Method and apparatus for making an expanded base pier
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United States of America Patent
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May 2, 2017
Grant Date -
Oct 27, 2016
app pub date -
Jun 7, 2016
filing date -
Sep 3, 2009
priority date (Note) -
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Abstract
A system for constructing a support column includes a mandrel with an upper portion and a tamper head. A feed tube extends through the mandrel for feeding flowable material to the head. The tamper head includes a lower enlarged chamber with a reducing surface at an upper portion and includes a plurality of chain links for compacting material and restricting upward flow of aggregate. The tamper head is of a size providing an enclosed region for allowing cementitious materials to be placed therein. A non-moveable sealed top plate and a separate flowable material supply tube is included via a sealed connection. A pressure gauge for monitoring air pressure within the tube portion is included and allows a support column including a cementitious inclusion on top of an expanded base to be built with a known unitary expanded base volume calculated based on pressure drop indications.
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