Grout Ties

Grout Ties are helical bars that bond into masonry with WHO-60 polymer-modified grout. The system’s function is crack stitching with medium-duty tension ties in boreholes rather than slots cut in bed joints. The fully grouted tie-bars restore the strength of separating masonry layers. Grout ties can reconnect external walls with internal partitions, stabilise parapets and pin masonry arch layers in buildings, bridges and tunnels.

The tie installs via 18mm diameter clearance holes in the masonry; the 240mm² bore diameter is a depth that is at least 25mm longer than the tie. After flushing the holes with clean water and pumping them full of WHO-60 polymer-modified grout, the stainless steel helical tie bars can wind into the unset grout, displacing it tightly into voids. Once set, the high strength grout interlocks with the peaks and troughs of the helix to bond the grout ties to the masonry.

Thor Helical do not recommend installation procedures that involve inserting the tie into the pinning nozzle and grout expelling the tie/grout composite in a single operation. This technique is flawed and may lead to inadequate bonding to the masonry.

Products required for the installation of grout-bonded ties are:

• WHO 60 polymer-modified grout (yield=3l); 1 tub for 10 ties
• Mortar gun, pipe, cone and brick pinning nozzle set
• Mixer paddle

Grout ties are supplied loose, ready for resale packaging, on pallets containing 480 ties.