Patent ID: 9291055
Filing Date: 2016-03-22
CPC Classification: B61B,E21D,E21F

Claim Text:
1. A micro pressure wave reduction structure for a tunnel, comprising: a hood structure formed in front of an entry of a railroad tunnel; and an air pipe section in which at least one air pipe is provided along circumference of the hood structure, wherein the air pipe comprises a horizontal introduction section formed to be extended from an internal side of the hood structure toward a longitudinal direction of the hood structure, an outlet section formed on an external side of the hood structure, and an intermediate section connecting the horizontal introduction section and the outlet section through each other, the air pipe section comprises a plurality of air pipes provided at intervals along the longitudinal direction of the hood structure, and the hood structure comprises a plurality of hoods, which are divided and arranged to be spaced with a gap along the longitudinal direction and the air pipe section further comprises a filling section formed in the gap to close a remaining area of the gap where no air pipe is provided.