arch member (roadway member)

[固定建筑物] 拱形构件（道路构件）; 弓形结构成员（路线成员）; 桥面的拱形道（桥面的车行道）; 拱道; 拱形机件（道路机件）; 拱形构件（车道构件）; 拱形构件(道路构件)