16.03 meters! China's largest city road single tube double layer tunnel in Wuhan

On August 29, the tunnel of the South Extension project of Wuhan Heping Avenue was successfully excavated in Wuchang District of Wuhan as the huge cutter head of the "Mir" shield tunneling machine slowly turned, which is a step closer to realizing the long-held wish of wuchang ancient city to be "cut off" along the river.

Wuhan heping avenue south extension project total length of 3042 meters, to avoid of the influence of the ancient city of wuchang, effective use of underground space, of which 1390 meters in the form of tunnel, under in wuchang city, beijing-guangzhou railway, the snake mountain yellow crane tower scenic spot and so on, using single tube double, two-way six lanes highway tunnel design, tunnel segment diameter 15.4 meters, design the driving speed of 50 km, A mud-water balance shield tunneling machine with a diameter of 16.03 meters was used for construction. This is the first two-way six-lane single-hole double-deck highway tunnel in China and the largest single-pipe double-deck shield tunneling tunnel in China at present. It is a control project connecting wuhan along river channel.

The tunnel is located in the core area of the city, starting from the Deshengqiao "Wushengmen" site area of Zhongshan Road, tunneling to huanghelou South Road to receive, through the complex geological strata, is one of the domestic construction technology content and difficulty of the project. The tunnel goes through the ancient city from the beginning, and there are more than 500 old buildings and many former residences of celebrities on the line, so the settlement control requirements are particularly high. It is very difficult to control the construction parameters of the shield tunneling machine when the super-large shield tunneling is parallel to the recently built metro Line 5 tunnel.