Successfully penetrated through 21 risk sources, the "unicorn" shield excavation 2000 meters

A few days ago, the author learned from the China Railway Sixth Bureau that the large-diameter earth pressure balance shield machine "Yilin" (12.14 meters in diameter) independently designed and manufactured by the group and China Railway Equipment Group was designed and manufactured at the southwest ring shield of Taiyuan Railway Hub. The tunneling breakthrough of 2,000 meters marks the achievement of a new stage in the application of the large-diameter composite soil pressure balance shield machine used in railway tunnels and through long-distance complex construction methods.

Taiyuan railway hub southwest of the ring shield a total length of 4850 meters, located in Wanbaolin District, Taiyuan City and Jinyuan District, the tunnel diameter of 12.14 meters, is the current domestic large-diameter railway shield tunnel. There are numerous risk sources along the tunnel, which must pass through the residents of Huaqingyuan Community, Huajing Community and Huaying East District, and pass through the two rivers of Hutuo River and Jiuyuan Shahe, and pass through two elevated bridges, the South Inner Ring and the West Central Ring. , Underneath the two main municipal roads, Yingze West Street and Changfeng Street.

“At present, the excavation stratum is mainly a pebble stratum. The construction is very difficult, and the wear resistance of the tools is extremely high. To ensure that the shield machine successfully passes through this section, we hold an expert argumentation meeting and strengthen the improvement measures for the slag.” The staff of the project department introduced that as of now, the shield machine has accumulated 1000 rings and 2000 meters in total, and the total number of inspections of tools has been opened 3 times. The use situation is good.

The "Zhulin" shield machine was launched on December 21, 2016 and has been working for 11 months. The staff of the project department explained that during the period, they overcame the problems of the large-diameter shield tunneling machine with shallow slopes in winter, the difficulty in controlling the surface settlement of the shallow overburden excavation of large-diameter shields, etc The problem of large surface settlement rate and other issues have reversed the situation in which the construction of the shield is easily disturbed due to construction disturbance. The "Kirin" has successively passed through 21 West Mine Street, Guanyintang, Huaqingyuan Community, Tiexi Community, Huaying Community, Huaying Eastern District, Xiaojingyu Complex and Hutuo River, Jiuyuan Shahe and 21 rivers. Source of risk.

After digging 2000 meters, the Taiyuan Southwest Loop Shield Project Department achieved a staged victory in the forming of a tunnel without error, good ground surface monitoring data, and cumulative surface subsidence of less than 15 mm. The achievements of this stage will lay a good foundation for the successful penetration of the two inner elevated bridges in the South Inner Ring and West Central, and have accumulated valuable experience in domestic large-diameter earth pressure balanced shield tunneling technology.