Construction of Wuhan Metro Line 2

Located in Fanhu to Hankou Railway Station.

Wuhan's first subway shield tunnel-Hankou Fanhu to Hankou Railway Station was completed at 2 am on June 30th, 2004. The shield machine is only a few meters away from the destination, and the construction workers have hung a banner "Celebrating the smooth completion of the Hanfan right line tunnel" at the exit of the shield machine in Hankou subway station.

Hanfan section is the shield section of Metro Line 2, the first section of the cross-river subway, with a total length of 1.0 1 km. It is designed with two holes and two lines, with a diameter of 6.28m, which is only about half of the diameter of the Yangtze River Tunnel (11.38m). The first subway shield machine "Pioneer 10" in Wuhan was excavated at a depth of about 103m underground103, and finally "saw the light of day" today.

According to the introduction of Wuhan Metro Group, due to the planned construction of the underpass of the Second Ring Road on Development Avenue, in order not to affect the construction of underpass in the future, the construction unit slowed down the excavation speed at the end and specially strengthened the foundation at the intersection of the subway tunnel and underpass. The receiving well of Hankou Railway Station Square has drilled dewatering wells 14. These dewatering wells with a depth of14.5m are used to reduce the groundwater level and ensure the safety of the shield machine. This is the first section tunnel of Wuhan Metro constructed by mining method, and it is also the first section tunnel on the southeast bank of the Yangtze River after the two-way tunnel from Hankou Railway Station to Fanhu Station.

Huming Tunnel of Wuhan Metro Line 2 is divided into left and right double lines, with a total length of 2503m, and is constructed by mining method. The geology of this section of tunnel is complex, and the tunnel roof is shallow overburden with water. The ultra-shallow tunnel with artificial miscellaneous soil is 680m long, and the thinnest part of clay layer is only 0.5m thick. Karst, karst ditch and karst groove are developed at the bottom of tunnel, which makes the construction extremely difficult.

On February 6, 2005 +09, the construction of the Tiger Name Section started. All parties involved in the construction attached great importance to the quality and safety of the project, carefully organized, closely coordinated and scientifically dispatched, and constantly optimized the construction scheme, which overcame many difficulties such as fault zone in high water level area, the hardest hit area of karst cave, silent blasting excavation invading bedrock, ultra-shallow buried section of artificial miscellaneous fill and so on, and effectively prevented safety risks such as water inrush, mud outburst, surface subsidence and pipe network destruction. The first connecting passage of Wuhan Metro Line 2 was successfully connected, which is the first successful freezing construction project in Wuhan.

The tunnel is located in the middle of the tunnel between Hankou Railway Station and Fanhu Station of Metro Line 2, connecting the left and right tunnels, with a length of about 6 meters, a clear height of 5 meters and a clear width of more than 3 meters. The passage is divided into two layers, and the lower layer can pump and drain the accumulated water in the tunnel; The upper floor is the escape route for passengers. There will be multiple communication channels on the whole line of Metro Line 2. The track laying of the left line tunnel from Golden Yayuan Station to Changqing Garden Station of Wuhan Metro Line 2 became the first bid section of the tunnel to complete the track laying of Line 2.

The single line length of this section of tunnel is 1.7 km. The rail car entered the tunnel from Golden Yayuan Station, and a cool breeze hit head-on. Wang Lin, project manager of China Railway 11th Bureau, said that the temperature in the subway tunnel is 10 degrees Celsius lower than the ground, and it is warm in winter and cool in summer.

There is a ditch on the track bed between the rails, which can collect the accumulated water in the tunnel to the storage well in the middle of the tunnel and then pump it to the municipal drainage pipe network outside the tunnel. Because there are construction workers working in the tunnel, the speed limit of the rail car is 5 km/h, and it takes about 20 minutes to walk one way. Wang Lin said: "When the subway passes, this tunnel will be finished in about two minutes."

The technical requirements of metro line 2 track are the same as those of high-speed rail track, but the requirements of metro track for vibration reduction and noise reduction are higher than those of high-speed rail track. The tunnel track between Golden Yayuan Station and Changqing Garden Station has been paved for more than 800 meters, which is expected to be paved by the end of this month. It is planned to lay12km, accounting for nearly half of the main line project of Line 2.

On February 6, 2000, the right line of the first subway tunnel crossing the Yangtze River in China was connected. After 22 months of hard work by China Railway Tunnel Group, the right line of Wuhan Metro Line 2, known as "the first tunnel of the Yangtze River", was successfully completed at 6 am on February 6, 2000, becoming the first subway tunnel across the Yangtze River in China. According to Wuhan Metro Group, it is expected that the cross-river subway will run through two lines in early March.

The tunnel of Line 2 is located between the Yangtze River Bridge and the Yangtze River Highway Tunnel, with a total length of about 3 100 meters and an excavation depth of 48 meters below the average water level of the Yangtze River. It is a double-track and double-hole tunnel.

The right line of Line 2 started from Jiyuqiao Station, crossed the finish line yesterday and stopped at 25 meters underground of Jianghan Road. We can't see the shield machine coming out of the hole It is hidden in a pool.

According to the introduction of the construction headquarters of Wuhan Metro Group, when the shield machine goes out of the hole, according to the conventional construction party, the last ten-meter-long road section should be "hardened", so that the shield machine will be "cut off" from the groundwater after tunneling to the hardened road section, and the hardened soil will not collapse, thus ensuring the shield machine to go out of the hole safely. However, at the exit of the right line of Line 2, there is a KTV business building above which has not been demolished, so it is impossible to complete the underground "hardening" and has to be changed to "underwater reception".

China Tunnel Group, the construction party, poured concrete with a height of10m into the shaft out of the shield machine, and then poured water with a depth of about10m on it, which is as deep as the surrounding groundwater, without water pressure difference. The shield machine finally emerged from the concrete.

It is reported that the left line crossing the river is expected to arrive in early March, and Jianghan Road shaft will maintain this water environment until the left line arrives, then drain water, dig out concrete and hoist the shield machine.

Metro Group said that this is the first time that the track shield machine in our city has adopted the "water outlet" method, which is more expensive than the conventional tunnel. The concrete and water poured on the river crossing line are close to 14250 cubic meters.

According to the introduction of China Tunnel Group, both the left and right lines of the river-crossing line have encountered difficulties. The right line "cuts" rocks and overcomes the hard and soft rock layers; The left line encountered two steel pipes of unknown origin and stopped in front of the cutter head, which made the shield machine unable to move forward. German technicians were hired to cut them out of the ballast in front of the shield machine. 2012110: 20 In the early morning of February 4th, at Jianghan Road Station of Wuhan Metro Line 2, workers changed the last sign of "Zhou Heiya Jianghan Road" to "Jianghan Road Station". At this point, all the signs of the subway station named by the advertisement of Line 2 have been replaced.

20 1 1 At the end of the year, nine enterprises including Zhou Heiya won the naming rights of Wuhan Metro Line 2. Some time ago, these station names were accused of being "over-commercialized", which triggered a heated discussion. 20 12 1 1 ends, and all site titles are cancelled. After six years of intense construction, the first phase of Wuhan Metro Line 2, the first subway crossing the Yangtze River in China, began to invite citizens to visit and experience the ride on 10/5, 2000. The first subway tunnel project across the Yangtze River in China has passed the evaluation, and all preparations have been fully prepared. It will be put into trial operation on October 28th, 2000/KLOC-0.

After three months of no-load trial operation, the first phase of Wuhan Metro Line 2, the first tunnel of Wanli Yangtze River Metro, has officially passed the expert review organized by the Ministry of Transport.