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Okawa Bridge is a 209-m long cable-stayed bridge with
a 2-span continuous steel box girder. Opened in 2002,
the bridge carries "3-3-2 Okawa Line," a prefectural road
that connects Route 5 with the Shakotan Peninsula, over
the Yoichi River. Our company participated in the study
of wind resistance design of the bridge, and the manufacture
and erection of the bridge. In this report, we
describe our activities in the construction of Okawa Bridge.
The following are particularly notable.
1) Study of wind resistance design:
We conducted wind tunnel tests of a topographical
model and the main girder and the main tower, and
found that the vortex-induced oscillations of the main
tower would be problematic. We succeeded in reducting
the oscillations by changing the main tower's shape.
2) Erection:
Although the erection work faced many difficulties due
to the complex structure and the form of ordering, we
completed the erection work with precision through
scrupulous execution planning and administration.
3) Accuracy control:
We full used most of our accuracy control system in
controlling the shape of the bridge under construction
and controlling the cable tension to execute the work
with high precision. |
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