After years of development, pipe jacking technology has been widely used in practical projects in China, and maintained a high-speed growth momentum. Great progress has been made in technology, pipe jacking equipment and construction technology, and even reached the world leading level in some aspects. 200 1, Shanghai Tunnel Co., Ltd. completed the reinforced concrete pipe jacking project with a length of 2050m and a diameter of 2m in Changzhou, Jiangsu Province, which is the longest pipe jacking project in China. From August 5438+0, 2006 to February 5438+0, 2006, Jiaxing sewage disposal project jacked a 2050m long reinforced concrete pipe jacking. Due to the selection of reasonable pipe jacking machine type, the technical problems such as the application of drag reduction mud and axis control were successfully solved, and all jacking construction was completed in about 5 months, creating a new pipe jacking construction record. The steel pipe with a total length of 3600m and a diameter of 1.8m successfully crossed the Yellow River 23-25 meters underground in September 2002, which is the first time in China in terms of jacking length, buried depth, geological conditions and steel pipe diameter. The longest section is located on the main riverbed of the Yellow River, with a length of 1.259 m, and it has to cross the thick gravel sand layer and the main channel of the Yellow River. It is not only the key project of west-to-east gas transmission in China, but also the longest large-diameter steel pipe jacking project in the world under complex geological conditions. In the sewage treatment project of 200 1 shangyu city, glass fiber sand pipe was successfully applied to pipe jacking construction for the first time. In Wuxi Yangtze River Water Diversion Project in 2008, China Railway No.10 Bureau and No.10 Company used domestic equipment with 2200mm diameter steel pipes and double pipes to propel 2,500 meters synchronously. All the above projects indicate that the level of pipe jacking construction in China has reached a new height and is getting closer to the advanced level in the world. However, compared with foreign developed countries, such as Japan, Germany and other advanced mechanical equipment and construction technology, China still has obvious gap.