What is the name of the 28 km tunnel of Yakang Expressway?

The most difficult node project of Yakang Expressway-about 28.7 kilometers of tunnel group, brings together a number of extra-long tunnels with great construction difficulties, and Dagangshan Tunnel is among them. Yakang expressway Dagangshan Tunnel is a control project in the tunnel group from Luding to Kangding in Yakang expressway. The total length of the left line of the tunnel is 4730m, and the total length of the right line is 4723m. The tunnel entrance is on the cliff, with an altitude of 20 16m.

The tunnel adopts manual full-face excavation, which overcomes the difficulties of construction organization and access road transportation caused by rockburst and rapid change frequency of surrounding rock. The excavation is1202m, and it is successfully excavated to ZK117,057.

After the exit of the left line of Dagangshan Tunnel is connected, the ventilation in the tunnel is changed to the tunnel ventilation structure, which can reduce the use cost of ventilation pipes and reduce the air pollution in the tunnel. At the same time, after the inverted arch is laid, the imported air compressor of Dagangshan inclined shaft can be changed to the exit direction of the left line of Dagangshan tunnel, so as to ensure the imported civilized construction and create a good image. It has created conditions for the excavation of the shed hole position of the left line of Jinlong Middle Bridge and the construction scheme of the left line of Jinlong Tunnel from 2065438 to April 25, 2007.

On March 7, 2065438, it was learned from the construction party of the contract section C 17 of Yakang expressway of China Railway Tunnel Co., Ltd. that the exit direction of the left lane of expressway Dagangshan Tunnel of Yakang was successfully connected.