It was learned from the Municipal Metro Group that in the subway lines constructed at the same time this year, the construction of Metro Lines 5 and 6 was the first time in the history of subway construction in this city. The construction personnel used a number of techniques to successfully solve the loosening of the Tianjin area. New challenges in shield construction under the stratum.

　　Among the subway lines 5 and 6 under construction, Huanhu West Road Station and West Road Station are all three-story interchange stations. In the area around Huanxi West Road Station-West Road Station, Metro Line 6 is an upper and lower overlapping tunnel.  Metro Line 5 overlaps the upper and lower lines in this section. The lines are close to each other, the minimum distance is only 3 meters, there are many surrounding buildings, the settlement control requirements are high, and the overlap construction is difficult.

　　Among them, the intersection of Metro Line 5 is 1134 meters long, and the overlap of Metro Line 6 is 1080 meters long. This interval is the key point for controlling the total construction period of Lines 5 and 6. Similarly, after the subway line 5 line exits from Jingjiang Road Station, the line changes from horizontal to overlapping. The Dongfeng overpass enters Chenglin Road Station and Jintang Road Station, and then gradually enters the Dazhiyu West Road Station. These are the first overlapping tunnels in the history of Tianjin subway construction. During the construction process, the construction personnel should reasonably plan the shield, take the construction of the lower tunnel first, and construct the upper tunnel, accompanied by appropriate reinforcement measures to minimize the interaction between the upper and lower tunnels during the construction process.