Efficient Erection Method of Cantilever Bridge Deck Using Ribbed Steel Form Bolted to Girder

In this study, in order to erect a cantilever deck without supports and formwork, the use of a steel-concrete composite cantilever deck system was explored. The cantilever deck system consists of steel plate, perfobond ribs that have been welded onto the steel plates, concrete, and reinforcing bars. In order to form a cantilever deck, the steel forms consisting of steel plate and ribs must be fabricated then, the ribs of steel form were bolted to the girder to prevent large rotation and deflection under erection loads and finally, the concrete must be cast-in-place. A total of four specimens were built and tested under erection loads. As a result of the tests, it is found that, under erection loads, the weight of the laborers, and wet concrete, the connection of the ribs to the girders has enough stiffness to satisfy in-erection deflection and the bolt connections supply sufficient force to prevent rotation. The proposed cantilever deck erection method should improve the efficiency and economy of bridge construction.