FR2824090A1 - Metal safety barrier for road verge comprises support posts and rail having transverse undulation allowing lengthening when subjected to traction during impact - Google Patents

Abstract

The safety barrier is composed of C-shaped support posts embedded in the ground, a rail (3) with a retractor piece able to connect a rail and a post. A transverse undulation (5) in the rail ensures lengthening of the rail when it is subjected to traction during an impact.

Description

upper plate (2) is covered by a cover (1).

  Safety railing on the shoulder

especially by road or highway.

  The present invention relates to a metal safety barrier on the shoulder, in particular of road or motorway, composed of support posts, generally in the form of a C sealed in the ground, of at least one smooth, profiled metal horizontal strip made up of a series of elements. , one piece

  called a spacer allowing the link between a stringer and a post.

  The main function of a road safety device such as for example the safety barriers is to steer the vehicle in distress while

  absorbing its kinetic energy by the deformation of the device.

  The purpose of the slides is to dissipate as much energy as possible during the tensioning of the rails, following a vehicle impact, to improve the.,.

securte roubere.

  s Highway barrier rails are generally profiled metal strips, the most common section of which is wave-shaped. These beams are bolted together so as to form a uniform strip along the road or the highway. During the impact of a vehicle against the slide, the beams are subjected to a traction force, known as the belt effect. It is the same for the wave form of the stringer which deforms under the impact and

  also participate in the dissipation of energy.

  The main drawbacks of known slides are as follows: the energy dissipated in the beams during an impact is not optimized, the ability to absorb deceleration is relatively poor, - the generally large impacted area makes maintenance difficult. In addition, in the event of small impacts, it is necessary to change the entire element of the arm. The object of the invention is to improve the absorption of energy due to the shock of a

vehicle on the slide.

  The object of the invention relates to a safety barrier on the shoulder, in particular of road or motorway, characterized in that it comprises, over a part of its long ueu, at least one means ensuring an extension of the heald

  when the latter is subjected to traction.

  The other characteristics of the invention are: - the means ensuring an extension of the heald is composed of at least one

  s transverse undulation made on the rail.

  - the corrugation is made at the end of the different elements of the heald, at

level of their bond.

  The following description and the attached figures, all given by way of example

  not limiting, will make the invention well understood.

  o Figures 1a and 1b show in lateral and longitudinal views an example

slide realization.

  Figure 2 shows a means according to the invention, ensuring an elongation of

  the boom when the latter is subjected to traction upon impact.

  The metal safety runners 1 on the shoulder and in the central reservation, in particular on the road or motorway, as shown in FIGS. 1a and 1b, are composed of support posts 2 profiles, generally C-shaped, sealed in the ground, d '' at least one heald 3, horizontal metal profiled strip, of a part called spacer 4 making it possible to make the link between a heald 3 and a post 2. The heddles 3 are composed of a series of elements united end to end and the elements are bolted together and can

  also be linked together at the level of the spacer 4 carried by the post 2.

  According to the invention, the slide comprises over a part of its length at least one means ensuring an elongation of the beam when the latter is subjected

traction.

  Preferably, the means ensuring an elongation comprises at least one undulation oriented perpendicular to the longitudinal axis of the heald and associated with said heald, as shown in an exemplary embodiment, on

Figure 2.

  By inserting into the slide, associated with the boom, a means, for example, in the form of a wave 5, said means, by the so-called "belt" effect, created during the impact of a vehicle on the smoothes an elongation effect by deformation which will, for its part, absorb the shock. The damping of the shock is ensured by the longitudinal deformation of the heddle and of the corrugation 5 and

  also by the deformation by folding of the arm, at the level of the corrugation.

  In the example cited, the means ensuring an extension of the arm when it is subjected to traction under impact is made up of three parts. A first part 6 of evolutive and transitory shape passing from the wave profile of the heald to a flat part, a second undulating part 5, in accordion or sinusoidal shape which can comprise a succession of half i-periods in the longitudinal direction of the heald , and a third part 7 preferably symmetrical to the

o first part 6.

  This means can be located on a part of an element of the heald and preferably at the end of the element, in line with a post, two concomitant heald elements are then mounted by superposition of the corrugated parts 5

then, for example, bolted.

  The advantages of the proposed invention are as follows: - possible adaptation on existing slides, by category, depending on the shape of the heald profile, - greater energy dissipation during a shock by unfolding the corrugations, o - a reduction in the ASI (Acceleration Severity Index) coefficient, corresponding to a softening of the decelerations for the passengers during the impact, - an improvement in road safety, - an ease of maintenance in the event of small impacts generating a gain of

  time, intervention on the roadway.

l

Claims (3)

  1. Safety metal slide (1) on shoulders, in particular on roads or motorways composed of posts (2) supports, generally C-shaped, sealed in the ground, of at least one smooth (3), profiled metal horizontal strip consisting of a series of elements, of a part called a spacer (4) making it possible to make the link between a heald (3) and a post (2), characterized in that it comprises over part of its length at minus a means ensuring a   extension of the arm when the latter is subjected to traction.   2. Slide according to claim 1 characterized in that the means assu rant u n al along the heald is composed of at least u und u lation (5)   transverse formed on the rail.   3. Slide according to claim 2 characterized in that the corrugation (5) is produced at the end of the various elements of the heald, at their connection.