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丹江口混凝土骨料在筛分厂筛分后,用皮带机运至混凝土拌合厂。全程1.7公里、20多个环节,9米以上的落差达三次之多,致使石子破碎分离现象严重,大石子(40～80、80～120毫米)逊径含量达26％左右。经我们采取溜槽缓冲、螺旋缓降等措施后,破碎有所改善,但是问题并未彻底解决,大石子破碎仍较严重,分离造成逊径不稳定波动幅度很大,这将改变混凝土的配合比,影响混凝土质量。因此,采取有效措施,减少石子破碎分离直接关系到混凝土大坝浇筑质量。在规划设计阶段就曾经考虑过用二次筛分的措施来彻底解决石子逊径问题。但由于当时对石子粒
Danjiangkou aggregate concrete screening in the screening plant, the belt conveyor to the concrete mixing plant. Throughout the entire 1.7 km, more than 20 links, more than 9 meters drop of up to three times, resulting in gravel separation severely, boulders (40 ~ 80, 80 ~ 120 mm) content of about 26% of the diameter. After we adopted measures such as chute buffering and spiral descending, the crushing has been improved. However, the problem has not been completely solved. The crushing of boulders is still serious. The separation caused a great fluctuation in the range of the unstable erratic, which will change the mix ratio of concrete , Affect the quality of concrete. Therefore, to take effective measures to reduce the fragmentation of gravel is directly related to the quality of concrete dam pouring. In the planning and design phase had considered the use of secondary screening measures to completely solve the problem of stone size. But because of the stone tablets at the time