Construction method for splicing prefabricated segmental bridges

Abstract

A construction method for splicing prefabricated segmental bridges, includes the following steps: manufacturing prefabricated segments composed of pier-top segments and non-pier-top segments, with steel strands embedded in each, and non-pier-top segments further equipped with reserved holes; erecting the pier-top segments; lifting the corresponding non-pier-top segments and applying epoxy resin glue on the corresponding adhesive joint surface; threading the embedded steel strands from the previously erected prefabricated segment through the reserved holes of the non-pier-top segment about to be erected; completing the adhesion of the adhesive joint surface; tensioning the steel strands that have passed through the reserved holes before the adhesive joint surface epoxy resin glue sets; releasing the beam launching machinery; applying permanent prestress; injecting high-strength mortar into the corresponding reserved holes; repeating the previous steps until all prefabricated segments are assembled.

1 . A construction method for splicing prefabricated segmental bridges, wherein the prefabricated segmental bridge comprises a plurality of prefabricated segments, consisting of pier-top segments and non-pier-top segments distinct from the pier-top segments, characterized in that the construction method includes the following steps:
 S 1 , Manufacturing each prefabricated segment with steel strands embedded along their length direction, with the steel strands in any two adjacent prefabricated segments set in a staggered arrangement, and each non-pier-top segment also having reserved holes for the steel strands from the previously erected prefabricated segment to pass through, these reserved holes traversing the ends of the corresponding non-pier-top segment;   S 2 , Erecting the pier-top segment, installing it onto the pier;   S 3 , Using beam launching machinery to lift the corresponding non-pier-top segment to the predetermined assembly position, and applying epoxy resin glue on the corresponding adhesive joint surface;   S 4 , Threading the embedded steel strands from the previously erected prefabricated segment through the corresponding reserved holes in the non-pier-top segment about to be erected;   S 5 , Completing the adhesion of the adhesive joint surface using the beam launching machinery;   S 6 , Tensioning the steel strands that have passed through the reserved holes using tensioning equipment before the adhesive joint surface epoxy resin glue sets, to achieve the design-allowed compressive stress, completing the temporary tensioning procedure;   S 7 , Releasing the beam launching machinery and moving it to the next construction point;   S 8 , Applying permanent prestress;   S 9 , Injecting high-strength mortar into the corresponding reserved holes, permanently embedding the steel strands within the corresponding prefabricated segments;   S 10 , Repeating steps S 3 -S 9  until all prefabricated segments are assembled.   
     
     
         2 . The construction method for splicing prefabricated segmental bridges according to  claim 1 , characterized in that, in step S 1 , steel strands are embedded within both the top and bottom plates of each prefabricated segment. 
     
     
         3 . The construction method for splicing prefabricated segmental bridges according to  claim 1 , characterized in that, in step S 1 , corrugated pipes are installed within the reserved holes. 
     
     
         4 . The construction method for splicing prefabricated segmental bridges according to  claim 1 , characterized in that, in step S 2 , after installing the pier-top segment onto the pier, the pier-top segment is temporarily or permanently fixed. 
     
     
         5 . The construction method for splicing prefabricated segmental bridges according to  claim 1 , characterized in that, the beam launching machinery is either a girder launcher or bridge building machine. 
     
     
         6 . The construction method for splicing prefabricated segmental bridges according to  claim 1 , characterized in that, the temporary prestress tensioned in step S 6  is designed and implemented according to the permanent prestress applied in step S 8 , serving as the permanent prestress reserve for the prefabricated segmental bridge.