Shenzhen rail transit line 14 left line shield tunnel in au section and baobao section started successfully on the same day

On March 31, shenzhen rail transit line 14, ao da interval (ao bei station - dayun station) left line shield tunnel, baobao interval (baohe station - baolong station) left line shield tunnel successfully started on the same day.

Metro line 14 is the first line in the middle part of shenzhen's urban express network, which starts at gangxia north and ends at shatin station, with a total length of about 50.34 km. It connects futian district, luohu district, longgang district, pingshan district, and reserved extension to huizhou conditions, a total of 17 stations, 1 parking lot, 1 depot, the main substation 4.

The line is automated and unmanned, with a maximum design speed of 120km/h. Among them, the total length of pingshan district 14.5 kilometers, set up 6 stations, 1 depot.

Construction difficulties of line 14

1、The shield tunneling interval is long, the environment and geology along the route are complex, and the construction risk is high;

2、High safety protection requirements for iron-related projects;

3、The karst geological development is widely distributed, and the karst development area has a great influence on the safety, stability and construction period of the pit pit and shield tunnel;

4、There are many extra-wide and extra-long stations, the surrounding environment is complex, and the construction technology is difficult;

5、It is difficult to transport and discard earth during the construction peak period.

Up to now, the overall station envelope structure accumulatively completed 96%, the station earthwork excavation accumulatively completed 66%, the station main structure completed 37%. Among them, the earthwork excavation of fuxin parking lot has completed 82%, the main structure 40%, the earthwork of nange depot 100%, the pile foundation 94%, the bearing cap 41%, the column 26% and the structural plate 12%.

Among them, 31 shield machines came into the well, and 28 started.

The construction side of line 14 made every effort to overcome the influence of the epidemic to realize the recent centralized launching of shield tunneling, which marked that the line had entered the "hot period" of shield tunneling.