High-pressure packing device for injecting synthetic resin into cracks in concrete

Claim 1

A high-pressure packing device for injecting hardenable synthetic resin into cracks in concrete and insertable into a hole drilled in concrete in the region of a crack, comprising an elongated sleeve of synthetic plastic material having an axis and an internal bore, a front end to be positioned near a base of said hole and a rear end, said sleeve having an outer surface tapering towards said front end whereby said sleeve is wedged in said hole; and an injection nipple inserted into said bore at said rear end of the sleeve, said sleeve being formed with a plurality of longitudinal guiding grooves formed in said outer surface and starting immediately from said front end and extended in the direction of the axis of said sleeve, said guiding grooves being spaced from each other in a circumferential direction, said sleeve being further formed with at least one additional circumferential groove formed in said outer surface and extended between two said adjacent grooves to connect the longitudinal grooves to each other, whereby the synthetic resin injected through said niple into said bore flows into said base and then is guided along said longitudinal and circumferential grooves and rises towards the crack to seal the crack when hardened.