None.
This disclosure relates to a pedestrian access terminal such as may be used in a roadside traffic barrier to permit pedestrian access to a beach front or other attraction.
A need has been identified along roadways adjacent to pedestrian attractions such as waterbodies and hiking trails where roadside barriers are required to protect errant vehicles from encroaching into the waterbody or trail while maintaining access points through the barrier system for residents living on the opposite side of the roadway to get to the beach, dock, or trail (which may be beyond the roadway right-of-way and owned by the resident).
In some instances, local road authorities create access points through the barrier system that compromise the performance capability of the system to redirect an errant vehicle. This creates potentially hazardous ends that could penetrate and spear vehicle occupants. In other situations, residents have cut or removed parts of the barrier to provide access points.
There is a need to provide standard crashworthy terminal systems on either side of an access point that will properly anchor the end of a road barrier, such as a W-beam or thrie-beam or cable barrier system, to make the roadside barrier system redirective and functional. There is a need to provide standard crashworthy terminal systems to eliminate the potential spearing hazard of a W-beam guardrail improperly terminated with a fish-tail.
Current standard crashworthy terminal systems have gating characteristics which means that when a vehicle impacts them near the start of the terminal, they gate out of the way. One disadvantage to these systems when placed on either side of a gap is that the effective length of the gap through which an errant vehicle could get through the system into the waterbody or other terrain hazard is much longer than the physical opening length of gap provided for pedestrian access.
Terminal systems for a W-beam guardrail are typically gating systems. Another disadvantage to these systems is that W-beam terminal systems typically gate during impacts in advance of the third post downstream of the impact head. Therefore, W-beam terminal systems with a W-beam guardrail on either side of a narrow 33 inch to 65 inch wide access point for pedestrians may result in an effective gap length of approximately 30 feet. For high tension cable barrier system terminals, the effective gap length is significantly longer.
Another disadvantage to these systems is that grading requirements behind gating terminal systems require widening of the roadway in advance and along the terminal and flatter traversable slopes perpendicular to the roadway for the systems to perform as designed. At many roadway locations adjacent to waterbodies where access points are required, widening of the roadway to provide the recommended grading for gating terminals is not practical as it may require placing fill into the waterway.
Non-gating crash cushion options for W-beam and concrete barriers are available that could be used on each side of an access point. One disadvantage to these systems is that crash cushions are typically very expensive to install and require widening of the roadway in advance and along the system and flatter traversable slopes perpendicular to the roadway for the systems to perform as designed. Another disadvantage to these systems is that they are expensive to maintain. Another disadvantage to these systems is that they can be expensive to repair after impacts, dependent on severity and type of impact, and type of system (many use crushable cartridges). Another disadvantage to these systems is that they are also not aesthetically pleasing.
The National Highway Traffic Safety Administration (NHTSA) in the United States has been conducting frontal crash tests since 1978 to assess occupant protection capabilities of new cars. New vehicles are crashed head-on perpendicular into a non-deformable rigid barrier at 56 km/h (35 mph).
Air bags with lap and shoulder belts for drivers and front passengers have been required by legislation in the United States on cars manufactured since Sep. 1, 1997, and on light trucks and vans manufactured after Sep. 1, 1998. These measures significantly increase the survivability of a frontal crash.
There is an opportunity for a pedestrian access terminal that relies on the increased safety of vehicles to safely absorb a limited impact in the design of a pedestrian access terminal. There is also a need for a pedestrian access terminal that limits the probability of an arresting frontal impact.
An advantage of the embodiments of the present invention is that they provide a crashworthy terminal system to allow pedestrian access through a gap in a traffic barrier system such as a W-beam guardrail on lower speed roadways that will meet the crash test requirements of the American Association of State Highway Officials (AASHTO) Manual for Assessment of Safety Hardware (MASH) Test Level 1 (50 km/h [31 MPH]). Another advantage of the presently disclosed pedestrian access terminal is that it is less expensive to install as it does not require extensive widening of the roadway in advance of installation. Another advantage of the presently disclosed pedestrian access terminal is that it is less expensive to maintain.
Another advantage of the presently disclosed pedestrian access terminal is that it is less expensive to repair after commonly anticipated impacts. Another advantage of the presently disclosed pedestrian access terminal is that it is aesthetically pleasing.
Another advantage of the presently disclosed pedestrian access terminal is that it provides an energy absorbing endcap for attachment to the pedestrian access ends of the terminal blocks for the system to be used on moderate speed roadways that will meet the crash test requirements of AASHTO MASH Test Level 2 (70 km/h [43 MPH]).
In summary, the disclosed invention provides a unique solution to the engineering constraints and challenges of providing a pedestrian access terminal that protects pedestrians, prevents gating destruction to the terminal and is cost effective to install, maintain, and repair. The disclosed invention provides the benefits listed above while first and foremost maintaining the safety of the vehicle occupants where installed. The disclosed invention safely and economically overcomes the aforementioned disadvantages.
The advantages and features of the embodiments presently disclosed will become more readily understood from the following detailed description and appended claims when read in conjunction with the accompanying drawings in which like numerals represent like elements.
A new design for a pedestrian access terminal is disclosed. In one embodiment, the pedestrian access terminal is comprised of a right side and a left side terminal block spaced apart for pedestrian passage along a roadway. Each terminal comprises a top and an opposite bottom, an access end, and an opposite non-access end, and a traffic side and an opposite field side. A portal extends from the top to the bottom. Portal orifices extend through the traffic side of each terminal block to intersect the portal.
A pair of foundation posts is positioned below the surface and extend above the surface and into the portal of each terminal block. Portal fasteners are positioned in the portal orifices of the traffic side and connected to the foundation post in each terminal block. A tensioning member extends between the foundation posts, beneath the terminal blocks.
In another embodiment, a chamber extends through the top of the terminal block adjacent to the portal. The chamber terminates inside the terminal block. Chamber orifices extend from the traffic side and the field side to the chamber. Chamber fasteners located in the chamber orifices connect a traffic barrier to the terminal block.
In another embodiment, the tensioning member further comprises a centralized turnbuckle with a threaded bar extending from each end of the turnbuckle. A connector is attached at the opposite end of each threaded bar. A wire rope extends from each connector. A swage button is located on the opposite end of each wire rope portion. A plate washer locks the swage button of each end of the tensioning member against the foundation post.
In another embodiment, a relief is inscribed on the bottom of the terminal block. The relief intersects the portal opening at the bottom of the terminal block. The tensioning member is located in the reliefs of the terminal blocks and is anchored against the foundation post of each terminal block.
In another embodiment, a pair of lifting anchors is located at the top of each terminal block. A cover plate sufficiently large to cover the portal and the chamber on the top of the terminal block is provided. The cover plate has a pair of cover ports. Cover fasteners are located in the cover plate and connected to the lifting anchors to secure the cover plate to the top of the terminal block.
In another embodiment, an energy absorbing endcap is attached to the access end of the terminal block.
In another embodiment, the foundation post is a hollow rectangular tubular, having a first pair of opposing sides, one of which is a traffic side. The foundation post has a second pair of opposing sides, one of which is an access side. Block fastener ports extend through the first pair of opposing sides. The portal fasteners pass through the portal orifices and into the portal to connect a traffic barrier and foundation post to the terminal block.
In another embodiment, a tensioning portal extends through the second pair of opposing sides of each foundation post. A wire rope portion of the tensioning member extends through the tensioning portal of each foundation post. A swage button is connected to the end of each wire rope portion. A plate washer anchors the swage button of each tensioning member against the foundation post to allow the tensioning member to be tensioned as between the foundation posts.
In another embodiment, plate fastener ports extend through the second pair of opposing sides of the foundation post, beneath the tensioning portal. A soil plate is provided, with fastener ports in alignment with the plate fastener ports. Soil plate fasteners are located through the fastener ports of the soil plate and the plate fastener ports of the foundation post to secure the soil plate to the foundation post.
The following description is presented to enable any person skilled in the art to make and use the invention and is provided in the context of a particular application and its requirements. Various modifications to the disclosed embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other embodiments and applications without departing from the spirit and scope of the present invention. Thus, the present invention is not intended to be limited to the illustrated and described embodiments, but is to be accorded the widest scope consistent with the principles and features disclosed herein.
A tensioning member 80 is connected between foundation post 40 to further recess lateral movement of terminal block 10 when struck by a vehicle. Tensioning member 80 and soil plates 60 are located beneath road surface 2 (see
Terminal blocks 10 are typically made of precast concrete and have a mass of between 3,000 and 3,500 lbs. In one embodiment, terminal blocks 10 are located at a distance of between about 3.3 and 4.9 feet (or 1.0 and 1.5 meters) apart. In one embodiment, a bottom 14 (see
Field tests have proven that a mass of between 3,000 and 3,500 lbs. for terminal block 10, when used in combination with soil plate 60, tensioning member 80, foundation post 40, and related design features, will resist significant lateral movement upon impact with a vehicle weighing 5,000 lbs. travelling at up to 31 mph. Full scale crash tests have further proven that when modern passenger vehicles such as a quad-cab pickup truck with a weight of 5,000 pounds and a small car with a weight of 2425 pounds as specified by AASHTO MASH with impact the terminal block at a speed of 50 km/h [31 mph] at 25 degrees according to AASHTO MASH Test Level 1, vehicle occupants will be protected.
Finally, though reversible, terminal block 10 has a traffic side 20 and a field side 22 when placed in position beside a roadway. As best seen in
Referring back to
In the embodiment illustrated, terminal 10 has a chamber 28. Chamber 28 extends through the top of terminal block 10 adjacent to portal 26. Chamber 28 terminates internal to terminal block 10. Chamber orifices 34 extend through traffic side 20 of terminal block 10 to intersect with chamber 28. Chamber orifices 34 may also extend through field side 22. In this configuration, terminal block 10 is reversible with regard to chamber orifices 34 and in relationship to the roadway. Chamber fasteners 38 located in chamber orifices 34 further secure terminal block 10 to barrier transition 100.
Also, in the embodiment illustrated, soil plates 60 are attached to each side of foundation post 40 beneath terminal block 10. Fastener ports 66 (see
As seen in
As seen in
As seen in
Block fastener ports 46 extend through the first pair of opposing sides of foundation post 40. As best seen in
A tensioning portal 50 extends through the second pair of opposing sides of each foundation post. Tensioning portal 50 receives a wire rope 84 portion of tensioning member 80 extending through tensioning portal 50 of each foundation post 40. As may best be seen in
As may be best seen in
Referring back to
Plate fasteners 68 are positioned through plate fastener ports 48 and fastener ports 66 to secure soil plate 60 to foundation post 40. Block side 64 of soil plate 60 facilitates the advantageous three-way alignment of this embodiment by abutment with terminal bottom 14 of terminal block 10. In this manner, assembly of pedestrian access terminal 1 is much expedited.
Pre-tensioning of opposing terminal blocks 10 to each other provides a greatly enhanced resistance to displacement of either terminal block 10 by a vehicle leaving the roadway. The flexibility of the disclosed tensioning member 80, which is provided by wire rope sections 84, provides enhanced assembly of pedestrian access terminal 1. The minimal size of tensioning member 80 further provides for rapid and cost-effective subterranean location of tensioning member 80.
With terminal block 10 aligned with foundation post 40, connection of transition 100 to terminal block 10 is easily facilitated. By replacing cover plate 70 over portal 26 and chamber 28, access to fasteners 36 and 38 is not possible and pedestrian access terminal 1 becomes tamper resistant. Having chamber 28 terminate interior to terminal block 10 provides the advantage of preventing loss of fasteners and tools through the interior of terminal block 10 during assembly.
Terminal blocks 10 rest on soil plates 60 attached to foundation posts 40. Force applied in a collision to one end of tensioning member 80 would normally apply a bending moment on the opposing foundation post 40. In the configuration as designed and disclosed, foundation post 40 is fortified against bending by engagement within terminal block 10 above tensioning member 80, and by engagement with soil plate 60 below tensioning member 80.
The addition of energy absorbing endcap 120 is intended to work in conjunction with the crushing of the front of the passenger vehicle during impact at a velocity in excess of the IIHS requirement of 64.5 km/h [40 mph] to achieve a successful test under MASH TL-2 (passenger vehicles including 5,000 pound quad-cab pickup truck and 2,425 pound small car impacting the terminal block at 70 km/h [43.4 mph] at 25 degrees).
As used herein, the term “substantially” is intended for construction as meaning “more so than not.”
Having thus described the present invention by reference to certain of its preferred embodiments, it is noted that the embodiments disclosed are illustrative rather than limiting in nature and that a wide range of variations, modifications, changes, and substitutions are contemplated in the foregoing disclosure and, in some instances, some features of the present invention may be employed without a corresponding use of the other features. Many such variations and modifications may be considered desirable by those skilled in the art based upon a review of the foregoing description of preferred embodiments. Accordingly, it is appropriate that the appended claims be construed broadly and in a manner consistent with the scope of the invention.
Number | Date | Country | |
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63255760 | Oct 2021 | US |