Pit-in-pit strong permeable layer basin type curtain construction method

The invention relates to the technical field of building foundation construction, solves the problems that the construction efficiency and quality of a pit-in-pit water stop structure are low, and discloses a pit-in-pit strong permeable layer basin type curtain construction method which comprises the following construction steps of construction preparation, surveying and lofting, pile body jet grouting, pile body maintenance and pit groove digging. After the bottom face in a foundation pit is leveled, the position of each pile body is measured and marked, the top elevation of each waterproof pile is lower than the top elevation of each curtain pile, the waterproof piles and the curtain piles are jet-grouted according to the designed pile positions and elevations, and jet-grouting cement slurry is not jet-grouted above the top elevation positions of the waterproof piles to form excavation parts; the waterproof piles and the curtain piles form a basin-shaped waterproof curtain with a groove, then the pit-in-pit