On November 26, with the completion of welding the last span of steel plate composite girder at its bridge location on the Baixi Bridge of the Dezhou-Shangrao Expressway, all main structure construction tasks for steel structure bridges in Section 3 of the Dezhou-Shangrao Expressway steel structure manufacturing contract, undertaken by the Steel Structure Construction Company of China Railway No.4 Engineering Group, were fully completed one month ahead of the planned schedule, laying a solid foundation for the early opening of the Qimen section of the Dezhou-Shangrao Expressway.

According to reports, the Dezhou-Shangrao Expressway is a highway route from Dezhou, Shandong to Shangrao, Jiangxi. It is the western parallel route of the Beijing–Taipei Expressway (National Expressway G3), a capital radial trunk line of China's national expressway network. It generally runs from north to south and is an important highway corridor connecting Shandong, Henan, Anhui and Jiangxi.

The construction scope of Section 3 of the Dezhou-Shangrao Expressway steel structure manufacturing contract is located from Datan Township to Jinzipai Town in Qimen County, Huangshan City. The construction section is 16.51 kilometers long and includes 8 steel plate composite girder bridges and 2 steel box girder bridges, with a total steel consumption of nearly 11,000 tons. It features construction difficulties and key challenges such as "many points and a long line," great difficulty in achieving the finished bridge alignment, and construction across existing expressways.

"The steel plate composite girder construction of the project includes four major processes: steel girder assembly, high-strength bolt tightening, steel girder welding, and paint (anti-corrosion) coating," said Ding He, project manager of the Dezhou-Shangrao Expressway Project Department of the Steel Structure Construction Company of China Railway No.4 Engineering Group. "To ensure smooth connection between processes, we divided the four major processes into sixteen specific processes, refined the construction targets, and reasonably organized construction teams to work simultaneously at multiple points, ensuring that manufacturing and assembly progress met on-site erection requirements."

For assembly operations, the project department adopted an assembly method of first fitting and then reinforcement. Material supply was also refined down to each steel girder, with corresponding materials fully prepared before assembly began. Together, the two methods improved assembly efficiency. For bridge location welding, the project department completed construction organization preparations for the next process before the previous process was finished. Under the premise of ensuring safety and quality, it optimized process connections and increased production efficiency by 20%. Among these, the left span of the Baixi Bridge once set a record of one span every three days, creating the fastest speed for steel plate composite girder erection across all sections of the Dezhou-Shangrao Expressway.

According to Ding He, many bridges in Section 3 of the Dezhou-Shangrao Expressway steel structure manufacturing contract are curved bridges, and ensuring the finished bridge alignment is key to the success of bridge construction. The project department precisely controlled the on-site assembly accuracy of steel plate girders, used jigs for setting out, and projected the designed bridge alignment, camber, and horizontal and vertical curves in three dimensions onto the assembly jigs before carrying out girder segment assembly and installation positioning. The assembly alignment was adjusted according to the manufacturing alignment, interface gaps were adjusted according to process parameters, and positioning stop blocks and limit clamping plates were installed to prevent girder segment displacement from affecting the bridge alignment.