超大管径海底管道长距离岸拖及复杂海况下水平口对接施工技术

摘要

浙江舟山大陆引水三期工程项目面临超大外径 (1.228m) 海底管道长距离 (1.2km) 岸拖以及复杂海况下 (水深12.2m, 流速1.5～2.0m/s) 水平口对接和充水沉管等挑战.提出采用ABAQUS软件模拟岸拖过程中的管道力学状态, 基于SACS软件进行限位桩设计, 采用OFFPIPE软件进行水平口对接计算, 采用AutoPIPE软件进行对接管道充水沉管分析等模拟计算方法, 并创新采用了一种无安装残余应力的水平口对接方法, 成功实现了该项目现场施工顺利完成, 取得了良好的技术成果和经济效益.本文研究成果和施工经验可为后续超大管径海底管道长距离岸拖及水平口对接的设计、施工提供借鉴和参考.%The Third Stage of Zhoushan Water Diversion Project in Zhejiang Province faces the challenges of long distance (1.2km) shore towing of super-large outer diameter (1.228m) submarine pipeline, the tie-in operation under complex sea conditions (water depth of 12.2m, and flow velocity of 1.5～2.0m/s) and the water-filled immersion pipe.The ABAQUS software was used to simulate the mechanical state of pipeline during the process of shore towing, the SACS software-based limit pile design was adopted, and the OFFPIPE software was applied to calculate the tie-in operation.The AutoPIPE software was used to conduct simulations and calculations such as the water-filled immersion pipe analysis of docking pipeline, and an innovation residual stress-free tie-in method was proposed, which ensured the successful on-site construction of this project, and achieved good technical and economic benefits.The research results and construction experiences in this paper will be of great significance and reference for the subsequent long-distance shore towing of super-large outer diameter submarine pipeline, and the design and construction of tie-in operation.