Kunming metro line 4 is the first deep buried shield tunneling double line

On the afternoon of August 21, the reporter learned from kunming railway company that the left line of shield tunnel between the north railway station and bailong road station was successfully completed yesterday. This marks the successful reception of the shield of the first deep buried overlapping tunnel of line 4, and the successful completion of the 58th single line section of line 4 project.

It is understood that the train north station - the length of the left line of white dragon between road station about 1260 meters, in the process of excavation to overcome the long close side wear buildings, under article 3 the municipal road, long distance overlapped section of pile group of shield tunneling, geology is complicated and full face whole section is rich in water round gravel layer geological and embedded overlap tunnel shield receive technical problems. It took 218 days to realize the smooth connection between the north railway station and bailong road station.

The successful completion of this area not only laid a solid foundation for all the 60 single-line sections to be "through the tunnel", but also created a vivid example of shield tunneling and receiving of deep buried overlapping tunnel for kunming metro construction.