A bridge that is resistant to salt damage, lightweight, high-strength, and does not decay.
Vacuum Infusion The entire fiberglass mat layered on the mold is covered with a film to seal it, and the air from the fiberglass layer is removed to create a complete vacuum state. Next, using the power of the vacuum, polyester resin is injected into the fiberglass layer, ensuring it spreads evenly throughout, resulting in 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 the hulls of yachts. Laminates produced using this method are used in the structural components of FRP bridges. The high fiberglass 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 as either flat or curved, enabling the creation of elegantly shaped bridge beams.
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basic information
■Design Standards The design of FRP bridges follows the various standards and recommendations outlined in the literature below: Building Standards Act, Road Design Guidelines and Commentary, Technical Standards for Overhead Crossing 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 construction 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 in Iwaya Park, Kagoshima Prefecture This is a construction example of 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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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 heavy machinery and do not need 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, which 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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