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Management of Dry Air Injection System for Main Cables of Suspension Bridges in Honshu-Shikoku Bridges for 20 Years

 Management of Dry Air Injection System for Main Cables of Suspension Bridges in Honshu-Shikoku Bridges for 20 Years
Auteur(s): , , , ,
Présenté pendant IABSE Symposium: Long Span Bridges, Istanbul, Turkey, 26-28 April 2023, publié dans , pp. 607-614
DOI: 10.2749/istanbul.2023.0607
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Main cables are the most important components of suspension bridges and require reliable corrosion protection because they are difficult to replace. In the past, corrosion protection has been perfo...
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Détails bibliographiques

Auteur(s): (Honshu-Shikoku Bridge Expressway Co., Ltd. Kobe, Japan)
(Honshi-Expressway Bridge Engineering Co., Ltd. Kobe, Japan)
(Honshu-Shikoku Bridge Expressway Co., Ltd. Kobe, Japan)
(Honshu-Shikoku Bridge Expressway Co., Ltd. Kobe, Japan)
(Lehigh University, Bethlehem, Pennsylvania, USA)
Médium: papier de conférence
Langue(s): anglais
Conférence: IABSE Symposium: Long Span Bridges, Istanbul, Turkey, 26-28 April 2023
Publié dans:
Page(s): 607-614 Nombre total de pages (du PDF): 8
Page(s): 607-614
Nombre total de pages (du PDF): 8
Année: 2023
DOI: 10.2749/istanbul.2023.0607
Abstrait:

Main cables are the most important components of suspension bridges and require reliable corrosion protection because they are difficult to replace. In the past, corrosion protection has been performed mainly by coating the cables to block moisture. In 1989, after six years of service, inside of the main cable of the Innoshima Bridge was investigated. As a result, water was found inside the main cable and corrosion was confirmed on the surface of the galvanized steel wire. This revealed that conventional methods alone were insufficient to prevent corrosion. Because of this fact, investigation of effective methods of main cable corrosion protection under Japanese climate was started. As a result, a dry air injection system was developed to prevent corrosion by injecting dry air into the cables. The system was adopted for the first time in the world for the Akashi-Kaikyo Bridge in 1997 and the Kurushima Kaikyo Bridge in 1999. In addition, the dry air injection system was installed on six existing suspension bridges, including the Ohnaruto Bridge, from 1997 to 1999. More than 20 years after the system was introduced, the relative humidity in the main cables has become stable on all suspension bridges of the Honshu-Shikoku bridges. This paper presents the maintenance, improvement, and future prospects of the dry air injection system for the Akashi-Kaikyo Bridge, the first newly constructed suspension bridge to adopt the system, and the Ohnaruto Bridge, the first existing suspension bridge to adopt the system.

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