Closure structure of hybrid beam rigid frame bridge under strong surge condition and lowering, staggering and closing method

Abstract

The invention discloses a concrete beam closure structure of a hybrid beam rigid frame bridge under a strong surge condition. The concrete beam closure structure comprises a pair of reinforced concrete combination sections which are symmetrically arranged on two concrete beams to be closed, wherein the joints of the pair of reinforced concrete combination sections form a closure opening, and the lengths of a top plate, a web plate and a bottom plate of the joints of the reinforced concrete combination sections are sequentially increased along a longitudinal bridge direction, so that the sections of the joints along the longitudinal bridge direction are Z-shaped; a large-section steel box girder, wherein the relative positions of a top plate, a web plate and a bottom plate of the large-section steel box girder are matched with the pair of steel-concrete combined sections, and the lengths of the top plate, the web plate and the bottom plate of the large-section steel box girder along thelongitudinal bridge direction are sequentially decreased progressively, so that the sections at the two sides of the large-section steel box girder along the longitudinal bridge direction are Z-shaped. The invention further discloses a method for lowering, staggering and closing the large-section steel box girder of the hybrid beam rigid frame bridge under the strong surge condition. According tothe method, under the strong surge condition, the rapid and accurate closure of the large-section steel box girder can be achieved, and the width error of the weld joint of the closure is smaller than 1 cm.

Description

Technical field [0001] The invention relates to a bridge engineering construction technology under severe sea conditions. More specifically, the present invention relates to a closure structure of a mixed beam rigid frame bridge under strong swell conditions and a method for lowering and dislocation closure. Background technique [0002] The mixed-beam rigid frame bridge refers to the entire span of the girder body, where there are both concrete girder and steel box girder structures. Steel box girder is generally used in the mid-span part of large-segment steel box girder, which is beneficial to reduce the weight of the bridge, improve the bending moment of the bridge, and increase the span of the bridge. At present, in the design of mixed beam rigid frame bridges, the mid-span steel box girder mostly adopts the form of large sections, which is much longer than the length of the ordinary steel box girder closure section, and generally can reach more than 50m. [0003] Under norma...

AI Technical Summary

Problems solved by technology

However, under severe sea conditions, such as strong swell waves with a wave height exceeding 1m or even as high as 4-5m, the measuring instrument cannot observe the size change of the closing mouth, and the spatial attitude monitoring accuracy of the closing mouth is low. Shaking, the shaking amplitude exceeds 2cm, and the displacement of the closing gap becomes the key factor affecting the precise closing of the steel box girder, which is far greater than the dimensional change caused by the temperature difference effect. It is impossible to measure the posture of the closing gap by traditional methods to determine the fitting and cutting accuracy of the large-segment steel box girder

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