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渔子溪二级电站引水隧洞喷射混凝土衬砌段断面为马蹄型,面积为36～42米~2,喷混凝土段长为5455延米。施工时分别采用了“湿喷法”(即SEC法)和“干喷法”。在施工中,及时对喷混凝土起伏差进行了控制、检查,达到了较好的效果。 一、喷混凝土起伏差的控制 1. 采用合理的喷射混凝土程序 喷射混凝土一般采用先凹后凸、先深后浅“螺旋”形或“之”字形连续横向移动,自下而上的程序。这样,不但可以减少回弹量,提高工效,而且便于表面找平,减小起伏差。喷射作业中,在凸处满足最小厚度的情况下,及时调整部份凹处厚度,对起伏差大小的控制至关重要。
The cross section of the shotcrete lining of the diversion tunnel of Yuzizixi Hydropower Station is a horseshoe with an area of 36 ~ 42m ~ 2 and the length of shotcrete is 5455m. Construction were used, “wet spray method” (ie, SEC method) and “dry spray method.” In the construction, timely control of poor jet spray difference, check, achieve better results. First, spray poor control of uneven concrete 1. The use of a reasonable injection of concrete spray gun project generally used concave convex, deep first shallow “spiral” shape or “zigzag” continuous horizontal movement, bottom-up process. In this way, not only can reduce the amount of rebound, improve work efficiency, but also easy to surface leveling, reduce the ups and downs. In the jetting operation, when the convex portion satisfies the minimum thickness, it is very important to adjust the thickness of the partial concave portion in time so as to control the size of the undulation.