Assembling type sectional precast concrete hollow plate girder structure and manufacturing method thereof

Abstract

The invention discloses an assembling type sectional precast concrete hollow plate girder structure and a manufacturing method thereof. The assembling type sectional precast concrete hollow plate girder structure comprises top plates and U girders, which are connected to formed a plate girder structure, wherein the top plates and the U girders are made through casting concrete and are respectively formed by splicing a plurality of sections in the longitudinal direction; shear keys are arranged on the outer surfaces and the longitudinal cross sections of webs of the U girders and on the longitudinal cross section of the top plates in a matching and precast manner; the plate girder structure is provided with longitudinal pre-stressed tendons and horizontal pre-stressed tendons, and epoxy resins are applied to interfaces of spliced seams. Compared with a conventional plate girder structure, the plate girder structure disclosed by the invention has the advantages that hinged joint damage is avoided, the bridge completeness of the hollow plate girders is improved, longitudinal cracks generated in bottom plates are avoided, transportation and hoisting are facilitated, the coming off of inner molds of the hollow plate girders are facilitated through U-shaped section, the strength of seams is improved, the cast-in-situ construction quantity is small, mechanized effect is facilitated, influence on environment and ground traffic is small, construction cost is reduced, and the construction period is shortened.

Description

technical field [0001] The invention relates to an assembled segmental prefabricated concrete hollow slab beam structure and a manufacturing method thereof, belonging to the field of civil engineering bridge superstructures. Background technique [0002] At present, there are mainly three types of damage in the upper structure of prestressed concrete hollow slab beams: transverse cracks in the bottom slab, longitudinal cracks in the bottom slab, and hinge joints. And hinged joint disease, its deep-seated damage mechanism is still unclear, and there has been no substantial breakthrough in prevention and control measures. [0003] The longitudinal cracks of the bottom plate generally appear along the direction of the prestressed tendons, and once they appear, most of their lengths are greater than 1 / 3l, where l is the span of the beam. The current research shows that the longitudinal cracks in the bottom slab mainly have the following causes: premature prestress release, Pois...

AI Technical Summary

Problems solved by technology

[0010] Aiming at the deficiencies of the prior art, the present invention provides a new type of prestressed concrete hollow slab beam structure to solve the problem of excessive self-weight of the existing prestressed concrete hollow slab beam, difficulty in erection, inconvenient transportation, difficulty in dismantling and removal of the inner formwork, and easy longitudinal appearance. Water seepage and whitening of cracks, joints, and poor integrity

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