Repair of cracks - horizontal bed joint repairs
Reconstruction targets
Obstruction of the movement of existing cracks and prevention of the formation of new cracks at other positions in the masonry –
i. e. masonry reinforcement for a damage-free deflection of future loads
Reconstruction procedures
Embedding of Ruberstein® Spiral Anchors using Ruberstein® Anchor Grout in previously opened joints or slits of the existing masonry in horizontal direction to the wall level
Advantages of the Ruberstein® Spiral Anchor System
- Flexible crack bridging without load concentrations and thus long-lasting joining of cracks with high safety against new crack formation in spite of still existing component deformation
- Simple processing, no heavy machinery necessary
- Little invasion into the building structure
Construction rules
- Laying direction preferably horizontal, or vertical to the course of the crack
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Anchor diameter preferably Ø 8 mm or Ø 10 mm
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Anchor length / distance from course of the crack ≥ 40 cm on both sides, additionally lateral offset of approx. 20 cm in case of several vertically consecutive anchor positions, overall length min. 100 cm
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Number of anchors according to measuring, or vertical distance of the anchor positions ≤ 35 cm constructively
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Please observe anomalies in border areas, near wall openings as well as in corner formations and arches (if necessary ask for sketches with detailed solutions)
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If possible, bridge crack groups with common, longer spiral anchors
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Overlap joints ≥ 50 cm
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Anchor grout with spiral anchor
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Slit height (h) usually 10...20 mm (or height of the horizontal joint)
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Slit depth (t) usually 40...50 mm (observe static stability)
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effective joint circumference (t + 0.5 h) ≥ 50 mm
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Laying depth of the spiral anchors in the wall section ≥ 20 mm (without plaster layer)
Material and accessories
Ruberstein® Spiral Anchors, type Standard (without tip)
Ruberstein® Anchor grout
Commercially available wall chaser/slitter or angle grinder
Mortar gun (with standard jet)
Video repair of cracks
Processing
- Cut the joint e. g. with wall chaser
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Blow out the joint, moisten with water
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Apply first layer of anchor grout with mortar gun into the joint
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Cut spiral anchor to length, press into anchor grout
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Apply second layer of anchor grout into the joint
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Close the remaining joint with anchor grout or coloured joint mortar
Joint / slit depth tF | ||||||
---|---|---|---|---|---|---|
25 mm | 30 mm | 40 mm | 50 mm | 60 mm | 70 mm | |
Consumption per m | 0,30 l | 0,37 l | 0,49 l | 0,62 l | 0,75l | 0,87l |
Yield per bucket (6 l) | ≈ 20 m | ≈ 16 m | ≈ 12 m | ≈ 10 m | ≈ 8 m | ≈ 7 m |
Calculated consumption / yield of the Rubersteinâ Anchor Grout (joint/slit height hF = 12 mm, anchor volume neglected)
Crack reconstruction accompanying applications
Stabilisation of building corners/building sections
Replacement of ring anchors/circular beams; utilization of barrel effect (e. g. chimney reconstruction)
Subsequent masonry reinforcement / formation of reinforced lintels