Method and apparatus for anchoring roof bolts

Patent · Tue Apr 07 00:00:00 EDT 1987

OSTI ID:6555533

Hipkins, E C; Locotos, F M; Comfort, J D

This patent describes an anchor bolt assembly of the type used in mine roofs and the like in which the anchor bolt assembly is positioned in a bore hole of a rock formation. The bolt assembly includes an elongated bolt shaft with a head on one end and threads on the other end, and with a mechanical expansion anchor including a spreader on the threaded end. A quick-setting resin cartridge is positioned in the bore hole above the threaded end of the bolt shaft. The anchor bolt assembly is secured to the rock formation by both the expansion anchor and the quick-setting resin. The improvement described here comprises a stop connected to the bolt shaft immediately below the expansion anchor and an elongated helical coil having an upper end attached to the stop and positioned external of and surrounding a substantial length along the bolt shaft. The coil has a direction of coil so as to urge resin upwardly toward the threaded end while the spreader moves downwardly and while the bolt shaft is rotated in one continuous direction to achieve mixing of the resin and to secure the mechanical anchor to the rock formation.

• Assignee: H and S Machine and Supply Co., Inc., Coraopolis, PA
• Patent Number(s): US 4655645
• OSTI ID: 6555533
• Resource Relation: Patent File Date: Filed date 31 Dec 1984
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
ROOF BOLTS
FASTENING
INSTALLATION
UNDERGROUND MINING
ANCHORS
BOREHOLES
COAL MINES
EXPANSION
POSITIONING
RESINS
ROCK MECHANICS
SHAFTS
THREADED JOINTS
CAVITIES
EQUIPMENT
FABRICATION
JOINING
JOINTS
MACHINE PARTS
MECHANICS
MINES
MINING
MINING EQUIPMENT
ORGANIC COMPOUNDS
ORGANIC POLYMERS
PETROCHEMICALS
PETROLEUM PRODUCTS
POLYMERS
UNDERGROUND FACILITIES
012031* - Coal
Lignite
& Peat- Underground Mining- Strata Mechanics & Control- (1987-)