临时封水闸门在大坝水下修复工程中的应用

Using te m porary sealing gate to replace cofferda m in the underwater repair of dam

江西省柘林水电站泄空洞检修门槽， 由于原设计和施工均存在不同的缺陷， 致使闸门关闭后， 在渗透水压作用下， 造成左孔两侧胸墙以下大部分门槽护角板被挤压脱开， 护角板里面的二期混凝土损坏。泄空洞修复工程， 经多种方案比较， 最终优选水下安装临时封水闸门， 形成旱地施工条件， 完成了检修工程。此方案比采用土石围堰方案可节省７５０ 万元， 对于类似的工程可以借鉴。

The different drawbacks in the original design and construction of the emergency gate slot of the releasing tunnel of Zhelin Hy dropower Station in Jiangxi Province resulted in the disjunction of most slot corner plater underthe paraper walls oftwo sides ofthe left hole andthe damage of the second phrase concrete in these slot corner plates , after the gate in closed and under the action of seepage water pressure . According to the com parison of many alternatives ,the repair scheme of the releasing tunnel adopted the alternative of installing temporary seal ing gate to form dry land construction conditions so that the repair scheme has been com pleted smoothy . This measure could save 7 . 50 million R M B Yuan than that of the earth rock cofferdam so that it could be used in the similar projects for reference .