Large-span concrete-filled steel tube tied bar arch bridge construction method

Abstract

The invention discloses a large-span concrete-filled steel tube tied bar arch bridge construction method and relates to a concrete-filled steel tube tied bar arch bridge construction method, thereby solving problems of long bracket occupation time and the like caused by the existing pre-built bracket assembling method. An arch springing and a continuous beam block 0 are constructed together, and the 2 / 3 of the length of an arch rib of a section 1 is pre-buried in the arch springing; concrete is poured into a first-section arch rib steel tube; and a first arch rib is firmly welded to a temporary support. A bridge deck girder is constructed and a lower anchor box is pre-buried at a corresponding position of a suspender; and construction from the inside to the two ends is simultaneously carried out according to the sequence of erecting a next support and installing a next section of arch rib. For a closure section, the arc rib on the right side of the closure section is closed and then the arc rib on the left side of the closure section is closed and temporary fixation is performed. The seams between the adjacent sections of arch ribs are welded and fixed; arch rib concrete pouring iscarried out; the support is removed; the suspender is mounted; the suspender is expanded; and steel structure finish paint coating is carried out. The method has the advantages of high construction speed, support proceeding along with the installation progress and sufficient on-bridge operation space.

Description

Technical field: [0001] The invention relates to a construction method of a steel pipe concrete tied arch bridge, in particular to a construction method of a steel pipe concrete tie arch bridge with a span of 150m. Background technique: [0002] Theoretical research and engineering application of concrete filled steel tube structures are becoming more and more in-depth and extensive in our country. When this structure is applied to arch bridges, it shows a great degree of superiority in terms of mechanical properties, construction, economy and aesthetics, which greatly promotes development of arch bridges. The construction methods of concrete-filled steel tube tied arch bridges mainly include cable hoisting method, horizontal ( vertical) rotation construction method, and pre-assembled bracket assembly method. The cable hoisting method needs to arrange cable towers at the bridge head and the bridge tail, and set up cables between the two cable towers, and the cost of this me...

AI Technical Summary

Problems solved by technology

Recently, a lot of pre-assembled bracket assembly methods are used. Most of the brackets are erected at one time, and then the arch ribs are installed. This will cause the brackets to take a long time and increase costs. In addition, the brackets will affect the hoisting of the arch ribs, increasing the cost. big security risk

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