| Construction details | 地中障害物対応型泥濃式推進工法High-density slurry type pipe jacking method with compatible type for underground obstruction |
|---|---|
| Method | Milling mole method |
| Completion date | Feb. 2012 |
| Location of Construction | Minato-ku, Tokyo |
| Ordering party | Marunouchi Heat Supply Co., Ltd. |
| Pipe diameter | φ2000㎜ |
| Distance | L=78.3m |
| Type of soil | Sandy silt |
| Gravel size |
| Nominal diameter | φ2000mm |
|---|---|
| Distance of pipe jacking | L=78.3m (Curve with R200m x 1 place) |
| Type of soil | Sandy silt |
| N value | 2 |
| Percentage of gravel | - |
| Maximum gravel size | - |
| Groundwater level | GL-4.05ｍ |
| Overburden | 18.35ｍ～17.89ｍ |
| Underground obstacles | H-beam (300mm) x 4 places, 2 pieces per cross section x 4 places |
| Construction period | Day and night work (16h) Dec. 2011～Feb. 2012 (2 months) |
About 10 m after the launching, the first obstacle (H-beam, 300mm) was cut, and then the second and third H-beam (300mm) were cut at intervals of about 2 m. After that, we planned to cut the remaining 3 places of H-beams (300mm) until reception shaft.
However, TBM did not encounter the remaining three obstacles (H-beam, 300mm).
The first piece of metal discharged. It was cut in a fairly large state.
Discharged metal pieces. It was cut to about 1 cm.
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