Covering apparatus, which comprises: - a support structure provided with at least two lateral beams that are parallel to each other and side-by-side, each longitudinally extended along a corresponding first extension direction; - a plurality of covering blades arranged one after the other according to said first extension direction, each of such covering blades extended along a second extension direction substantially orthogonal to said first extension direction, and provided with two opposite ends associated with said respective lateral beams; said covering blades being movable between a closure position, in which said covering blades are arranged partially superimposed, each over the next, covering an underlying ground surface, and at least one open position, in which said covering blades are arranged each spaced from the next, delimiting passage openings between them; - movement means actuatable to slide along at least one of said lateral beams between a retreated position and an advanced position; said covering apparatus being characterized in that it further comprises: - a plurality of orientation guides fixed along at least one of said lateral beams at the ends of said plurality of covering blades, each of such orientation guides at least partially extended along a path which is arranged on a plane substantially orthogonal to the second extension directions of said covering blades and is extended between one first part closer to said movement means and at least one second part further from said movement means; each said covering blade comprising, at at least one said end thereof: - a first coupling element, which is rotatably constrained to said movement means around a rotation axis substantially parallel to the second extension direction of said covering blade; - a second coupling element slidably constrained in the corresponding said orientation guide, such second coupling element: - with said movement means in said retreated position, is arranged in the first part of said path, with said covering blade in said closure position, - with said movement means in said advanced position, is arranged in the second part of said path, with said covering blade in said at least one open position. - a support structure provided with at least two lateral beams that are parallel to each other and side-by-side, each longitudinally extended along a corresponding first extension direction; - a plurality of covering blades arranged one after the other according to said first extension direction, each of such covering blades extended along a second extension direction substantially orthogonal to said first extension direction, and provided with two opposite ends associated with said respective lateral beams; said covering blades being movable between a closure position, in which said covering blades are arranged partially superimposed, each over the next, covering an underlying ground surface, and at least one open position, in which said covering blades are arranged each spaced from the next, delimiting passage openings between them; - movement means actuatable to slide along at least one of said lateral beams between a retreated position and an advanced position; - a plurality of orientation guides fixed along at least one of said lateral beams at the ends of said plurality of covering blades, each of such orientation guides at least partially extended along a path which is arranged on a plane substantially orthogonal to the second extension directions of said covering blades and is extended between one first part closer to said movement means and at least one second part further from said movement means; - a first coupling element, which is rotatably constrained to said movement means around a rotation axis substantially parallel to the second extension direction of said covering blade; - a second coupling element slidably constrained in the corresponding said orientation guide, such second coupling element: - with said movement means in said retreated position, is arranged in the first part of said path, with said covering blade in said closure position, - with said movement means in said advanced position, is arranged in the second part of said path, with said covering blade in said at least one open position. - with said movement means in said retreated position, is arranged in the first part of said path, with said covering blade in said closure position, - with said movement means in said advanced position, is arranged in the second part of said path, with said covering blade in said at least one open position.