External transverse tension prestressing force device for regulating and controlling large-span continuous steel bridge post deflection

Abstract

The invention discloses an external yokobari prestressing device of later deflection regulation of a large-span continuous rigid frame bridge, which comprises an external prestressing bundle arrangedinside the main girdle box and anchored between two adjacent bridge piers, at least two transverse tension commutators and two deviation blocks, wherein the transverse tension commutators are arrangedon the bottom plate of the box girder, exert downward tension on the external prestressed bundle, and establish axis prestressing inside the external prestressing bundle; the deviation blocks are arranged on both sides of the transverse tension commutator and are fixed between the top plate and the bottom plate of the box girder; the external prestressing bundle passes through a cable hole on thedeviation block and is connected to the transverse tension commutators. The invention can be used for the later defection regulation of the large-span concrete bridge, needs only small vertical tension to achieve equal vertical prestressing effect, simplifies the artwork and tension device, reduces prestressing loss, and is easy for multi-regulation according to the bridge later deflection changes with convenient operations.

Description

technical field [0001] The invention belongs to the field of building structures and construction devices, and in particular relates to an external transverse tension prestressing device for late-stage deflection control of a long-span continuous steel bridge. Background technique [0002] Continuous steel bridges are currently one of the most commonly used types of long-span concrete bridges. They have the advantages of strong site adaptability, large spanning capacity, and low maintenance costs under normal circumstances. However, due to many complex reasons such as imperfect design theory, engineering quality and control variation, many long-span continuous steel bridges have been built with defects of excessive deflection in the later stage. For this reason, people have made various approaches It is considered that it is an effective method to adjust the late deflection of continuous steel bridges by applying external prestress. [0003] External prestressing technology...

AI Technical Summary

Problems solved by technology

This longitudinal tensioning technology requires large-tonnage tensioning equipment; the friction between the prestressed beam and the steering block will cause a large loss of prestressing force; the continuous steel bridge can only be tensioned in the main girder box, and the operation The space is limited, the construction process is complicated, and the technical requirements are high; as the deflection of the continuous steel structure bridge gradually increases in the later stage, it is difficult to implement the corresponding regulation of external prestressing multiple times in a timely manner

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