Rainproof tool

The invention belongs to the technical field of immersed tube tunnel steel shell construction and discloses a rainproof tool. The rainproof tool comprises a plurality of rainproof covers, and each rainproof cover comprises a ceiling, a plurality of supporting columns and a plurality of lifting lugs. Each supporting column comprises a column body, a top base and a base, wherein the top base and thebase are arranged at the two ends of the column body correspondingly, the column body is fixedly arranged on the ceiling in a penetrating manner, the top base is positioned above the ceiling, and thebase is located below the ceiling. The multiple rainproof covers have a working state and a stacked state, in the working state, the bases abut against a supporting object, in the stacked state, thebase of one rainproof cover is detachably connected to the top end of the top base of another rainproof cover, and the lifting lugs are arranged above the ceiling and used for lifting the rainproof covers. The provided rainproo