Core Points - The newly constructed highways in Liangshan Prefecture have significantly improved transportation, adding 161 kilometers of expressways and bringing the total expressway mileage in the region to 633 kilometers, ranking it fifth in Sichuan Province [3][4]. Group 1: New Highways and Connectivity - The Lexion Expressway (乐西高速) from Mabei to Zhaojue has been fully opened, reducing travel time from Chengdu to Zhaojue from 9 hours to 4 hours, and from Mabei to Meigu from 3 hours to 1 hour [4]. - The Lexion Expressway features a dual four-lane design with a speed limit of 80 km/h and includes 9 interchanges and 3 service areas, enhancing the transportation network [4]. - The Yipan Expressway (宜攀高速) has also seen multiple key sections open, allowing for direct travel from Ningnan to Panzhihua in 2 hours, down from 5 hours [5][6]. Group 2: Future Developments - The Xizhao Expressway (西昭高速) has completed a significant section, with plans for full completion by 2026, contributing to the goal of achieving "county-level expressway connectivity" by 2030 [6]. - Liangshan Prefecture is currently experiencing a peak in expressway construction, with 9 projects underway, aiming to exceed 1600 kilometers of expressway by 2030, securing the second position in the province [6].

Group 1 - The G4216 Yibin to Panzhihua Expressway (referred to as "Yipan Expressway") has completed the construction of several key sections, significantly reducing travel time from 5 hours to 2 hours for the Ningnan to Panzhihua segment [1][3] - The expressway features a dual four-lane design with a speed limit of 80 km/h, connecting various regions seamlessly and enhancing the local transportation network [3][6] - The total length of the Ningnan to Panzhihua segment is 166.167 kilometers, while the Jinyang to Ningnan segment measures 105 kilometers, facilitating better access to the surrounding counties and cities [3][10] Group 2 - The Yipan Expressway is a crucial part of the national expressway network, with a total investment of 934.3 billion yuan, making it the largest single investment highway project in China [10] - The project faces significant construction challenges due to complex terrain and geological conditions, including crossing four world-class hydropower reservoir areas and multiple seismic fault zones [10] - The expressway aims to create a "1-hour economic circle" between Panzhihua and southern Liangshan counties, promoting economic integration and enhancing logistics for local industries [6][8]

Core Viewpoint - The successful completion of the Zhongdu River Grand Bridge marks a significant milestone for the Yibin to Panzhihua Expressway, laying a solid foundation for the entire highway to be completed and operational by 2027 [2] Group 1: Project Details - The Zhongdu River Grand Bridge is located in Xinshi Town, Ping Shan County, Yibin City, with a total length of 616 meters and a main span of 320 meters, crossing a steep V-shaped valley [2] - The construction faced complex conditions such as deep water, steep slopes, and fast currents, prompting the project team to innovate by applying advanced techniques like "trackless rear support hanging basket technology" [2] Group 2: Economic Impact - The Yibin to Panzhihua Expressway is the largest single investment highway project in the history of highway construction in China [2] - Once completed, the travel time from Yibin to Panzhihua will be reduced from 10 hours to 6 hours, significantly improving transportation efficiency [2]

Core Points - The Sichuan Yibin to Panzhihua Expressway's key project, the Xiejiawan Long Gas Tunnel, achieved dual-track completion on September 27, 2023, laying a solid foundation for the section's completion by 2026 [1][3] Group 1: Project Details - The Xiejiawan Tunnel is located in Yibin City, Sichuan Province, with a total length of 4,295 meters and a maximum depth of 712 meters, making it the longest tunnel in the Yibin section of the expressway [3] - The construction faced significant challenges due to the need to traverse poor geological conditions, including coal strata and karst development zones, as well as difficult material transportation [3] - The project team implemented a "no fire" process for gas control, utilized advanced geological prediction methods, and adhered to principles of short advance, weak blasting, strong support, and rapid closure during construction [3] Group 2: Project Specifications - The Yibin to Panzhihua Expressway has a total length of 446.36 kilometers, designed to a dual four-lane standard with a speed limit of 80 km/h [4] - The expressway will connect with the completed G4216 line and consists of three construction segments: from Ping Shan New City to Jinyang, Jinyang to Ningnan, and Ningnan to Panzhihua [4] - Once completed, the expressway will end the history of no expressway access for the counties of Leibo, Jinyang, and Butuo in Liangshan Prefecture [4]

Core Viewpoint - The successful completion of the 547-meter deep vertical shaft of the Baihetan Tunnel marks a significant breakthrough in the construction of the Yipan Expressway, overcoming complex geological challenges [1][3]. Group 1: Project Overview - The Baihetan Tunnel is a critical component of the Yipan Expressway, featuring a left line of 6,644 meters and a right line of 6,714 meters, with a maximum burial depth of 863 meters and a maximum daily water inflow of 61,800 cubic meters [3]. - The vertical shaft, with a diameter of 6 meters and a depth of 547 meters (equivalent to 180 stories), is designed for ventilation and smoke exhaust functions [3][4]. Group 2: Construction Challenges and Solutions - The project faced significant challenges due to poor surrounding rock stability, high water inflow, and risks of mud bursts and collapses throughout the construction process [3][4]. - A technical task force was established to address these challenges, employing a mechanized construction process called "SMD" for drilling, blasting, and material removal, which enhanced efficiency [3][4]. - The team utilized high-precision monitoring systems and advanced geological forecasting technologies to dynamically adjust construction plans, improving drilling efficiency by nearly doubling the progress rate [4]. Group 3: Project Progress and Future Outlook - Currently, over 90% of the roadbed, bridge, and tunnel works for the Yipan Expressway's Jinning section have been completed, with key projects advancing steadily [6]. - The expressway is expected to have 80 kilometers of road open to traffic by the end of 2025, significantly reducing travel time from Ningnan County to Panzhihua City from 5 hours to approximately 2 hours [6].