Anchoring of multilayer wall constructions
General Building Inspection Approval Certificate No. Z-21.3-1967
RUBERSTEIN® Spiral Anchor
Anchoring of multilayer wall constructions
Reconstruction targets
Creation of a standard-complying anchoring, with respect to load carrying capacity and durability as well as quantity and arrangement, between the individual masonry layers
Reconstruction procedures
Installation of Ruberstein® Spiral Anchors into the existing masonry in vertical direction to the wall level for a subsequent connection of facing layer and the load-bearing layer
3 variants (depending an wall material)
Wet/wet procedureDry/wet procedureDry procedure with/without pre-drillingAdvantages of the Ruberstein® Spiral Anchor System
- Simple processing, no heavy machinery necessary; cost-effective
- Little invasion into the building structure; trouble-free application even on sensitive surfaces
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Load carrying investigations easily possible on site
Construction rules
according to DIN 1053-1 and DIN 18515-2
Dimension of insertion into the outer ≥ ⅔ of wall thickness |
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Dimension of insertion into the load-bearing layer ≥ 50 mm |
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Vertical distance between anchors ≤ 500 mm |
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Horizontal distance between anchors ≤ 750 mm |
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At least 5 anchors per m² of wall surface |
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On free borders additionally at least 3 anchors per |
Material and accessories
Ruberstein® Spiral Anchors, type SS (two tips)
or Type Standard (without tip) - for wet/wet procedure)
Ruberstein® Anchor grout (for wet procedure)
Commercially available hammer drill with SDS shank
Mortar gun with filling tube (for wet procedure)
Setting tools (for dry procedure)
Extraction measuring device
Wet/wet procedure
Similar to needling
Very appropriate for multilayer wall constructions without air layer
For walls with air layer, use of perforated sleeves or drill grouting in two steps:
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Make a bore into facing layer and load bearing layer
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Blow out the bore, moisten with water, cut spiral anchor to length, prepare anchor grout
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Press the anchor grout into the load-bearing layer bore
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Turn in the spiral anchor straight into the fresh grout
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Press anchor grout into the bore and the spiral anchor of the facing layer
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Close the wall surface with anchor grout, joint mortar or stone restoration mortar
Dry/wet procedure
Core drilling in the facing/visible layer, if necessary pre-drilling in the load-bearing layer
Particularly appropriate for two-layer wall constructions with air layer and relatively soft, homogeneous structure of the load-bearing layer
Also appropriate for rear anchors in wooden constructions
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Bore in facing layer, if necessary pre-drill in load-bearing layer
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Blow out the bore/s
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Insert the spiral anchors with appropriate setting tool in dry condition into the brick backing
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Prepare anchor grout
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Press anchor grout into the bore and spiral anchor of the facing layer
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Close the wall surface with anchor grout, joint mortar or stone restoration mortar
Dry procedure
Dry installation of spiral anchors over the entire wall section, if necessary pre-drilling depending on wall material
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If necessary, pre-drill the masonry and blow out the bore
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Insert the spiral anchors with appropriate setting tool in dry condition into the masonry
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Close the wall surface with joint mortar or stone restoration mortar