System for covering flat surfaces

1. A system for covering flat surfaces on a support structure formed by support poles maintained in position by a network of tie-rods, both the support poles and the tie-rods being fixed on a flat surface by means of pins, the system comprising:

the support structure comprising:

the support poles;

the tie-rods; and

a plurality of pairs of elongated support elements having a lower portion positioned on the support poles and being joined together in raised position in proximity to their upper end, to form a plurality of pairs of slopes on which protection nets or protection sheets are positioned, which in an open position cover the area below the support structure, and which in a closed position are compact and amassed between adjacent support poles of a same row of support poles, movement from the open position to the closed one and vice versa being obtained through the sliding of the protection nets or protection sheets along the elongated support elements by means of a movement means,

wherein, on top of the support structure above the protection nets or protection sheets, electrical energy generation units are installed, and

wherein the joining point and maximum height or top of each pair of elongated support elements, is positioned on the tie-rods.

2. The system of claim 1 , wherein the elongated support elements are constrained to the support poles at a substantially intermediate height with respect to the height of each respective support pole itself.

3. The system of claim 1 , wherein the elongated support elements are metal cables or metal bars, or section bars.

4. The system of claim 1 , wherein the protection nets or protection sheets are associated with the elongated support elements by means of a plurality of constraining means, the plurality of constraining means being slidable along the elongated support elements.

5. The system of claim 1 , wherein the movement means for moving the protection nets or protection sheets comprise an annular belt arranged substantially in a position adjacent to the elongated support elements, which substantially follows the length thereof, moved by means of at least one drive pulley associated with each of the support poles and driven by a driven pulley positioned at the top of the support structure, the belt then being arranged along the entire path of a slidable constraining means, which are also constrained to the belt by means of a bracket.

6. The system of claim 5 , wherein each of the at least one drive pulley associated with each of the support poles is rotated by means of an electric motor, or it can be manually moved by means of a rod.

7. The system of claim 5 , wherein the driven pulley is associated with a top support of the support structure.

8. The system of claim 1 , wherein the elongated support elements are fixed to the support poles and to the tie-rods by means of fixing means comprising:

a ring crimped on a pole provided with eyelets, to which the end of the corresponding elongated support element is fixed when the pole provided with eyelets is an intermediate pole of the support structure;

a bush that crosses the pole provided with eyelets as well as the elongated support element, which is fixed to the ground, if the pole provided with eyelets is the final pole of the support structure; and

a crimped support crimped on the tie-rod, which, in its lower portion, has fixing eyelets for the corresponding elongated support element.

9. The system of claim 8 , wherein a driven pulley is associated with a top support of the support structure.

10. The system of claim 1 , wherein the protection nets or protection sheets are shade nets or sheets used in agriculture.

11. The system of claim 10 , wherein the protection nets are made of polyethylene stabilized against UV rays, with a shading degree of 50-90%.

12. The system of claim 1 , wherein the protection sheets are anti-hail sheets.

13. The system of claim 1 , wherein the protection sheets are transparent sheets.

14. The system of claim 1 , in which the electrical energy generation units are photovoltaic panels or wind units directly placed on the top of the support poles.

15. A system for covering flat surfaces on a support structure formed by support poles maintained in position by a network of tie-rods, both the support poles and the tie-rods being fixed on a flat surface by means of pins, the system comprising:

the support structure comprising:

the support poles;

the tie-rods; and

a plurality of pairs of elongated support elements having a lower portion positioned on the support poles and being joined together in raised position in proximity to their upper end, to form a plurality of pairs of slopes on which protection nets or protection sheets are positioned, which in an open position cover the area below the support structure, and which in a closed position are compact and amassed between adjacent support poles of a same row of support poles, movement from the open position to the closed one and vice versa being obtained through the sliding of the protection nets or protection sheets along the elongated support elements by means of a movement means,

wherein, on top of the support structure above the protection nets or protection sheets, electrical energy generation units are installed,

wherein the protection nets or protection sheets are associated with the elongated support elements by means of a plurality of constraining means, the plurality of constraining means being slidable along the elongated support elements, and

wherein the constraining means comprise a sleeve made of two annular sectors provided with notches on an edge, such that, when the annular sectors are joined together form a groove that is crimped on the edge of the sheet, a through hole of the sleeve allows the sliding on the elongated support element.