| 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 | φ1650㎜ |
| Distance | L=325.4m |
| Type of soil | Sandy soil and cohesive soil |
| Gravel size | φ19㎜ |
| Nominal diameter | φ1650mm |
|---|---|
| Distance of pipe jacking | L=325.47m (Curve with R200m) |
| Type of soil | Sandy soil and cohesive soil |
| N value | 9~50 |
| Percentage of gravel | - |
| Maximum gravel size | 19mm |
| Groundwater level | GL-1.35m |
| Overburden | 10.58m |
| Underground obstacles | PC pile Φ250mm x 3 places |
| Construction period | Night work (8.0h) Nov. 2014～Mar. 2015 (5 months) |
It was expected that there would be support piles for the frontage road retaining wall (PC piles φ250 mm 3 places) on the pipeline. Traffic regulation was difficult because the road in the construction section was a arterial road with heavy traffic. Therefore, the milling molding method was adopted & three PC piles (φ250 mm) were cut.
Discharged metal pieces
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