The "2016 China Urban Underground Comprehensive Utility Tunnel Planning, Design and Construction Key Technology Forum" was held at the Zhongtu Mansion in Beijing from May 7 to 8, 2016.
　　 The main content exchanged at this forum included the planning, design, construction and maintenance of urban underground utility tunnels, the latest urban underground utility tunnel planning and design specifications and new construction technologies, and interpretations of relevant national policies and regulations. The content was closely tied to national industrial policies and was highly targeted, broad in coverage and focused on key points. About 350 representatives from across the country attended the forum, and Xuzhou Dun'an Heavy Industry made a stunning appearance at the forum as a co-organizer.
​　　 As a setter of industry standards, the full-slewing drilling rigs produced by Dun'an Heavy Industry have been widely used in recent years in projects such as urban subways, secant piles for deep foundation pit retaining walls, removal of abandoned piles (underground obstacles), construction of high-speed railway, road and bridge, and urban construction piles, and reinforcement of reservoirs and dams. They can better meet the needs of pile foundation construction such as diaphragm walls, secant piles and vertical shafts in underground comprehensive utility tunnel construction. At the meeting, many customers came specifically to make related inquiries and gave unanimous praise to the full-slewing drilling rigs developed and produced by Dun'an Heavy Industry.
　　 The full-casing full-slewing drilling rig developed and manufactured by Dun'an Heavy Industry has a maximum construction pile diameter of 3200 mm and a maximum drilling depth of more than 120 m. It features extremely high vertical accuracy, can successfully complete construction in various complex geological environments such as quicksand, karst caves, rock formations, cobbles and reinforced concrete components, and can ensure rapid construction. If complex geology cannot be penetrated, the machine can smoothly remove obstacles.