Recently, the Shishan No. 2 Tunnel right-line shield tunneling construction of the Guangfo West Ring Section 2 project undertaken by the Urban Rail Transit Company of China Railway First Group made new progress, successfully surpassing the 2,000-ring milestone and taking another solid step toward the breakthrough of this line.

▲Employees celebrate the successful breakthrough of 2,000 rings

The Guangfo West Ring Line of the Pearl River Delta intercity rail transit starts from Foshan West Station and ends at Guangzhou North Station. The Shishan No. 2 Tunnel, constructed by the Urban Rail Transit Company, has a total length of 5.4 kilometers and is currently the longest single-head single-line tunnel driven by the company. The section tunnel adopts the "shield method + cut-and-cover method" construction, including a 5,095-meter shield section and a 350-meter cut-and-cover section. It mainly passes through strongly and weakly weathered argillaceous siltstone and sandstone strata, and passes beneath and alongside high-pressure gas pipelines, expressways, high-voltage power towers, etc. The construction environment is complex and the safety risk is high.

▲Completed tunnel

To ensure the orderly progress of shield construction, the project team continuously optimized the construction organization, strengthened resource allocation, and strictly implemented the grid-based management system. For each key process, position, and area, staffing and shifts were arranged at fixed points to ensure responsibility is assigned to each individual. Tunneling safety risks were strictly controlled, and through various forms such as daily safety inspections, risk assessments, and morning meetings, the implementation of all safeguard measures was ensured.

In response to construction difficulties and important construction plans, the project team organized analysis and summary meetings at the first opportunity and invited industry experts to hold special plan seminars. Based on stratum changes and real-time surface monitoring data, the shield body tunneling posture was adjusted, and various tunneling parameters were dynamically optimized, ensuring the quality of segment assembly. At the same time, the management of the shield machine and backup equipment was strengthened to bring equipment performance to its optimal state, laying the foundation for safe, high-quality, and rapid tunneling in the tunnel section.

Next, the project will continue to carry out labor competition activities in depth, set off an upsurge of striving for excellence and excellence, accelerate construction production, and complete all annual targets and tasks with high quality.