Chair

Definition

A chair is a device used to support reinforcing bars (rebar) in concrete construction.

Purpose

The purpose of a chair is to ensure that the rebar remains in the correct position during concrete pouring, maintaining the specified spacing and coverage for optimal structural performance.

Examples of Use

1. Concrete Walls: Using chairs to support vertical rebar within wall forms.
2. Bridge Decks: Placing chairs to hold rebar in place on bridge decks before concrete pouring.
3. Roadways: Supporting rebar in highway pavements to enhance durability and load-bearing capacity.

Related Terms

• Reinforcing Chair: A specific type of chair made of fabricated wire for holding rebar.
• Rebar Spacer: Devices similar to chairs used to maintain the correct spacing between rebar and formwork.
• Concrete Cover: The distance between the rebar and the surface of the concrete, crucial for protecting the steel from corrosion.

Notes

• Chairs are available in various materials, including plastic, metal, and concrete, to suit different construction needs and environments.
• Proper use of chairs is essential to achieving the desired structural performance and longevity of reinforced concrete elements.