Slide 29 of 45
- Drilled-in anchors
- Two types: mechanical and adhesive.
- This figure shows a mechanical anchor
- Mechanical wedge anchors are easier to install but require generally greater concrete strength due to the concentration of stresses at the expansion clip.
- The anchor works by expansion in the tip, and thus localizes all the pressure in a small area.
- This can cause the concrete to crack or, if the concrete is weak, the anchor may not tighten
- If the concrete is going to crack, it will crack when the anchor is installed
- This anchor can only be used in concrete, not in masonry