Fully grouted mine roof bolt with expansion anchor
View Patent ↗A reinforcement system characterized by being formed by a standard helical rod, an expansion head adapted to the thread of the rod, a conical element made of a plastic material, a tube or sheath made of corrugated plastic, a reinforcement plate, and a standard threaded reinforcement nut, according to the helical rod employed, in order to provide immediate mechanical anchoring and the option of subsequent mortar injection.
1. A reinforcement system comprising:
a helical rod,
an expansion head threadable onto the helical rod,
a conical element comprising plastic,
a sheath comprising plastic,
a reinforcement plate having a central opening, and
a threaded reinforcement nut threadable onto the helical rod and configured to provide immediate mechanical anchoring and the option of subsequent grout injection,
wherein the conical element comprises a sample perforation for ensuring that the system is completely injected.
2. The reinforcement system of claim 1 , wherein the expansion head is attached to a distal end of the helical rod.
3. The reinforcement system of claim 1 , wherein an annular gap is provided between the sheath and the helical rod for receiving grout therein.
4. The reinforcement system of claim 1 , wherein an exterior of the sheath includes projections.
5. A reinforcement system comprising:
a helical rod,
an expansion head threadable onto the helical rod,
a conical element comprising plastic,
a sheath comprising plastic,
a reinforcement plate having a central opening, and
a threaded reinforcement nut threadable onto the helical rod and configured to provide immediate mechanical anchoring and the option of subsequent grout injection, wherein the conical element comprises:
an injection nozzle that is exposed during assembly and fastening of the reinforcement system,
a sample perforation for ensuring that the system is completely injected,
a central bore with a first diameter configured to accept the helical rod and a second diameter into which the sheath is shimmed or inserted, and
a beveled concentric neck disposed on a side of the conical element.
6. The reinforcement system of claim 5 , wherein the beveled concentric neck has a chamfer that generates a seal with the reinforcement nut when the reinforcement nut is tightened, and
wherein an outer diameter of the beveled concentric neck shims the central opening of the reinforcement plate, and a frontal section of the conical element is adapted to shim with the internal shape of the reinforcement plate.
7. A reinforcement system comprising:
a helical rod,
an expansion head threadable onto the helical rod,
a conical element comprising plastic,
a sheath comprising plastic,
a reinforcement plate having a central opening, and
a threaded reinforcement nut threadable onto the helical rod and configured to provide immediate mechanical anchoring and the option of subsequent grout injection, wherein the reinforcement plate defines a first peripheral perforation and a second peripheral perforation,
wherein the first peripheral perforation is of sufficient size to allow passage of an injection nozzle of the conical element,
wherein the second peripheral perforation aligns with a sample perforation of the conical element, and
wherein the central opening of the reinforcement plate is configured to receive at least a portion of the conical element.