E - Fixed Constructions – 21 – D
Patent
E - Fixed Constructions
21
D
E21D 11/14 (2006.01) E21D 11/00 (2006.01) E21D 21/00 (2006.01)
Patent
CA 2104143
A pair of truss brackets are secured to the roof of an underground passage adjacent to opposing ribs of the passage. The truss brackets each include a roof engaging surface and a truss supporting arm member extending from the roof engaging surface. A pair of U-bolts are supported by the arm members of the truss brackets. Each arm member extends horizontally from the truss bracket to an enlarged end portion of the arm member. The U-bolt is horizontally movable in a vertically hanging position on the arm member and is restrained by the enlarged end portion from disengagement from the arm member. The U-bolts are pivoted on the truss brackets to a horizontal position for connection to truss members which are connected to each other and tensioned to apply an uplifting force to the roof. As the truss members are connected and tensioned, the U-bolts are retained for a range of horizontal movement on the arm members to facilitate adjustments in the position of the U-bolts on the truss brackets.
Une paire de consoles est fixée au toit d'un passage souterrain au droit de nervures opposées. Les consoles sont constituées d'une surface de fixation au toit et d'un crochet faisant saillie sous ladite surface, la partie terminale du crochet étant horizontale et se terminant par un renflement. € chacun des crochets est suspendu un étrier fileté libre de se mouvoir horizontalement, mais retenu sur le crochet par le renflement d'extrémité. En usage, les étriers sont ramenés en position horizontale sur les crochets pour être raccordés à des tiges qui sont ensuite raidies de manière à soutenir le toit. Pour le raccordement et la mise sous tension des tiges, la liberté de mouvement horizontal des étriers est limitée afin de faciliter leur positionnement sur les crochets.
Calandra Frank Jr.
Frease Jerry E.
Kovacs Lajos
Stankus John C.
Stewart Eugene H.
Jennmar Corporation
Macrae & Co.
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