Result

Airfield North Drainage(41st Construction Zone) Sewerage Works(Year 2016)

Construction details High-density slurry type pipe jacking method with compatible type for underground obstruction
Method Milling mole method
Completion date Oct. 2017
Location of Construction Yao city, Osaka
Ordering party Yao City Urban Development Department Sewerage Development Division
Pipe diameter φ800㎜
Distance L=155.710m
Type of soil Clay, Sand
Gravel size

Work summary

Nominal diameter φ800㎜
Distance of pipe jacking L=155.71m (Curve with R50m, R30m, R45m)
Type of soil Clay, Sand
N value 3~5
Percentage of gravel -
Maximum gravel size 10mm
Groundwater level GL-1.58m
Overburden 4.94m
Underground obstacles Unknown steel, steel sheet pile
Construction period Apr. 2017~Oct. 2017(Night work)

In the original plan, there were two cuttings of the steel sheet pile(Type III), but one was not encountered.
However, TBM encountered three unplanned obstacles, and although it could confirm the reaction of the steel product on the monitor, but we decided to conduct a horizontal exploration of the object separately.
The survey method was horizontal exploration using the reed pipe of the speeder method. As a result, it was not possible to determine what the object was, but the presence or absence of obstacles could be confirmed, so we decided to cut.
・Unknown steel  250mm
・Unknown steel  175mm
・Steel sheet pile 600mm
・Unknown steel  425mm

Discharged metal pieces

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