Construction method for prefabricated building enclosure of deep foundation pit in low-temperature environment construction

The invention relates to the construction of building enclosures of deep foundation pits, in particular to construction method for a prefabricated building enclosure of a deep foundation pit in low-temperature environment construction. The construction method comprises the following steps of: prefabricating pile sections of enclosure piles, finishing boring pile positions according to design requirements, hoisting and placing the enclosure pile sections section by section and connecting the sections into integers in field to compose prefabricated enclosure pile retaining walls; and excavating the foundation pit, and finishing constructing transversely-supported internal structures among the prefabricated enclosure pile retaining walls so as to compose the prefabricated building enclosure of the deep foundation pit. The construction method provided by the invention has the advantages that: the building enclosure of the foundation pit is made of factory prefabricated members, the in-situ binding of reinforcing steel bar and pouring and curing of concrete under subzero temperature conditions can be avoided, so that the measure cost for winter construction is saved, the working environment is improved, the work efficiency is enhanced, the site construction period is shortened, and meanwhile, the quality of poured concrete of the building enclosure can be ensured.