Masonry Tunnel Construction

Similar to standard masonry structures, masonry tunnels built with natural stone or brick can also be injected. Boreholes are drilled in a grid horizontally and vertically with every second-row offset and the KÖSTER Superpackers are inserted into the drill holes. In most cases, it is necessary to install an injection barrier, for example with KÖSTER Injection Barrier, in order to prevent the loss of injection material due to uncontrolled outflow.

KÖSTER Injection Gel G4 is injected in multiple phases until a pressure resistance is achieved. Afterwards, the packer holes are filled with KÖSTER KB-Fix 5. The goal is to waterproof the water bearing areas in the building element in order to later apply negative side waterproofing. For a decorative and functional surface design, KÖSTER Restoration Plasters can be applied over the KÖSTER Injection Barrier.

Hollow spaces behind masonry components require special attention. Here air-filled joints as well as large voids which are more or less filled with water-saturated material (such as earth, sand, gravel, or rubble) can be found. In many cases, it is important to ensure that no structural bonding with the surrounding rock layers takes place. The KÖSTER Injection Gel G4 can also be used to fill voids and create an elastic waterproof body. In the case that too much material is lost through openings or large gaps behind the wall, the faster reaction of KÖSTER Injection Gel S4 may be preferred.



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