| Construction details | Slurry type pipe jacking method |
|---|---|
| Method | Slurry type Mud max method |
| Completion date | May. 2007 |
| Location of Construction | Ojin-cho, Tokushima city, Tokushima Prefecture～Kitajima-cho, Itano-gun |
| Ordering party | Shikoku Agricultural Administration Bureau |
| Pipe diameter | φ2400㎜ |
| Distance | L=367.0m |
| Type of soil | Cobblestone mixed gravel |
| Gravel size |
| Nominal diameter | |
|---|---|
| Distance of pipe jacking | |
| Type of soil | |
| N value | |
| Percentage of gravel | |
| Maximum gravel size | |
| Groundwater level | |
| Overburden | |
| Underground obstacles | |
| Construction period |
Overburden 15m & within 367m of pipe jacking length, about 200m is the construction of the Yoshino River tributary (Imakiri River) river crossing. There was a high possibility that boulders & driftwood will appear, & the construction was carried out using a Slurry type & Mud pressure balanced type compound TBM that also supports boulders. The groundwater pressure was high, & it took time for initial driving & recovery of the TBM due to flooding at the time of launching & reaching.
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