Fastening in masonry - a special challenge
Masonry is the most common building material for walls in residential buildings in Germany. Bricks make it possible to construct structures flexibly on site with simple options. They ensure that the building is sealed against all climatic influences, noise, dirt, etc.
This is where perforated bricks are used very often. Regardless of whether it is perforated bricks, perforated sand-lime bricks, perforated lightweight concrete bricks or special perforated bricks filled with thermal insulation. All of these stones are usually optimized with regard to thermal insulation properties. Unfortunately, this optimization also means that the substrate is only moderately suitable for attaching high loads. Fastening systems such as bolt anchors or other metal dowels are not required due to the high expansion forces that could destroy the brick during assembly. In the area of heavy-duty fastening, only an injection system can be considered. A perforated sleeve is inserted into the borehole after the borehole has been made. This perforated sleeve then serves as a carrier material for the injection mortar. The mortar can escape through the holes in the perforated sleeve, but will not drip off due to its viscosity. Thus, after the mortar has hardened, a very stable mortar plug can form.
Anchoring in solid bricks (bricks, sand-lime bricks, aerated concrete, Ytong ...) are significantly less problematic. Here, too, an injection system is recommended. However, this can be used in solid bricks without a perforated sleeve. Since the system in this case transfers the loads to the connection between the threaded rod - mortar - stone, special attention must be paid to the prescribed drill hole cleaning. This is essential for achieving the required load capacity.
In general, the following applies to all types of heavy-duty fastening:
If the fastening is a safety-relevant fastening, ie life and limb are at risk in the event of failure or high economic damage is to be expected, this should only be carried out by trained specialist personnel.
