Hangzhou Qingchun Road Cross-River Tunnel
Release time:
2025-12-23
Abstract
Construction unit: China Railway Tunnel Bureau Group Co., Ltd.
Device Number: ("Qiantang River No. 1" Tunnel Boring Machine) French company NFM
Cutting disc diameter: 11.68 meters
Tunneling length: 1766 meters
Project Features:
Among the standout technological innovation projects, a pioneering method—“Liquid Nitrogen Freezing In-Situ Repair of Shield Tunneling Machine Tail Brushes”—has been developed. This breakthrough addresses the persistent challenge of tail brush seal failure in high-pressure aquifer strata, filling a significant gap in the international field. Additionally, a dynamic optimization system for shield tunneling construction parameters has been created, enabling real-time collection of 128 key construction parameters. Other innovations include advanced technologies for continuous treatment of high-pressure groundwater. These efforts have collectively resulted in cost savings exceeding 60 million yuan. The hydrogeological conditions are exceptionally complex, with substantial variations in mechanical properties, which can easily lead to uneven stress distribution and subsidence of the tunneling machine. Moreover, the Qiantang River’s tidal influence is remarkably pronounced, with maximum tidal ranges reaching 5.6 meters and scour depths beneath the riverbed exceeding 7 meters. As a result, the tunnel had to be buried at a depth of up to 37 meters, where the maximum water pressure reaches 0.47 MPa. Furthermore, the presence of marsh gas within the strata adds considerable complexity to the construction process.
Year of commencement: June 2006
Year of completion: December 2010
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