Nouvelles de l'industrie

At the meeting, Professor Wang Rengui, a national master of engineering survey and design and technical director of China Communications Construction Company Highway Planning and Design Institute Co., Ltd., represented the project team and reported on the project's research background, key innovative technologies, and application of results.

The evaluation experts reviewed the technical documents and, after questioning and discussion, concluded that the project team had conducted in-depth research on the key construction technologies of the 350m high steel box-steel pipe concrete composite cable tower for the 2300m main span suspension bridge, including theoretical analysis, numerical simulation, experimental research, and engineering verification.  The following major innovative achievements were obtained:

1. 1. A new type of cable tower structure composed of a steel box and four built-in steel pipe concrete columns was invented. A reliable connection structure was proposed to ensure the combined stress of the steel box, steel pipe, and concrete. The design is ingenious and the structure is novel. Ultra-large diameter steel pipe concrete time-division quantitative compensation and precise control technology was developed, overcoming technical difficulties in lightweight design, high strength and toughness, and collaborative work of the composite cable tower structure, significantly improving the design and construction level of large-span bridge cable tower structures.
2.  
3. 2. The stress mechanism, non-uniform temperature field action mechanism, and collaborative stress working principle under the composite constraint of the steel box-steel pipe concrete composite cable tower were clarified. A design method for the steel box-steel pipe concrete composite cable tower was established, providing theoretical support and design basis for the construction of the steel box-steel pipe concrete composite cable tower.
4.  
5. 3. An intelligent manufacturing method and digital-physical integrated pre-assembly technology for ultra-large section steel box-steel pipe cable tower segments were proposed. High-precision matching and rapid installation processes and equipment for ultra-large section cable tower segments were developed. Key technologies and devices for preventing segregation during ultra-high drop, large-volume concrete pouring (over 40m) were developed. An industrialized, green, and efficient construction system suitable for composite cable tower structures was established, increasing construction efficiency by over 100%, reducing personnel input by more than 70%, and controlling verticality error within 1/10000.

The project results have obtained 33 authorized invention patents, including 3 PCT international patents, and 35 academic papers have been published. The research findings have been successfully applied to major projects such as the Zhangjinggao Yangtze River Bridge, the Sutong Second River Crossing Project, the Wuhu Taishan Road Yangtze River Bridge, and the Xiamen Third Eastern Channel Project, achieving significant social, economic, and environmental benefits, and demonstrating broad prospects for further application.