Bridge case roof beam inspection hole structure

The utility model relates to a bridge structures technical field discloses a bridge case roof beam inspection hole structure, the inspection hole has been included, stiffener, annular china fir. It is not in place that many old bridges do not set up the inspection hole of inspection hole or design because of various reasons, has caused the function disappearance of inspection hole or become the passageway of piling up of article, and this application is through rational design inspection hole and periphery clamping unit, the effectual stress concentration who has reduced the trompil production to add the blind patch and can prevent to stack debris, prevented the effect in the animal admission chamber roof beam simultaneously, effectually solved the not enough negative effects that brings of inspection hole design in traditional bridge.