The present invention relates to a soundproof tunnel that prevents the propagation and diffusion of traffic noise by closing the upper part of an existing bridge. , the protrusion 50 supports the soundproof tunnel in which a plurality of soundproofing plates 30 are coupled to the structural wall 40 and the horizontal bone 45 . Through the present invention, it is possible to not only install a soundproof tunnel without extensive remodeling or new structures around or under the existing bridge, but also maintain the traffic processing capability of the existing bridge despite the soundproof tunnel installation.
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