10 meters hard to dig every day! Nanjing subway line 7 "baihe 51" starts

Recently, the shield machine of baihe 51 started smoothly in the dinwan section of subway line 7 (namely dingjiazhuang station and wanshoucun station). It is moving forward at an average speed of 10 meters per day, and it will take about 8 months to realize the connection of 1.8 kilometers between the two stations.

The geological conditions between dingjiazhuang station and wanshou village are uneven, some sections have underground karst caves, the subway construction area is close to the security housing community, and the pile foundation of bridge piles and high voltage towers should be put under... All these are challenges to shield construction. Simingyong said that the modification of the shield machine and the strengthening of quality control at every link will ensure the smooth progress of shield tunneling under complex geological conditions.

The subway construction in the urban area is narrow with numerous underground pipelines. The construction unit of line 7 has spent a lot of time on preliminary work such as afforestation relocation, pipeline relocation, road occupation and traffic dredging since it entered the site in October 2017. This year is the most concentrated year for their construction tasks. Yi Jinfang tells a reporter, line 7, divided into the south and the north, the northern section of the line 19 kilometers long, the contract amount is 6.28 billion yuan, which is divided into 11 work area, the current eight civil work area have been approach and project progress smoothly, has 8 stations in the main structure construction, this year is expected to complete the output value of 1.3 billion yuan, realize the top five station, 14 of shield machine starting.

It is reported that nanjing metro line 7 is all located on the south bank of the Yangtze river, running from northeast to southwest, passing through qixia, gulou, jianye and yuhuatai districts. The line connects xishan bridge, hexi, xiaguan, wutang village, xiaozhuang, dingjiazhuang and yaohuamen and other major districts, creating a fast passage between the old city and hexi new city. The total length of the line is 35.5 kilometers, all of which are underground. There are 27 stations along the line, including 13 transfer stations. Line 7, line 3 and the planned line 6 and line 1 will be extended to the north, which will greatly facilitate the travel of nanjing citizens.

Six subway lines are currently under construction in nanjing, and 12 will be under construction by the end of the year, according to the nanjing metro corporation.