Railway bridge
One project, many concrete advantages.
Works: Railway Flyover
Location: Lesignana (RO)
Project features: this flyover is located along the Modena stretch of the high speed railway line. Most of the works over the length were done using pre-fabricated modules adapted to the distance between the piers of approximately 30 m. The new project needs and an increased distance between the piers of approx. 56 m due to the passage of another railway line made it necessary to cast in-situ. The formwork supplied to build the superstructure was designed using the MECCANO 120 system, assembled to build segments of 56 m length. One single module was 5m long and 8.5 m high and served as tower support for the bottom formwork. The side formwork was fixed to the bottom formwork, built using a MECCANO 120 truss structure, designed specially and shaped to suit the particular "U" shape of the superstructure. The lateral formwork was built of MECCANO 180 framework shaped with polystyrene inserts to obtain the required texture. With a total length of 136 m, a carriageway was cast in three phases. To striking the internal formwork, it was lifted by the crane using a lifting beam. The external formwork was anchored using tie rods to the cast and prestressed bridge. Having eliminated the MECCANO 120 towers, the whole formwork was removed with the formwork truss in a single manoeuvre, lowering it vertically and reusing the modules sequentially in the next phase. All the movements, positioning and removal operations were assisted by ALPI staff; the company supplied its equipment in position and ready for casting. After a careful analysis of the project, ALPI proposed propping from below, with a minimal number of support points, which brought clear economic advantages. The rental equipment consisted mainly of products from the MECCANO standard range, which the contractor also reused for a new worksite for a bridge with the same section, saving time and reducing costs.