Patent ID: 8240580

Claim:
A ballast retaining structure used for a bedded track provided with a track bed formed by laying ballast on a roadbed, performing tamping to form a bed-like structure having a predetermined cross-sectional shape such as a trapezoid, and extending the bed-like structure in an extending direction of the roadbed; a plurality of sleepers disposed on the track bed such that longitudinal directions of the sleepers are perpendicular to an extending direction of the track bed; and a pair of rails fastened to upper surfaces of the plurality of sleepers along the extending direction of the track bed, the ballast retaining structure being provided on both sides in a transverse direction of the track bed and along the extending direction of the track bed to thereby retain the track bed from the both sides in the transverse direction thereof, the ballast retaining structure comprising: a first layered body constituted by a plurality of bag-like objects, each being formed in a bag shape and containing the ballast, stacked from a toe of slope to a top of slope of the track bed and extended in the extending direction of the roadbed, wherein the bag-like object has communication holes for communicating an inside and an outside of the bag-like object formed in at least upper and lower surfaces of the bag-like object; wherein one of the communication holes formed in the upper or lower surface of the bag-like object is arranged so as to oppose one of communication holes of a bag-like object adjacent to the bag-like object; wherein the ballast retaining structure includes a first connection member which has a bar-like shape, is passed through mutually opposing communication holes among the communication holes of the plurality of bag-like objects to be located inside the first layered body with a leading end of the first connection member being buried into the roadbed, and thereby connects with each other the plurality of bag-like objects constituting the first layered body; and wherein the first connection member includes an upper lock portion to downwardly press an upper surface of the first layered body, the upper lock portion being provided in a vicinity of an upper end of the first connection member.