Top plate waterproof structure

The utility model relates to the technical field of subway engineering construction, and provides a roof waterproof structure which is suitable for a deformation joint of a subway concrete roof, a middle waterstop is arranged in the middle of the deformation joint, and the middle waterstop is communicated with the bottom of the subway concrete roof through a reserved grouting hole; the waterproof effect of the middle waterstop can be effectively improved. 本实用新型涉及地铁工程施工技术领域，提供了一种顶板防水构造，适用于地铁混凝土顶板的变形缝处，变形缝的中部设有中置止水带，中置止水带通过预留注浆孔连通地铁混凝土顶板的底部；本实用新型能有效的提高中部止水带的防水效果。