Patent ID: 6220785
Filing Date: 2001-04-24
Classification: E21F

Abstract:
A stopping for a passageway in a mine comprising first and second walls extending transversely of the passageway from one side thereof to the other and heightwise of the passageway from the floor to the roof thereof, said walls being permanently held in generally vertical parallel relation spaced apart longitudinally of the passage and held against displacement longitudinally of the passageway, and a filling in the space between the walls having a force-transmitting relationship with the walls, each of said walls and filling having strength in tension to constitute the walls and the filling as a permanently integrated composite structure in which the walls act as flanges in conjunction with the filling as a web resistant to forces such as may be encountered in the passageway tending to bend the structure in one direction or the other longitudinally of the passageway.