This involves 16 elevated metro stations in Panama City, which are resolved using a space frame structure composed of nodes and spheres assembled together with bolted connections. The structure has a vaulted shape, meeting the 8 vertical supports located on both longitudinal sides with 8 inverted pyramids that connect the space vault to the 8 support columns. The structure extends beyond the support level, reaching«to hug»the station to track level, forming a whimsical longitudinal curve as can be seen in the perspective photograph. The length of the stations is 45 meters high by 25 meters wide. The stations' cladding is aluminum on the roof and facades, with the aluminum on these facades being perforated.
The structural system used for the construction of the stations is basically made up of two types of elements: nodes and bars.
The node is a spherical component equipped with a series of threaded holes corresponding to the directions of the bars that must converge at it. The availability of possible bar access directions is practically total, being limited only by the minimum angle that two adjacent bars must maintain to avoid interference between them.
The bars are of tubular profile and have a conical bushing with an axial hole welded to each end. These bushings are traversed by screws with two threaded bodies with reverse threading directions, separated by a frustoconical surface which, after assembly, seats on the outer part of the spheres. This double threading direction allows for two tightening actions with a single turning direction on the screw: the tightening of the sphere and the tightening of the bar. The assembly ensures that the tightening is maintained, preventing the connection from loosening due to potential vibrations.
The retraction of the screw into the bar allows assembly and disassembly without altering the relative positions of the two spheres it connects, even when they are in their final position.
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