Non-Excavating Horizontal Directional Drilling Applied in the 2nd Phase Project of Feed Pipelines Expansion in Xi'an City, China

The 2nd phase Project of Feed Pipelines Expansion in Xi'an City, China is the key program for urban construction in 2011 for Shaanxi Province. The to-be-expanded pipelines are also the main ones supplying water for Xi'an International Horticultural Expo, which has attracted high attention from municipal leaders and all sectors of society. The directional drilling project (2,270 m long with a steel pipe specification of Φ1220mm × 14mm) is located at Dongyue Road of C section affiliated to the expansion is the most difficult one and determines the whole program. In this paper, discussions and summaries are made for key technologies and techniques on non-excavating horizontal directional drilling based on project practices so as to provide reference for similar projects.