The invention relates to a construction method of a foundation pit
enclosure used in the influence range of pipelines. The construction method comprises the steps that deep grooves are excavated alongthe outer sides of the two edges of a foundation pit to be excavated correspondingly, wherein the sides, far away from the foundation pit, of the deep grooves are slope surfaces; an enclosing piles are arranged at gaps of the pipelines in the deep grooves, a
pile top crown beam is arranged by taking the enclosing piles as a support, and a
steel bar joint is reserved at the bottom of the
pile topcrown beam; a
retaining wall is arranged on the surfaces of the slope surfaces; the foundation pit is excavated in a layered mode, and at the same time enclosing walls are arranged between every two enclosing piles; and after excavation of the foundation pit is completed, earthwork is backfilled between the
retaining wall and enclosing walls. Through the construction of the
retaining wall and enclosing walls, the earthwork on the two sides of the foundation pit is reinforced, the arranging number of base piles during the construction of the
pile top crown beam is reduced, the pipelines and thefoundation pit
enclosure can be arranged alternately, the
relocation of the original pipelines is avoided, and the construction method has the advantages that the
engineering quantity is effectivelyreduced, the operation is simple, the overall stability of the foundation pit
enclosure structure can be effectively improved, the construction progress can be accelerated, the construction cost can be saved, and the influence on water,
electricity, gas communication and the like of residents is small.