KET水电站河岸式厂房施工导流方案研究

Study on the construction diversion scheme of bank power plants of KET hydropower station

该电站厂房与河床毗邻布置,基坑挖深20m,其施工导流具有河床宽度窄、施工布置约束大、导流流量大、河床覆盖层深厚且存架空结构、设计难度较大等特点。主要从导流建筑物全围封或半围封厂房基坑的布置型式、厂房后期永久防护、防渗方式、等方面进行考虑,提出了3个导流方案,最终选择沿河床右岸紧凑布置土石围堰、堰体及堰基采用土工膜斜墙+混凝土防渗墙的施工导流方案,该方案最经济且施工风险小,与永久防护措施结合更容易。

The power plant is adjacent to the riverbed, foundation pit digging deep 20 m, its construction diversion has the feature of narrow river width, construction layout constraints, big flow magnitude, bed layer and deep memory overhead structure, the design difficulty, etc. The diversion buildings full enclosure or semi enclosed arrangement type of foundation pit, factory late permanent protection, seepage control mode, etc has been considered and three diversion scheme has been put forward, finally chooses decorate of the earth-rock cofferdam along the right bed, whose foundation with geomembrane inclined wall and concrete cut-off wall construction diversion scheme with low risk of the economy and the construction, also easily combined with permanent protective measures.