Prestressed Beam Structure and Setting Method of Small and Medium Span Prefabricated Concrete Girder Bridge

Abstract

The invention provides a small and medium-sized span precast concrete girder bridge pre-stressed tendon structure and an arrangement method thereof and aims to solve the problems in the prior art that the precast concrete girder bridge is apt to have cracks, accordingly the transverse connection strength and rigidity of small box girders or T-shaped girders are reduced, and the service life and the safe performance of the precast concrete girder bridge are severely affected. Longitudinal pre-stressed tendons are arranged on two sides of the same group of small box girders or T-shaped girders or at the bottom of each small box girders or T-shaped girder. Two pre-stressed tendons intersected to form an X shape are arranged on two sides of a wet joint of every two adjacent small box girders or T-shaped girders, namely one end of a first pre-stressed tendon is arranged at the root of a wing plate of each small box girders or T-shaped girder. A second pre-stressed tendon is symmetrical to the first pre-stressed tendon in the reverse direction. The small and medium-sized span precast concrete girder bridge pre-stressed tendon structure and the arrangement method thereof have the advantages of effectively improving the transverse connection strength and rigidity of the small box girders or the T-shaped girders, improving the whole stress performance of the precast concrete girder bridge, ensuring the long-term stability and service safety of the bridges and having good social and economic benefit.

Description

field of invention [0001] The invention relates to a technology for arranging prestressed bundles of prefabricated concrete girder bridges with medium and small spans, in particular to a structure of prestressed bundles for prefabricated concrete girder bridges with small and medium spans and a setting method thereof. Background technique [0002] With the vigorous development of bridge construction in our country, the structural forms of bridges have become more abundant. However, for highway bridges, urban bridges and railway bridges with small and medium spans, most of them still use reinforced concrete beams or prestressed concrete beam structures. Among them, prefabricated concrete girder bridges with small and medium spans can well meet the requirements of high-grade bridges due to their large section torsional strength and flexural strength, reasonable bending stress graph, small shear stress and good stability. High-speed, stable and comfortable road driving is requ...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the existing precast concrete girder bridges that are prone to cracks, resulting in the reduction of the transverse connection strength and stiffness of small box girders or T girders, seriously affecting the service life and safety performance of precast concrete girder bridges, etc., the present invention proposes a Prestressed Beam Structure and Setting Method of Small and Medium Span Prefabricated Concrete Girder Bridge

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