Floor structure of railcar and railcar including same
A floor structure of a railcar includes: a pair of side sills extending in a railcar longitudinal direction; cross beams extending in a railcar width direction and coupling the pair of side sills; a supporting member, which is arranged on upper surfaces of the cross beams, in which bottom surface portions and convex portions projecting upward from the bottom surface portions are alternately, continuously formed in the railcar width direction, and which extends in the railcar longitudinal direction; receiving members located at positions corresponding to the cross beams, arranged on an upper surface of the supporting member, and extending in the railcar width direction; and a floor panel arranged on upper surfaces of the receiving members. The receiving members include: a floor plate contact portion that contacts the floor panel; and leg portions, extending from the floor plate contact portion to the bottom surface portion of the supporting member.
1. A floor structure of a railcar, the floor structure comprising:
a pair of side sills extending in a railcar longitudinal direction;
a plurality of cross beams extending in a railcar width direction and coupling the pair of side sills;
a supporting member, which is arranged on upper surfaces of the cross beams, in which bottom surface portions and convex portions projecting upward from the bottom surface portions are alternately, continuously formed in the railcar width direction, and which extends in the railcar longitudinal direction;
receiving members respectively located at positions corresponding to the cross beams, arranged on an upper surface of the supporting member, and extending in the railcar width direction; and
a floor panel arranged on upper surfaces of the receiving members, wherein
each of the receiving members includes: a floor plate contact portion that contacts the floor panel; and leg portions, each of which extends from the floor plate contact portion to the bottom surface portion of the supporting member.
2. The floor structure according to claim 1 , further comprising a heat absorbing layer and a heat dispersing layer, which are arranged on upper surfaces of the convex portions of the supporting member so as to be located between the receiving members adjacent to each other in the railcar longitudinal direction.
3. The floor structure according to claim 1 , wherein:
each of the side sills includes an upper stage portion and a lower stage portion located lower than the upper stage portion, the upper stage portion and the lower stage portion being located at an upper surface side of the side sill;
railcar-width-direction end portions of the floor panel are respectively placed on the upper stage portions of the side sills; and
railcar-width-direction end portions of the supporting member are respectively placed on the lower stage portions of the side sills.
4. The floor structure according to claim 3 , wherein railcar-width-direction end portions of each of the receiving members are respectively placed on the lower stage portions of the side sills.
5. The floor structure according to claim 1 , wherein each of the leg portions of the receiving members includes a pair of first and second leg portions opposed to each other in the railcar longitudinal direction.
6. The floor structure according to claim 5 , wherein:
each of the leg portions of the receiving members further includes a leg coupling member that couples the first leg portion and the second leg portion and contacts a lower surface of the floor plate contact portion; and
each of a thickness of the first leg portion and the thickness of the second leg portion is smaller than the thickness of the floor plate contact portion.
7. The floor structure according to claim 5 , wherein a bead is formed on surfaces of the first and second leg portions.
8. A railcar comprising the floor structure according to claim 1 .