Grout delivery system for a rock bolt

Abstract

A grout delivery device which includes a body which defines an internal volume ( 18 ), opposing first ( 34 ) and second ( 26 ) apertures in the body, in communication with the volume, through which a rock support tendon ( 50 ) extends, and a grout formation ( 44 ) on the body for connection to a grout source.

1 . A grout delivery device for use with a bearing plate and a rock support tendon which extends through an opening in the bearing plate, the device including a body which defines an internal volume, a first aperture positioned in a surface of the body which opposes an inner surface of the bearing plate, a second aperture in the body which opposes the first aperture, the rock support tendon extending through the first and second apertures which are in communication with the volume, and a grout opening in the body which is displaced from the first and second apertures and through which grout is injectable into the volume. 
     
     
         2 . A device according to  claim 1  wherein the body includes a first body, portion in which the first aperture and the grout opening are located and a second body portion in which the second aperture is located. 
     
     
         3 . A device according to  claim 2  wherein the second body portion is movable relative to the first body portion at least to a limited extent. 
     
     
         4 . A device according to  claim 3  wherein the body includes bellows-type formations which allow the second body portion to be movable relative to the first body portion. 
     
     
         5 . A device according to  claim 2 , wherein an outer surface of the first body portion surrounds the first aperture and is convex, semi-spherical or conical in shape. 
     
     
         6 . A device according to  claim 2  wherein the second body portion is substantially tubular. 
     
     
         7 . A device according to  claim 1  wherein the grout opening is formed by a spigot which projects from the body and through which is formed a passage. 
     
     
         8 . An assembly of a device according to  claim 1  and a bearing plate which includes an opening which is aligned with the first aperture in the body and a second opening which is in register with the grout opening in the body. 
     
     
         9 . An assembly according to  claim 8  which includes a rock support tendon which extends through the first and second apertures and through the opening of the bearing plate. 
     
     
         10 . An assembly according to  claim 9  which includes a seal at an interface of the device and the rock support tendon in the region of the first aperture. 
     
     
         11 . An assembly according to  claim 8  which includes an elongate tube which is engaged with the body in direct communication with the second aperture. 
     
     
         12 . An assembly according to  claim 8  wherein the bearing plate has a domed area in which the opening is located.