A Comprehensive Study On Long Distance Large Diameter Pipe Jacking Engineering Under Complex Geological Conditions

The laying of underground pipes, the pipe jacking construction method is the most common form of a kind of method of underground construction. It can reduce a large amount of earthwork, demolition and save the land for construction, little interference on the surrounding environment, and do not interrupt the advantages of traffic transportation and logistics activities on the ground, in the engineering practice showed higher social and economic benefits, especially suitable for pipeline crossing buildings and roads, rail transit line, even through the channel construction. The mechanical pipe jacking construction in more and more widely used in pipeline construction practice, the main application in the urban water supply and drainage, gas, electricity, construction such as pipelines, communication cable, heat pipe. As the jacking distance constantly be refreshed, pipeline buried depth is more and more deep, combined with different complex and varied geological conditions, underground pipe jacking construction technology is urgent topic deserves attention and consideration.This article in view of the present relatively common in engineering practice and advanced pipe jacking construction technology, the construction process of complex geological conditions, long, deep, large diameter of machinery involved in pipe jacking construction control technology for more in-depth research, combining with the pipe jacking project Dongyue-road in Xi ’an, focusing on mechanical pipe jacking construction technology was optimized. The key technology of mechanical pipe jacking construction such as equipment selection matching and adaptive transform. The process and operation procedures of injecting slurry, relay well setting, measuring control management, between the top into the attitude control and corrective control management and so on has carried on the key analysis research, and combined with the Dong-yue road engineering examples, using the monitoring data, Under the geological conditions collapsible loess in Xi ’an region of the empirical formula of jacking force is deduced.Through the Dong-yue Raod pipe jacking project example, We applied and verify every research content, as well as the deep foundation pit monitoring, Control the process of change in pipe jacking work well. In the process of mechanical pipe jacking construction and analyze the major hazards management. Finally the economical and social benefit of mechanical pipe jacking is analyzed. The engineering provides a large number of theory and practice to long distance, large diameter pipe jacking in Xi ’an in the future.