Supporting structure for foundation pit of elevator shaft

The utility model discloses an elevator shaft foundation pit supporting structure which is characterized in that an elevator shaft is arranged in a foundation pit, a base layer is arranged at the bottom of the elevator shaft, a ponding pit is formed in the center of the base layer and communicated with the bottom face of the foundation pit, a pipe groove is formed in the side portion of the base layer, a drainage pipe is arranged in the pipe groove, and the inner end of the drainage pipe extends to the ponding pit. The outer end of the drainage pipe extends to the ground and is connected with a water pump device; a central well opening is formed in the middle of the elevator shaft, a liquid level switch device is installed on the inner wall of the central well opening, the liquid level switch device is connected with the water pump device, the liquid level switch device is provided with a liquid level detection unit, and the liquid level detection unit is matched with water in the water sump in a triggering m