Injection liner for a borehole closure

Injection line for use as a borehole closure in masonry or rock including a nipple having a first axially extending threaded part and an axially extending second part extending from said first part for connecting said liner to a source of material to be injected into the borehole, said liner comprises an axially elongated unitary tubular shaft forming an axially extending bore therethrough, said shaft having a leading end arranged to be inserted first into the borehole and a trailing end arranged to be located adjacent to and outwardly from the opening into the borehole, said shaft is frusto-conically shaped and tapers inwardly from the trailing end to the leading end of said shaft so that said shaft can be placed into and then secured tightly in place within the borehole with the trailing end projecting from the borehole, said shaft is formed of an impact resistant plastics material, said first threaded part of said nipple is threaded into engagement within the trailing end of the bore through said shaft, whereby a material can be pressure injected through said nipple and liner into the borehole and after the completion of the material injection a sidewards hammer blow to the part of said liner protruding outwardly from the borehole can break off the protruding portion at a location slightly inwardly of the opening to the borehole.