study on economic partnership projects

Source: Study Team
Note: Upstream is on the left side).
Figure 3-21 Alternative Routes for the Second My Thuan Bridge
In Figure 3-21 above, a curved section needs to be introduced in the side span of the cable-stayed bridge
along Alternative 3 route. This curved section is needed to avoid the towers of 200 kV and 500 kV power
lines. This curved section cannot be avoided under Alternative 3; however, it is realized that the curved side
span causes unbalanced section forces which is generally not preferred in the planning of long span
cable-stayed bridges.
Therefore, said route was not selected, although it has the shortest span length of 500 m. It is also evaluated
that although the width of the river is 50 m longer, the main bridge section is straight under Alternative 2.
As a result, Alternative 2 is selected as the most feasible route among the alternatives (Table 3-15 provides
the comparison of the three alternatives).
Table 3-15 Comparison of Alternative Routes
Evaluation items Alternative 1 Alternative 2 Alternative 3
Road alignment Most smooth
Slightly shifted
A curved section with
alignment
eastward 50-100m small radius is
from Alternative 1 to introduced to avoid
avoid houses.
power line towers.
Side span of main
bridge includes a part
of curve section.
Affected houses Many houses near Less than Alt-1.
Less than Alt-1.
old ferry terminal
(309 houses)
(160 houses)
(170 houses)
Main River width is 550 River width is 550 m River width is 500 m
Bridge m and construction and construction cost and construction cost
cost is high. Depth is high. Depth at river is less. Depth at river
at river center is center is more than 30 center is more than 30
Cost
good
bad
poor
3-32
good
good
poor
bad
good
better