| Construction details | High-density slurry type pipe jacking method with compatible type for underground obstruction |
|---|---|
| Method | Milling mole method |
| Completion date | Feb. 2018 |
| Location of Construction | Mitaka city, Tokyo |
| Ordering party | Nexco Central |
| Pipe diameter | φ2000㎜ |
| Distance | L=75.65m |
| Type of soil | Silt, Clay |
| Gravel size |
| Nominal diameter | φ2000㎜ |
|---|---|
| Distance of pipe jacking | L=75.650m |
| Type of soil | Silt, Clay |
| N value | 5～8 |
| Percentage of gravel | - |
| Maximum gravel size | - |
| Groundwater level | GL-2.5m |
| Overburden | 4.05m |
| Underground obstacles | H-beam(200mm) x 3 places |
| Construction period | Nov. 2017～Feb. 2018 |
An irrigation canal crosses around 30m above the baseline, and there are seven H-piles (200mm) as the foundation pile of canal, and four H-beams were extracted in advance. However, since the remaining two H-piles are close to the structure of the canal, we decided to cut them by the milling mold method without extract them.
Cut metal pieces
Carried out metal pieces, concrete debris, wooden stakes
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