Reinforced concrete arch bridge construction method combined with cast-in-place cantilever method and stiff skeleton method

Abstract

The invention discloses a reinforced concrete arch bridge construction method combined with a cast-in-place cantilever method and a stiff skeleton method. The reinforced concrete arch bridge construction method is characterized by comprising the following steps that (1) the cast-in-place cantilever method is used for pouring arc ring sections in left-right symmetry and segmentation modes, the length of the arc ring sections formed by the cast-in-place cantilever method is 1 / 2-3 / 4 of the full length of an arch ring, the weight of each section is not larger than 200 tons, and after the previous section is hardened for 7-10 days, the next section begins to be poured; (2) the arc ring sections with the tops opened are formed in the step (1), stiff skeletons are erected at the openings, and the two ends of each stiff skeleton are connected with the adjacent left arc ring section and the right arc ring section respectively; (3) stiff skeleton section concrete is poured in a segmentation mode, the stiff skeletons are wrapped in the concrete, and accordingly the entire arch ring is formed. According to the construction method, a long-span arch bridge of 200-400m can be constructed, and the cost can be saved.

Description

technical field [0001] The invention relates to a construction method of a reinforced concrete arch bridge combining cantilever pouring and stiff skeleton. Background technique [0002] The construction methods of reinforced concrete arch bridges mainly include bracket construction method, cable hoisting method, cantilever pouring method, swivel construction method, and stiff skeleton method. [0003] The cantilever pouring method is to use the abutment pier or build a temporary pier as the temporary support of the stay cable, use the temporary stay cable to buckle the poured arch ring segment, and use the mobile hanging basket to start symmetrical cantilever pouring from the arch foot to the arch ring Concrete until the vault is closed. The stiff skeleton method is to pour concrete in sections on the pre-formed truss arch skeleton, and finally form a reinforced concrete arch. [0004] Disadvantages: (1) The construction period of the support construction method is long, a...

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Problems solved by technology

[0004] Disadvantages: (1) The construction period of the support construction method is long, and the traffic under the bridge needs to be interrupted during the construction period; (2) The span of the arch bridge is limited by the cantilever pouring method due to the limited tension of the cable stays; (3) The construction of the stiff skeleton method The process is complex, the construction cost is high, and it is difficult to control the quality of concrete pouring; (4) The maximum span of reinforced concrete arch bridges constructed by cantilever pouring and other methods is about 200m, and the span of arch bridges constructed by the stiff skeleton method is generally about 400m. For arch bridges with a span of -400m, it is difficult to implement the cantilever pouring method, and the cost of the stiff skeleton method is too high

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