Thor Helical - Grout Ties

Grouted helical tie for stabilising failed solid masonry.

Grout-Ties-image 265px
Description:

Grout ties are fixed into masonry walls with a high strength cement based grout.  The high fin profile of the helix provides an excellent key between the stainless steel reinforcing tie and polymer modified grout.

The strength and integrity of separating masonry layers can be restored using the ties that are fully grouted into deeply drilled boreholes using thixotropic, cementitious grout.

 

Grout ties are used to reinforce thick or rubble filled walls, reconnect external walls with internal partitions, stabilise parapets and pin masonry arch layers in buildings, bridges and tunnels.

To install the ties 14-18mm diameter clearance holes are drilled into the masonry to a depth that is at least 25mm longer than the tie. Holes are thoroughly washed out with clean water. WHO-60 polymer modified grout is pumped to each hole, filling the bore and any voids.  Stainless steel helical tie bars are wound 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.

Benefits:
  • Ties securely bonded to masonry through displacement of grout
  • Non-disruptive, quick and easy to install
  • Allows for normal structural movement
  • Highly effective, fully concealed, masonry stabilisation technique
More Information:

Thor Helical grout ties are available in AISI304 grade Austenitic Stainless Steel.  The ties are supplied in the following standard sizes

  • Lengths: 0.5m, 0.75m and 1.0m
  • Diameter: 8mm and 9mm
Product Specifications

MECHANICAL PROPERTIES OF 8mm GROUT TIES

CSA
12.9mm2
0.2% Proof Stress
>715N/mm2
Ultimate Tensile Strength*
1050-1190N/mm2
Mean Tensile Capacity**
14.44kN

* Ultimate Tensile Strength is measured within a calibrated tolerance of +/- 2%
** Mean Tensile Capacity derived from CSA x Mean UTS

MECHANICAL PROPERTIES OF 9mm GROUT TIES

CSA
15.6mm2
0.2% Proof Stress
>775N/mm2
Ultimate Tensile Strength*
1050-1190N/mm2
Mean Tensile Capacity**
17.47kN

* Ultimate Tensile Strength is measured within a calibrated tolerance of +/- 2%
** Mean Tensile Capacity derived from CSA x Mean UTS

TYPICAL PERFORMANCE LOADS (taken from CE Mark Testing)

BS EN 845-1:2013 National Annex NA states that the bars need to provide an equivalent performance to the prescriptive 30mm x 5mm lateral restraint straps and the tension straps should have a declared tensile load capacity of at least 8kN

8mm Diameter Tie
11.06kN
9mm Diameter Tie
11.50kN

Load with 400mm tie-length bonded to brickwork with WHO-60 grout

Downloads