Concrete Anchors
Table of content: 1. What is concrete anchors.
2. Types of concrete anchors.
- Masonry and concrete anchors – These are designed to anchor and secure concrete, block and brick. There are multiple types of concrete anchors available, including concrete screws, hammer-in anchors, lag shields, lead screw anchors, plastic wall plugs and more.
- Drywall anchors – Also known as hollow wall anchors, these are best suited for hollow walls to provide a strong base for the hold. Types of drywall anchors include cement board screws, expansion anchors, threaded anchors and toggle bolts.
A Concrete Anchors are Join concrete with other types of objects like metal, wood, plastic, machinery, and even more concrete elements.
The types of concrete are used for different purposes as light duty concrete Anchors are used for hanging towel, doors and other objects under 50lbs means 22.7kg to concrete wall.
Anchors make it easier to insert screws directly into a thicker wall or surface and are designed to hold as much weight as the wall they’re attached to can bear. Use a hammer drill when installing anchors into hard surfaces such as stone, concrete and brick.
If you want to build a concrete structure more secure and stable in nature then use anchor bolts for concrete, a footing mostly connected with concrete anchors can be a great solution.
Concretes are a great material for any type of foundation. It is very dense, more workable, affordable, weather–resistant, and very strong.
Medium duty concrete anchors are mostly used for holding weights up to 200 lbs means (90.7 kg). These types of anchors are used for securing heavier objects such as hanging T.V.
Heavy Duty Concrete Anchors are designed for construction purposes. These can behold weights of over 200 lbs means (90.7 kg). It is used to secure the foundation with just about other materials.
If you are building a house on top of concrete without anchoring it down then a flood or bad storm could lift it off the foundation.
Types of Concrete Anchors
The several types of Concrete anchors are given below with a brief description.
1. Wedge Concrete Anchors:
A Wedge concrete anchor is named after the wedges that open and expand up to 1/16” at the anchors base .when the bolt is tightened.
This is a male concrete anchor which is used for fastening to the base of concrete by the use of a nut and washer.
Also, the wedge concrete anchors are widely used because it is easy to insert, corrosion-resistant and among the strongest concrete anchors.
It is actually a stud constructed of two adjoined pieces one-piece is threaded at the top end and the other end consists of a process that includes a wedge and clip that is expanded between the stud and the wall of the hole in the concrete.
The wedge concrete anchors are generally a good option for a heavy shear application and for heavy load. Also the heavier duty seismic wedge anchors are used in areas frequented by seismic activities.
A couple of things are to keep in mind regarding wedge anchors:
The holes drilled into the concrete for a wedge anchor should be equal to the diameter of the anchor.
Also, it is used for solid concrete only not for stone, mortar, brick, etc.
2. Concrete Sleeve Anchors:
A Concrete Sleeve Anchors are male fasteners and It consists of a threaded bolt enveloped by an expander sleeve at the top end and a washer and nut at the other end.
The Sleeves anchors are threaded through the fixture and into the pre-drilled hole in the concrete, stone, brick and mortar.
The action of turning the bolt on the nut pulls the bolt up through the sleeves causing the sleeve to flare out up to 1/8”.
3. Split Drive Concrete Anchors:
These split Drive concrete anchor got their holding power from the source of resilient composition of the piece of one anchor itself.
Also this anchor is male fasteners with a split expanded base. Generally, it is suitable for light-duty tasks and suitable for block, concrete, brick, and stones base.
Most important things keep in your mind when you install split drive concrete anchors,
The diameter of the anchor base is similar to the size of the drilled out hole.
4. Stud concrete anchors:
The sleeve concrete and wedge anchors are used as a tighten nut so that the anchors expand a lot against the hole or sides of the walls. The stud anchor also expands.
But when you expand a stud anchor then you need hammering on the top portion of the anchor.
The expansion anchors are threading on the top end portion and the bottom end at that time drill holes have consisted of a vertical slit.
At the bottom end of the stud anchor, there is a hole that sits on the tapered shaped steel plug.
When you apply a hammer onto the top portion of the stud then the bottom part of the steel stud will e forced to e set over the tapered steel.
This makes the stud expand against the side or wall of the hole.
5. Lag shield concrete anchors:
Lag shield concrete anchors are female type of anchors and they having sleeve that is tapered and ripped in shape and texture. The lag concrete anchor sleeves are made of a zinc alloy material and the sleeves are plain in nature.
These sleeves are placed into the pre-making drill hole base that could be a mortar, concrete, brick, stone, etc.
These lag screws are goes inside and expand that zinc material sleeve, and then cut the threaded portion of the anchor.
That lag concrete anchors are pressed inside the exterior wall of the base materials. Depending upon the diameter of a bolt that is supposed to go inside the screw then the lag concrete anchor is designed according to their embedded length.
Generally, the longer lag anchors are having a stronger and adequate grip that holds the base material.
Another side the lag concrete anchor is short then it is dense and hard.
6. Self drilling concrete anchors:
A self-drilling concrete anchor is a name suggested as the anchor itself has its own teeth which means it is cutting holes into the concrete base by itself.
The top end of this anchor has internal threading and tapered shaped steel plug too. So that bolt can easily be screwed into it.
When you drill the shell on the tapered steel plug with the help of hammering, the bottom end of the shell will end up expanding while bearing the walls or side of the hole.
7. Drop In concrete anchors:
Sometimes confused with widge anchors because they expand similarly, drop in anchors are female anchors that are placed in a pre–drilled hole.
The expander plug at the anchor’s base is set using a setting tool which is essentially a steel rod with one end necked down.
The necked-down portion of the tool is inserted into the drop–in anchor and tapped with a hammer until the lip of the anchor meets the lip of the setting tool.
Like the wedge anchor, drop-in anchors are intended for solid concrete only and can’t be used effectively in brick, block, mortar, or stone.
8. Machine screw concrete anchors:
It's a female anchor this type of fastener consists of a cylindrical base inserted into a pre-drilled hole in brick, mortar, stone and concrete.
These anchor screws are threaded through the fixture and into the base and hole, and the setting tools are used for turning the screw.
As the screw turns down into the base, it is expanding the base for securing the anchor in the hole, thereby fastening the fixture to the surface of concrete.
Each machine screw anchors have specific setting tools these are determined by the diameter of the machine screw anchor being used.
The anchors are properly set when the lip of the setting tools meet the lip of the anchor.
But the main point is a, for machine screw anchors, the hole size required is larger than the anchor size being used.
9. Strike anchors:
Strike anchors are male fasteners and it is used to join lightweight fixtures such as shelf brackets, conduit and electrical boxes to solid concrete.
The strike anchors are an impact expansion fastener consisting of a tabular body capped by a drive pin that is expanded from the tubular casing.
When the strike anchors are inserted into the pre-drilled hole then the head of its pins are driven further into the tube via hammer strikes, expanding the tube and creating the necessary hold within the hole.
The hole diameter to be drilled for the strike anchors are the same diameter as that of the anchor to be used.
Strike anchors enable long runs of fixtures to be quickly installed but once placed then not removable.
