里底水电站二期围堰施工技术

Construction Technology of Stage II Cofferdam in Lidi Hydropower Station

里底电站二期导流建筑物包括二期上下游围堰填筑、二期围堰混凝土防渗墙施工等。二期上下游围堰填筑利用一期开挖存在仕底倒料场的约备料进行填筑。闭气土料采用巴丁土料场运至上下游围堰填筑。围堰填筑采用挖掘机和装载机在仕底倒运场装运,自卸汽车运输至围堰填筑工作面,采用推土机按照设计的填筑层厚度对渣料平整,再由振动碾碾压。通过里底电站二期施工的布置及特点,对围堰施工方案总结出施工方便、成本低、简单可靠及标准化的施工程序。

Stage II diversion structures of Lidi Hydropower Station include Stage II upstream and downstream cofferdams,concrete cut-off wall of Stage II cofferdam,etc.Stage II upstream and downstream cofferdams are filled with approximate materials from the Shidi dump yard excavated in Stage I.The closed air soil material is transported to the upstream and downstream cofferdams by Bading soil material yard for filling.The cofferdam is filled by excavator and loader at Shidi inverting yard,transported by dump truck to the cofferdam filling working face,then leveled by bulldozer according to the designed thickness of filling layer,and compacted by vibration.Based on the layout and characteristics of stage II construction of Lidi Hydropower Station,this paper summarizes the construction procedures of cofferdam which are convenient,low cost,simple,reliable and standardized.