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US 4,378,181 AGranted
Grouting capsule
AssigneeImperial Chemical Industries PLC
InventorsRobert L. W. Beveridge, Thomas Robertson
Life of this patent
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AssigneeImperial Chemical Industries PLC
InventorsRobert L. W. Beveridge, Thomas Robertson
Estimating the term…
A capsule of hardenable grouting adhesive material has a casing which, over a length of at least 1.0 times the diameter at a leading end of the casing, is sufficiently strong to prevent excessive distortion of the capsule when the capsule is projected into a drillhole at a velocity of 12 meters per second, and has at least one radially expansible portion extending over a length of at least 0.6 times the casing diameter which is expanded radially into engagement with the drillhole wall when the capsule is projected into the drillhole. The preferred capsule casing comprises a continuous tube of flexible material e.g. plastics material, partially reinforced by an adhered external layer of reinforcing material e.g. paper or plastics sheet. The invention facilitates loading of capsules into drillholes in mine roofs by projection from a remotely controlled pneumatic loading machine and prevents the loaded capsules falling out of the drillholes.
A grouting capsule containing hardenable grouting material within an elongate frangible casing which casing, over a length of at least 1.0 times the diameter of the casing at a leading end of the casing, consists of a material of sufficient strength such that, when the capsule is projected with the said leading end forward through a projection tube into a drillhole at a velocity of 12 meters per second, distortion or damage of the capsule which could impede the said projection is prevented, said casing also having at least one flexible radially expansible portion extending over a length of at least 0.6 times the diameter of the casing, which flexible portion is expanded radially into engagement with the drillhole wall on impact of the capsule with the blind end of the drillhole when the capsule is projected into a drillhole at a velocity in the range from 7 to 12 meters per second.
A method of preparing a capsule of hardenable grouting material which comprises applying to a portion of the outer surface of a frangible flexible tubular casing containing hardenable grouting material at least one layer of reinforcing material extending over a length of at least 1.0 times the diameter of the casing, at least at one end of the casing, said reinforcing material being of sufficient strength such that, when the capsule is projected through a projection tube into a drillhole at a velocity of 12 meters per second with the said one end forward, distortion or damage of the capsule which could impede the said projection is prevented, and leaving without reinforcement a portion of the flexible tubular casing extending over a length of at least 0.6 times the diameter of the casing, whereby when the capsule is projected into a drillhole at a velocity in the range from 7 to 12 meters per second the non-reinforced portion of the flexible casing is expanded radially into engagement with the drillhole wall on impact of the capsule with the blind end of the drillhole.
Dependencies are inferred from the claim text.