Core Viewpoint - The world's largest diameter underwater shield tunnel has successfully completed the excavation of the Yellow River section, marking a significant milestone in the construction of this engineering project [1] Group 1: Project Details - The Jinan Huanggang Road Yellow River Tunnel completed the excavation task on June 22, with the assembly of the 1376th ring segment [1] - The project team adapted to the unique geological conditions of the Yellow River basin by increasing the opening rate of the shield machine's cutter head and installing a high-flow central flushing system to prevent mud cake formation [1] - The innovative "flocculation + concentration + pressure filtration" process was employed, allowing for the treatment of nearly 600 cubic meters of waste slurry per hour, improving waste slurry processing efficiency by 50% and reducing the moisture content of the filter cake to below 30% [1] Group 2: Progress and Achievements - The "Shanhe" shield machine has successfully completed the excavation of 1376 rings, totaling 2752 meters, with a construction progress of 83% [1]

Group 1 - Shanghai LEGO Park, built with over 85 million LEGO bricks, is set to welcome its first visitors in July, but the company faced initial concerns regarding complex cross-border tax issues related to equipment imports and frequent external payments [1] - The tax authority in Jinshan District provided a customized "full-process" cross-border tax solution, identifying 47 tax risk points and assisting the company in completing 15 external payment filings, resulting in a tax deduction of over 6.5 million yuan [1] - The company successfully applied for a tax refund of over 85 million yuan in input tax credits and received a reduction of nearly 250,000 yuan in urban land use tax [1] Group 2 - Prior to the official project handover, the tax department formed a volunteer service team to provide targeted support for the company's 219 employees regarding their income tax filing issues, offering policy consultation and system operation guidance [2] - The tax department's risk prevention efforts are not merely about identifying problems but also about helping companies establish systems to mitigate risks, as seen in the case of GeSi Aerospace, which benefited from tax deductions totaling 4.026 million yuan for R&D expenses [4] - The Shanghai Tunnel Engineering Company received nearly 190 million yuan in R&D expense deductions, crucial for the development of key equipment like the "Qiyue" shield machine, while the tax department assisted in managing cross-regional tax issues [5] Group 3 - The tax authority in Jiading District streamlined tax policies and provided risk management guidance for the construction of the 4.5 billion yuan medical equipment production and R&D base, helping the company avoid potential tax risks [6] - Shanghai's major engineering projects for the year include 186 formal projects and 35 preparatory projects, with a total investment plan of 240 billion yuan, highlighting the proactive approach of the tax department in fostering a law-based business environment [6] - The tax department aims to create a predictable and transparent tax environment for businesses in Shanghai, ensuring that policy benefits are fully and accurately released [6]

Core Viewpoint - The Shenzhen Spring Breeze Tunnel, a significant infrastructure project, has officially opened, featuring a unique "single-hole double-layer" design that enhances urban traffic efficiency and integrates land resources [1][2][3]. Group 1: Project Overview - The Spring Breeze Tunnel is a super-large diameter single-hole double-layer shield tunnel, with a diameter of 15.8 meters and a total length of 5,078 meters, including 4,600 meters of tunnel [2][3]. - The tunnel is designed for a maximum speed of 60 km/h and is restricted to small passenger vehicles with a height limit of 3.5 meters [1][2]. Group 2: Engineering Challenges - The project faced significant engineering challenges due to its location in a complex hydrological environment, with the tunnel traversing various geological formations, including soft and hard rock layers and multiple fault zones [3][4]. - The construction site is constrained, surrounded by numerous buildings and utilities, which adds to the complexity and risk of the project [3][4]. Group 3: Technological Innovations - The Spring Breeze Tunnel utilizes the domestically developed "Spring Breeze" shield machine, which is the largest of its kind in China, overcoming several technical challenges related to large-diameter shield construction [5]. - Advanced monitoring systems, including InSAR satellite remote sensing and BIM digital modeling, have been implemented to ensure real-time data support for construction safety and efficiency [6]. Group 4: Recognition and Future Impact - The project has been recognized as one of the "Top Ten Innovative Projects of Central Enterprises in 2018" and has received accolades for its technological advancements [5]. - The opening of the main line of the Spring Breeze Tunnel is expected to alleviate traffic congestion in the area and enhance regional connectivity once the entire tunnel is operational [6].

Core Insights - The article highlights the challenges and achievements of the construction of the Dali-Ruili Railway, particularly focusing on the difficult conditions faced by the construction team in Yunnan province [1][2][3] Group 1: Project Overview - The Dali-Ruili Railway includes the construction of the Gaoligong Mountain Tunnel, which is considered one of the most challenging railway tunnels to build due to the complex geological conditions in Yunnan [2][3] - The construction team, led by Zhou Kunpeng, has been involved in multiple tunnel projects in Yunnan, including the Funing Tunnel and the new Ping Tunnel, which collectively span 72.5 kilometers [5] Group 2: Construction Challenges - The geological structure in Yunnan presents significant risks, including high ground stress, high temperatures, water-rich conditions, and harmful gases, which complicate tunnel construction [2][3] - The Funing Tunnel faced issues with unstable foundations due to karst topography, requiring innovative solutions such as building a "bridge" within the tunnel to stabilize the base [3] Group 3: Personal Commitment and Impact - Zhou Kunpeng has dedicated over 12 years to railway construction in Yunnan, often at the expense of family time, reflecting the personal sacrifices made by construction workers in the industry [5] - The completion of the China-Laos Railway in December 2021 marked a significant milestone, improving transportation infrastructure in border areas and enhancing the quality of life for local residents [5]

Group 1 - The "Longgang No. 3" shield tunneling machine, developed by China Railway Equipment Group and China Railway Shanghai Engineering Group, is the largest diameter earth pressure/TBM dual-mode shield machine in China, marking the full entry into the large shield construction phase of the Deep-Shan Railway project [1][3] - The Deep-Shan Railway, a key transportation project in the Guangdong-Hong Kong-Macao Greater Bay Area, spans 125.5 kilometers with six stations and 18 double-line tunnels, enhancing connectivity between Shenzhen and the Deep-Shan Special Cooperation Zone [3][4] - "Longgang No. 3" features a diameter of 14.29 meters, a total length of 125 meters, and a weight of approximately 4,250 tons, equipped with advanced systems for geological forecasting and monitoring, enabling safe and efficient tunneling through complex geological conditions [3] Group 2 - The completion of the Deep-Shan Railway project is expected to significantly promote the integration of the Deep-Shan Special Cooperation Zone with Shenzhen, facilitating deeper involvement in the development of the Guangdong-Hong Kong-Macao Greater Bay Area [4] - The project will strengthen connections between the Guangdong-Hong Kong-Macao region and the coastal areas, optimize external railway channels from Shenzhen, and accelerate the construction of the Deep-Shan Special Cooperation Zone [4]

Core Insights - The article highlights the achievements of Chen Jian, a senior engineer at China Railway 14th Bureau, who has made significant contributions to the development of large-diameter shield tunneling technology in China [1][4][14] Group 1: Achievements and Innovations - Chen Jian has been instrumental in overcoming world-class challenges in shield tunneling, particularly during the construction of the Nanjing Yangtze River Tunnel, which faced issues such as high water pressure and complex geological conditions [5][7] - The team led by Chen developed innovative solutions, including a world-first technology for switching cutter heads under normal pressure, which has been successfully applied in international projects [7][8] - Chen's research and innovations have resulted in direct economic benefits of 2.016 billion yuan and additional revenue of 38 billion yuan for the company [7] Group 2: Team Development and Industry Impact - Under Chen's leadership, a specialized team of 1,900 members has been established, mastering ten core technologies and completing complex geological tasks across various projects [13] - The company has been involved in major infrastructure projects across China, including the "First Tunnel Under the Yellow River," addressing extreme geological conditions [8][14] - Chen emphasizes the importance of lifelong learning and technological innovation to drive industry development, aiming to tackle future challenges in shield tunneling [14]

Core Insights - The successful installation of the cutter head for the "Cangyuan" shield machine marks a significant milestone in the construction of the Haitai Yangtze River Tunnel, which is the world's longest underwater road tunnel [1][2] - The Haitai Yangtze River Tunnel is a key project in China's strategic plan for the Yangtze River Economic Belt and is expected to be completed by 2028, enhancing transportation capacity and supporting regional integration [2] Group 1 - The "Cangyuan" shield machine has a cutting diameter of 16.66 meters and a total length of 176 meters, weighing over 5,650 tons, setting a new record for domestically produced large-diameter shield machines [1] - The cutter head, which is the core component of the "Cangyuan" machine, consists of one central block and six edge blocks, equipped with 365 cutting tools designed for complex geological conditions [1] - The tunnel project spans 39.07 kilometers, with a shield tunnel length of 9,327 meters, a maximum water pressure of 0.75 MPa, and a maximum burial depth of approximately 75 meters [1] Group 2 - The combination of soft soil cutter head with gradient distribution alloy tools forms a "super hard dragon tooth matrix," significantly improving excavation efficiency in quartz sand layers with about 65% content [2] - The Haitai Yangtze River Tunnel is part of the "Yangtze River Main Line Cross-River Channel Layout Plan (2020-2035)" and is a priority project for Jiangsu's 14th Five-Year Plan [2] - Upon completion, the tunnel will effectively divert traffic from the Sutong Yangtze River Bridge, contributing to the integrated development of the Yangtze River Delta region [2]

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]

Group 1 - The "Linghao" shield machine, the world's largest diameter high-speed rail shield machine, has set a world record by achieving a monthly excavation of 718 meters [1] - The National Key Laboratory for Tunnel Boring Machines and Intelligent Operation and Maintenance, established by China Railway Tunnel Bureau, China Railway Engineering Equipment Group, and Zhengzhou University, is the only national public research platform in the field of tunnel boring machines [1] - The laboratory focuses on research in three main areas: efficient rock breaking and field change control, extreme working condition equipment design and manufacturing, and intelligent excavation and operation and maintenance [1] Group 2 - China is the world's largest country in terms of the number of tunnels, construction scale, and development speed [2] - The team has developed the industry's first shield TBM engineering big data platform, laying the foundation for the transformation of intelligent construction in shield TBM tunnels [2] - The intelligent construction system integrates nine major technologies, significantly enhancing engineering efficiency and quality, representing cutting-edge technology in China's high-speed rail tunnel construction [2] Group 3 - The research team consists of 47 members, with 33 under the age of 35, emphasizing the role of young talents in technological innovation [3] - The laboratory has established youth strike teams focused on intelligent excavation and geological disaster perception and prevention in TBM tunnels [3] - The team aims to contribute to high-quality development in tunnel intelligent construction through technological innovation, aligning with national goals for technological self-reliance [3]

Core Insights - The construction of major engineering projects continues during the "May Day" holiday, with significant progress being made in various regions [1] Group 1: Jiangsu - Haitai Yangtze River Tunnel - The Haitai Yangtze River Tunnel, spanning 11.185 kilometers, is the longest underwater road tunnel in the world, currently progressing with a shield tunneling machine named "Jianghai" [1][2] - As of now, the "Jianghai" shield machine has advanced 200 meters at a rate of 10 meters per day, utilizing advanced technology for efficient operation [1][2] - The tunnel features a unique rescue vehicle passage for emergency situations, designed to enhance safety and efficiency, with an expected completion date in 2028 [2] Group 2: Jiangxi - Changjiang Navigation Channel Improvement Project - The Changjiang Navigation Channel improvement project in Jiangxi is actively progressing, with over a hundred workers on-site during the holiday [3] - The project, which started in October 2024 and is expected to be completed by the end of 2028, aims to enhance the annual cargo throughput capacity to 15 million tons [3][4] - Innovative management and technology have led to significant cost savings of over 100 million yuan and a three-month reduction in the project timeline [4][5] Group 3: Safety and Technological Innovations - The Changjiang Navigation Channel project employs advanced monitoring systems, including 22 4K cameras, to ensure safety and effective risk management [4][5] - The integration of smart management and technological innovations is transforming construction practices, enhancing efficiency and safety [5]