Modular Longitudinal System for Bridge Decks for Double-Track Railways

Abstract

A longitudinal modular system with boards ( 3 ) for underpass bridges for installation of two tracks for railway circulation in which the board ( 3 ) is placed between two consecutive piers ( 4 ) and comprises a pair of longitudinal beams ( 1 ), which themselves comprise a lower wing ( 2 c ), for supporting on the piers ( 4 ), a core ( 1 b ) and an upper wing ( 1 a ); and a plurality of transversal slabs ( 2 ) that are attached to the lower wings ( 2 c ) of the longitudinal beams ( 1 ), thus forming a U-shaped configuration, where the length of the longitudinal beams ( 1 ) is essentially similar to the span between two piers ( 4 ), and the configuration of the board ( 3 ) has a transversal, U-shaped section such that the railway circulates inside said U shape. The invention also describes the method for constructing same.

1 . A longitudinal modular system by means of a plurality of decks of bridges for an installation of a double-track for a circulation of railways, wherein the at least one deck is located between two consecutive piers and comprises:
 a pair of longitudinal beams comprising a bottom flange intended to be the support on the piers, a web intended to raise the structure of the deck, and an upper flange designed to accommodate an additional structure   a plurality of transverse slabs intended to be fixed by their ends on the bottom flanges of the pair of longitudinal beams, which support as a base on the piers, to achieve a configuration shape of a “U”,   
        where:
 the length of the pair of longitudinal beams is substantially similar to the span between two piers, 
 the configuration of the at least one deck has a “U” cross section that houses the double-track or the circulation of railways inside the “U” shape, 
 the transverse slabs are firmly fixed to the pair of longitudinal beams, and 
 the transverse slabs are firmly fixed to each other, creating a monolithic slab, 
 
        so that the whole at least one deck forms a monolithic structure with a transverse section with the shape of a “U” 
     
     
         2 . The longitudinal modular system by means of the plurality of decks of bridges for the installation of the double-track for the circulation of railways, according to  claim 1 , wherein between one of the two consecutive piers and the at least one deck there is a definitive bearing to avoid direct contact between the two elements. 
     
     
         3 . The longitudinal modular system by means of the plurality of decks of bridges for the installation of the double-track for the circulation of railways, according to  claim 1 , wherein a provisional bearing is located between one of the two consecutive piers and a board for the levelling of the pair of longitudinal beams to avoid their overturning. 
     
     
         4 . A construction method of the longitudinal modular system described in  claim 1 , comprising the following phases:
 a) manufacturing the pair of longitudinal beams and the plurality of transverse slabs,   b) transporting the pair of longitudinal beams to the two consecutive piers on which they will be located,   c) lifting and placing a first longitudinal beam on the two consecutive piers,   d) lifting and placing a second longitudinal beam on the two consecutive piers,   e) transporting the plurality of transverse slabs to the two consecutive piers on which they will be located,   f) lifting and positioning the plurality of transverse slabs to complete the length of the pair of longitudinal beams,   g) fixating the plurality of transverse slabs to the pair of longitudinal beams.   
     
     
         5 . The construction method of the longitudinal modular system, according to  claim 4 , wherein after phase d) the method comprises the following phase:
 h) placing a bracing means for controlling a position of the pair of longitudinal beams both absolute, with respect to the two consecutive piers, and relative, with respect to themselves.