三江口水电站引水渡槽伸缩缝漏水重建技术措施

中小型引水工程渡槽槽身伸缩缝渗漏水是常见现象,由于维修重建复杂困难和停水损失,往往带病运行,除了造成水量损失浪费水资源外,也会冲刷渡槽下面公路边坡、路基等,导致安全隐患。本文通过对三江口水电站引水渡槽槽身伸缩缝渗漏水重建实践,表明对于原渡槽槽身结构施工未同步设止水设施的伸缩缝渗漏水,后期釆用外压橡胶带和铜带止水,经过细化设计、精心准备,认真施工,能达到严格止水要求。

Reconstruction Techniques for Leaked Expansion Joints of Diversion Aqueducts in the Sanjiangkou Hydropower Station

Leakage is common in the expansion joints of small and medium diversion aqueducts. Due to the difficulty in maintenance and reconstruction, as well as the cost of stopping water, leaked diversion aqueducts usually stay in service. This causes water loss and the flushing of highway roads and roadbeds below the aqueducts, posing security risks. Reconstruction of the leaked expansion joints of the diversion aqueducts are studied in the Sanjiangkou Hydropower Station. It shows that for the leaked aqueducts which have no synchronized sealing facility in the original structure, using external pressure rubber belts and copper tapes, with refined design and careful construction, can seal up the expansion joints to the extent of satisfying the strict sealing requirements.