跨河桥梁工程防洪评价关键技术框架与应用

Key Technical Framework and Application of Flood Control Assessment of Crossing Bridges

如何减免河道管理范围内桥梁工程建设对河道防洪的影响,并保证建筑物自身安全是防洪评价工作的重点。通过总结跨河桥梁防洪评价中易出现的问题,提出了一套适合跨河桥梁防洪评价报告编制的结构框架。为进一步定性和定量刻画防洪评价关键技术,从防洪标准、水文成果、河势演变、桥梁布置、壅水影响、桥梁安全、桥下冲刷、三者影响和补救措施等10方面提出了相应的评价内容、评价指标、评价要求、评价方法和评价依据,并将其应用于洮河流域某桥梁防洪评价工作。所提关键技术要点对河道管理范围内跨河桥梁工程的防洪影响评价工作可提供一定的技术参考,同时对指导跨河桥梁工程设计方案优化和项目主管部门审批决策具有重要意义。

How to reduce the impact of bridge construction within the river management scope on flood control of rivers and ensure the safety of buildings is the focus of flood control assessment.By summarizing the problems that are easy to appear in the flood control assessment of crossing bridges,a set of structural framework suitable for the flood control assessment report of crossing bridge is proposed.In order to further characterize and quantify the key technologies of flood control assessment,the evaluation contents,indicators,requirements,methods and basis are correspondingly proposed from the aspects of flood control standards,hydrological results,river evolution,bridge layout,drowning impact,bridge safety,pier scouring,external influence and remedial measures.The technology system is applied to the flood control assessment of a bridge in the Tao River Basin.The key technical points mentioned can provide a certain technical reference for the flood control impact assessment of river crossing bridges within the river management area.At the same time,it is of great significance to guide the optimization of river bridge engineering design and the approval decision of project authorities.