Hamakawa rainwater drainage pipe construction work(Phase2)

Construction details High-density slurry type pipe jacking method with compatible type for underground obstruction
Method Milling mole method
Completion date Dec. 2017
Location of Construction Shinagawa-ku, Tokyo
Ordering party Shinagawa City Disaster Prevention Town Development Department River Sewerage Division
Pipe diameter φ1650㎜
Distance L=68.6m (Curve with R30m, R75m)
Type of soil Silty sand
Gravel size

Work summary

Nominal diameter φ1650㎜
Distance of pipe jacking L=68.600m
Type of soil Silty sand
N value Average 31
Percentage of gravel -
Maximum gravel size -
Groundwater level GL-2.85m
Overburden Average 5.9m
Underground obstacles H-beam(300mm), existing manhole wall
Construction period Sep. 2017~Dec. 2017

H-beam and existing manhole wall were cut.
・H-beam(300mm), cutting length 390mm
・Existing manhole wall, cutting length 675mm
There was no problem in cutting H-pile, and it was possible to cut at about 0.1 mm / min.
The existing manhole wall was cut in the curve section of R75m.

Discharged metal pieces