Hangzhou Zhijiang Road Water Pipeline Tunnel and Road Improvement Project
Release time:
2025-12-24
Abstract
Construction unit: Tengda Construction Group, China Railway Tunnel Bureau
Device Number: “China Railway No. 858”
Cutting disc diameter: 15.01 meters
Excavation Length: Zhejiang Provincial Department of Transport—The total length of the project is approximately 6.3 kilometers, of which about 5.6 kilometers are tunnels. Tunnel boring machine (TBM) excavation is the core construction phase. Specifically, the southern tunnel in the western section has an excavation length of 1,231.357 meters, while the northern tunnel in the western section has an excavation length of 1,418 meters. Both main-line TBM tunnels were fully connected on June 18, 2025.
Project Features:
The geological conditions are complex and construction is highly challenging: The tunnel needs to pass through a variety of intricate strata, including weathered quartz sandstone and silty clayey loam. The strength of the hard rock is more than three times that of ordinary concrete, causing extreme wear on the cutter tools. At the same time, the tunnel successfully achieved a tight 650-meter-radius curve, overcoming the significant technical challenges associated with constructing ultra-large-diameter shield tunnels. Additionally, it effectively addressed the risk of uplift during shield tunneling in extremely shallow overburden conditions.
The green, three-dimensional transportation system stands out: Upon completion, it will adopt a “four-lane bidirectional aboveground + four-lane bidirectional underground” configuration. The number of lanes on the ground-level roads will be reduced to widen the riverside landscape belt. In certain sections, sunken roadways will be used to seamlessly connect the park with the Qiantang River. At the same time, the system will integrate water pipeline corridors, thereby simultaneously enhancing both the urban water network and the road network.
Year of commencement: Officially opened in 2019
Year of project completion: October 2025
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