Core Insights - The Jinan Aerospace Avenue Yellow River Tunnel project has achieved a significant milestone with the "Qihang" shield machine completing over half of its tunneling work, reaching a depth of 1626 meters [2] - The tunnel, which spans 3888 meters and is designed for a dual six-lane urban arterial road with a speed limit of 60 km/h, is crucial for connecting the Yaoqiang International Airport and the new kinetic energy conversion pilot area [2] - The project faces complex geological challenges, including crossing the Yellow River and its embankments, necessitating advanced engineering solutions and real-time monitoring systems to ensure safety and efficiency [3] Project Details - The shield section of the tunnel, managed by China Railway 14th Bureau, extends 3252 meters and utilizes a 15-meter diameter slurry balance shield machine [2] - The construction team customized the "Qihang" shield machine to enhance tunneling efficiency by modifying the cutter head design and improving slurry treatment capabilities [2] - The project is expected to enhance the urban road network along the Yellow River, facilitating seamless connections between urban expressways and key transportation hubs, thereby supporting ecological protection and high-quality development in the region [3]

Core Points - The Jinan Aerospace Avenue Yellow River Tunnel project has officially entered the shield tunneling construction phase with the launch of the "Qihang" shield machine [1][3] - The tunnel, measuring 3,888 meters in length, is designed as a dual six-lane urban arterial road with a speed limit of 60 km/h, connecting the Yaoqiang International Airport and the new kinetic energy conversion pilot area [3][5] - The construction faces significant geological challenges, including complex soil conditions and a high water table, necessitating strict control over ground settlement during tunneling [3][5] Project Details - The shield section of the tunnel, managed by China Railway 14th Bureau, spans 3,252 meters and utilizes a 15-meter diameter earth pressure balance shield machine [3] - The geological conditions include a mix of silty clay, clay, fine sand, and silt, with a significant presence of calcium nodules, complicating the tunneling process [3][5] - The "Qihang" shield machine has a cutting area of 178 square meters, generating 800 cubic meters of waste slurry per ring, which poses challenges for waste management [5] Innovations and Solutions - The project team has customized the "Qihang" shield machine to address the challenging geological conditions, implementing technical innovations to enhance tunneling efficiency [5] - Measures include increasing the opening rate of the cutter head, reducing fixed scrapers, and adding pre-cutting and concrete cutting tools to improve waste discharge [5] - Waste slurry treatment capabilities have been enhanced through the installation of advanced equipment, including two-stage screening and plate filter presses [5] Impact and Significance - Upon completion, the tunnel will significantly reduce travel time between Jinan Airport and the core area of Cuizhai from 30 minutes to 10 minutes, facilitating better connectivity for vehicles and logistics across the Yellow River [5] - The project is a key initiative in response to the national strategy for the new kinetic energy conversion comprehensive pilot zone, enhancing the urban road network and improving connections to major highways and transport hubs [5]