TELESCOPIC MINE ROOF SUPPORT

摘要

A longitudinally yieldable support for underground roof support includes a first support section with a first elongate outer shell filled with a solid compressible filler material and a second support section filled with a second solid compressible filler material with a second elongate outer shell extending above the first elongate outer shell. The second support section has density that is greater than a density of the first solid compressible filler material. A pair of attachment members are coupled to the second elongate outer shell and are configured for lifting the second elongate outer shell relative to the first elongate outer shell and for securing the second elongate outer shell relative to the first elongate outer shell once lifted.

主权项

1. A longitudinally yieldable support, comprising:
a first support section comprising a first elongate outer shell filled with a first solid compressible filler material; and a second support section comprising a second elongate outer shell extending above the first elongate outer shell, the second elongate outer shell having an outer diameter that is different than a diameter of the first elongate outer shell to allow the second elongate outer shell to slide relative to the first elongate outer shell, and the second elongate outer shell filled with a second solid compressible filler material having a density that is at least as great as a density of the first solid compressible filler material.