Core Points - Recent infrastructure developments in Jiangxi, Guizhou, and Sichuan have significantly improved transportation and logistics in revolutionary old areas, enhancing local tourism and economic growth [1][2][3][4][11] - The construction of key projects like Ruijin Airport, Huajiang Grand Canyon Bridge, and Jiajin Mountain Tunnel marks a historic breakthrough in the transportation network of these regions, facilitating easier access to historical sites related to the Long March [2][3][4][11] - The projects are part of a broader initiative by the central government to revitalize revolutionary old areas, ensuring that local communities benefit from improved infrastructure and economic opportunities [1][8][11] Infrastructure Developments - Ruijin Airport officially opened on September 28, 2023, after a 90-year wait, providing a direct air link to the Long March starting point [2] - Huajiang Grand Canyon Bridge, known as the world's highest bridge, has become a popular tourist destination, drastically reducing travel time across the North Panjiang River from 2 hours to 2 minutes [3] - Jiajin Mountain Tunnel allows for year-round access, significantly improving travel conditions that previously involved treacherous mountain roads [4] Economic Impact - The construction of Ruijin Airport has led to improved living conditions for local residents, with some benefiting from new housing and investment opportunities [8] - The Huajiang Grand Canyon Bridge has stimulated local tourism, with businesses like hotels and adventure sports thriving due to increased visitor numbers [10][11] - The Jiajin Mountain Tunnel connects various scenic spots, promoting a "Long March + outdoor + research" tourism model that enhances local economic development [11] Technological and Engineering Achievements - The construction of these projects involved advanced engineering techniques and technologies, such as the use of Doppler laser radar for wind measurement and innovative construction methods for the Jiajin Mountain Tunnel [5][6] - The focus on detail and quality assurance in construction has led to significant improvements in project outcomes, exemplified by the high standards achieved in the runway construction at Ruijin Airport [5][6] Cultural and Historical Significance - These infrastructure projects not only improve transportation but also serve to commemorate the historical significance of the Long March, connecting modern development with revolutionary heritage [1][11] - Local communities are leveraging their historical significance to attract tourists, creating immersive experiences that highlight the revolutionary spirit [11]

Core Viewpoint - The completion of the Qiaojin Mountain Tunnel, the longest secondary highway tunnel in China, significantly reduces travel time across the mountain and addresses transportation challenges for 110,000 residents during winter snow closures [3][4]. Group 1: Project Overview - The Qiaojin Mountain Tunnel spans 10.07 kilometers, with the main tunnel measuring 9.35 kilometers and a parallel tunnel of 9.36 kilometers [6]. - The project was initiated on December 26, 2021, with a total investment exceeding 1.8 billion yuan [6]. - The tunnel is designed to accommodate a speed of 60 kilometers per hour, adhering to secondary highway technical standards [6]. Group 2: Environmental Considerations - The tunnel's construction was mindful of the ecological impact, particularly as it is located within a giant panda national park [4]. - To minimize ecological disruption, the design of the ventilation and smoke exhaust system was modified from conventional shafts to parallel tunnels [4]. Group 3: Construction Achievements - The project utilized a Tunnel Boring Machine (TBM) for the first time in the construction of a national highway, achieving remarkable progress rates: 50 meters per day, 736 meters per month, and 1,000 meters over 40 consecutive days [4]. - The TBM used for the Qiaojin Mountain Tunnel was repurposed from a previous project, significantly reducing costs [4]. Group 4: Historical Significance - The tunnel is located at an average altitude of 3,000 meters and serves as a critical route for emergency rescue operations during natural disasters, such as the Wenchuan and Lushan earthquakes [4]. - The historical context of the area is highlighted by its association with the Long March, where key leaders of the Red Army traversed the mountain [3].