Continuous High Chair Upper CHCU

The Secret Weapon of Strong Concrete: High Chair Upper (CHCU)

In the world of concrete construction, especially when building beams, slabs, and columns, there’s a little guy doing a big job: the High Chair Upper (CHCU).

Here’s why these aren’t your average high chairs:

• Built to Last: CHCUs are typically made of tough steel. Why? Because they need to be strong, durable, and resist rust. They might even get a special galvanized or epoxy coat for extra protection, especially if they’ll be around a lot of moisture or harsh chemicals.
• Small but Mighty: Think of a tiny, sturdy chair. That’s basically what a CHCU looks like – a small metal bar bent into a specific shape, like a U or a rectangle. This design keeps the rebar (reinforcing steel bars) nice and stable inside the concrete.
• The Lifesaver for Rebar: The main job of a CHCU is to hold the rebar up off the ground at the exact distance needed from the bottom of the concrete form. This makes sure the rebar is in the right spot within the concrete, with enough concrete surrounding it (called “cover”). This cover is crucial for protecting the rebar from rust, fire, and other bad stuff that can weaken the concrete over time.
• Continuous Support: Unlike those separate chair things you might imagine, CHCUs run in a continuous line, giving the rebar constant support along its entire length. This even distribution of weight helps prevent the rebar from sagging or moving out of place when the concrete gets poured.
• Adjustable for the Perfect Fit: Some CHCUs can be adjusted to different heights or have extra attachments. This allows for flexibility depending on how thick the concrete needs to be and where the rebar needs to be placed according to the project plans.
• Works with Everyone: No matter what kind of formwork system or construction method is being used, CHCUs are designed to work with them. This makes them a versatile tool used in both big commercial buildings and smaller residential projects.
• Easy Does It: Putting in CHCUs is pretty straightforward. They’re simply placed at regular intervals along the rebar and then secured to the formwork or the ground below using wires or other fasteners. Getting them installed right is important to make sure they do their job effectively while the concrete cures.