On March 25, 2023, at the construction site in the middle of the river about 380 meters away from the embankment on the south bank of the Chizhou section of the Yangtze River, a XR800HD large-tonnage rotary drilling rig rumblingly started. China Railway Bridge Survey and Design Institute Anhui Provincial Transportation Planning and Design Research Institute designed the China Railway Bridge The drilling of the first pier of the Chizhou Yangtze River Highway-Railway Bridge undertaken by the bureau marks the full start of the main project of the bridge.

Chizhou Changjiang 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 and the main span is 812 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 beautifully shaped space diamond-shaped reinforced concrete bridge towers, known as the bridge of the sky.

The Chizhou Yangtze River Highway-Railway Bridge has the characteristics of long span, heavy load, and high speed. The upper layer serves as the river-crossing channel of the Ningsong Expressway, which is arranged in two directions with 6 lanes, with a design speed of 100 kilometers per hour; the lower layer carries two lines of Hechi Intercity Railway, with a design speed of 250 kilometers per hour; two lines of Chitong City Railway are reserved, with a design speed of 160 kilometers per hour .

The foundation of the No. 4 main pier of the bridge was drilled on the same day, using 77 bored piles with a diameter of 2.8 meters. The pile foundation was designed according to friction piles, and the weakly weathered silty mudstone was used as the bearing layer. The pile length was 112 meters and the concrete volume of the single pile was designed. The special geological and hydrological conditions of 689 cubic meters and the construction characteristics of ultra-long and ultra-deep bored piles have brought great impact on construction operations such as platform steel pipe piles and steel casings to build reinforcement cages, lengthening, and lowering underwater concrete pouring foundation piles for ultrasonic testing. to a certain degree of difficulty

In order to ensure the smooth drilling of the first bored pile, the construction management unit Anhui Jiangxi Railway Anhui Company, together with the construction unit China Railway Bridge Bureau, adhered to the construction concept of "fulfilled mission, hard work, scientific order, safety and high quality". Started with high standards and built with high quality Compilation of a standardized operation instruction manual, fully equipped with strong personnel and equipment, implementation of fine-graining technology, safety disclosure, strict operation process and construction discipline, adoption of the world's advanced rotary drilling technology, organization of operations in strict accordance with construction process requirements, and ensuring the first bored pile of the first main pier spud

The Chizhou Yangtze River Highway and Railway Bridge is a control project for the entire line of the Hefei-Chizhou intercity railway. The upstream is about 24 kilometers away from the Chizhou Yangtze River Highway Bridge, and the downstream is about 20 kilometers away from the Tongling Yangtze River Highway Bridge. After the bridge is completed and put into operation, it will become the sixth bridge crossing the Yangtze River in Anhui Province after Wuhu Yangtze River Bridge, Tongling Yangtze River Railway Bridge, Wuhu Yangtze River Third Bridge, Ma'anshan Yangtze River Railway Bridge and G3 Tongling Yangtze River Railway Bridge. Railway Bridge.

After the Hefei-Chizhou Intercity Railway and the Chizhou Yangtze River Highway and Railway Bridge are completed and put into operation, the roads and intercity railways between Hefei and Chizhou to southern Anhui will be opened up. Hefei and Chizhou can be quickly and directly reached by EMU trains without detours in Tongling , Anqing and other places are of great significance for further strengthening the infrastructure construction of the Wanjiang River region, improving the layout of the crossing channel, and promoting the implementation of the integrated development strategy of the Yangtze River Delta.(Editor/Wang Yan)