A bridge that is resistant to salt damage, lightweight, high-strength, and does not decay.
Vacuum Infusion The entire glass fiber mat layered on the mold is covered with a film and sealed, creating a complete vacuum state by removing the air from the glass fiber layer. Next, using the power of the vacuum, polyester resin is injected into the glass fiber layer, ensuring it spreads evenly to create a uniform and strong FRP laminate. This manufacturing method is referred to as "Vacuum Infusion (VI)." This technique is also used in the production of large blades for wind turbines and yacht hulls. Laminates produced using this method are used in the structural components of FRP bridges. The high glass fiber content allows for lightweight and strong laminates, and there is the advantage of being able to produce very large laminate sheets. The shape of the mold can be freely designed, whether flat or curved, enabling the creation of elegantly shaped bridge girders.
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basic information
■Design Standards The design of FRP bridges follows the various standards and recommendations indicated in the literature below: Building Standards Act, Road Design Guidelines and Commentary, Technical Standards for Three-Dimensional Cross Structures and Commentary, Guidelines for Small Suspension Bridges and Commentary, FRP Bridges: Technology and Prospects (Japan Society of Civil Engineers), FRP Structural Design Handbook (Reinforced Plastics Association), EUROCODE 1, NEN, DIN, Structural Design of Polymer Composites (Euro Comp Design Code and Handbook, The Dutch Design Code CUR Recommendation). Design standards used for the standard model: Deck: 5.0 kN/m² Main girder: 3.5 kN/m² Deflection limit: L/400 Wind load: 4.5 kN/m² (upwind 3.0 kN/m², downwind 1.5 kN/m²) Earthquake: K0 = 0.2 Snow load: Based on the actual conditions at the installation site.
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Applications/Examples of results
- Iwaya Park Heian Bridge (Kagoshima Prefecture) - Aso Erosion Control Disaster Related Construction (Kumamoto Prefecture) - Nagano Green Space, Kitakyushu City (Fukuoka Prefecture) - Former Minamata Fishing Boat Ironworks Site Side Road Bridge (Kumamoto Prefecture) etc...
Detailed information
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Iwaya Park Heian Bridge This is a construction example of the Heian Bridge in Iwaya Park, Kagoshima Prefecture.
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Heian Bridge at Iwaya Park, Kagoshima Prefecture This is a construction example of Heian Bridge at Iwaya Park, Kagoshima Prefecture.
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Heian Bridge at Iwaya Park, Kagoshima Prefecture This is a construction example of Heian Bridge at Iwaya Park, Kagoshima Prefecture.
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Company information
■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.
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