Concrete small box girder assembly type shear-resistant reinforcing device based on UHPC prefabricated slab and reinforcing method of device

Abstract

The invention relates to a concrete small box girder assembly type shear-resistant reinforcing device based on a UHPC prefabricated slab and a reinforcing method of the device. The concrete small box girder assembly type shear-resistant reinforcing device comprises the UHPC prefabricated slab assembled on the outer surface of a small box girder. A plurality of anchor bolt preformed holes are reserved in the outer surface of the UHPC prefabricated slab, correspondingly, anchor bolts corresponding to the anchor bolt preformed holes are pre-buried in the small box girder, and the anchor bolts are inserted into the anchor bolt preformed holes, fastened through bolts and used for attaching the UHPC prefabricated slab to the outer surface of the small box girder. The device and method have the advantages that the shear-resistant reinforcing method of the small box girder through the enlarged section method and the excellent performance of the UHPC material are integrated, from the aspect of assembly, factory prefabrication and high-temperature steam curing are adopted for the newly-added thick UHPC prefabricated slab, on-site pouring and concrete curing are avoided, and the performance of the UHPC material can be fully guaranteed; and after reinforcement, the problem of later durability is avoided, and maintenance-free after reinforcement can be achieved.

Description

technical field [0001] The invention belongs to the technical field of bridge maintenance and reinforcement devices, and in particular relates to an assembled type shear reinforcement device for small concrete box girders based on UHPC prefabricated slabs and a reinforcement method thereof. Background technique [0002] Thanks to the advantages of high torsional rigidity, low girder height, and clear structural stress, concrete small box girder bridges are widely used in small and medium-span bridges. However, due to poor control of web thickness and overloading of vehicles, small box girder bridges often have oblique web shear cracks, which lead to a decrease in shear bearing capacity and affect structural safety. The shear reinforcement methods of small box girders can choose to paste steel plates, increase the cross-section of concrete, and paste composite materials, etc., but these reinforcement methods also have certain problems. For example, there are often steel plate...

AI Technical Summary

Problems solved by technology

However, since UHPC construction is relatively harsh on health conditions, it is often difficult to achieve the expected reinforcement effect when using it for shear reinforcement of bridges directly by increasing the cross-section of cast-in-place concrete.

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