泸定水电站泄洪洞混凝土裂缝处理与防治

Treatment and Prevention on the Concrete Crack of Spillway Tunnels in Luding Hydropower Station

泸定水电站2号泄洪洞混凝土施工过程中出现了大量裂缝,为此进行了对比试验,对施工方法、原材料进行了调整,通过采用C9035聚羧酸低热混凝土,控制洞身混凝土仓位最大浇筑长度,加强振捣,采取防风保温措施等,使裂缝数量、长度与宽度得到明显改善。3号泄洪洞进一步优化施工工艺,裂缝得到了更有效的控制。

A large amount of eracks emerged in the concrete construction of No. 2 spillway tunnel in Luding Hydropower Station. After comparing tests, the crack number, length and width are significantly decreased by adopting crack control measures, in which the construction method and raw materials are adjusted by using the C90 35 polyearboxylate low-heat concrete, the maximum length of concrete pouring space is limited, the concrete vibrating is strengthened and the wind prooting and thermal insulation measure are adopted. By using these measures in the construction of No. 3 spillway tunnel and further optimizing construction technology, the crack in No. 3 spillway tunnel is effective controlled.