Construction of shield tunneling began in the controlled section of the main urban area of Nantong Rail Transit Line 2

On August 22, the shield tunneling machine of "Zhiyun no. 10", the first phase of Nantong Rail Transit Line 2, was successfully launched at Zhongxiu Road Station, marking that the progress of the section shifted from the main structure construction stage to the interval tunnel construction stage, and the shield tunneling of the section controlled by the construction period of the main urban area began.

It is reported that Zhongxiu Road Station is located in the old city at the intersection of Hao Xi Road and Zhongxiu Road Station, with large vehicle flow, numerous surrounding buildings, adjacent to pipelines and municipal facilities. It is difficult to clear the traffic, heavy demolition task and complicated pipeline relocation. The left line of the section from Zhongxiu Road Station to Beicheng Bridge Station is about 1470 meters long, and the tunnel has a depth of 10.6 meters to 29.4 meters. It passes through the Lu Canal and the Exploration Kingdom with a small radius S-shaped curve, and has two communication channels. Among them, the overburden thickness of tonglu Canal section is 14.7 meters, and the exploration Kingdom section is only 1.7 meters away from the pile bottom, so the construction safety risk is relatively large.

According to the introduction, in order to ensure the smooth start of the "Zhiyun no. 10" shield machine, under the leadership of Nantong Railway Company, the construction unit won the bid to enter the site in the month of the month of construction, safe and fast to achieve the zhongxiulu station bridge demolition task. During the construction of the main enclosure structure of the station, the difficulties such as the special geology of the water-rich sand layer and the seepage of the underground diaphragm wall were overcome, and the closure of the underground diaphragm wall and the bottom and top sealing of the main structure of the north foundation pit of the station were successively completed, laying a foundation for the initiation of the shield.

So far, there are 28 stations in the first phase of Line 1, and 24 stations have completed the capping of the main structure. 44 single - line intervals through. The main envelopment structure of the 17 stations in the first phase of Line 2 is all closed. About 1.48 million square meters of foundation pit excavation have been excavated for the main structure of the whole station, and the main structure of the four stations has been capped. Ten shield machines were started and three single lines were connected.