为解决沉管隧道传统陆域现浇最终接头端部止退措施水下作业多、工序复杂、质量把控难等技术难题，基于襄阳鱼梁洲汉江沉管隧道陆域最终接头，开展不设独立止退构造、利用管节摩擦力止退的陆域最终接头的研究，取得以下成果： 1）开展室内试验和现场试验，得到卵石基床和沉管隧道之间的摩擦因数和考虑回淤影响的卵石基床和沉管隧道之间的摩擦因数； 2）研究最终接头摩擦力止退原理，首次研发采用摩擦止退型沉管隧道陆域最终接头，取消端部额外止退构造，采用预应力粗钢筋作为临时连接措施，并设置自润滑推力轴承来消除剪力。经过工程实际验证，连接措施受力及管节接头张合量均满足要求，采用摩擦止退型沉管隧道陆域最终接头安全可靠。
There are many technical difficulties in antireaction
construction of castinplace
onland final joints of immersed tunnels, i.e., multiple underwater operations,
complex procedures, and quality control. Therefore, a case study is conducted
on the Hanjiang rivercrossing immersed tunnel in
Yuliangzhou, Xingyang, China. No independent antireaction structure is
arranged, and the friction of the pipe joint is used as antireaction function.
The results demonstrate the following: (1) The friction coefficient between
pebble foundation bed and immersed tunnel and the friction coefficient between
pebble foundation bed and immersed tunnel considering the influence of backsilting are obtained by laboratory and field tests. (2) The
principle of friction antireaction of the final joint is studied, the land
final joint of the immersed tunnel with friction antireaction is developed for
the first time, the end antireaction structure is eliminated, prestressed
coarse reinforcement is adopted as a temporary connection measure, and selflubricating thrust bearing is set up to eliminate the shear force.
The engineering practice validates that the force and the tensioning amount of
the pipe joint meet the requirements, and the land final joint of immersed pipe
tunnel with frictionantireaction is safe and reliable.
