顶进节段法最终接头工艺研究及应用

Research and application of the final joint process using the segment-jacking method

最终接头作为海底沉管隧道工程贯通管节,是整个工程的重中之重。结合大连湾海底隧道工程的特点及难点,调研现有的国内外沉管隧道最终接头的施工案例,开展顶进节段法最终接头工艺顶推回拉系统、纠偏系统、锁定系统、双层止水系统、施工工艺5项关键技术的研究及水下抗浮、回拉2项受力计算。经大连湾海底隧道最终接头施工验证,该工艺施工操作方便,施工周期短,船机设备投入少,造价低,施工工艺具有可逆性。顶进节段法最终接头在技术先进性、安全可靠性和经济效益等方面具有极大优势,可推广应用于类似沉管隧道工程中,具有显著的经济和社会效益。

The final joint,as the connecting pipe joint of the submarine immersed tunnel project,is the top priority of the entire project.Combined with the characteristics and difficulties of the Dalian Bay Subsea Tunnel Project,the existing construction cases of the final joint of immersed tube tunnels at home and abroad were investigated,and five key technologies of the final joint process of the segment-jacking method were studied,including the jacking and pulling back system,the deviation correction system,the locking system,the double-layer water stop system,and the construction process,and the calculation of forces on underwater anti floating and pull-back were carried out.The construction verification of the final joint of Dalian Bay subsea tunnel shows that this process is convenient to operate,short in construction period,low in investment of ship machinery and equipment,low in cost,and reversible in construction technology.The final joint of segment-jacking method has great advantages in terms of technical advancement,safety reliability and economic benefits,which can be applied in similar immersed tunnel projects,with significant economic and social benefits.