en.Wedoany.com Reported - A 9-meter-diameter open-type TBM manufactured by China Railway Construction Heavy Industry Corporation Limited (CRCHI) achieved a monthly advance of 304 meters on May 22 in Lot 7 of the Chuncheon-Sokcho Railway Tunnel Project in South Korea, surpassing the "PROJECT 300" target set by the project owner. CRCHI believes this sets a new efficiency benchmark for mechanized tunnel excavation in the country.

During excavation, the machine also set records for a maximum daily advance of 24 meters and a weekly advance of 114 meters. According to reports, this monthly advance rate is nearly double the previous record for similar TBMs in South Korea, ranking among the highest monthly advance rates for TBM projects in the country.

Designed for hard rock excavation, the machine has a maximum excavation diameter of 9 meters, a total length of approximately 120 meters, a total weight of 1,651 tons, and an installed power of 5,100 kW. During construction, the TBM must navigate complex geological conditions including quartz porphyry, tuff, and granite, with rock compressive strength reaching up to 280 MPa. CRCHI states that the equipment has undergone multiple design optimizations for hard rock environments and has safely excavated 3,710 meters to date.

CRCHI attributes this performance to the machine's operational stability, excavation efficiency, and technical support from the on-site service team. The company states that the service team has worked closely with all project parties to ensure the machine maintains reliable performance, supporting the advancement of project goals.

The Chuncheon-Sokcho Railway is a key railway infrastructure project in South Korea, aimed at improving transportation connections between the capital region and the east coast.

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