Construction details | High-density slurry type pipe jacking method with compatible type for underground obstruction |
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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㎜ |
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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.
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