Tianjin Metro Line 7 From Xinghua Road station to Zhangdaokou Station, right line open

At 21:21 on May 31, the right line of Tianjin Metro Line 7 from Xinghua Road Station to Zhangdaokou Station (hereinafter referred to as Xingzhang Interval), led by China Construction Foundation and constructed by The Second Engineering Bureau of China Construction Engineering Co., LTD., was successfully opened with the cutter head of "Yue Yue" shield machine slowly breaking through the earth. This is the 5th single-line tunnel of the 3rd Bid Project Department and the 6th single-line tunnel of Tianjin Metro Line 7.

The right line of xingzhang section has a total length of 762m and a contact channel is set, which was successfully launched on March 18, 2022. The tunnel has an inner diameter of 5.9m, an outer diameter of 6.6m and a minimum turning radius of 400m on the plane. The tunneling of shield machine starts from the 400m small radius curve at the small mileage end of Zhangdaokou station, and drives towards the small mileage direction of the interval, and receives at the large mileage end of Xinghua Road Station. Several pipelines, such as DN273 high-pressure gas pipe and DN1500 rain water pipe, are successively drilled in the interval.

In order to ensure the safety of construction, the project department management team planned ahead, summarized the construction experience of the first four tunnels, solved a series of problems such as inconvenient site, poor geological conditions, difficult construction and high risk level, and successfully passed the 400m small radius turning excavation section at the beginning. At the same time, the project department cooperated with all parties involved in the construction, coordinated construction resources, coordinated various on-site work, arranged project team on duty every day, and safely and stably completed the right line excavation task under the premise of normalizing epidemic prevention and control.

Under the severe situation of the epidemic, the project department on the one hand ensured the safety of epidemic prevention, carried out epidemic prevention publicity and investigation, and firmly built a solid defense line for epidemic prevention. On the other hand, the maintenance period is advancing steadily, and the third bid, the fifth tunnel, is completed smoothly. In the future, all the management staff of the project department will continue to devote themselves to the site construction work as always, continue to carry forward the excellent quality of overcoming difficulties and striving to complete the comprehensive penetration of the four sections on schedule, and deliver a satisfactory answer to tianjin citizens.