Large-span capping beam prefabrication and assembly method and large-span capping beam

Abstract

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.

Description

technical field [0001] The invention relates to the field of municipal bridge construction, in particular to a prefabricated and assembled method for a large-span cover beam and the large-span cover beam. Background technique [0002] In order to speed up the construction of modern cities, with the large-scale development of municipal projects, more and more attention has been paid to the impact of construction project quality, construction efficiency and traffic on construction sites. [0003] However, when the existing large-span cap beam is erected, it is necessary to build a temporary support on the auxiliary road below to repeat pouring concrete etc. due to starting from the erection. In this way, during the construction period, the following auxiliary roads will be restricted, which will not only cause traffic inconvenience, but also make the already congested urban traffic worse. [0004] Therefore, the erection of the existing large-span cap beams not only easily ca...

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Problems solved by technology

[0003] However, when the existing large-span cap beams are erected, it is necessary to build a temporary support on the auxiliary road below to reproduce the pouring of concrete, etc. from the beginning of erection.

In this way, during the construction period, the following auxiliary roads will be restricted, which will not only cause traffic inconvenience, but also make the already congested urban traffic worse.

[0004] Therefore, the erection of the existing large-span cap beams not only easily causes traffic jams at the construction site, but also the construction speed is slow (usually at least 1-2 months), so the construction period is long and the construction efficiency is low.

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