In general, there are not many anchor options that are valid for installation in hollow core slabs. The options are further reduced if the anchor must be approved for such an application. It’s important to remember that although hollow core slabs are made of concrete they have cavities which means the usual expansion anchors are not appropriate.
INDEX A perfect fixing has several solutions in its catalogue for this type of material, with European approvals that guarantee performance in the situation described above. We describe them here:
- Concrete screw – Code TH/TF:This anchor is screwed directly into a pre-drilled hole in the concrete. During installation, the fixing is screwed directly into the pre-drilled hole which has a diameter smaller than the diameter of the screw, so that the screw is tapping and anchoring its own thread in the concrete.Due to its function, it is not only suitable for this base material but also has European approval for “Anchors for use in concrete for redundant non-structural systems” in accordance with EAD 330747-00-0601.
- Short female anchor – Code HEHC:This anchor is inserted into the hole drilled in the concrete at the specified diameter. It is then expanded by means of a tool (EXHBM); when a cone located inside the anchor is hit it causes the anchor to be fixed in the concrete. Once installed, a screw is screwed in, which fixes the plate to the base material.Due to its short length, this anchor is ideal for this type of base material. As the anchor is so short, with some exceptions, neither the hollow part of the material nor the prestressed reinforcement will be reached.
- Hollow core slab anchor – Code HC:This anchor is inserted into the hole drilled in the concrete at the specified diameter. It is then expanded by screwing in a metric screw or a threaded rod. When the installation torque is applied to the nut, the cone expands the sleeve to fit the drilled hole.Given its operation, this is the anchor that offers the best performance in this type of material.
Latest revision: FAQ34 rev0
