Result

Construction of the central junction ramp bridge (substructure) on the Tokyo outer ring road (Year 2014)

Construction details High-density slurry type pipe jacking method with compatible type for underground obstruction
Method Milling mole method
Completion date Feb. 2018
Location of Construction Mitaka city, Tokyo
Ordering party Nexco Central
Pipe diameter φ2000㎜
Distance L=75.65m
Type of soil Silt, Clay
Gravel size

Work summary

Nominal diameter φ2000㎜
Distance of pipe jacking L=75.650m
Type of soil Silt, Clay
N value 5~8
Percentage of gravel -
Maximum gravel size -
Groundwater level GL-2.5m
Overburden 4.05m
Underground obstacles H-beam(200mm) x 3 places
Construction period Nov. 2017~Feb. 2018

An irrigation canal crosses around 30m above the baseline, and there are seven H-piles (200mm) as the foundation pile of canal, and four H-beams were extracted in advance. However, since the remaining two H-piles are close to the structure of the canal, we decided to cut them by the milling mold method without extract them.

Cut metal pieces

Carried out metal pieces, concrete debris, wooden stakes

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