Plug for blasting hole

Details Plug for blasting hole Plug for blasting hole

E - Fixed Constructions

21

B

166/63

E21B 33/12 (2006.01) E21B 33/129 (2006.01) E21B 33/134 (2006.01) F42D 1/18 (2006.01)

Patent

CA 1209033

ABSTRACT OF THE DISCLOSURE The disclosure herein describes a plug for use in a blasting hole for retaining a blasting charge in the hole and/or closing the hole, it comprises a cylindrical body and a tapered expander insertable in the central bore of the cylindrical body, the latter being provided with circumferentially spaced longitudi- nal slits extending from the top wall to a distance short of the bottom wall to define on the body a plurality of segmental sections which are forced into contact with the wall of the blasting hole when the expander is hit by a tamper device. When the plug is used for retaining a blasting charge, the slits, being widened as a result of the expansion, form water passages to discharge water from the charge retaining area of the hole.

448150

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