Environmental Engineering Reference
In-Depth Information
Fig. 10.9
Construction of public utility conduit in Sendai (Miyagi Prefecture). Unlike Fig.
10.8
,
the construction site is located close to the center of town, so there is only limited work area requir-
ing heavy equipment to be efficiently located and uncluttered. Upper right half of the photograph
shows the 'Bon terrain' method location with loading and mixing underway
It should be noted that in 2007, the contract to extend the channel included a spe-
cial specification that the fiber-solidification method should be used for the treat-
ment of muds. This demonstrates that the benefits of the special characteristics of
this method are fully appreciated.
10.2.6.3
Imokawa River Landslide Dam Construction Emergency Measures
(Hokuriku Regional Development Bureau of MLIT, Yuzawa
Erosion Control)
In October 23, 2002 at 17.56, an earthquake of magnitude 6 on the Japanese scale
struck the Chuetsu region of Niigata Prefecture. Ojiya city (formerly the munici-
palities of Yamakoshi Nagaoka, Horinouchi and Kawaguchi) was affected by a big
landslide of rocks and soil, causing extensive damage and blockage of housing,
roads, railways, rivers, etc. This included large amounts of very soft soils. In order
to effect a speedy recovery, the access roads to the affected areas needed to be re-
stored as soon as possible, so the fiber-solidification method was used in the former
Yamakoshi Village area disaster recovery construction works. This improved the
