Ankernyie dyubeli for front systems

Fixing items are one of the most important elements of any front teploizolyatsionnoy systems. The competent choice dyubeley serves as the lien of a choice quality and durability of front system.

In the given article three cores of the criterion, defining correctness of a choice dyubeley for concrete conditions are considered.

The bearing bases

The bearing bases of buildings are subdivided into three types:

The strong corpulent basis (concrete, a ceramic and silicate corpulent brick);

The strng hollow basis (an alkaline brick, hollow concrete or keramzitbetonnyie blocks);

The porous corpulent basis (gazobeton, gazosilikatnyie blocks).

In modern dyubelnoy to the technician various principles of anchoring can be realised. For each type of the bearing basis the optimum principle of anchoring steals up. So, in the strong bases anchoring by forces of a friction, and in porous - anchoring by the sleeve form dyubelya is used. For what it is necessary?

The porous bases (gazobeton, gazosilikat) have the raised ability to destruction at constant pressure. For this reason for the buildings having the porous basis, is inexpedient to apply dyubeli which anchoring is carried out by forces of a friction. It is necessary to consider, that at anchoring by forces of a friction in gazobetone in an initial stage (till 3 thousand o’clock) are observed comprehensible significances of effort at test dyubelya "on having dug", further the situation considerably worsens, and after the lapse of 10 thousand hours perceived such dyubelem the maximum loads much more decrease. This fact is confirmed by numerous researches (especially comprehensively this property gazobetona was studied in Germany).

Anchoring by the sleeve form dyubelya allows to avoid pressure upon a material or, more precisely speaking, to make its not defining at work dyubelya. Ledges on a sleeve dyubelya form in gazobetone "pockets" which work not on raspor, and on shift of a material BUT. This basic distinction has allowed to reach as much as possible reliable, and the main thing of durable anchoring in such uneasy material, as gazobeton.

The head form dyubelya

This aspect often, at times on the highest and technically competent level, is lost sight. Correctly to evaluate significance of the form of a head in work dyubelya, it is necessary to represent clearly as "works" dyubel: as he perceives and transmits load to bearing basis. By consideration of interaction of a head dyubelya and an arm in system of front system with an air backlash should give special attention influence of the form of a head on this interaction.

For reliable transfer of load from an arm in bearing basis through raspornyiy an element very important that prileganie heads to an arm occurred on a plane.

Unfortunately, in practice pretty often there is an application so-called frame ankernyih dyubeley for fastening of arms. Frame dyubeli have a cone-shaped head "flush" and are applied to fastening of window frames or a wooden bar, they fix the elements having a cone-shaped landing nest or small durability on compression, allowing to generate this nest in the course of installation. At fastening frame dyubelyami the steel or aluminium arms having an aperture under ankernyiy dyubel, head contact dyubelya with an arm occurs at the best on a line, and in the worst (in case of an oval aperture) - in two points. In this case it is not necessary to speak about reliable and durable fastening, after all a polymeric material of a sleeve dyubelya, dividing a head raspornogo an element and the arm, simply will be cut in due course by a sharp edge of an aperture of an arm. It will lead to occurrence lyufta and dangers of destruction of connection. Besides, there is a probability of penetration of a moisture and corrosion occurrence raspornogo an element.

Electrochemical corrosion

The majority of firms-developers of systems recommend to possess ankernyiy dyubel so that an arm and raspornyiy the element was divided by a sleeve dyubelya. Performance of this recommendation is very important, as its realisation excludes probability of occurrence of electrochemical corrosion which arises at availability of pair the metals far standing from each other in an electrochemical number, and conducting environments (water). For example, zinc and aluminium, a steel and aluminium, korrozionno the proof steel and aluminium form steams inclined to electrochemical corrosion.

Electrochemical corrosion is dangerous essential decrease prochnostnyih properties of a material owing to what connection destruction is possible. To avoid occurrence of electrochemical corrosion it is possible, if on a sleeve dyubelya there is the polymeric washer dividing a material raspornogo of an element and an arm of system. Besides, the polymeric washer promotes more uniform distribution of load at a twisting raspornogo an element and interferes with mechanical damage of an arm, for example, prodavlivaniyu.

The article is granted by the journal of modern building technologies "Red line"

Date of the publication 21.06.06

Construction & Building

Ankernyie dyubeli for front systems

Ankernyie dyubeli for front systems