横沙岛集约化供水工程越江输水管方案比选

Comparison and Selection of River Crossing Pipeline Scheme in Hengsha Island Intensive Water Supply Project

横沙岛集约化供水工程中,将长兴岛上的供水管道延伸至横沙岛需穿越位于长江口的横沙通道,穿越距离约1.7公里。目前能够以非开挖方式一次性穿越如此长距离的技术手段主要包括顶管和水平定向钻进。文中就这两种技术手段提出四种穿越方案进行综合比选,并推荐最优输水管越江方案。

In Hengsha Island intensive water supply project, extending the water supply pipelines from Changxing Island to Hengsha Island needs to cross the Hengsha passage which is located in the Yangtze River Estuary, and the crossing distance is about 1.7 km. There are two technology means including pipe jacking and horizontal directional drilling, which can cross such a long distance without a break at present. In this paper, there are four fiver-crossing schemes based on the two trenchless techniques putting forward to carry out comprehensive comparison and selection and the best one will be recommended.