Prestressed concrete continuous beam bridge with small side-to-main span ratio, and construction method thereof

Abstract

The invention discloses a prestressed concrete continuous beam bridge with a small side-to-main span ratio, and a construction method thereof. According to the technical key point of the invention, the structure system is not provided with a side span folding section, a side pier tension-compression support is arranged on a side pier, and the side-to-main span ratio is relatively small and is 0.5 to 0.55; the side span is configured with a reasonable side span full-length prestressed reinforcement, and the side span is provided with a side span permanent counterweight section. During construction, temporary counterweight is applied to the side span to finish main span folding; system conversion is finished, temporary counterweight is applied to the main span reasonably, and the side span is continuously subjected to suspended pouring; the side pier tension-compression support is arranged on the side span and the side pier, counterweight concrete is poured in a side span box beam near the side pier, and construction of the side span and the full bridge is finished. Through reasonable structural design scheme, the conventional side span cast-in-situ section and the side span folding section are canceled, the construction method is suitable for the prestressed concrete continuous beam bridge which is inconvenient in side span bracket erection, and new design thought is provided for solving the construction problem of a large-span prestressed concrete continuous beam bridge.

Description

technical field [0001] The invention belongs to the technical field of prestressed concrete continuous girder bridges, and in particular relates to a prestressed concrete continuous girder bridge with a small side main span ratio and a construction method thereof. Background technique [0002] Prestressed concrete continuous girder bridges are widely used in bridge projects that have been built or are under construction in my country because of their clear structural stress, large spanning capacity, comfortable driving, low cost, and applicable to various construction methods. [0003] At present, the maximum span of long-span prestressed concrete continuous girder bridges has exceeded 150m, and the symmetrical cantilever method is generally used for construction. The side-to-main-span ratio is generally 0.6 to 0.8. Across collapsed segments. [0004] At present, the construction process of long-span prestressed concrete continuous girder bridges is as follows: (1) first co...

AI Technical Summary

Problems solved by technology

[0005] For bridges in mountainous areas or deep-water areas across rivers and rivers, it is difficult to erect supports or brackets for side-span cast-in-place sections, and it is extremely inconvenient to preload and dismantle supports.

The risk of scaffold construction is relatively high, and engineering cases of excessive deformation or even collapse are not uncommon

In addition, the closing section of the side span needs to be closed after

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