The utility model belongs to the technical field of municipal pressure flow drainage
engineering, and provides a pressure flow drainage pipeline multi-stage energy dissipation well which comprises a well chamber, a vertical
pipe and a retention wall. The water
retaining wall is vertically fixed in the well chamber, the water
retaining wall divides the bottom in the well chamber into a water inlet chamber and a water outlet chamber, a water inlet is formed in the side wall of one side of the well chamber, the pressure drainage pipeline is inserted into the water inlet, the vertical
pipe is arranged above the water inlet chamber, and the water outlet is formed in the side wall of the other side of the well chamber. The inner end of the pressure drainage pipeline is communicated with the top end of the vertical
pipe, a water inlet concrete
cushion layer is laid on the inner bottom face of the water inlet chamber, a
pebble bed is laid on the water inlet concrete
cushion layer, a horizontal drainage hole is formed in the side wall of the water
retaining wall in a penetrating mode, and the bottom end of the drainage hole is flush with the top end of the water inlet concrete
cushion layer. A water outlet is formed in the side wall of the water outlet chamber, and the
gravity drainage pipeline is inserted into the water outlet. The energy dissipation well can solve the problems that an existing energy dissipation well is large in occupied space, and a retention wall is prone to damage due to large
impact of
water flow.