Bridge erection method

Abstract

The invention discloses a bridge erection method, which is a prefabricated pier-top beam method. The bridge erection method comprises the following steps of: casting at least two pier columns at intervals; prefabricating pier-top beams, and arranging transverse prestressing tendons in the prefabricated pier-top beams; after the setting of concrete, tensioning the transverse prestressing tendons; arranging supports at the tops of piers, hoisting the pier-top beams, arranging the pier-top beams at the tops of the piers, and temporarily fixedly connecting the pier-top beams and the pier columns by using steel plates and reinforcing steel bars; erecting prefabricated longitudinal deck beams on the pier-top beams; casting in-situ concrete joint surfaces on the end faces of the longitudinal deck beams and the lateral surfaces of the pier-top beams, and casting in-situ early-strength and high-strength concrete in the joint surfaces; after the setting of the concrete in the joint surfaces, tensioning longitudinal prestressing tendons of the longitudinal beams; and removing the steel plates and the reinforcing steel bars. The method greatly reduces the height of a structural building and reduces the deck elevation; and a freely supported structure is changed into a continuous structure by the cast-in-situ concrete so as to improve the integrity of a bridge, prolong the service life of the bridge, solve the problem of stress in construction stages and reduce the cost of engineering construction.

Description

technical field [0001] The invention relates to a bridge erecting method, in particular to a simply supported and then continuous bridge erecting method. Background technique [0002] At present, when erecting overpass bridges in cities, two methods are generally adopted, one is simply supported first and then continuous structure, and the other is simply supported structure-bridge deck continuous structure. Compared with the simply supported structure-bridge deck continuous structure, it has no continuous bridge deck structure that is easy to be damaged, so it has many advantages such as good durability, good driving comfort, and little impact on surrounding noise. [0003] There are two ways to simply support first and then continue: [0004] 1. The simply supported beam is erected on the cover beam first and then continued. The defect of this construction method is that the pier cover girder is exposed, which not only affects the clearance under the bridge, but also aff...

AI Technical Summary

Problems solved by technology

The defect of this construction method: the bridge pier cover girder is exposed, which not only affects the clearance under the bridge, but also affects the beauty of the bridge

Defects of this construction method: high requirements for the stability of the support during the construction period, and the construction and removal of the temporary support is labor-intensive and material-intensive

At the same time, it is more difficult for the continuous beam to fall, and the safety is relatively poor

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