Negative bending moment steel bundle tensioning connector and bridge construction for simply supported continuous bridge

Abstract

The invention discloses a steel bundle tensioning connector and a bridge structure of a simply-supported transformed continuous bridge with a negative bending moment. The steel bundle tensioning connector is directly embedded in the T-beam along the longitudinal direction of the T-beam and tensioned in the wet joint area between the T-beams so that the existing pier top negative bending moment area of the curve steel bundle into a straight bundle, reduce the pipe friction caused by the loss of prestress. On the one hand, it avoids the steel bar breaking in the T-beam, and greatly reduces the influence of the reserved tension groove on the bearing capacity of T-beam, while the tension groove transfers from the top of the precast T-beam wing to the wet joint area. On the other hand, the agedifference of concrete in and around the reserved tensioning groove is greatly shortened, and the shrinkage and creep stress of concrete due to age difference is greatly reduced. From the view of construction process, the construction procedure of tensioning steel bundle is adjusted from tensioning before anchoring to anchoring before tensioning, which eliminates the prestress loss caused by the retraction of anchorage.

Description

technical field [0001] The invention belongs to the field of bridge engineering, and in particular relates to a negative moment steel strand tension connector and a bridge structure of a simply supported variable continuous bridge. Background technique [0002] Prefabricated simply supported T-girder bridges are currently the most commonly used bridge type for small and medium-span concrete girder bridges. However, the shrinkage joints at the bridge deck will cause unevenness and discontinuity of the bridge deck. Some diseases occurred, so the bridge engineer proposed a new construction plan for the continuous deck of the simply supported beam bridge: wet joints were cast in place at the top of the pier, and after the concrete was cured to reach the design strength, the negative moment prestressed steel was tensioned by jacks. bundle, so that the concrete of the cast-in-place section on the top of the pier can reserve compressive stress to cope with the negative bending mome...

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Problems solved by technology

[0013] In view of this, the purpose of the present invention is to provide a simply supported variable continuous bridge negative moment steel beam tension connector and bridge stru...

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