A method for improving the overall stress of prefabricated oblique prestressed hollow slab girder bridge

Abstract

The invention discloses a method for enhancing overall stress on an assembled type heterotropic pre-stress hollow slab beam bridge. An existing assembled type heterotropic pre-stress hollow slab beam is higher in bend-twist coupling and larger in cross section buckling deformation, and connection parts of hinge joints are easy to crack and break. Five diaphragms perpendicular to the axial line of the bridge are arranged at a halving point, quartiles and obtuse angle positions of a span of the assembled type heterotropic pre-stress hollow slab beam; pre-stress pipelines are pre-buried into the diaphragms for bridge transverse direction pre-stress tensioning, and upper and lower layers of longitudinal and transverse structural steel bars for bridge deck pavement are additionally assembled. According to the method, deformation of the section of a hollow slab can be resisted, buckling of the section is suppressed, the anti-torsion capacity of the section of the hollow slab is improved, the integrality of the prefabricated assembled type heterotropic pre-stress hollow slab beam is greatly enhanced, and the durability and the bearing capacity of the structure are improved. The construction method is simple and practical, and has obvious economical technical benefits.

Description

technical field [0001] The invention belongs to the technical field of bridge engineering, and in particular relates to a method for increasing the overall stress of an assembled oblique prestressed hollow slab girder bridge. Background technique [0002] In order to meet the requirements of highway alignment, there are a considerable number of skew bridges in our country's highway bridges. Due to the existence of the inclination, the mechanical characteristics of the inclined bridge are different from those of the main bridge. The force analysis, structural design and construction of skew bridges are quite complex. For the existing prefabricated oblique prestressed hollow slab girder bridges, the transverse bending moments and loads of the bridge tend to be transmitted to the obtuse angle of the shortest path, resulting in the combined flexural-shear-torsional force of this type of bridge. The lateral bending moment of the skew bridge is much larger than that of the ortho...

AI Technical Summary

Problems solved by technology

The lateral bending moment of the skew bridge is much larger than that of the orthogonal bridge with the same span. Under the action of the vehicle load, large repeated tension, compression and shear forces are alternately generated in the hinge joints between the plate girders, resulting in hinged concrete Cracking and spalling, along the longitudinal hinge of the bridge or longitudinal cracks appear at the bottom of the slab girder, and gradually reflect to the pavement layer of the bridge deck, etc., resulting in a decrease in the transverse stiffness of the bridge and the deterioration of the overall mechanical performance

In addition, the digging rate of the hollow plate section is relatively large, its bending and torsion coupling effect, warping deformation is large, the section is prone to deformation, and the torsion resistance is weak

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