The left tunnel between guangzhou south railway station and chencun north railway station in the west extension of guangzhou metro line 7 was successfully completed

Recently, "hongrun 22" shield tunneling machine broke through the shield well at chencun north railway station, marking the smooth completion of the left line tunnel between guangzhou south railway station and chencun north railway station in the west extension of guangzhou metro line 7. On December 19, 2019, "hongrun 23" had successfully completed the construction of the right-line tunnel. Since then, the tunnel between guangzhou south railway station and chencun north railway station in the west extension of line 7 has been connected by two lines.

To escape the underground complex conditions, after two of shield machine from guangzhou south railway station to the west is "S" type driving route, with 800 m radius turn right side wear landscape bridge, and underwater distance line seven phase out of the line a 1.95 meters of tunnel under wear, then side wear new station observation deck pile foundation, etc., with 800 meters radius turn left heading west WeiChong station after station directly through WeiChong. When the shield tunneling machine set off from the weizhong station again, it went through the municipal road, the large-area nursery site, the chencun waterway and the extra-large bridge pile foundation, and finally arrived at the chencun north station.

Due to shield tunneling area about 96% are argillaceous siltstone, and wear or side wear under several important architectural structures, river flood, etc., of shield machine arrived at chencun north station out of the hole to receive also face without the station floor keep 2.4 meters thick soil, side wall structure, David sealing device, unprovoked first formal reinforcement "have-nots" of the difficulties, in order to ensure the construction safety, builders, after several rounds of technical research, through the adoption of pneumatic auxiliary method, control of shield tunneling parameters, strengthening the secondary grouting, encryption methods such as the ground monitoring, go all out to ensure construction safety.

Up to now, the west extension of line 7 has completed 55% of the civil works. Among the 8 stations, 4 main structures have been capped, and the remaining 4 have been constructed by civil engineering. Of the 8 sections, 3 have been connected, and the remaining 5 have been carried out civil works. Yifeng parking lot and access line for civil construction.