The sea-crossing municipal cabin of Xiamen Xiangan New Airport project under the Dayong Bridge has been smoothly through on the 5th this month.

The sea-crossing pipe gallery of Xiamen Xiangan New Airport project under the Dayong Bridge is 708 meters long, and trenchless pipe jacking construction technology is adopted. The special reinforced concrete pipe for pipe jacking, with an outer diameter of 3.6 meters, started off the land of Dahuang Island to the land of Xiangan District for receiving. According to the properties of the pipe, it was divided into municipal cabin and power cabin, with two pipeline corridors parallel. At present, the pipe jacking works of the two pipeline galleries are all connected.

According to Wang Xinrong, the project manager of No. 3 Company of the 22nd Bureau of China Railway, the project belongs to the super-long and super-large diameter pipe jacking project. It not only needs to pass through various kinds of residual sandy clay, fully weathered granite and seabed high-strength solitary rocks, but also overcomes many technical difficulties such as seabed foundation treatment, precise positioning of long-distance pipe jacking axis and zero discharge of waste mud.

“In order to achieve penetration, we constantly optimize jacking plan and innovate construction technology” said by Wang Xinrong. The company has developed a high-precision geological exploration technology to achieve precise exploration of underground strong rocks, and developed a composite cutter head mud-water balanced pipe jacking machine specially designed to deal with high-strength solitary rocks. What’s more, the company has innovated a laser precise guidance system, successfully overcome the difficult problem of positioning and measurement of long-distance pipe jacking, and control the he actual error within 5 centimeters.