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天生桥一级混凝土面板堆石坝垫层采用的是高产量人工砂石系统过 # 3筛生产的灰岩料 ,垫层施工实践证明 :(1)对垫层而言 ,该灰岩料符合现代级配标准 ,碾压效果良好 ,生产简单、廉价 ;(2 )对高混凝土面板堆石坝而言 ,如果计划采用同一人工砂石骨料系统生产垫层料和混凝土骨料 ,则施工计划需要仔细考虑 ,为防止材料短缺耽误面板施工 ,垫层料生产应有储备 ;(3)因为边坡冲刷修复条件较困难 ,碾压效果总是较常规碾压差 ,所以边坡表面保护非常重要 ,应避免出现不必要的冲刷 ,在劳动力便宜的国家 ,手工铺砂浆较喷混凝土、沥青乳胶或稀释物更具竞争力 ;(4 )为避免垫层或混凝土面板后面水压上升 ,上游区临时排水是重要的 ,虽然可不依赖水泵系统 ,但由于可能出现排水管被堵塞的情况 ,所以应设置水泵竖井 ;(5)面板开口是大多数高混凝土面板堆石坝都会出现的一种现象 ,原因是低处填筑坝体的变形和混凝土面板的刚性 ,采用浆液填塞开口简单、方便 .
Tianshengqiao a concrete faced rockfill dam cushion is produced by high-output artificial sandstone system # 3 limestone material production, cushion construction practice has proved that: (1) for the cushion, the limestone material in line with the modern Grading standards, rolling effect is good, production is simple and cheap; (2) for high concrete face rockfill dam, if plan to use the same gravel aggregate system to produce mat material and concrete aggregate, the construction plan needs Careful consideration, in order to prevent the shortage of materials to delay the panel construction, cushion material production should have reserves; (3) Because the slope erosion repair conditions are more difficult, the rolling effect is always worse than the conventional rolling, so the slope surface protection is very important, To avoid unnecessary scouring, manual mortar should be more competitive with shotcrete, asphalt latex or dilution in countries where labor is cheap; (4) To avoid temporary pressure rises in the upstream area to avoid an increase in water pressure behind the mat or concrete panel, It is important that although not depending on the pump system, the pump shaft should be provided due to possible plugging of the drainpipe; (5) Panel openings are found in most high concrete faced rockfill dams A phenomenon, because the filling dam rigid deformation and the lower concrete slab, a slurry of the packing the opening is simple and convenient.