GB2156884A - Vehicle crash barriers - Google Patents

Vehicle crash barriers Download PDF

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Publication number
GB2156884A
GB2156884A GB08507885A GB8507885A GB2156884A GB 2156884 A GB2156884 A GB 2156884A GB 08507885 A GB08507885 A GB 08507885A GB 8507885 A GB8507885 A GB 8507885A GB 2156884 A GB2156884 A GB 2156884A
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GB
United Kingdom
Prior art keywords
barrier
construction
rail
deformable
posts
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.)
Granted
Application number
GB08507885A
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GB2156884B (en
GB8507885D0 (en
Inventor
Vincent Michael Demarest
Original Assignee
Vincent Michael Demarest
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
Priority to GB848409075A priority Critical patent/GB8409075D0/en
Application filed by Vincent Michael Demarest filed Critical Vincent Michael Demarest
Priority to GB08507885A priority patent/GB2156884B/en
Publication of GB8507885D0 publication Critical patent/GB8507885D0/en
Publication of GB2156884A publication Critical patent/GB2156884A/en
Application granted granted Critical
Publication of GB2156884B publication Critical patent/GB2156884B/en
Expired legal-status Critical Current

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Classifications

    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01FADDITIONAL WORK, SUCH AS EQUIPPING ROADS OR THE CONSTRUCTION OF PLATFORMS, HELICOPTER LANDING STAGES, SIGNS, SNOW FENCES, OR THE LIKE
    • E01F8/00Arrangements for absorbing or reflecting air-transmitted noise from road or railway traffic
    • E01F8/0005Arrangements for absorbing or reflecting air-transmitted noise from road or railway traffic used in a wall type arrangement
    • E01F8/0017Plate-like elements
    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01FADDITIONAL WORK, SUCH AS EQUIPPING ROADS OR THE CONSTRUCTION OF PLATFORMS, HELICOPTER LANDING STAGES, SIGNS, SNOW FENCES, OR THE LIKE
    • E01F15/00Safety 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
    • E01F15/02Continuous barriers extending along roads or between traffic lanes
    • E01F15/04Continuous barriers extending along roads or between traffic lanes essentially made of longitudinal beams or rigid strips supported above ground at spaced points
    • E01F15/0407Metal rails
    • E01F15/0438Spacers between rails and posts, e.g. energy-absorbing means

Abstract

A vehicle crash barrier is designed to provide a progressively increasing resistance to impact. In one embodiment a rail (12) is mounted on upright posts (10) by means of dual connecting elements (13, 14) the rear elements (13) being of rectangular box section and relatively stiff while the front elements (14) are of hexagonal cross-section and therefore more easily deformed. Some of the web pairs of the hexagonal section are inclined to the direction of thrust. In another example the beam assembly includes two rails (20,21) the lower rail positioned forwards of the upper rail and mounted on dual collapsible connections (24,25) while the upper rail (20) is carried by relatively stiff connections (23). <IMAGE>

Description

SPECIFICATION Vehicle crash barriers This invention relates to vehicle crash barriers as used on motorways and motor roads, of the type comprising a generally horizontal beam supported by upright posts.
One of the problems experienced with existing crash barriers is that if they are made sufficiently strong and rigid to withstand the impact of a heavy vehicle they are then too rigid and inflexible when struck by a light vehicle or car, and there is a risk ofthe light vehicle being deflected back onto the motor road out of control with the risk of creating a further accident. Accordingly it is an object of the invention to provide an improved crash barrierwhich will minimisethis problem.
Broadly stated the invention consists in a vehicle crash barrier comprising a series of upright posts supporting a generally horizontal beam construction, the connections between the beam construction and the posts being designed to provide a progressively increasing resistance to impact by a vehicle on the beam construction. According to a preferred feature ofthe invention the connections between the beam construction and the posts includetwo elements one of which is relatively more easily deformed than the other in a horizontal direction transverse to the length ofthe beam construction. In a particular preferred construction the more easily deformable element includes a web which is inclined in relation to the transverse plane, and there may be two mutually inclined webs joining at an apex angle.The deformable element preferably comprises a hollow tubular open ended member of polygonal or rounded section, whereas the relatively stiff connecting elementprefer- ably includes one or more flanges lying in planes parallel to the transverse plane.
According to another preferred feature ofthe invention the beam construction comprises two separate rails mounted one above the other, one supported by realtively stiff connecting elements and the other by more easily deformable elements.
Preferably the rail mounted on more deformable elements is set forward relative to the other rail.
The invention may be performed in various ways and three embodiments with some possible modifications will now be described by way of example with reference to the accompanying drawings, in which: Figure lisa front elevation of a first example of crash barrier according to the invention, Figures 2 and 3 are end and plan views of partofthe barrier, Figure 4 is a perspective view of the barrier, Figures 5 and 6 are front and end elevations of a second embodiment, and Figures7 and 8 are plan and perspectiveviewsof this second embodiment.
Referring first to Figures 1 to 3, a crash barrier comprises a series of upright posts 10, preferably of I-section steel set into concrete bases and in some cases inter-filled by boarded timberfencing 11. The actual crash beam 12 may be ofvarious different cross-sections, but in this particular example it is a hollow box rail oftrapezoidal profile. At each upright post the rail is supported by a connection which includesfrontand rear connecting elements 13,14.
The rear element 13 isofsquare box section having two webs 15 both parallel to a vertical transverse plane perpendicularto the length of the rail. This element 13 is thus relatively stiff to withstand impacts by a vehicle against the rail. The front connecting element 14 is of hexagonal box section and has two pairs of webs 16A, 1 6B both inclined in relation to the transverse plane and meeting at apex corners 17. Thus it will be seen that this front element 14 is more readily defomed by a vehicle impact and if the crash barrier is struck bya light vehicletheforce will be absorbed by collapsing of the front hexagon.This collapsing may be sufficientto absorb most of the energy of an impact from a light vehicle, but if the rail is struck by a heavy vehicle the hexagon element will be fully flattened and the heavy impact will then be absorbed by deforming and flattening of the rear square box section. Thus the system provides a progressively increasing resistance as the connection is more heavily flattened.
Figure 3 also illustrates an importantfeature of the invention concerned with the attachment of the structure to the vertical eye section steel posts 10. In previous constructions the attachment was made by means of long bolts passing through the back wall of the connecting element on the front of the post, through holes drilled in the timber fencing 11 and also through heavy metal anchorage plates located behind the posts 10 on the opposite side of the timber fence.
This system is awkward to assemble and erect since it requires access from both sides of the fence and it is also impossible to adjust vertically without withdrawing the bolts and drilling fresh holes, thus leaving the original holes exposed, which in the case of a noise attenuation fence would significantly reduce its effectiveness.
By contrast in the system illustrated, for example in Figure 3, a pair of heavy duty anchor clamps 28 are secured to the rear wall ofthe box connecting element 14, so as to clamp the hexagon securely to the adjacent flange 29 of the post 10. The fastening nuts 31 are readily accessible and the whole construction can be assembled, erected or removed from one side of the fence. Moreover it is also possible to adjustthe vertical height merely by slackening the nuts 31, shifting the unit into the required position on the post 10, and retighteningthe nuts.
Thefurtherexample illustrated in Figures 5to 8 has a beam consisting of two separate rails 20,21 both mounted on common upright posts 22 with the upper rail 20 set back towards the post in relation to the lower rail 21. The upper rail 20 is supported by connecting elements 23, which are of square or rectangular box section, a clearly seen in Figure 7, and provide more rigid support and resistance against heavy impacts.
The lower rail 21 is mounted on dual connecting elements 24,25 similar to the previous example illustrated in Figures 2 and 3 : the front element 24 is a hollow hexagon and the rear element 25 is a hollow squaretubularbox. Itwill benotedthatthefrontwall 26 ofthistubular box is positioned somewhat in front of the front wall 27 ofthe upper rectangular box 23.
This system provides a triple progressive increases in impact resistance. If a lightvehicle strikes the lower rail 21 thefirst impact is absorbed by the collapse of the hexagon 24 and that may be sufficient to absorb thewholeforceofthe impactwithoutcausing an undesirable rebound. If struck bya heavy vehicle the front hexagon will befullyflattened and the square box 25 will deform progressivelythus absorbing some of the heavy force of the impact.When this square box has partially collapsed the vehicle will also strike the upper rail 20 and the overall impact resistancewillthen be further increased. twill be noted thatthe side walls 30 ofthe rectangular box 23, being shorter in a transverse direction than the side walls ofthe square box 25, will be of greater rigidity and, of course, will be acting "in parallel" with the square box providing an additive resistance. Thus it will be seen that according to one important feature of the invention the progressive increase in resistance is obtained by use of separate cushioning elements of different resistance to impact, and arranged "in series" between the beam and its supporting posts so that the force of the impact passes through both elements. Alternatively, orin addition,thetwo elements of different resistance may be arranged "in parallel" between the beam and the supporting posts sothattheforceofan impact is applied and shared between the elements. Inthelattercasethebeam is preferably formed bytwo separate rails one offset forwards in relation to the other.

Claims (9)

1. Avehiclecrash barriercomprising aseriesof upright posts supporting a generally horizontal beam construction, the connections between the beam construction and the posts being designed to provide a progressively increasing resistance to impact by a vehicle on the beam construction.
2. A barrier according to Claim 1, in which the connections between the beam construction and the posts include two elements one of which is relatively more easily deformed than the other in a horizontal direction transverse to the length of the beam construction.
3. A barrier according to Claim 2, in which the more easily deformable element includes a web which is inclined in relation to the transverse plane.
4. A barrier according to Claim 3 in which there are two mutually inclined websjoining atan apex angle.
5. A barrier according to anyofthe preceding claims in which the deformable element comprises a hollowtubulropen ended member of polygonal or rounded section.
6. A barrier according to any of claims 3 to 5, in which the relatively stiff connecting element includes one or moreflanges lying in planes parallel to the transverse plane.
7. A barrier according to any ofthe preceding claims, in which the beam construction comprises two separate rails mounted one above the other, one supported by relatively stiff connecting elements and the other by more easily deformable elements.
8. A barrieraccording to Claim 7, in which the rail mounted on more deformable elements is setforward relative to the other rail.
9. A vehicle crash barrier substantially in any of the forms described with reference to the accompanying drawings.
GB08507885A 1984-04-13 1985-03-26 Vehicle crash barriers Expired GB2156884B (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB848409075A GB8409075D0 (en) 1984-04-13 1984-04-13 Vehicle crash barriers
GB08507885A GB2156884B (en) 1984-04-13 1985-03-26 Vehicle crash barriers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB08507885A GB2156884B (en) 1984-04-13 1985-03-26 Vehicle crash barriers

Publications (3)

Publication Number Publication Date
GB8507885D0 GB8507885D0 (en) 1985-05-01
GB2156884A true GB2156884A (en) 1985-10-16
GB2156884B GB2156884B (en) 1989-02-15

Family

ID=26287589

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08507885A Expired GB2156884B (en) 1984-04-13 1985-03-26 Vehicle crash barriers

Country Status (1)

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GB (1) GB2156884B (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2207941A (en) * 1987-06-09 1989-02-15 William Robert Sheffield Road safety barrier
DE10062648A1 (en) * 2000-12-15 2002-06-27 Sps Schutzplanken Gmbh Passive retaining device used for protecting roadway, especially as crash protection on road bridge, comprises third protection device arranged between first and a second protection device and extending along the roadway
EP1391558A1 (en) * 2002-08-20 2004-02-25 Sec Envel S.à.r.l. Road security barrier comprising deformable spacers
GB2397604A (en) * 2003-01-25 2004-07-28 Corus Uk Ltd Parapet
GB2439318A (en) * 2006-06-26 2007-12-27 Corus Uk Ltd Safety barrier for positioning on a road
GB2464905B (en) * 2007-09-13 2013-03-27 Highway Care Ltd Barrier system
CN105178219A (en) * 2015-08-26 2015-12-23 宁波大学 Honeycomb obstruction block central guardrail

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB362711A (en) * 1931-01-01 1931-12-10 Eugene Vernon Camp Shock absorbing highway guard or fence
GB426831A (en) * 1933-10-24 1935-04-10 Republic Steel Corp Improvements in or relating to road guards
GB1090307A (en) * 1965-12-02 1967-11-08 Voest Ag Improvements in or relating to kerb guides for vehicles
GB1105990A (en) * 1966-03-28 1968-03-13 Sina In Nat Autostradali Improvements in or relating to guard rails at road protection barriers
GB1411062A (en) * 1972-01-31 1975-10-22 Baumann E Shock absorbers
GB1417109A (en) * 1971-10-20 1975-12-10 Road Research Ltd Traffic guard rails

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB362711A (en) * 1931-01-01 1931-12-10 Eugene Vernon Camp Shock absorbing highway guard or fence
GB426831A (en) * 1933-10-24 1935-04-10 Republic Steel Corp Improvements in or relating to road guards
GB1090307A (en) * 1965-12-02 1967-11-08 Voest Ag Improvements in or relating to kerb guides for vehicles
GB1105990A (en) * 1966-03-28 1968-03-13 Sina In Nat Autostradali Improvements in or relating to guard rails at road protection barriers
GB1417109A (en) * 1971-10-20 1975-12-10 Road Research Ltd Traffic guard rails
GB1411062A (en) * 1972-01-31 1975-10-22 Baumann E Shock absorbers

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2207941A (en) * 1987-06-09 1989-02-15 William Robert Sheffield Road safety barrier
DE10062648A1 (en) * 2000-12-15 2002-06-27 Sps Schutzplanken Gmbh Passive retaining device used for protecting roadway, especially as crash protection on road bridge, comprises third protection device arranged between first and a second protection device and extending along the roadway
EP1391558A1 (en) * 2002-08-20 2004-02-25 Sec Envel S.à.r.l. Road security barrier comprising deformable spacers
FR2843762A1 (en) * 2002-08-20 2004-02-27 Jean Claude Frederic Dupuis SAFETY BARRIER FOR VEHICLE TRAFFIC LANES, INCLUDING DEFORMABLE SPREADERS
GB2397604A (en) * 2003-01-25 2004-07-28 Corus Uk Ltd Parapet
GB2397604B (en) * 2003-01-25 2007-09-05 Corus Uk Ltd Parapet
GB2439318A (en) * 2006-06-26 2007-12-27 Corus Uk Ltd Safety barrier for positioning on a road
GB2464905B (en) * 2007-09-13 2013-03-27 Highway Care Ltd Barrier system
CN105178219A (en) * 2015-08-26 2015-12-23 宁波大学 Honeycomb obstruction block central guardrail
CN105178219B (en) * 2015-08-26 2017-08-15 宁波大学 A kind of central guardrail of cellular obstruction block

Also Published As

Publication number Publication date
GB2156884B (en) 1989-02-15
GB8507885D0 (en) 1985-05-01

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Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19940326