| Construction details | High-density slurry type pipe jacking method with compatible type for underground obstruction |
|---|---|
| Method | Milling mole method |
| Completion date | Nov. 2013 |
| Location of Construction | Sasebo city, Nagasaki Prefecture |
| Ordering party | Sasebo city |
| Pipe diameter | φ800㎜ |
| Distance | L=62.0m |
| Type of soil | Sandy silt mixed with gravel |
| Gravel size | φ52㎜ |
| Nominal diameter | Φ800mm (Φ900 steel pipe microtunneling method) |
|---|---|
| Distance of pipe jacking | L=62.0m |
| Type of soil | Sandy silt mixed with gravel |
| N value | 2 |
| Percentage of gravel | - |
| Maximum gravel size | 52mm |
| Groundwater level | GL-1.43m |
| Overburden | 7.17ｍ |
| Underground obstacles | Steel sheet pile (typeⅢ) 2 places |
| Construction period | Day and night work (16h) Nov. 2013～Nov 2013 (0.5 months) |
About 40 m after launching, the first obstacle (Steel sheet pile type III) was cut, & about 7 m was proceeded with normal pipe jacking.
After that, the second obstacle (Steel sheet pile type III) was cut & the remaining 15m was reached by normal pipe jacking.
This work was a water pipe laying work, in which a ductile pipe φ800 mm was inserted after penetrating a φ900 steel pipe.
Obstacles (Steel sheet pile type III) were used for revetment work during the construction of the Hizukushi bridge, & existed on both sides of the river.
2013.11.7 Status of discharged steel sheet pile cutting powder
2013.11.7 Status of discharged steel sheet pile cutting powder
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