This invention concerns stanchions, such as utility poles, having an energy absorbing layer to mitigate damage and severity of impact of a motor vehicle.
Stanchions, such as utility poles carrying electrical power lines, as well as supports for road signs and billboards, by virtue of their roadside position, are subject to collisions with motor vehicles, often traveling at relatively high speeds. The Insurance Institute for Highway Safety reports that of the 7,627 fatalities attributable to vehicle collisions with fixed objects in 2015, fully 12%, or about 915 deaths, occurred in collisions with utility poles. Statistics show that the number of fatalities has varied little year to year since 1979, which recorded over 10,000 fatalities due to fixed object collisions of all types. Furthermore, 40% of non-fatal collisions with utility poles result in injury. The cost of such collisions, including medical costs, disruption to electrical service, and repair of damaged poles tallies in the billions. There is clearly an opportunity to improve safety and crashworthiness of roadside stanchions such as utility poles and thereby reduce fatalities and associated costs.
This invention concerns a utility pole for supporting electrical power lines. In one example embodiment the pole comprises a first pole portion, a second pole portion, an attachment segment, and an energy absorbing layer surrounding the attachment segment. The first pole portion is adapted to be positioned at least partially below ground. The second pole portion is adapted to extend above ground and support the power lines. The attachment segment has a first end attached to the first pole portion and a second end attached to the second pole portion. The attachment segment is adapted to be positioned above and proximate to the ground. The energy absorbing layer has a lower compression strength than the first and second pole portions.
In a particular example embodiment the attachment segment has a first bulkhead, a second bulkhead and a tube. The first bulkhead is attached to the first pole portion. The second bulkhead is attached to the second pole portion. The tube has a first end attached to the first bulkhead and a second end attached to the second bulkhead. In another example the tube is coaxially aligned with the first and second pole portions. In another example the tube has a smaller perimeter than said first and second pole portions. Another example further comprises a sleeve surrounding said tube. In another example the sleeve is arranged coaxially with the tube. In another example the sleeve has a perimeter equal to the perimeter of the first and second pole portions.
In another example, the energy absorbing layer is positioned between the sleeve and the tube. In another example the energy absorbing layer comprises foamed aluminum. In another example the energy absorbing layer comprises a resilient, elastic material. In another example the energy absorbing layer comprises rubber.
In a further example, the energy absorbing layer surrounds the tube. By way of example energy absorbing layer comprises foamed aluminum. In another example, energy absorbing layer comprises a resilient, elastic material. In another example, energy absorbing layer comprises rubber.
By way of example the attachment segment first end is bolted to the first pole portion. In another example the attachment segment first end is welded to the first pole portion. In another example attachment segment second end is bolted to the second pole portion. In another example the attachment segment second end is welded to the second pole portion.
By way of example the first bulkhead is bolted to the first pole portion. In another example the first bulkhead is welded to the first pole portion. In another example the second bulkhead is bolted to the second pole portion. In another example the second bulkhead is welded to the second pole portion. In another example the tube first end is bolted to the first bulkhead. In another example the tube first end is welded to the first bulkhead. In another example the tube second end is bolted to the second bulkhead. In another example the tube second end is welded to the second bulkhead.
In an example embodiment the sleeve has a perimeter greater than a perimeter of said first and second pole portions.
In another example embodiment a stanchion comprises a first stanchion portion, a second stanchion portion, an attachment segment, and an energy absorbing layer surrounding the attachment segment. The first stanchion portion is adapted to be positioned at least partially below ground. The second stanchion portion is adapted to extend above ground. The attachment segment has a first end attached to the first stanchion portion and a second end attached to the second stanchion portion. The attachment segment is adapted to be positioned above and proximate to the ground. The energy absorbing layer has a lower compression strength than the first and second stanchion portions.
In a particular example embodiment the attachment segment has a first bulkhead, a second bulkhead and a tube. The first bulkhead is attached to the first stanchion portion. The second bulkhead is attached to the second stanchion portion. The tube has a first end attached to the first bulkhead and a second end attached to the second bulkhead. In another example the tube is coaxially aligned with the first and second stanchion portions. In another example the tube has a smaller perimeter than said first and second stanchion portions. Another example further comprises a sleeve surrounding said tube. In another example the sleeve is arranged coaxially with the tube. In another example the sleeve has a perimeter equal to the perimeter of the first and second stanchion portions.
In another example the energy absorbing layer is positioned between the sleeve and the tube. In another example the energy absorbing layer comprises foamed aluminum. In another example the energy absorbing layer comprises a resilient, elastic material. In another example the energy absorbing layer comprises rubber.
In a further example, the energy absorbing layer surrounds the tube. By way of example energy absorbing layer comprises foamed aluminum. In another example, energy absorbing layer comprises a resilient, elastic material. In another example, energy absorbing layer comprises rubber.
In another example the stanchion further comprises at least one light mounted on the second stanchion portion. In another example the stanchion further comprises at least one sign mounted on the second stanchion portion.
By way of example the attachment segment first end is bolted to the first stanchion portion. In another example the attachment segment first end is welded to the first stanchion portion. In another example attachment segment second end is bolted to the second stanchion portion. In another example the attachment segment second end is welded to the second stanchion portion.
By way of example the first bulkhead is bolted to the first stanchion portion. In another example the first bulkhead is welded to the first stanchion portion. In another example the second bulkhead is bolted to the second stanchion portion. In another example the second bulkhead is welded to the second stanchion portion. In another example the tube first end is bolted to the first bulkhead. In another example the tube first end is welded to the first bulkhead. In another example the tube second end is bolted to the second bulkhead. In another example the tube second end is welded to the second bulkhead.
In an example embodiment the sleeve has a perimeter greater than a perimeter of said first and second stanchion portions.
Pole 12 comprises a first pole portion 18 adapted to be positioned below ground 20 and anchor the pole 12 in place. Additional anchoring may be provided by, for example concrete footings or casements (not shown) at or below ground level. A second pole portion 22 is adapted to extend above ground 20, the second pole portion supporting structures such as arms 14 and cross members 16. Pole portions 18 and 22 may have any cross sectional shape, the example pole 12 cross section being shown in
In the example embodiment shown in
As further shown in
In an example embodiment shown in
In the example embodiment, a sleeve 54 surrounds the tube 38. Sleeve 54 is arranged coaxially with the tube 38 and protects the energy absorbing layer 52. The sleeve 54 may have a perimeter 56 of the same cross section shape and equal in dimensions to the perimeters of the first and second pole portions and thus form an outer surface 58 substantially continuous with the outer surfaces 60 and 62 of the pole portions 18 and 22 (see
Attachment details for example embodiments are shown in
The welded attachment details for an example embodiment are illustrated in
As shown in
Embodiments 64 and 74 permit the energy absorbing layer to be enlarged relative to the diameter of the pole portions 18 and 22 as needed to absorb more energy as the situation requires.
Stanchions 10 such as utility poles 12 described herein are expected to prevent or lessen the collapse of such structures when struck by a vehicle while also mitigating injury and death of vehicle occupants.
This application claims priority to U.S. Provisional Application No. 62/550,192, filed Aug. 25, 2017 and hereby incorporated by reference in its entirety.
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Number | Date | Country | |
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Number | Date | Country | |
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62550192 | Aug 2017 | US |