Patent ID: 8496023

Claim:
A temporary drainage system for draining rain water that flows into a floor under construction to an outside of a building during construction of a multiple-story building, including a drainage collection unit and a drainage discharge unit, the drainage collection unit comprising: a flexible drainage collection hose connected to a penetration hole formed in a floor slab of the floor under construction; a drainage collection vessel provided on a floor slab of a constructed floor below the floor under construction of the building and connected to the drainage collection hose; and a drainage pit provided on a lowest floor of the building to collect drainage water discharged from the drainage collection vessel through a drainage hose, and the drainage discharge unit comprising: a drainage pump provided in the drainage pit; a drainage pipe connected to the drainage pump; a drainage collection funnel provided in a floor slab of a constructed floor of the building; and a drainage collection riser pipe buried in the floor slab of the constructed floor of the building and a side wall of the building, wherein the drainage collection riser pipe is connected to the drainage collection funnel, wherein drainage water discharged from the drainage collection vessel is collected into the drainage pit through the riser pipe.