On October 3, the right-line shield tunnel from Luomashi Station to the Huoluo intermediate ventilation shaft on the Phase III project of Chengdu Rail Transit Line 18 was successfully holed through. This marks another new milestone in the construction of Line 18 Phase III within 20 days, following the successful holing-through of the right line in the section from Luomashi Station to the Luosheng intermediate ventilation shaft and the left line in the section from Provincial Gymnasium Station to the Luosheng intermediate ventilation shaft. To date, cumulative shield tunneling on the entire line has reached 17.8 kilometers, with 9 single-track sections holed through, marking major progress in the overall construction.

It is reported that the Line 18 Phase III project, constructed by China Railway Construction Kunlun Group, is an important transportation link connecting Chengdu North Railway Station, Chengdu South Railway Station, and Tianfu International Airport. The line has a maximum burial depth of 57.1 meters, and all shield sections along the line are excavated using shield machines with an excavation diameter of 8.63 meters, making it a super-deep-buried metro line in Chengdu that runs longitudinally through the main urban area using large-diameter shields.

"Large-diameter shield tunneling faces enormous challenges due to the large excavation face, and after entering the main urban area, the great tunnel burial depth and frequent crossings with existing lines." According to the person in charge of the project, to overcome difficulties such as large burial depth and long distances in the shield sections during the construction of Line 18 Phase III, 20 sets of "super fast-charging" horizontal transport locomotives have been successively deployed along the entire line. These locomotives feature high traction, fast charging, a wide speed-regulation range, smooth operation, reliable braking, and strong passing capability. When fully charged, they can haul 400 tons of cargo over 20 kilometers, enhancing the safety and continuity of shield muck transport and providing a guarantee for the simultaneous, continuous, and rapid tunneling of multiple shields.

At present, shield tunneling along the entire Line 18 Phase III is advancing smoothly and rapidly, with cumulative tunneling mileage exceeding 80% of the total designed section length. Next, Chengdu Rail Transit Group will anchor to its annual targets and tasks, go all out to boost the economy, advance construction, and promote development, accelerate the construction of the fourth-phase planned lines of Chengdu Rail Transit and the city (suburban) railway, and speed up the deep integration of rail and urban development.