Prestressed UHPC shell-concrete inner core combined cover beam structure and construction method thereof

Abstract

The invention discloses a prestressed UHPC shell-concrete inner core combined cover beam structure which comprises a cover beam shell, the cover beam shell comprises webs and a bottom plate, multiple webs are connected to the bottom plate, an inner cavity with an upward opening is defined by the webs and the bottom plate, the cover beam shell is a prefabricated UHPC shell, a plurality of reinforcing frames are vertically arranged in the inner cavity, multiple reinforcing frames are arranged in the length direction of the bent cap shell at intervals, and the inner cavity is filled with common concrete inner cores in a pouring mode. The structure has the advantages of being low in self weight, good in durability and high in bearing capacity.

Description

technical field [0001] The invention relates to the field of bridge engineering, in particular to a prestressed UHPC shell-concrete core composite cap beam structure and a construction method thereof. Background technique [0002] The cap beam is an important component of the bridge structure, connecting the upper and lower structures of the bridge. The dead load, live load and other functions borne by the superstructure are transmitted to the cover beam through the support, and the cover beam then transmits these loads to the pier and foundation. The technical requirements of the cover beam are mainly bearing capacity and applicability. The bearing capacity means that under extreme conditions, such as the bridge deck is full of vehicles, earthquakes, car impacts, etc., it will not be damaged. The applicability means that the cover beam will not be damaged during normal use. There is too much deformation, and there will not be too many cracks that are too large. In additio...

AI Technical Summary

Problems solved by technology

The rigidity of the solid section is high, the deformation of the end of the cantilever of the cover beam is small, and the driving is comfortable, while the rigidity of the hollow section is reduced, and the deformation of the end of the cantilever is large, and certain measures need to be taken to control the deformation, which increases the cost

In addition, the steel plate on the top of the cover beam is exposed, requiring a lot of maintenance costs

[0006] The existing fully prefabricated light-duty large cantilever pre-bent composite cover beam structure (authorized announcement number: CN212426706U) adopts a steel-concrete composite structure, and the steel box girder is used as a stiff skeleton, so the bearing capacity of the cover beam is greatly improved, but its construction is very difficult. Inconvenient, still need to set up brackets and formwork on site, does not conform to the trend of "green and environmental protection"

In addition, although the foam concrete and lightweight concrete filled inside reduce the self-weight of the cap girder, most of the weight of the cap girder is transmitted from the bridge deck. more material cost

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