Advancing compensation type cable-stayed bridge overall cable-replacement equipment and cable-replacement method using equipment

Abstract

The invention discloses advancing compensation type cable-stayed bridge overall cable-replacement equipment and a cable-replacement method using the equipment. The equipment comprises an advancing system and a supporting compensation system; the supporting compensation system comprises a main truss, a main beam fixing device arranged on the main truss and a cable dismounting compensation device arranged on the main truss; and the advancing system comprises a fixed vertical crawling ladder, a movable vertical crawling ladder and a traction braking system. The method comprises the steps that (1) the supporting compensation system is moved to the position where cables need to be replaced; (2) the supporting compensation system and a main beam with the to-be-replaced cables are fixed; (3) cable replacement is implemented, and in the old cable graded cable-dismounting process, cable dismounting force is synchronously compensated through the cable dismounting compensation device; (4) fixing is removed; and (5) the steps are repeated till all the cables are replaced. According to the cable-replacement equipment, in cable replacement, base pressure stress of a concrete beam of a cable-replacement area is synchronously compensated and increased, the phenomenon that in the cable-replacement process, due to tensile stress, diseases occur to bottom edges is avoided, the safety degree is increased, and it is possible that the pull cables or the long cables in the area where cable-stayed bridge pressure reserve is small are replaced while traffic carrying is not affected.

Description

technical field [0001] The invention relates to the field of civil engineering bridges, in particular to the reinforcement and reconstruction of old bridges, and in particular to an integral cable replacement equipment for a traveling compensation type cable-stayed bridge and a cable replacement method using the equipment. Background technique [0002] Since the 1980s, with the development of engineering technology, a large number of concrete cable-stayed bridges have been built and put into use. Among them, the cable-stayed cables in the construction of cable-stayed bridges have a certain service life. The current "Technical Standards for Highway Engineering" stipulates that the design service life of cable-stayed cables is 20 years. In actual use, the service life of cable-stayed cables is between 15 and In 50 years, compared to the bridge's 100-year service life, each cable-stayed bridge needs to be replaced once or more times. [0003] At present, the common stay cables...

AI Technical Summary

Problems solved by technology

[0005] The disadvantage of this method is that long-term closure or restricted traffic will bring adverse social and economic impacts; at the same time, the main girder in this area is in a state of no cable support when the cable is unloaded, because the compressive stress reserve of the old bridge after many years of operation is no longer accurate. It is known that cable replacement will increase the local tensile stress of the main girder and increase the risk of cracking, and even cause irreversible serious damage. It is not suitable for cable replacement in areas with small compressive stress reserves or long cable areas.

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