During the 2024 World Tunneling Congress, as the most comprehensive risk and most difficult construction of similar projects in the world, the Guangzhou-Dongguan-Shenzhen Intercity Shield Project welcomed the research and observation of experts, scholars, entrepreneurs and government delegations from all over the world. The expert group listened to the on-site introduction of the project design, the major difficulties of the project, the configuration of the shield machine and the application of scientific and technological innovation by the Shenzhen Railway Group and the 22nd Bureau of China Railway, and observed the shield tunneling on the spot. “Fantastic!”“ Unbelievable!” In the face of this "super project", Chinese and foreign guests have "taken pictures and punched in", expressed their sincere admiration for the advanced equipment manufacturing and construction technology of China's tunnels, and spoke highly of the scientific and technological innovations such as the intelligent excavation system of the "Qiangguo" ultra-large diameter shield machine and the atmospheric pressure tool change technology adopted in the project.
Located in the central urban area of Shenzhen, Shenzhen Railway Group and the construction unit China Railway 22nd Bureau challenge the international problem of narrow underground space in the built-up area of the megacity with technological innovation, and creatively propose to replace two small shields with a diameter of 8.8 meters with a diameter of 13.27 meters, so that it is possible for the built-up area of the megacity to reach the intercity railway, and minimize the impact of tunnel crossing on the surrounding buildings and the occupation of underground space.
After the large-diameter shield is adopted, the geometric progression of construction risk and construction difficulty increases, and the long-distance passage of large-section tunnel through shallow buried water-rich strata and upper soft and lower hard composite strata, the requirements of shield equipment configuration increase, the frequent replacement of shield cutters, and the increase of large cross-section to the stratum and environmental disturbance, etc., bring great challenges to the implementation of the project. As an international shield power, the builder tailored the "Qiangguo" ultra-large diameter shield machine for the project, which interprets the highest contemporary international level of shield equipment.
It is understood that the diameter of the "Qiangguo" shield machine reaches an astonishing 13.27 meters, the total weight is more than 3,300 tons, equipped with more than 200 wear-resistant tools, and has super rock breaking ability. At the same time, it adopts the most advanced electrical system, advanced grouting system in the tunnel, excavation management system, automatic muck measurement system, and atmospheric pressure tool change system, so that the "Qiangguo" has a super "wisdom brain" and "nerve center", and makes it possible to safely construct a 13-meter-level super-large diameter tunnel in the core area of the megacity.
It is reported that after the completion of the Guangzhou-Dongguan-Shenzhen intercity Qianhai to Huanggang port section, it will exhaust the "rail" network of 9 cities in the Pearl River Delta Economic Zone, that is, with Guangzhou and Shenzhen as the center, 9 cities can be accessible to each other within 1 hour, forming a real sense of "one-hour living circle", which greatly facilitates people's travel.
The relevant person in charge of Shenzhen Railway Group said that the eyes of the international tunnel are focused on Shenzhen, China, and the Guangzhou-Dongguan-Shenzhen intercity project as a window connecting the international tunnel project shows the unique charm and strong comprehensive strength of Shenzhen and China's infrastructure. In the future, Shenzhen Railway Group will vigorously develop "new quality productivity" through continuous technological innovation, and work with rail builders to continuously polish the golden business card of "super project intelligent manufacturing in China", so as to show the intelligent manufacturing power of China's rail transit industry to the world.
(Author: Shenzhen Special Zone Daily Chief Reporter Dai Xiaorong Correspondent Xu Chang Intern Gan Zhaohua)