Tuanhe aqueduct, one of the large river-crossing buildings on the main canal of Middle Route Project of South-North Water Diversion, passes through the Tuhanhe River and was planned to be constructed in two phases during dry season. In order to realize the completion target of principal works by the end of 2013, the construction of 16 pre-stressed aqueduct bodies of No. 2~5 sections, located at main channel near right bank of Tuanhe River, was advanced to flood season of 2013. With con-sideration of the changes in current hydraulic conditions, hydraulic calculation and analysis for the construction of two-span steel platform scheme during flood season were carried out. The results showed that the protection scope for the riverbed under the steel platform ranged from 35m upstream of axis to 50m downstream while the toe protection width of bank-head on both sides was 10m.%湍河渡槽是南水北调中线一期工程总干渠的大型跨河建筑物之一,该工程原计划利用枯水期分两期施工,但为实现2013年底主体工程完工的目标,特将右岸主河槽部位2~5号槽16榀槽身调整至2013年汛期施工。为确保汛期施工的安全进行,在考虑施工现状水力条件变化影响的基础上,主要对推荐采用的两联跨钢平台方案进行了汛期施工水力计算分析。结果表明,钢平台下部河床护底范围为轴线上游35 m和下游50 m,两侧堤头护脚防护宽度主10 m,相关计算成果为度汛措施制定提供了理论依据。
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