On January 18, the "Jincheng No. 1" shield tunneling machine for the Tianjin-Weifang High-Speed Railway officially launched at the Jingu Haihe River Tunnel in Binhai New Area.

On January 18, with the smooth launch of the super-large-diameter shield tunneling machine "Jincheng No. 1" for the Jingu Haihe River Tunnel of the Tianjin-Weifang High-Speed Railway, constructed by China Railway 14th Bureau Group, the high-speed railway shield tunnel with the largest excavation diameter and the longest tunneling distance in the Beijing-Tianjin-Hebei region officially began tunneling. This marks the comprehensive acceleration of construction of the Jingu Haihe River Tunnel on the Tianjin-Weifang High-Speed Railway, with the entire line planned to be completed and opened to traffic in 2027.

The Jingu Haihe River Tunnel has a total length of approximately 6.7 kilometers and is the **only shield tunnel** on the entire Tianjin-Weifang High-Speed Railway line. The "Jincheng No. 1" shield tunneling machine has a total length of about 120 meters and a total weight of about 3,200 tons. It features a livery inspired by the "Ruyi Jingu Bang" (the legendary golden cudgel), a pun on the name "Jingu." During tunneling, the shield machine will pass beneath a series of major risk sources, including water-rich and soft strata with strong liquefaction potential and other unfavorable geological conditions, as well as the Central Avenue Overpass, the Southwest Ring Railway, and the Haihe River, posing great construction challenges. In addition, the tunnel will pass beneath salt fields right from the launch point. The strata in the salt pond area have a high salt content, with corrosive ion levels approximately 160 times those of a normal geological environment, placing extremely high demands on the corrosion resistance and stability of the shield equipment and reinforced concrete.

According to reports, the "Jincheng No. 1" shield tunneling machine is equipped with a synchronous dual-fluid grouting system, a main drive telescopic system, and a synchronous pushing-and-segment-assembly system, improving construction efficiency by up to 40% compared with traditional shield machines. At the same time, the construction contractor has also carried out anti-corrosion modifications and targeted designs for the equipment, optimized the reinforced concrete mix ratio, applied anti-corrosion coating materials, and adopted a full-envelope waterproofing process. This enables safe passage through highly corrosive strata and ensures the safety, reliability, and long service life of the tunnel.