Spacer assembly and method

Details Spacer assembly and method Spacer assembly and method

1993-08-11

1995-07-25

Corbin, David H.

Hydraulic and earth engineering

Earth treatment or control

Shoring, bracing, or cave-in prevention

405288, E21D 1500

Patent

active

054356709

ABSTRACT:
The invention concerns a method and apparatus for providing yielding support for a hanging wall above a footwall in a mine working. A support assembly is installed between the hanging wall and the footwall, the assembly including a spacer (10), a pack (30) and a grout-inflatable bag (32). Grout is pumped into the bag (32) and is allowed to set to apply a vertical prestess force to the support assembly. The spacer (10) is substantially stiffer in compression than the pack (30), which is designed to yield under the compressive loading applied by the hanging wall. The use of a stiff spacer (10) serves to elevate the yielding pack to a suitble operative height without the allowable slenderness ratio for the pack to be exceeded.

REFERENCES:
patent: 1735974 (1929-11-01), O'Toole
patent: 4628658 (1986-12-01), Erasmus
patent: 5308196 (1994-05-01), Frederick

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