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位于青海省民和回族土族自治县的古都灌区内的北干渠,有一段采用“U”型槽150号混凝土衬砌。由于它建筑在湿陷性黄土上,当地冬季又十分寒冷。所以一遇水易造成下沉,致使衬砌出现裂缝,平均每5米就有一条缝宽1～3毫米,影响渠道正常运行。后来,古鄯水库管理所摸索出一个新方法,较好地解决了这一问题。 方法是:按重量比石棉绒90％、黄油10％,将石棉绒和黄油配制好。用手钻将渠内混凝土裂缝凿开深1.5～2厘米,宽1厘米。用
A part of the North Main Canal within the ancient capital irrigation area of Minhe Hui Autonomous County in Qinghai Province adopts a “U” shaped groove of No. 150 concrete lining. Because of its construction on collapsible loess, the local winter is very cold. Therefore, once the water easily cause sinking, resulting in lining cracks, an average of every 5 meters have a slit width of 1 to 3 mm, affecting the normal operation of the channel. Later, Gulang reservoir management to explore a new method, a better solution to this problem. Method is: 90% by weight of asbestos, butter 10%, the asbestos and butter prepared. Drilled concrete trench cracks will be deep trench 1.5 to 2 cm, 1 cm wide. use