民企定制装备突破施工极限 助力超级工程啃下“硬骨头”

Core Viewpoint - The news highlights the significant role of private enterprises in the construction of the Ningbo-Zhoushan Railway's underwater tunnel, emphasizing their contributions to innovation and technology in overcoming engineering challenges [1][5]. Group 1: Project Overview - The Ningbo-Zhoushan Railway's underwater tunnel is the world's longest and largest diameter underwater high-speed rail tunnel, set to end the historical lack of railway access in Zhoushan [1]. - Nearly 300 companies are involved in the construction, with over 90% being private enterprises, including national-level specialized "little giant" companies [1]. Group 2: Engineering Challenges - The project faces unprecedented challenges, particularly in the first 5,000 meters of soft soil, which is highly permeable and loose, making it difficult to avoid risks like water ingress and collapse [2]. - The construction goal is to achieve 5.4 kilometers of continuous tunneling without changing the cutting tools, a first in domestic soft soil underwater tunnel construction [2]. Group 3: Technological Innovations - Private enterprises have developed specialized equipment to meet the extreme conditions of the project, including a new transport vehicle capable of navigating a 9% incline, surpassing the traditional 8% limit [3]. - The cutting tools used in the shield machines have been enhanced through private sector innovation, achieving a welding strength of over 240 MPa, allowing them to withstand significant stress [2]. Group 4: Precision and Quality Control - Private companies are responsible for critical components such as the rubber sealing rings, which must endure a water pressure of 2.5 MPa, ensuring the tunnel's longevity and safety [4]. - An intelligent assembly robot developed by a private enterprise has improved the precision of box culvert assembly from centimeter-level to millimeter-level, enhancing construction accuracy [4]. Group 5: Collaborative Efforts - The project exemplifies the collaboration between state-owned and private enterprises, with private companies playing a crucial role in supporting national infrastructure projects through innovation and technology [5].