Method for installing and using cable-stayed bridge reinforced concrete cable tower prestressed system

Abstract

The invention belongs to the technical field of cable-stayed bridge construction, in particular relates to a method for installing and using a cable-stayed bridge reinforced concrete cable tower prestressed system, and solves the problem that a steel bar, a prestressed end and a prestressed steel bar at the prestressed end are subjected to cross interference due to the traditional anchor box with the prestressed end. The method comprises the following steps of: precasting a prestressed system, namely fixing a pier head anchor, an anchor box and a prestressed steel wire bundle; measuring and lofting the position of the anchor box; installing the anchor box; installing the prestressed system; performing prestressed tensioning and mud jacking; and performing water prevention and anchor sealing. The invention has the advantages that: the influence of the end on the common steel bar can be reduced, and the steel bar is prevented from being cut off; and a special template is not required to be installed during subsequent anchor sealing, the cubic amount of used concrete is small, workload is low, and the prestressed system is easy to construct.

Description

technical field [0001] The invention belongs to the technical field of cable-stayed bridge construction, and in particular relates to a method for installing and using a reinforced concrete tower prestressing system of a cable-stayed bridge. Background technique [0002] On the prestressed reinforced concrete cable tower of the cable-stayed bridge, the prestressed end adopts the form of combining the anchor pad and the anchorage, and a square or circular anchor box (anchor hole) needs to be set at the end. (anchor hole) occupies a certain space on the tower. However, after the prestress is applied, the local compressive stress of the concrete at the prestressed end of the cable tower is larger than that in other areas, so it is necessary to arrange denser steel bars at the prestressed end during the design of the cable tower structure, thus causing The steel bars at the anchor box (anchor hole) at the prestressed end intersect with the prestressed end and the prestressed te...

AI Technical Summary

Problems solved by technology

[0003] The present invention solves the cross-interference between the steel bar and the prestressed end and the prestressed tendon at the prestressed end caused by the anchor box (anchor hole) at the lower end of the traditional prestressed system on the cable-stayed bridge cable pylon. hole) large-area anchor sealing problem, the traditional prestressed system is changed to a steel bundle prestressed system with anchor boxes and pier head anchors. The anchor box under this prestressed system consists of inner and outer casings and anchor pads. It is combined with the slab and the protective cover plate, which avoids the cross interference of the steel bar with the prestressed anchor head and the prestressed tendon at the prestressed anchor head to cut off the steel bar, and simplifies the prestressed construction process, providing a cable-stayed bridge reinforced concrete cable Installation and use method of tower prestressing system

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