Guangzhou Metro Line 11 Tianhua section tunnel through two lines

After 353 days, the left line tunnel of The shield tunneling section between Tianhe Park and Huajing Road of Guangzhou Metro Line 11 was successfully completed recently, marking the completion of all the double-line tunnels between the area.

The tunnel on the left line of the shield section between Tianhe Park and Huajing Road is about 1169 meters long. Under the geological environment of soft strata and shallow overburden of only 4 ~ 5 meters, the shield machine has to cross the already operated Subway Line 21, and the vertical distance of the existing line tunnel is only 3.8 meters, which puts forward extremely high requirements for civil construction.

In the face of tight construction period, heavy tasks and high risks, on the one hand, the construction management department of Guangzhou Metro Line 11 organized the parties involved in the construction to hold a technical meeting, and studied and took a number of measures to overcome the difficulties. On the other hand, the construction unit, China Railway Guangzhou Metro Branch 3 (China Railway No.3 Bureau), increases the input of materials, machinery, materials and personnel in advance, and according to the safe construction organization plan, explores and marks the risk sources along the line in advance to strengthen the safety control during the construction. At the same time, the subway builders earnestly summarizes the construction experience of shield interval has been completed, the encryption of shield tunneling process monitoring, control, strictly control the various parameters in the process of excavation, strengthen the integral improvement, synchronous grouting, the segment assembling, such as process management, and use of shield remote monitoring system to realize the informationization construction, for the safety of shield tunneling to provide comprehensive protection. During the crossing of Line 21 by shield tunneling machine, Guangzhou Metro arranged monitoring personnel to inspect the construction area for 24 hours and automatically monitored the horizontal and vertical displacement of the tunnel from Tianhe Park to Tangdong on Line 21. With the joint efforts of all parties involved, the shield tunneling machine is guaranteed to achieve "zero error" accurately.

Up to now, the civil engineering of Line 11 has completed 35%. Of the 32 stations, two have been completed and opened, one is in preliminary preparation, and the other 29 are under civil construction. Among the 32 sections, 1 has been completed and opened, 15 are under civil construction, and the remaining 16 are being prepared before construction. Chisha rolling stock section and access section line for civil construction. (The name of the station under construction above is only the tentative name of the project, and the standard station name shall be subject to the approval and publication of the municipal government.)