|
| Stage | Construction activity | Date | Remark |
|
| S1: soil reinforcement and enclosure structure | TRD cement mixing wall | 2018.8.21–2018.9.3 | The soil reinforcement and construction of the enclosure structure have less disturbance to the existing line |
| Soil reinforcement of the triaxial mixing pile in the starting section of the shield | 2018.8.20–2018.9.3 |
| Construction of the diaphragm wall of the shield initial well | 2018.10.30–2018.12.30 |
| Groove wall reinforcement at the entrance and exit of D | 2018.12.25–2019.1.3 |
| Groove wall reinforcement at the entrance and exit of C | 2019.1.4–2019.1.6 |
| Construction of a diaphragm wall at the entrance and exit of C | 2019.4.14–2019.4.27 |
|
| S2: foundation pit excavation and structure construction of the shield initial well | Foundation pit excavation and support erection | 2019.5.25–2019.7.24 | There is a significant disturbance to the existing line |
| Main structure construction | 2019.7.25–2019.10.31 | The structure has been stabilized and the disturbance to the existing line is less |
| S3: the new tunnel crosses over the existing tunnel | New tunnel right line tunneling | 2020.7.14–2020.8.23 | The shield drove 100 rings, exceeding the influence range of the existing line |
| S4: the new tunnel crosses over the existing tunnel | New tunnel left line tunneling | 2021.1.6–2021.1.22 |
|
| S5: excavation and structural construction of the pit at the entrance and exit of C | Foundation pit excavation and support erection | 2021.3.3–2021.4.7 | There is a great disturbance to the existing line |
| Main structure construction | 2021.4.8–2021.5.30 | The structure has been stabilized and the disturbance to the existing line is less |
|
