Application of Liquid Nitrogen Freezing Technology in Pipe Jacking and Obstacle Removal Engineering
With the continuous implementation of municipal and water construction projects in cities,coupled with the existence of many existing above ground and underground buildings/structures,the actual implementation of newly built municipal and water projects will encounter significant difficulties.The protection of existing buildings/structures during the process is extremely important.During the construction of the Lixi main canal of the off-site drainage diversion project at Guangzhou Baiyun International Airport,there was a conflict in elevation between the newly adjusted Bai Guang intercity railway and the existing one.Therefore,the Lixi main canal was designed to pass under the Xinbaiguang intercity railway in the form of a top pipe.During the top-down construction process,an unknown obstacle was encountered that hindered the rotation of the cutterhead,which was located directly below Xinbai Guangzhou intercity railway.After multiple scheme comparisons,liquid nitrogen freezing method was adopted to remove obstacles in front of the machine head.
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