Rama IX Bridge

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Rama IX Bridge
Rama IX Bridge-2.jpg
Coordinates 13°40′55″N 100°31′08″E / 13.682058°N 100.519001°E / 13.682058; 100.519001Coordinates: 13°40′55″N 100°31′08″E / 13.682058°N 100.519001°E / 13.682058; 100.519001
Carries 6 lanes of roadway
Crosses Chao Phraya river
Locale Bangkok, Thailand
Design cable-stayed
Total length 781.20 m
Width 33 m
Height 87 m
Longest span 450 m
Clearance below 41 m
Construction begin 1 October 1984
Opened 5 December 1987

Rama IX Bridge is a bridge in Bangkok, Thailand over the Chao Phraya river. It connects the Yan Nawa district to Rat Burana district as a part of the Dao Khanong – Port Section of Chalerm Maha Nakhon Expressway.[1]

The bridge was named in honour of King Bhumibol Adulyadej's 60th birthday; the opening date coincides with the King's birthday. It was the first cable-stayed bridge in Thailand[1] and had the second longest cable-stayed span in the world when it opened in 1987.[2]

The original colour scheme, with white pylons and black cables, was replaced with an all yellow scheme representing the King in 2006.[3]

Structure of the bridge[edit]

The steel superstructure includes the bridge, rigged mast, cable. The Main Span of the bridge, which is stretched between two poles has a length of 450 meters. The Main Span is a trapezoid shape 33 meters wide.The bridge has a walkway along its side. The bridgehas two main pylons 3.00 m x 4.50 m. This serves to hold the tension of the cable and weight into the pylon pier. The 121 – 167 mm diameter cables consist of many small wires wound together. The cables vary in lengthfrom 50 to 223 meters can absorb the tension for 1,500 - 3,000 tons.[4]

See also[edit]


  1. ^ a b "Rama IX Bridge". Expressway and Rapid Transit Authority of Thailand. Retrieved 2008-02-01. [permanent dead link]
  2. ^ "Rama IX Bridge - 10th Year Inspection & Evaluation". OPAC Consulting Engineers. 2001. Retrieved 2008-02-01. 
  3. ^ "Strength in yellow". The Nation. 2006-05-10. Retrieved 2008-02-01. [dead link]
  4. ^ Ramkhamhaeng University Library staff (5 November 2008). "Rama9 Bridge" Ramkhamhaeng University Library.Retrieved 2013-10-20.From http://www.lib.ru.ac.th/journal/bangkok/rama9.html

External links[edit]