Process to seal structural joints

A process for sealing a structural joint by use of an injection hose including a substantially liquid-impermeable elongated base body enveloping a passage channel and having distributed over the length thereof a plurality of openable and closeable exit openings extending from said passage channel through said base body, said process comprising:

• injecting a hardenable injection liquid under positive pressure through said passage channel, thereby opening said exit openings, and then through the thus opened said exit openings into said joint and thereby sealing said joint;
• before the thus injected said injection liquid hardens, applying negative pressure to said passage channel to thereby withdraw from said passage channel injection liquid remaining therein, and thereby causing said exit openings to close and preventing injection liquid in said joint from entering into or returning through said exit openings;
• and then
• injecting additional injection liquid, under positive pressure greater than said positive pressure at which said injection liquid is first injected, through said passage channel, thereby again opening said exit openings, and then through the thus reopened said exit openings into said joint, thereby further sealing said joint with said additional injection liquid.