The invention discloses a large-span capping beam
prefabrication and
assembly method and a large-span capping beam; according to the large-span capping beam
prefabrication and
assembly method, overall no-bracket construction of the large-span capping beam is carried out by adopting staged prefabricated
casting on the whole and gradually tensioning steel beams in all stages; the method comprises the stages of S1, prefabricating a U-
shaped beam component as a bottom die; forming a U-shaped
rabbet in the U-
shaped beam component, and tensioning at least four prestressed steel beams on the U-
shaped beam component for reserving porous channels for subsequent prestressed tensioning; S2, after the U-shaped beam component is hoisted in place,
casting a hollow part of the U-shaped
rabbet in a way of cast-in-situ, and correspondingly tensioning at least six prestressed steel beams for reserving porous channels for subsequent prestressed tensioning; S3,
casting the rest part of a cross section of the
lower half part of the beam component in a way of cast-in-situ, and correspondingly tensioning at least ten prestressed steel beams; S4, completing the construction. After the large-span capping beam
prefabrication and
assembly method is adopted, not only is the construction efficiency high, but the traffic pressure is also greatly reduced. Furthermore, compared with the existing construction method, the large-span capping beam prefabrication and assembly method is also very environment-friendly.