On the afternoon of December 26, at a construction point in the Yangtze River about 380 meters from the south bank levee in the Chizhou section of the Yangtze, as the last batch of base-sealing concrete was poured into the cofferdam of Pier No. 4 of the Chizhou Yangtze River Highway-Railway Bridge, the cofferdam base-sealing for the No. 4 main pier of the Chizhou Yangtze River Highway-Railway Bridge, constructed by China Railway Major Bridge Engineering Group, was successfully completed. This marks that the Chizhou Yangtze River Highway-Railway Bridge is about to enter the construction stage of the main pier pile cap, laying a solid foundation for the construction of the main tower of the Chizhou Yangtze River Highway-Railway Bridge.

The Chizhou Yangtze River Highway-Railway Bridge connects Guichi District of Chizhou City and Zongyang County of Tongling City, with a total length of 3.1 kilometers, of which the main bridge is 1,768 meters long. It is a three-main-truss, three-cable-plane double-deck steel truss cable-stayed bridge with a span arrangement of (100+378+812+364+114) meters. The south cable tower of the bridge is 274.5 meters high, and the north cable tower is 282.5 meters high. Both are elegantly shaped spatial diamond-type reinforced concrete bridge towers, enjoying the reputation of the "Bridge in the Sky."

It is reported that the cofferdam of Pier No. 4 for this base-sealing construction is a double-wall steel boxed cofferdam, with a plan dimension of 80.2 meters × 52.2 meters and a height of 25 meters, its area equivalent to 10 standard basketball courts. The base-sealing of this cofferdam was carried out entirely underwater, with a total designed volume of 13,005 cubic meters, making it the first main pier cofferdam in the entire bridge to undergo base-sealing construction. "The first pour adopted the ball-pulling method, and subsequent pours adopted the pipe-insertion method. The reasonable combination of these two processes greatly improved work efficiency while ensuring construction stability," introduced a relevant person in charge from China Railway Major Bridge Engineering Group. This was the third and final base-sealing for the No. 4 pier cofferdam. After the base-sealing is completed, the river water will be completely isolated by the cofferdam, creating "dry construction" conditions for the large-volume concrete pouring of the pier pile cap.

The Chizhou Yangtze River Highway-Railway Bridge features long spans, heavy loads, and high speed, and is built to the standard of a combined river crossing for "highway + intercity railway + urban rail transit." The upper deck serves as the river crossing channel for the Ningzong Expressway, arranged with six lanes in both directions and a design speed of 100 kilometers per hour; the lower deck carries the two-track Hechi Intercity Railway with a design speed of 250 kilometers per hour, and reserves two tracks for the Chizhou-Tongling regional railway with a design speed of 160 kilometers per hour.

The Chizhou Yangtze River Highway-Railway Bridge is a controlling project for the entire Hefei-Chizhou Intercity Railway, which is about to commence construction. It is about 24 kilometers upstream from the Chizhou Yangtze River Highway Bridge and about 20 kilometers downstream from the Tongling Yangtze River Highway Bridge. After the bridge is completed and put into operation, it will become the sixth highway-railway bridge crossing the Yangtze River in Anhui Province, following the Wuhu Yangtze River Bridge, the Tongling Yangtze River Highway-Railway Bridge, the Third Wuhu Yangtze River Bridge, as well as the under-construction Ma'anshan Yangtze River Highway-Railway Bridge and the G3 Tongling Yangtze River Highway-Railway Bridge.

After the Hefei-Chizhou Intercity Railway and the Chizhou Yangtze River Highway-Railway Bridge are completed and put into operation, they will open up transportation channels such as highways and intercity railways from Hefei through Chizhou to southern Anhui. Passengers traveling between Hefei and Chizhou by EMU trains will be able to reach their destinations quickly and directly without detouring through Tongling, Anqing, and other places. This is of great significance for further strengthening infrastructure construction in the Wanjiang region, improving the layout of river crossing channels, and advancing the implementation of the Yangtze River Delta integration development strategy.