The utility model relates to a drainage device, belongs to the technical field of drainage of
basement terrace hydrophobic
layers, and particularly relates to a drainage device for buried pipelines of a
basement terrace hydrophobic layer, which comprises a water collecting well, a hydrophobic layer main body, a drainage layer, a drainage layer, a drainage layer, a drainage layer and a drainage layer, and is characterized in that a
cast iron ladder is arranged on the inner side of the water collecting well and a top cover is arranged at the upper end of the drainage layer main body; the drainage layer body is arranged on one side of the water collecting well, and a plurality of drainage pipes are installed on the periphery of the inner side of the drainage layer body. According to the drainage structure,
water flow in the drainage layer main body can be conveyed into the water-collecting well through the drainage pipes before the concrete retaining
ridge of the water-collecting well is constructed, it is guaranteed that water in the drainage layer main body can normally overflow into the water-collecting well after follow-up floor concrete pouring is completed, and the drainage effect is guaranteed;
branch pipes are arranged on the outer sides of a plurality of drainage pipes, so that the collection area of
water flow in the drainage layer main body can be enlarged; the problem that
water flow in an existing drainage layer main body can not be smoothly discharged is solved.