Pinning Masonry Arches – Grouted Ties
Old brick or stone arched structures that have cracking or sagging caused by separation of arch layers or movement of the key-stones can easily be repaired using heavy duty, high-tensile, stainless steel, helical ties.
Bore holes of typically 14mm to 18mm in diameter, are drilled through the masonry and filled with thixotropic, cementitious, no-slump grout. A helical tie bar is then twisted fully into the unset grout. The combination of the displacement of the grout and the deep, continuous trough of the helix locks the bar in place.
*Thor Helical 12mm Grout-Free Ties can also be used in situations where cementitious grouts cause material compatibility issues.