Prestressed self-interlocking grille structure

Claim 2

The curved shelter comprising in combination: (a) a plurality of first kind of bars having first and second edges, each of which bars including a plurality of cutouts disposed along said first edge of said bars and further including one or more holes disposed intermediate each of two adjacent said cutouts, said bars curved to conform with a required surface geometry and disposed in a first direction; (b) a plurality of second kind of bars having first and second edges, each of which bars including a plurality of cutouts disposed along the said second edge of said bars and further including one or more holes disposed intermediate each of two adjacent said cutouts, said bars curved to conform with a required surface geometry and disposed in a second direction criss-crossing said plurality of first kind of bars wherein each of said cutouts on said first kind of bars engages each of said cutouts on said second kind of bars; whereby, said pluralities of first and second kind of bars are assembled into a network of bars providing a plurality of series of said holes on said first and second kind of bars lined up in said first and second directions; (c) a plurality of rods threaded through said plurality of series of holes lined up in said first and second directions; (d) a flexible covering stretched over said network of bars; and (e) a plurality of clips of U-shaped cross section clipped onto the edges of said first and second kind of bars holding down said flexible covering to said network of bars by the squeezing action.

Claim 3

The combination as set forth in claim 1 wherein said plurality of rods threaded through said plurality of series of holes lined up in said first direction are woven to said plurality of rods threaded through said plurality of series of holes lined up in said second direction.

Claim 4

The curved shelter structure comprising in combination: (a) a plurality of first kine of bars having first and second edges, each of which bars including a plurality of cutouts disposed along said first edge of said bars and further including a plurality of holes, each of said holes being disposed at and open to the closed end of each of said cutouts, said bars curved to conform with a required surface geometry and disposed in a first direction; (b) a plurality of second kind of bars having first and second edges, each of which bars including a plurality of cutouts disposed along the said second edge of said bars and further including a plurality of holes, each of said holes being disposed at and open to the closed end of each of said cutouts, said bars curved to conform with a required surface geometry and disposed in a second direction criss-crossing said plurality of first kind of bars wherein each of said cutouts on said second kind of bars; whereby, said pluralities of first and second kind of bars are assembled into a network of bars providing a first and second series of said holes on said first and second kind of bars lined up in a third direction and a fourth direction; (c) a first rods threaded through said plurality of series of holes lined up in said third direction; (d) a flexible covering stretched over said network of bars; and (e) a plurality of clips of U-shaped cross section clipped onto the edges of said first and second kind of bars holding down said flexible covering to said network of bars by the squeezing action.

Claim 5

The curved shelter structure comprising in combination: (a) a plurality of first kine of bars having first and second edges, each of which bars including a plurality of cutouts disposed along said first edge of said bars and further including a plurality of holes, each of said holes being disposed at and open to the closed end of each of said cutouts, said bars curved to conform with a required surface geometry and disposed in a first direction; (b) a plurality of second kind of bars having first and second edges, each of which bars including a plurality of cutouts disposed along the said second edge of said bars and further including a plurality of holes, each of said holes being disposed at and open to the closed end of each of said cutouts, said bars curved to conform with a required surface geometry and disposed in a second direction criss-crossing said plurality of first kind of bars wherein each of said cutouts on said second kind of bars; whereby, said pluralities of first and second kind of bars are assembled into a network of bars providing a first and second series of said holes on said first and second kind of bars lined up in a third direction and a fourth direction; (c) a first rods threaded through said plurality of series of holes lined up in said third direction; (d) a flexible covering stretched over said network of bars; and (e) a plurality of clips of U-shaped cross section clipped onto the edges of said first and second kind of bars holding down said flexible covering to said network of bars by the squeezing action.

Claim 6

The combination as set forth in claim 3 wherein a plurality of rods are threaded through said second series of holes lined up in said fourth direction.

Claim 7

The combination as set forth in claim 4 wherein said first rods threaded through said second series of holes lined up in said third direction and said plurality of rods threaded through said plurality of series of holes lined up in said fourth direction are woven to each other.