天津海河沉管隧道管段分节方案比选研究

Study on Scheme Comparison and Selection of Pipe Section of Tianjin Haihe River Immersed Tunnel

天津中央大道海河隧道为北方地区首座沉管法施工的隧道。该文分别从管段平面形态、河床形态与航道要求、干舷高度、拖运沉放、干坞规模及管段接头位置等多方面比较了不同管段分节方案的优缺点。分析表明,两节管段方案在接头数量和干舷高度等方面有优势,而三节管段方案在沉管管段浮运和干坞选址方面具有明显优势。最后通过综合比较,推荐采用三节管段方案作为工程实施方案。

Tianjin Central Avenue Haihe River Tunnel is the first tunnel constructed by the immersed tunneling method in the northern area.The article compares the advantages and disadvantages of the different pipe section schemes from the aspects of the pipe section plane shape,riverbed shape and channel requirement,freeboard height,hauling sinking,dry dock scale and pipe section join position.The result shows that the two-section pipe scheme has the advantage of the join quantity and freeboard height,and the three-section pipe scheme has the obvious advantage of immersed pipe floating hauling and the dry dock site selection.By the comprehensive comparison,the three-section pipe scheme is finally recommended as the engineering implementation scheme.