Simply supported variable continuous bridge construction method with steel beam tensioning connector

Abstract

The invention discloses a simply supported variable continuous bridge construction method with a steel beam tensioning connector. The method includes the following steps that the steel beam tensioningconnector is pre-embedded in T-beams along the longitudinal direction of the T-beams, and tensions in a wet joint area between the T-beams; a curvilinear steel beam in the negative bending moment area of an existing pier top is transformed into a straight steel beam, which reduces the loss of prestress caused by the friction of a pipeline. However, a tensioning groove is transferred from the topof the prefabricated T-beam wing plate to the wet joint area, in the one hand, the disconnection of a reinforcing bar inside the T-beams is avoided, the impact of the reserved tensioning groove on thebearing capacity of the T-beams is greatly reduced; on the other hand, the difference of ages of concretes in and around the reserved tensioning groove is greatly shortened, and the concrete shrinkage and creep stress caused by age difference is greatly reduced. From the perspective of the construction process, the current construction procedure of steel beam tensioning is adjusted from 'tensioning before anchoring' to 'anchoring before tensioning', so that the prestress loss caused by anchorage retraction is eliminated.

Description

technical field [0001] The invention belongs to the field of bridge engineering, and in particular relates to a construction method of a simple-support variable-continuous bridge with steel bundle tension connectors. 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 moment under the ac...

AI Technical Summary

Problems solved by technology

[0013] In view of this, the object of the present invention is to provide a construction method of a simply supported variable continuous bridge with steel beam tension connectors. By improving the bridge structure and construction technology, it can overcome the current problems caused by the unreasonable construction form of the negative moment section. bridge quality problems

Images