| Construction details | High-density slurry type pipe jacking method with compatible type for underground obstruction |
|---|---|
| Method | Milling mole method |
| Completion date | Sep. 2013 |
| Location of Construction | Yao city, Osaka |
| Ordering party | Yao city |
| Pipe diameter | φ1800㎜ |
| Distance | L=119.9m |
| Type of soil | Sandy soil and cohesive soil |
| Gravel size | φ19㎜ |
| Nominal diameter | φ1800mm |
|---|---|
| Distance of pipe jacking | L=119.86m(Curve with R150m, R50m) |
| Type of soil | Sandy soil and cohesive soil |
| N value | 13 |
| Percentage of gravel | 4% |
| Maximum gravel size | 19mm |
| Groundwater level | GL-1.18m |
| Overburden | 11.35m～10.09m |
| Underground obstacles | Existing jack pipe(Φ1800mm) L=8.21m |
| Construction period | Night work (6h) Apr. 2013～Sep 2013 |
Explosion-proof TBM was used for pipe jacking work to demolish the existing pipe (φ1800 mm NS pipe) 8.46 m.
Initially, there were concerns about the steel collar of the jacking pipe, the entanglement of the cutter head such as the rebar, and damage to the pinch valve, but it passed without any problems. After arriving, we inspected the cutter head, pinch valve, etc., but there was no noticeable damage.
I think we have taken the first step in promoting the renovation in the future by removing the existing pipes and constructing new pipe by the pipe jacking method.
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