Height-limiting protective frame adopting light composite material cross beam

Abstract

The invention belongs to the field of traffic infrastructures and particularly relates to a height-limiting protection frame adopting a light composite material cross beam. The frame comprises a crossbeam, two upright posts and two inclined struts, wherein the cross beam transversely penetrates through two stand columns supported on two sides of a road, bottom ends of the stand columns are fixedto a bottom foundation through anchor bolts, the two inclined struts are obliquely arranged on back faces of the two stand columns respectively and are perpendicular to a plane formed by the cross beam and the stand columns, top ends of the inclined struts are connected with the stand columns, and bottom ends of the inclined struts are fixed to a bottom foundation through anchor bolts, and the cross beam is made of a pultrusion continuous fiber reinforced foaming polyurethane composite material. The height-limiting protection frame has advantages of being light, high in strength, capable of absorbing energy, buffering and easy to install, besides the function of warning passing motor vehicles that the height exceeds the limit, energy generated by collision of the ultrahigh motor vehicles can be consumed, and the probability that casualties are caused by collapse of the cross beam is reduced as much as possible.

Description

technical field [0001] The invention belongs to the field of traffic infrastructure, and in particular relates to a height-limiting protective frame using a lightweight composite beam. Background technique [0002] When railway or highway bridges, culverts, water channels, heat pipelines and other facilities cross the highway, in order to prevent motor vehicles driving on the highway from hitting these facilities due to super height and ensure their structural safety, a height limit protective frame is generally set at a certain distance from these facilities. [0003] The limited-height protective frame is welded by round steel pipes, channel steels or I-beams, and its structural types generally have the following types: [0004] (1) Single-rod beam structure. The crossbeam of this type of height limit is a steel section, and the columns on both sides are single columns. The beam and the uprights are welded or bolted. It is generally suitable for situations where the heigh...

AI Technical Summary

Problems solved by technology

[0008] The first is that the strength and rigidity of the height limit protective frame are sufficient to resist the impact of the motor vehicle, causing damage to the motor vehicle;

[0009] The second is that the strength of the connection part of the height limit protective frame is insufficient, and the beam collapses under the impact of a motor vehicle

The beam made of steel structure is heavy, and hitting it on the motor vehicle will not only damage the motor vehicle, but also cause injury to the people in the cab;

[0010] The third is that the energy of the impact of the motor vehicle is relatively large, and the strength of the height-limiting shelf or its connecting parts is insufficient, which cannot effectively stop the motor vehicle. Railway bridges will seriously threaten the safety of railway traffic

It is constructed of steel, and despite its strength and rigidity, it is also heavy

When a motor vehicle collides with the height-limiting protective frame, the potential energy generated by the mass and speed of the motor vehicle is all borne by the height-limiting protective frame. Collapse may cause casualties or cannot prevent motor vehicles from colliding with structures such as bridges and culverts

[0012] In view of the disadvantages of the limited-height protective frame, such as not having the function of energy absorption and buffering, and easily causing casualties after collapse, it is necessary to develop a new type of limited-height protective frame, which can not only warn passing motor vehicles that the height exceeds the limit, but also reduce the impact of ultra-high motor vehicles. The generated energy minimizes the probability of casualties caused by beam collapse

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