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On December 1, after 838 days of construction, the Taibao Tunnel of the TJ-4 bid project of the Liaoning section of the Shenbai High-speed Railway, which was undertaken by China Railway 16th Bureau Group, was safely and smoothly completed 82 days ahead of the guiding construction group, marking another important node breakthrough in the project construction and creating good conditions for the smooth construction of the subsequent ballastless track.
Taibao tunnel breakthrough site.
Taibao Tunnel is located in Daluo Village, Xinbin County, Fushun City, with a total length of 402798 meters, is one of the ten tunnel control projects on the whole line, using two working faces at the entrance and exit at the same time for construction. The tunnel is located in a low hilly area, with dense vegetation, large terrain fluctuations, complex geological conditions, and a 38-meter-long overburden in the shallow buried section of the cave entrance is only 24 meters thick, prone to collapse and roofing;There are 6 fault fracture zones and unconformity contact zones in the cave body, and there is a risk of water inrush in the rainy season. In addition, the tunnel entrance and exit working face is close to the village, and the blasting operation, slag transportation, concrete mixing and other processes have limited operation time, short effective operation time, and difficult construction.
Taibao tunnel construction site.
In the face of many safety and quality risks in the construction, the project team planned ahead of time, formulated and implemented a scientific and refined construction plan, and maximized the construction efficiency under the premise of ensuring safety and quality by optimizing the length of lining construction, adjusting the excavation and blasting process time, increasing construction personnel, optimizing excavation methods, and increasing slag removal machinery.
During the construction process, the project department always adheres to solving problems with technology, and closely integrates safety precautions such as advanced geological forecasting and monitoring and measurement with the construction organization. Adopt data collection, analysis and early warning system to achieve digitalization, informatization and refined managementUsing the Internet and big data platform, a "smart site" management system has been built to ensure the safety and quality of tunnel construction.
Aerial photography of the project construction site.
The Shenyang-Baihai high-speed railway starts from Shenyang North Railway Station, passes through 7 cities such as Shenyang, Fushun, Tonghua, Baishan and Yanbian, and ends at Changbaishan Station, with a total length of 430 kilometers and a design speed of 350 kilometers per hour. After the completion and opening of traffic, the minimum running time from Beijing to Changbai Mountain will be reduced to 4In about 5 hours, it will greatly promote the in-depth development of tourism resources along the route, which is of great significance to promote the economic development of Liaoning, the comprehensive revitalization and all-round revitalization of Northeast China, and the realization of high-quality development of the regional economy. (Li Wei, Shang Jiashun).