Modified stone column drill

摘要

A granular stone column drill which includes a first drill, a second drill and a displacement device, where—the first drill includes a tube within which the second drill at least partially, co-axially, lies; —the second drill includes a drill flight and first terminal end; —the displacement device includes a displacement unit and at least one guidance means; —the displacement unit includes a guide channel and an exposed wall such that the guide channel extends into the exposed wall; —the exposed wall lies approximately parallel to a centerline of the second drill; and—the at least one guidance means are located within the guide channel; such that the guide channel is a continuous circumferential channel that follows a wave like path, and either the at least one guidance means or the displacement unit is releasably or permanently attached to the second drill.

主权项

1. A granular stone column drill which includes a first drill, a second drill and a displacement device, where
the first drill includes a tube within which the second drill at least partially, co-axially, lies; the second drill includes a drill flight and first terminal end; the displacement device includes a displacement unit and at least one guidance means; the displacement unit includes a guide channel and an exposed wall such that the guide channel extends into the exposed wall; the exposed wall lies approximately parallel to a centreline of the second drill; and the at least one guidance means are located within the guide channel; such that the guide channel is a continuous circumferential channel that follows a wave like path, and either the at least one guidance means or the displacement unit is releasably or permanently attached to the second drill.