Chunfeng tunnel project has been tunneling 128 meters, shield machine is under construction on the riverside avenue. Chunfeng tunnel excavation diameter of 15.8 meters. The chunfeng tunnel starts from binhe avenue in the west to the east side of the overpass, docking with binhe avenue in the east to the south side of xinxing interchange and docking with henan road, with a total length of about 5.08 km, including a tunnel length of about 4.82 km. Two - way four - lane, using a single - hole double - layer form, shield tunnel length of 3,603 meters. Chunfeng tunnel is the first municipal highway tunnel constructed by shield method in shenzhen. The tunnel is constructed by mud-water balanced shield tunneling machine with the largest diameter in China. The total length of the shield tunneling machine is 135 meters, the excavation diameter is 15.8 meters and the total weight is more than 4,800 tons.

On December 17, the world's largest underwater shield tunnel was successfully completed, marking significant progress in the construction of inter-city railway in the pearl river delta and adding new impetus to the construction of the guangdong-hong kong-macao greater bay area.

On December 15, an event was held in Shanghai to launch the project from taicang to the fourth tuantuan section of the shanghai-nantong railway and promote the integrated development of the Yangtze river delta.

At present, dalian metro line 5 cross-sea big shield "haihong" has been smoothly tunneling 936 meters, is now average monthly speed of 90 meters. The total length of the tunnel is 2,870 meters. It has been 1/3 completed since the launch of the tunnel on January 18 this year.

At 10:58 on November 30, with the roar of firecrackers, the second TBM "fushan" of Qingdao metro line 4 civil engineering area of China railway construction bridge engineering bureau group co., ltd. was successfully launched, marking the beginning of the second journey of tunneling in lijiu section of Qingdao metro line 4.