Abstract: A movable and dynamic work after construction linking two points separated by a natural or man-made obstacle, allows the permanent crossing of this obstacle. The work includes a deformable apron (1) which extends between said two points. The work comprises a set of elongated elements (2, 3). An assembly of several pairs of elements (2, 3) is disposed along the apron (1). The work comprises drive means (8) disposed at one end or at both ends of said work for adjusting the apron (1) lengthwise. The drive means (8) are arranged so that, when the means (8) are actuated, they drive the assembly of the pairs of elements (2, 3), so as to bulge the central portion of the apron (1) when the means (8) are actuated.

Abstract: A movable and dynamic work after construction linking two points separated by a natural or man-made obstacle, allows the permanent crossing of this obstacle. The work includes a deformable apron (1) which extends between said two points, a set of elongated elements (2, 3), having three openings (5A, 5A?, 5B), a first opening (5A, 5A?) at each end of the elements (2, 3) and a second intermediate opening (5B) disposed between the first two openings (5A, 5A?) present at the ends of the elements (2, 3), said openings (5, 5A, 5A?) receiving ball joints for forming hinges (4), each element (2, 3) consisting of a first short portion between a first opening (5A) and the intermediate opening (5B) and of a second longer portion between the other first opening (5A?) and the intermediate opening (5B), the elements (2, 3) being disposed in pairs, movable in rotation, around a central hinge (4) constituted by a ball joint in the intermediate openings (5B) of two elements (2, 3).