Pipe Jacking is a type of underwater tunnel construction technique. Below are some key features and steps of pipe jacking:

Features： 

· Suitable for various water environments such as rivers, lakes, and oceans.

· The impact on waterway navigation is relatively minor.

Step：

· Pipe section prefabricationPre-fabricate the immersed pipe sections in a dry dock or factory to ensure their quality and dimensional accuracy.

· Floating transportationTransport prefabricated pipe sections by barge or similar methods to the installation location.

· Submersion matingBy utilizing the buoyancy of water and various control devices, the pipe sections are submerged to the predetermined position at the bottom of the water, followed by the connection and sealing of adjacent pipe sections.

· Basic processingPerform necessary foundation treatment based on geological conditions to ensure the stability of the pipe sections.

· Backfill CoverageAfter completing the section installation, perform backfilling and covering for protective measures.

For instance, the Hong Kong-Zhuhai-Macau Bridge utilized the immersed tube construction technique, successfully constructing a bridge over 50 kilometers long.6.7-kilometer underwater tunnel, the world's longest overall span, longest steel structure bridge, and longest immersed tube tunnel across the sea. The application of immersed tube construction technology makes it possible to build tunnels in complex water environments, providing significant technical support for traffic infrastructure construction.