Trezzano sul Naviglio (MI) – 1969
Architecture: Giorgio Pugliese
Structures: Aldo Favini
Contractor: Coop. Lavoranti e Muratori, Milan
Prefabrication: ASTORI S.p.A., Milan
Client: MAX MARKET S.p.A.
Hangar with a total area of 83.3 m in four spans of 17.55 x 122.85 m and seven spans of 17.55 m with lateral overhangs of 7.5 and 5 m, made with prefabricated parts and brick infill.
Thin vault roofing elements in prestressed reinforced concrete with stiffening plate resting on the structure of beams and pillars.
«…The particular character of the system consists in having utilized, for the sequence of the beams, a statically determined system composed of beams that unless there is an overhang support the next beam, as shown in the illustration. Three types of beams are used in the roof:
– type A with a length of 25.05 m and two overhangs, one of 2.5 m, the other of 5 m (multiples of the width of the roofing part, which is 2.5 m) and a central segment of 17.55 meters;
– type B, intermediate (the type repeated the greatest number of times) with length of 17.55 m of which 2.5 m of overhang;
– type C, terminal, with a length of 22.5 m, of which 7.5 m of overhang.
The connection between beams and pillars is done by means of a sturdy steel drainpipe incorporated in the pillar itself, that crosses the whole beam. Later, however, another solution was used, i.e. to connect the pillar to the beam by means of four steel tie-rods, to still arrange the cables on the axis of the beam, one on the next over the same vertical, splitting the drainpipe at the position of the pillars and not wrapping the drainpipe itself with the cables. This method reduced the friction of the cables, because in planimetric terms they were thus above a vertical axial plane and the beam-pillar connection took on greater stiffness.
The advantage of the stiffness of the beam-pillar connection proved very effective during the assembly of the roofing segments, because the load of the beam was always asymmetric: in fact, the crane, which proceeded span by span, backed up as the roof advanced, in the same span, and could not cover the adjacent span until it had completed the one it was occupying. In this way, the central beams were also loaded, though temporarily, in an asymmetrical way.»
From “L’industria italiana del cemento”, 1970.
• Copertura in c.a.p. per un fabbricato industriale a Trezzano sul Naviglio, in “L’industria italiana del cemento”, n. 9, 1970;
• Nuove forme in cemento armato precompresso, in “Domus”, n. 474, 1969.