Abstract:  ShenzhenZhongshan link adopts a new technology of underwater integrated push out final joint. To ensure that the welding process is in a waterless environment, an "M water stop + inflatable water stop" is installed between the push out section and the expansion section as a temporary water stop measure during the construction period of the welding section. The inflatable water stop is the second water stop measure and plays a crucial role. The installation space of the final joint inflatable water stop is narrow, and the installation difficulty is high. The inflatable water stop adopts a new method of lifting and positioning the installation with customized tooling parts, and the overall lifting and positioning installation is carried out with customized tooling parts. The process solved the problem of installing ultra long components of inflatable water stop in narrow spaces, improved installation efficiency, and ensured installation quality. Through the field practice of the final joint of ShenzhenZhongshan link, this process can be used for reference in similar projects.

Key words: ShenzhenZhongshan link, final joint, inflatable water stop, water stop, installation technology, immersed tube tunnel