Patent Application
20070253771
The present invention relates to a barrier for roadways.
The present invention relates particularly, although by no means exclusively, to a lightweight and readily portable metal (which term includes metal alloy) roadway barrier.
Known roadway barriers include:
Whilst the above-described barriers function effectively as barriers, principally due to the substantial weights thereof, the substantial weights of the concrete and steel barriers presents significant transportation difficulties and the need to fill water into and thereafter empty water from the plastics materials shell barriers presents significant handling issues.
There is a need for a lightweight barrier that functions effectively as a barrier and can be readily be lifted into and from required roadway locations and is immediately functional as a barrier when lifted into position.
The present invention provides a lightweight, portable roadway barrier that comprises:
The internal structural framework of the above-described barrier provides sufficient rigidity for resisting collapse of the barrier in response to vehicle impact.
Specifically, the interconnected arrangement of upright and longitudinal members provides the framework with sufficient rigidity for resisting direct collapse of the barrier in the regions of vehicle impact and from uncontrolled twisting of the barrier around the longitudinal barrier axis.
The principal function of the side panels of the above-described barrier is to deflect a vehicle on impact of the vehicle against the barrier. Accordingly, it is not essential that the side panels make a substantial contribution to the rigidity of the barrier and this makes it possible to minimise the weight of the side panels. Typically, the side panels contribute no more than 30% of the rigidity of the barrier.
In use, the barriers may be a free-standing barrier or may be anchored to the ground.
Preferably the structural framework is made from steel.
Preferably the side panels are made from steel.
Preferably the weight of the barrier is less than 200 kg per meter of length of the barrier.
More preferably, the weight of the barrier is less than 150 kg per meter of length of the barrier.
It is preferred particularly that the weight of the barrier be 100 kg or less per meter of the length of the barrier.
Preferably the upright members are in the form of steel plates.
Preferably the steel plates comprise sections to which the side panels are connected.
Preferably the longitudinal member or at least one of the longitudinal members extends along the length of the barrier and is connected at opposite ends to the upright end members and is connected to the or each upright member located between the end upright members.
Preferably the longitudinal member is positioned at a height that is at or higher than 25% of the height of the barrier.
More preferably the longitudinal member is positioned at a height that is at or higher than 50% of the height of the barrier.
More preferably the longitudinal member is positioned at a height that is at or above a centre of gravity of a typical vehicle.
The applicant has found that the location of the longitudinal member as described in the three preceding paragraphs is preferable from the viewpoint of the overall rigidity of the barrier and in terms of minimising the possibility of lengthwise twisting of the barrier in response to vehicle impact.
Preferably the barrier comprises an upright member positioned midway between the end upright members.
Preferably the central upright member comprises an opening that can receive a crane hook to facilitate lifting of the barrier.
Preferably each side panel comprises a series of lengthwise extending corrugations that define panel ribs.
Preferably the side panels on opposite sides of the barrier diverge outwardly from each other when viewed from the ends of the barrier.
Preferably the barrier further comprises a lower side panel on each side of the barrier that prevents vehicle tyres penetrating the barrier and becoming engaged with the barrier.
The present invention is described further by way of example with reference to the accompanying drawing, of which:
The barrier 3 shown in the Figures comprises an internal structural framework of:
The structural framework is made from steel.
The height of the longitudinal support member 9 is selected to be at or higher than 25%, more preferably 50%, of the height of the barrier and the same as or greater than a centre of gravity of a typical vehicle.
The barrier 3 further comprises side panels 13 that extend along the length of the barrier on opposite sides thereof and are connected to the internal structural framework by bolts and or by welding the components together.
Each side panel 13 is made form steel and is corrugated and comprises three parallel crests and two parallel troughs between the crests.
The upper sections of the upright end plate 5 are similarly corrugated and the side edges of the end plates 5 diverge outwardly to form a “christmas tree” formation when viewed from the ends. Consequently, the side panels 13 diverge outwardly.
Each upright end plate 5 comprises an assembly which enables a plurality of the barriers 3 arranged end-to-end to be hinged together to form a continuous line of the barriers.
Each hinge assembly comprises four horizontally disposed and vertically spaced-apart hinge plates 17 having aligned openings 21.
The positions of the hinge plates 17 are selected so that the hinge plates 17 at one end of one barrier 3 are above or below the hinge plates at the other end of another barrier 3 when the barriers 3 are positioned end-to-end and the openings of the two sets of hinge plates 17 are aligned. Consequently, a hinge pin (not shown) can be inserted through the aligned openings 21 to hinge the two barriers together.
The barrier 3 can be used as a free-standing unit or as a unit that is anchored to the ground.
The applicant has carried out test work in relation to the barrier 3 shown in the Figures.
The test work comprised driving a 2 tone pick-up truck into a line of the barriers at 100 kilometers per hour and contacting one of the barriers at an angle of 25° to the line. This is a standard industry test to assess barrier performance.
The test work found that the particular steel barrier 3 contacted by the pick-up truck withstood the vehicle impact with an acceptable level of lengthwise twisting of the steel barrier and only a 4 meter deflection of the barriers from the original line of the barriers. In comparative test work, standard concrete and other steel barriers were found to deflect 2 meters out of line and a standard water fill plastics material shell barrier was found to deflect 6 meters.
Many modifications may be made to the preferred embodiment of the invention described above without departing from the spirit and scope of the invention.
Whilst the above described embodiment is constructed from steel, it can readily be appreciated that the present invention is not so limited and extends to barriers made from any suitable materials. By way of example, the side panels 13 could be made from aluminum or suitable plastic materials. It is envisaged that the internal structural framework be made from metals (including metal alloys).
| Number | Date | Country | Kind |
|---|---|---|---|
| 2004901104 | Mar 2004 | AU | national |
| Filing Document | Filing Date | Country | Kind | 371c Date |
|---|---|---|---|---|
| PCT/AU05/00308 | 3/3/2005 | WO | 6/8/2007 |
