| Construction details | High-density slurry type pipe jacking method with compatible type for underground obstruction |
|---|---|
| Method | Milling mole method |
| Completion date | Nov. 2016 |
| Location of Construction | Hiroshima city, Hiroshima Prefecture |
| Ordering party | Chugoku Electric Power Co., Inc. |
| Pipe diameter | Φ1000mm |
| Distance | L=214.51m |
| Type of soil | Clay-mixed sand, Sand layer, Hardpan, Rock reef |
| Gravel size | 57mm |
| Nominal diameter | Φ1000mm |
|---|---|
| Distance of pipe jacking | L=214.51m |
| Type of soil | Clay-mixed sand, Sand layer, Hardpan, Bedrock |
| N value | 3～4 |
| Percentage of gravel | - |
| Maximum gravel size | 57㎜ |
| Groundwater level | GL-1.95m |
| Overburden | 1.99～9.2m |
| Underground obstacles | Steel sheet piles left on both sides of the existing box culvert at a distance of about 2 m across the upper part of the pipeline, etc. |
| Construction period | Jun. 2016～Nov. 2016 |
Vertical alignment ： Curve with ±R100m×4 places, Inclination pitch ±10％，0‰
Horizontal alignment ： Curve with R100m x 1 place
The ground was divided into multiple layers, including clay-mixed sand and sand layer, Hardpan and bedrock.
Various metal pieces, including steel sheet piles, which were left on both sides of the existing box culvert at a distance of about 2 m across the upper part of the pipeline, were collected as underground obstacles.
Underground obstacles
Underground obstacles
Underground obstacles
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