Method for forming anchor hole and diameter expansion device
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United States of America Patent
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-
May 26, 2020
Grant Date -
Feb 9, 2017
app pub date -
Oct 8, 2015
filing date -
Nov 20, 2014
priority date (Note) -
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status (Latency Note)
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Abstract
To provide a method for forming an anchor hole and a diameter expansion device by which a centrifugal force can be appropriately adjusted when a cutting-blade portion is moved in a radial direction by the centrifugal force to grind a diameter expansion portion. In a method for forming an anchor hole for a post-installed anchor in which a diameter expansion drill bit is inserted and rotated in a prepared-hole portion bored in a concrete fixing body and a cutting-blade portion of the diameter expansion drill bit is moved in a radial direction by a centrifugal force to grind a part of the prepared-hole portion to form a diameter expansion portion, the minimum value of the centrifugal force applied to grind the diameter expansion portion is 0.75 N and preferably 1.1 N.
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