Bridge widening structure and construction method thereof

Abstract

The invention relates to a bridge widening structure and a construction method thereof.The bridge widening structure structurally comprises a new bridge girder used for widening an old bridge girder and a new bridge abutment used for supporting the new bridge girder, and the new bridge girder comprises a prefabricated top plate connected to the upper surface of the new bridge abutment and a second post-cast strip connected between the prefabricated top plate and the old bridge girder; the upper surface of the prefabricated top plate, the upper surface of the second post-cast strip and the upper surface of the old bridge girder are flush; the construction method comprises the steps of (1) measuring data of an old bridge and manufacturing the first formwork of the positioning wall on the new bridge, (2) pouring the prefabricated top plate and the positioning wall, (3) installing the supporting assembly, (4) installing the prefabricated top plate, (5) pouring the first post-pouring strip and (6) pouring the second post-pouring strip.

Description

technical field [0001] The present application relates to the field of bridge construction, in particular to a bridge widening structure and a construction method thereof. Background technique [0002] At present, the traffic volume is increasing day by day, and the roads built in the early stage cannot bear the increasing traffic pressure. Therefore, in order to improve the operation capacity of the roads, more and more road and bridge reconstruction and widening projects are put on the agenda. [0003] Due to the long construction period of on-site pouring construction, not only the construction cost is high, but also the impact on traffic operation is also large. Therefore, the road reconstruction and bridge project often adopts the method of prefabrication, that is, precasting the prefabricated bridges that match the size of the old bridge in advance. The new bridge will then be fixed on the old bridge by planting reinforcement at the construction site, and then grouting...

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Problems solved by technology

[0004] In view of the related technologies mentioned above, the inventor found that in the process of installing the prefabricated new bridge, it is necessary to connect the old and new main girders with planted reinforcement, and to match and connect with the preset holes opened on the old bridge, and then reinstall the old and new main girders. Pour concrete between them to fix them, and it is easy to cause deviations between the steel bars and the preset holes, concrete settlement and other risks, resulting in the risk of misplaced faults between the old bridge and the new bridge, and uneven roads on the bridge after installation. The staff made adjustments and corrections in the later stage, and there was a defect that it took a long time during the bridge widening construction process

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