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Mineral material
In case of crack repair with cement suspension and cement paste, cracked structural elements are repaired by means of non-positive injection. The cracks are injected so that no more water can penetrate after the injection process is completed. The injection material forms a protection against the penetration of aggressive substances and prevents corrosion of the reinforcement. The load-bearing capacity of the structural elements is restored by the frictional connection of the crack flanks.
Aims of application
- Sealing and filling of cracks, hollows and voids
- Creation of frictional connection of cracked building components
- Creation of a connection guaranteeing tensile and compression strength
- Masonry consolidation and stabilisation
Filling material
- Injection mortar
- Cement paste
- Cement suspension
Demands on injection packer
- The material of the packers (parts of packer) must be appropriate for the used injection material
- Safe retention in the structural element during the injection at pressures depending on the injection method
- Corrosion resistance of the parts remaining in the building
- Possibility of shutting off
- Cross section adjusted to flow properties of injection material
- No reduction of cross section in the packer and connection system
Suitable objects
- Residential buildings, industrial structures
- Buildings of masonry and concrete
- Natural stone buildings
- Historic and listed buildings
- Civil engineering and water engineering
- Canal-, harbour-, and river engineering
Advantages
- Injection with low- and high pressure method
» The special material caracteristics of the adhesive packer support the adhesive bond between the adhesive and adhesive surface of the packer.
The adhesive packers resist to high injection pressures depending on the adhesion with the soil.
- Saving of time and material
» With the Klebfix (approx. 6 g) the adhesive is applied on the adhesive surface of the packer
» The sealing material is spread on the crack surface
Application range
- On non-wet surfaces
- Structural elements with dense reinforcement
- Pre-stressed concrete
- For a width of crack from approx. 0.2 mm with filling material cement
suspension
Placing of the adhesive packers
- Roughen the surface on both sides of the crack depending on structural element, remove any debris or loose particles, dust etc.
- Distance between packers depends on thickness of structural element (normally: thickness of structural element = distance between packers)
- Keep the injection channel free by driving a greased steel pin into the crack
- Seal the crack with sealing material, but stop at the end of crack for deseration and control of filling level
- Remove all steel pins and screw a locking tappet on the the packer, open it and start injection
- Inject from bottom to top
- Close locking tappet when air and filling material is coming out of the adjacend packer
- Continue injection with the next packer
- Re-inject each packer within the pot life of the packer
- Once the injection material is hardened remove the packer and sealing material
- Recondition surface
Information
- A test injection on the object is recommended before application
- Pre-wet the crack or void before starting injection with mineral filling material
general
The self-injecting device is used when the injection process has to be carried out at low pressure (approx. 1 bar) and over a longer time period to ensure a successful result (e. g. with very fi ne cracks).
Material to be used
- Cement suspension
- Epoxy resin
- Polyurethane
Advantages
- Injection without machines
- Simple working principle
- Easy visual monitoring of consumption
- Several injection devices can be used at the same time at various places
- Can be used overhead
General operation
- Hook the tension springs to the packer
- Draw in injection material using the material cylinder
- Insert material cylinder into the cone
- Place the pressing unit on the piston
- The injection process starts, the material consumption is indicated at the scale
- Repeat fi lling process if necessary
ADHESIVE PACKER
- Mark the distance between packers
- Grease a steel pin and drive it into the crack
- Bonding with Klebfix
- Apply adhesive (sealing material) on the adhesive surface of the packer
- Place packer
- Seal crack surface up to 3 – 5 cm from the end of crack
- Bonding with hot glue
- Apply adhesive (sealing material) on the adherend of the packer and slip the packer over the steel pin and press the packer on the concrete
- Seal possible open cracks between the injection devices with adhesive
- Remove steel pin from packer
MULTI TILE PACKER
- Mit dem Spezialbohrer Ø 6 mm in die Fugenkreuze der hohlliegenden Fliesen bohren
- Remove drill dust
- Only for mineral material: pre-wet drill hole
- Clamp multi tile packer in the drill hole
SCREED SCREW PACKER
- Make a drill hole Ø 6 mm through the hollow screed using a special drill
- Remove drill dust
- Clamp screed screw packer in the drill hole
Range of application
- Dry and humid structural elements
- For the filling of cavaties
- Low- and high pressure injection into structures
Demands on the injection packers
- Compatibility of materials (packer components) with fillers used
- Reliable fixing in the component at the process-related injection pressures
- Corrosion resistance of the parts remaining in the structure
- Possibility of shutting off
Placing of the injection packers
- Packer distance depends on component thickness
(½ component thickness = packer distance)
- Drill alternately at an angle of 45° to the crack to hit the crack in the middle of
the component (depending on the object)
- Clean (e. g. with compressed air) and prepare the boreholes, depending on the
filler set and clamp packer (in the case of dry cracks, prewet crack flanks)
- Close crack with insulating material, leave crack end free for venting and level
control, at the highest point for vertical cracks
- Inject the packer until the crack filler emerges from the next packer, reinject
each packer within the processing time of the crack filler
- After the injection the injection packers are removed or non-corrosive parts can
remain in the building (agreement with the builder required)
- Seal boreholes
Plugging
- The insulation prevents the filler from escaping during injection
- Repair of leaks with fast-reacting substances
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