Turning type height-variable road height-limiting portal frame

The invention discloses a turning type height-variable road height-limiting portal frame, belongs to the field of safety protection of urban roads and highways, and particularly relates to a height-limiting device capable of changing the height to limit passing of ultrahigh vehicles. The turning type height-variable road height-limiting portal frame is mainly composed of a cross beam, upper standcolumns, lower stand columns and foundation seats, wherein the stand columns of the height-limiting portal frame are divided into an upper part and a lower part, the upper stand columns can be turnedwithin the 90-degree range, the cross beam is installed on the upper stand columns, the position of the cross beam is changed by turning the angles of the upper stand columns through a driving device,and height change of the height-limiting portal frame is achieved. Compared with a lifting type height-limiting portal frame in the prior art, the turning type height-variable road height-limiting portal frame has the advantag