US 5,292,209 AGranted

Bearing plate

AssigneeJennmar Corporation

InventorsFrank Calandra, Jr., John C. Stankus, Eugene H. Stewart

Life of this patent

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Abstract

An elongated channel member for supporting the surface of an underground rock formation includes a base portion with a bearing surface for contacting the rock strata and an opposite surface having a longitudinally extending central rib and flanged edges for resisting deflection and bending of the channel member under the load of the rock strata. A plurality of openings spaced a preselected distance apart extend through the central rib. A bearing plate is positioned in overlying abutting relation with each opening in the channel member. The bearing plate includes embossed areas and longitudinally flanged edges that are complementary in shape with the central rib and flanges on the channel to securely engage the bearing plate on the channel member. Thus, the bearing plate engages the channel member to restrain longitudinal and lateral movement of the bearing plate on the channel member and stiffen the channel member to resist bending. An anchor bolt extends through the aligned openings in the bearing plate and channel member into a bore hole drilled in the rock formation. Anchoring the bolt in the bore hole compresses the bearing plate against the channel member to urge the channel member into compressive relation with the surface of the rock formation to support the rock formation.

Claims20

Dependent claims

Apparatus for supporting a rock formation comprising,

an elongated member having a base portion with a length substantially greater than a width defining longitudinal edges forming a channel therebetween,
said base portion having a bearing surface for contacting the rock formation and an opposite surface,
means for reinforcing said elongated member extending the length of said base portion and positioned centrally on said opposite surface within said channel,
at least one opening extending through said means for reinforcing said elongated member,
a bearing plate including a contact surface and an outer surface, said contact surface positioned in overlying abutting relation with said elongated member opposite surface,
a circular embossed area extending outwardly from said plate outer surface and defining a recessed portion having a bottom wall with a central opening therethrough,
said recessed portion bottom wall positioned in said opening in said elongated plate and positioned adjacent to said means for reinforcing said elongated member to restrain longitudinal movement of said plate on said elongated member,
said plate central opening aligned with said elongated member opening,
a longitudinal embossed area extending outwardly from said opposite sides of said circular embossed area of said bearing plate into overlying relation with said means for reinforcing said elongated member,
said longitudinal embossed area projecting from said plate outer surface in a configuration complementary with the configuration of said means for reinforcing said elongated member,
said plate longitudinal embossed area engaged to said means for reinforcing said elongated member to restrain lateral movement of said plate on said elongated member to stationarily position said plate on said elongated member, and
anchor means extending through said aligned openings into the rock formation and bearing against said plate recessed portion for urging said elongated member into compressive engagement with the rock formation to support the rock formation.

9 more elements

A method for supporting a rock formation comprising the steps of,

positioning an elongated channel member in contact with a planar surface of a rock formation,
reinforcing the channel member with a longitudinal embossment extending the length of the channel member,
positioning openings in the channel member in spaced relation along the length of the embossment,
positioning a bearing plate having a contact surface in overlying abutting relation with the channel member around each opening therethrough,
positioning a recessed portion of the bearing plate within the opening of the channel member so that an opening in the bearing plate is aligned with the opening in the channel member,
restraining longitudinal movement of the bearing plate on the channel member,
restraining lateral movement of the bearing plate on the channel member, and
extending an anchor bolt through the aligned openings in the bearing plate and the channel member into engagement with the rock formation to compress the bearing plate against the channel member to maintain the channel member in bearing contact with the surface of the rock formation.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 08/061,841Filed 14 May 1993
Granted: 8 Mar 1994
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

E21D 11/006
Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by…:…
E21D 21/0086
Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection: bearing plates
F16B 43/00
Washers or equivalent devices
F16B 2043/008
Washers or equivalent devices; Other devices for supporting bolt-heads or nuts: with a cavity for receiving the bolt head in order to make a flush…