WO2007144656A1 - Barrières de sécurité pour véhicules - Google Patents

Barrières de sécurité pour véhicules Download PDF

Info

Publication number
WO2007144656A1
WO2007144656A1 PCT/GB2007/002251 GB2007002251W WO2007144656A1 WO 2007144656 A1 WO2007144656 A1 WO 2007144656A1 GB 2007002251 W GB2007002251 W GB 2007002251W WO 2007144656 A1 WO2007144656 A1 WO 2007144656A1
Authority
WO
WIPO (PCT)
Prior art keywords
rail
anchor
section
safety barrier
upright
Prior art date
Application number
PCT/GB2007/002251
Other languages
English (en)
Inventor
Michael Richard Lawrence
Christophe Bastien
Martin Jeffrey Batchelor
Harold Lewis Collins
Aled Mon Roberts
Original Assignee
Corus Uk Limited
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 Corus Uk Limited filed Critical Corus Uk Limited
Publication of WO2007144656A1 publication Critical patent/WO2007144656A1/fr

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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
    • E01F15/14—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
    • 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

Definitions

  • the present invention relates to vehicle safety barriers.
  • Vehicle safety barriers for road use typically comprise one or more horizontal rails supported by posts spaced along the roadside. If a vehicle leaves the roadway for some reason, it impacts the rail and is restrained. Such barriers are a common sight on roads (etc) and are often referred to generically as "Armco".
  • barriers are used extensively where there are sensitive or dangerous structures or areas near to the roadway.
  • An example is a support for a bridge over the roadway; if a vehicle were to leave the roadway and impact the bridge support then a potentially serious incident could result.
  • a barrier serves to deflect the vehicle away from a course that would otherwise result in an impact.
  • the present invention therefore provides an anchor for a vehicle safety barrier, comprising first and second uprights, bracing between the uprights, and a deflector bar extending from the first upright to the second and beyond by a distance of at least half the spacing between the uprights, i.e. the gap between the uprights excluding the thickness of the uprights themselves. It preferably extends beyond the second upright by a distance of at least half the distance between the outer faces of the uprights, i.e including the thickness of the uprights. More preferably, it extends beyond by a distance equal to the distance between the outer faces of the uprights.
  • the anchor is in fact a potential risk point.
  • Vehicles that impact at or shortly before the anchor meet what is in effect a rigid object in their path.
  • the deflector bar makes contact with the lower structures of the impacting vehicle, such as the wheels and suspension, and uses these to deflect the vehicle away from the rigid anchor.
  • the anchor of the present invention can be employed as a generic termination to a length of safety barrier.
  • the bracing comprises at least one inclined strut extending between the uprights.
  • the inclined strut can extend upwardly from the first upright to the second upright; in this way it is best able to withstand forces in the rail that are transferred to the anchor, while minimising the overall height of the anchor.
  • the deflector bar can be a length of W-section rail, preferably reinforced as described below.
  • one of the uprights is provided with a bracket for attaching a barrier rail, the bracket comprising an attachment means for accepting the rail at an acute angle to the anchor and a spacer element between the rail and the anchor.
  • the attachment means can absorb longitudinal forces in the rail, while the spacer element can resist rotation of the rail about its point of attachment to the anchor.
  • the spacer element can be a hollow section such as a trapezoidal section. It is preferably located between the rail and the bracing.
  • the attachment means (or part of it) can also extend between the spacer element and the rail, so that the spacer element is crushed between the attachment means and the anchor bracing.
  • a truss can extend from the rail to the anchor or to ground, to assist further in stabilising the barrier under impact.
  • the present invention also provides a vehicle safety barrier, comprising a length of rail supported by posts and connected at its end to an anchor as defined above.
  • the rail is preferably connected to the second upright, more preferably with the anchor oriented generally alongside the rail. This offers the required ability of the anchor to absorb forces and moments in the rail resulting from a vehicle impacting the rail nearby.
  • the anchor is oriented such that the line defined by the first and second uprights is at an acute angle to the line defined by the posts, and also that the rail extends past the first upright to the second upright.
  • the first and the second uprights will ideally be positioned behind the line defined by the posts.
  • the end of the rail can also be angled inwardly relative to the posts.
  • the rail is preferably a W section.
  • This can be reinforced, at least in its end section. Reinforcement allows the rail to exert a greater returning force on a vehicle to deflect its path away from the anchor with greater urgency.
  • a suitable reinforcement for both the rail and for a W-section deflector bar comprises a length of C-section behind the W-section, such that the free edges of the C-section extend into the two recesses of the rear of the W-section. This is particularly straightforward to manufacture and to install.
  • the central peak at the rear of the W section can sit in the channel defined by the C section and the two can be attached to a post using the same fixing. No further join need be provided, although the two could evidently be welded or otherwise joined along their length if this were felt worthwhile.
  • Figure 1 shows a perspective view of a vehicle safety barrier including an anchor according to the present invention
  • Figure 2 shows the barrier of figure 1 from above
  • Figure 3 shows the barrier of figure 1 from behind
  • Figure 4 shows the anchor of figure 1 from the front
  • Figure 5 shows a perspective view of the anchor
  • Figure 6 shows the reinforcement of a W-section
  • Figure 7 is a perspective view of the joint between the anchor and the rail
  • Figure 8 is a view from above of the joint between the anchor and the rail;
  • Figures 9 to 11 show end, top and perspective views (respectively) of the bracket responsible for that joint.
  • Figure 12 shows an alternative bracket.
  • FIG. 1 shows a safety barrier termination according to the present invention. This is described and claimed in our two copending applications filed simultaneously with this application and entitled “Vehicle Safety Barriers” and “Rail for Vehicle Safety Barriers”, and the disclosures of which is hereby incorporated by reference.
  • a standard W-section safety barrier 10 is shown, which consists of a W-section rail 12 supported by posts 14. Each post 14 is set into a socket 16 that is embedded in to the ground surface 18; other means of securing the posts are also known, such as driving the socket directly into the ground.
  • the barrier 10 needs to be terminated prior to an obstruction in the form of a vertical concrete block 20.
  • the design parameters for the termination shown in figure 1 were that it should not intrude or otherwise be supported by the vertical concrete block 20.
  • the result is a safety barrier termination which does not rely in any way upon support provided by the obstruction 20 in order to meet the necessary testing requirements.
  • a vehicle impacting the barrier within the parameters of the test requirements will be guided to safety without impacting the obstruction 20.
  • the obstruction 20 could be replaced with any other form of barrier or obstruction.
  • validation of this design will enable it to be used as a termination for a new or existing W-section barrier at an interface with any other form of barrier or parapet.
  • the principles of this invention can be applied to terminate any other form of vehicle safety barrier prior to an obstruction or interface.
  • the termination 21 consists of first upright 22 and second upright 24, both formed of l-section struts. When viewed in the direction of traffic flow 26, the first upright 22 is before the second upright 24.
  • a bracing structure 28 is provided between the first and second upright 22, 24, and consists of an inclined box section running between the l-section uprights, from a low point at its connection with the first upright 22 to a highest point at its connection with the second upright 24. Other sections such as C- or l-sections could also be used. Given that (as will be explained later) most forces and moments exerted on the termination 21 will be applied via the second upright 24, the inclining of the bracing structure 28 assists in absorbing these forces.
  • the fact that the bracing structure 28 attaches to the first upright 22 at a relatively low height means that the first upright 22 can be relatively short, shorter than the second upright 24. Given that approaching vehicles meet the first upright 22 early, this can improve the impact profile of the termination 21.
  • a deflector (or “kicker") bar 30 extends from the first upright 22 to the second 24 and beyond, and is held in place at securing points on each upright.
  • the deflector bar 30 is generally positioned at a level slightly above ground level 18 affixed at the top of the first upright 22. It extends generally alongside the direction of travel 26, past the front of the second upright 24 and in front of the vertical concrete block 20. In total, the length by which the deflector bar extends beyond the second upright, alongside the vertical concrete block 20, is slightly more than the distance between the external faces of the uprights, i.e. the spacing of the uprights including their thicknesses.
  • the total length of the deflector bar is dictated by the context of the anchor.
  • a shorter deflector bar such as the length between the internal sides of the uprights (i.e. their spacing not including their widths), or one half of the spacing (on either basis) might be useful in other situations.
  • Figure 1 also shows that the W-section rail of which the deflector bar 30 is formed and later sections 32 of the W-section rail 12 forming a part of the safety barrier 10 are reinforced with a C-section reinforcement 34. This will be described in more detail later.
  • Figure 2 shows the safety barrier 10 and termination 21 from above. It can be seen that the front face of the safety barrier 10 that is to be terminated defines a straight line 36, and that the termination structure 21 is located entirely behind that line. Furthermore, the first upright 22 is situated further back than the second upright 24 so that, from the point of view of an approaching vehicle moving in the direction of the assumed traffic flow 26, the termination structure 21 is tilted slightly to face the traffic. The fact that the termination structure 21 is set back behind the front face of the barrier 36 means that the rail 12 can continue past the first upright 22 and then, via a small kink 38 be bought back for connection to the second upright 24.
  • a small kink 40 in the deflector bar 34 allows one end of the. deflector bar to be positioned alongside the first and second upright 22, 24 and the remaining length of the deflector bar 34 to be alongside the vertical concrete block 20. This is assumed to be parallel to the front face of the safety barrier 36 and set back therefrom, in line with the requisite standards for the safety barrier 10.
  • Figure 3 shows barrier 10 and the termination structure 21 from the rear, and it can be seen that the deflector bar 34 is located generally below the barrier rail 12. Thus, in the event of a vehicle impacting the barrier in this general area, the deflector bar 34 can provide an additional point of contact with the vehicle to deflect it forwards and away from the vertical concrete block 20.
  • Figure 4 shows a corresponding view from the front.
  • Figure 5 shows the termination structure 21 standing alone, without the accompanying safety barrier 10. Together with figure 6, it shows in more detail the nature of the W-section deflector bar 30 which, viewed from a front face 42, has two protruding ridges 44, 46 between which there is a defined valley 48.
  • a C-section reinforcement 34 is disposed behind the W-section rail 30 with the open part of the C- profile receiving the valley 48.
  • the two edges of the C-section 34 extend into the W-section behind the ridges 44, 46.
  • This can be secured to the W-section rail without any further apparatus.
  • a W-section is secured to posts by a bolt which passes through a slot formed in the valley 48.
  • a corresponding slot at the centre of the C-section 34 can receive the same bolt, which will then retain both profiles in place. No welding or other fastenings are (strictly) necessary, allowing galvanised profiles to be used without difficulty.
  • a vehicle that impacts the safety barrier 10 some distance from the termination structure 21 will generally bend or deform the posts 14 and deflect the rail 12 backwards away from the vehicle carriageway. As it does so, the rail 12 is stretched and the tension therein exerts a force on the vehicle restoring it towards the carriageway. Friction between the side of the vehicle and the rail 12 also decelerates the vehicle, and these two factors together therefore restrain its rate of departure from the carriageway. This effect relies on there being a tensile force in the rail 12.
  • the termination structure 21 should provide an anchor point to exert the necessary tensile force in the rail 12 at locations further back along the safety barrier 10.
  • the termination structure 21 needs to resist rotation of the rail 12, as a free rotation about the end point will allow the rail 12 to deform excessively under impact.
  • the vehicle may meet the termination structure 21.
  • the deflector bar 34 will provide an additional point of contact with a vehicle below the rail 12, and will exert a still greater restoring force on the vehicle to return it towards the carriageway and arrest its motion towards the vertical concrete block 20. Whilst it is, in general, preferable to minimise the forces exerted on the vehicle, at the end of the rail 12 this is outweighed by the need to deflect the vehicle away from the vertical concrete block 20.
  • FIGS 7 to 11 show the connection between the anchor 22 and the barrier rail 12 in more detail.
  • the rail 12 connects to the second upright 24 via a bracket 50 shown separately in figures 9 to 11 , figure 9 being a view along the direction of arrow IX in figure 10.
  • This has an C-section 52 comprising a vertical backplate 54 and upper and lower plates 56, 58 (respectively).
  • On the rear of the backplate 54 i.e. extending in the opposite direction to the upper and lower plates 56, 58), a trapezoidal section 60 is attached to the C-section 52.
  • This is a generally box-shaped section albeit with one side narrower than the opposing side.
  • the sides connecting these are (in this example) non-parallel. It is attached to the backplate 54 via one of the non-parallel sides, with the edge between that side and the longer parallel side aligned with the open edge of the backplate 54.
  • the remaining open edge of the C-section 52 is chamfered along a line that is generally aligned with the remaining non-parallel side of the trapezoidal section 60.
  • the backplate 54 is essentially cut short and the upper and lowerplates 56, 58 have triangular extensions.
  • the space thus created adjacent the backplate 54 is closed off with a connection plate 62.
  • Figures 7 and 8 show how the bracket is fitted.
  • the connection plate 62 is attached to the second upright 24 at the level of the rail 12, with the C-section 52 extending back along the path of the rail 12.
  • the size of the C-section 52 corresponds to that of the reinforcement 34 behind the rail 12 such that the C-section 52 fits outside the reinforcement and can be connected to it by welding, bolting, etc. This connects the rail 12 (via the reinforcement 34) to the second upright 24.
  • the trapezoidal section 60 is then located between the reinforcement 34 and the bracing structure 28, as the chamfer to the C-section 52 is aligned with the edge of the trapezoid. A small clearance may exist between them of, say 2-15mm.
  • the rail 12 and reinforcement 34 are likely to be subject to forces tending to cause rotation at the point where they are connected to the anchor 21. If unconstrained, this rotation will allow the rail 12 to buckle and allow the vehicle to escape too far from the roadway.
  • trapezoidal section 60 will then be trapped between the reinforcement 34 and the bracing structure 28, and will serve to constrain the reinforcement 34 and hence the rail 12 against further rotation.
  • the degree of resistance offered by the trapezoidal section 60 can be tailored by adjusting the wall thickness, material strength, precise wall shapes, section profile, etc.
  • Figure 12 shows a slightly modified bracket 50'. It differs in that the trapezoidal spacer 60' is solid instead of being hollow in section. This means that the spacer will be correspondingly less willing to deform under an impact, causing the bracket to offer greater resistance to rotational forces in the rail. In this way, and/or by changing the cross-sectional shape of the bracket, the action of the anchor under impact can be tailored to the requirements of the intended installation site.

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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

La présente invention concerne un ancrage pour une barrière de sécurité pour véhicules, cet ancrage comprenant des premier et second montants, un renfort entre les montants et une barre de déviation s'étendant entre le premier et le second montant et au-delà d'une distance d'au moins la moitié de l'espacement entre les montants. En prolongeant la barre de déviation au-delà du second montant, on obtient un ancrage qui permet de dévier un véhicule entrant en collision (dans les limites de trajectoire/vitesse de la norme concernée) le long d'une trajectoire face à l'ancrage sans que cela dépende aucunement d'autres structures. L'ancrage de la présente invention peut donc être utilisée comme une extrémité ordinaire d'une longueur de barrière de sécurité. Le renfort peut comprendre au moins un étai incliné s'étendant entre les montants. La barre de déviation peut être une longueur de rail présentant une section en W, de préférence renforcée. Le rail à section en W de la barre de déviation ou le rail de la barrière de sécurité peut être renforcé avec une longueur de section en C derrière la section en W de sorte que les bords libres de la section en C s'étendent dans les deux renfoncements de l'arrière de la section en W. Le pic central situé à l'arrière de la section en W peut reposer dans le canal défini par la section en C et les deux peuvent être fixés à un poteau à l'aide de la même fixation.
PCT/GB2007/002251 2006-06-13 2007-06-15 Barrières de sécurité pour véhicules WO2007144656A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0611624A GB2439079B (en) 2006-06-13 2006-06-13 Vehicle safety barriers
GB0611624.8 2006-06-13

Publications (1)

Publication Number Publication Date
WO2007144656A1 true WO2007144656A1 (fr) 2007-12-21

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ID=36745761

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2007/002251 WO2007144656A1 (fr) 2006-06-13 2007-06-15 Barrières de sécurité pour véhicules

Country Status (2)

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GB (1) GB2439079B (fr)
WO (1) WO2007144656A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11891765B2 (en) 2022-05-19 2024-02-06 Vandorf BT1 Inc. Barrier transition framework

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1966778A (en) * 1933-09-05 1934-07-17 Jr Robert J Woods Road guard for highways
US5391016A (en) * 1992-08-11 1995-02-21 The Texas A&M University System Metal beam rail terminal
US5931448A (en) * 1995-12-28 1999-08-03 The Board Of Regents Of The University Of Nebraska Reverse twist turned-down terminal for road guardrail systems
US20010048101A1 (en) * 1999-12-17 2001-12-06 Bligh Roger P. Apparatus and methods for strengthening guardrail installations
EP1382748A2 (fr) * 2002-07-16 2004-01-21 METALMECCANICA FRACASSO S.p.A. Terminaison d'une glissière de sécurité
DE10231903A1 (de) * 2002-07-11 2004-02-05 Innotraffic.Net Gmbh Leitelement für den Anfangs- oder Endbereich einer Leitplanke oder eines Leitplankensystems an Verkehrswegen
EP1627956A1 (fr) * 2004-08-16 2006-02-22 SPIG Schutzplanken-Produktions-Gesellschaft mbH & Co.KG Glissière de sécurité routière

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4330106A (en) * 1979-05-02 1982-05-18 Chisholm Douglas B Guard rail construction
CA2454554C (fr) * 2001-07-20 2009-06-16 Texas A & M University System Elements d'extremite de glissiere de securite en caissons

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1966778A (en) * 1933-09-05 1934-07-17 Jr Robert J Woods Road guard for highways
US5391016A (en) * 1992-08-11 1995-02-21 The Texas A&M University System Metal beam rail terminal
US5931448A (en) * 1995-12-28 1999-08-03 The Board Of Regents Of The University Of Nebraska Reverse twist turned-down terminal for road guardrail systems
US20010048101A1 (en) * 1999-12-17 2001-12-06 Bligh Roger P. Apparatus and methods for strengthening guardrail installations
DE10231903A1 (de) * 2002-07-11 2004-02-05 Innotraffic.Net Gmbh Leitelement für den Anfangs- oder Endbereich einer Leitplanke oder eines Leitplankensystems an Verkehrswegen
EP1382748A2 (fr) * 2002-07-16 2004-01-21 METALMECCANICA FRACASSO S.p.A. Terminaison d'une glissière de sécurité
EP1627956A1 (fr) * 2004-08-16 2006-02-22 SPIG Schutzplanken-Produktions-Gesellschaft mbH & Co.KG Glissière de sécurité routière

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11891765B2 (en) 2022-05-19 2024-02-06 Vandorf BT1 Inc. Barrier transition framework

Also Published As

Publication number Publication date
GB2439079A (en) 2007-12-19
GB2439079B (en) 2011-04-27
GB0611624D0 (en) 2006-07-19

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