FR2703375A1 - Guardrail post for road or highway safety barrier. - Google Patents

Abstract

The post (1) comprises a base (2) for bearing on the ground and an upright (4). The upright (4) comprises a web (5) and at least one plate (7) attached against a peripheral part of the web (5), so that the upright (4) has a cross-section having substantially the shape of an I.

Description

The invention relates to a railing post for

  road or highway safety barrier.

  Highway safety barriers and in particular

  those placed at the edge of aerial structures such as bridges or viaducts must be able to

  withstand very violent shocks caused by vehicles

  heavy cules These barriers generally consist of three beams supported by tubular posts of

  square section anchored in concrete.

  Due to their square section, the known posts must have a wall of significant thickness to have mechanical strength, and in particular sufficient buckling resistance; consequently, the posts according to the prior art are very heavy, which

  is a disadvantage for their installation.

  The object of the invention is to remedy this drawback

  comes by proposing a heavy railing post for road or highway safety barrier which, while having a mechanical behavior at least as good as that of known posts, is lighter and therefore more

easy to carry.

  To this end, the subject of the invention is a heavy railing post for a road or motorway safety barrier of the type comprising a support base on the ground and an upright and the upright of which comprises a core and at least one sole applied against a peripheral part of the core, so that the upright has a cross section having substantially the shape of an I. Preferably, if x is the distance, along a

  longitudinal direction of the upright, of a cross-section

  any side of the core at one end of the upright constituting the top of the post and y the width of the core

  at said section in the transverse direction

  the, y is proportional to the square root of x The post can then have only one sole which surrounds the core

  on at least part of its periphery.

  The post may further include a reinforcing element at a connection zone between the base and the at least one sole. Preferably, the base, the core, the at least one sole and the reinforcement, are parts cut from a

  sheet steel and assembled by welding.

  Also preferably, the steel sheet from which each of the pieces is cut, is a sheet metal

  weldable high yield strength steel, yield strength

elasticity greater than 600 M Pa.

  The invention will now be described in a more precise but nonlimiting manner with reference to the appended figures in which: FIG. 1 is a perspective view of a post according to the invention; Figure 2 is a schematic vertical sectional view of the post showing the geometric shape of

blade.

  The post generally marked with 1 in FIG. 1 comprises a base 2 pierced with holes 3 intended to allow anchor studs to pass into the ground, and a

  upright 4 perpendicular to the sole and fixed on it.

  The upright 4 has a core 5 whose rear edge 6 is of parabolic shape and the right front edge. If O is the top of the upright, x the distance to the top of any cross section AB of the core in the direction of the upright 4 and y the width of the core at the cross section AB: OA = x, AB = y,

we have: y: k fx.

  The core 5 is surrounded by a sole 7 added against its front and rear edges A reinforcement 8 is fixed on the one hand on the front face 9 of the sole 7 and on the other

share on base 2.

  The different parts (base 2, core 5, sole 7, reinforcement 8) are cut from steel sheets with high weldable elastic limit of elastic limit greater than 600 M Pa and assembled by welding along the

  joining edges such as 10, 12, 13, 14, 15.

  This post, with equal resistance to shock and buckling, is 40% lighter than a post depending

prior art.

  In another embodiment, the upright of the post may consist of an I-section laminated or produced by mechanical welding; it then has a soul and

two soles.

  The essential feature of the pole is the

  section in I of the amount which allows to obtain a resistance

  high buckling load with low weight La

  parabolic shape of the soul allows additional lightening

  be silent by constituting a beam called constant resistance

  te, that is to say whose external contour makes it possible to follow

  stress distribution in the event of an impact.

  Such posts are fixed at the edge of the shoes.

  aerial structures such as bridges and supports

  tent beams which form safety barriers The beams are fixed for example by bolting on the face

  front 9 of the sole which is substantially flat.

  These posts are particularly suitable for normal barriers defined in circular 88-49 of May 9, 1988 of the French Ministry of Equipment, but they can be adapted to light and heavy barriers.

defined by the same circular.

Claims (6)

  1. Guardrail post for safety barriers   rity of roads or motorways of the type comprising a base (2) for supporting the ground and an upright (4) characterized in that the upright (4) comprises a core (5) and at least one sole (7 ) attached against a peripheral part of the core (5), so that the upright (4) has a cross section having substantially the shape of an I. 2. Post according to claim 1, characterized in that, if x is the distance in a longitudinal direction of the upright (4) of any cross section of the core (5) to a longitudinal end of the upright (4) constituting the top of the post (1) and y the width of the web (5) at said section in a transverse direction, y is proportional to the root square of x.   3. Pole according to claim 2, characterized in that it comprises a single sole (7, 9) which surrounds   the core (5) over at least part of its periphery.   4 Post according to any one of the claims   tions above, characterized in that it further comprises a reinforcing element (8) at a connection zone between the base (2) and the at least one sole (7, 9).   5 Post according to any one of the claims   tions, characterized in that the elements: base (2), core (5), sole (7, 9) and reinforcement (8) of the post (1) are formed at least partially by pieces cut from a sheet of steel and assembled by welding.   6. Post according to claim 5, characterized in that the steel sheet in which each of the parts   is cut is a steel sheet with high elastic limit   weldable strength of elastic limit greater than 600 M Pa.