Top-Peforming Concrete Tie Anchors
Concrete tie anchors can be used to bolt down machinery, construct building and bridges, to repair foundations and hundreds of other uses.
Cast-in-Place Anchor Bolt
During construction cast-in anchor bolts may be set into the wet concrete. The bolt comes already embedded in concrete with the threads sticking up so that something can be attached with a nut and bolt. Cast-in anchors are made into different shapes. Inside the piece of concrete the anchor may have a 90-degree bend. This is called an “L” bolt. If the anchor has a curve like a fishhook then it is a “J” hook. A pigtail anchor is crimped for extra holding power. Some come with a steel plate imbedded. This kind of anchor is used for heavy-duty applications like tying the walls to the foundation to make them more earthquake resistant. These commonly come in diameters of 3/8 inch to 2 inches and lengths from 12 inches to 72 inches. Some are made from 120 KSI steel for more strength per pound than mild steel.
In solid concrete a different kind of tie anchor must be used. One option is the epoxy bolt. An epoxy bolt is put into a predrilled hole and epoxy is pumped into the hole. When the epoxy sets up it is as strong as the surrounding concrete. An epoxy bolt can be used close to an edge or for close spacing. Epoxy bolt have numerous uses such as anchoring a rail system and re-facing dams. These bolts come in diameters from 3/4 inch to 2 inches. They can be order for any length up to 50 feet.
Anchors that are grouted in are similar to epoxy bolts. Although grout bonded anchors take longer to set up and don’t offer the level of strength that an epoxy bolt does. Grout is used in high heat areas and easier to work with than the epoxy which has to be mixed accurately. They come in similar sizes as the epoxy bolts.
A hole is drilled into concrete and the sleeve anchors are inserted in the hole. As the nut is turned the end of the sleeve anchor is expanded to secure the anchor. The common diameters for these anchors are ¼ inch to ¾ inch and up to 6 ¼ inches long. These anchors are either stainless steel or zinc coated.
Another kind of anchor used in existing concrete is a wedge bolt. A wedge is put into a pilot hole and then when the bolt is inserted. The bolt is wedged into the hole for a secure hold. These come in different materials: hot-dipped galvanized, 303 stainless steel and 316 stainless steel. Common diameters available are from ¼ inch to 1 ¼ inches and in lengths from 1 ¾ inches to 12 inches.
A simple-to-use anchor is the concrete drop-in anchor. A drop in anchor is made of steel and includes an expander plug. Once the anchor is tapped into a pilot hole the anchor is expanded by using a setting tool. They come in ¼ to ¾ inch diameters and are fabricated of stainless steel or zinc-plated.
There is a concrete anchor for almost any need. Use the one that provides enough holding power for the load of what you are securing.