US20150322691A1 - Cable backed guardrail end terminal system - Google Patents
Cable backed guardrail end terminal system Download PDFInfo
- Publication number
- US20150322691A1 US20150322691A1 US14/705,158 US201514705158A US2015322691A1 US 20150322691 A1 US20150322691 A1 US 20150322691A1 US 201514705158 A US201514705158 A US 201514705158A US 2015322691 A1 US2015322691 A1 US 2015322691A1
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- Prior art keywords
- guardrail
- post
- cable
- posts
- brake
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01F—ADDITIONAL WORK, SUCH AS EQUIPPING ROADS OR THE CONSTRUCTION OF PLATFORMS, HELICOPTER LANDING STAGES, SIGNS, SNOW FENCES, OR THE LIKE
- E01F15/00—Safety arrangements for slowing, redirecting or stopping errant vehicles, e.g. guard posts or bollards; Arrangements for reducing damage to roadside structures due to vehicular impact
- E01F15/14—Safety arrangements for slowing, redirecting or stopping errant vehicles, e.g. guard posts or bollards; Arrangements for reducing damage to roadside structures due to vehicular impact specially adapted for local protection, e.g. for bridge piers, for traffic islands
- E01F15/143—Protecting devices located at the ends of barriers
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H17/00—Fencing, e.g. fences, enclosures, corrals
- E04H17/02—Wire fencing, e.g. made of wire mesh
- E04H17/10—Wire fencing, e.g. made of wire mesh characterised by the way of connecting wire to posts; Droppers
- E04H17/12—Wire fencing, e.g. made of wire mesh characterised by the way of connecting wire to posts; Droppers the wire being placed in slots, grooves, or the like
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H17/00—Fencing, e.g. fences, enclosures, corrals
- E04H17/02—Wire fencing, e.g. made of wire mesh
- E04H17/04—Wire fencing, e.g. made of wire mesh characterised by the use of specially adapted wire, e.g. barbed wire, wire mesh, toothed strip or the like; Coupling means therefor
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H17/00—Fencing, e.g. fences, enclosures, corrals
- E04H17/14—Fences constructed of rigid elements, e.g. with additional wire fillings or with posts
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H17/00—Fencing, e.g. fences, enclosures, corrals
- E04H17/14—Fences constructed of rigid elements, e.g. with additional wire fillings or with posts
- E04H17/1413—Post-and-rail fences, e.g. without vertical cross-members
- E04H17/1447—Details of connections between rails and posts
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H17/00—Fencing, e.g. fences, enclosures, corrals
- E04H17/14—Fences constructed of rigid elements, e.g. with additional wire fillings or with posts
- E04H17/24—Connections for attaching additional wire to frames, posts or railings
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- E04H2017/1447—
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Refuge Islands, Traffic Blockers, Or Guard Fence (AREA)
Abstract
A guardrail end terminal system includes: a first guardrail post at a first end of the system; a second guardrail post located subsequent to the first guardrail post; a guardrail extruder head mounted on the first guardrail post; a guardrail positioned in the guardrail extruder head and mounted to the second guardrail post; a first cable hanging bracket on the second guardrail post; a cable brake attached to a second end of the system opposite to the first end of the system; and a first cable anchored to the first guardrail post and extending through the first cable hanging bracket to the cable brake.
Description
- This invention claims the benefit of U.S. Provisional Patent Application No. 61/990,139 filed on May 8, 2014, which is hereby incorporated by reference in its entirety.
- 1. Field Of The Invention
- The embodiments of the invention relate to a guardrail end terminal, and more particularly, to guardrail end terminal system backed by a cable.
- 2. Discussion Of The Related Art
- In general, a guardrail end terminal system is located at the oncoming traffic ends of guardrail runs. The guardrail end terminal system is designed to deflect a side impact by a vehicle and, in the alternative, absorb a head-on or shallow angle, i.e. <5 degrees, impact by a vehicle at the guardrail extruder head at the beginning of the guard end terminal system. A guardrail extruder head absorbs energy from a head-on or shallow angle impact to its impacting head by moving down the W-beam guard rail and receiving a W-beam guardrail though a feeder chute, flattening the guardrail beam in an extruder throat by squeezing the W-shape out of the guardrail beam, and then deflecting the flattened guardrail beam through a curved deflecting plate. Thus, W-beam guardrail should feed into the guardrail extruder head and absorb energy by being flattened so as to slow an impacting vehicle as the vehicle runs down a length of W-beam guardrail while flattening the guardrail beam and deflecting the flattened guardrail. Prior art examples of such guardrail extruder heads and further description of their operation can be found in U.S. Pat. Nos. 6,715,735 and 4,928,928.
- The guardrail end terminal system typically starts at the first guardrail post on which the guardrail extruder head is mounted. The guardrail end terminal system also typically includes at least second, third, fourth and fifth guardrail posts that immediately follow the first guardrail post. A guardrail is positioned within the guardrail extruder head and bolted to the second through fifth guardrail posts as well as other additional guardrail posts along the length of the guardrail. The first through fifth guardrail posts are at least included in the guardrail end terminal system in that those guardrail posts are weakened guardrail posts of the guardrail end terminal system. More particularly, weakened guardrail posts are designed to be pushed over by the guardrail extruder head as the guardrail extruder head moves down the guardrail during an impact. A guardrail end terminal system can also include sixth, seventh, eighth and ninth guardrail posts in addition to the first through fifth guardrail posts to accommodate the head-on impact of higher speed and/or heavier vehicles.
- Typically, a vehicle impacting at the guardrail extruder head or impacting the guardrail between the first and second guardrail post will let the vehicle gate or pass through the guardrail end terminal system. A guardrail end terminal system should be able to deflect a high angle impact of a vehicle at a point before the fourth weakened guardrail post of the guardrail end terminal system. That is, a vehicle impacting the guardrail between the second weakened guardrail post and the last weakened guardrail post of a guardrail end terminal system should be deflected or stopped. However, the overall height of guardrail has been raised and vehicles have become heavier such that prior art guardrail end terminal systems have difficulty in deflecting or stopping a vehicle impacting the guardrail between the second and fourth guardrail posts.
- Accordingly, embodiments of the invention are directed to a cable backed guardrail end terminal system that substantially obviates one or more of the problems due to limitations and disadvantages of the prior art.
- An object of embodiments of the invention is to provide a cable backed guardrail end terminal system that will deflect a vehicle.
- Another object of embodiments of the invention is to provide a guardrail end terminal system with a cable backing to deflect a vehicle if the vehicle impacts the guardrail anywhere between the second and fifth posts of the cable backed part of the end terminal system.
- Another object of embodiments of the invention is to provide a guardrail end terminal system with a cable backing to stop a vehicle if the vehicle impacts the guardrail between the second and fifth posts of the cable backed part of the end terminal system.
- Additional features and advantages of embodiments of the invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of embodiments of the invention. The objectives and other advantages of the embodiments of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
- To achieve these and other advantages and in accordance with the purpose of embodiments of the invention, as embodied and broadly described, a guardrail end terminal system includes: a first guardrail post at a first end of the system; a second guardrail post located subsequent to the first guardrail post; a guardrail extruder head mounted on the first guardrail post; a guardrail positioned in the guardrail extruder head and mounted to the second guardrail post; a first cable hanging bracket on the second guardrail post; a cable brake attached to a second end of the system opposite to the first end of the system; and a first cable anchored to the first guardrail post and extending through the first cable hanging bracket to the cable brake.
- In another aspect, a guardrail end terminal system includes: a first guardrail post at a first end of the system; a second guardrail post located subsequent to the first guardrail post; a third guardrail post located subsequent to the second guardrail post; an anchor attached to the first guardrail post; a first cable hanging bracket on the second guardrail post; a second cable hanging bracket on the third guardrail post; a brake tube at a second end of the system opposite to the first end of the system; a braking slug at an end of the brake tube; and a first cable connected to the anchor and extending through the first cable hanging bracket and the second cable hanging bracket to be connected to the braking slug.
- In yet another aspect, a guardrail end terminal system includes: a first guardrail post at a first end of the system; a second guardrail post located subsequent to the first guardrail post; a third guardrail post located subsequent to the second guardrail post; a fourth guardrail post at a second end of the system opposite to the first end of the system; a fifth located prior to the fourth guardrail post; an anchor attached to the first guardrail post; a first cable hanging bracket on the second guardrail post; a second cable hanging bracket on the third guardrail post; a brake bracket on the fourth and fifth guardrail posts; a brake tube attached to the brake bracket; and a braking slug at an end of the brake tube; a first cable connected to the anchor and extending through the first cable hanging bracket and the second cable hanging bracket to be connected to the braking slug.
- It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of embodiments of the invention as claimed.
- The accompanying drawings, which are included to provide a further understanding of embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of embodiments of the invention.
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FIG. 1 is a top view a 12-post guardrail end terminal system with a cable backing according to an embodiment of the invention. -
FIG. 2A is a back view of an 8-post guardrail end terminal system with a cable backing according to an embodiment of the invention. -
FIG. 2B is a top view of an 8-post guardrail end terminal system with a cable backing according to an embodiment of the invention. -
FIG. 3 is an end view of a first guardrail post according to an embodiment of the invention. -
FIG. 4A is a close-up back view of a cable hanging bracket mounted on the second guardrail post shown inFIGS. 2A and 2B . -
FIG. 4B is a close-up end view of a cable hanging bracket mounted on the second guardrail post shown inFIGS. 2A and 2B . -
FIG. 5A is a close-up top view of the cable brake mounted on the sixth, seventh and eighth guardrail posts shown inFIGS. 2A and 2B . -
FIG. 5B is a close-up back view of the cable brake mounted on the sixth, seventh and eighth guardrail posts shown inFIGS. 2A and 2B . -
FIG. 6 is a close-up back view of the cable brake shown inFIG. 5B . -
FIG. 7 is a close-up end view of the cable brake mounted on the eighth guardrail post shown inFIG. 5B . -
FIG. 8 is a view of a braking slug at the end of the backing cable shown inFIG. 5B . - Reference will now be made in detail to the preferred embodiments of the invention, examples of which are illustrated in the accompanying drawings. The invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the invention to those skilled in the art. In the drawings, the thicknesses of layers and regions may be exaggerated for clarity.
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FIG. 1 is a top view a 12-post guardrail end terminal system with a cable backing according to an embodiment of the invention. As shown inFIG. 1 , a cable backed guardrailend terminal system 1 can include first through twelfth guardrail posts 2 a-2 k, blockouts 3 at the front side of the second throughtwelfth guardrail posts 2 b-2 k, aguardrail 4 mounted to the front side of the second throughtwelfth guardrail posts 2 b-2 k through theblockouts 3, anextruder head 6 mounted at the front side of thefirst guardrail post 2 a,cable hanging brackets 7 at the back side of the second throughninth guardrail posts 2 b-2 i, acable brake 8 at the back side of the tenth through twelfth guardrail posts 2 j-2 k, ananchor 9 attached to thefirst guardrail post 2 a, and acable 10 connected between thecable brake 8 and theanchor 9 so as to pass through thecable hanging brackets 7 on the back side of the second throughninth guardrail posts 2 b-2 i. Ayoke support 5 is position between the first and second guardrail posts 2 a and 2 b such thesecond post 2 b provides additional support to thefirst post 2 a in providing an anchor point for theanchor 9. - In general, embodiments of the invention, are directed toward an improved guardrail
end terminal system 1, which uses abacking cable 10 anchored 9 at thefirst guardrail post 2 a and strung throughcable hanging brackets 7 on the backs of at least the second, third, fourth andfifth guardrail posts 2 b-2 e so as to extend to acable brake 8 mounted on at least a pair of guardrail posts 2 j and 2 k located beyond the first through fifth guardrail posts 2 a-2 e. For example, during an impact onto theguardrail 4 between thesecond guardrail post 2 b and the pair of guardrail posts 2 j and 2 k on which thecable brake 8 is mounted, thecable brake 8 provides tension on thebacking cable 10 while providing an additional length ofbacking cable 10 to be resistively fed behind the guardrail posts taking force from an impact on the guardrail. In this example, thebacking cable 10 can slide through the hangingbrackets 7 of the guardrail posts taking force from the guardrail being impacted, i.e. 2 c-2 e, as well as through the hangingbrackets 7 of guardrail posts, i.e. 2 f-2 i, between the impacted guardrail posts and thecable brake 8 so as to result in anadditional length cable 10 being resistively fed into the impacted portion of theguardrail 4 from thecable brake 8. In effect, thebacking cable 10 together with thecable brake 8 acts as an arresting cable that provides additional support behind the guardrail posts 2 b-2 i at thecable hanging brackets 7 where an impact on the guardrail occurs such that theguardrail 4 will be further supported in deflecting or stopping an impacting vehicle. - The
first guardrail post 2 a, as shown inFIG. 1 , is a weakened wood post. The second throughninth guardrail posts 2 b-2 i are yielding steel posts. The tenth through twelfth guardrail posts 2 k-2 l can also be yielding steel posts. Although a 12-post system is shown for use in high speed applications, such as highways, shorter systems can be used on roads with vehicle traffic that travels at low speeds. For example, an 8-post system having the cable brake on the seventh and eighth guardrail posts can be implemented. Moreover, cable backed guardrail end terminal systems having anywhere between eight to twelve posts can also be implemented depending upon the speed conditions of the road on which such a system will be placed. -
FIG. 2A is a back view of an 8-post guardrail end terminal system with a cable backing according to an embodiment of the invention.FIG. 2B is a top view of an 8-post guardrail end terminal system with a cable backing according to an embodiment of the invention. Line G-G′ inFIG. 2A is the ground line. As shown inFIGS. 2A and 2B , a cable backed guardrailend terminal system 10 can include first through eighth guardrail posts 12 a-12 h, blockouts 13 at the front side of the third through eighth guardrail posts 12 c-12 h, aguardrail 14 mounted to the front side of the second through eighth guardrail posts 12 b-12 h through theblockouts 13, anextruder head 16 mounted at the front side of the first guardrail post 12 a,cable hanging brackets 17 at the back side of the second through fifth guardrail posts 12 b-12 e, acable brake 18 at the back side of the sixth through eighth guardrail posts 12 f-12 h, ananchor 19 attached to the first guardrail post 12 a, and abacking cable 20 connected between thecable brake 18 and theanchor 19 so as to pass through thecable hanging brackets 17 on the second through fifth guardrail posts 12 b-12 e. - The
guardrail 14 is not mounted in theguardrail extruder head 16 but rather an extension of theguard rail 14 is positioned within theguardrail extruder head 16. Thus, theguardrail 14 is not attached to either the first guardrail post 12 or theguardrail extruder head 16. However, theguardrail 14 is mounted to thesecond guardrail post 12 b and to the third through eighth guardrail posts 12 c-12 h throughblockouts 13. - The first guardrail post 12 a, as shown in
FIGS. 2A and 2B , is a weakened wood post set in asoil tube 21 with asoil plate 22. A weakening hole 12 aa through the first guardrail post 12 a weakens the first guardrail post 12 a. The weakenedwood post 12 a can be broken at the weakening hole 12 aa by theguardrail extruder head 16 as theguardrail extruder head 16 moves along theguardrail 14 during a head-on or shallow angle impact on theguardrail extruder head 16. - The second through eighth guardrail posts 12 b-12 h are yielding steel posts having an I-beam configuration with a web between two flanges. Yielding
holes 23, as shown inFIG. 2A , are in both flanges at both front and back sides of each of the second through eighth guardrail posts 12 b-12 h near the ground line G-G′. Such positioning of the yieldingholes 23 weakens the flanges of the yielding steel posts near the ground line G-G′ enables the yielding steel posts 12 b-12 h to bend over if theguardrail extruder head 16 moves along theguardrail 14 during a head-on or shallow angle impact on theguardrail extruder head 16. That is, as theguardrail extruder head 16 moves along theguardrail 14, theback bar 16 a of theguardrail extruder head 16 can knock theblockouts 13 off of theguardrail 14 and push/knock over the second through eighth yielding steel posts 12 b-12 h. - The
anchor 19 passes through the weakening hole 12 aa of the first guardrail post 12 a on one side of the first guardrail post 12 a and through a bearingplate 24 on the other side of the first guardrail post 12 a. As theguardrail extruder head 16 moves along theguardrail 14 during a head-on or shallow angle impact on theguardrail extruder head 16, the first guardrail post 12 a will be broken across the weakening hole 12 aa by the guardrail extruder head such that theanchor 19 can be released. Aguardrail cable 25 can also be connected to theanchor 19 and extend to aguardrail grabber 26, which is detachably attached to theguardrail 14. Theguardrail grabber 26 is detachably attached in that theguardrail grabber 26 can be knocked off theguardrail 14 by theback bar 16 a of theguardrail extruder head 16 as theguardrail extruder head 16 moves along theguardrail 14 during a head-on or shallow angle impact on theguardrail extruder head 16. - A
yoke support 15 is position between the first and second guardrail posts 12 a and 12 b such thesecond post 12 b provides support to thefirst post 12 a and the bearingplate 24 in providing an anchor point for theanchor 19. Further, theyoke support 15 can extend to and come into contact with the bearingplate 24 at both sides of the first guardrail post 12 a to provide support from thesecond guardrail post 12 b to the bearingplate 24. In the alternative, a pair of angle iron strut supports can be used in place of theyoke 15. Thus, a first angle iron strut support can be attached at the front sides of the first and second guardrail posts 12 a and 12 b to provide support to thefirst post 12 a and the bearingplate 24 in providing an anchor point for theanchor 19. Further, a second angle iron strut support can be attached at the back sides of the first and second guardrail posts 12 a and 12 b to provide support to thefirst post 12 a and the bearingplate 24 in providing an anchor point for theanchor 19. Both the first and second strut supports can extend to and come into contact with the bearing plate. -
FIG. 3 is an end view of a first guardrail post according to an embodiment of the invention. As shown inFIG. 3 , theanchor 19 extends through the first guardrail post 12 a and through the bearingplate 24. Awasher 27 andnut 28 fasten the anchor to the first guardrail post 12 a. The bearingplate 24 extends beyond the sides of the first guardrail post 12 a and the sides ofsoil tube 21 such that theyoke 15 can provide support to the bearing plate across both sides of the first guardrail post 12 a to provide support from thesecond guardrail post 12 b to the bearingplate 24.Bolts 29 used to fasten thesoil plate 22 to thesoil tube 21 can be used to provide support for the first guardrail post 12 a. -
FIG. 4A is a close-up back view of a cable hanging bracket mounted on the second guardrail post shown inFIGS. 2A and 2B .FIG. 4B is a close-up end view of a cable hanging bracket mounted on the second guardrail post shown inFIGS. 2A and 2B . As shown inFIGS. 4A and 4B , thebacking cable 20 passes through acable hanging bracket 17, which is attached with afastening mechanism 30 to the back side of thesecond guardrail post 12 b. Thecable hanging bracket 17 can be configured such that thebacking cable 20 can easily slide through thecable hanging bracket 17 but yet encloses thebacking cable 20. Thecable hanging bracket 17 can also be configured to haveflanges 17 a to prevent binding of thebacking cable 20 when thebacking cable 20 is sliding through thecable hanging bracket 17 during an impact. - The
cable hanging bracket 17 can be placed on thebacking cable 20 and attached to the o the back side of thesecond guardrail post 12 b with thefastening mechanism 30. Thefastening mechanism 30 includes abolt 31 that slides through the back side of thesecond guardrail post 12 b and acable hanging bracket 17 as well as aspacer 32 within thecable hanging bracket 17. Thespacer 32 provides a bind-free upper surface for thebacking cable 20 and provides spacing for thebacking cable 20 to easily slide through thecable hanging bracket 17. Awasher 33 and anut 34 on thebolt 31 secure the attachment of thecable hanging bracket 17 to the back side of thesecond guardrail post 12 b. -
FIG. 5A is a close-up top view of the cable brake mounted on the sixth, seventh and eighth guardrail posts shown inFIGS. 2A and 2B .FIG. 5B is a close-up back view of the cable brake mounted on the sixth, seventh and eighth guardrail posts shown inFIGS. 2A and 2B . Line G-G′ inFIG. 5B is the ground line. As shown inFIG. 5A ,guardrail fasteners 35 attach theguardrail 14 to the front side or front flange of the sixth, seventh and eighth guardrail posts 12 f-12 h through theblockouts 13. As shown in bothFIGS. 5A and 5B ,cable brake fasteners 36 attach thecable brake 18 to the back side or back flange of the sixth, seventh and eighth guardrail posts 12 f-12 h. More specifically, thecable brake fasteners 36 attach thebrake bracket 37 of thecable brake 18 to the back side or back flange of the sixth, seventh and eighth guardrail posts 12 f-12 h. Thebrake bracket 37 spans across the sixth, seventh and eighth guardrail posts 12 f-12 h. Abrake tube 38 is attached to the brake bracket between the sixth and seventh guardrail posts 12 f and 12 g. - Although the
brake bracket 37 is shown inFIGS. 5A and 5B as spanning three guardrail posts, a brake bracket can alternatively span four or more guardrail posts. In another alternative, a brake bracket could span just two guardrail posts if the guardrail posts are not yielding steel or weakened wood posts. A sufficient number of guardrail posts should be spanned and attached to the brake bracket such that thecable brake 18 is held in place while thebacking cable 20 is resistively pulled from thecable brake 18 as a result of an impact on a portion of the guardrail at the front of guardrail posts backed by thebacking cable 20. In another alternative, a series ofbrake brackets 37 can be attached to thebrake tube 38 that each respectively attach to a guardrail post such that a single long length of brake bracket spanning across two or more guardrail posts is not used so as to reduce material usage. - As shown in
FIGS. 5A and 5B , thebacking cable 20 enters into one end of thebrake tube 38 and passes within thebrake tube 38 so as to attach to acable end 39 at the other end of thebrake tube 38. Abraking slug 40 is affixed on thecable end 39. Thus, thebraking slug 40 is connected to thebacking cable 20 through thecable end 39. During an impact when the backing cable is pulled by a pulling force P, as shown inFIG. 5B , thebraking slug 40 is pulled through thebrake tube 38 and provides resistance to the pulling force P. More particularly, thebraking slug 40 deforms or reshapes the brake tube such that a resistive force, opposite to the pulling force, is imparted on thebraking slug 40 as thebraking slug 40 is pulled through thebrake tube 38. -
FIG. 6 is a close-up back view of the cable brake shown inFIG. 5B . As shown inFIG. 6 , thebrake bracket 37 is welded 41 to thebrake tube 38. Thebrake bracket 37 can haveoval holes 42 andcircular holes 43 for attachment to guardrail posts. Thebrake tube 38 can have stop-bolt holes 44 through which bolts (not shown) are mounted to prevent a braking slug from coming out of thebrake tube 38 but yet enabling a backing cable to be resistively fed from thebrake tube 38. -
FIG. 7 is a close-up end view of the cable brake mounted on the eighth guardrail post shown inFIG. 5B . As shown inFIG. 7 , thebrake bracket 37 can be angle iron that is attached to the eighth guardrail post 12 with acable brake fastener 36. The brake tube welded 41 to thebrake bracket 37 can have a rectangular shape withshort sides long sides 38 c and 38 d. Ashort side 38 b of the rectangular-shaped brake tube is positioned against thebrake bracket 37 and thelong sides 38 c and 38 d of the rectangular-shaped brake tube extend from thebrake bracket 37. Thebraking slug 40 has a diameter D greater than a width W measured between thelong sides 38 c and 38 d of the rectangular-shaped brake tube. - As the
braking slug 40 is pulled through the rectangular-shaped brake tube due to an impact on the guardrail, thelong sides 38 c and 38 d of the brake tube are bulged out and theshort side 38 a of the brake tube, positioned away from thebrake bracket 37, moves toward theshort side 38 b of the brake tube adjacent to thebrake bracket 37. The rectangular-shaped brake tube is deformed by thebraking slug 40 bulging out thelong sides 38 c and 38 d of the brake tube and collapsing theshort side 38 a of the rectangular-shaped brake tube toward the othershort side 38 b of the rectangular-shaped brake tube. The force required to cause the deformation of the rectangular-shaped brake tube as thebraking slug 40 is pulled through the rectangular-shaped brake tube together with a frictional force between thebraking slug 40 and thesides braking slug 40 is pulled through the rectangular-shaped brake tube creates the resistive force on thebraking slug 40 as thebraking slug 40 is pulled through the rectangular-shapedbrake tube 38. Thus, thebacking cable 20, which is attached to thebraking slug 40, can be resistively fed behind guardrail posts taking force from an impact on theguardrail 14 due to the resistive forces on thebraking slug 40 as thebraking slug 40 is pulled through the rectangular-shapedbrake tube 38. -
FIG. 8 is a view of a braking slug at the end of the backing cable shown inFIG. 5B . As shown inFIG. 8 , thebacking cable 20 terminates into acable end 39 on which thebraking slug 40 can be attached. More specifically, thebraking slug 40 can be attached to a threadedportion 39 a of the cable end with awasher 45 and anut 46. Thebraking slug 40 can include aconical portion 40 a and acylindrical portion 40 b. - Although a disclosed embodiment of the present invention shown herein include a
rectangular brake tube 38 together with abraking slug 40 having aconical portion 40 a and acylindrical portion 40, other brake tubes having other geometric shapes as well as other braking slugs having other geometric shapes are alternatively envisioned. For example, the brake tube can have a triangular shape while the braking slug has a front portion with a conical shape and a back portion with a rectangular shape. In another example, a braking slug can have a triangular wedge shape with a width less than width of rectangular brake tube but the triangular wedge shaped braking slug can have an overall height greater than the rectangular tube can. Any shape of brake tube can be used with any shape of braking slug as long as a resistive force is created by pulling the braking slug through the brake tube. The braking slug, regardless of shape, can deform, destroy or otherwise alter the shape of brake tube to create a resistive force to the braking slug being pulled through the brake tube. - It will be apparent to those skilled in the art that various modifications and variations can be made in the embodiments of the invention without departing from the spirit or scope of the invention. Thus, it is intended that embodiments of the invention cover the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.
Claims (20)
1. A guardrail end terminal system comprising:
a first guardrail post at a first end of the system;
a second guardrail post located subsequent to the first guardrail post;
a guardrail extruder head mounted on the first guardrail post;
a guardrail positioned in the guardrail extruder head and mounted to the second guardrail post;
a first cable hanging bracket on the second guardrail post;
a cable brake attached to a second end of the system opposite to the first end of the system; and
a first cable anchored to the first guardrail post and extending through the first cable hanging bracket to the cable brake.
2. The guardrail system of claim 1 , further comprising:
a second cable anchored to the first guardrail post and detachably connected to the guardrail between the first and second guardrail posts.
3. The guardrail system of claim 1 , wherein the first guardrail post is a weakened wood post.
4. The guardrail system of claim 1 , further comprising:
a support positioned between the first guardrail post and the second guardrail post.
5. The guardrail system of claim 1 , further comprising:
a third guardrail post located subsequent to the second guardrail post;
a blockout on the third guardrail post;
a second cable hanging bracket on the second guardrail post; and
wherein the guardrail is mounted to the third guardrail post through the blockout and the first cable extends through the second cable hanging bracket.
6. The guardrail system of claim 1 , wherein the second and third guardrail posts are steel yielding posts.
7. The guardrail system of claim 1 , wherein the end guardrail post is a steel yielding post.
8. A guardrail end terminal system comprising:
a first guardrail post at a first end of the system;
a second guardrail post located subsequent to the first guardrail post;
a third guardrail post located subsequent to the second guardrail post;
an anchor attached to the first guardrail post;
a first cable hanging bracket on the second guardrail post;
a second cable hanging bracket on the third guardrail post;
a brake tube at a second end of the system opposite to the first end of the system;
a braking slug at an end of the brake tube; and
a first cable connected to the anchor and extending through the first cable hanging bracket and the second cable hanging bracket to be connected to the braking slug.
9. The guardrail system of claim 8 , further comprising:
a guardrail extruder head mounted on the first guardrail post.
10. The guardrail system of claim 9 , further comprising:
a fourth guardrail post at the second end of the system opposite to the first end of the system;
a fifth located prior to the fourth guardrail post;
a guardrail mounted to the second, third, fourth and fifth guardrail posts; and
wherein the guardrail is positioned in the guardrail extruder head.
11. The guardrail system of claim 8 , further comprising:
a second cable attached to the anchor and detachably connected to the guardrail between the first and second guardrail posts.
12. The guardrail system of claim 8 , wherein the first guardrail post is a weakened wood post.
13. The guardrail system of claim 12 , further comprising:
a bearing plate at the first guardrail post through which the anchor extends; and
a support extending from the second guardrail post to the bearing plate to provide support to the bearing plate from the second post.
14. The guardrail system of claim 8 , wherein the second and third guardrail posts are steel yielding posts.
15. The guardrail system of claim 10 , wherein the fourth and fifth guardrail posts are steel yielding posts.
16. A guardrail end terminal system comprising:
a first guardrail post at a first end of the system;
a second guardrail post located subsequent to the first guardrail post;
a third guardrail post located subsequent to the second guardrail post;
a fourth guardrail post at a second end of the system opposite to the first end of the system;
a fifth located prior to the fourth guardrail post;
an anchor attached to the first guardrail post;
a first cable hanging bracket on the second guardrail post;
a second cable hanging bracket on the third guardrail post;
a brake bracket on the fourth and fifth guardrail posts;
a brake tube attached to the brake bracket;
a braking slug at an end of the brake tube; and
a first cable connected to the anchor and extending through the first cable hanging bracket and the second cable hanging bracket to be connected to the braking slug.
17. The guardrail system of claim 16 , wherein the first guardrail post is a weakened wood post.
18. The guardrail system of claim 16 , wherein the second and third guardrail posts are steel yielding posts.
19. The guardrail system of claim 18 , wherein the fourth and fifth guardrail posts are steel yielding posts.
20. The guardrail system of claim 16 , further comprising:
a guardrail extruder head mounted on the first guardrail post.
a guardrail mounted to the second, third, fourth and fifth guardrail posts; and
wherein the guardrail is positioned in the guardrail extruder head.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US14/705,158 US20150322691A1 (en) | 2014-05-08 | 2015-05-06 | Cable backed guardrail end terminal system |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US201461990139P | 2014-05-08 | 2014-05-08 | |
US14/705,158 US20150322691A1 (en) | 2014-05-08 | 2015-05-06 | Cable backed guardrail end terminal system |
Publications (1)
Publication Number | Publication Date |
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US20150322691A1 true US20150322691A1 (en) | 2015-11-12 |
Family
ID=54367356
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US14/705,158 Abandoned US20150322691A1 (en) | 2014-05-08 | 2015-05-06 | Cable backed guardrail end terminal system |
Country Status (1)
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US (1) | US20150322691A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2023194939A1 (en) * | 2019-10-09 | 2023-10-12 | Hudson David Marshall | Flexible tensioned crash barrier |
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Legal Events
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STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |