EP1741832A1 - Poteau de sécurité routière - Google Patents

Poteau de sécurité routière Download PDF

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Publication number
EP1741832A1
EP1741832A1 EP06116698A EP06116698A EP1741832A1 EP 1741832 A1 EP1741832 A1 EP 1741832A1 EP 06116698 A EP06116698 A EP 06116698A EP 06116698 A EP06116698 A EP 06116698A EP 1741832 A1 EP1741832 A1 EP 1741832A1
Authority
EP
European Patent Office
Prior art keywords
post
accessory
pillar
foundation
level
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.)
Withdrawn
Application number
EP06116698A
Other languages
German (de)
English (en)
Inventor
Van Sebastiaan Johannes Matheus Van Boxtel
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.)
Hydro Extrusion Drunen BV
Original Assignee
Alcoa Nederland BV
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 claimed from NL1029445A external-priority patent/NL1029445C2/nl
Priority claimed from NL1031041A external-priority patent/NL1031041C1/nl
Application filed by Alcoa Nederland BV filed Critical Alcoa Nederland BV
Publication of EP1741832A1 publication Critical patent/EP1741832A1/fr
Withdrawn legal-status Critical Current

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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
    • E01F9/00—Arrangement of road signs or traffic signals; Arrangements for enforcing caution
    • E01F9/60—Upright bodies, e.g. marker posts or bollards; Supports for road signs
    • E01F9/623—Upright bodies, e.g. marker posts or bollards; Supports for road signs characterised by form or by structural features, e.g. for enabling displacement or deflection
    • E01F9/631—Upright bodies, e.g. marker posts or bollards; Supports for road signs characterised by form or by structural features, e.g. for enabling displacement or deflection specially adapted for breaking, disengaging, collapsing or permanently deforming when deflected or displaced, e.g. by vehicle impact
    • E01F9/635—Upright bodies, e.g. marker posts or bollards; Supports for road signs characterised by form or by structural features, e.g. for enabling displacement or deflection specially adapted for breaking, disengaging, collapsing or permanently deforming when deflected or displaced, e.g. by vehicle impact by shearing or tearing, e.g. having weakened zones

Definitions

  • the invention relates to a traffic-safe pillar which has a reduced resistance to collisions and comprises a post to be anchored with respect to a positioning surface of a foundation, which post has, in the longitudinal direction, a bending stiffness which is constant or varies continuously and/or in steps.
  • a pillar of this type is known and is used for many different purposes. It is known to use pillars for street lighting, traffic signs, traffic lights and the like.
  • the pillar has to be sufficiently strong to be able to withstand normally occurring loads, such as static loads and wind loads. These requirements affect the strength and stiffness of the pillar, which have to meet specific minimum requirements in order to prevent the pillar from collapsing under the normally occurring abovementioned loads or vibrations and the like.
  • the pillars are in general positioned immediately next to a carriageway, with the result that vehicles coming off the carriageway for any reason may collide with the pillar. It is exactly in these cases that it is desirable for the pillar not to be excessively strong and stiff, but rather for it to provide a reduced resistance to collisions. Such a reduced resistance is very desirable in order to prevent excessive deceleration of the colliding vehicle to such a degree that injuries to the vehicle occupants can be limited.
  • the known pillars are not able to satisfy this requirement, and instead fold themselves around the colliding vehicle, as it were.
  • the bottom part of the pillar ends up under the vehicle, while the top part of the pillar, as a result of the inertia, folds backwards over the top of the vehicle.
  • the folded pillar has a considerable retaining action on the vehicle, leading to significant deceleration of the vehicle and thus to a high risk of injuries to the occupants.
  • the entire pillar may eventually be pulled out of the ground by the colliding vehicle or crack in an uncontrolled manner at an arbitrary position.
  • a pillar which attempts to reconcile these contradictory requirements in such a way that, on the one hand, it can withstand the loads occurring under normal circumstances and yet, on the other hand, can provide a reduced resistance to substantially transversely directed loads occurring during a collision is known from Dutch Patent Application 7.311.469 .
  • This known pillar has a hollow post to which a number of reinforcing rods running in the longitudinal direction are attached. If a local, transversely directed load on the post exceeds a specific threshold value, the connection between the rods and the post has to be severed so that the post is able to yield.
  • it is a drawback of this known pillar that it is difficult to produce. In particular, it is not readily possible to make conventional pillars safer in the event of an impact by using this method.
  • the relatively stiff or hard insert forms an abrupt transition in the stiffness profile, in particular in the bending stiffness profile of the pillar, which leads to an initial bending or deflection at this transition in stiffness, causing the cracking or breaking of the pillar.
  • the insert is at such a height that, for example, the bumper of the vehicle can hit it, the desired state of deformation is always ensured.
  • the insert has to be at the desired level above the positioning surface for the post, such as ground level, a bridge deck and the like.
  • the height over which the insert extends inside the post can be limited.
  • the position of the bottom boundary of the insert can also be varied.
  • the bottom boundary of the accessory is at a higher level than the part of the post which is to be positioned at the level of the positioning surface of the foundation.
  • the entire insert is thus above the positioning surface.
  • there are two abrupt transitions in stiffness in the pillar i.e. one at the top boundary and one at the bottom boundary of the insert.
  • the main advantage of this variant is that the post breaks in a very reliable manner, so that the entire insert is forced out of the pillar in the event of a collision, resulting in the creation of a considerable weakened section.
  • the insert in the normal state, is clear from the internal surface of the post, at least at the boundary or boundaries.
  • This offers the advantage that fatigue of the post is prevented.
  • slight elastic deformations occur in the post, under the effect of a variety of loads, but in particular as a result of the wind load, which could lead to signs of fatigue in the post if the insert is clamp-fitted. Keeping the boundaries at a distance from the internal surface of the post prevents the post from still coming into contact with the stiff insert in such a manner, and premature initiation of crack-formation is avoided.
  • the bottom boundary of the accessory is located near the part of the post, which is to be positioned at a level above the positioning surface of the foundation, which approximately corresponds to the level at which a bumper or another colliding part of a passenger vehicle is positioned above a road surface.
  • the bottom boundary of the accessory may be located at a distance above the part of the post which is to be positioned at a level above the positioning surface of the foundation which is equal to 200 to 600 mm. More particularly, the bottom boundary of the accessory may be located at a distance above the part of the post which is to be positioned at a level above the positioning surface of the foundation which is equal to 300 to 500 mm. In particular, the bottom boundary of the accessory may be located at a distance of approximately 400 mm above the positioning surface of the foundation. These heights are matched to the levels at which the bumpers and the like of road vehicles may be located.
  • the accessory may therefore extend to below the level of the positioning surface of the foundation.
  • the position of the accessory may be varied further; according to a first alternative, the accessory may be arranged in the interior of the post. In that case, the accessory is provided with a bore extending in the longitudinal direction for the passage of ducts. According to a further variant, the accessory may be arranged on the exterior of the post. In particular, the accessory may in that case extend entirely around the post.
  • the accessory can readily be retrofitted to pillars which have already been positioned. Thus, it is for example possible to render a road or motorway safer by fitting the accessory according to the invention to the pillars positioned next to the former.
  • the accessory may be provided with projections which are directed at a surface of the post. Furthermore, a boundary of the accessory, which boundary is situated at a higher level than the part of the post which is to be positioned at the level of the positioning surface, may comprise a sharp edge suitable for initiating crack formation in the post upon collision load.
  • An insert of this type can be produced in a simple manner, for example by extrusion, from aluminium.
  • the post which is used with the pillar according to the invention may be made from aluminium in the usual way.
  • the invention can also be applied to posts consisting of a different material, for example plastic.
  • the insert itself does not have to be made from aluminium or steel either, but may, for example, be made from a reinforced, rigid plastic, such as a fibre-reinforced plastic material.
  • the invention furthermore relates to a method for causing a pillar to collapse in a controlled manner, as described above, comprising the following steps:
  • Causing the post to crack in such a manner that it breaks in a controlled manner and is not able to apply any great deceleration forces on the colliding vehicle may be effected, for example, by collision forces occurring between the accessory and the post. These collision forces are the result of the collision energy of the road vehicle.
  • the cracking of the post in a controlled manner may be effected by cutting forces being applied to the post at the location of a sharp part of the accessory as a result of the collision energy from a road vehicle. In this case, the accessory may even be forced out of the post altogether.
  • Fig. 1 shows a pillar 1 comprising a hollow tube 3 anchored in the ground 2.
  • An insert 4 is placed inside the hollow tube 3.
  • the top boundary 8 of the insert is at a distance h above ground level.
  • This top boundary 8 defines a spot where the post wall will collapse in the event of a collision by crack formation.
  • the spot where crack formation occurs is thus slightly above the positioning surface of the pillar, such as ground level or a bridge deck, but not above the area where a colliding vehicle will hit the pillar.
  • the insert 4 extends to below ground level, so that there is only one stiffness transition above ground level.
  • the insert 4 illustrated is fixedly connected with respect to the tube 3 by means of fastening means 5, for example in the form of bolts, welds, an adhesive joint and the like.
  • the bottom side of the insert 4 can also rest on the bottom side of the post 3 on the ground material or be provided with a cable on the top side by which it is suspended inside the post 3. If desired, the insert 4 may be securely clamped inside the post 3. However, it is advantageous if the insert 4 does not under any circumstances touch the top boundary 8 of the post wall during normal use, so that signs of fatigue are prevented.
  • Fig. 2 shows the pillar containing an insert 4 therein according to the invention in cross section.
  • the insert 4 shown has a number of projections 7 situated around the periphery, the insert 4 having a star-shaped cross section.
  • the wall of the post 3 touches a projection 7 during a collision, the latter causes very high stresses in the wall of the post as a result of the relatively small contact surface. It is an advantage of the embodiment having a star-shaped cross section that the collapse of the pillar 1 in the event of a collision is less dependent on the angle of impact of the vehicle.
  • the diameter of the top boundary 8 of the insert 4, i.e. the abrupt transition in stiffness, is smaller than that of the inner diameter of the post 3 at the insert, which tolerance is indicated by s.
  • the wall of the post does not touch the insert 4 at the location of the top boundary 8 of the insert, which state is indicated by a broken line in Fig. 4.
  • the post 3 will deform and the wall of the post will come into contact with the insert 4.
  • high stresses occur at the location of the contact spot 20 which crack the material of the post wall, following which the post 3 collapses.
  • the greater the tolerance s the greater the deformation of the post 3 which is required in order for the post wall to come into contact with the top boundary of the insert 4.
  • the tolerance s is relatively small, so that the desired crack formation occurs early on during a collision.
  • the insert 4 shown is furthermore provided with a bore 6 for the passage of power supply ducts and the like from the bottom of the post 3.
  • Figs 3a to 3c show some alternative embodiments of the insert.
  • the insert 4 shown in Fig. 3a consists of a thick-walled tube without projections
  • the insert 4 shown in Fig. 3b consists of a prismatic rod having a square cross section and a bore 6
  • the insert 4 shown in Fig. 3c consists of a prismatic rod having a triangular cross section.
  • an insert 4 is used of which not only the top boundary 8, but also the bottom boundary 9 are above the level of the ground 2 in which the pillar 1 is placed.
  • this insert 4 may be constructed from two gear-like shapes 10, 11, which are connected to one another by a connecting piece 12 with a smaller outer diameter.
  • the teeth of these gear-like shapes 10, 11 are, as explained above, positioned at some distance from the internal surface of the post 3 in order to prevent signs of fatigue.
  • Fig. 6 shows the variant in which an accessory 13 is used which extends around the pillar 3.
  • This accessory 13 consists of two identical parts 14, 15, Fig. 7 showing the top view of various variants of the accessory 13.
  • the variant according to Fig. 7a has an accessory 13 consisting of two jacket halves 14, 15 which have a smooth interior surface. Preferably, this interior surface is at some distance from the external surface of the post 3.
  • the jacket halves 14, 15 have internal teeth, which extend in the longitudinal direction of the post 3, more or less like the shape of an internal gearwheel.
  • each of the jacket halves 14, 15 has three teeth 17 which are evenly distributed.
  • Fig. 8 shows that the external accessory 13 can not only be positioned above the level of the ground 2, but also half underground.

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Road Signs Or Road Markings (AREA)
EP06116698A 2005-07-06 2006-07-06 Poteau de sécurité routière Withdrawn EP1741832A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL1029445A NL1029445C2 (nl) 2005-07-06 2005-07-06 Verkeersveilige mast.
NL1031041A NL1031041C1 (nl) 2006-01-31 2006-01-31 Verkeersveilige mast.

Publications (1)

Publication Number Publication Date
EP1741832A1 true EP1741832A1 (fr) 2007-01-10

Family

ID=37075094

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06116698A Withdrawn EP1741832A1 (fr) 2005-07-06 2006-07-06 Poteau de sécurité routière

Country Status (1)

Country Link
EP (1) EP1741832A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU2007200769B2 (en) * 2006-09-29 2009-05-14 Ideal Industries Lighting Llc Reinforced pole structure
GB2473186A (en) * 2009-09-02 2011-03-09 Salop Holdings Ltd Post insert
ES2396900A1 (es) * 2011-02-15 2013-03-01 Ecotécnica Integral S.L. Dispositivo de seguridad pasiva en estructuras de soporte de equipamientos de carretera.
EP3081695A1 (fr) 2015-04-13 2016-10-19 Hunter Douglas Industries B.V. Poteau de services publics avec ensemble de couplage à cisaillement
RU172540U1 (ru) * 2016-06-23 2017-07-11 Вадим Эдуардович Поплавский Информационно-предупредительный знак

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2227661A1 (de) * 1972-06-07 1973-12-20 Manfred Wolf Aufstellpfosten, insbesondere zum aufstellen von verkehrsschildern und strassennamensschildern
EP0049726A1 (fr) * 1980-10-13 1982-04-21 ESV-konsult AB Ingenjörsfirma Poteau de sécurité routière
US4522530A (en) * 1982-12-09 1985-06-11 Arthur W Eugene Self-erecting roadway marking post
DE8606161U1 (de) * 1986-03-06 1986-05-07 Faltas, Safwat M., 2800 Bremen Pfahl zum Halten von Verkehrsschildern, Lampen, Leitungen etc.
FR2616818A1 (fr) * 1987-06-16 1988-12-23 Laporte Ets A Dispositif pour la fixation encastree d'un mat ou analogue
GB2396180A (en) * 2002-12-10 2004-06-16 Mallatite Ltd Column for road sign, street lighting etc.

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2227661A1 (de) * 1972-06-07 1973-12-20 Manfred Wolf Aufstellpfosten, insbesondere zum aufstellen von verkehrsschildern und strassennamensschildern
EP0049726A1 (fr) * 1980-10-13 1982-04-21 ESV-konsult AB Ingenjörsfirma Poteau de sécurité routière
US4522530A (en) * 1982-12-09 1985-06-11 Arthur W Eugene Self-erecting roadway marking post
DE8606161U1 (de) * 1986-03-06 1986-05-07 Faltas, Safwat M., 2800 Bremen Pfahl zum Halten von Verkehrsschildern, Lampen, Leitungen etc.
FR2616818A1 (fr) * 1987-06-16 1988-12-23 Laporte Ets A Dispositif pour la fixation encastree d'un mat ou analogue
GB2396180A (en) * 2002-12-10 2004-06-16 Mallatite Ltd Column for road sign, street lighting etc.

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU2007200769B2 (en) * 2006-09-29 2009-05-14 Ideal Industries Lighting Llc Reinforced pole structure
GB2473186A (en) * 2009-09-02 2011-03-09 Salop Holdings Ltd Post insert
GB2473186B (en) * 2009-09-02 2013-03-27 Salop Holdings Ltd Post insert and hollow post incorporating such an insert
ES2396900A1 (es) * 2011-02-15 2013-03-01 Ecotécnica Integral S.L. Dispositivo de seguridad pasiva en estructuras de soporte de equipamientos de carretera.
EP3081695A1 (fr) 2015-04-13 2016-10-19 Hunter Douglas Industries B.V. Poteau de services publics avec ensemble de couplage à cisaillement
RU172540U1 (ru) * 2016-06-23 2017-07-11 Вадим Эдуардович Поплавский Информационно-предупредительный знак

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