To beat or not to beat? I mean, is it worth driving a nail into a concrete wall? And are there any more efficient ways of fastening? Answers to these questions are given by the proposed article, which tells about modern fasteners – anchors. There are a great variety of anchors, for example: LAH drop in anchor, RA screw anchor, KA wedge anchor, TA rod anchor, SORMAT embedded anchor, MTA, PFG, KVTM, OLA, DRIVA anchors, MSA brass anchor, RU anchor rod, etc., etc. ., etc..
In the production of construction, decoration or repair work, it is impossible to do without fasteners. These can be nails or screws, that is, products that directly themselves, without additional devices, are able to fasten the material and bear the corresponding load. When applied to wood, plasterboard or thin metal elements, the adhesion between such simple fasteners and the material is sufficient to securely hold and absorb structural loads..
At the same time, if the base consists of concrete, stone or brick and has a higher hardness compared to light building materials, then the use of such fasteners cannot solve the arising problems. It is enough to try to drive a nail into concrete to make sure that this statement is true..
Anchor in translation from German means “anchor”, and this name explains the principle of its action. The fastening element mates with the base array not directly, but through an anchor or a dowel, which create the necessary adhesion moment. Strictly speaking, it is difficult to make a clear distinction between anchor and dowel. In our opinion, an anchor or dowel is an element that in a certain (mechanical or chemical) way increases the adhesion between the main fastener and the base to the required level. In fact, the dowel is a lighter type of anchor.
The scope of anchors in construction is the fastening of critical heavy structures. In the apartment, anchors are used mainly for the installation of window and door frames, when making a false ceiling, as well as for installing chandeliers.
Drop-in anchors LA, LAH. This is the simplest type of female anchor. It is used for installation in concrete, stone or brick structures. It is mounted in a pre-drilled hole of the required depth and diameter. The hole for this type of anchors (as, indeed, for all others) must first be cleaned. After installation in the hole, the anchor is expanded with the help of a special device, which ensures a reliable degree of fixation. After that, a fastener corresponding to the thread is screwed into the anchor. This type also includes the multifunctional anchor MTA, which is used for bases with internal cavities..
Wedge anchors KA. Available in electro-galvanized KA, hot-dipped galvanized KAK and acid-proof KAH. Equipped with a special wedge that expands and locks into the socket during installation. Allows push-through installation through the base material. It is placed in a prepared hole, hammered in and tightened with a wrench. The products of the same type include RA – electro-galvanized screw anchors, or RAR – stainless steel. These anchors are equipped with a countersunk screw, which allows them to be used for the installation of window and door frames. As the screw is tightened, the anchor wedge is firmly fixed in the hole.
The RU anchor rod, which acts as a wedge anchor, is designed for deep installation through several successive layers of cladding and insulation. An additional advantage of such a product is the ability to install it at an angle. An expanding wedge clamping mechanism is also used in the TA rod anchor. A similar internally threaded part, in combination with a rod that is trimmed to the required length, if necessary, can be used to mount multiple layers of material. After the anchor is driven into the hole, the material to be fastened is fixed to the rod with a nut and washer.
PFG anchors are internally threaded and expand when the inserts are screwed into them and securely fasten in the socket. The PFG anchor can be used in combination with VR cone bolt, IR insert bolt, AK hook bolt, SR eye bolt or IH, IHH insert sleeves. Used for hard substrates.
Brass anchor MSA
Brass anchor MSA. The structural basis for this anchor is concrete or brick. The MSA brass anchor sleeve has a tapered (threaded) inner cavity that tapers towards the tip. Due to this, as the screw is tightened, the sleeve expands in width and is tightly pressed by its rough walls to the inner surface of the hole in the base.