Wedge anchor, according to the provisions of the relevant GOST standard, outwardly looks like a pin, the working part of which resembles a cone. The design features of the bolt and the principle of operation of the product make it possible to securely fasten structures that differ in size and significant weight indicators.
How to determine the right type of anchor bolt for a particular type of surface, how to hammer in studs and fasten structures without worrying about their reliability? Read all about it below.
Scope of anchors
This efficient fastener is widely used in both capital construction and home renovations. The use of an anchor wedge is appropriate when on the surface of a wall, floor or ceiling made of durable material (concrete, brick, etc.), it is required to securely fasten an object of large size and impressive weight.
The safety of such structures is ensured by the design and material used for the manufacture of wedge anchors. It is a galvanized steel with exceptional strength.
High requirements for bolts are also imposed due to their use in the installation of elevator shafts, cable routes, highly loaded elements of staircase structures. Therefore, the reliability and durability of products should not be doubted. It is extremely important, when using fasteners during construction, to follow the installation rules.
Among the bolts and fasteners, a special place is given to ceiling anchor bolts, which are used to securely fix heavy and large chandeliers on the ceiling surface.
Features of the correct choice of wedge type anchor
Products, depending on the length, are mounted in holes at different depths. Anchor studs with a longer length are placed in deep holes. Under 40 mm bolts drill a hole with a depth of 27 mm, and for anchors with a length of 80 mm - at least 40 mm. There is a direct relationship between the length of the anchor stud and the thickness of the fastener of the part fixed with it.
According to GOST, the length of the bolts starts from 40 mm. Increasing in increments of 5 mm, the wedge anchor reaches 10 cm in length, and sometimes more. A distinctive feature of this type of mount compared to others is the absence of a protective jacket.
Things to consider when choosing anchor bolts
When choosing products, pay attention to parameters such as:
- maximum working load that this type of product can withstand;
- leveling load limit.
These two parameters are closely related. The working load corresponding to each of the anchor bolt sizes must not exceed 25 percent of the leveling load limit parameter. The value of the allowable load is the main indicator that you should pay attention to when selecting bolts for fastening in concrete building structures in order to ensure their reliability and high strength. Therefore, with high concrete strength, pay attention to the permissible load of the wedge anchor, which should differ in increased values.
Features of anchor bolts
Check out the features of the popular bolt models shown in the tables below.
When buying such bolts in a hardware store, pay attention to the compliance of the declared parameters with GOST, and it is better to refuse to purchase on the market.
How to check if a bolt conforms to the standard
The only and true confirmation of the fact of compliance with GOST is the presence of a product certificate in the package of documents of the trading company. It is worth paying attention to this factor because, regardless of the size, a wedge anchor of 12 cm or less is used for the installation of critical structures, the reliability of which in 99% of cases depends on the safety of human life.
Features of installation and dismantling of bolts
When installing the anchor wedge, which works according to the expansion principle, there is no need to strictly control the depth of the hole for installing fasteners. The principle of operation of such an element asAn anchor with a high degree of wedging consists in tightening the nut on its threaded part, while the sleeve moves along the tail and thereby starts the internal strut. Externally, the elements of the wedge anchor up to 20 cm engage with the inner walls of the groove, bursting it, thereby ensuring high reliability of fixation inside the wall.
Anchor wedge installation steps
Works are performed in the following sequence:
- In the building structure, a hole is drilled in the place where the wedge anchor is supposed to be fixed. Its diameter must clearly correspond to the cross section of the bolt.
- The groove made, if desired, is subjected to pre-cleaning, immediately before the introduction of an anchor with a high degree of wedging into it, but this item is not mandatory. It will be enough to remove building dust and the remains of crumbling concrete or brick from it.
- After preparing the hole, insert the anchor. You can hammer it into the wall using a hammer.
- After completing the above manipulations, proceed to the connection of the wedge bolt and the landing part of the object to be fixed. Use the special nut that comes with the anchor for this. When it rotates, the plane of the structural element being fixed is pressed tightly against the surface of the wall or another plane, in parallel, the internal clamp is activated, opening inside the hole and forming a reliable connection.
Mounting the 16 cm wedge anchor mount, withthe concept of which you have already familiarized yourself with, please note that in the future it may be necessary to carry out dismantling work. To carry out such a procedure without damaging the surface, it is recommended to make holes for the bolts with a margin, making the depth slightly greater than the anchor itself. A stud installed in such a hole is easily released from the top nut.
After removing the fixed structure, the stud is only hammered into the groove to the level of the wall. The remaining hole will be more accurate and will not be as large as in the case when, out of ignorance, the “masters” are hacking the wall. The attachment point on top is sealed with cement mortar or putty and lightly sanded to give an aesthetic appearance.
Anchor bolts, reliable and durable, great for large-scale construction work. You can’t say bad things about them in terms of technical or operational characteristics. The only drawback of such material is the impossibility of reuse.
Now you know how it looks, is classified and mounted such a simple fixture that works according to a unique scheme. Anchor wedge is the best fastening option for large structures. However, you yourself have already understood this, having read the information given in the article.
