National Highway 351 Kingshan Tunnel TBM began to excavate

Cover Journalist Gou Chun

On June 26, the National Highway 351 TBM TBM (full section tunnel excavation machine) equipment began to start and began to dig into the Aba Prefecture Xiaolin Duanping Cave. This is the first time that TBM construction is used in ordinary countries and provinces in China.

Construction Site. Photo Conferry Conferry at the Department of Transportation of Sichuan Provincial Department of Transportation

It is understood that on December 26, 2021, the National Highway 351 Jiakinshan Tunnel Project was officially started, with a total length of 10.07 kilometers (the main hole was 9.35 kilometers long and 0.72 kilometers long). The project adopts a drilling method+TBM construction.

Since the start of the project, the tunnel has been excavated by 683 meters (an increase of 292 meters compared to May), of which 151 meters of the main hole in Baoxing Duan, Ya'an City, 220 meters in Ping -Guide Cave, 152 meters in the main hole in the small gold end, and the flat -coded hole digging 160 in 160 Meter. At present, the main hole has been digged into the base rock and began to use the drilling method. After the construction of the TBM device, the speed of the tuning of the flat -guided hole was increased from 2 meters/day to 5 ~ 20 meters/day. After the project was completed, the Tongjin Mountain time was shortened from 1 hour to 10 minutes.

Construction Site. Photo Conferry at the Department of Transportation of Sichuan Province

A little more news:

TBM is a complete set of tunnel construction equipment integrating machinery, electricity, hydraulic, sensing, and information technology, which can achieve continuous excavation and can complete the operation of rock breaks and support at the same time. The speed of excavation is fast and high efficiency. The small gold end is used to use TBM, and the flat guide quickly runs through four horizontal channels to assist the main hole in the main hole.

TBM construction avoids blasting operations. The rock formation around the cave will not be damaged by blasting vibration. The wall of the cave wall is complete and smooth. TBM uses power energy supply, greatly saving fuel and reducing carbon emissions, which is conducive to the realization of carbon peaks and carbon neutrality.

The TBM construction improves the labor conditions of the operators, reduce the amount of physical labor, and avoid the critical casualties that may cause the personnel of the blasting construction.

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