Roof bolt assembly having a sealing plug for preventing a deterioration of the mine roof

Patent · Tue Sep 15 00:00:00 EDT 1987

OSTI ID:5972092

Unrug, K F; Thompson, E D; Nandy, S K

This patent describes a roof bolt assembly for preserving the natural geological structure of a mine roof which consists of an elongated bolt rod with first and second distal ends, an expandable anchor threaded on the first end for operatively engaging the walls of a roof bolt hole bored in the mine roof at points inboard of the roof surface, a bolt head on the second end of the bolt rod, and a roof plate sandwiched between the roof surface and the bolt head. The entire assembly is pre-tensioned to tightly hold the roof plate against the roof surface. The hole bored in the roof is larger in diameter than the diameter of the roof bolt rod defining an annular space around the rod. The improvement comprises sealing means totally disposed within the annular space adjacent the second end of the bolt but spaced from the roof plate. The sealing means further being spaced from the roof surface such that a gap is formed between the roof surface and the sealing means. The sealing means preclude the entrance of air and moisture into the hole and the annular space around the rod is generally free from material in a region between the anchor and the sealing means such that the bolt is generally out of contact with the mine roof in this region.

• Assignee: NOV; NOV-87-082090; EDB-87-179614
• Patent Number(s): US 4693638
• OSTI ID: 5972092
• Resource Relation: Patent File Date: Filed date 22 Apr 1986
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
ROOF BOLTS
DESIGN
UNDERGROUND MINING
STRATA CONTROL
PLATES
ROOFS
SEALS
SUPPORTS
EQUIPMENT
MECHANICAL STRUCTURES
MINING
MINING EQUIPMENT
420206* - Engineering- Mining & Drilling Equipment & Facilities- (1980-1989)
422000 - Engineering- Mining & Underground Engineering- (1980-)