HILTI TZ2 INSTALLATION SEQUENCE WHEN WE HAVE GROUT

Hi Sonia,

For installation of the KBTZ2 in a grouted standoff condition, the installer should put metal shims under the fixture plate to prevent the fixture from moving when the torque is applied to the anchor as the plate needs to be rigid so that the anchor can be installed correctly. Grouting should be applied in the end.

It's important to note that the installer should NOT put levelling nuts under the fixture because it would prohibit an expansion anchor from pulling up into the wedge (it would just clamp the fixture plate to the levelling nut).

Without the clamping forces and correct installation of the KB-TZ2, the anchor is not properly set and may not perform as designed. When the anchor is properly set, the mandrel of the anchor is properly engaged with the wedges that are engaged with the base material.

Finally, we recommend referring to the KB-TZ2 Operating Instructions, which provide detailed installation guidance and best practices.

I hope this helps!

In general, Hilti does not recommend removing the nut and washer from a properly installed KB-TZ2 anchor, nor reinstalling an anchor by driving it deeper after it has already been torqued. To achieve the published performance and load capacities, the anchor should remain installed in accordance with the approved installation instructions and at the specified installation torque.

With respect to re-torquing KB-TZ2 anchors, please refer to the guidance provided below:

When considering retorquing of anchors, the retorquing procedure and guidelines below should be followed. Please note that the presence of corrosion, lubricants, and physical damage may adversely affect the amount of pretensioning in the anchor. Corrosion or physical damage may reduce pretensioning when the applied torque must compensate for higher frictional resistance. Lubricants may increase pretensioning when the applied torque must compensate for reduced frictional resistance.

Please reference the following recommended retorquing procedure and guidelines below:

1. Use a calibrated torque wrench.
2. Relieve the pretensioning by loosening the anchor or nut.
3. Inspect the anchor, nut, and fixture (i.e. base plate) as explained above.
4. Retorque the anchor to the required tightening torque published in the Instruction for Use (IFU) included with the product packaging.
5. To help limit the effect of relaxation, the anchor may be retorqued a maximum of three times following this procedure.

Care should be taken such that the nut does not bottom out at the bottom of the threads on the bolt.

Note: Since a portion of the tightening torque on a KWIK Bolt is required for setting the anchor, retorquing will pull the mandrel further up into the expansion sleeve and “reset” the anchor. Retorquing should be limited to three times to reduce the likelihood of failure from pulling the mandrel through the sleeve.

Please refer to this article for more information.

I hope this helps!