Gantry type cement-soil mixing pile combined inter-pile dewatering foundation pit supporting structure

The utility model discloses a portal type cement soil mixing pile combined inter-pile dewatering foundation pit supporting structure which comprises a gravity type dam body, the gravity type dam body comprises an inner-layer supporting body, an outer-layer supporting body and a top plate, the inner-layer supporting body is arranged outside a foundation pit in a surrounding mode, the outer-layer supporting body is arranged on the outer side of the inner-layer supporting body in a surrounding mode, and the top plate is arranged on the outer side of the outer-layer supporting body; the top plate is arranged at the top of the inner-layer supporting body and the top of the outer-layer supporting body; and the precipitation measure is arranged on the gravity type dam body, and precipitation can be conducted through the precipitation measure so that the soil body in the gravity type dam body can be solidified. According to the utility model, the quantity of mixing piles can be greatly reduced, the construction perio