Post installing rebar is a post-anchoring connection technology widely used in my country's engineering circles. It uses chemical adhesive - anchor adheisve to cement and fix ribbed steel bars and long screws in the drilling holes of concrete substrates. A set of components that act as a key to achieve anchorage to the connector.

First, let's take a look at the standard anchor rebar construction process:

There are many factors that affect the effect of anchor rebar reinforcement, such as anchor adhesive performance, drilling depth, dust, construction steps and so on. Today we mainly talk about the importance of clearing holes.

Studies have shown that the colloidal bond strength is reduced by 50% in dry concrete without clear pores. The reason is that the powder will be adsorbed on the inner wall of the concrete under the load, because the bearing capacity of the anchor bolt is significantly reduced, resulting in the failure of the acceptance. The figure below shows the effect of different hole cleaning conditions on the bonding strength of the anchoring reinforcement.

Therefore, hole cleaning must be thorough, and three brushes and three blows are recommended.

specific method:

Use an anti-hair removal brush, cover with an extension rod, extend to the bottom of the hole, take out the dust and debris, and then use compressed air to blow out the floating dust in the hole, back and forth three times, and then wipe the inner wall of the hole with absorbent cotton dipped in alcohol. But it cannot be scrubbed with water, because alcohol is volatile, water is not volatile, and the pores are not easy to dry after scrubbing with water.