Tianjin Underground Diameter Railway Tunnel
Release time:
2025-12-24
Abstract
Construction unit: China Railway Tunnel Bureau Group Co., Ltd.
Device Number: (“ Zhenwu Ship Shield machine ) France's NFM and Northern Heavy Industries Joint Venture
Cutting disc diameter: 11.97 meters
Tunneling length: 2146 meters
Project Features:
The project is located in the core urban area of Tianjin and spans across three administrative districts. It crosses two major rivers—the Haihe River and the South Canal—and also passes beneath several bridges, including the planned Metro Lines 4 and 6, as well as the Shizilin Bridge and the Jin Gang Bridge. The tunnel’s maximum burial depth reaches approximately 43 meters. Remarkably, it traversed major rivers and waterways under ultra-shallow overburden conditions, where the effective soil layer thickness was less than 4 meters. For the first time in China, the BEAM system technology was employed for advanced geological exploration, enabling proactive identification and mitigation of geological risks. The slurry treatment system integrates a three-stage treatment process that combines U.S.-designed hydrocyclone equipment with Spanish separation technology, achieving zero discharge of slurry waste and fully complying with environmental protection requirements. During tunnel boring machine (TBM) launch, a closed-loop hard-interlocking pile reinforcement technique was adopted. Additionally, the project successfully overcame technical challenges such as extracting large-diameter bored piles in confined spaces.
Year of commencement: February 2009
Year of completion: December 2013
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