| Construction details | High-density slurry type pipe jacking method with compatible type for underground obstruction |
|---|---|
| Method | Milling mole method |
| Completion date | Apr. 2017 |
| Location of Construction | Kashiwara city, Osaka |
| Ordering party | Osaka Water Supply Authority |
| Pipe diameter | φ800㎜ |
| Distance | 307.485m |
| Type of soil | Sandy soil, Gravel soil |
| Gravel size | 420mm |
| Nominal diameter | φ800㎜ |
|---|---|
| Distance of pipe jacking | 307.485m |
| Type of soil | Sandy soil, Gravel soil |
| N value | 16～37 |
| Percentage of gravel | 29.4％ |
| Maximum gravel size | 420㎜ |
| Groundwater level | GL-4.37m |
| Overburden | 8.51m |
| Underground obstacles | Floodwood(L=400mm) x 2 places |
| Construction period | Feb. 2017～Apr. 2017 |
In the original plan, it was a High-density slurry type pipe jacking method with Boulder compatible type,
but the design was changed due to the excavation of boulders,
(Φ430mm) and floodwood （1900ｍｍ）during shaft excavation.
Construction result: Floodwood（400ｍｍ）was cut in two places.
Floodwood discharged during excavation
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