DEVELOPMENT OF STREAMLINING TECHNOLOGY FOR DECKS REMOVAL OF STEEL COMPOSITE GIRDER BRIDGES

Abstract

 Renewal projects due to aging on expressways nationwide are intensifying. Among these, the deck replacement of bridges accounts for the majority of project costs. Particularly, the removal of the existing deck slab on steel composite girder bridges is labor-intensive and time-consuming. To improve this issue, element experiments were conducted to confirm the effectiveness of two rationalization techniques. Then, full-scale experiments were also conducted to verify the constructability of the selected technique based on the results of the element experiments. Initially, in the element experiments, it was confirmed that cutting the stud portions from the top surface of the deck with a large wall saw is highly effective. In full-scale experiments, it was confirmed that existing deck concrete can be removed block by block without breaking it, thus maintaining its shape. This technology has been successfully applied to a steel composite girder bridge on the expressway.