渡槽水毁及其它破坏的修复

Repairing of aqueduct damage by water and other failures

跨越河流、沟谷的渡槽 ,其进、出口段一般为填方渠道 ,如遇超标准大洪水 ,水流溢出渡槽 ,将对渡槽支墩基础和填方区产生冲刷 ,由此造成支承及槽身结构产生倾斜、开裂 ,槽身连接部位发生错动使止水拉裂 ,冲刷严重时可能导致渡槽整体倒塌。分析了水毁渡槽破坏的机理 ,并提出了相应的修复措施 ,如加固渡槽支墩、地基变形的处理、槽身及支承结构裂缝的修补、渗漏问题的处理、表层混凝土剥蚀及钢筋锈蚀的处理等。

The entrance section and the exit section of an aqueduet spanning a river or a gully are generally a channel on embankment.If a major flood surpassing the design standard passes through the aqueduct,the water flow will overtop,resulting in scouring of supporting pier's foundation and the embankment,inclination and cracking of the supporting piers and the aqueduct body,offsetting of the aqueduct connectors,failure of seals.Severe scouring may cause the whole aqueduct to collapse.The mechanism of the aqueduct damage by water is analyzed and corresponding remedial measures are proposed in this paper,for example,strengthening supporting piers,treating foundation deformation cracks of aqueduct body and supporting piers,erosion of surface concrete,and rust of reinforcing bars etc..Every treatment method is presented in detail.