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US 4,395,162 AGranted
Cartridge for use in anchor bolting
AssigneeSociete Anonyme d'Explosifs et de Produits Chimiques
InventorsJohn M. Murphy, Robert H. Spensley, John Ellis
Life of this patent
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AssigneeSociete Anonyme d'Explosifs et de Produits Chimiques
InventorsJohn M. Murphy, Robert H. Spensley, John Ellis
Estimating the term…
Reinforcing or fixing elements such as anchor bolts are anchored in a borehole drilled in a substrate such as an underground mine roof with an anchoring cartridge in which a particulate liquid-settable solid component, for example a hydraulic cement, is contained in a liquid-impermeable casing, the solid occupying a volume which is less than the normal free volume of the casing and the cartridge being at least partially evacuated so as to cause the casing to be in contact with the solid component over substantially its whole length within the casing. This ensures that when the cartridge is immersed in an activating liquid, for example water, and the casing perforated, the activating liquid is drawn rapidly into the evacuated space adjacent the solid component over its whole length thereby helping to ensure the formation of a self-setting grouting composition of uniform strength when the cartridge is used.
An anchoring cartridge for use in anchoring a reinforcing or fixing element in a borehole in a substrate, said cartridge comprising:
A method of anchoring a reinforcing or fixing element in a borehole in a substrate, which comprises selecting at least one anchoring cartridge comprising a frangible casing formed from an inert, liquid-impermeable material, the casing containing a particulate liquid-settable solid component in an amount such that it occupies a volume which is less than the normal free volume of the casing, and the cartridge being at least partially evacuated so as to cause the casing to be in contact with the solid component over substantially its whole length within the casing, immersing said cartridge in a liquid capable of reacting with said liquid-settable solid component to form a self-setting grouting composition, perforating the casing of the immersed cartridge to allow said liquid to be drawn rapidly into the evacuated space adjacent the solid component, withdrawing the perforated cartridge from said liquid, inserting the cartridge into a borehole and thereafter inserting a reinforcing or fixing element into the borehole in a manner such as to rupture the cartridge and cause the contents thereof to form a grouting composition around the element which when set will anchor the element in the borehole.
Dependencies are inferred from the claim text.