Yieldable cambered arch support assembly

Abstract

An arch support assembly for withstanding the effects of rock burst in underground mines, which includes a spaced aligned series of arch supports, each support having a spaced pair of upright side support columns with an upwardly cambered cap beam arch having opposite ends therefore transversely meeting and secured respectively to the upper ends of the side columns at an obtuse angle. The arch supports are rigidly tied together and provided with a roof supported by the cap beams to provide in combination an arch support assembly. A yielding connection is provided between the upright side columns and the cap beam ends whereby the cambered cap beams are permitted to flex downwardly under an impact load on the roof and the cap beam ends are thereby permitted to extend transversely a controlled limited amount relative to the upright side columns under a yieldable interference friction securement

1 . In an arch support assembly for withstanding the effects of rock burst in underground mines, including a spaced aligned series of arch supports, each support having a spaced pair of upright side support columns with an upwardly cambered cap beam having opposite ends thereof transversely meeting and secured respectively to the upper ends of said columns at an obtuse angle, said arch supports rigidly tied together and provided with a roof supported by said cap beams to provide in combination said arch support assembly, the improvement comprising;
 a yielding connection provided between said upright columns and said cap beam ends whereby said cambered cap beams are permitted to flex downwardly under an impact load on said roof and said cap beam ends are thereby permitted to extend transversely a controlled limited amount relative to said upright columns under a yieldable interference friction securement fit.   
     
     
         2 . The arch support assembly of  claim 1 , including tie rods tying adjacent of said spaced arch supports together with portions of said roof spanning therebetween under compression. 
     
     
         3 . The arch support assembly of  claim 2 , wherein said cap beams are flanged metal I-beams, said roof consisting of parallel beam segments confined at their opposite ends by said beam flanges and retained transversely to and between adjacent cap beams under longitudinal compression. 
     
     
         4 . The arch support assembly of  claim 3 , wherein said beam segments are selected from one or more of wood, plastic and metal. 
     
     
         5 . The arch support assembly of  claim 3 , wherein said support columns are also flanged metal I-beams with parallel beam wall segments confined at their opposite ends by said column beam flanges. 
     
     
         6 . The arch support assembly of  claim 1 , said yielding connection including fasteners secured through apertures elongated in the direction of extension of said cap beams. 
     
     
         7 . The arch support assembly of  claim 6 , wherein said fasteners have heads which correspond in shape to said apertures whereby said heads are drawn into said apertures after initially sliding with a frictional fit with an applied impact load. 
     
     
         8 . The arch support assembly of  claim 1 , said yielding connection consisting of a clamped connection. 
     
     
         9 . The arch support assembly of  claim 8 , wherein said clamped connection is a clamped TH-Profile of a predetermined limited length. 
     
     
         10 . An arch support assembly for withstanding the effects of rock burst in an underground mine, comprising:
 an aligned series of spaced arch supports, each support including a spaced pair of upright side support columns with an upwardly cambered cap beam having opposite ends thereof transversely secured to upper ends of said upright support columns with a yielding friction fit connection permitting a controlled limited amount of yield;   a roof structure spanning between each adjacent set of cap beams; and   tie rods tying said adjacent cap beams together with said roof structure thereby retained under compression.   
     
     
         11 . The arch support assembly of  claim 10 , said roof structure comprised of a parallel series of beam segments. 
     
     
         12 . The arch support assembly of  claim 11 , wherein said beam segments are selected from one or more of wood, plastic and metal. 
     
     
         13 . The arch support assembly of  claim 10 , said yielding connection including fasteners secured through apertures elongated in the direction of extension of said cap beams. 
     
     
         14 . The arch support assembly of  claim 13 , wherein said fasteners have heads which correspond in shape to said apertures whereby said heads are drawn into said apertures after initially sliding with a frictional fit with an applied impact load. 
     
     
         15 . The arch support assembly of  claim 10 , said yielding connection consisting of a clamped connection. 
     
     
         16 . The arch support assembly of  claim 15 , wherein said clamped connection is a clamped TH-Profile of a predetermined limited length.