Injection hose (sealing of technological joints)
Injection hoses are installed in technological/working joints of concrete edges (e.g., wall or floor joints) and elsewhere before pouring concrete structures. A variety of perforated or cut hoses are used. Once the concrete hardens, injection material is injected through such hoses in order to fill all leaks. Injection hoses are an alternative to working joint tapes, swelling tapes or joint tin-plates and can be used several times depending on the type of construction and the injection material selected.
Injection materials used with injection hoses:
- one- or two-component polyurethane or epoxy resin (simple pressure injection);
- acrylate gel or cement glue or cementitious slurry (multiple injection, washing out the previously used materials from the hose).
They are installed using a variety of anchoring techniques, e.g. mounting mesh, drive-in brackets or other methods recommended by the manufacturers. Once injection hoses are correctly installed, their ends are left free and extended through the formwork.
According to manufacturer's recommendations, hose ends are placed in special boxes, or duoboxes, in order to facilitate access to hose ends and subsequent injection after the concrete is poured. Modern injection hose boxes save a lot of time and look aesthetic, which may be relevant with exposed concrete structures.
Injection in expansion and deformation joints
Sealing of expansion and deformation joints is one of the more difficult tasks, because non-compliance can lead to long-term problems. In this case, proper installation of joints requires appropriate knowledge, understanding of materials and work experience. In principle, such joints can be successfully sealed by injection, if one is able to make injections into joints that are put together at a certain angle due to installation situations (e.g. deformation joints in subway and underground tunnels, canals, underground garages).