On the morning of the 8th, as firecrackers sounded and on-site workers carried out their tasks methodically, two lifting devices worked in perfect coordination to smoothly complete the removal of the formwork brackets over the Beijing-Shanghai Expressway, marking the successful conclusion of the continuous beam construction crossing the Beijing-Shanghai Expressway, a Level-1 risk point of the Lunan High-Speed Railway.
It is understood that the continuous beam crossing the Beijing-Shanghai Expressway was constructed using the cantilever form traveler method, with a total length of 169.5 m. The 10 m mid-span central section and the 9.75 m end sections of the side spans are constant-depth sections with a beam depth of 3.85 m. Due to its considerable length and the fact that it was constructed above the busiest expressway in China, the project was characterized by high construction process difficulty, great challenges in safety protection, and heavy traffic volume. It was one of the Level-1 risk points in the entire Lunan High-Speed Railway construction and a highly risky and challenging "hard nut to crack" project along the line.
Construction began in May 2017 and successful closure was achieved on December 26 of last year, with a construction period of more than half a year. Throughout the more than 200 days of construction, construction risks were present at every moment. From the very start of the project, the project department always regarded safety protection as the top priority of on-site management and solidly carried out safety protection work for every procedure. To ensure the smooth progress of the project and completion before the milestone, while ensuring no impact or minimizing the impact on the normal passage of vehicles on the expressway, the project department actively organized scheme discussions, prepared and simulated the traffic organization scheme for construction across the expressway, and then had experts conduct rational analysis, demonstration, review, and safety assessment until the final scheme was safe and feasible.
During construction, the project department gradually broke down milestone targets, clarified responsibilities, formulated corrective measures, and effectively solved existing problems. At the same time, it actively negotiated and signed relevant agreements with the local traffic management department to open a green channel for high-speed railway construction and carry out short-term road closures for construction, ensuring the smooth closure of the continuous beam crossing the Beijing-Shanghai Expressway.
The successful conclusion of the continuous beam construction crossing the Beijing-Shanghai Expressway not only successfully eliminated a Level-1 risk along the entire line and opened the beam erection passage toward the Linyi North Grand Bridge on schedule, but also accumulated successful experience for the construction of highly risky and challenging continuous beams crossing rivers and roads.