淠河六安市城南水利枢纽项目一期围堰优化调整及实施

Optimization adjustment and implementation of phase Ⅰ cofferdam of Pi River Lu’an Chengnan water control project

淠河六安市城南水利枢纽项目,从左岸到右岸建筑物依次为左岸连接堤、左岸岸翼墙、36孔节制闸、分流岛、右岸岸翼墙、右岸连接堤。项目分两期导流,在初步设计阶段,一期纵向围堰穿过分流岛,将其一分为二,不利于施工连续性,施工难度较大。同时,施工阶段水位较初设阶段提高2~5 m,外围水位条件发生了根本变化,原围堰体型已经无法满足实际施工需求。因此,在围堰实施阶段,综合考虑工期、造价、施工难度后,第一时间对围堰的轴线、体型进行了优化调整,在降低施工难度、工期可控受控的前提下,采取水下地形测量、过流断面计算、施工方案优化等方法,满足了围堰挡水、右岸导流明渠过流要求,且达到了成本最少的目的。

The buildings from left bank to right bank of Pi River Lu′an Chengnan water control project are left bank connecting dike,left bank wing wall,36 hole sluice,diversion Island,right bank wing wall and right bank connecting dike.The project is divided into two phases of diversion.In the preliminary design stage,the first phase of longitudinal cofferdam passes through the diversion island and divides it into two,which is not conducive to construction continuity and is difficult to construct.At the same time,the water level in the construction stage is 2~5 m higher than that in the initial design stage,the peripheral water level conditions have changed fundamentally,and the shape of the original cofferdam can no longer meet the actual construction needs.Therefore,in the cofferdam implementation stage,after comprehensively considering the construction period,cost and construction difficulty,the axis and shape of the cofferdam are optimized and adjusted at the first time.On the premise of reducing the construction difficulty and controlling the construction period,underwater topographic survey,calculation of overflow section and optimization of construction scheme are adopted to meet the requirements of cofferdam water retaining and overflow of diversion open channel on the right bank,and achieve the goal of minimum cost.