Result

Nishinari branch pipe (Nishinari) 800mm water pipe laying work

Construction details High-density slurry type pipe jacking method with compatible type for underground obstruction
Method Milling mole method
Completion date May. 2014
Location of Construction Nishinari-ku, Osaka city, Osaka
Ordering party Osaka City Waterworks Bureau
Pipe diameter φ1000㎜
Distance L=411.6m
Type of soil Sandy soil, Cohesive soil
Gravel size

Work summary

Nominal diameter φ1000mm
Distance of pipe jacking 411.65m
Type of soil Sandy soil, Cohesive soil
N value 10
Percentage of gravel -
Maximum gravel size -
Groundwater level GL-1.32m
Overburden 8.89m
Underground obstacles Steel sheet pile (typeⅢ) 1 place
Construction period Day and night work (8.0h) Feb. 2014~May 2014 (4.0 months)

About 161 m after launching, the first obstacle (Steel sheet pile type III) was cut. After that, normal pipe jacking was carried out for 7 m.
The second obstacle (Steel sheet pile type III) was cut & the remaining 244m was reached by normal pipe jacking.
In the section of about 9m across the national road, pipe jacking was carried out while chemical grouting in the TBM.
This work was a water pipe laying work, in which a φ800 mm water pipe was inserted after penetrating the φ1000 jacking pipe.
As a result of the construction, there was no metal reaction at the first obstacle (Steel sheet pile type III), & there was no actual discharge of metal pieces.
We proceeded with the pipe jacking while chemical grouting in the TBM, confirmed the metal reaction of the second obstacle (Steel sheet pile type III), started cutting the obstacle, & checked the discharge of steel pieces.

Check cutting powder (steel piece) with a magnet

Check cutting powder (steel piece) with a magnet

Status of chemical grouting in TBM

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