The utility model belongs to the technical field of the waterproof material of using of building stagnant water, a waterproof board, drain bar or prevent drain bar that is used for between tunnel preliminary bracing and the secondary lining is disclosed. Its technical scheme comprises with the plastic substrate who connects in between the convex hull a plurality of convex hulls, and both structures as an organic whole, combination department of base plate and convex hull is arc or chamfer structure. The uncompacted problem of concrete filling in convex hull and plastic substrate's combination department stress concentration and the convex hull is solved to the panel of this structure.