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US 6,672,806 B2Granted
Device for drilling and anchoring and process for placing grout anchors
AssigneeForasol International SA
InventorVincenzo Sibilla
Life of this patent
Estimating the term…
Abstract
A drilling and anchoring device comprises a drilling pipe (8), a drilling tool (12) mounted at the end of the pipe, and one or several cables (4) and/or other anchoring reinforcements. The cables and/or other anchoring reinforcements are so attached to the drilling tool that the drilling tool remains in a grout body (7) formed by cement injection in the ground surrounding a drilling hole (6).
Claims5
A process for forming grout anchors comprising the steps of:
- drilling a hole in the ground by means of a device comprising a drilling pipe equipped at its front end with an injection tool coupled in an axially separable manner to a drilling tool attached to one or several anchor cables or other anchoring reinforcements, said pipe having a cement injection channel and said injection tool comprising at least two injection nozzles directed radially outwards and at least one injection nozzle directed inwardly towards the anchor cables or other anchoring reinforcements;
- and
- withdrawing and rotating the pipe while simultaneously injecting said cement slurry through said at least two injection nozzles directed radially outwards into the surrounding ground and through said at least one injection nozzle directed inwardly around the anchoring reinforcements and drilling tool to form an anchor bulb without mechanical reaming.
Dependencies are inferred from the claim text.