[Case Study of Wooden Facility Renovation] Nanayama Truss Bridge
Nanayama Truss Bridge (After Renovation 1)
Appropriate renovation proposals are possible! Introducing cases where FRP materials have been used for the renovation of truss bridges.
We would like to introduce a renovation case of the "Nanayama Truss Bridge" (Karatsu City, Saga Prefecture), which was constructed using foreign timber along a walking course dotted with seven waterfalls and pools. The entire timber showed signs of decay, and we carried out reinforcement work considering both aesthetics and structural integrity. Boron-based insect and decay prevention agents (Impel Rod) were embedded in the decayed areas of the timber, and a protective wood coating was applied over the entire surface. Additionally, the main girder was reinforced with steel to enhance safety. 【Renovation Case】 ■ Renovation Details: Truss Bridge (Width: 2.5m × Length: 29.0m) ■ Materials Used - Structural Material: Bongo wood → Steel - Decking: Bongo wood → Repaired and reused - Handrail: Bongo wood → Repaired and reused Our company is capable of providing appropriate renovation proposals by combining various materials such as steel, aluminum alloys, FRP, recycled wood, and natural wood. For more details, please refer to our catalog or feel free to contact us.
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■FRP materials that are lightweight, have high strength per unit weight, are corrosion-resistant, and are strong against salt damage. ■Pin foundation bases that do not require the use of heavy machinery or excavation of the ground surface. Our company has introduced these two technologies ahead of other companies in Japan and boasts a wealth of construction achievements. We are involved in the design and construction of bridges, decks, boardwalks, and piers in national parks and theme parks that are well-known to everyone. By partnering with a Dutch company and introducing new technology using FRP materials, we have made it possible to construct long-span FRP bridges that were previously difficult to achieve. Furthermore, a durability of over 60 years is expected, making this a technology that can open up new markets in the future.