- PT Bangungraha Sejahtera Mulia
VIVAnews – The government has started preparing the Sunda Strait Bridge (JSS) that has been predicted to shift Japan’s bridge as the second longest bridge in the world. It is expected that the bridge can be an alternative solution to the high mobility between Sumatra and Java islands.
Some experts have proposed concepts of the bridge that will connect the two islands. One of the concepts was put forth by Prof. Dr. Ir. Iswandi Imran, structure engineer from Faculty of Civil and Environmental Engineering of Bandung Institute of Technology (ITB).
Iswandi’s design points out that Sunda Strait, stretching for 27.5 kilometers, requires a link of suspension bridge series, cable stayed bridge and centipede bridge.
“The model will accord to the depth of the sea,” said Iswandi during the ‘design and build’ seminar of Sunda Strait bridge construction plan study case at Democratic Party executive board’s office, Jakarta, Wednesday, June 22, 2011.
It is planned that the longest bridge in the JSS series be a suspension bridge comprising edge span of 2 x 800 meters, main span 2200 meters and bridge width 60 meters.
The bridge is designed to function as highway lane of 2x3 meters, emergency lane 2x1 meters and double-track railway.
The Sunda Strait bridge will also accommodate utility lines such as gas pipe, oil pipe, fiber optic cables, and electric cables.
Iswandi explained that the span of the Sunda Strait bridge is longer compared to bridges that have been built so far. Some of the bridge’s segments are submerged in the deep sea, so the foundation structure should be high.
“These are the factors that the planning and the construction are relatively complex and very challenging,” said Iswandi.
Bridge Construction
The Sunda Strait bridge will be a long and wide bridge, so it requires some segments of long span, high pylon structure and deep and massive foundation structure.
It is estimated that the bridge has environmental loads such as the wind, earthquake potentials and others. Furthermore, the bridge is located in an aggressive area, the sea (with high concentration of sulfate and chloride). Some segments are even in the deep sea.
“According to the Sunda Strait bridge’s design, the span is 150 years,” said Iswandi.
Consequences
Building the mega structure of Sunda Strait bridge requires huge volume of construction material and high-quality material technology. Therefore Iswandi viewed that the special construction materials must have high ratio of weight and be sustainable.
In addition, the bridge construction needs special design and structure system of third-generation deck and others.
The construction method must also take into account the factors such as the difficult field conditions because it involves under-sea casting.
Translated by Indah Lestari
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