Reinforced concrete arch bridge with strong skeleton of steel tube concrete and construction method thereof

Abstract

The invention discloses a reinforced concrete arch bridge of a concrete filled steel tube stiff skeleton. The reinforced concrete arch bridge comprises a skewback. The skewback is connected to a stiff skeleton body which comprises an upper-chard steel tube and a lower-chard steel tube. The upper-chard steel tube and the lower-chard steel tube extend in the same direction and a plurality of web members are connected between the upper-chard steel tube and the lower-chard steel tube. The web members comprise the transverse web members parallel to the upper-chard steel tube. A *-shaped structure is formed by connecting the upper-chord steel tube and the web members of the lower-chord steel tube in a staggered mode. A segment of each web member is shortened, the rigidity and the strength are increased, and the reinforced concrete arch bridge has the advantages that the web members are more stable and the overall rigidity of the bridge is better.

Description

technical field [0001] The invention relates to a steel pipe concrete arch bridge and a construction method thereof, and is especially suitable for a steel pipe concrete arch bridge with a strong skeleton and a construction method thereof. Background technique [0002] The stiff skeleton construction method is mainly used in the construction of concrete arch bridges. During the construction process, reinforced concrete members (arch ribs) cannot bear their own weight and need to be borne by other members. The stiff skeleton is a method of adding steel pipes, I-beams or other steel materials to the reinforced concrete section to meet the construction conditions. [0003] In the existing reinforced concrete arch bridge, the structure of the stiff skeleton is as follows: figure 1 As shown, it includes upper chord steel pipes, lower chord steel pipes and several webs arranged in between. However, in the existing rigid frame, the webs are composed of several vertical or inclined...

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Problems solved by technology

[0003] In the existing reinforced concrete arch bridge, the structure of the stiff skeleton is as follows: figure 1 As shown, it includes upper chord steel pipes, lower chord steel pipes and several webs arranged in between. However, in the existing rigid frame, the webs are composed of several vertical or inclined to the upper chord steel pipes, along the extension of the upper chord steel pipes. The directions are connected head to tail in turn, and roughly arranged in an N shape. The disadvantages of this structure are: the overall rigidity is poor, and the stability of the web bar is poor.

[0004] In addition, the existing concrete-filled steel pipe is used as the arching skeleton of the reinforced concrete construction process. In order to save the amount of steel and reduce the steel consumption of the steel pipe skeleton as much as possible, after relying on the concrete-filled steel pipe skeleton to form an arch, the outsourcing concrete process is divided into multi-ring outsourcing to form an arch. Realization, that is, after each ring of outsourcing concrete is closed, it can participate in the overall force of the main arch and reduce the internal force of the steel tube concrete skeleton, so as to achieve the purpose of reducing the amount of steel. The disadvantage of this method is that the main arch has many outsourcing concrete links and dense construction joints , the process is complex, the final result is a long construction period, the quality of the construction joints cannot be guaranteed, and the risk is high. In addition, it also has the disadvantage that if the steel pipe specification and wall thickness are simply increased, the amount of materials needs to be increased, and the processing The manufacturing difficulty increases, and the installation and installation system are difficult at the same time, and the overall project cost increases

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