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Curtain injection
Sealing by gelation, e. g. curtain or surface injection, is a highly effective alternative for the subsequent sealing of engineering and traffic structures as well as for buildings in building and residential construction. A prerequisite for successful subsequent sealing is knowledge of the cause of the moisture damage that has occurred.
Application aim
- Sealing of structures in contact with the ground or inundated with the ground
from the inside out
- Subsequent sealing of element walls
- Filling of cavities and cracks (special proof of suitability required)
- Subsequent sealing of leaking expansion joints
- Subsequent injection of expansion joints between joint tape and
water-resistant component surface
Filling material
Demands on the injection packers
- Safe retention in the structural element during the injection at pressures depending on the injection method
- Corrosion resistance of elements remaining in the structural element
- Shut off option
- Cross section adjusted to the required delivery and flow properties of the injection material
- Check valves for low opening pressure
Demands on injection devices
- Forced delivery of the components at reliably adjustable mixing ratios
- Powerful mixing head with check valves and cut off cocks
- Mixing line suitable for the injection material
- Separate high-pressure rinsing pump
- Monitoring and documentation of injection and dosing processes - DESOI w.i.l.m.a., (please request consultation and brochure!)
Suitable objects
- Houses and industrial structures
- Civil engineering structures
- Civil and canal construction
- Water engineering
- Tunnelling
Types of packers
- Bore packers (steel)
- Drive-in packers (polymer)
Fields of application
- The untight building component is drilled through from the inside to the outside
- The low-viscosity, liquid injection material displaces the existing water and forms an elastic sealing layer and / or an elastic injection body, together with the surrounding building ground
Information on the injection methods
- Injections into the building ground are subject to compulsory notification according to art. § 49 of the Water Resources Act (German abbreviation WHG)
- Prior to starting any gel injection work, a corresponding notification should be submitted to the competent Lower Water Authority and the Agency for Environmental Protection
- Construction chemical products should be accompanied by a suitability certificate according to the principles of the evaluation by the German Institute for Building Technology (German abbreviation DIBt)
- An expert engineer (competent planner) should be appointed with the planning
Injection of expansion joints
- Leaky expansion joints are usually sealed by partial curtain injection
- Leaky construction joints are treated like cracks with regard to injections
Support measures
- Provision of technical advice and recommendations with regard to competent planners and specialists for the execution of the work involved
- DESOI recommendation; technical specifications
- DESOI ABC of injection: The reference work for construction experts
- DESOI technical brochure: Sealing with injection methods
- WTA information sheet; gel injection 5 – 20
- STUVA ABI information sheet (edition 2014)
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