天津市疏港联络线8座桥梁建设的防洪影响分析

Analysis of flood control of eight bridge construction affected Tianjin Port contact line

本文通过对天津市滨海新区疏港联络线8座桥梁建设进行防洪影响分析,主要内容包括建设项目布置型式分析、壅水分析计算、冲刷分析计算、梁底高程分析计算和防洪影响综合评价等[1]。通过分析计算得出,桥前壅水发生在近桥附近,对下游河道流速、流势的影响较小;跨河桥梁实施以后,桥位处的流速变化不大,对水流流向不会产生较大影响。桥墩局部冲刷深度较小,对总体河势基本不产生影响。同时,为减轻壅水和冲刷造成的影响,提出一些处理措施。

Based on analysis of flood control of 8 bridge construction in the contact line of the Port in Tianjin Binhai New Area,the main contents includes the construction project layout pattern analysis and comprehen-sive evaluation analysis and calculation of backwater ,scour analysis and calculation ,calculation and analysis of the impact on beam bottom elevation of flood control.Through the analysis calculates that took place near the front axle backwater near the bridge,a smaller impact on downstream river flow rates,flow potential;subse-quent implementation crossing bridge ,the bridge located at a flow rate of change is unlikely ,the flow of water will not produce more impact.Pier local scour depth is small ,basically no impact on the overall river regime. Meanwhile,to mitigate the effects of erosion caused by backwater and make some treatment measures.