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1. A prefabricated structure for constructing open air works, particularly motorway flyovers, underpasses, bridges, tunnels, underground carparks and the like, including a plurality of prefabricated elements (5, 7) formed from reinforced concrete able to define the side walls and the deck (9) of the work with adjacent longitudinal sections of the structure (1) intended to rest on a foundation (3) formed at the base of the work, characterised m that each part of the structure (1) includes a pair of prefabricated side elements (5) which rest on the foundation (3) through an associated static hinge (11) , and are intended to be disposed symmetrically with respect to the axis of the work so as to assume a substantially L-shape configuration m the installed condition, and a substantially rectilinear prefabricated element (7 interposed centrally between two side elements '5) and anchored thereto to define a central portion of the deck (9) of the work.

2. A structure according to Claim 1, characterised m that each side element (5) includes three rectilinear bodies (5a, 5b, 5c) of which a first end body (5a1 defines an upright of the structure (1) , an intermediate body (5b) defines an inclined part, and another, end body (Sc) defines a bracket, these bodies (5a, 5b, 5c) being adapted to be articulated together between the prefabrication stage and the final positioning stage by bending the reinforcement rods of the element (5) which extend between adjacent bodies .

3. A structure according to Claim 2, characterised in that each first end body (5a) of each side element (5) is intended to be installed in a position inclined with respect to the vertical at an angle of less than approximately 15°.

4. A structure according to any of Claims 1 to 3 , characterised m that each of the said first bodies (5a) includes a projection (lla) defined by a cylindrical surface and intended to constitute a half-portion of the said static hinge (11) .

5. A structure according to Claim 4, characterised in that each static hinge (11) includes a hollow half-portion (lib) delimited by a cylindrical surface corresponding with that of the said projection (lla), formed in situ between the first body (5a) of the associated side element (5) and the foundation (3) by a concrete casting ( 12) .

6. A structure according to Claim 5, characterised in that a layer of antifriction plastics material (13) is interposed between the said half -portions (lla, lib) of each static hinge (11) .

7. A structure according to any of Claims 4 to 6 , characterised in that close to the projection (lla) of the said first bodies (5a) there are adjustable support means (15, 16) able to support at least the weight of the associated side element (5) during the assembly of the structure (1) and before the second half-portion (lib) of the associated static hinge (11) is operative.

8 A structure according to any of Claims 1 to 7, characterised m that the side elements (5) and/or the central elements (7) are provided with reference and mutual retention means (18, 19, 21, 21a, 22, 23, 25) for fixing them together before anchoring them by means of a rigidifymg casting (27) .

9. A structure according to Claim 8, characterised that each central element (5) is provided with opposite nose-like end projections (18) which extend along its central axis and are intended to engage associated seats (19) formed at the free ends of the bracket bodies (5c) of the side elements (5) .

10. A structure according to Claim 9, characterised m that the central element (7) and/or the side elements (5) are provided with adjustable screw members (21, 25) for mutual connection, these being connected to one of these elements and cooperating with the other of these elements so as to enable the central element (7) to be fixed to the side elements (5) during the assembly of the structure (1) .

11. A structure according to any of Claims 1 to 10, characterised that reinforcing rods positioned m situ m the joints between several side elements and central elements of adjacent sections (1) of the structure are incorporated m the rigidifymg castings (27) which anchor a central element (7) and a pair of side elements (5) together.