US 6,682,268 B2Granted

Method and apparatus for secondary roof support in an underground mine

AssigneeEarl Products, Inc.

InventorsRoy Lee Robertson, Jr., James Earl, Jr.

Life of this patent

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Abstract

A method for providing secondary roof support in an underground mine such as to reduce the hazard of localized crumbling or deterioration of a mine roof. The apparatus generally comprises a slightly convex steel plate, crafted to cradle a roof bolt and which is supported by the base plate of the primary roof control system. The apparatus is utilized with standard primary roof bolt systems. By applying an upward pressure on the roof and effecting a larger coverage area for each roof bolt, the opportunity for drawrock separation to begin is reduced, and the exposure of the elements to drawrock strata in the vicinity of the bolt is eliminated. The method includes the step of utilizing the apparatus, with convex portion of the lateral plate facing upwards, before the placement of the base plate and roof bolt.

Claims4

Dependent claims

A method for providing primary and secondary roof support in an underground mine comprising the steps of:

a.) drilling a hole into the roof of the underground mine and into upper level rock strata;
b.) inserting a container of adhesive material into said hole;
c.) positioning a lateral support member featuring a plurality of weep holes disposed along the periphery of said lateral support member adjacent the roof of said underground mine centered over said hole;
d.) positioning a base plate adjacent said lateral support member;
and
e.) inserting a roof bolt through said base plate and said support member into said hole, the insertion of said roof bolt fracturing the container of adhesive material, thus allowing said adhesive material to be distributed around said roof bolt, securing said roof bolt in said hole and securing said base plate and support member to the roof of said underground mine for providing primary and secondary roof support.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 09/944,666Filed 31 Aug 2001 · us provisional application
Priority: 1 Sep 2000
Published: US 2002/0028113 A17 Mar 2002
Granted: 27 Jan 2004
Term ends: Not estimatedThe source records don’t support an estimate.

Classification3 codes

E21D 21/0093
Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection: accessories
E21D 21/0086
Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection: bearing plates
E21D
Shafts