Foothold combined use sound-absorbing system of back side under column such as high level road

摘要

PROBLEM TO BE SOLVED: To reduce noises from a car, etc., by hanging down beams on the rear side approximately horizontally at intervals, arranging a plurality of louvers made of steel in approximately parallel and fixing the louvers on the flange underside sides on the lower sides of the beams by bolts through spacers. ;SOLUTION: The sound-absorbing system is constituted by laying sound-absorbing materials 8 on a beam (c) suspended on the under-girder rear side of a viaduct in the horizontal direction together with a corridor material. A louver 1 made of steel is fixed on the underside side of the lower-side flange 2 of the beam (c) by bolts 4 through a spacer 3. The height of the spacer 3 is adjusted in response to effective thickness for reducting noises from a road in the sound-absorbing materials 8. Consequently, the top face of the sound-absorbing materials 8 is kept at the same level or less as the top face of the upper-side flange 10 of the beam (c), and a corrugated plate 9 made of steel can be installed directly onto the top face of the flange 10. Accordingly, stability in strength as the scaffold for a corridor is improved, the barrier properties of sound waves from the upper and lower sections of the viaduct, etc., are ensured, and sound-absorbing performance is displayed and noises from the road can be reduced.;COPYRIGHT: (C)1998,JPO