WO2017102671A1 - Système de barrière routière, montant et support destinés à un tel système de barrière - Google Patents

Système de barrière routière, montant et support destinés à un tel système de barrière Download PDF

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Publication number
WO2017102671A1
WO2017102671A1 PCT/EP2016/080710 EP2016080710W WO2017102671A1 WO 2017102671 A1 WO2017102671 A1 WO 2017102671A1 EP 2016080710 W EP2016080710 W EP 2016080710W WO 2017102671 A1 WO2017102671 A1 WO 2017102671A1
Authority
WO
WIPO (PCT)
Prior art keywords
post
bracket
barrier system
rail
slot
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/EP2016/080710
Other languages
English (en)
Inventor
Andrew Jonathan Clough
Steven Charles Sirman
Andrew Thomas Blowey
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tata Steel UK Ltd
Original Assignee
Tata Steel UK Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Tata Steel UK Ltd filed Critical Tata Steel UK Ltd
Priority to EP16808715.3A priority Critical patent/EP3390726B1/fr
Publication of WO2017102671A1 publication Critical patent/WO2017102671A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • E01F15/0461—Supports, e.g. posts

Definitions

  • the invention relates to a road barrier system and a post for such a system, more in particular to a bridge parapet system, a post for such bridge parapet designed to have a limited deflection when an errant vehicle crashes into the barrier system and a bracket for such post.
  • the new road barrier system should preferably be designed such that the mounting points of the previous safety fence can be used without having to make additional mounting points. Another important point is, especially for bridge parapets, that the deflection of the barrier system with a vehicle crashing into the barrier system stays within certain limits. This also applies for parts of other barrier systems that are close to constructions or adjacent pedestrian ways. Moreover, the new road barrier system, which especially is of importance for bridge parapets, should preferably not have an increased wind loading compared to that of the old safety fence. Objectives of the invention
  • the invention relates to a barrier system as defined in claims 1 -13, a post for a barrier system as defined in claims 14-15 and a bracket for a post for a barrier system as defined in claims 16-18.
  • a barrier system is provided with a plurality of posts, wherein a post comprises a section secured to a base plate, and one or more rails attached to the posts and wherein one or more of the posts are provided with a weakened zone in the section to enable deformation in a predetermined way.
  • a post for a barrier system with a weakened zone is disclosed in EP2305890, wherein the post has a strong direction with high mechanical strength and a weak direction, with the strong direction oriented perpendicular to the rail.
  • a post for a barrier system yields at the base of the post on impact of an errant vehicle into the barrier system which, especially with vehicles of larger size and mass, results in that the post will deflect in a direction transverse to the rail of the barrier system to outside the working width.
  • the post With a weakened zone according to the invention the post is provided with an extra hinge point which allows the post to hinge at the connection with the base plate and higher up along the post in the weakened zone. The result is that on impact is that the post hinges at the base plate and higher up in the weakened zone in opposite directions. It will also allow the post to absorb higher levels of energy while remaining within the required working width.
  • the weakened zone comprises at least one slot in the length direction of the hollow section.
  • a weakened zone could be made in various ways, for example by providing a zone with reduced wall thickness, such as a groove. The easiest manner to provide a zone with reduced wall thickness is to provide a cut through the wall of the post.
  • slot will be used which will mean that a strip of a certain width and length has been removed from the section, that a "groove” has been made in the section which does not extend through the entire thickness of the section, and that a "cut” and or “slot” in the section has been made in the section which extends through the entire thickness of the section.
  • the length direction of the section comprises all directions within a certain range around parallel to the length direction, wherein the range is up to and including 20° on both sides of the parallel direction.
  • the width of a slot is in a range from the width of a laser cut to a width of 50mm, preferably up to a width of 25mm. A larger width of the slot would require two cuts which can be parallel or at an angle to each other.
  • a post with a slot where opposite parts of the slot butt against each other, a slot with zero width, but that is not very practical.
  • the weakened zone comprises two slots in the length direction of the hollow section opposite to each other. These slots are made at opposite sides of the post such that the post can deform in a direction transverse to the rails. With a rectangular section the slots are made in the sides directly connecting to the front side of the post to which the rails are attached.
  • Another way of providing such a slot would be to make a hollow section by welding together two channel sections, flange to flange.
  • the slot is a discontinuity in the weld.
  • the slots extend over a certain length and height of the post. At the lower side the slot extends preferably to the lower end of the post where it is secured to the base plate.
  • the hollow section is secured to the base plate for instance by means of welding. With a slot extending to the lower end of the hollow section, the slot provides a crack stopping mechanism at the joint between the hollow section of the post and the base plate. This crack stopping behaviour reduces the likelihood of the hollow section of the post detaching from the base plate upon impact of an errant vehicle.
  • a slot ends in a hole at the upper end of the slot.
  • This hole provides for an optimisation of the post yielding sequence on impact and acts as a stress reliever and prevents unwanted splitting of the post.
  • the hole can have various shapes but most practical is to provide a circular hole.
  • the diameter or else the largest size of such a hole can be up to 75mm, for a 100mm wide post, with the smallest size being larger then the width of the slot.
  • a hole with a diameter in the range of 6-50mm, preferably 12-40mm will be sufficient.
  • the section is a hollow section.
  • the barrier system comprises a rail positioned above the upper end of the slot.
  • the wording "above the upper end of the slot” either means above the upper end of the slot or above the hole at the upper end of the slot whichever applies.
  • the barrier system comprises a first and a second rail attached to the posts with at least the second rail positioned above the upper end of the slot.
  • first rail is preferably below the upper end of the slot.
  • the first rail is positioned such that an errant vehicle will hit the rail at wheel level and because that is between the base plate and the hole at the upper end of the slot this part of the post allows for the largest deflection.
  • second rail above the hole at the upper end of the slot the part of the post above the hole will remain pretty much in an upright position or with minimal deflection.
  • At least one of the rails is attached to a post by means of a deformable bracket.
  • a deformable bracket part of the impact energy is absorbed by the bracket by yielding and buckling of the bracket resulting in that less of the impact energy has to be absorbed by the post.
  • the first rail is attached to a post by means of a bracket designed to move the first rail on deformation upward in direction of the post.
  • the bracket of the first rail is provided with a lower arm and an upper arm, wherein the lower arm extends from the post below the position of the first rail to the rail and is provided with a non- yielding part between end parts of the lower arm.
  • the non-yielding part of the lower arm will not buckle on impact whereas the end parts with which the lower arm connects to respectively the post and the first rail will be deformed therewith rotating the first rail upward and in the direction of the post.
  • the lower arm of the bracket comprises a strip provided with flanges over part of the length of the strip as the non- yielding part of the lower arm.
  • the end parts of the strip are free of such flanges or swages.
  • a strip with flanges a channel or box section, or a swaged section could be used with strip lugs as the and parts.
  • the upper arm of the bracket comprises a pre-bent strip, designed to absorb part of the impact energy.
  • the second rail is attached to the post with a deformable bracket.
  • a deformable bracket is a pre-bent bracket with at least one pre-bent arm extending from the rail to the post.
  • the bend in the arm or arms determines in which direction the pre-bent arm will be displaced on impact of an errand vehicle.
  • the bend in the bracket of the second rail is preferably applied such that part of the displacement of the pre-bent arm is also in upward direction.
  • the barrier system is provided with a third rail attached to the barrier post above the second rail.
  • This third rail can be attached directly to the posts or with a short U-bracket extending over a limited distance from the post.
  • the bracket of the third rail is not designed to take up a substantial part of the impact energy as the first and second rail do and serves to protect pedestrians and/or to prevent a tall vehicle like a coach vault the barrier system.
  • the third rail contributes in keeping the part of the post above the slot and hole in a substantially vertical position, which because of the direct or almost direct mounting against the post is a substantial contribution.
  • the top of the barrier post is chamfered wherein the chamfer inclines from top down to the side of the post opposite to the side of the post to which the rails are attached.
  • the chamfer helps to minimize the deflection in as far as the part of the post deflects from the vertical.
  • a post for a road barrier system with one or more rails, comprising a section secured to a base plate wherein the section is provided with a weakened zone to enable deformation in a predetermined way, wherein the section is a hollow section and wherein the weakened zone comprises two slots in the length direction of the hollow section opposite to each other and wherein a slot ends in a hole at the upper end of the slot.
  • the opposite slots are at the sides of the post turned away from the road such that deformation of the post is in a direction at about a right angle to the length direction of the road.
  • the post is provided with a first and a second bracket for a first and a second with the bracket for the first rail below the upper end of the slot and with the bracket for the second rail positioned above the upper end of the slot.
  • a bracket for the post, wherein the bracket comprises a mounting portion to mount the bracket to a post, a lower arm and an upper arm, wherein the lower arm extends from the mounting portion in upward direction when mounted to the post and wherein the lower arm is provided with a non- yielding part between end parts of the lower arm.
  • the non-yielding part of the lower arm of the bracket could for example comprise a strip provided with flanges over part of the length of the strip as the non-yielding part of the lower arm.
  • fig.1A shows a post for a barrier system without rails
  • fig.1 B shows a post for a barrier system with brackets and rails
  • fig.2A,B,C shows successive stages in deformation of a post for a barrier system.
  • a post 1 for a barrier system is shown before attachment of rails and brackets.
  • the post 1 is secured to a base plate 2 and the base plate 2 is mounted to a structure 3 for instance to a bridge structure.
  • the post 1 is a hollow rectangular section that is welded to the base plate 2.
  • a welded connection proved to be a strong enough connection between the post and base plate for this purpose.
  • the base plate 2 is preferably mounted to the structure with bolts, preferably with high performance mounting bolts.
  • the post 1 is provided with a slot 4 which runs from the base plate 2 to a hole 5 in the side of the post 1.
  • the post 1 On the opposite side the post 1 is provided with a slot and a hole in a corresponding position and of the same size.
  • the holes 5 on opposite sides provide hinge points around which the post will yield when the barrier is hit by an errant vehicle.
  • the holes 5 will relieve at least part of the stress in the post on deformation therewith preventing the splitting of the post 1.
  • Fig.l B shows post 1 provided with rails 6, 7 and 8 which are mounted by means of brackets 9, 10 and 11 to the post 1.
  • the brackets 9, 10 keep the first and second rails 6 and 7 at a distance from the post 1 which is considerable larger than the distance between the upper rail 8 and the post.
  • Bracket 9 has a lower arm 12 and an upper arm 13, wherein the lower arm 12 is provided with a non-yielding part 14 between end parts of the lower arm 12 and wherein the upper arm 13 is pre-bent.
  • the angle between the lower arm 12 and the post 1 is an acute angle with the lower arm 12 extending upward from the post.
  • the upper arm 13 of bracket 9 is pre-bent in order to deform when a pre-determined stress is exceeded.
  • the bend in the upper arm is such that the arm will give way in upward direction.
  • the bracket 10 of the second rail 7 has a lower arm 15 and an upper arm 16 which are both pre-bent also in order to deform when a pre-determined stress is exceeded. Both the lower and upper arm 15, 16 are pre-bent such that on deformation the bend in the lower and upper arm 15, 16 move upward. This prevents that the rotation of bracket 9 with first rail 6 is obstructed on simultaneous deformation or about simultaneous deformation of bracket 9 and bracket 10.
  • first part 17 of upper arm 16 encloses an acute angle with post 1 with the first part 17 extending in upward direction.
  • the second part 18 of the arm 16 is at an angle with the first part 17 of the arm 16 which is less than 180° from this side view.
  • first part 17 is at least equal to that of the second part 18 but preferably longer.
  • the upper and lower arm 15, 16 are parallel or about parallel to each other.
  • the upper arm 13 of bracket 9 is the same or about the same as those of bracket 10.
  • brackets 9, 10 and the mounting distance between these brackets allow a free rotation of the non-yielding part 14 of lower arm 12 around the mounting point of the lower arm to the post 1.
  • the bracket 10 with the second rail 7 are mounted above the hole 5 above the end of the slot.
  • the brackets 9, 10 are mounted against the post 1 through mounting portions between the respective lower and upper arms.
  • the upper rail 8 is mounted with a U-bracket 1 1 and is close to the post 1 .
  • Fig.2B has started to yield at the base plate 2 and at the level of hole 5 in the post, indicated with arrows 20. At the same time the slot 4 and hole 5 allow shearing as indicated with arrows 21 along the slot 4.
  • Fig.2C shows a final deformation stage wherein the yield and shear as indicated in fig.2B with arrows 20 and 21 have increased considerably.
  • the lower part 22 of the post up to the hole 5 has been deformed such that it deflects over a far larger angle from the upright position than the upper part 23 of the post.
  • the difference is such that the upper part of the post only deviates over only a small angle with respect to the original upright position.
  • the post is provided with a chamfer 24 which further reduces the actual working width after deformation.

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Body Structure For Vehicles (AREA)

Abstract

La présente invention concerne un système de barrière routière similaire à un parapet de pont et comprenant une pluralité de montants, l'un des montants comportant une section creuse fixée à une plaque de base, un ou plusieurs rails étant fixés aux montants, et un ou plusieurs des montants étant pourvus d'une zone affaiblie dans la section creuse afin de permettre une déformation prédéterminée du montant en cas d'impact d'un véhicule errant.
PCT/EP2016/080710 2015-12-17 2016-12-13 Système de barrière routière, montant et support destinés à un tel système de barrière Ceased WO2017102671A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP16808715.3A EP3390726B1 (fr) 2015-12-17 2016-12-13 Système de barrière de route

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP15200932 2015-12-17
EPEP15200932.0 2015-12-17

Publications (1)

Publication Number Publication Date
WO2017102671A1 true WO2017102671A1 (fr) 2017-06-22

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2016/080710 Ceased WO2017102671A1 (fr) 2015-12-17 2016-12-13 Système de barrière routière, montant et support destinés à un tel système de barrière

Country Status (1)

Country Link
WO (1) WO2017102671A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040007654A1 (en) * 2002-07-11 2004-01-15 Peter Vega Breakaway sign stand
ES1071317U (es) * 2009-11-03 2010-02-12 Industrias Duero, S.A. Estructura de contencion de impactos laterales de vehiculos en carreteras.
EP2305890A2 (fr) 1997-05-09 2011-04-06 Trinity Industries, Inc. Poteau de support à mécanisme de rupture pour les extrémités de rail de glissière de sécurité d'autoroute
EP2455546A1 (fr) * 2010-11-09 2012-05-23 Volkmann & Rossbach GmbH & Co. KG Agencement de poteau pour une construction de glissière de sécurité et construction de glissière de sécurité pour sécuriser des bandes de roulement sur des chantiers
WO2013164097A1 (fr) * 2012-05-03 2013-11-07 Tata Steel Uk Limited Barrière de sécurité et poteau pour barrière de sécurité

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2305890A2 (fr) 1997-05-09 2011-04-06 Trinity Industries, Inc. Poteau de support à mécanisme de rupture pour les extrémités de rail de glissière de sécurité d'autoroute
US20040007654A1 (en) * 2002-07-11 2004-01-15 Peter Vega Breakaway sign stand
ES1071317U (es) * 2009-11-03 2010-02-12 Industrias Duero, S.A. Estructura de contencion de impactos laterales de vehiculos en carreteras.
EP2455546A1 (fr) * 2010-11-09 2012-05-23 Volkmann & Rossbach GmbH & Co. KG Agencement de poteau pour une construction de glissière de sécurité et construction de glissière de sécurité pour sécuriser des bandes de roulement sur des chantiers
WO2013164097A1 (fr) * 2012-05-03 2013-11-07 Tata Steel Uk Limited Barrière de sécurité et poteau pour barrière de sécurité

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