×

METHOD AND APPARATUS FOR CREATING RAMMED AGGREGATE PIERS USING A HOLLOW MANDREL WITH UPWARD FLOW RESTRICTORS

  • US 20080205993A1
  • Filed: 02/22/2008
  • Published: 08/28/2008
  • Est. Priority Date: 02/22/2007
  • Status: Active Grant
First Claim
Patent Images

1. A system for constructing aggregate piers, comprising:

  • a mandrel having an upper portion and a tamper head, and a passage extending therethrough for feeding aggregate through the mandrel to the tamper head; and

    said tamper head being open to provide a passage for aggregate to pass through the tamper head out of the mandrel, and having structural members connected therein for allowing free flow of aggregate therethrough when the mandrel is raised during operation, and for preventing aggregate flow back into the mandrel during downward tamping.

View all claims
  • 22 Assignments
Timeline View
Assignment View
    ×
    ×