A Longitudinal Prestressed Strengthening Method of Hollow Slab Girder Bridge

Abstract

The invention discloses a hollow slab grider bridge longitudinal prestressing reinforcement method. The hollow slab grider bridge longitudinal prestressing reinforcement is characterized in that a route is so designed that a folded prestressing tendon is in the longitudinal direction on the a hollow slab grider bridge, a small steel grider is made, according to the designed route of the folded prestressing tendon on the hollow slab grider bridge, holes are dilled on the hollow slab grider bridge, the folded prestressing tendon penetrates through the holes of the hollow slab grider bridge, a redirector is arranged on the junction of the horizontal segment and the inclined segment of the folded prestressing tendon, the redirector is arranged on the lower side surface of the hollow slab grider bridge, the installing position of the folded prestressing tendon is cut on the end portion of the hollow slab grider bridge in the transverse direction, the small steel grider is crosswise arranged on the bridge, the folded prestressing tendon penetrates through the small steel grider and the end portion of the folded prestressing tendon is fixed in an anchored mode through the tension of an anchorage. The hollow slab grider bridge longitudinal prestressing reinforcement method has the advantages of being capable of enhancing longitudinally bearing capacity of the hollow slab grider bridge, reducing occupations at elevated heights under the bridge, increasing longitudinal flexural capacity, improving shear capacity of the bridge, and quickly completing most construction on the bridge surface.

Description

technical field [0001] The invention belongs to the technical field of bridge engineering, and in particular relates to a longitudinal prestress reinforcement method of a hollow slab girder bridge. Background technique [0002] With the increase of vehicle load and axle load, people need to reinforce the prefabricated assembled hollow slab girder bridge built in the early stage to improve its load level. The hollow slab girder bridge is generally assembled by conventional hollow slabs or hollow box girders. When only applying transverse prestress reinforcement along the bridge width direction is not enough to achieve the required load level, it is necessary to increase the bearing capacity of the prefabricated hollow slab girder through longitudinal reinforcement. Longitudinal prestressing is a more efficient method than pasting steel plates or carbon fiber strips. Conventional longitudinal reinforcement is to place steel strands or prestressed tendons of other materials un...

AI Technical Summary

Problems solved by technology

It is difficult to install this kind of anchor with high requirements under the bridge, because it needs to meet the needs of tension, and the size of the anchor is large, which affects the view

The anchor is anchored on the bottom of the hollow slab with a small thickness, the local stress is relatively large, and there are safety hazards during construction and operation

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