Steel bar chair

1.Materials: Low carbon steel  
2.Wire Diameter: 4.0mm-6.0mm 
3.Height: 20mm-400mm 
4.Leg Type: straight leg, bent leg 
5.Leg Surface Treatment: PVC, PE powder Coated, Liquid Coated 
6.Variety: Individual Slab Bolster, Continuous Slab Bolster 
7.Feature: Anti-static, Anti-rust, Good Stability, Save time and cost, Extremely small tolerance

Other Sizes Can Also Produced According to Customers' Need.

Reinforcing steel concrete rebar chair/high chair widly use in support steel of concrete,builings,street construction and bridge buliding.
Steel rebar support chair is welded with new technology, mainly used for big construction industry, as joint linking single or multi-layer reinforced steel bars. With great strength, flexibility, anti-static, and environmental protection, this kind of steel bar support can greatly improve the quality of the project, save cost and time. By using of steel bar support, the construction time can be saved and the speed can be accelerated to reduce the construction cycle.

The Construction Steel Rebar Support Chair/Wire Spacers, also known as wire spacers, are support devices made of steel wire through a new welding technology. They are mainly used in the construction of buildings to provide support for reinforcement mesh and steel bars when laying concrete slabs or formworks. Their legs are protected with a plastic film to prevent rust from penetrating the concrete and causing concrete cancer.

1. High strength and stability: Made of high-strength steel wire, they have high strength and load-bearing capacity, effectively supporting the reinforcement mesh and steel bars and ensuring the stability of the concrete structure.
2. Prevention of concrete diseases: The legs are protected with a plastic film to prevent rust from penetrating the concrete and reduce the risk of concrete diseases.
3. Easy installation and adjustment: The design is simple and easy to install. They can be adjusted as needed to meet different requirements of steel bar spacing and size.
4. Improve construction efficiency: They can be quickly installed and adjusted, reducing construction time and labor costs and improving construction efficiency.
5. Cost-effective: They are produced with new welding technology, resulting in low production costs and relatively economic prices.

1. Determine the installation position: According to the design requirements, determine the installation position and spacing of the wire spacers.
2. Install the wire spacers: Place the wire spacers in the position to ensure a firm contact with the surface of the formwork or foundation.
3. Place the reinforcement mesh and steel bars: Place the reinforcement mesh and steel bars on the wire spacers, ensuring a certain distance between the steel bars and the legs of the wire spacers.
4. Pour concrete: After installing the reinforcement mesh and steel bars, pour the concrete to ensure the complete filling of the formwork and around the wire spacers.

Removal and cleaning: After the concrete solidifies, remove the wire spacers and clean the surface.

1. Material selection: High-strength steel wire is selected as the raw material to ensure the load-bearing capacity of the wire spacers.
2. Wire processing: Use professional wire processing equipment to bend the steel wire into the required shape to form the main structure of the wire spacers.
3. Welding: Adopt new welding technology to weld the various parts of the wire spacers together to ensure the stability and load-bearing capacity of the structure.
4. Surface treatment: Surface treatment such as galvanizing or other anti-corrosion treatment is carried out as needed to improve the durability of the wire spacers.

The wire spacers are mainly used in the construction of buildings to provide support for reinforcement mesh and steel bars when laying concrete slabs or formworks. They can be used in various types of building structures, such as houses, bridges, roads, water conservancy projects, etc.

The price of the wire spacers is relatively low, which is an economic solution for building applications. Their simple design and manufacturing process result in lower production costs, thus providing users with competitive prices.

How to Install Steel Bar Chair for Reinforcement Support 

Proper installation of Steel Bar Chair is essential for achieving precise reinforcement positioning and ensuring the long-term strength of concrete structures. A Steel Bar Chair is a small but crucial component that supports reinforcing bars (rebar) at the correct height before concrete is poured. By maintaining consistent spacing and cover thickness, it ensures the rebar remains properly embedded in concrete, providing maximum structural performance and durability.

Step 1: Understanding the Function of Steel Bar Chair

The Steel Bar Chair is designed to keep rebar in place and prevent it from shifting during concrete placement. It ensures that the reinforcement maintains the correct concrete cover, which is vital for protecting the steel from corrosion and maintaining load-bearing efficiency. Unlike plastic bar chairs, steel versions offer superior strength, high load capacity, and excellent stability, making them ideal for heavy-duty and industrial applications.

Step 2: Preparing the Work Area

Before installation, clean the work surface thoroughly to remove dust, debris, and loose materials that could affect stability. Identify the reinforcement layout according to the structural drawings and ensure all bars are cut, bent, and positioned as specified. Choose the appropriate Steel Bar Chair height based on the required concrete cover—commonly ranging from 25 mm to 100 mm, depending on the project.

Step 3: Positioning the Steel Bar Chair

Place the Steel Bar Chair on a firm and level surface where the rebar will be supported. For slab or floor construction, arrange the chairs in a regular grid pattern, ensuring even distribution to support the entire reinforcement network. The spacing between chairs typically ranges from 0.8 to 1.2 meters, depending on the bar diameter and structural load requirements.

Step 4: Securing the Reinforcement

Lay the reinforcement bars directly over the Steel Bar Chairs, ensuring that each bar rests securely within the saddle or cradle of the chair. For larger or double-layer reinforcement systems, additional bar chairs may be needed to maintain spacing between the upper and lower reinforcement layers. Use tie wire to secure the bars in place if necessary, preventing movement during concrete pouring.

Step 5: Checking Alignment and Stability

Once the reinforcement is positioned, perform a thorough inspection. Verify that all Steel Bar Chairs are upright, evenly spaced, and aligned according to the design plan. Check that the rebar maintains the required distance from the formwork and bottom surface. Any misaligned chairs should be corrected before concrete placement to ensure uniform support and concrete cover.

Step 6: Pouring Concrete Carefully

During concrete pouring, handle the hose or chute gently to avoid displacing the Steel Bar Chairs or reinforcement network. Steel chairs provide strong resistance to movement, but it’s still important to control the flow to maintain accuracy. After pouring, recheck the positions to confirm that the bars remain properly supported.

Conclusion

Installing Steel Bar Chair correctly is a key step in achieving durable, well-reinforced concrete structures. It ensures the rebar stays in its designed position, prevents corrosion, and enhances the structural integrity of the finished element. By following proper installation steps—preparation, positioning, securing, and inspection—builders can ensure that their reinforcement systems deliver maximum performance and longevity in every construction project.

Steel Bar Chair vs. Plastic Bar Chair: Which Is Better?

In reinforced concrete construction, selecting the right type of bar support is essential for ensuring structural stability, durability, and proper rebar positioning. Among the most common options are Steel Bar Chair and Plastic Bar Chair. Both serve the purpose of maintaining rebar at the correct height and spacing during concrete pouring, but their material properties, load capacity, and suitability for different applications vary significantly. Understanding their differences can help builders make informed decisions for each project.

Material Strength and Load Capacity

The primary distinction between Steel Bar Chair and Plastic Bar Chair lies in their material strength. Steel chairs are made from high-quality galvanized or stainless steel, providing excellent load-bearing capacity and resistance to deformation. They can support heavy rebar and multiple layers of reinforcement without bending, making them ideal for industrial floors, bridges, and high-rise structures.

Plastic chairs, on the other hand, are made from polypropylene or other polymers. While lightweight and corrosion-resistant, they generally have lower load capacity. Plastic chairs are suitable for lighter reinforcement layouts, such as residential slabs or small partitions, but may bend or collapse under heavy concrete weight or when supporting dense rebar grids.

Durability and Environmental Resistance

Steel Bar Chairs offer superior durability and long-term performance, especially in environments exposed to high temperature, UV rays, or heavy loads. When galvanized or coated, steel chairs resist rust and corrosion, ensuring that the reinforcement remains stable throughout the construction process.

Plastic chairs are inherently resistant to corrosion and chemical attacks, but they may degrade over time if exposed to direct sunlight or extreme temperatures. In certain harsh conditions, they may lose strength, potentially compromising the proper positioning of reinforcement.

Ease of Installation and Handling

Plastic chairs are lightweight and easy to handle, which can reduce labor fatigue and installation time. They do not require special tools and can be quickly placed on the formwork. Steel chairs, while heavier, provide a more secure and rigid support for rebar. Although slightly more labor-intensive to position, their strength ensures minimal movement during concrete pouring, which is particularly important in large-scale or high-load applications.

Cost Considerations

Plastic bar chairs are generally more cost-effective upfront and are suitable for small or medium-sized projects where extreme load-bearing is not critical. Steel Bar Chairs, while typically more expensive, provide long-term value by preventing deformation, ensuring proper concrete cover, and reducing the risk of structural defects. For large-scale or high-stress projects, the additional investment in steel chairs often results in greater safety and durability.

Conclusion

Choosing between Steel Bar Chair and Plastic Bar Chair depends on the project’s load requirements, environmental conditions, and budget. Steel chairs are ideal for heavy-duty, high-load, or industrial applications, offering superior strength, stability, and longevity. Plastic chairs are suitable for lighter structures and cost-sensitive projects, providing adequate support in less demanding scenarios. By evaluating these factors, builders can ensure optimal rebar placement, concrete cover, and structural integrity in every construction project.

Benefits of Using Steel Bar Chair in Concrete Construction

In modern reinforced concrete construction, maintaining the correct positioning of reinforcement bars is critical to achieving structural stability and long-term durability. One of the most effective tools for this purpose is the Steel Bar Chair. These small yet essential components provide reliable support for rebar, ensuring accurate spacing, proper concrete cover, and overall structural integrity. The benefits of using steel bar chairs in construction projects are numerous and contribute significantly to the quality and safety of the finished structure.

Precise Rebar Positioning

A primary advantage of the Steel Bar Chair is its ability to maintain precise rebar placement. Proper concrete cover is vital to protect steel reinforcement from corrosion and to ensure the structural strength of slabs, beams, and columns. By holding rebar at the designed height and spacing, steel bar chairs prevent movement during concrete pouring, which is especially important in heavy-duty or densely reinforced structures. This accuracy results in consistent load distribution and a longer-lasting concrete structure.

Superior Strength and Load-Bearing Capacity

Compared to plastic alternatives, Steel Bar Chairs offer superior strength and stability. Constructed from high-quality galvanized or stainless steel, they can support heavy rebar without bending or deforming. This makes them suitable for large-scale projects, such as industrial floors, bridges, high-rise buildings, and other demanding construction applications. The robust support provided by steel chairs ensures that even double-layer reinforcement systems remain properly aligned during concrete placement.

Durability and Corrosion Resistance

Durability is another key benefit of Steel Bar Chairs. Galvanized or coated steel chairs resist rust and corrosion, even in humid or chemically aggressive environments. This reliability ensures that the reinforcement remains stable during the construction process and helps maintain the long-term integrity of the concrete structure. Unlike some plastic chairs, steel chairs are not susceptible to UV degradation, temperature fluctuations, or crushing under heavy loads, making them a dependable choice for challenging construction sites.

Improved Construction Efficiency

Using Steel Bar Chairs can significantly enhance construction efficiency. Their design allows for quick and straightforward placement within mortar joints or on formwork, reducing labor time while maintaining precision. Because steel chairs provide rigid support, workers can pour concrete with confidence, knowing that the rebar will not shift. This reduces the need for additional adjustments or rework, saving both time and labor costs on the project.

Enhanced Structural Performance

By keeping reinforcement bars properly positioned, steel bar chairs contribute to the overall structural performance of concrete elements. Accurate rebar placement ensures that loads are transferred effectively, reducing the risk of cracking, spalling, or structural failure. In combination with proper concrete cover, steel bar chairs help create safer, stronger, and more durable structures that meet modern building codes and engineering standards.

Conclusion

The use of Steel Bar Chairs in concrete construction provides multiple benefits: precise rebar positioning, superior strength, durability, corrosion resistance, and improved construction efficiency. By ensuring that reinforcement remains correctly aligned during concrete pouring, steel chairs enhance the safety, longevity, and overall quality of the finished structure. For contractors and engineers seeking reliable solutions for reinforced concrete projects, Steel Bar Chairs are an essential component that contributes to optimal structural performance and long-term value.