en.Wedoany.com Reported - On June 4, the (40+56+40) meter continuous beam of the Ji-Zao Railway bridge crossing the Yanshi railway, constructed by China Railway No.5 Engineering Group (CREC-5), was successfully closed at the mid-span, marking a phased victory in the bridge construction of CREC-5's JZTJ-2 section and opening a key channel for subsequent girder erection.
The bridge crossing the Yanshi railway has a total length of 16,224.479 meters and comprises three continuous beam units. The closed continuous beam is a single-box single-chamber variable cross-section box girder with a deck width of 12.6 meters, constructed using the form traveler cantilever casting method. The 0# block and side-span straight sections were cast in place using spiral steel pipe supports, while standard beam segments were cast using form traveler cantilevers. The closure was completed in the sequence of side spans first, followed by the mid-span. This continuous beam spans the busy G327 national highway and runs parallel to the Beijing-Shanghai High-Speed Railway with a spacing of less than 55 meters. Construction had to ensure the safe operation of both the Beijing-Shanghai High-Speed Railway and the national highway, posing significant challenges in construction organization and high safety risks.
To address this, CREC-5 builders organized expert reviews of the specialized construction plan in advance, comprehensively broke down construction procedures, and proactively identified various safety hazards such as high-altitude operations, cross-road construction, and construction near high-speed railways. During construction, the project department effectively strengthened coordination and communication with railway and highway management authorities, strictly implemented all railway and highway safety measures, detailed graded safety technical briefings, and arranged dedicated personnel for round-the-clock on-site monitoring, ensuring the safety of railway operations and national highway traffic. To guarantee closure accuracy and project quality, the project department deployed an automated beam alignment intelligent monitoring system throughout the process, collecting key data such as beam axis deviation, elevation changes, and prestress tensioning in real time, dynamically adjusting construction process parameters, and precisely controlling closure temperature and timing, ultimately achieving millimeter-level precise closure of the beam and successfully meeting both safety and quality control objectives.
As an important tourism corridor in Shandong Province's "eight vertical and six horizontal" high-speed railway network, the Ji-Zao Railway has a total length of 268.48 kilometers and a design speed of 350 kilometers per hour, with 10 stations including Jinan East, Nanshan, Tai'an East, Ningyang East, Tengzhou East, and Taierzhuang. Upon completion, the project will interconnect with the Rizhao-Lankao High-Speed Railway, Jinan-Qingdao High-Speed Railway, Qingdao-Jinan Passenger Dedicated Line, and Jinan-Binzhou High-Speed Railway, opening a fast channel between the provincial capital economic circle and the southern Shandong economic circle, which is of great significance for building a "rail-based Shandong" and supporting and driving the province's high-quality economic development.
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