Yieldable support prop and method

摘要

A yield support prop for a mine includes a first metal tube extending from the mine floor having a first portion having a first outside diameter and a second portion having a second outside diameter. The prop includes a second metal tube that is disposed about the first portion and extends toward the mine roof, when the second tube receives a load from the mine roof, the second portion deforms the second tube and expands the second tube creating resistance against the load from the mine roof. A method for supporting a mine roof. A method for building a yieldable mine prop.

主权项

1. A yield support prop for a mine comprising:
a first metal tube extending from the mine floor having a first portion having a smooth first outside diameter and a second portion having a second outside diameter, the second portion includes at least one metal bead welded to the first portion or a metal ring welded to the first portion, the height of the second portion extends from the first portion at least 0.15 inches more than the inside diameter of the second tube, the yield strength of the first tube is greater than the yield strength of the second tube; and a second metal tube having a smooth inner diameter that is disposed about the first portion and extends toward the mine roof, when the second tube receives a load from the mine roof, the second tube slides down over the first tube and the second portion deforms the second tube and expands the second tube creating resistance against the load from the mine roof.