Deep foundation pit sub-warehouse underground diaphragm wall bottom plate closure section transition structure

The utility model discloses a deep foundation pit sub-warehouse underground diaphragm wall bottom plate closure section transition structure which comprises a sub-warehouse underground diaphragm wall and a foundation beam plate, beam plate steel bars and a water stop steel plate are arranged in the foundation beam plate, and a waterproof protection layer, a waterproof roll and a cushion layer are arranged below the foundation beam plate. A section of gap is reserved at one end, close to the separated underground diaphragm wall, of the foundation beam plate and the waterproof protection layer and is sealed through a fast-easy closing net, the cushion layer is integrally poured to the side wall of the separated underground diaphragm wall to tightly block the bottom end of the gap, and beam plate steel bars and waterproof coiled materials extend into the gap to form a stubble section for sealing protection; and low-grade concrete is poured in the gaps to connect the subwarehouse underground diaphragm wall and th