en.Wedoany.com Reported - Recently, the supporting pump station project for the underpass in the CRRC plot, Hebei District, Tianjin, undertaken by the Housing and Water Electromechanical Project Department of China Railway Sixth Group, achieved a key breakthrough—the pipe-jacking section crossing Zhicheng Road was successfully completed, laying the foundation for the project to be operational before the flood season and ensuring regional safety during the flood period.
According to reports, the maximum excavation depth of this pipe-jacking operation reaches 16 meters, classifying it as a first-level deep foundation pit project. It required traversing between the A22 and A23 bridge piers of the Zhicheng Road Overpass, with a minimum clear distance of only 8.83 meters from the pier foundations. More challenging was the convergence of multiple existing underground utility lines, including water supply and gas pipelines, at this location. Furthermore, the project passes directly beneath a major urban thoroughfare with dense surface traffic, imposing extremely high demands on ground settlement control.
To address this challenge, the team developed a "Multi-source Fusion Dynamic Correction System," which integrates laser guidance data with bridge pier displacement monitoring data in real-time to build a dynamic model. With each ring advanced, the system automatically compares the position against the designed axis and generates correction commands, upgrading traditional manual judgment to intelligent collaborative control. This effectively solved the pain points of insufficient positioning accuracy and response speed when traversing close to bridge piers and pipeline clusters.
Only two work pits were set up on the ground, minimizing the occupation and disturbance of urban space. The jacking process adopted low-speed steady jacking and micro-correction techniques. Through the linkage of laser and monitoring systems, a dynamic response mechanism between jacking speed and ground deformation was established, enabling real-time parameter optimization and proactive risk prevention and control. Actual measurements showed that the maximum horizontal and vertical deviations throughout the entire process were controlled within 20 millimeters, achieving "zero error" in traversing the bridge piers and pipelines.
The supporting pump station project for the CRRC plot underpass is an important component of Tianjin's 2025 Civil Heart Project for flood control and drainage. Once completed, it will effectively enhance the regional stormwater drainage capacity, solving livelihood issues such as underpass flooding and waterlogging during the flood season. This practice of precise large-diameter pipe jacking traversal in a complex environment also accumulates significant technical experience for similar urban underground space development projects.
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