Device and method for improving adhesive anchor performance

Abstract

A cured concrete and stone bore working tool and method of forming radially oriented discontinuities in a bore or perforation Ruined in a cured concrete or stone material such that, after use or application of the tool, the perforation formed in the cured concrete or stone material is configured to provide a non-planar adhesive interface and isolate a properly sized anchor or fastener from direct contact with the wall of the bore. Fasteners or anchors adhesively secured in bores previously treated with the bore treating tool exhibit improved creep failure performance as compared to fasteners adhesively secured to untreated bores.

What is claimed is: 
     
         1 . A cured concrete or stone working tool comprising:
 an elongate body defined by a work facing end, a tool facing end, and a radially outward directed surface between the work facing end and the tool facing end; and   at least one projection that extends in an outward radial direction from the radially outward directed surface of the elongate body proximate the work facing end, the at least one projection being constructed to remove cured concrete from a wall defined by a perforation previously formed in a cured concrete surface during introduction of the elongate body in an axial direction relative to the perforation to define a non-planar shape of the wall of the perforation upon extraction of the elongate body and prior to placement of an adhesive and an anchor relative to the perforation and such that the anchor is maintained in a spaced relationship from the wall of the perforation.   
     
     
         2 . The cured concrete or stone working tool of  claim 1  wherein the at least one projection'is further defined as a plurality of projections that are spaced relative to one another along the radially outward directed surface of the elongate body. 
     
     
         3 . The cured concrete or stone working tool of  claim 2  wherein the plurality of projections are spaced from one another in at least one of a radial direction and an axial direction relative to the elongate body. 
     
     
         4 . The cured concrete or stone working tool of  claim 3  wherein the plurality of projections are spaced from one another in each of a radial direction and an axial direction relative to the elongate body. 
     
     
         5 . The cured concrete or stone working tool of  claim 3  wherein at least one of the plurality of projections defines a continuous helical shape along a portion of the radially outward directed surface of the elongate body and another of the plurality of projections extends a dissimilar radial distance from a longitudinal axis of the elongate body than the at least one projection. 
     
     
         6 . The cured concrete or stone working tool of  claim 2  wherein each of the plurality of projections are at least one of hardened, formed of ceramic material, limited of carbide material, and diamond coated. 
     
     
         7 . The cured concrete or stone working tool of  claim 1  wherein the elongate body is hollow. 
     
     
         8 . The cured concrete or stone working tool of  claim 1  further comprising at least one groove formed in the radially outward directed surface of the elongate body between the work facing end and the tool facing end. 
     
     
         9 . The cured concrete or stone working tool of  claim 8  wherein the at least one projection is formed proximate an intersection of the at least one groove and the radially outward directed surface of the elongate body. 
     
     
         10 . A method of providing an adhesive cured concrete or stone anchor system, the method comprising:
 forming a perforation in a cured concrete or stone material;   forming at least one channel in a radially inward directed surface of the perforation formed in the cured concrete or stone material that faces the perforation and such that a majority of the at least one channel has a radius that is greater than a smallest radius associated with an exterior surface of the cured concrete or stone material about the perforation;   disposing an amount of an adhesive in the perforation; and   placing an anchor in the perforation such that the anchor is offset in a radially inward direction from the radially inward directed surface of the cured concrete or stone material along a length of the anchor that is inboard of the exterior surface of the cured concrete or stone material.   
     
     
         11 . The method of  claim 10  further comprising removing spoils associated with formation of the perforation and formation of the at least one channel prior to disposing the amount of the adhesive in the perforation. 
     
     
         12 . The method of  claim 10  wherein forming the at least one channel further comprises axially displacing a cured concrete or stone working tool during rotation of the cured concrete or stone working tool in a first rotational direction relative to the perforation in the cured concrete or stone material. 
     
     
         13 . The method of  claim 12  wherein forming the at least one channel further comprises rotating the cured concrete or stone working tool in an opposite rotational direction to allow displacement of the cured concrete or stone working tool in an opposite axial direction out of the at least one perforation. 
     
     
         14 . The method of  claim 10  wherein forming the at least one channel further comprising forming the channel that have a helical shape in the radially inward directed surface of the perforation. 
     
     
         15 . The method of  claim 14  wherein forming the at least one channel further comprises forming more than one channel that each have a helical pattern and that are radially offset from one another relative to a longitudinal axis of the perforation. 
     
     
         16 . A method of forming a cured concrete or stone bore treatment tool comprising:
 providing an elongate body having a tip disposed at one end and a drive tool engagement formed at an opposing end of the elongate body, wherein the tip is ill-suited to bore into a cured concrete or stone material and the drive tool engagement is constructed to cooperate with a drive tool configured to rotate the elongate body;   forming at least one projection on the elongate body between the tip and the drive tool engagement such that the at least one projection extends in an outward radial direction from an exterior surface of the elongate body; and   wherein the elongate body is sized to fit snuggly within a bore formed in a cured concrete or stone material and the at least one projection removes cured concrete or stone material during rotation and axial translation of the elongate body relative to the bore in an inward axial direction.   
     
     
         17 . The method of  claim 16  wherein forming the at least one projection is further defined as forming a plurality of projections that are oriented at dissimilar radial location relative to one another. 
     
     
         18 . The method of  claim 16  further comprising forming the at least one projection to extend in a helical manner about a portion of the elongate body. 
     
     
         19 . The method of  claim 16  further comprising forming at least one channel in the elongate body that extends at least a portion of a distance between the tip and the drive tool engagement. 
     
     
         20 . The method of  claim 19  further comprising forming the at least one projection proximate an intersection of the at least one channel and an exterior surface of the elongate body. 
     
     
         21 . The method of  claim 16  further comprising forming the least one projection of at least one of a hardened material, a ceramic material, a carbide material, and a diamond coat material.