Injektionsförstärkning

Injektionsförstärkning, often translated as injection strengthening or grout injection, is a construction technique used to improve the load-bearing capacity and durability of existing structures. It involves injecting a fluid material, typically a cementitious grout or a resin, into cracks, voids, or porous zones within the material being reinforced. The injected material then hardens, filling the spaces and bonding the separated components together.

This method is widely applied in the repair and strengthening of concrete structures, such as bridges, tunnels, and buildings. It can address issues like cracking due to shrinkage, thermal expansion, or structural overload. By filling these discontinuities, injection strengthening prevents further deterioration, restores structural integrity, and enhances resistance to water ingress and environmental damage.

The choice of injection material depends on the specific application and the type of structure. Cementitious grouts are common for larger voids and general crack filling due to their cost-effectiveness and compatibility with concrete. Resins, such as epoxies or polyurethanes, are often used for finer cracks or when a higher degree of bonding strength and flexibility is required. The injection process usually involves drilling holes into the structure, cleaning the void areas, and then applying pressure to force the grout or resin into the desired locations. Careful planning and execution are crucial to ensure the effectiveness of the injection and the long-term performance of the strengthened element.