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Push the second bar into the grout, reaching around 50% of slot depth; this should always be at least 10mm from the first bar. Once again, trowel any excess grout to ensure full encapsulation of the rod. The bars are completely versatile and can be cut to any length and bent into any shape. Fitted with either polyester resin or cementitious grout, both techniques will help increase the tensile and flexural structure of the masonry wall. Easi-Fix Helical Drive Ties
How to Use Helical Bars for Lintel Repairs - Twistfix
In this article, we're sharing read on for more information on the several types of helical bars available and their different purposes. Below are the most common helical bars used for construction and structural repair purposes. What are Helical Spiral Bars? We have broken down the installation into simple easy to follow steps. The installation method outlined below applies to both window and door lintels. It is strongly recommended that you install helical bars at two levels above the failed lintel. Helical bars are extremely versatile - they can be cut to any length and bent to form the required shape. We recommend fitting them with Easi-Fix 2C cementitious grout or the PermaCEM Anchor Grout. Helical bars are a proven way of increasing the tensile and flexural structure of masonry walls. Helical bars have great axial strength when grouted into walls. They are able to spread loads and accommodate natural and cyclical movements within a building whilst holding the components firmly together.The reinforcing bars are generally concealed within mortar beds to disguise installation.Push a first helical bar into each grouted aperture, to about 75% of the slot’s depth. To ensure the rod is appropriately encapsulated, use a trowel or pointing iron to compress any displaced grout. A particular advantage of helical stitching kits is their ease of application. Helical bars can be inserted into existing masonry with minimal effort or disturbance, providing excellent strength while leaving no visible mark on the wall’s exterior. Our UKCA and CE Mark bars comply with BS EN 845:1 for strengthening masonry. The reinforcement resists tension loads of at least 8 kN.
Use Helical Bars for Lintel Repair - Knowledge Hub How to Use Helical Bars for Lintel Repair - Knowledge Hub
Twistfix helical bars are bonded into slots that have been cut at pre-determined levels within the masonry. In the longer lengths they are used mostly in lots of four, two rows each with a pair of bars, to form the upper and lower flanges of a deep masonry beam which will carry quite a large area of masonry above an unsupported area. It does this by redistributing the load placed on the structure to solve any problems which may have been caused due to localised structural movements. YOU SHOULD REPEAT THIS PROCESS FOR THE SECOND LEVEL. THE SECOND LEVEL IS CREATED BY CUTTING ANOTHER SLOT FOUR COURSES ABOVE THE FIRST USING EXACTLY THE SAME METHOD. The ties can be installed using a SDS-Plus shank hammer drill to drive and countersink the tie. The unique design of the helical tie means the tie can be easily driven into a 5.5mm pre-drilled pilot hole. The fins of the tie undercut the masonry when being driven into the substrate to provide an expansion-free anchorage that will withstand tension and compression loads.
Where timber lintels are used, often in older properties, you are at risk from wood rot (wet and dry) as well as wood boring beetles. This can affect the structural integrity of the timber and mean that need you to replace or repair them using helical spiral bars as outlined in this guide. Insert a further bead of HeliBondover the exposed HeliBar, finishing 12mm from face and ‘iron’ firmly into the slot using the HeliBar insertion tool Helical bars when used for lintel repairs are available in three and seven metre lengths. These longer lengths allow the bars to extend beyond the window or door by the required 500mm. You can also cut the longer lengths to the exact size required. Helifix HeliBar Remedial Helical stainless steel reinforcing bar for masonry repair and new construction The best way to do this is with an inspection to appraise if there are sufficient walls ties. With a cavity wall, you should be able to carry out a visual inspection, looking between the inner and outer leaves. If you are unable to get a good view of the existing wall ties and their frequency then you canuse a metal detectoror an endoscope camera.
Helibar Product Datasheet - Home | Helifix
HeliBar is a helical stainless steel reinforcing bar, with substantial tensile properties, used for strengthening and stabilising masonry in both new build and remedial situations. Push a helical bar into the incision about three-quarters deep. Ensure the grout encapsulates it and compress any grout that has been displaced. We recommend thixotropic WHO60 ®, which is a cement-based grout featuring added polymers.The BRE Load Tables are specific to the proprietary helical bars tested and bonded into walls with this purpose-made mortar. Shrink-compensated, the grout effortlessly bonds the bars to the masonry, setting in and around the deep troughs of the helix and delivering compressive strength combined with some flexibility, which safeguards against sudden failures when overloaded.Apply a second bead of anchor grout into the slot, making sure that the first bar is completely covered. Trowel away any excess grout before adding the second helical bar. This bar should reach around half the depth of the slot and be at least 10mm from the first bar.
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