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    How to choose the plug?

    Fasteners are one of the most important elements of any facade insulation systems. Plugs right choice is the key to high-quality and durability of the front system.

    This article focuses on three main criteria that determine the selection of dowels for concrete conditions.

    support base

    The bearing base buildings are divided into three types:

  • robust full-bodied base (concrete, ceramic and sand-lime brick);
  • robust hollow base (alkaline bricks, hollow concrete blocks or keramzitbetonnye);
  • bodied porous base (concrete, gas silicate blocks).

     

    In the current peg technique can be implemented various principles anchoring. For each type of support base selected optimum anchoring principle. Thus, in the solid bases used anchoring by friction, and in the porous - Anchoring dowel sleeve form. Why is this necessary?

    The porous bases (concrete, gas silicate) have an increased ability to fracture at a constant pressure. It is for this reason that for buildings with porous substrates, it is inappropriate to use anchors, anchoring which the forces of friction. It should be noted that the anchoring forces of friction in the aerated concrete in the initial period (up to 3 thousand hours) there are reasonable force values ​​when tested anchors " on digging ", hereinafter situation has markedly deteriorated, and after 10 thousand hours of perceived such a dowel maximum load is much reduced . This fact is confirmed by numerous studies (especially the property thoroughly aerated studied in Germany).

    form Anchoring sleeve plugs to avoid pressure on the material or, more precisely, to make it not decisive in the dowels. The protrusions on the sleeve plugs formed in the aerated concrete " pockets ", which do not operate on the thrust and shear material NO. This fundamental difference has allowed to reach the most reliable, and most importantly durable anchoring in such a difficult material as aerated concrete.

    The shape of the head dowels

    This aspect is often, sometimes at the highest level and technically competent overlooked. In order to properly assess the value of the form of the head in the plugs, you must clearly understand how to " work " plug: it receives and transmits the load of the support base. When considering the interaction between the head and arm plugs in the front system with an air gap, special attention should be paid to the impact on the shape of the head is the interaction.

    In order to reliably transmit the load from the bracket in the support base through the spacer is very important to fit the head to the arm occurred on the plane.

    Unfortunately, in practice very often the use of so-called common frame anchor dowels for mounting brackets. Frame dowels are tapered head " countersunk " and are used for fixing window frames or wooden beams, they fastened elements having a tapered bore of a small or compressive strength, enabling it to form a slot during installation. When mounting frame anchor brackets of steel or aluminum, having a hole for the anchor dowel dowel head contact with the bracket in the best case it occurs along the line and in the worst (in the case of an oval hole) - at two points. In this case, it is not necessary to speak about the reliability and durability of fastening, because the polymer material sleeve plugs separating the head spacer and bracket will be simply cut with a sharp edge time bracket holes. This will result in backlash and risk of breaking the connection. In addition, there is the likelihood of moisture and corrosion of the spacer.

    How to choose the plug?

    Electrochemical corrosion

    Most companies have systems developers recommend anchoring the dowel so that the bracket and the spacer sleeve anchors shared. Implementation of this recommendation is important because it eliminates the likelihood of the realization of galvanic corrosion, which occurs in the presence of a pair of metal facing away from one another in the electrochemical series, and the conducting medium (water). For example, zinc and aluminum, steel and aluminum, corrosion-resistant steel and aluminum form a pair inclined to electrochemical corrosion.

    Electrochemical corrosion dangerous a significant reduction in the strength properties of the material, resulting in the destruction of possible connections. Avoid galvanic corrosion can if dowel sleeve has a polymeric washer, separating the material of the spacer and bracket system. In addition, the polymer puck in a more even distribution of load in the tightening spacer and prevents mechanical damage to the arm, for example, burst.

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