长距离复杂航线下沉管管节拖航研究

Research on Towing Issues of Immersed Tunnel Elements on Long-distance and Complex Route

外海沉管管节安装的施工窗口期短,海洋环境复杂多变,为保证拖航过程中管节的安全可控,需要研究拖航编队航行过程中在风、浪、流作用下的运动响应,并需考虑风、浪、流产生的横向偏移力对管节编队产生的偏航效应,同时分析拖轮对管节编队的纠偏能力。文章以深中通道S08合同段管节浮运施工为例,以某节管的计算实例介绍了管节在长距离复杂航线下拖航过程中下沉量分析的数值计算方法,并结合经验公式对计算结果进行了验证;以该管节的运动响应分析,提出了一种适用于管节拖航过程中的纠偏分析程序并针对具体问题给出了相应的控制措施。

The construction window period of offshore immersed tunnel elements is short and the ocean environ⁃ment is complex and changeable.In order to ensure the safety and control of the tunnel elements during the towing process,it is necessary to study the motion response of the immersed tunnel elements under the action of the wind,waves and currents during the towing formation navigation,consider the yawing effect of the lateral deviation force generated by the wind,waves and currents on the tunnel element formation,and analyze the ability of the tugboat to correct the deviation of the tunnel element formation.Taking the floating of the tunnel elements of the lot S08 of the Shenzhen-Zhongshan sea-crossing project as an example,it introduces a numerical calculation method for the analy⁃sis of the squat of the tunnel elements during the towing process on long-distance and complex route through the cal⁃culation example of a certain tunnel element,and validates the calculation results through empirical formulas.Through the analysis of the motion response of the tunnel element,this paper proposes a deviation correction analy⁃sis procedure applicable for the towing process of the tunnel element and offers the corresponding control measures for related specific problems.