Turning type height-variable road height-limiting portal frame

Abstract

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 advantages that a driving mechanism is simple, the manufacturing cost is low, and a manual hydraulic pump is adopted, so that electric power is not needed, and the adaptability is good.

Description

technical field [0001] The invention relates to the field of urban road and road safety protection, in particular to a turning-type variable-height road height-limiting mast. Background technique [0002] Bridges and tunnels on urban roads and highways have a certain height limit to ensure the safety of vehicles. The "Regulations for the Implementation of the Road Traffic Safety Law of the People's Republic of China" stipulates: "The load on a motor vehicle must not exceed the weight approved on the motor vehicle driving license, and the length and width of the load must not exceed the compartment, and the following regulations shall be complied with: Heavy-duty and medium-sized trucks , the height of semi-trailer vehicles shall not exceed 4m from the ground, and the height of vehicles carrying containers shall not exceed 4.2m; the height of other vehicles carrying goods shall not exceed 2.5m from the ground. "Code for Design of Urban Road Engineering" CJJ37- According to t...

AI Technical Summary

Problems solved by technology

Lifting height limit mast, if it is adjusted from a small car with a height limit of 3.0m to a large vehicle with a height limit of 4.5m, the beam of the mast needs to be lifted by 1.5m, and the hydraulic lift requires a hydraulic cylinder with a stroke of 1.5m, and a screw screw to lift up to 1.5m , the lifting mechanism requires a larger size, and the lifting-type height-limiting mast is compared with the ordinary fixed mast, which adds a complex mechanical transmission mechanism and high manufacturing cost

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