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Cement Anchor

Tuesday, November 22, 2011
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Cement anchors come in a variety of types, sizes, and materials that are used in different applications requiring different solutions. Some cement anchors are female anchors while others are male type anchors. The female anchor requires a separate bolt and washer to be used and inserted into them, the male anchor protrudes above the surface of the concrete. Cement anchors are also made from different materials. The specific material to use in any particular application depends on the environment that the cement anchor will be installed.

If the cement anchor is being installed in an indoor environment with no moisture present, the zinc plated carbon steel cement anchor can be used. In environments where moisture is present outdoors, then the hot-dipped galvanized or zamac cement anchors may be the best choice. Stainless steel cement anchors should be used in environments where the cement anchor will be submerged in water or where certain chemicals such as salt or chlorine may be present. Each cement anchor comes in specific types of materials since not all cement anchors are made from all materials.

TypeZinc PlatedHot-DippedStainless SteelZamac
Wedge Yes Yes Yes No
Sleeve Yes No Yes No
Drop-In Yes No Yes No
Tapcon Yes No Yes No
Hammer Drive No No No Yes
Lag Shield No No No Yes
Machine Screw No No No Yes
Single No No No Yes
Double No No No Yes

The thickness of the material being fastened to the concrete will help determine the length of the bolt or cement anchor to use. Each type of cement anchor has a minimum embedment depth that it is required to be installed to achieve minimum holding values. This minimum embedment depth must be added to the thickness of the material being fastened plus space for any nuts, washer, spacers, shimming or space to determine either the overall length of the anchor or bolt to use.

The weight of the object that is being attached will determine the diameter of anchor that is chosen. The heavier the object being fastened, then the larger the diameter of cement anchor must be and the deeper the embedment into the cement must be. In most cases, the deeper the embedment, the greater the holding values, especially when the anchor is holding below any type of rebar that has been placed in the cement. The mounting hole in the object being fastened will also determine the diameter of the cement anchor to be used. If the object will be fastened to the cement in place then the cement anchor will have to be inserted through the holes in the item. If this is the case, then the designated diameter of cement anchor must be smaller than the designated diameter of the hole in the item. The reason for this is the designated diameter of a cement anchor refers to the threaded diameter and not to the working end diameter, which is larger than the designated diameter. The diameter of the drill bit used for drilling holes in the concrete is also equal to the designated diameter of the cement anchor and will not fit through the same size hole in the fixture.

Cement anchors must also be spaced a minimum distance from each other as well as a minimum distance from any unsupported edge of the cement. The rule of thumb for the cement anchor is to space them a minimum distance of 10 anchor diameters away from each other and 5 anchor diameters away from any unsupported edge. This requirement will ensure that there is no overlapping of the expansion forces between two anchors and that there is no decreased holding values and breakout.

When installing cement anchors, a hole must first be drilled in the cement. The only way to do this and have the correct dimension hole is by using a hammer drill. The hammer drill must be set in the hammer and rotation mode while drilling a hole in the cement. The hammer motion breaks and pulverizes the cement and the rotation pulls the cement dust out of the hole. A carbide tipped bit must also be used in conjunction with the hammer drill. The carbide tip is designed for long life and is manufactured to meet hole tolerance specifications to meet all cement anchor requirements. The carbide tipped bit used for drilling holes in the cement must meet ANSI standards. ANSI standard bit will ensure that the hole tolerance will meet the anchor diameter requirements.

When installing cement anchors there are a number of installation steps that must be followed which are common for all cement anchors:

  1. Drill a hole in the cement the correct diameter for the diameter of cement anchor being installed. The hole must be drilled with a hammer drill set in the hammer and rotation mode using a carbide tipped ANSI standard bit.
  2. Drill the hole to a depth that is a minimum of 1/2” deeper than the anchor will penetrate the cement, making sure that the cement anchor is embedded after expansion to a depth that meets minimum embedment depth for that type and diameter of cement anchor.
  3. The hole must be cleaned out of all dust and debris, using compressed air, vacuum and wire brush.
  4. Expand the anchor to the required torque value, making sure that the cement anchor does not spin in the hole.

We feature a great selection of cement anchors & fasteners for various purposes. Check-out these anchor options right here online.

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Always use personal protective equipmentAs with any anchoring project, it is important to keep safety in mind and follow instructions carefully. Always remember to wear safety goggles, handle all tools with extra care and follow all technical specifications. This article is meant to serve only as a basic explanation of concrete fasteners. Always refer to manufacturer's instructions or consult a contracting expert during any anchoring project.

Article Written By:
Mike Pistorino, Vice-President Operations

 

 

 

 


Concrete Fastening Systems, Inc. has over 40 years of experience selling concrete fasteners. We can ship out one box or a whole pallet of concrete anchors. Our products are of the highest quality... "your satisfaction is guaranteed". We ship all orders the same day the order is received.

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