Helitie Bars
The HeliTie Bar is available:
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in Grade 304 and Grade 316 stainless steel
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in 3mm, 4.5mm, 6mm, 8mm, 10mm and 12mm diameters
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in different lengths ranging from 400mm to 3M.
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It is also available in 10M lengths for Approved Installers of the HeliTie System of Reinforcement.
With such a range of availability the HeliTie Bar can be designed to meet any requirements. HeliTie Bar was originally designed to get a fixing into end grain of timber. It was then discovered that it was also excellent to get a fixing into masonry which opened up a host of applications for which it is well suited. The HeliTie Bar is a very simple but effective system of tying timber to timber, timber to masonry and masonry to masonry.
Introduction
The HeliTie Bar is a Grade 304 austenitic stainless steel reinforcing material that has many unique properties. Being rolled from a plain round wire the fins are work-hardened to a very high level whilst the core remains relatively soft. The subsequent extrusion process puts the fins into tension and the core into compression. The tensile strength of the base material is more than doubled during the manufacturing process. The deformation of the fins makes the bonding characteristics of the helical bar far superior to alternative standard reinforcing materials. Grade 316 steel is available for special requirements.
Technical
The University of Darmstadt has performed independent tests on helical bar material to ascertain its tensile loadings. A full report of this testing including the methods employed, is available on request, but a summary is given in the table below. One of the properties of the helical bar material is that it performs similar to a strong coiled spring when it is stressed within its elastic limit. All of the load calculations for the design are based within this elastic limit.
Sizes
Helical Bar Diameter (mm)
Tensile (Kn)
Cross-Sectional Area (mm²)
6
8
10
7.78
9.61
12.53
8.49
10.19
13.88
Uses
The uses for HeliTie Bar are both wide and varied and they can be utilised in new build and for many specialised refurbishment requirements.
In general terms the 6mm HeliTie Bar is used for Uses the reinforcing of existing masonry structures. The helical bar combined with a cementitious grout, HeliGrout 25, can be installed into existing masonry with very little disturbance to create beams which span over window or door openings or over soft areas of ground when footings have failed. It can also be used to create lintels. Crack stitching can be achieved by using 1M HeliTie bars.
The 8mm HeliTie Bar is used for new build masonry reinforcing. The larger fin dimensions gives a much better bond into a standard building mortar than the alternative round section wire. The increase in the tensile strength during the manufacturing process also requires less material to be used.
For heavy duty applications the 10mm HeliTie Bar is in a class of its own. Very strong in tensile and shear, when combined with the bonding capabilities makes this a truly versatile product.
Special Features
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Grade 304 or 316 austenitic stainless steel.
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Excellent bonding capabilities.
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Coiled spring properties within elastic limit.
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High stress material.
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No sudden or catastrophic failure point.
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Lengths up to 10M - less wastage.
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Less intrusive than standard repairs.