that the supp