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US 2004/0104049 A1Published application
Apparatus and method for forming a support column in soil
OwnerRobert Federighi, James Johnsoninventors
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Abstract
The present invention provides a method of forming a support column in soil using a reverse circulation down-the-hole hammer apparatus. The method includes drilling a hole with a reverse circulation down-the-hole hammer apparatus having a drill string with a return outlet and a down-the-hole hammer, and forming a column of mortar-like substance by pumping a mortar-like substance down the return outlet while lifting the apparatus out of the hole.
Claims21
A method for forming a support column in soil comprising:
- drilling a hole with a reverse circulation down-the-hole hammer apparatus having a down-the-hole hammer connected to a drill string with a return outlet;
- and
- forming a column of mortar-like substance by pumping a mortar-like substance down the return outlet while lifting the apparatus out of the hole.
An apparatus for drilling a hole in soil and forming a support column, the apparatus comprising,
- a down-the-hole hammer having a back end and a drill bit end;
- a drill string having an inner passageway, one end of the drill string connected to the back end of the down-the-hole hammer and the other end of the drill string connected to a cuttings discharge swivel;
- and
- a mortar-like substance intake valve attached to the cuttings discharge swivel.
1 more element
Dependencies are inferred from the claim text.