Highly seismic region prefabricated assembled bridge central pier stud-cover beam node pouring connection mode and construction

Abstract

The invention discloses a highly seismic region prefabricated assembled bridge central pier stud-cover beam node pouring connection mode and construction and belongs to the field of bridge engineering. The construction comprises a prefabricated pier stud and a prefabricated cover beam. The prefabricated pier stud and the prefabricated cover beam are connected into a bridge pier system through pouring of high-performance materials and splicing. The prefabricated pier stud is composed of a pier stud longitudinal bar, a pier stud stirrup, an overlap-joint large-diameter longitudinal bar, an overlap-joint stirrup and an inclined rebar jointly. The prefabricated cover beam comprises a grouting pipeline, a cover beam construction stirrup and a pouring inserting groove. The splicing quantity of the pier stud longitudinal bar is only a half or much less of the total quantity of longitudinal stressed rebars, and high-performance materials are adopted for pouring splicing. Small damage to a post-earthquake pier stud plastic hinge region is ensured while a large-diameter overlap joint longitudinal bar meets the bridge anti-seismic requirement in a highly seismic region. The bridge building speed can be increased greatly and construction convenience is improved greatly while the bridge anti-seismic requirement in the highly seismic region is met and construction quality is ensured, and a completely novel technical solution can be provided for prefabricated assembled bridge engineering application in the highly seismic region.

Description

technical field [0001] The invention relates to the field of bridge engineering, in particular to a pouring connection method and structure of a pier column-cover beam node in a prefabricated assembled bridge in a high-intensity area. Background technique [0002] my country is located between the circum-Pacific seismic belt and the Eurasian seismic belt, with frequent seismic activities. According to earthquake reports in recent decades, more serious earthquake disasters mostly occurred in western China, such as Wenchuan earthquake and Yushu earthquake. The western part of my country is mostly mountainous and hilly, with high mountains and steep slopes, complex terrain and high seismic intensity. Bridge structures are generally used when crossing river valleys or deep ditches. Due to the limitation of terrain conditions, the typical feature of continuous girder bridges is that the pier heights are very different, and they are irregular bridges. When an earthquake strikes,...

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Problems solved by technology

However, the increase in the reinforcement ratio will bring great construction difficulties to the commonly used grouting sleeves and grouting bellows, and will have a greater impact on the connection accuracy and quality of prefabricated assembled nodes, greatly reducing the cost of prefabricated assembled bridges. Its technical advantages, and more importantly, whether its seismic performance can be guaranteed. Now various industries and local standards stipulate that its application scope is in areas with seismic intensity not greater than 7 degrees.

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