| Construction details | High-density slurry type pipe jacking method with compatible type for underground obstruction |
|---|---|
| Method | Milling mole method |
| Completion date | Jul. 2015 |
| Location of Construction | Chuo-ku, Tokyo |
| Ordering party | Tokyo Metropolitan Waterworks Bureau |
| Pipe diameter | φ1200㎜ |
| Distance | L=170.5m |
| Type of soil | Silt mixed with sand |
| Gravel size |
| Nominal diameter | φ1200mm |
|---|---|
| Distance of pipe jacking | L=36.628m (Curve with R120m), L=133.936m (Curve with R120m, R150m) |
| Type of soil | Silt mixed with sand |
| N value | 1～4 |
| Percentage of gravel | - |
| Maximum gravel size | - |
| Groundwater level | GL-2.25m～-2.4m |
| Overburden | 7.06m～4.1m |
| Underground obstacles | Insurance method (Possibility of existence of wooden stake Φ300mm) |
| Construction period | Daytime work (8.0h) May. 2015～Jul. 2015 (2.5 months) |
Initially, there was a possibility that a wooden pile φ300mm was present on the pipeline.
As a result of the construction, we were able to finish the construction without hitting the wooden pile φ300.
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