关键词: 面板接缝, 涂覆型止水结构, 严寒地区

Abstract: In the anti-seepage system of concrete face slab rockfill dam, the surface water stop for slab joint is an important part of the whole water stop system for concrete slab. At present, anchored water stop structure is used as most of surface water stops for joints of concrete face slab dams. There are some disadvantages of this structure, such as the gap between cover plate and slab, the difficulty of lapping between surrounding joints and vertical joints, the falling off of bolts due to ice pulling in water level change area and the corrosion of steel strips. Comparison between the coated water stop structure and the anchored water stop structure is carried out. To repair the surface water stop damage in water level change area of Nazixia hydropower station in severe cold area, the coated water stop structure is adopted. After three-year operation, it is proved that the coated water stop structure can effectively prevent the surface water stop from damage caused by ice pulling or expansion, greatly improve the reliability of slab joint seals, and is easy to maintain, which is worthy popularizing and applying.

Key words: slab joint, coated water stop structure, severe cold area