Core Viewpoint - The inspection and maintenance of the Hukun High-speed Railway Xiangjiang Grand Bridge are crucial for ensuring the safety of high-speed rail and shipping, especially during the busy Spring Festival travel period. Group 1: Inspection Process - The Hukun High-speed Railway Xiangjiang Grand Bridge spans approximately 4500 meters and is a key navigational bridge on the Xiangjiang River [1] - The inspection team utilizes advanced technologies such as unmanned detection boats, drones, and underwater robots to conduct thorough checks of the bridge's external environment and structure [1][2] - The use of unmanned detection boats enhances safety and efficiency, allowing for high-precision measurements of the riverbed and reducing the risks associated with underwater operations [1] Group 2: Technological Advancements - Drones are employed to inspect hard-to-reach areas of the bridge, capturing detailed images of potential structural issues such as concrete cracks and rust on steel structures [2] - Underwater robots can operate in turbulent waters and reach depths of over 200 meters, effectively covering traditional inspection blind spots [2] - The overall inspection time has been significantly reduced from a full day to just two hours, while also providing more accurate data to ensure traffic safety during peak travel times [2]

Core Viewpoint - The article highlights the critical maintenance and inspection work being conducted on the Wangjiakou Grand Bridge, part of the Xi'an-Yan'an High-Speed Railway, emphasizing the bridge's significant structural features and the dedication of the workers involved in ensuring its safety before the railway's opening in December 2025 [1][2][4]. Group 1: Bridge Specifications and Importance - The Wangjiakou Grand Bridge is noted as the largest and highest no-ballast track bridge in China's high-speed rail network, with a height of 150 meters, equivalent to a 50-story building [1]. - The bridge spans a total length of 1,066.7 meters, with specific attention to the main arch's two sides measuring 248 meters each, and it includes 88 hangers and over ten thousand bolts [2]. Group 2: Inspection Process - The inspection is conducted during a limited "window" at night due to daytime train traffic, requiring the team to complete a thorough check within three hours [2]. - Workers utilize headlamps to navigate and inspect the bridge, focusing on potential issues such as paint cracks, loose bolts, and structural deformations, which are challenging to identify at high altitudes [3]. Group 3: Worker Experience and Safety - Workers face significant physical challenges during inspections, including high winds and the need for balance while navigating narrow spaces between structural components, referred to as "mushroom heads" [3]. - The emotional commitment of the workers is highlighted, as they recognize the importance of their work in ensuring the safety of future passengers traveling on the high-speed trains [4].