Underframe structure of railcar

摘要

An underframe structure of a railcar capable of reducing a deformation amount of a cross beam supporting an underfloor equipment upon underfloor fire. The underframe structure of the railcar includes an underframe having a pair of side sills extending in a railcar longitudinal direction and a cross beam arranged between the side sills and extending in a railcar width direction, a structural floor provided on an upper surface of the underframe, and an underfloor equipment suspended down in a center part in the railcar width direction of the cross beam. The underframe structure includes a passenger cabin floor provided on an upper side of the structural floor, the passenger cabin floor forming a lower surface of a passenger cabin S, and floor receiving members supporting the passenger cabin floor and extending in the railcar longitudinal direction between the structural floor and the passenger cabin floor.

主权项

1. An underframe structure of a railcar comprising:
an underframe having a pair of side sills extending in a railcar longitudinal direction and a cross beam arranged between the side sills and extending in a railcar width direction; a structural floor provided on an upper surface of the underframe; and an underfloor equipment suspended down in a center part in the railcar width direction of the cross beam, the underframe structure further comprising: a passenger cabin floor provided on an upper side of the structural floor, the passenger cabin floor forming a lower surface of a passenger cabin; and floor receiving members supporting the passenger cabin floor and extending in the railcar longitudinal direction between the structural floor and the passenger cabin floor, wherein among the floor receiving members, a floor receiving member provided in a substantially center part in the railcar width direction is attached to the structural floor so as to bear at least a part of a load of the underfloor equipment, and the underframe structure further comprising a piping hole extending in the railcar longitudinal direction in the cross beam within a range not corresponding to a part substantially immediately below the floor receiving member which is provided in the substantially center part in the railcar width direction, wherein among the floor receiving members, the floor receiving member provided in the substantially center part in the railcar width direction is fixed to the structural floor over the entire length in the railcar longitudinal direction of the floor receiving members by welding.