Improvement of Dry Air Injection System for main cables of Seto- Ohashi Bridges
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Bibliographic Details
| Author(s): |
Shigeki Kusuhara
(Honshu-Shikoku Bridge Expressway Co., Ltd., Kobe, JAPAN)
Akira Moriyama (Honshu-Shikoku Bridge Expressway Co., Ltd., Kobe, JAPAN) Muneo Okawa (Honshu-Shikoku Bridge Expressway Co., Ltd., Kobe, JAPAN) Yoshiya Sakamoto (Honshu-Shikoku Bridge Expressway Co., Ltd., Kobe, JAPAN) |
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| Medium: | conference paper | ||||
| Language(s): | English | ||||
| Conference: | IABSE Conference: Structural Engineering: Providing Solutions to Global Challenges, Geneva, Switzerland, September 2015 | ||||
| Published in: | IABSE Conference Geneva 2015 | ||||
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| Page(s): | 1400-1407 | ||||
| Total no. of pages: | 8 | ||||
| Year: | 2015 | ||||
| DOI: | 10.2749/222137815818358745 | ||||
| Abstract: |
A “Dry Air Injection System for main cables (DAIS)” was developed by the Honshu-Shikoku Bridge Expressway Co., Ltd. (HSBE), in order to keep in sound condition of the main cables over the long term. And the DAIS was installed to the Akashi-Kaikyo Bridge as the first case in the world. In parallel with installation of the DAIS in new bridges, the HSBE also installed the DAIS in all the existing HSBE’s suspension bridges, in which progressive corrosion of the cable wires was observed. After approximately ten years of the DAIS installation, the monitoring data in the Seto- Ohashi Bridges showed that Relative Humidity (RH) of inside the cables still remained high in some portions. Through a trial and error process, we made improvements of the DAIS, which mainly composed of alteration of injection points, in order to keep RH of the entire length of the cables less than a target value (40%RH). This paper describes improvements of the DAIS and its results. |
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| Keywords: |
suspension bridge main cable monitoring dry air injection system anti-corrosion
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