| Construction details | High-density slurry type pipe jacking method with compatible type for underground obstruction |
|---|---|
| Method | Milling mole method |
| Completion date | Mar. 2015 |
| Location of Construction | Yao city, Osaka |
| Ordering party | Yao city |
| Pipe diameter | φ1000㎜ |
| Distance | L=229.2m |
| Type of soil | Sandy soil and cohesive soil |
| Gravel size | φ57㎜ |
| Nominal diameter | φ1000mm |
|---|---|
| Distance of pipe jacking | L=229.25m (Curve with R45m, R70m, R100m x 2, R200m) |
| Type of soil | Sandy soil and cohesive soil |
| N value | 4～35 |
| Percentage of gravel | - |
| Maximum gravel size | 57mm |
| Groundwater level | GL-3.39m |
| Overburden | 6.44m |
| Underground obstacles | H-beam 300mm x 2 places (One of two is unexpected) |
| Construction period | Daytime work (6.0h) Jan. 2015～Mar. 2015 (3 months) |
It was expected that H-beams (300mm) would be present on the pipeline near 5.5 m from the driving shaft. After cutting the first H-beam diagonally, TBM hit the second H-beam near 4m & cut diagonally as well. As a result, two H-beam (300mm) were cut. We also confirmed the discharge of metal pieces.
Discharged metal pieces
Discharged metal pieces
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