Masonry Magazine October 2004 Page. 33
Profiled Holes
Profiled holes can be used with a variety of non-traditional anchors to give much better performance.
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In operation, a standard straight hole is drilled to a depth appropriate to the task and material, for instance a half-inch hole drilled four inches into a concrete panel. The Profiler bit is mandrel-shaped to create the desired profile and a diamond-banded "drilling tube" that does the actual profile coring. The mandrel is inserted into the hole so the tip, with a small washer and nut set, is bottomed. Then the core sleeve is placed over the mandrel shaft and turned by the drill. As the sleeve descends the length of the mandrel, the profile of the mandrel causes the diamond segments to expand, forcing the cutting material outward against the wall of the material, grinding the profile. The core tube accommodates the mandrel and keeps it centered while the expanding diamond "blades" work outward to expand the hole into the desired profile.
When used with a multi-part profile, such as those with repeated bulges along the length, the camming action of the mandrel forces the cutting blades out and retracts them when appropriate.
The Cintec anchoring system has various cementious material anchors, including one that causes bulges of mortar at each point in the profiled hole where a cavity has been created. This product was developed in the United Kingdom and used in the post-fire restoration of Windsor Castle.
A steel rod wrapped in a fabric "sock" is inserted into a predrilled hole in the masonry. Once in place, extra-fine grout is pumped into the end. As the anchor fills, the milk grout is forced through the mesh, creating a chemical bond between the anchor and the substrate.
"One of the best things about this system is that the material is cementious, not epoxy-based," explains architect Michael Zemsky. "The most interesting part is that the nylon sock expands to fill the cavity until it is completely wedged in."
Zemsky specified Cintec anchors on the Essex County New Courts Building and Jail in Newark. The 1966 building's limestone curtain wall panels had separated from the structure, causing damage so pervasive and severe that the building was, in Zemsky's words, "one accident away from catastrophic failure."
Using this expanding mortar-filled anchor creates a dual connection: it expands into the cavity formed by the profiling drill, and the seeping mortar bonds chemically with the substrate.
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CIRCLE 163 ON READER SERVICE CARD October 2004 Masonry 31