Drainage structure for deep foundation pit fat groove backfilling

The utility model provides a drainage structure for deep foundation pit fat groove backfilling, which comprises a poured concrete structure, a waterproof layer arranged on the outer surface of the poured concrete structure and a waterproof protection layer, and is characterized by further comprising a water sealing layer laid at the bottom in a deep foundation pit fat groove along the circumferential direction, a gravel filtering layer laid on the water sealing layer, and a drainage layer laid on the gravel filtering layer, the vertical shaft is built on the upper surface of the water sealing layer, penetrates through the gravel filtering layer and extends to the top of the deep foundation pit fat groove, the geotechnical cloth is laid on the upper surface of the gravel filtering layer and wraps the vertical shaft, and the water pump is arranged in the vertical shaft. According to the drainage device, accumulated water remaining in the deep foundation pit fertile groove in the water ramming method constructio