WO1998044203A1 - Sequential kinking guardrail terminal system - Google Patents
Sequential kinking guardrail terminal system Download PDFInfo
- Publication number
- WO1998044203A1 WO1998044203A1 PCT/US1998/004063 US9804063W WO9844203A1 WO 1998044203 A1 WO1998044203 A1 WO 1998044203A1 US 9804063 W US9804063 W US 9804063W WO 9844203 A1 WO9844203 A1 WO 9844203A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- head
- rail element
- impact
- inlet
- kinking
- Prior art date
Links
- 230000007246 mechanism Effects 0.000 claims description 14
- 230000003116 impacting effect Effects 0.000 claims description 10
- 125000006850 spacer group Chemical group 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims 3
- 238000006073 displacement reaction Methods 0.000 claims 2
- 238000011144 upstream manufacturing Methods 0.000 abstract description 7
- 238000011282 treatment Methods 0.000 description 14
- 230000021715 photosynthesis, light harvesting Effects 0.000 description 6
- 238000005520 cutting process Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000009434 installation Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 239000002023 wood Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 201000009482 yaws Diseases 0.000 description 1
Classifications
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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
-
- 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
- E01F15/02—Continuous barriers extending along roads or between traffic lanes
- E01F15/04—Continuous barriers extending along roads or between traffic lanes essentially made of longitudinal beams or rigid strips supported above ground at spaced points
- E01F15/0476—Foundations
-
- 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
- E01F15/145—Means for vehicle stopping using impact energy absorbers
- E01F15/146—Means for vehicle stopping using impact energy absorbers fixed arrangements
-
- 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
- E01F15/145—Means for vehicle stopping using impact energy absorbers
- E01F15/148—Means for vehicle stopping using impact energy absorbers mobile arrangements
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S248/00—Supports
- Y10S248/90—Movable or disengageable on impact or overload
Definitions
- the present invention relates to an energy dissipation system for use with impact attenuation devices, such as guardrail terminals, crash cushions, and truck mounted attenuators. Specifically, the invention relates to a mechanism for sequentially kinking a rail element during vehicular impacts. Applications of this invention include: end treatments for longitudinal barriers, crash cushions, and truck mounted attenuators. Numerous end treatments have been developed for the W-beam type guardrail systems. The break away cable terminal (BCT) end treatment was designed to cause a W-beam to buckle out of the way of an impacting vehicle. There are other terminal designs based on the concept of dynamic buckling of the W-beam, such as the Eccentric Loader Terminal (ELT), U.S.
- ELT Eccentric Loader Terminal
- the Slotted Rail Terminal U.S. Pat. No. 5,407,298, controls the dynamic buckling and reduces the buckling force by cutting longitudinal slots in the W-beam rail element .
- VAT vehicle attenuating terminal
- ET extruder terminal
- U.S. Pat. No. 4,928,928 discloses the details of the ET end treatment. Impact energy is dissipated in the flattening process. Generally, the average force levels required with the ET design are approximately 12,000 pounds with little flexibility with regard to the extent of energy dissipated.
- the BEST terminal incorporates a cutting section in a manner to cut the beam of the guardrail as the means of energy dissipation.
- the energy dissipation system of the present invention utilizes an uniquely different concept.
- a sequential kinking mechanism attenuates impact energy by generating kinks, or plastic hinges, in the rail element at discrete locations.
- the mechanism sequentially kinks the rail element in small sections with incremental increases in the degree of bending as the result of discrete angular intersecting faces on the deflector plate.
- the rail may be provided with slots to aid in reducing the forces required to generate kinks in the rail element .
- the rate of energy dissipation and force level are controlled by: (a) the length of the kink which is a function of the distance between a kinker beam and the deflector plate; (b) the angles of the deflector plate; and (c) the size and locations of slots cut on the rail element.
- the present invention provides an improved quick release cable mechanism and improved sleeved mounting bolts. Further, since the prior art systems have resulted in excessive time being required to repair or replace the broken or severed posts after an impact, the present invention includes unique elongated foundation sleeves for retaining and supporting appropriate posts within the system.
- the present invention is a highway guardrail or crash attenuation system which comprises a horizontally extending guardrail mounted on a plurality of rail posts .
- the guardrail is mounted, along a vertical axis, to the posts.
- An improved impact head terminal member is slidingly positioned at a first end over the guardrail.
- the back end of the impact head is provided with an engaging plate which is designed to generally receive the engagement of an impacting vehicle .
- an inlet is provided to receive the leading end of the guardrail.
- a guide tube is attached to the inlet to guide the guardrail into the inlet.
- a kinker beam which cooperates with a kinking deflector plate rigidly attached within and extending transversely across the head to generate kinks, or plastic hinges, in the rail element at discrete locations along the guardrail.
- the deflector plate is provided with a multiplicity of discrete, intersecting, angular faces upon which the rail element impacts as the impact head is horizontally displaced along the guardrail upon engagement of an impacting vehicle .
- An anchor cable release bracket with tapered slots along a first side and enlarged openings along an opposite side is provided.
- the bracket is attached to the rail element by sleeved mounting bolts.
- the bracket is shifted laterally and then one side is forced away from the rail element and off of the mounting bolts upon impact of the guide tube .
- Foundation sleeves having an elongated slit along one side of the sleeve and stiffing ribs extending across the slit are provided to retain and support guardrail posts.
- the elongated slits in the sleeve allow the sleeve to expand when the wood post swells due to moisture. The ability for the sleeve to expand outward facilitates removal of the post after a vehicular impact.
- the elongated slits also simplify the fabrication of the foundation sleeve by reducing the amount of welding and minimizing warping of the sleeve during the welding process .
- Fig. 1 illustrates a side elevation view of a first embodiment of the present inventive highway guardrail terminal system.
- Fig. 2 illustrates a side elevation view of the impact head, guide tube, and cable release mechanism of the present invention.
- Fig. 3 illustrates a top view of the impact head, guide tube, and cable release mechanism of the present invention.
- Fig. 4 illustrates a top view of the kinking deflector plate of the present invention.
- Fig. 5 illustrates a side elevation view of the foundation sleeve of the present invention.
- Fig. 6 illustrates a top view of the foundation sleeve of the present invention.
- Fig. 7 illustrates a cable release bracket of the present invention.
- Fig. 8 illustrates an end view of a cable release bracket of the present invention.
- Fig. 9 illustrates a side elevation view of the quick release sleeved mounting bolt of the present invention. - -
- Fig. 10 illustrates an alternative embodiment of a cable release bracket of the present invention.
- Fig. 11 illustrates a crash cushion of the present invention.
- Fig. 12 shows a truck mounted attenuator of the present invention .
- DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Referring now to the drawings, and more particularly to Fig. 1, the reference numeral (12) generally represents an energy dissipating guardrail terminal of the preferred invention using the sequential kinking concept.
- the terminal which is preferentially adapted to be connected to the upstream side of a conventional guardrail (14) consisting of standard W-beam guardrail sections, either approximately 12' 6" or 25' in length. It should be understood that the sequential kinking concept is effective with other guardrail shapes and not only with the W-beam guardrail .
- the guardrail sections or rail elements (14a-14c) are attached along their vertical axes (V) by bolts (22) to a plurality of vertical breakaway posts (16a-16e) spaced apart approximately 6 '3" from each other. Again, it should be understood that the sequential kinking terminal is effective with other spacing distances . Any suitable number of posts may be used depending upon the expanse of the guardrail run.
- Fig. 1 illustrates five wooden breakaway posts. Wooden posts (16c-16e) are shown embedded directly into the soil (18) . Lead post (16a) and second post (16b) , which are shorter in length than the other posts, are shown inserted within unique foundation sleeves (20a and 20b) which will be further described below.
- Fig- 1 further illustrates an anchor cable mechanism (24) which includes an anchor cable (26), lower anchor cable bolt (28), a unique and novel anchor cable release bracket (30) , an upper anchor cable bolt (32), and eight unique and novel sleeved bolts (34) .
- the anchor cable mechanism is provided to allow the terminal (12) to withstand angular vehicle impacts downstream of its upstream end (36) .
- Figs. 7 and 8 show the detail construction of the quick release bracket which is held in tension on rail element (14a) by the sleeved bolts (34) (Fig. 9) .
- a ground strut (38) having an M-shaped yoke (39) on each end extends between the first and second posts and is provided for additional support for the anchor cable forces.
- a bolt or fastener (102) extends through the yoke and the post to secure the strut in place.
- Fig. 2 illustrates a side view of the end treatment (40) .
- the end treatment (40) includes top guide rail (42), bottom guide rail (44) , center guide rail strap (45) , end guide rail straps (46) , guide tube (48) , impact head (50) and kinker beam (51) .
- the impact head (50) is attached on the upstream end of guide tube (48) .
- Guide tube (48) is mounted onto lead post (16a) by fasteners (.52) passing through post angle brackets (54) .
- the upstream end (36) of the rail element (14a) extends into the guide tube (48) . It may be seen that the top (42) and bottom (44) guide rails extend downstream along and above the upper and lower edges of the guardrail (14), respectively.
- Guide straps (45 and 46) maintain the top and bottom guide rails in spaced apart relation.
- the guide rails ensure that the W-beam rail (14) is guided properly into the guide tube (48) and impact head (50) without the impact head (50) or guide tube (48) rotating or twisting as the end treatment (40) moves down the length of the W-beam rail (14) during a collision.
- Impact head (50) has an inlet (60) and an outlet (62) (Fig. 3) .
- a top plate (64) , and a bottom plate (66) house a sequential deflector plate (68) , a support gusset (70) , and a front impact plate (72) .
- the kinker beam (51) is attached to the top plate (64) and the bottom plate (66) and spaced apart from the first deflector face (80) of deflector plate (68).
- the kinker beam (51) of the preferred embodiment is a 20" x 2" x 2" steel box tube but any comparable sizing may be used.
- the post breaker beam (53) is a 6" x 2" x 2" box tube, post breaker (53) .
- the post breaker beam (53) is welded to the kinker beam (51) -and extends outwardly approximately 6" from the side of the kinker beam. Other suitable dimensions may be used. However, the length of the post breaker beam (53) is sufficient to extend the full width of the wood post (16a).
- the post breaker beam (53) is also generally perpendicular to the vertical axis (V) of the W-beam and is designed to engage and break the lead post (16a) when the impact head (50) is displaced downstream in a collision.
- Post (16a) is provided with a 2 1/2" diameter hole through which passes a portion of the anchor cable (26) .
- the hole is positioned slightly above the yoke (39) of strut (38) .
- the post breaker beam engages the full width of post (16a) and post (16a) will snap or break at the hole in the post.
- the beam (53) extend the full width of the post (16a) , the tests have shown that the post (16a) more easily and cleanly breaks just above the yoke (39) at the anchor cable hole.
- Fig. 3 illustrates a top view of the sequential kinking deflector plate (68) which is welded inside of impact head (50) to the inside surface of top plate (64) and bottom plate (66) .
- Deflector plate (68) is approximately 1/4" thick and 20" in height. 20" is the distance top plate (64) is spaced apart from parallel bottom plate (66) .
- the deflector plate (68) extends from the inlet (60) to the outlet (62) of the impact head (50) .
- the sequential kinking deflector plate (68) has a multiplicity of discrete, intersecting angular faces (80, 82, 84, 86 and 88) .
- Each angular face is offset by a specific angle from the vertical axis (V) of the W-beam (14) .
- First face (80) is parallel (0°) to the vertical axis of the beam (14) .
- Second face (82) intersects with first face (80) and is offset by angle (A) of approximately 20° from the vertical axis (V) of the beam (14) .
- Third face (84) intersects with second face (82) and is offset by angle (B) of approximately 40° from the vertical axis (V) of the beam (14) .
- Fourth face (86) intersects with third face (84) and is offset by angle (C) of approximately 70° from the vertical axis (V) of the beam (14) .
- fifth face (88) intersects with the fourth face (86) and is offset by angle (D) of approximately 90° from the vertical axis (V) of the beam (14) .
- the outlet (62) is formed between top plate (64), bottom plate (66), and fifth face (88) .
- the first face is approximately 3.5" wide
- second face is approximately 5.0" wide
- third face is approximately 6.4" wide
- fourth face is approximately 3.25" wide
- fifth face is approximately 4.5" wide.
- the distance between the inside edge of the kinker beam (51) and the first face (80) of the deflector plate (68) is approximately 4" in the preferred embodiment. Again, the width of the opening may be varied within reasonable ranges in order to control the length of the kinks or plastic hinges formed in the beam (14) . However, there is no squeezing extrusion of the beam (14) in the guide tube (48) or the impact head (50) . Because of the force loads which are placed upon the deflector plate (68) , gusset plate (70) is welded generally perpendicularly against the outside of the deflector plate (68) and the back impact plate (72) as shown in Figs. 2 and 3. Back impact plate (72) is attached to the upstream-most end of the impact head (50) and has protruded edges (73) to distribute the impact load and form a mechanical interlock with the colliding vehicle.
- the sequential kinking concept of the present invention entails dissipation of the kinetic energy of the impacting vehicle through kinking of the rail element (14) .
- the impact plate (72) will engage and interlock mechanically with the front of the vehicle.
- the impact head (50) will be moved forward or downstream along the rail element (14) .
- the post breaker beam (53) on the side of the kinker beam (51) will contact and break off the first or lead breakaway wooden post (16a) , thus releasing the tension on the cable (26) of the cable anchorage system (24) .
- the end (36) of the rail element (14a) will contact the second face (82) of the deflector plate (68) within the impact head and kink a short section of the rail element because of the angle (20°) built into the second face (82) .
- This kink or plastic hinge in- the rail element allows the rail deformation to be localized and thereby control the amount of energy dissipated. By designing the system to have wider or narrower spacing between the kinks, the amount of energy dissipation can be reduced or increased, respectively.
- the kinked section of the rail element will then sequentially contact the third, the fourth, and the fifth faces of the deflector plate and the extent of the kink will increase due to the larger angles of the third (40°), fourth (70°), and fifth (90°) faces.
- the kinked section will then exit the impact head (50) through outlet (62) on the backside of the impact head (50) away from the traffic. This kinking process will continue as the vehicle proceeds forward and pushes the impact head (50) along.
- the cable release bracket As the downstream portion of the guide tube reaches the unique and novel cable release bracket (30) on the rail element (14a) , the cable release bracket, which is held on rail (14) by the unique and novel sleeved bolts (34) , will be pushed forward, slide off the bolts (34) , and be released from the rail element (14a) .
- the kinking process will continue until: (a) the kinetic energy of the impacting vehicle is totally dissipated and the vehicle comes to a safe and controlled stop against the impact head, or (b) the vehicle yaws out and disengages from the impact head, by which time sufficient kinetic energy would have been dissipated so that the vehicle would gradually come to a safe and controlled stop close to the guardrail installation.
- the impacting vehicle will break off the first couple of posts, bend the rail element, and gate behind the end treatment (40) and guardrail installation.
- the terminal (12) will act like a standard guardrail section and will contain and redirect the impacting vehicle.
- the cable attachment system (24) and ground strut (38) will provide the necessary anchorage to resist the tensile forces acting on the rail element to contain and redirect the vehicle.
- the first two posts (16a and 16b) are received at one end into the top or proximal end (90) of the unique and novel elongated foundation sleeves (20a and 20b) .
- Figs. 5 and 6 show the structure of the foundation sleeve (20a) .
- a plate of metal is bent to form the tube- like configuration of the sleeves; however, an elongated slit (92) extends along one side (94) of the sleeves from the proximal end (90) to the distal end (96) .
- a plurality of stiffing ribs (98) are formed by providing a multiplicity of 2" welds across the slit (92) along the distal two- thirds portion of the sleeve at space apart locations.
- the sleeve is provided with post retaining bolt receiving orifice (100) which allows for a bolt (102) to pass through the sleeve and through the post (16a or 16b) to retain the post in the sleeve. Further, the yoke (39) of ground strut (38) is fastened to the foundation sleeve by bolt (102) . When a post is broken off in a collision with the guardrail system (12) , the stub remaining in the sleeve may be easily removed from the sleeve by removing the bolt (102) and pulling the stub from the sleeve.
- the elongated slit (92) further facilitates the removal of a wet or swollen stub by allowing maintenance personnel to insert a tool in slit (92) and increase the opening in the proximal end of the sleeve to remove the stub.
- the unique cable release mechanism (24) serves the dual functions of: (1) transmitting the tensile force from the rail element (14a) to the lead post (16a) and the foundation sleeve (20a or 20b) via the cable anchor assembly (24) for impacts with the side of the guardrail; i.e., redirectional impacts; and (2) releasing the cable bracket (30) from the rail element (14) so that the rail element may properly feed through the impact head (50) .
- the cable release mechanism of the present invention incorporates a novel and unique cable release bracket (30) with sleeved bolts (34) .
- Figs. 7 and 8 show that cable release bracket (30) is fabricated in a manner similar to the standard cable anchor bracket by cutting angled slots (110) into the bracket.
- the leading edge of the guide tube will impact the upstream end (31) of the bracket (30) and push the bracket forward, thus releasing the bracket (30) from sleeve (120) of the mounting bolts (38) (see Fig. 9) attached to the rail element (14) .
- the rotatable sleeve (120) provides a fixed space between washer (122) and bolt head (124) .
- the cable release bracket 30 has tapered or wedged slots (110) on one side and enlarged tapered openings (112) which fit behind the mounting bolts on the opposite side.
- Fig. 8 it may be seen that the sides (132 and 134) of bracket (30) lie in two different planes. Having the tapered slot
- bracket (30) on one side and the enlarged tapered slots (112) on the other side allows the bracket to be affixed to a W-beam in two rows in two different slip planes and still be lifted off the rail element when the bracket (30) is pushed forward in a collision. Without the opposed enlarged tapered slots (112) , the bracket would not freely release from the rail element .
- the bracket (30) is attached to the rail element by specially designed sleeved bolts (34) .
- Fig. 9 illustrates that bolt (34) is provided with a head (124) and a rotatable sleeve (120) which slides over the bolt shank (121) .
- a washer or spacer (122) is welded or otherwise rigidly affixed to the shank so as to provide a fixed gap or space between the head (124) and the spacer (122) .
- the anchor cable bracket (30) slides over the rotatable sleeve (120) with the bolt (34) fitting into the appropriate slots (110 and 112) .
- the bolts (34) are affixed to the rail element (14) by passing the shank (121) through a hole or slot in the element and tightening washer (123) against the back side of the element with nut (125) . Because the fixed space between head (124) and space
- bracket (122) is greater than the thickness of the bracket, and because the bracket may easily slide over the rotatable sleeve (120) , the bracket (30) is quickly and easily released upon a head-on impact.
- the bracket is not released upon a side impact.
- FIG. 10 An alternative embodiment of an anchor cable bracket (30a) of the present invention is shown in Fig. 10.
- bracket (30a) the two side walls (132a and 134a), which lie in different planes, are provided with slots (110a and 112a) ; however, the size of the slot opening is the same.
- An extended, straight slip ceiling (Ilia) is associated with each slot.
- rotatable sleeve (120) of the sleeve bolts (34) slides along slip ceiling (Ilia) until the bolt head (124) is out of the slot (110a or 112a) , and the bracket may fall from the rail element.
- the sequential kinking mechanism of the present invention may be used in applications other than a guardrail terminal .
- Such applications include crash attenuators or cushions and truck mounted attenuators.
- Fig. 11 illustrates a crash cushion or attentuator 200 cooperatively mounted to a concrete head wall (202) .
- -As will be understood from the previous discussion of the guardrail system
- an impact head (204) having two separate inlets (200 and 208) , two separate outlets (210 and 212) , two separate kinking beams (214 and 216) , two separate kinking deflector plates (218 and 220) , and two separate post breaker beams (222 and 224) may be used to sequentially kink two separate rail elements (226 and 228) .
- the leading ends (230 and 232) of the rail elements may be connected to improve the controlled discharge of the kinked elements .
- downstream ends (234 and 236) of the rail elements may be affixed to an end plate (238) and mounted to a truck (249) by mounting brackets or cylinders (260) to provide a truck attentuator (262) .
- Fig. 12 illustrates such an arrangement.
- Fig. 12 further illustrates how a third inlet (242), outlet (244) , kinking beam (246) , and kinking deflector plate (248) , may be used to sequentially kink a third rail element (250) .
- a third inlet (242), outlet (244) , kinking beam (246) , and kinking deflector plate (248) may be used to sequentially kink a third rail element (250) .
- no post breaker beams are necessary.
Abstract
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP98908859A EP1015699B1 (en) | 1997-04-02 | 1998-03-03 | Sequential kinking guardrail terminal system |
CA002285217A CA2285217C (en) | 1997-04-02 | 1998-03-03 | Sequential kinking guardrail terminal system |
NZ337858A NZ337858A (en) | 1997-04-02 | 1998-03-03 | Crash attenuation impact head and highway crash attenuation system including a kinking deflector plate |
AT98908859T ATE264433T1 (en) | 1997-04-02 | 1998-03-03 | END PIECE FOR A SUCCESSIVE BUCKLING GUARDRAIL |
DE69823213T DE69823213D1 (en) | 1997-04-02 | 1998-03-03 | CLOSING PIECE FOR A FOLLOWING BENDING GUIDE |
AU66787/98A AU724157B2 (en) | 1997-04-02 | 1998-03-03 | Sequential kinking guardrail terminal system |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/832,422 | 1997-04-02 | ||
US08/832,422 US5775675A (en) | 1997-04-02 | 1997-04-02 | Sequential kinking guardrail terminal system |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1998044203A1 true WO1998044203A1 (en) | 1998-10-08 |
Family
ID=25261599
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US1998/004063 WO1998044203A1 (en) | 1997-04-02 | 1998-03-03 | Sequential kinking guardrail terminal system |
Country Status (8)
Country | Link |
---|---|
US (3) | US5775675A (en) |
EP (1) | EP1015699B1 (en) |
AT (1) | ATE264433T1 (en) |
AU (1) | AU724157B2 (en) |
CA (1) | CA2285217C (en) |
DE (1) | DE69823213D1 (en) |
NZ (1) | NZ337858A (en) |
WO (1) | WO1998044203A1 (en) |
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2005028757A1 (en) * | 2003-09-22 | 2005-03-31 | Armorflex Limited | Guardrail |
US7111827B2 (en) | 1994-11-07 | 2006-09-26 | Kothmann Enterprises, Inc. | Energy-absorption system |
US7396184B2 (en) | 2004-09-15 | 2008-07-08 | Energy Absorption Systems, Inc. | Crash cushion |
US7950870B1 (en) | 2008-03-28 | 2011-05-31 | Energy Absorption Systems, Inc. | Energy absorbing vehicle barrier |
US8074761B2 (en) | 2008-01-07 | 2011-12-13 | Energy Absorption Systems, Inc. | Crash attenuator |
US8215619B2 (en) | 2009-03-31 | 2012-07-10 | Energy Absorption Systems, Inc. | Guardrail assembly, breakaway support post for a guardrail and methods for the assembly and use thereof |
US8424849B2 (en) | 2008-06-04 | 2013-04-23 | Axip Limited | Guardrail |
US8596617B2 (en) | 2006-11-06 | 2013-12-03 | Axip Limited | Impact energy dissipation system |
US8864108B2 (en) | 2007-06-01 | 2014-10-21 | Valmont Highway Technology Limited | Barrier section connection system |
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- 1998-03-03 NZ NZ337858A patent/NZ337858A/en not_active IP Right Cessation
- 1998-03-03 EP EP98908859A patent/EP1015699B1/en not_active Expired - Lifetime
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US8915486B2 (en) | 2006-05-04 | 2014-12-23 | Valmont Highway Technology Limited | Releaseable anchor cables for cable barriers that release upon certain load conditions upon the cable barrier |
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US8215619B2 (en) | 2009-03-31 | 2012-07-10 | Energy Absorption Systems, Inc. | Guardrail assembly, breakaway support post for a guardrail and methods for the assembly and use thereof |
US8360400B2 (en) | 2009-03-31 | 2013-01-29 | Energy Absorption Systems, Inc. | Guardrail assembly, breakaway support post for a guardrail and methods for the assembly and use thereof |
Also Published As
Publication number | Publication date |
---|---|
US6109597A (en) | 2000-08-29 |
US5775675A (en) | 1998-07-07 |
US5924680A (en) | 1999-07-20 |
AU724157B2 (en) | 2000-09-14 |
CA2285217A1 (en) | 1998-10-08 |
EP1015699A4 (en) | 2002-08-14 |
CA2285217C (en) | 2001-08-14 |
EP1015699A1 (en) | 2000-07-05 |
AU6678798A (en) | 1998-10-22 |
EP1015699B1 (en) | 2004-04-14 |
ATE264433T1 (en) | 2004-04-15 |
DE69823213D1 (en) | 2004-05-19 |
NZ337858A (en) | 2000-03-27 |
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