This is a reinforcement method for RC members using lattice steel plates (steel plates processed in a lattice shape). The reinforcement cross-section can be made thin, and it can reduce labor on site.
■ Grid metal is a product that reinforces deteriorated RC structures by integrating with polymer cement mortar. By processing steel plates into a grid pattern, it allows for a thinner reinforcement layer, making on-site work more efficient. ■ It is used for reinforcing the underside and top side of RC bridge decks, repairing and reinforcing deteriorated box culverts, and reinforcing RC beams. By reducing the repair thickness, it enables a reduction in repair loads and ensures the maintenance of internal space. ■ Features of the grid metal method: ◎ Since it is processed in the factory to match the shapes of tunnels and box culverts, it can streamline on-site construction. ◎ With vertical and horizontal bars on the same plane, the reinforcement cross-section can be made thinner, minimizing the increase in dead load and favorably ensuring internal space. ◎ By applying corrosion protection treatments such as hot-dip galvanizing and epoxy resin coating, it excels in corrosion resistance and contributes to the longevity of structures. * For more details, please request materials or view the PDF data from the download section.
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basic information
■ NETIS Registration (Publication Period Ended) Reinforcement Method for RC Members Using Grid Metal Registration No: QS-150039-A (Subtitle) Reinforcement Method for RC Members Using Steel Plates Processed in a Lattice Shape ■ Road Maintenance and Repair Work - Bridge Repair and Reinforcement Work - Upper and Lower Surface Thickening Work ■ Bridge Superstructure - Steel Bridge Deck Work ■ Common Work - Box Culvert Work - Others ■ A method for reinforcing existing RC structures by integrating lattice-shaped processed steel plates (grid metal) with sprayed polymer cement mortar. ■ Expected Effects - Using grid metal improves workability and shortens construction time. - Integrating grid metal with polymer cement mortar makes it easier to check the condition of the reinforcement surface. - Since the vertical and horizontal bars are integrated, it reduces labor for on-site rebar work. ■ Particularly Effective Application Range - Sites where it is necessary to suppress dead load increases. - Sites where construction time reduction is required. - Reinforcement of the underside of slabs and beams. ■ Points to Note - Material properties of members should comply with the Road Bridge Design Specifications and their explanations, and design calculations should be conducted in accordance with the "Design and Construction Manual (Draft) for Reinforcement Method for RC Members Using Grid Metal." * For more details, please refer to the PDF materials or feel free to contact us.
Price range
P2
Delivery Time
※Two months from the approval of the drawings.
Applications/Examples of results
Construction Achievements - Reinforcement of RC concrete beams (private factory) - Surface repair of concrete slabs (Tochigi Prefecture, Chichinoki Bridge) - Bottom reinforcement of concrete slabs (Tochigi Prefecture, Chichinoki Bridge longevity improvement project) - Interior repair of box culverts (Chiba Prefecture, Nakahara Bridge repair project) *For more details, please refer to the PDF materials or feel free to contact us.
Detailed information
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Grid metal installation status Grid metal is installed using fixed brackets with concrete anchors. The pitch of the fixed hardware will be 400 mm to 500 mm.
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Sprayed concrete After applying the primer, polymer cement mortar is sprayed. Ensure that the mortar is sufficiently filled between the grid metal and the existing concrete (approximately 1 cm) during construction.
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Completion photos of the construction. After the spray mortar work, the surface will be finished with plastering work.
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Grid metal beam reinforcement This is a repair work for deteriorated beams in RC structures. The grid metal is manufactured in a factory and installed using a crane. Since there is no rebar work, on-site labor can be reduced.
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Outline diagram of grid metal installation Grid metal is integrated with polymer cement mortar as a repair and reinforcement material for existing concrete, increasing the thickness of the existing concrete.
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Comparison with conventional methods Grid metal can be manufactured from steel plates, allowing the main reinforcement and distribution reinforcement to be on the same surface, making it possible to be thinner than the thickening reinforced with rebar. This method is advantageous for reducing dead loads in repair work and securing the internal space for box culvert reinforcement.
Line up（3）
| Model number | overview |
|---|---|
| LA-6-100/12G | Grid Metal Type A (Expanded Type) Thickness 6mm Equivalent to D10 (Plated) |
| LA-9-100/15G | Grid Metal Type A (Expanded Type) Thickness 9mm Equivalent to D13 (Plated) |
| LA12-100/24G | Grid Metal Type A (Expanded Type) Thickness 12mm Equivalent to D19 (Plated) |
catalog（6）
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Company information
JFE Civil Corporation has been developing its business in various fields based on its track record and technical expertise in maintaining JFE Steel's steelworks for many years. We deliver valuable business from planning to construction and maintenance support. We are the only comprehensive construction company in the JFE Group.