Micro tunneling technique, or pipe jacking construction is a less excavation or excavation of pipeline buried construction technology. Pipe jacking construction is to work in a pit with the help of the jacking device to produce jacking force, to overcome the friction of the soil around pipeline and, the pipeline according to the design of slope in the grave, and will be the earth away. The section tube to finish top soil layer, and then the second section continues into the pipe. Its principle is by means of the main oil cylinder and pipe, relay rooms such as thrust, pit or machine tool tube from work through the soil has been promoting the receiving pit lift. After pipe after tool or machine, buried between two pits.

Micro tunneling technique is a kind of Trenchless engineering solved the pipeline buried to the destruction of the city buildings during construction and road traffic jams, shows its advantage in a stable soil and environmental protection. The heavy traffic, densely populated, the ground buildings and underground pipeline complex city is very important, it will create a clean, comfortable and good for the city environment.

Trenchless technology is in recent years began to frequent use of a term, it involves the use of less excavation, which work well and receive well excavation, and excavation, the pipeline is the excavation technology for underground pipeline laying or replacement, diameter of machine in micro tunneling technique is about DN800-4500. Through work well to bury the pipe roof and the grave, a pipe can be in underground work well through more than 1500 meters, and also can curve, to bypass some of the underground pipeline or obstacles.