Steel box plate-girder mixed bridge suitable for mountainous conditions

Abstract

The invention relates to a steel box plate-girder mixed bridge suitable for mountainous conditions. On the basis of the effective optimization for a structure form of a cross section of a girder and the promotion for a mechanical performance of a steel girder, the structure dead load is reduced, the economical efficiency of the structure is increased, the transportation and construction difficulties of the steel girder are reduced and the guaranteeing for the construction quality of the steel girder is benefited. The steel box plate-girder mixed bridge comprises the steel girder and a bridge deck slab fixedly arranged on the steel girder, wherein the steel girder comprises two opening rib steel box girders and at least one inverted T-shaped steel plate girder; the opening rib steel box girders are respectively located on one side of the transverse direction of the bridge; the inverted T-shaped steel plate girder is located between the two opening rib steel box girders; the opening rib steel box girders and the inverted T-shaped steel plate girder are integrally connected and form into a mixed steel girder structure; a steel-concrete combined bridge deck slab is formed by a steel bridge deck slab and a cast-in-situ deck concrete slab; the steel bridge deck slab is welded at the top ends of the opening rib steel box girders and the inverted T-shaped steel plate girder; shear connectors are distributed on the steel bridge deck slab; the cast-in-situ deck concrete slab is formed by the cast-in-situ concrete on the steel bridge deck slab.

Description

technical field [0001] The invention relates to a steel structure bridge, in particular to a steel box plate girder mixed girder bridge suitable for mountain conditions. [0002] technical background [0003] In the construction of steel structure bridges, the amount of steel used is an important indicator of the economy of steel structure bridges. Under the premise of not affecting the safety of the structure, the amount of steel used can be reduced by optimizing the layout of the cross-section, and at the same time, the stress of the layout of the cross-section should be optimized. More reasonable and lightweight. At the same time, in order to facilitate construction and improve construction accuracy, the structural measures and construction techniques of the cross section should be optimized as much as possible. At present, steel box girders or I-shaped steel plate girders are generally used as cross-sectional forms of highway steel structure bridges. [0004] In mountai...

AI Technical Summary

Problems solved by technology

The traditional I-shaped steel plate girder bridge has low lateral stiffness, poor lateral mechanical performance, and many sections for transportation and hoisting; the torsional stiffness and lateral bending stiffness of the traditional steel box girder bridge are large, but the box chamber near the middle of the cross section is opposite to the The force contribution of the entire cross-section is not large, and it will increase the difficulty and cost of construction. The high steel consumption is poor and the economy is poor. The box chamber section of the traditional steel box girder is relatively large, and it is relatively difficult to manufacture, transport, install and erect. Adapt to the engineering conditions of large bridge width changes and poor transportation conditions in mountainous areas; traditional I-shaped steel plate girder bridges and steel box girder bridges use concrete bridge decks, and the concrete bridge decks and main girders are connected by cast-in-place joints, ensuring structural integrity Poor, and the installation of the bridge deck and the construction of the cast-in-place joints are relatively cumbersome

Images