Rantau Berangin

Lately we are quite puzzled by the issue of Siak Bridge-1 to be collapsed, the floor plate Siak Bridge-2 had already started cracking at the age of about 20 years. We almost forgot there was an old bridge around us is still strong, let is falling ill just did not ever hear. Who is he? Rantau bridge windy, answer.
Bridge with prestressed concrete box construction and a bridge "Free Cantilever" first in Indonesia which was built in 1974, is now already 36 years old. Bridge with a total length of 200 meters, is still strong and mighty. Is this bridge is not passable by heavy tonnage vehicles? Is it just dilalaui by light vehicles only? The answer is certainly not the case.

Probably not many people know, first Pilar Windy Bridge Rantau been felled by the flood. Bridge Project Rantau Berangin crosses over the Kampar River, located about 75 Km from the Highway Pekanbaru Pekanbaru Riau toward Payakumbuh West Sumatra. In 1962, Department of Public Works & Electrical Workers (Dep.PUTL) makes the design of the old (original) This bridge, with Up Building Concrete Girder system uses 10 spans each 20 meters and consists Down Buildings: 2 abutments and 9 Pilar concrete with Foundations Concrete piles. Quality Concrete Reinforced Concrete in accordance with Rule 1955.
In accordance with the time schedule of construction, the bridge deck casting, worked five (5) spans at once, so it is not done for the sake span spans. When the 1960s, knowledge and experience of Consultants and Contractors National still inadequate, the only method of Construction Works Casting concrete bridge deck is cast in situ (cast in place) is to use a wooden scaffolding installed in the local rivers to support formwork concrete floor bridge over it.
In the 1960s, the Consultants and Contractors National has not mastered the method of construction without scaffolding for casting concrete bridge deck and also not familiar with precast concrete for bridge construction works, as does the work of Bridges Rantau Berangin new (built 1974 till now) that use prestressed concrete box girder.
After Scaffolding wood and Formwork upper floors is completed, but has not done casting concrete bridge deck, there was a water-flood large in Kampar River carrying large trees from upstream, crashing and breaking down the entire scaffolding of wood and begisting upper floors as well as knocking out two (two) in situ concrete pillars.
The natural disaster caused the collapse of the construction of the Bridge Project Overseas Berangin and categorized as Force Majeur, so that the contractor is not subject to legal sanctions and fines financially. The project owner to stop all construction activity in this project. Maybe they assess, design errors construction with System 10 Span Concrete Girder, is not suitable to the circumstances of the natural environment at the site of the bridge project. But according to the opinion (sources) of all, that the failure of construction due to the Flood, not Fallacy design but a result of choosing the Method of Construction Work using wooden scaffolding and worked five (5) at the same time span in the rainy season.
Sorry continuation of the story Bridges Rantau Berangin cut short, because I remembered the failure of muddy Kelubi in Kampar bridge some time ago. Is the collapse of the steel frame bridge Kelubi muddy this caused the Flood, also Mistakes Construction Methods, because it also uses Scaffolding Wood? Analysis Srendiri please!
We continue, the story of Rantau Berangin new bridge. Ten years later, in 1972, the Project Owner, Department of Public Works to make a new design Rantau Berangin Bridge with Prestressed Concrete Struktuk-Free Cantilever Systems, the location of the bridge was moved 100 meters towards the river downstream from the location of the old bridge. Fixed bridge 200 meters long, consisting of a central span of 120 meters and a second edge spans, each 40 meters, the contractor of the construction and equipment of PT Waskita Branch Pekanbaru (dated March 15, 1973 Corporate Entity Country transformed into a Limited Liability Company). Implementation foundry Concrete Bridge Floor wear horizontal Verbouw Wagen driven simultaneously from the right and left, each segment of the concrete casting all three (3) meter which finally met in the middle of the floor of the bridge. So Casting Concrete Floor Wood Scaffolding Jembatann not wear anymore, so "safe against flooding".
In closing this article, I present some of prestressed concrete box bridge construction that was built after the bridge Rantau Berangin. There are several bridges in Indonesia are built with prestressed concrete box girder construction carried out by the system cantilever cast-in-place as described above. The use of this construction was not spared from the development of prestressed concrete technology in Indonesia and the selection of construction that is generally constant over the four pedestal so it can be carried out starting from the pillars. Another advantage of the implementation of this cantilever system is the redistribution of moments of the construction of three spans that cross-section of the bridge is more optimal. Noted bridge Maas River in Belgium (1949) is a system of continuous prestressed concrete bridge which was first created in the world.
In Indonesia the bridge of this type were first built, a bridge Rantau Berangin in Riau Province in 1972 and since then no less there are 3 bridges and other similar built with a long stretch of varying namely: Bridges Overseas Berangin (198M), Riau Province with a main span 121m and spans 38,5m semetris side that was built in the period 1972 - 1974. the bridge Rajamandala (222m), West Java province with a main span 132m and 45m semetris side spans built in the period 1972 -1979.Jembatan Serayu Kesugihan (274m), Central Java province with a main span 128m and spans each side of 62m and 84m which was built in 1978 - 1985. the bridge Arakundo (210), the province of Aceh with the main span 96m and 57m semetris side spans built in 1987 - 1990. * **