Apparatus and method for making cylindrical columns
AssigneeCondon-Johnson & Associates, Inc.
InventorJames O. Johnson
Life of this patent
Estimating the term…
Abstract
A tool for use with a rotatable drill shaft and a source of pressurized fluidized solidifying agent. The tool member has upper and lower extremities. A coupler is coupled to the upper extremity of the tool member and is adapted to be secured to the drill shaft. A plurality of radially extending arms are secured to the tool member intermediate the upper and lower extremities of the tool member. A plurality of forwardly and downwardly extending teeth are secured to each of the radially extending arms and are spaced apart longitudinally of the arms. A plurality of nozzles are carried by the tool member and are spaced circumferentially of the tool member and are coupled to the source of pressurized fluidized solidifying agent.
Claims15
A tool for use with a rotatable drill stem and a pressurized source of fluidized solidifying agent comprising a tool member having upper and lower extremities, means coupled to the upper extremity of the tool member and being adapted to be secured to the drill stem, a plurality of radially extending arms secured to the tool member intermediate the upper and lower extremties of the tool member, a plurality of forwardly and downwardly extending teeth secured to each of the radially extending arms and being spaced apart longitudinally of the arms, a plurality of nozzles carried by the tool member and spaced circumferentially of the tool member, said nozzles being spaced radially outwardly from the tool member, and piping carried by the tool member adapted to connect the source of pressurized fluidized solidifying agent to the nozzles.
An apparatus for providing soil mix columns, a crane carrying a hollow drill stem having a flow passage therein, a grout pump, piping for supplying pressurized fluidized solidifying agent from the grout pump to the flow passage in the drill stem, a soil mixing tool secured to the drill stem, said soil mixing tool comprising a tool member having upper and lower extremities, a coupling connecting the upper extremity of the tool member to the drill stem, a plurality of radially extending arms secured to the tool member intermediate the upper and lower extremities, a plurality of forwardly and downwardly extending teeth secured to each of the radially extending arms and spaced apart longitudinally of the radially extending arms, a plurality of nozzles carried by the tool member and spaced apart circumferentially of the tool member, said nozzles being spaced radially outwardly from the tool member and piping coupling the nozzles to the flow passage in the drill stem for supplying pressurized fluidized solidifying agent to the nozzles.
A method for forming at least one soil mix column in soil comprising the steps of progressively mixing in a single downward pass a cylindrical volume of the soil in situ to provide a cylindrical volume of soil having a central portion and an outer margin and supplying a pressurized and fluidized solidifying agent into the cylindrical volume of soil while it is being mixed in such a manner that the fluidized solidifying agent is only delivered into the outer margin of the cylindrical volume of soil and leaving the central portion of the cylindrical volume of soil substantially free of the fluidized solidifying agent.
Dependencies are inferred from the claim text.