Injection grouting is usually carried out from the surface and is the common method for filling cracks, open joints. Grouting can strengthen a structure and can prevent a water movement. When the ports are drilled after sealing the openings and the grout pressure is up to 350k Pa a hand held, cone shaped fitting on the grout hose connections. For large grout pressures short pipe nipples are connected in to the holes to obtain grout hose connections.

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