초록 ▼

A span construction having longitudinal cables extending between end supports, a flexible sheath enclosing the volume bounded by cables and end supports, a fan for forcing a gas through the sheath and gas escape holes on the underside of the sheath to raise the span in response to escaping gas. The

A span construction having longitudinal cables extending between end supports, a flexible sheath enclosing the volume bounded by cables and end supports, a fan for forcing a gas through the sheath and gas escape holes on the underside of the sheath to raise the span in response to escaping gas. The span may have an airfoil cross-section so that it is raised in response to cross wind loading.

대표청구항 ▼

A naturally sagging span construction comprising two opposing end supports, a flexible sheath attached to each of said end supports to form tubular a surface extending between said end supports, a plurality of longitudinal cables anchored to said end supports, said cables being disposed along and me

A naturally sagging span construction comprising two opposing end supports, a flexible sheath attached to each of said end supports to form tubular a surface extending between said end supports, a plurality of longitudinal cables anchored to said end supports, said cables being disposed along and mechanically linked to, said tubular surface, gas source means for forcing a gas into said sheath and gas escape means in said sheath for permitting said gas to escape from said sheath to produce a reaction force reducing the natural sag of said span.