Pit-in-pit strong permeable layer basin type curtain structure

The utility model relates to the technical field of building foundation construction, solves the problem that an existing pit-in-pit water stop structure is poor in water stop effect, and discloses a pit-in-pit strong permeable layer basin type curtain structure which comprises a waterproof layer arranged in the bottom wall of a foundation pit and a curtain wall arranged outside the waterproof layer in an attached and surrounding mode. The waterproof layer comprises a plurality of waterproof piles which are arranged in an array and are sequentially engaged, the curtain wall comprises a plurality of curtain piles which are sequentially engaged, all the waterproof piles and the curtain piles are arranged in a plum blossom shape and form a basin shape, and pit slots are dug in the top surface of the waterproof layer. After the foundation pit is excavated, a waterproof layer and a curtain wall are hit into the position, where a pit-in-pit needs to be excavated, of the bottom of the foundation pit, and then pit sl