Slurry circulation pile port casing for slurry supporting cast-in-place bored pile

The utility model discloses a slurry circulation pile port casing for a slurry supporting cast-in-place bored pile, which has a flow guide function on forward and reverse circulation of slurry in a hole of the slurry supporting cast-in-place bored pile. According to a first embodiment of the utility model, the pile casing comprises a casing body and a suspension ring, wherein an overflow port is formed in the casing body, an overflow pipe is connected onto the overflow port, and slurry is guided into various slurry circulation routes through the overflow pipe. According to a second embodiment of the utility model, the pile casing comprises the casing body and the suspension ring, wherein the overflow port is formed in the casing body, an external threadnipple is welded onto the overflow port and is in screwed connection with a bulb connection deviceprovided with the overflow pipe which is mounted in the bulb connection device, the slurry is guided into various slurry circulation routes through the overflow pi