输水管道穿越跨海长堤设计方案比选与探讨

Comparison and Discussion on the Design Scheme of Water Conveyance Pipeline Crossing a Long Sea Dyke

温州洞头陆域引供水工程管道穿越灵霓大堤长度达14.5 km,是典型的输水管道穿越跨海长堤。结合大堤结构,从管道路由选择、施工难度、大堤影响、维护检修及工程造价等方面对管道穿越大堤方案进行了充分的比较,并选择了结合海堤顶部道路防护墙设置管槽进行敷设的穿越方案。采用植筋、抗滑齿墙、管道"蛇"型布置及端部各两个角向补偿器形成铰接链杆的方法解决了管槽结构稳定、管道沉降、热胀冷缩问题。工程建设及运行效果良好,表明方案合理可行,可为类似工程提供经验借鉴。

The length of water conveyance pipeline crossing the Lingni sea dyke of water diversion project in Dongtou of Wenzhou reaches 14.5 kilometers, which is a typical water pipeline crossing the sea dyke. Combined with the structure of dyke, the scheme of pipeline is compared in the aspects of the route selection, construction difficulty, influence of the sea dyke, maintenance and the project cost etc., the crossing program of pipe groove with road protective wall at the top of the seawall was selected. The struc- tural stability, settlement, thermal expansion and cold shrinkage problems were solved by reinforcement planting, anti-slide key-wall, groove sand filling and splice chain pole formed of two angle compensator methods. The good results of the construction and operation showed that the program was reasonable and feasible, which provided experience for similar projects.