A method for applying external prestress of assembled slab bridge

Abstract

The invention relates to the technical field of highway bridge construction and maintenance, in particular to a method for applying external prestress to an assembled slab bridge. The method is wide in application, can be used for upgrading and rebuilding of newly-built bridges and existing bridges and solidification of old bridges, and can also be used for other bridge types. According to the method, external prestress is flexible to apply, can be applied to partial slab bridge or even a block of slab bridge, and can also be applied to a full-span bridge; the method can be used as a temporary solidifying means when an overweight vehicle passes the bridge, and can also be used as a permanent measure for improving bridge loading class; the method can not only be applied to a prestressed concrete slab bridge, but also be applied to a reinforced concrete slab bridge; and by applying external prestress to the assembled slab bridge, the loading capacity of the assembled slab bridge can be improved, and the service life of the slab bridge can be prolonged.

Description

Technical field [0001] The invention relates to the technical field of highway bridge construction and maintenance, in particular to a method for applying external prestress of a fabricated slab bridge. Background technique [0002] Since the reform and opening up, my country's highway transportation has developed rapidly. As of the end of 2014, the total mileage of highways nationwide reached 4,463,900 kilometers, of which highway mileage was 111,900 kilometers. Bridges are an important part of highways. With the rapid development of highway construction, the number of bridges is also increasing rapidly. According to incomplete statistics, there are currently about 500,000 bridges of various types in my country, and more than 10,000 bridges are under construction each year. my country is now moving from a “bridge power” to a “bridge power” in the world. [0003] The prefabricated slab bridge is a common bridge type with large volume and wide area among highway bridges. It has a s...

AI Technical Summary

Problems solved by technology

[0004] Prefabricated slab bridges are prone to the following problems: first, the lateral connection is weak; second, the bearing capacity decreases due to factors such as prestress loss during use; third, the bearing capacity of the bridge slab with the same hole varies greatly

For prefabricated slab bridges, the design distance between the slabs is only 1cm, and the actual distance is often less than 1cm, while the geometric dimensions of the prestressed beams and other devices are much larger than 1cm, so it is not advisable to arrange the external cables outside the bridge slab; Or, for a solid bridge deck, it is impossible to arrange the external cables inside. For a hollow bridge deck, the geometric size of the hollow part is often only a few tens of centimeters, and people cannot enter it. It is very difficult to install external cables and other devices. Maintenance is also very troublesome and difficult, so it is not advisable to arrange the external cables on the inside of the bridge plate

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