High-strength anchor system, safe room bulkhead, and method of anchoring a support to mine strata
AssigneeKennedy Metal Products & Buildings, Inc.
InventorsWilliam R. Kennedy, John M. Kennedy
Life of this patent
Estimating the term…
Abstract
A high-strength anchor system for anchoring a support to mine strata is disclosed. The system includes an anchor plate and a connecting member on the anchor plate for connection of the support to the anchor plate. Anchor bolts extend through bolt holes in the anchor plate into bore holes in the mine strata. Load-spreading devices extend from respective bolt holes in the anchor plate into the bore holes. The load-spreading devices have outside diameters larger than outside diameters of the anchor bolts for spreading shear loads exerted on the anchor bolts over larger areas of the mine strata. A method of installing such a system and a safe room bulkhead using such a system are also disclosed.
Claims28
A high-strength anchor system for anchoring a support to mine strata, said system comprising
- an anchor plate adapted to be secured to mine strata with an outer face of the plate facing the mine strata and an inner face of the plate facing away from the mine strata,
- a connecting member on the inner face of the anchor plate for connection of the support to the anchor plate,
- anchor bolt holes in the anchor plate spaced at intervals around the plate,
- anchor bolts extending through the bolt holes in the anchor plate into bore holes in the mine strata,
- fasteners for securing the anchor plate to the anchor bolts, and
- load-spreading devices extending from respective bolt holes in the anchor plate into respective bore holes in the mine strata, said load-spreading devices outside diameters larger than outside diameters of the anchor bolts for spreading shear loads exerted on the anchor bolts over larger areas of the mine strata.
A high-strength anchor unit for anchoring a support to mine strata, said anchor unit comprising
- an anchor plate adapted to be secured to mine strata with an outer face of the plate facing the mine strata and an inner face of the plate facing away from the mine strata,
- a connecting member on the inner face of the anchor plate for connection of the support to the anchor unit,
- anchor bolt holes in the anchor plate spaced at intervals around the plate for receiving anchor bolts extending into bore holes in the mine strata, and
- load-spreading sleeves extending from respective bolt holes in the anchor plate for reception in respective bore holes in the mine strata, said sleeves having inside diameters sized for receiving respective anchor bolts and outside diameters greater than the inside diameters for spreading shear loads exerted on the anchor bolts over larger areas of the mine strata.
A method of anchoring a support to mine strata, comprising
- placing an anchor unit on the mine strata,
- using bolt holes in the anchor unit as guides to drill bore holes in the mine strata,
- inserting anchor bolts through the bolt holes into respective bore holes,
- surrounding each anchor bolt with a load-spreading device having an outside diameter greater than said outside diameter of the anchor bolt for spreading shear loads exerted on the anchor bolts over larger areas of the mine strata,
- fixing the anchor bolts in the bore holes, and
- securing the anchor plate to the anchor bolts in preparation for connecting a support to the anchor plate.
A bulkhead for a safe room in a mine, the bulkhead comprising:
- a wall structure extending between side walls of the safe room;
- a support supporting the wall;
- and
- an anchor system anchoring the support to mine strata, said anchor system comprising
- an anchor plate anchored to the mine strata with an outer face of the plate facing outside of the safe room and an inner face of the plate facing inside the safe room,
- a connecting member on the inner face of the anchor plate connecting the support to the anchor plate,
- anchor bolt holes in the anchor plate spaced at intervals around the plate,
- anchor bolts extending through respective anchor bolt holes into bore holes in the mine strata,
- fasteners securing the anchor plate to the anchor bolts, and
- load-spreading devices extending from respective anchor bolt holes in the anchor plate into respective bore holes, said load-spreading devices having outside diameters larger than outside diameters of the anchor bolts for spreading shear loads exerted on the bolts over larger areas of the mine strata.
Dependencies are inferred from the claim text.