A method for strengthening the lifting girder of double-track prefabricated box girder of high-speed railway

Abstract

The invention discloses a beam raising and reinforcing method for high-speed railway double-line prefabricated box girder. The method comprises the steps that external prestress is exerted between a top plate (6) and a bottom plate (7) of the box girder before raising of the prefabricated box girder, so that concrete at joints of the top plate (6) and web plates (8) of the box girder is in a pressed state before raising of the prefabricated box girder, and concrete at the joints is prevented from generating cracks when the prefabricated box girder is raised. The joints of the top plate and web plates of the box girder are subjected to the prestress before raising of the prefabricated box girder, so that the top plate and the bottom plate are pressed together, and the problem of cracking of the concrete at the joints of the top plate and the web plates of the box girder due to pulling is solved from the angle of structure stress.

Description

technical field [0001] This patent relates to the field of building structure and construction technology, and mainly relates to a high-speed railway double-line prefabricated prestressed concrete simply supported box girder, more specifically a method for strengthening the high-speed railway double-line prefabricated box girder lifting beam. Background technique [0002] In the process of high-speed railway construction, in order to minimize the occupied area and adapt to the terrain and geological conditions, bridges are often used. The proportion of bridges is generally high. The bridge structure is mainly prefabricated prestressed concrete simply supported box girder bridge. The prefabricated simply supported box girder needs to be lifted many times from manufacture to installation. At present, the double-line prefabricated simply supported box girder basically adopts a single box and single chamber structure. Lifting points are set on the top plate of the box girder for...

AI Technical Summary

Problems solved by technology

At present, the double-line prefabricated simply supported box girder basically adopts a single-box single-chamber structure. Lifting points are set on the top plate of the box girder for beam lifting operations. When lifting the beam, concrete cracks are prone to occur at the junction of the roof plate and the web plate, which affects the appearance and durability of the structure.

[0003] In view of the above problems, the existing technologies mostly adopt measures such as strengthening the control of the concrete cover and strengthening the configuration of steel bars, but the effect is not ideal, and the cracking of the concrete is still common when the beam is lifted

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