Lining of bore holes
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United States of America Patent
Stats
-
Dec 19, 1989
Grant Date -
N/A
app pub date -
Nov 25, 1987
filing date -
Dec 3, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The invention relates to the lining of bore holes with cement or the like by apparatus designed to spray cement directly on to the raw face of the hole. Such apparatus in accordance with the invention comprises a spray head, means to drive the head through the hole and means for delivering cement to the head characterized in that the head has an annular chamber into which cement is fed and from which colloidal cement is fed in an annular ring to a rotatable spray disc or arm which is arranged to distribute the cement substantially evenly over the internal surface of the hole. The annular feed enables even spray to take place while avoiding problems associated with axle feeding.
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