ribs or intermediate sections 7 foil material covering the spaces delimited by the beams and ribs 8 and two wedge type panels of which it can be seen the upper profile beam 9 9 u2032 the attack beam of the upper module 1 forms the underground cover 17 shown also are the rainwater collector 18 of the lower module 3 the front rain collector 19 the underground engine compartments 20 and 20 u2032 and the structural supporting brackets 21 this figure shows clearly how the modules of one half are offset with respect to the modules of the other half so that they may be interposed half on the modules of the other half to allow proper rotation without interfering with its extensions or counterweights in the event that counterweight extensions are not used it is not necessary to maintain an offset of the modules fig4 shows a sequence of perspective views of the evolution of the enclosure looking from top to bottom 4 a enclosure completely deployed 4 b partial opening 4 c partial opening 4 d enclosure fully open fig5 shows a longitudinal sectional view of the deployed enclosure so that the modules which make one half of the enclosure are observable the upper module framed by underground cover 17 is appreciated as are middle module 2 and lower module 3 the front and rear covers 19 and 19 u2032 which are retractable and the lower 22 and middle 23 beam from the middle module 2 as well as ribs or intermediate sections 24 and the foil material covering the space delimited by the beams.