Translation of "Cracked concrete" in German

The Screw Anchor even has ETA approval for cracked concrete.

In addition, it is possible to perform nonlinear analysis (cracked concrete).

As a result, only compression forces act on the core of mortar which has hardened in the drilled hole, to increase the holding values in particular in the case of cracked concrete.

This means that cracked, chloride-damaged concrete can effectively be protected against corrosion of the steel reinforcement by means of the process described.

Overall, the bolt anchor FAZ II scores points with its high load-bearing capacity in cracked concrete and its suitability for numerous fixing jobs in various trades.

For one, the Cracked Concrete Wall Mural can be placed on the outside walls of your house, specifically in the garage.

The dilemma described above, in which one coefficient of friction or the other is advantageous, depending on the application, may thus be solved, and on the one hand particularly good static performance is obtained in the event of tensile loads in uncracked and cracked concrete, and on the other hand particularly good static performance in the dynamic or seismic case and/or particularly high robustness in the event of an opening and closing crack are/is also obtained.

For example, also when the expansion plug is used in pulling zones, that is to say, in cracked concrete, there could be a need for a corresponding post-expansion after the initial expansion.

Moreover, an excessively high coefficient of friction can be disadvantageous when it comes to dynamic cracks in cracked concrete.

Therefore, in the case of cracked concrete, a low coefficient of friction can be advantageous in order to ensure “pumping”, in other words, a back-and-forth sliding movement of the slanted surface in the expansion sleeve in response to the opening and subsequent closing of the crack.

In particular, the above-mentioned compromise between good properties in cracked concrete and high static pull-out loads can be remedied.

As a result, a very reliable anchor with the usual dimensions can be obtained that exhibits good properties in cracked concrete with dynamic cracks as well as high static pull-out loads in concrete that is not cracked.

Experiments and simulations have shown that this yields an expansion anchor that has particularly good load properties, especially in cracked concrete, and that, at the same time, is very simple and cost-effective to produce.

In this context, the invention has recognized that the good load properties in cracked concrete can be due to the residual pre-tension that occurs in the stud of a pre-tensioned anchor after a crack in which the expansion anchor is situated has opened up somewhat, for example, by 0.3 mm to 0.5 mm.

The invention has also recognized that the high residual pre-tension values and thus the better anchoring in cracked concrete and consequently the very good load properties of the expansion anchor according to the invention can be ascribed to the interaction of the front end area of the expansion sleeve with the surrounding concrete material.

Finally, the invention has recognized that, on the one hand, a high sleeve hardness of more than 350 HV can bring about the above-mentioned advantages in cracked concrete but that, on the other hand, the high sleeve hardness can also be disadvantageous, for example, in terms of the manufacture of the expansion sleeve and/or of the load properties of the anchor in other load situations.

Here, as a rule, the low strength in the rear area does not have a detrimental effect on the load properties in cracked concrete since the above-mentioned mechanism only takes place at the front end of the sleeve.

The invention solves this dilemma in that the high sleeve hardness is only provided in certain areas, namely, in the front sleeve area that is pressed against the surrounding wall of the drilled hole under the load exerted by the expansion cone, where the high sleeve hardness can thus bring about the above-mentioned advantages in terms of the load properties in cracked concrete.

This high coefficient of friction between the expansion element and the stud, in turn, can ensure very high pull-out loads on the installed anchor, especially in cracked concrete as well.

The fixing mortar systems according to the invention surprisingly also exhibit especially good properties in respect of their effectiveness in the tension zone, that is to say in cracked concrete, using normal threaded rods.

As already mentioned, the fixing systems in accordance with the present invention are therefore especially suitable for use in processes or methods for fixing anchoring means in cracked substrates, especially in cracked concrete, in each case constituting preferred forms of implementation of the invention.

Due to the expansion effect, when the anchor rod is under stress, the normal forces (tensile forces) acting thereon are converted into radially acting expansion forces so that this fastening arrangement can subsequently expand and can therefore also be applied in the tensile zone of a component or in cracked concrete.

Use of a fixing mortar system in accordance with one of paragraphs (a) to (q) for embedding anchoring means in mortar in holes or crevices, especially in drilled holes, such as moist drilled holes, in which the injection synthetic mortar system and an anchoring means are introduced into a hole or crevice (especially in a cracked substrate, such as cracked concrete) and the fixing mortar system is caused to cure.

Process or method for embedding anchoring elements in mortar in holes or crevices, in which a fixing mortar system in accordance with one of paragraphs (a) to (q) is used for embedding anchoring means in mortar, the fixing mortar system and an anchoring means being introduced into a hole or crevice (especially in a cracked substrate, such as cracked concrete) and the fixing mortar system being caused to cure.

An anchor rod is to be provided that makes a more uniform introduction of a load in the anchoring base possible so that a fastening close to the edge is also possible in cracked concrete and in uncleaned boreholes, and with which high load ratings can be achieved these being in a range above those of the prior art or at least in a comparable range.