| Construction details | High-density slurry type pipe jacking method with compatible type for underground obstruction |
|---|---|
| Method | Milling mole method |
| Completion date | Aug. 2015 |
| Location of Construction | Chiyoda-ku, Tokyo |
| Ordering party | Tokyo Metropolitan Bureau of Sewerage |
| Pipe diameter | φ1500㎜ |
| Distance | L=94.7m |
| Type of soil | Cohesive soil |
| Gravel size |
| Nominal diameter | φ1500mm |
|---|---|
| Distance of pipe jacking | L=94.7m |
| Type of soil | Cohesive soil |
| N value | 1～2 |
| Percentage of gravel | - |
| Maximum gravel size | - |
| Groundwater level | GL-7.76m |
| Overburden | 10.09m |
| Underground obstacles | Initial: 2 places of reinforced concrete, addition: 6 places of H-beam (H250～H350) |
| Construction period | Night work (8.0h) Apr. 2015～Aug. 2015 (3.5 months) |
There may be two reinforced concrete on the pipeline & the pipe jacking work was under a arterial road with heavy traffic.
As a result of the construction, TBM hit an unexpected obstacle after cutting two places of reinforced concrete. Unexpected H-beams (H250～H350) were continuously cut at 6 locations.
Discharged concrete pieces
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