| Construction details | High-density slurry type pipe jacking method with compatible type for underground obstruction |
|---|---|
| Method | Milling mole method |
| Completion date | Aug. 2013 |
| Location of Construction | Osaka city, Osaka |
| Ordering party | Osaka city |
| Pipe diameter | φ800㎜ |
| Distance | L=127.6m |
| Type of soil | Sand, Silt |
| Gravel size |
| Nominal diameter | φ800mm |
|---|---|
| Distance of pipe jacking | 127.61m |
| Type of soil | Sand, Silt |
| N value | ７ |
| Percentage of gravel | 0％ |
| Maximum gravel size | 0.0ｍｍ |
| Groundwater level | GL-３.05ｍ |
| Overburden | 8.37ｍ～6.25ｍ |
| Underground obstacles | 3 pine stakes |
| Construction period | Daytime work (8h) Jul. 2013～Aug. 2013 |
Since the obstacle is a pine pile, we conducted forward exploration using electromagnetic waves and excavation management using a data logger.
Since the obstacle is a wooden stake, the cutter torque and thrust did not increase, and the presence or absence of obstacle cutting was confirmed by discharging wood pieces.
Cut and discharged piece of wood
Discharged wire piece (φ16) and gravel
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