Fabricated corrugated web steel box-UHPC composite beam bridge and construction method thereof

Abstract

The invention relates to a fabricated corrugated web steel box-UHPC composite beam bridge and a construction method thereof, the fabricated corrugated web steel box-UHPC composite beam bridge is composed of corrugated web steel boxes and UHPC bridge deck slabs, each corrugated web steel box is of an open box-shaped structure composed of a flat steel bottom plate, corrugated steel webs and a flat steel top plate, and the adjacent corrugated web steel boxes are connected through cross beams between the boxes; the UHPC bridge deck slabs comprise in-box prefabricated UHPC bridge deck slabs, inter-box prefabricated UHPC bridge deck slabs and cantilever cast-in-place UHPC bridge deck slabs, and the adjacent prefabricated UHPC bridge deck slabs are connected through cast-in-place wet joint UHPC bridge deck slabs; and the multiple UHPC bridge decks are correspondingly installed on the multiple corrugated web steel boxes to form the assembly type corrugated web steel box-UHPC composite beam bridge. According to the fabricated corrugated web steel box-concrete composite beam bridge, the steel consumption configuration is optimized, the self-weight of the structure is further reduced, the prefabricated concrete bridge deck is adopted, the fabricated degree is further improved, the construction period is short, the standardization degree is high, remarkable economic and social benefits areachieved, and the fabricated corrugated web steel box-concrete composite beam bridge has important significance in promoting large-scale application of steel structure bridges.

Description

technical field [0001] The invention belongs to the technical field of bridge engineering, and in particular relates to an assembled corrugated web steel box-UHPC composite girder bridge and a construction method. Background technique [0002] Corrugated web steel box-concrete composite girder bridges are a composite structure that has been widely used in recent years. Especially in long-span, ultra-wide and complex linear bridges, corrugated web steel box concrete composite girder bridges have obvious advantages. It is more reasonable, the material performance is fully utilized, and it adopts factory manufacturing and assembly construction, which can realize fine management and batch application, has good social and economic benefits, and has broad application prospects in highways and municipal bridges. [0003] Although traditional steel-concrete composite structure bridges solve the problems of concrete bridges such as easy cracking, poor durability, long construction pe...

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Problems solved by technology

[0003] Although traditional steel-concrete composite structure bridges solve the problems of concrete bridges such as easy cracking, poor durability, long construction period and short service life, they use a large amount of steel and have small stress reserves, which are affected by the low strength of concrete. When the span is large, the concrete bridge deck will be the weak link of the composite beam, especially at the midpoint of the continuous beam system, it is easy to crack, and the reliability of the bridge deck is affected

[0004] Traditional steel-concrete composite structure bridges usually use single-box multi-chamber steel box composite girders when the bridge deck width is large, which requires a large number of ribs to ensure the stability and connection strength of the steel plate parts, so the welding workload is huge , the cost and difficulty of quality control are increased, the fatigue strength is not easy to control, and the force of the multi-chamber structure is not clear, there are situations where the force on the side web is too large, and the force on the middle web is relatively small, resulting in the same room cannot supply materials on demand , it is difficult to achieve optimal design

[0005] In traditional steel-concrete composite structure bridges, the webs are mostly straight webs. Although the straight webs are easy to manufacture, when the beam height is large, the stability and shear buckling performance of the webs are difficult to guarantee, and a large amount of processing is required. Ribs and support measures, and the axial stiffness of the traditional straight-web composite box girder makes the prestress loss of the box girder larger, the prestress efficiency is not high, and it is difficult to give full play to the advantages of each material

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