Rapid repair method for three-stand-column structure bridge with damaged lateral stand columns and undamaged beam and slab structure

Abstract

The invention belongs to the technical field of traffic and municipal engineering, and discloses a rapid repair method for a three-stand-column structure bridge with damaged lateral stand columns and an undamaged beam and slab structure. For the three-stand-column structure bridge, when the stand columns on one or two sides are damaged, and the upper beam and slab structure is not damaged, the damaged stand columns and a capping beam on the lower portion of a beam and slab are directly replaced or repaired without dismantling the bridge beam and slab, and through temporarily supporting the capping beam, integrally jacking box girders, removing the damaged stand columns and the capping beam in a chiseling mode and pouring new stand columns and a new capping beam, conversion of a stress system is completed finally. According to the technical scheme, through counter-pressure unloading and temporary support erecting, the capping beam is primarily fixed, the stableness of the stress system of the whole bridge is ensured, then through designing an integral jacking system of the box girders, the new stand columns and the new capping beam are built and erected, and therefore stabilization and replacement of the whole stress system are completed. The scientific and reasonable construction scheme is made to ensure smooth progressing of projects.

Description

technical field [0001] The invention belongs to the technical field of traffic and municipal engineering, and in particular relates to a rapid repair method for the damaged beam-slab structure of a side column of a three-column structure bridge. Background technique [0002] Bridges are an important transportation infrastructure in my country's modernization drive. Due to human and natural factors such as repeated vehicle loads, explosion shocks, impacts, rainstorms, floods, strong winds, earthquakes, freeze-thaws, etc., it is inevitable that the bridge's use function and driving comfort will gradually degrade, and a large number of bridge diseases will appear. Collapse, causing traffic disruption and serious negative effects. [0003] Throughout the country and abroad, major accidents caused by bridges colliding with piers are not uncommon. In 1993, a cement tanker hit a bridge pier in Evergreen, Alabama, and caused part of the bridge to collapse; in 2004, a natural gas ac...

AI Technical Summary

Problems solved by technology

Due to the lack of awareness of the relevant safety risks by the construction personnel, the additional pressure brought by the large area of ​​surcharge is very likely to cause damage to the existing bridge structure

Especially for high-pier, pier-column bridges, due to their low transverse shear and bending stiffness, it is easy to cause damage or even collapse to the bridge

[0005] These accidents not only caused great economic losses, but more importantly, brought a lot of pressure to the already heavy traffic virtually.

Traffic diversion or traffic closure is easy to say, but it is often difficult to implement, because not only the repair cost is high, but also the construction period is too long. How to find the most reasonable and efficient solution? Specifically, for example, "for a bridge with a three-column structure, when the side columns are damaged and the beam-slab structure of the upper structure has not been damaged", can the damaged substructure columns and cover beams be directly replaced without demolishing the bridge to achieve What about a quick fix? This has always been a difficult problem that has puzzled people for a long time.

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