Hangzhou North Ring Road Underground Passage
Release time:
2025-12-24
Abstract
Construction unit: China Railway Tunnel Corporation
Device Number: ("Canal No. 1" Tunnel Boring Machine) French company NFM
Cutting disc diameter: 11.65 meters
Tunneling length: 1410 meters
Project Features:
Record-breaking Construction of an Ultra-Shallow, Large-Diameter Shield Tunnel: This project marks Hangzhou’s first urban tunnel constructed using the large-diameter shield method. The cutterhead diameter of the shield machine employed in this project reaches 11.3 meters. Even more exceptional is that the shield’s launch point is only 3.4 meters above ground—a condition that ranks among the world’s rarest examples of ultra-shallow burial, placing extremely high demands on excavation accuracy and surface settlement control. Meanwhile, the tunnel’s maximum designed gradient reaches 5.5%, and the ground conditions at both the shield’s launching and receiving ends are highly permeable with abundant groundwater, further complicating the construction techniques. Dense Crossing of Sensitive Structures: During construction, the tunnel must continuously pass beneath several high-risk areas, including the Donghe River, Tiesha River, the Shanghai-Hangzhou Railway, the Zhanlongkou Underpass, and the Bazi Bridge over the Donghe River. High Coordination Challenges in Downtown Areas: The project route traverses numerous residential districts—including Shuixingge Community and Zhanlongkou New Village—along with a dense network of underground utilities. In addition to adopting phased construction methods and temporarily removing portions of the segregated pedestrian and bicycle green belts and bus stops, the construction team must also carefully manage the impact of construction noise and dust on nearby residents.
Year of commencement: June 2013
Year of completion: October 2015
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