On August 22, the left-line shield of the Jiageng Gymnasium Station–Binhai West Avenue Station section of Work Area 1, Section 1 of the general construction contract for the Jimei–Tong'an section of Xiamen Rail Transit Line 6 was launched.

Since then, shield construction in the Jiageng Gymnasium Station–Binhai West Avenue Station section has entered the "dual-line parallel advancement" stage. The left line of the Jiageng Gymnasium Station–Binhai West Avenue Station section launched this time is approximately 1,130 meters long, with a minimum curve radius of 370 meters and a maximum gradient of 21‰ uphill, and is constructed using the earth pressure balance shield method. The section runs beneath Binhai West Avenue, and the coastal geological structure is complex and variable. During tunneling, construction difficulties and key issues such as segment damage, surface settlement, and significant changes in shield tunneling attitude are likely to occur.

To ensure the safe launch of the shield machine, the project team organized carefully and planned scientifically. On the basis of fully summarizing the construction experience of the right line, they safely and efficiently completed the hoisting, assembly, and commissioning of the left-line shield machine. Technical personnel conducted in-depth study of the geological survey report, formulated detailed response plans for potential problems, and carried out technical training and safety briefings by trade for the operating personnel.

In terms of construction organization, the project team formulated a detailed construction plan and summarized and analyzed the various tunneling parameters during the right-line launch construction, further optimizing the proposed tunneling parameters for the left-line launch to ensure construction quality and safety. Before the shield launch, radar geological scanning was organized along the ground above the shield section to accurately reflect the condition of stratigraphic cavities within a depth of 5 meters below the surface. At the same time, the sealing of supplementary exploration holes was inspected to ensure that the strata were dense and to guarantee shield tunneling. In response to the difficulties of muck conditioning and muck discharge volume control, the project department established a technical research team to continuously optimize the ratio of muck conditioning agents so that they achieve better conditioning results in residual sandy clayey soil strata and weathered rock strata. At the same time, communication and coordination with relevant departments were strengthened, creating favorable conditions for the smooth launch of the shield machine.