Section 2, North Line of the Hangzhou Ring City North Road - Tianmushan Road Improvement and Renovation Project
Release time:
2025-12-24
Abstract
Construction unit: China Railway Tunnel Bureau Group Co., Ltd.
Device Number: ("Chuxin No. 1" Tunnel Boring Machine) China Railway Equipment
Cutting disc diameter: 13.46 meters
Tunneling length: 1770 meters
Project Features:
High Construction Risks in the Core Urban Area: The project section is located in the Wulin Square commercial district, where buildings are densely packed and underground utility lines are intricately intertwined. The project involves relocating 13 power circuits of 35 kV and above, as well as 55 circuits of 10 kV. Additionally, the construction requires passing beneath multiple waterways, including Metro Line 2, Metro Line 10, and the Guxin River. In total, the project faces dozens of high-risk construction sites, making it extremely challenging to control ground settlement. Significant Equipment and Construction Challenges: The transportation, assembly, and installation of the ultra-large tunnel boring machine—measuring 13.46 meters in diameter—pose extraordinary difficulties. The equipment bridge alone is 23 meters long and weighs 68 tons. Meanwhile, the project has required coordinating numerous traffic diversions, totaling more than 30 such diversions. During construction, efforts have been made to minimize disruption to traffic flow in the city center. Highly Adaptable Construction Methodology: To address the complex and variable geological conditions along the route, the project innovatively adopted a slurry balance tunneling method. This technique enables precise control over ground disturbance during excavation and, combined with advanced construction technologies, achieves an average daily advance rate of 4 meters, ensuring both construction progress and the safety of nearby facilities.
Year of commencement: October 2020
Year of completion: August 2023
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