Research Article
Risk Mitigation and Construction Control for Effective Underwater Recovery of an EPB Shield: A Case Study of the First Metro Tunnel in Tel Aviv
Table 3
Underwater recovery schedule of shield.
| Step | Process | Duration (d) |
| 1 | Sealing ring installation | 4 | 2 | Concrete cradle casting | 2 | 3 | Steel plate and weld placement | 4 | 4 | Receiving bracket installation | 3 | 5 | Grouting pipe installation for sealing ring | 1 | 6 | Water injection into the shaft | 2 | 7 | Underground diaphragm wall excavation | 1 | 8 | Bottom concrete examination and clearing by divers | 2 | 9 | Cutterhead excavation to the shield tail into the diaphragm wall | 2 | 10 | Shield tail sealing | 1 | 11 | Secondary grouting | 2 | 12 | Shaft drainage | 2 | 13 | Shield advancement to the designated position | 1 |
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