Clean borehole


Cleaning the borehole when installing dowels - is it really necessary?

All tips at a glance

Who hasn't experienced it - no matter where you look, everyone is stressed. In everyday life, or at work on the building site. Our work is usually characterized by time pressure and every minute counts. So you can confidently dispense with borehole cleaning and get straight on with it - can't you? 

No! It is essential to clean the borehole. Only if an anchor has been installed professionally and in accordance with the installation instructions can it fully perform its task. In addition, the necessary installation steps for the respective substrate and area of application must be observed to ensure that the fixing is actually permissible. The maximum pull-out values are only guaranteed if the borehole has been cleaned in accordance with the specifications. Depending on the anchor system, one to three steps are necessary here:

  • Blow out drilling dust
  • Clean the borehole with a special brush (necessary for bonded dowels)
  • Blow out the drilling dust again

Important: Cleaning with a vacuum cleaner is not enough, as it cannot clean to the bottom of the drill hole. The correct procedure can be found on the installation instructions. Specially developed tools are used for the individual steps. These include, for example, a blow-out pump and a borehole cleaning brush. We have listed all the steps for you: 

  • Drill hole
  • Blow out drilling dust
  • Clean the borehole with the cleaning brush
  • Blow out the drilling dust again
  • Insert strainer sleeve (depending on the masonry)
  • Injecting synthetic resin mortar
  • Screw in and align the threaded rod
  • Let harden according to specifications
  • Tighten nut and install component

Dowel overview