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CROSS-REFERENCE TO RELATED APPLICATION 
       [0001]    This application claims the benefit of provisional application Serial No. 61/324,836 filed on Apr. 16, 2010. 
     
    
     FIELD OF THE INVENTION 
       [0002]    The present invention refers to foldable structures method/system for creating parts of a construction such as domes, roofs or similar for any building and/or tunnels and/or bridges for pedestrian and/or vehicle traffic, including the method/system for their transportation, assembly and an unfolding method to place the structure in the construction site. 
       Description of the Prior Art 
       [0003]    Constructions systems and methods using prefabricated structures are known and desired in the art. Using prefabricated structures helps the builder save in costs and time and allows the building or construction to be ready to be used in less time. 
         [0004]    Foldable and transportable roofs are known in the prior art. For example document CN201268965 discloses a mobile home with a foldable roofing, which comprises an integral floor structure, four wall bodies, two slanting roofs and two gables. 
         [0005]    Publication US No. US2009014044 discloses a folding shed including a roof with a first roof section pivotally connected to a first sidewall and a second roof section pivotally connected to a second sidewall. 
         [0006]    Publication No. JP2007170150 disclose a structure having the gable roof comprises: four wall surfaces formed by hinging both side edges of a front face constitutive body and a rear face constitutive body hinged through center columns, and both side edges of a pair of side face constitutive bodies facing each other; and the roof section formed by hinging a ridge part and the upper edges of a pair of inclined roof boards. 
         [0007]    Furthermore, roof connections are also known in the art, for example publication No. US2009078297 discloses an automatic control device of foldable tent connecting to several roof strut sets consisting of several segments serially connected in radial; wherein, said control device is typically comprised of a central standing base containing a sliding hub, a spring and a tappet roller at inside. 
         [0008]    Furthermore publication No. US2007131265 discloses a top frame of foldable tent including a set of foldable roof braces and a set of coordinated sub-braces constructing the main frame is typically employed with a hydraulic tappet fixed between the static pivot hub pivoting all the sub-braces and spreader pivoting all the roof braces with both ends, by means of the jack-up and hold-on features of the hydraulic tappet, said spreader is pushed down and kept in the ultimate position to bring the entire roof braces q and sub-braces to expend out. Said structure has fewer parts, simple, convenient for manufacturing and combination features. 
       BRIEF DESCRIPTION OF THE INVENTION 
       [0009]    The present invention refers to a transportable and foldable structure for building a construction, more specifically building roofs, ceilings, domes or similar or tunnels or bridge constructions for pedestrian and/or vehicle traffic, wherein both are placed between at least two elements of the construction. Specifically, the present invention refers to transportable, foldable and coupling structure units for building constructions, specifically roofs, domes, ceilings, tunnels or bridges for pedestrian and/or vehicle traffic, in which coupling and folding structure units are to be placed between two elements of the construction. 
         [0010]    An element of the construction to which the coupling and folding structures are fixed is preferably a column or a base of the construction. The construction may be selected among any type of construction, such as cement, plywood, pvc, modified marine containers, mobile homes, or other building structures. 
         [0011]    The transportable and foldable structure may be comprised by at least one coupling and folding structure unit. 
         [0012]    If the transportable and foldable structure comprises one coupling and folding structure unit, the coupling and folding structure unit comprises at least a first fixing element, such as an anchor, which will fasten the folding structure unit to a first element of the construction, such as a column or base. The first fixing element may be alternately coupled to a further fixing element of a different coupling and folding structure unit by means of a fastening element or coupled to coupling and folding device of a different coupling and folding structure unit. The first fixing element is placed at a first end of the construction. Furthermore, the coupling and folding structure unit comprises at least a second fixing element in the opposite end of the coupling and folding structure unit than the first fixing element, similar to the first fixing element, which will fasten the transportable and foldable structure to a second element of the construction, such as a second column or base to anchor the structure. Alternately, the second fixing element may be coupled to a further fixing element of a different coupling and folding structure unit by means of a fastening element or coupled to coupling and folding device of a different coupling and folding structure unit. The second fixing element is placed at a second end of the transportable and foldable structure, which is opposite to and may be co-lineal with the first end of the transportable and foldable structure. In between the first fixing element and the second fixing element at least one coupling and folding device is provided. In between the first fixing element and the coupling and folding device a first rod is provided. In between the coupling and folding device and the second fixing element a second rod is provided. Both rods are coupled with the coupling and folding device. Furthermore, both rods when fully extended are substantially co-lineal one to another. When the coupling and folding structure unit is fully extended a certain angle which is at least 90°, more preferably 140° and yet more preferably at least 160° may be present among the lower face of the first rod and the lower face of the second rod. However, a 180° angle between the lower face of the first rod and the lower face of the second rod may be achieved. An actuating device, such as a rod, bolt, pin, screw, wire or thread, is attached from the first end of the transportable and foldable structure to the second end of the transportable and foldable structure. When actuated, the actuating device rotates the coupling and folding device so as to move the second rod in regards to the first rod, so that the second rod is in a substantially parallel position in regards to the first rod when in a folded position. The first rod may be fastened with regards to the coupling and folding device, while the second rod is movable with regards to the coupling and folding device. The movement of the second rod with regards to the coupling and folding device may be provided by means known in the art, such as a bearing. 
         [0013]    The transportable and foldable structure may comprise two folding structure units. A second folding structure unit comprises a first fixing element, such as an anchor, which will fasten the transportable and foldable structure to a first element of the construction, such as a column or base. The second folding structure unit further comprises at least two coupling and folding devices. A first coupling and folding device will fasten the second folding structure unit to a first folding structure unit of the construction. The first coupling and folding device is placed at a second end of the second folding structure unit, opposite to the first end. In between the first fixing element and the first coupling and folding device, a second coupling and folding device is provided. In between the first fixing element and the second coupling and folding device a first rod is provided. In between the second coupling and folding device and the first coupling and folding device a second rod is provided. Both rods are coupled with the second coupling and folding device. When both rods are fully extended, that is, when the second folding structure unit is fully extended, the first rod and the second rod are substantially co-lineal one to another. When fully extended, a certain angle which is at least 90°, more preferably 140° and yet more preferably 160° is present among the lower face of the first rod and the second rod. However, a 180° angle between the lower face of the first rod and the lower face of the second rod may be achieved. An actuating device, such as a rod, wire, bolt, pin, screw or thread, is attached from the first end of the first folding structure unit to the second end of the first folding structure unit. When actuated, the actuating device rotates the second coupling and folding device so as to move the second rod in regards to the first rod, so that the second rod is in a substantially parallel position in regards to the first rod when in a folded position. The first rod may be fastened with regards to the second coupling and folding device, while the second rod is movable with regards to the second coupling and folding device. The movement of the second rod with regards to the folding device may be provided by means known in the art, such as a bearing. The first folding structure unit is built essentially in the same manner as when the transportable and foldable structure comprises one folding unit. The coupling between the first folding structure unit and the second folding structure unit is by means of the first coupling and folding device of the second folding structure unit and one of the two fixing elements of the first folding structure unit is carried by conventional means known in the art, such as threaded holes, bolts, pin, screw, wire or threads and nuts. 
         [0014]    The transportable and foldable structure may comprise three or more folding structure units. The first and second folding structure units are formed in a similar manner to the first folding structure unit disclosed for the one folding structure unit for the transportable and foldable structure. A third folding structure unit, which is placed in between the first and second folding structure units, comprises a first coupling and folding device at one end of the third folding structure unit, proximate to the first folding structure unit, which will fasten the third folding structure unit to the first folding structure unit by means of the first coupling and folding device of the third folding structure unit and by means of the second fixing element of the first folding structure unit. Furthermore, the third folding structure unit comprises a second coupling and folding device at a second end of the third folding structure unit, opposite to the first end of the third folding structure unit, which will fasten the third folding structure unit to the second folding structure unit by means of the second coupling and folding device of the third folding structure unit and by means of the second fixing element of the second folding structure unit. In between the first coupling and folding device and the second coupling and folding device of the third folding structure, a third coupling and folding device is provided in the third folding structure unit. In between the first coupling and folding device and the third coupling and folding device of the third folding structure a first rod is provided. In between the third coupling and folding device and the second coupling and folding device of the third folding structure a second rod is provided. Both rods are coupled with the third coupling and folding device. When both rods are fully extended, that is, when the third folding structure unit is fully extended, the first rod and the second rod are substantially co-lineal one to another. When fully extended, a certain angle which is at least 90°, more preferably 140° and yet more preferably at least 160° is present among the lower face of the first rod and the second rod. However, a 180° angle between the lower face of the first rod and the lower face of the second rod may be achieved. An actuating device, such as a rod, wire or thread, is attached from the first end of the third folding structure unit to the second end of the third folding structure unit. When actuated, the actuating device rotates the third coupling and folding device so as to move the first rod in regards to the second rod, so that the first rod is in a substantially parallel position in regards to the second rod when in a folded position. The second rod may be fastened with regards to the third coupling and folding device, while the first rod is movable with regards to the third coupling and folding device. The movement of the first rod with regards to the third coupling and folding device may be provided by means known in the art, such as a bearing. The coupling between the first folding structure unit and the third folding structure unit, by means of the first coupling and folding device of the third folding structure unit and the second fixing element of the first folding structure unit is carried by conventional means known in the art, such as threaded holes, bolts, pin, screw, wire or threads or nuts. Likewise, the coupling between the second folding structure unit and the third folding structure unit, by means of the second coupling and folding device of the third folding structure unit and the second fixing element of the second folding structure unit is carried by conventional means known in the art, such as threaded holes, bolts pin, screw, wire or threads and nuts. 
         [0015]    In all the embodiments, the coupling and folding devices may be a substantially cylindrical form, however may take any desired shape. The inner part of the folding device should be hollow and more preferably, hollow and threaded. Therefore, a bolt, pin, screw, wire or threads may be threaded in the inner part of the coupling and folding device, in such a manner that the same bolt may fasten two or more folding structure units in a substantially parallel manner. Furthermore, a bolt, pin, screw, wire or threads may be threaded in the inner part of the coupling and folding device in such a manner that the same bolt may fasten two or more folding structure units in a substantially co-lineal manner. Therefore, the transportable and foldable structure is actually comprised by folding structure units in a substantially parallel manner and by folding structure units in a substantially co-lineal manner. The ends of the bolts, pin, screw, wire or thread are fastened by nuts. 
         [0016]    The fixing elements may be alternately coupled to each other by means of fastening elements. That is, instead of coupling the fixing elements to a second, third, fourth, or more folding structure units, the fixing elements are coupled to fastening elements. The fixing elements have a hole, which may be threaded, in which a bar which may be threaded is placed. The fastening elements comprise a lower part and an upper part, which are coupled together by means of conventional coupling means known in the art, such as threaded holes, bolts, pin, screw, wire or threads and nuts. 
         [0017]    The fastening elements may be formed by any shape, however, shapes with smooth and constant walls are preferred. The fastening elements have at least two connections, each wall of the fastening element having at least one connection. The fastening elements preferably have at least three connections and even more preferably at least four connections. When a folding structure unit is coupled with a fastening element, part of the fixing element, which is an extension of one of the two rods of the folding structure unit, is placed within a connection of the fastening element. The connections are generally hollow and are usually placed between the lower part and the upper part of the fastening element. Furthermore, the connections have a width or diameter which is less than the width or diameter of the wall of the node in which the connection is present. The connections are formed in shape so that at least part of the fixing element may rest within the connection. Given that the fixing element (“joint”) has a bar in its hole, and given that the bar is generally broader than the width of the connection, when the lower part and the upper part are coupled, the folding structure unit is coupled and fixed with regards to the fastening element. As stated before, the fastening elements or joints may have one or more connections for each wall. Therefore, the fastening elements are prepared to receive at least one folding structure unit per wall. 
         [0018]    The fastening elements are provided as relief devices for a large amount of folding structure units. That is, if a broad or large area is to be covered with the transportable and foldable structure, then fastening elements need to be used since otherwise transportation of the transportable and foldable structure would be difficult. Furthermore, the fastening elements are used as nodes, that is, if a broad or large area is to be covered with the transportable and foldable structure fastening elements need to be used so that each foldable structure unit does not fold or vibrate when the transportable and foldable structure is installed. 
         [0019]    When two or more folding structure units which are substantially co-lineal are present, the actuating devices between the first folding structure unit and the second folding structure unit may be connected to each other, so that when one of the at least two actuating devices is actuated, the at least two folding structure units may be simultaneously extended or folded. Reels may be added to the actuating devices so as to coil or uncoil the actuating devices. 
         [0020]    When a first pair of two or more folding structure units which are substantially co-lineal are present, and when second pair of two or more folding structure units which are also substantially co-lineal and which are substantially parallel to the first pair of folding structure units, wherein the first pair of folding structure units may be substantially parallel to the second pair of folding structure units, the first pair of folding structure units may be intercalated in position with the second pair of folding structure units with regards to the first and second fixed elements of the construction. That is, since in the first pair of folding structure units both folding structure units are coupled by means of the first coupling and folding devices and the second fixing element, and since the first coupling and folding devices are coupled laterally, then the coupling means have a determined width. Given that the coupling means have a determined width, both folding structure units are substantially co-lineal with each other, however not necessarily co-lineal with the construction. That is, the first pair of folding structure units intercalates with the second pair of folding structure unit in the point where the at least two substantially co-lineal folding structure units are coupled together, that is, in the respective first coupling and folding device of both the first and second substantially co-lineal folding structure units of the first pair, and in the point when the other at least two substantially co-lineal folding structure units are coupled together, that is, in the respective first coupling and folding device of both the first and second substantially co-lineal folding structure units of the second pair, which is parallel to the first pair. 
         [0021]    Therefore, a transportable and foldable structure may be formed by multiple folding devices some of which are substantially co-lineal and some of which are substantially parallel. For installation purposes, depending on the area to be covered by the transportable and foldable structure, the transportable and foldable structure is placed and/or transported in a vehicle which is capable of setting a first fixing element proximate to a first fixed element of the construction. The first fixing element is coupled to the first fixed element of the construction. At least a first part of the transportable and foldable structure is then extended in a substantially horizontal manner. Specifically at least a first pair of substantially co-lineal folding structure units and a second pair of substantially co-lineal folding structure units, which are substantially parallel to the first pair of folding structure units are extended. These first and second pair of folding transportable and foldable structure may then coupled to another first and second pair of folding transportable and foldable structure by means of a fastening element. These newly coupled first and second pair of transportable and foldable structure are again extended. This is carried out continuously until the transportable and foldable structure is complete. Finally, a second fixing element is placed proximate to a second fixed element of the construction. The second fixing element is coupled to the second fixed element of the construction. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0022]    The present invention will be further understood when referenced with the following detailed description and with the following figures. Additionally, other aspects will become apparent when referenced with the detailed descriptions along with the following figures. 
           [0023]      FIG. 1  shows a front view of a first embodiment for the foldable structure unit, in which two fixing elements are present and one coupling and folding device is present. 
           [0024]      FIG. 2  shows a front view of a second embodiment for the foldable structure unit, in which one fixing element is present and two coupling and folding devices are present. 
           [0025]      FIG. 3  shows a front view of a third embodiment for the foldable structure unit, in which three coupling and folding devices are present. 
           [0026]      FIG. 4  shows a front view of a fourth embodiment for the foldable structure unit, in which three coupling and folding devices are present and in which the two rods are substantially at 180° one from another. 
           [0027]      FIG. 5  shows an upper view of a first foldable structure and a second folding structure unit, both of which are substantially parallel to each other, in which both the first foldable structure and the second foldable structure are being coupled together. 
           [0028]      FIG. 6  shows an upper view of the first foldable structure unit and the second foldable structure unit, in which both foldable structures units are coupled. 
           [0029]      FIG. 7  shows an upper view of the first part of a first embodiment for the fastening element. 
           [0030]      FIG. 8  shows a front view of the first embodiment for the fastening element. 
           [0031]      FIG. 9  shows a front view of the first embodiment for the fastening element, in which the lower part and upper part are separated. 
           [0032]      FIG. 10  shows an upper view of the first part of a second embodiment for the fastening element. 
           [0033]      FIG. 11  shows a front view of the second embodiment for the fastening element. 
           [0034]      FIG. 12  shows a front view of the second embodiment for the node, in which the lower part and upper part are separated. 
           [0035]      FIG. 13  shows a front view of a first and second pair of parallel folding structure units being coupled with another first and second pair of parallel folding structure units by means of a fastening element. 
           [0036]      FIG. 14  shows a front view of a first and second pair of parallel folding structure units being coupled with another first and second pair of parallel folding structure units wherein both pairs are intercalated. 
           [0037]      FIG. 15  shows an upper view of a first, second, third and fourth folding structure units being coupled by means of a fastening element. 
           [0038]      FIG. 16  shows a first step of the process for the installation of the transportable and foldable structure. 
           [0039]      FIG. 17  shows a second step of the process for the installation of the transportable and foldable structure. 
           [0040]      FIG. 18  shows a third step of the process for the installation of the transportable and foldable structure. 
           [0041]      FIG. 19  shows a fourth step of the process for the installation of the transportable and foldable structure. 
           [0042]      FIG. 20  shows a transportable and foldable structure fixed to two constructions, in this case, marine container acting as columns or anchor elements. 
           [0043]      FIG. 21  shows a transportable and foldable structure fixed to two fixed elements of other conventional a construction. 
           [0044]      FIG. 22  shows an upper view of multiple folding structure units, substantially parallel, substantially co-lineal and substantially perpendicular, the substantially co-lineal folding structure units being coupled by a node. 
       
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
       [0045]    The following description is made in reference to  FIGS. 1 through 15  and  22 . The present invention refers to a transportable and foldable structure  2  for constructions to be placed between two elements  4 ,  4 ′ of the construction  6 . The transportable and foldable structure  2  may be selected to create any of a roof, ceilings, domes or similar or tunnels or bridge constructions for pedestrian and/or vehicle traffic. Specifically, the present invention refers to transportable, foldable and coupling structure units  20  for building a transportable and foldable structure  2  for building constructions such as roofs, ceilings, domes or similar, or tunnels or bridge constructions for pedestrian and/or vehicle traffic, wherein the transportable and foldable structure  2  is to be placed between two elements  4 ,  4 ′ of the construction. An element  4 ,  4 ′ of the construction to which the transportable and foldable structure  2  is fixed, is preferably at least one column of the construction  6 . The construction  6  may be selected among traditional construction structures, such as cement structures or similar structures, such as wooden or metal structures, to other construction structures, such as container, more preferably marine containers. 
       First Embodiment 
       [0046]    The transportable and foldable structure  2  may be comprised by at least one coupling and folding structure unit  20 . 
         [0047]    If the transportable and foldable structure  2  comprises one folding structure unit  20 , the folding structure unit  20  comprises at least a first fixing element  26 , such as an anchor, which will fasten the transportable and foldable structure  2  to a first element  4  of the construction  6 , such as a column or base. The first fixing element  26  may be alternately coupled to a further fixing element  26 ′ of a different folding structure unit  20 ′ by means of a fastening element  50  or coupled to a coupling and folding device of a different folding structure  120 ,  220 . The first fixing element  26  is placed at a first end  22  of the transportable and foldable structure. Furthermore, the folding structure unit  20  comprises at least a second fixing element  28  in the opposite end  24  of the folding structure unit than the first fixing element end  22 , wherein the second fixing element  28  is similar to the first fixing element, and will fasten the transportable and foldable structure  2  to a second element  4 ′ of the construction  6 . Alternately, the second fixing element  28  may be coupled to a further fixing element  26 , of a different folding structure unit  20 ′ by means of a fastening element  50  as will be explained below or coupled to a coupling and folding device of a different folding structure unit  120 ,  220  as will be explained below. The second fixing element  28  is placed at the second end of the transportable and foldable structure  2 , opposite to and co-lineal with the first end of the transportable and foldable structure. In between the first fixing element  26  and the second fixing element  28  at least one coupling and folding device  30  is provided. In between the first fixing element  26  and the coupling and folding device a first rod  40  is provided. In between the coupling and folding device  30  and the second fixing element  28  a second rod  42  is provided. Both rods  40 ,  42  are coupled with the coupling and folding device  30 . Furthermore, both rods  40 ,  42  when fully extended are substantially co-lineal one to another. When the coupling and folding structure unit  20  is fully extended a certain angle which is at least 90°, more preferably 140° and yet more preferably at least 160° may be present among the lower face  44  of the first rod  40  and the lower face  44  of the second rod  42 . However, a 180° angle between the lower face  44  of the first rod  40  and the lower face  44  of the second rod  42  may be achieved. An actuating device  36 , such as a rod, wire or thread, is attached from the first end  22  of the transportable and foldable structure to the second end  24  of the transportable and foldable structure, either directly or indirectly through the coupling and folding device  30 . When actuated, the actuating device  36  rotates the coupling and folding device  30  so as to move the second rod  42  in regards to the first rod  40 , so that the second rod  42  is in a substantially parallel position in regards to the first rod  40  when in a folded position. That is, when the actuating device  36  actuates the folding of the coupling and folding structure unit  20 , the second end  24  is drawn to be proximate to the first end  22 , as well as the second rod  42  is drawn to be proximate and substantially parallel with the first rod  40 . The first rod  40  may be fastened with regards to the coupling and folding device  30 , while the second rod  42  is movable with regards to the coupling and folding device  30 . The movement of the second rod  42  with regards to the coupling and folding device  30  may be provided by means known in the art, such as a bearing. 
       Second Embodiment 
       [0048]    The transportable and foldable structure  2  may comprise two substantially co-lineal folding structure units  20 ,  120 ′. If the transportable and foldable structure comprises two folding structure units  20 ,  120 ′ a second folding structure unit  120  comprises a first fixing element  126 , such as an anchor, which will fasten the transportable and foldable structure  2  to a first element  4  of the construction  6 , such as a column. Alternately, the first fixing element  126  may be coupled to another fixing element  26 ,  336  of a different folding structure unit  120  by means of a fastening element  50  or coupled to a coupling and folding device of a different folding structure unit  120 ,  220  as will be explained below. The first fixing element  126  is placed at one end  122  of the second folding structure unit  120 . The second folding structure unit  120  further comprises at least two coupling and folding devices  130 ,  130 ′. A first coupling and folding device  130 ′ of the second folding structure unit  120  will fasten the second folding structure unit  120  to a first folding structure unit  20  of the construction. The first coupling and folding device  130 ′ of the second folding structure unit  120  is placed at a second end  124  of the second folding structure unit  120 , opposite to the first end  122 . In between the first fixing element  126  and the first coupling and folding device  130 ′ a second coupling and folding device  130  is provided. In between the first fixing element  126  and the first coupling and folding device  130 ′ a first rod  140  is provided. In between the second coupling and folding device  130 ′ and the first coupling and folding device  130  a second rod  142  is provided. Both rods  140 ,  142  are coupled with the second coupling and folding device  130 . When both rods  140 ,  142  are fully extended, that is, when the second folding structure unit  120  is fully extended, the first rod  140  and the second rod  142  are substantially co-lineal one to another. When the second folding structure unit  120  is fully extended, a certain angle which is at least 90°, more preferably 140° and yet more preferably at least 160° is present among the lower face  144  of the first rod  140  and the second rod  142 . However, a 180° angle between the lower face  144  of the first rod and the lower face  144  of the second rod may be achieved. An actuating device  136 , such as a rod, wire or thread, is attached from the first end  122  of the second folding structure unit  120  to the second end  124  of the second folding structure unit  120 , either directly or indirectly by means of the second coupling and folding device  130 . When actuated, the actuating device  136  rotates the second coupling and folding device  130  so as to move the second rod  142  in regards to the first rod  140 , so that the second rod  142  is in a substantially parallel position in regards to the first rod  140  when in a folded position. That is, when the actuating device  136  actuates the folding of the second coupling and folding structure unit  120 , the second end  124  is drawn to be proximate to the first end  122 , as well as the second rod  142  is drawn to be proximate and substantially parallel with the first rod  140 . The first rod  140  may be fastened with regards to the second coupling and folding device  130 , while the second rod  142  is movable with regards to the second coupling and folding device  130 . The movement of the second rod  142  with regards to the second coupling and folding device  130  may be provided by means known in the art, such as a bearing. 
         [0049]    The first folding structure unit  20  which is similarly built to the first embodiment comprises the first fixing element  26  and a second fixing element  28 , wherein the second fixing element  28  is placed at one end  124  of the second folding structure unit  120 . The second folding structure unit  120  further comprises the at least two coupling and folding devices  130 ,  130 ′. A first coupling and folding device  130 ′ and the second fixing element  28  will fasten the second folding structure unit  120  to the first folding structure unit  20 . The first coupling and folding device  130 ′ when coupled to the second fixing element  28  will allow the folding of both the first and second folding structure units  20 ,  120 . The actuating devices  36 ,  136 , may be attached between themselves, either directly or indirectly by means of the coupling and folding devices  30 ,  130 ,  130 ′. When actuated, the actuating devices  36 ,  136  rotate the coupling and folding device, the second coupling and folding device  130  and the first coupling and folding device  130 ′, so as to move the second rods  42 ,  142  in regards to the first rods  40 ,  140 , so that the second rods  42 ,  142  are in a substantially parallel position in regards to the first rod  40 ,  140  when in a folded position. That is, when the actuating devices  36 ,  136  actuate the folding of the coupling and folding structure units  20 ,  120 , so that the second ends  24 ,  124  are drawn to be proximate to the first ends  22 ,  122 , as well as the second rods  42 ,  142  are drawn to be proximate and substantially parallel with the first rods  40 ,  140 . Further to the above configuration of the first and second coupling and folding structure units  20 ,  120 , the second rod  142  may be fastened with regards to the first coupling and folding device  130 ′, while the second rod  42  is movable with regards to the first coupling and folding device  130 ′. The movement of the second rod  42  with regards to the first coupling and folding device  130 ′ may be provided by means known in the art, such as a bearing. 
       Third Embodiment 
       [0050]    The transportable and foldable structure  2  may comprise three or more folding structure units  20 ,  20 ′,  220 . A first and second folding structure unit  20 ,  20 ′ are formed in a similar manner to the first folding structure unit  20  above disclosed for the first embodiment. A third folding structure unit  220 , which is placed in between the first and second folding structure units  20 ,  20 ′, comprises a first coupling and folding device  230 ′ at one end  222  of the third folding structure unit  220 , proximate to where the first folding structure unit  20  will be fastened, wherein the first coupling and folding device  230 ′ and the first fixing element  26  will fasten the third folding structure unit  220  to the first folding structure unit  20 . Furthermore, the third folding structure unit  220  comprises a second coupling and folding device  230 ″ at a second end  224  of the third folding structure unit, opposite to the first end  222  of the third folding structure unit. The second coupling and folding device  230 ″ will fasten the third folding structure unit  220  to the second folding structure unit  20 ′ by means of the second coupling and folding device  230 ″ of the third folding structure unit and by means of the second fixing element  28 ′ of the second folding structure unit  20 ′. In between the first coupling and folding device  230 ′ and the second coupling and folding device  230 ″, a third coupling and folding device  230  is provided in the third folding structure unit  220 . In between the first coupling and folding device  230 ′ and the third coupling and folding device  230  a first rod  242  is provided. In between the third coupling and folding device  230  and the second coupling and folding device  230 ″ a second rod  240  is provided. Both rods  240 ,  242  are coupled with the third coupling and folding device  230 . When both rods  240 ,  242  are fully extended, that is, when the third folding structure unit  220  is fully extended, the first rod  242  and the second rod  240  are substantially co-lineal one to another. When the third folding structure unit  220  is fully extended, a certain angle which is at least 90°, more preferably 140° and yet more preferably at least 160° is present among the lower face  244  of the first rod  242  and the lower face  244  of the second rod  240 . However, a 180° angle between the lower face  244  of the first rod  242  and the lower face  244  of the second rod  240  may be achieved. An actuating device  236 , such as a rod, wire or thread, is attached from the first end  224  of the third folding structure unit  220  to the second end  222  of the third folding structure unit  220 . When actuated, the actuating device  236  rotates the third coupling and folding device  230  so as to move the first rod  242  in regards to the second rod  240 , so that the first rod  242  is in a substantially parallel position in regards to the second rod  240  when in a folded position. The second rod  240  may be fastened with regards to the third coupling and folding device  230 , while the first rod  242  is movable with regards to the third coupling and folding device  230 . The movement of the first rod  242  with regards to the third coupling and folding device  230  may be provided by means known in the art, such as a bearing. 
         [0051]    The first folding structure unit  20  comprises the first fixing element  26 , such as an anchor, which will fasten the transportable and foldable structure to a first element  4  of the construction  6 , such as a column or base and the second fixing element  28  of the first folding structure unit  20  or to further units  120 ,  220 , wherein the second fixing element  28  is placed at one end  224  of the third folding structure unit  220 . The second folding structure unit  20 ′ comprises the first fixing element  26 ′, such as an anchor, which will fasten the transportable and foldable structure to a second element  4 ′ of the construction  6 , such as a column or base or to further units  120 ,  220 , wherein the second fixing element  28 ′ is placed at one end  222  of the third folding structure unit  220 . The third folding structure unit  220  further comprises the at least three coupling and folding devices  230 ,  230 ′,  230 ″. A first coupling and folding device  230 ′ and a fixing element  26 ,  28  will fasten the third folding structure unit  220  to the first folding structure unit  20 . A second coupling and folding device  230 ″ and a fixing element  26 ′,  28 ′ will fasten the third folding structure unit  220  to the second folding structure unit  20 ′. The first coupling and folding device  230 ′ when coupled to the first fixing element  26  will allow the folding of both the first and third folding structure units  20 ,  220 . The actuating devices  36 ,  236 , may attached between themselves, either directly or indirectly by means of the coupling and folding devices  30 ,  230 ,  230 ′,  230 ″. When actuated, the actuating devices  36 ,  236  rotate the coupling and folding device  30 , the third coupling and folding device  230  and the first coupling and folding device  230 ′, so as to move the second rods  42 ,  242  in regards to the first rods  40 ,  240 , so that the second rods  42 ,  242  are in a substantially parallel position in regards to the first rods  40 ,  240  when in a folded position. That is, when the actuating devices  36 ,  236  actuate the folding of the coupling and folding structure units  20 ,  220 , the second ends  24 ,  224  are drawn to be proximate to the first ends  22 ,  222 , as well as the second rods  42 ,  242  are drawn to be proximate and substantially parallel with the first rods  40 ,  240 . Further to the above configuration of the first and third coupling and folding structure units  20 ,  220 , the rod  242  may be fastened with regards to the coupling and folding device  230 ′, while the rod  40  is movable with regards to the coupling and folding device  230 ′. The movement of the rod  40  with regards to the coupling and folding device  230 ′ may be provided by means known in the art, such as a bearing. 
         [0052]    The second coupling and folding device  230 ″ when coupled to the fixing element  26 ′,  28 ′ will allow the folding of both the second and third folding structure units  20 ′,  220 . The actuating devices  36 ′,  236 , may attached between themselves, either directly or indirectly by means of the coupling and folding devices  30 ′,  230 ,  230 ′,  230 ″. When actuated, the actuating devices  36 ′,  236  rotate the coupling and folding device  30 ′, the third coupling and folding device  230  and the second coupling and folding device  230 ″, so as to move the first rods  40 ′,  240  in regards to the second rods  42 ′,  242 , so that the second rods  42 ′,  242  are in a substantially parallel position in regards to the first rods  40 ′,  240  when in a folded position. That is, when the actuating devices  36 ′,  236  actuate the folding of the coupling and folding structure units  20 ′,  220 , the second ends  24 ′,  224  are drawn to be proximate to the first ends  22 ′,  222 , as well as the first rods  40 ′,  240  are drawn to be proximate and substantially parallel with the second rods  42 ′,  242 . Further to the above configuration of the second and third coupling and folding structure units  20 ′,  220 , the rod  240  may be fastened with regards to the coupling and folding device  230 ″, while the rod  42  is movable with regards to the coupling and folding device  230 ″. The movement of the rod  42  with regards to the coupling and folding device  230 ″ may be provided by means known in the art, such as a bearing. 
         [0053]    In all the embodiments, the coupling and folding devices  30 ,  130 ,  130 ′,  230 ,  230 ′,  230 ″ (from hereinafter only referred to as  30  unless necessary) may be a substantially cylindrical form, however may take any desired shape. The inner part  32  of the folding device  30  should be hollow and more preferably, hollow and threaded. Therefore, a bolt  8  may be threaded in the inner part  32  of one of the two side ends  34 ,  34 ′ of the coupling and folding device  30 , in such a manner that the same bolt  8  may fasten two or more folding structure units  120 ,  120 ′ in a substantially parallel manner. Furthermore, a bolt  8  may be threaded in the inner part  32  of one of the two side ends  34 ,  34 ′ of the coupling and folding device  30  in such a manner that the same bolt  8  may fasten two or more folding structure units  20 ,  120 ,  220  in a substantially co-lineal manner. Therefore, the transportable and foldable structure  2  may be comprised by folding structure units  120 ,  120 ′ in a substantially parallel manner and by folding structure units  20 ,  120 ,  220  in a substantially co-lineal manner. The ends of the bolts  8  are fastened by nuts  10 . 
         [0054]    The fixing elements  26 ,  28 ,  126 ′ (from hereinafter  26 ,  28 , unless necessary) may be alternately coupled to each other by means of fastening elements  50 . When four or more coupling and folding structure units  20  are used, it is preferred that the transportable and foldable structure  2  uses at least one fastening element  50 . That is, instead of coupling the fixing elements to a coupling and folding device o another unit, the fixing elements  26 ,  28  are coupled to fastening elements  50 . The fixing elements  26 ,  28  may be threaded, in which a bar which may be threaded is placed. The fastening elements comprise a lower part  52  and an upper part  54 , which are coupled together by means of conventional coupling means known in the art, such as threaded holes, bolts, pin, screw, wire or threads and nuts. 
         [0055]    The fastening elements  50  may be formed by any shape, however, shapes with smooth and constant walls are preferred. The fastening elements  50  have at least two connections, wherein at least two walls  56 ,  56 ′ of the fastening element  50  having at least one connection  58 . The fastening elements  50  preferably have at least three connections  58  and even more preferably at least four connections  58 . When a folding structure unit  20  is coupled with a fastening element  50 , part of the fixing element  26 ,  28 , which is an extension of one of the two rods  40 ,  42  of the folding structure unit, is placed within a connection  58  of the fastening element  50 . The connections  58  are generally hollow and are usually placed between the lower part  52  and the upper part  54  of the fastening element  50 . Furthermore, the connections  58  have a width or diameter which is less than the width or diameter of the wall of the node  60  which the fastening element  50  is forming. The connections  58  are formed in such a manner so that at least part of the fixing element  26 ,  28  may rest within the connection  58 . Given that the fixing element  26 ,  28  has a bar  18 , and given that the bar  18  is generally broader than the width of the connection  58 , when the lower part  52  and the upper part  54  are coupled, the folding structure unit  20  is coupled and fixed with regards to the fastening element  50 . As stated before, the fastening elements  50  may have one or more connections  58  in each wall  56 ,  56 ′. Therefore, the fastening elements  50  are prepared to receive at least one folding structure unit  20  per wall  56 ,  56 ′. 
         [0056]    The fastening elements  50  are provided as relief devices for a large amount of folding structure units  20 . That is, if a broad or large area is to be covered with the transportable and foldable structure  2 , then fastening elements  50  need to be used, since otherwise transportation of the transportable and foldable structure would be difficult. Furthermore, the fastening elements  50  are used as nodes  60 , that is, if a broad or large area is to be covered with the transportable and foldable structure  2  fastening elements need to be used so that each foldable structure unit  20  does not fold or vibrate when the transportable and foldable structure  2  is installed. 
         [0057]    When two or more coupling and folding structure units  20 ,  120  which are substantially co-lineal are present, the actuating devices  36 ,  136  between the first folding structure unit  20  and the second folding structure unit  120  may be connected to each other, so that when one of the at least two actuating devices  36 ,  136  is actuated, the at least two folding structure units  20 ,  120  may be simultaneously extended or folded as above described. Reels (not shown) may be added to the actuating devices  36 ,  136  so as to coil or uncoil the actuating devices  36 ,  136 . 
         [0058]    When more than four coupling and folding structure units  20 ,  120 ,  220 ,  20 ′ which are substantially co-lineal are present, the actuating devices  36 ,  136 ,  236 ,  36 ′ between the first coupling and folding structure unit  20 , the second coupling and folding structure unit  120 , the third coupling and folding structure unit  220  and fourth coupling and folding structure unit  20 ′, may be connected to each other, so that when one of the at least one actuating devices  36  or  36 ′ which is in the end of the transportable and foldable structure  2  is actuated, the at least four folding structure units  20 ,  120 ,  220 ,  20 ′ may be simultaneously extended or folded as above described. Reels (not shown) may be added to the actuating devices  36 ,  136 ,  236 ,  36 ′ so as to coil or uncoil the actuating devices  36 ,  136 ,  236 ,  36 ′. 
         [0059]    When a first pair  62  of two or more folding structure units  20 ,  120  which are substantially co-lineal are present, and when second pair  64  of two or more folding structure units  20 ′,  120 ′ which are substantially co-lineal between themselves and which are substantially parallel to the first pair  62  of folding structure units, hence the first pair  62  of folding structure units may be substantially parallel to the second pair  64  of folding structure units, the first pair  62  of folding structure units may be intercalated in position with the second pair  64  of folding structure units with regards to the fixed elements  4 ,  4 ′ of the construction  6 . That is, since in the first pair  62  both folding structure units  20 ,  120  are coupled by means of the first coupling and folding device  130 ′ of the second coupling and folding structure unit  120  and the fixing element  26 ,  28 , and since the first coupling and folding device  130  is coupled sideways with regards to the fixing element  26 , then the coupling means have a determined width. Given that the coupling means have a determined width, both folding structure units  20 ,  120 ′ are substantially co-lineal with each other, however not necessarily co-lineal with the fixed elements  4 ,  4 ′. The same may be applied for the second pair  64 . That is, the first pair  62  of folding structure units intercalates with the second pair  64  of folding structure units in the point where the first and second pairs  62 ,  64  of coupling and folding structure units are coupled together, that is, in the respective first coupling and folding device  130 ′ of both the first and second pairs  62 ,  64  of substantially co-lineal folding structure units. 
         [0060]    Therefore, a transportable and foldable structure  2  may be formed by multiple folding devices  20  some of which are substantially co-lineal and some of which are substantially parallel. For installation purposes, depending on the area to be covered by the transportable and foldable structure  2 , the transportable and foldable structure  2  is transported in a vehicle  12  which is capable of setting at least a first fixing element  26  proximate to a first fixed element  4  of the construction. The first fixing element  26  is coupled to the first fixed element  4  of the construction. At least a first part of the transportable and foldable structure  2  is then extended in a substantially horizontal manner by means of the actuating devices  36 . Specifically at least a first pair  62  of substantially co-lineal folding structure units and a second pair  64  of substantially co-lineal folding structure units, which are substantially parallel to the first pair  62  of folding structure units are extended. These first and second pair  62 ,  64  of folding transportable and foldable structures  2  may then coupled to another first and second pair  62 ,  64  of folding transportable and foldable structure by means of a fastening element  50 . These newly coupled first and second pair  62 ,  64  of folding transportable and foldable structures are again deployed. This is carried out continuously until the transportable and foldable structure  2  is complete. Finally, a second fixing element  28  is placed proximate to a second fixed element  4 ′ of the construction. The second fixing element  28  is coupled to the second fixed element  4 ′ of the construction. 
         [0061]    Alterations to the structure described in the present, shall be able to be foreseen by those with expertise in the field. However, it must be understood, that the present description is related with the preferred embodiments of the invention, which are solely for illustrative purposes, and must not be construed as a limitation of the invention. All modifications which do not depart from the spirit of the invention are included within the body of the attached claims.

Summary:
A roof, ceiling, dome, bridge, tunnel or similar structure for a construction, a system and method thereof, the structure configured to move between a folded position and an extended position, the structure comprising a folding structure unit with a first end and a second end, the first end being co-lineal with the second end when the structure is in an extended position, a first coupling and folding device between the first end and the second end, an actuating device connected from the first end to the second end, a first rod between the first end and the first coupling and folding device and a second rod between the second end and the first coupling and folding device, and wherein the actuating device and the coupling and folding device are configured to move the transportable and foldable structure from a folded position to an extended position and from an extended position to a folded position. A plurality of structures may be co-lineally connected between themselves. A plurality of structures may be connected in a parallel manner between themselves. A plurality of structures may be perpendicularly connected between themselves. Connection devices are also disclosed.