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 lattice shape, it allows for a thinner reinforcement layer, making on-site work more efficient. It is used for reinforcing the underside and topside of bridge RC slabs, repairing and reinforcing deteriorated box culverts, and reinforcing RC beams. By reducing the thickness of repairs, it enables a reduction in repair loads and ensures the maintenance of internal space. Features of the grid metal method: - It can be processed in the factory to match the shapes of tunnels and box culverts, thus streamlining on-site construction. - Since the vertical and horizontal bars are on the same plane, the reinforcement cross-section can be made thinner, minimizing the increase in dead load and favorably securing 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 available for download.
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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 of 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, labor-saving in on-site rebar work can be achieved ■ Particularly Effective Application Range - Sites where suppression of dead load increase is necessary - Sites where shortening of construction time is necessary - Reinforcement of the underside of slabs and beams ■ Points to Note - Material properties of members should comply with the Road Bridge Design Guidelines and their explanations, and design calculations should be conducted in accordance with the "Design and Construction Manual (Draft) for Reinforcement Method of 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 after 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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Spray concrete After applying the primer, spray polymer cement mortar. 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 photo 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, made from steel plates, allows the main reinforcement and distribution reinforcement to be on one surface, making it possible to be thinner than traditional 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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![024-02 Civil Newsletter [Season Letter] Grid Metal](https://image.mono.ipros.com/public/catalog/image/01/1cc/557429/IPROS73926786050463744622.jpeg?w=120&h=170)
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![035-02 Civil Newsletter [Season Letter] Introduction to Grid Metal Construction Method Projects](https://image.mono.ipros.com/public/catalog/image/01/338/809208/IPROS11666773691619389918.jpeg?w=120&h=170)
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Company information
JFE Civil Corporation has been developing its business in various fields based on its achievements and technical capabilities in maintaining JFE Steel's steelworks for many years. We deliver valuable business from planning to construction and maintenance support. We are the only general construction company in the JFE Group.
