Page 38 - Industrial Plant 2020
P. 38

Picture 23



                             loads imposed on the hydraulic system from the   remaining  “V”  shape  piles,  were  lowered  by  Fagioli
                             concrete structure equal to 2400 tons per tower pair. In   strand jacking system and Fagioli cantilever beam
                             order to increase precision and constantly monitor the   which was designed to distribute the loads onto the
                             load transmitted to the reinforced concrete structure a   pile in an isostatic and uniform manner, able to
                             reading system with Fagioli load cells was also adopted,   perfectly transfer the 250 ton load of each of the 2
                             with an accuracy of 0.5%, with readings H24, 7 days a   strand jacks onto the No. 3 beams of the pile. It is
                             week. The system was mounted at the base of each   worth pointing out that each of the auxiliary metal
                             jack. The securing activity of the piles allowed the   structural element was designed in such a way that the
                             lowering and removal operation of  Berger beam  11   load transferred to each concrete structure, was
                             (760 ton). Picture 24                     applied “by support”, that is by contact, and not “by
                             A specific and deep analysis of the eventual   traction”. The Berger beam before the lowering
                             deformations of the berger beams during lowering   operation,  was  cut  and  lifted,  in  order  to  allow  the
                             operation was constantly carried out. The berger   removal of the structure which supported the road
         Picture 24          beams on the Western side, supported by the   surface  (drawing in picture 25)
                                                                       The lifting of the Berger beam was carried out by
                                                                       means of a metal structural beam which supported the
                                                                       floor from below, by contact. (Picture 26)


                                                                       This action increased safety

                                                                       on site

                                                                       For what concerns the disassembly of the piles, this
                                                                       activity was carried out by making longitudinal cuts in
                                                                       the concrete structure, about 36 m long with thickness
                                                                       up to  3 m. The whole concrete structure was divided
                                                                       into no.3 large blocks with a weight suitable for lifting
                                                                       by means of two Fagioli Demag CC-2800 crawler
                                                                       cranes, in SSL configuration, with 78m boom, Superlift
                                                                       300 ton at 13m (See picture 27)
                                                                       The rigging system, consisting of two hooks and wire
                                                                       ropes on the hook, was designed in such a way that
                                                                       the concrete structure was supported from below, in
                                                                       strategic positions, so that the bending moment in the

            IndustrIal Plants - May 2020
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