The scientific and technological field of the project: Tunnel and underground engineering
Main technological innovation contents:

1. Development of ultra-large diameter pipe jacking machine
   The pipe jacking machine is the key equipment in pipe jacking construction. According to the construction conditions of this project, a φ4.64m ultra-large diameter pipe jacking machine was successfully developed. Its reliability and stability directly affect the construction progress and cost.
2. Research on automatic measurement and guidance technology for S-shaped curve pipe jacking
   Based on wireless and relay data transmission technology, an automatic measurement guidance system with independent intellectual property rights has been developed, which can quickly provide accurate guidance data, improve work efficiency, and solve long-distance S-curve pipe jacking measurement problems.
3. Research on long-distance pipe jacking dry mud transportation technology
   By improving the characteristics of muck, using pump pipes lined with polytetrafluoroethylene drag reduction and relay pumping technology, long-distance continuous transportation of dry mud is achieved, which is conducive to environmental protection.
4. Research on long-distance pipe jacking control technology
   By optimizing the property of thixotropic mud and setting up a detachable steel-concrete combination relay room, smooth jacking of large-diameter and long-distance pipe pipes is achieved.
   Intellectual property rights: Relying on this project, a total of 11 national patents have been obtained, including 5 invention patents and 6 utility model patents.
   Application promotion situation:
   The φ4.64m ultra-large diameter long-distance S-shaped curve pipe jacking in the southern line transmission trunk line improvement project in the Bailonggang area of Shanghai City is the first time in the world. It is characterized by high difficulty in construction and high risk. Through this research, a φ4.64m full-section earth pressure balance pipe jacking machine was developed, and a complete set of earth pressure balance pipe jacking construction technologies were applied, including automatic measurement and guidance, mud resistance reduction, combined relay room, dry mud transportation and other technologies. The construction problem of large-diameter (φ4.64m), long-distance, curved pipe jacking through soft soil layers was solved. This achievement has a series of advantages such as reliable technical performance, high work efficiency, and good safety performance. Applying it to underground sewage treatment projects not only enriches underground pipeline construction technology, but also achieves good social and economic benefits, and has high promotion and application value and broad technical and economic prospects.