FR2555622A1 - Reinforcement element for a crash barrier support and corresponding reinforced support - Google Patents

Abstract

The present invention relates to a reinforcement element for a crash barrier support, the said support being of the section type 1 having a C-shaped cross-section partially sunk into the ground and oriented in such a way that the opening 7 of the C faces the opposite side to that of the road to be protected, the crash barrier being fixed to the back of the web 10 of the support 1. The reinforcement element 13 according to the invention is in the shape of a L-shaped section whose flanges 14-15 are spaced apart at their ends by a gap 16 equal to the width of the opening 7 and whose ends 17-18 of the flange returns 19-20 bear on the curved sections 21-22 of the C, the said reinforcement element 13 being driven into the ground inside the support 1 in order to be partially buried. The invention can be applied to reinforcement elements for crash barrier supports, for providing them with a satisfactory strength under a horizontal thrust, even in the event of severe corrosion of the supports at ground level.

Description

 The present invention relates to a reinforcement for a support for a road and motorway safety barrier as well as the corresponding reinforced support.

 We know that the safety barriers which border roads and highways, on shoulders and / or median, are each formed by a rail which extends continuously over several hundred meters, even over several kilometers, said rail. being carried by support elements arranged vertically, at regular intervals, xet partially buried in the soil of the embankment or the embankment which borders the roadway.

 The rail is itself formed by several profiled elements, of common cross section, joined two by two, by bolting, by their ends placed in overlap and aligned to ensure the continuity of the slide.

 Each slide element is secured to the supports, generally by bolting, sometimes directly, but most often by means of parts called "spacers" or "spacers" which are each bolted on the one hand to the support, at the head thereof. , and on the other hand on the slide, in line with the vertical axis of symmetry of the support.

 Each slide element is thus fixedly supported at a height which is of the order of 50 centimeters to 1 meter, depending on the type of protection to be provided, the profile of the road and / or motorway and also the types of vehicles traveling there. - passenger cars, competition cars, trucks -.

 The slide supports are profiled metal elements, the cross section of which depends on the safety to be ensured as well as the number and shape of the slides - single slides or double slides - secured to said supports.

 Thus, it is known to use supports with a straight I-shaped section, hot-shaped, and supports with a straight C-shaped section, generally cold-formed.

 The I-sections are generally IPE 80 and the C-supports are generally of dimensions 100x50 and 125x65 and are made of Corten steel or galvanized E24 steel.

 All these I and C profile supports have in common that they are beaten in the ground, so as to be partially buried, for about 80 centimeters, and emerge from the ground from a height of about 70 to 120 centimeters .

 These supports also have in common the need to provide resistance at the level of the slide, therefore at the level of the retractor, of at least 800 decanewtons (daN) under a horizontal thrust.

 However, owing to the fact that these supports are partly buried and are partly in the open air, they exhibit excessive oxidation, in particular around level 0 relative to the ground, which reduces their resistance to horizontal thrusts below the admissible value.

 This oxidation is present at the foot of almost all of the safety barrier supports, and this for various causes including, in particular, corrosion due to repeated attacks by air humidity and more or less harmful products which are find in infinitesimal quantity in the atmosphere, in particular in the industrial sectors, the corrosion due to the products which are projected on the roadway for its maintenance, such as chlorides, and as well on the impacts of vehicles when they touch the bordering slide pavement.

 However, the fact that the slide supports, and in particular the Corten steel supports, can no longer provide the necessary resistance to horizontal thrust when necessary has led the organizations responsible for ensuring road and motorway safety to order that it is provided for the replacement of said supports.

It is obvious that such a substitution would have numerous drawbacks: very long lead time and its corollary, that is to say high cost price.
I1 should indeed unbolt all the slide elements and / or the spacers with which they are associated supports become non-conforming. Then, it would be necessary to tear off these supports from the floors in which they are buried and finally it would be necessary to proceed to threshing the new supports then to the bolting of these new supports on the spacers or directly on the slides.

 In order to avoid such manipulations, and therefore to reduce the time and the cost of delivering the non-conforming supports to a sufficient value for resistance to horizontal thrusts, the applicant has proposed to seek to reinforce the non-conforming supports so to bring their resistance value to the minimum value of 800 daN at the level of the slide.

 This is how it developed a shape of profile which, embedded in the support to be reinforced then beaten in the ground inside said support to be in turn partially buried, brings the whole support-reinforcement to an admissible resistance value.

The present invention therefore has for first object a reinforcement for a support for a road safety barrier, said support being of the profiled type with cross section in
C partially buried in the ground, vertically, and oriented so that the opening of the C is turned on the opposite side to that of the roadway to be protected, the safety barrier being fixed on the upper surface of the support friend in C, either directly or by means of a spacer interposed between the support and the slide, said reinforcement being characterized in that it has the shape of a profile with a straight section in 2 (omega) whose wings, their ends, are spaced by an interval equal to the width of the opening of the C and whose ends of the wing returns are supported on the radii of the C opposite the opening, and in that said profiled reinforcement is beaten into the ground inside the slide support to be partially buried.

 The profiled reinforcement is advantageously sized to have substantially the same inertia module as the support in C.

 According to a preferred form, the two wing returns of the profiled reinforcement are rectilinear; similarly, its two wings are rectilinear and parallel to its longitudinal plane of symmetry.

 According to other particularly advantageous embodiments, the profiled reinforcement is such that its base and its wings emerge from the support to be reinforced by a height between the height of the support to be reinforced and one third of said height; the profiled reinforcement has substantially the same thickness as the support to be reinforced; the profiled reinforcement is obtained by any technique that is now conventional cold profiling, hot profiling or bending.

 A second object of the present invention is a reinforced support for a road safety barrier comprising a cross section of C section buried partially in the ground, vertically, said C section being reinforced by means of the reinforcement as defined above, reinforcement which was beaten in the ground, inside the support in C, to be also partly buried.

 In this support-reinforcement assembly, the height of the reinforcement in = is of the order of 70 to 100 centimeters of which approximately 20 to 50 centimeters are buried, and is preferably of the order of 80 centimeters of which approximately 30 centimeters are buried.

3 To better understand the object of the present invention, there will be described below, by way of purely illustrative and non-limiting example, an embodiment with reference to the accompanying drawing in which
FIG. 1 is a cross-sectional view of a safety barrier shown assembled, section made along the vertical plane of symmetry of the C-shaped support to be reinforced, and
- Figure 2 is a dirty cross-sectional view of the C support reinforced by the section 2 according to the invention, the two sections being shown in their relative cooperation position buried one and the other partly in floor.

 Referring to Figure 1, we see that there is shown a support 1 of slide 2, support which for this purpose is partially buried in the ground 3 and is associated with the slide to be supported by means of a spacer 4 interposed between the support and the slide, and bolted in 5 on the support and in 6 on the slide.

 The support 1 is a section with a cross section at C, visible in detail in FIG. 2. Its overall dimensions are generally 1 × 0 × 50 or 125 × 65.

 Whether the slide 2 is secured to the support 1 directly or via a spacer 4, the support 1 is buried vertically in the ground so that its opening 7 existing between the wing returns 8 and 9 is made vis- opposite is turned on the side opposite to that of the roadway to be protected and thus the slide 2 or the spacer 4 is applied for bolting on the upper surface of the core 10 of said support 1, and that the bolting takes place substantially in the plane ll of longitudinal symmetry of said support.

 All the profiled supports 1 with a straight section at C, including the supports in Corten steel, exhibit excessive oxidation throughout their zone 12 corresponding substantially to level 0 with respect to the ground 3.

To increase the resistance of any support 1 in the event of a vehicle impact, and in the alternative to increase its longevity, the applicant proposes to reinforce said support, whether on the shoulder or on the central reservation, by means of a reinforcement profile 13 with straight section in
A profile having the type of section shown in Figure 2 can be obtained by cold profiling, or by hot profiling or by bending. It is however by cold profiling that it will be most advantageously obtained.

 The shape of the profiled reinforcement 13 has been determined and dimensioned so as to have the same inertia module as the profiled support 1: the reinforcement must therefore provide the support with a resistance of at least 800 daN under the horizontal thrust at the level of retractor 4.

 It is clear then that the resistance of the reinforcement support combination 13 will be considerably increased as long as the support is not fully oxidized in its zone 12. This does not however pose any problem because, due to oxidation, the resistance will always remain lower than the next stiffness step.

 By construction, the wings 14 and 15 of the reinforcement 13 are spaced at their ends by an interval 16 equal to the width of the opening 7 of the support 1. By construction also, the ends, respectively 17 and 18 of the wing returns 19 and 20 are supported on the spokes of the support 1 opposite the opening 7, respectively 21 and 22.

 Like the supports 1 which are beaten in the ground so as to be buried over a height of approximately 80 centimeters for a total height of 150 centimeters, any profiled reinforcement 13 is also beaten in the ground after having been integrated into the support 1 which 'It must reinforce, according to the arrangement shown in Figure 2.

 Depending on the nature of the soil, and according to the additional resistance to ensure the profiled reinforcements 13 will have a height of the order of * / 0 to 100 centimeters, of which approximately 20 to 50 centimeters will be buried, and they will preferably have a height of around 80 centimeters, of which about 30 centimeters will be buried.

 In its most advantageous construction, the two wing returns 19 and 20 of the reinforcement 13 are rectilinear.

Given the dimensions of the profiled support 1, the groove width 7 of which is substantially equal to the height, itself substantially equal to half the width of said profiled support, each wing return then takes place with the friend 10 from the profile support 1 an angle d (alpha) of approximately 600. Similarly, the two wings
14 and 15 are rectilinear t parallel to the longitudinal plane 11 of symmetry of the profiled reinforcement 13.

 The base 23 and the wings 14 and 15 of the reinforcement .13 emerge from the support 1 from a height 24 between the height 25 of the support and ld third of said height.

 Finally, the reinforcement is produced in such a way that it has a thickness substantially equal to that of the support 1 to be reinforced.

 Taking for example a support 1 to be reinforced having an overall dimension of 100 × 50, with a thickness of 5 thousand meters, the profiled reinforcement 13 in oL will advantageously have a thickness of 5 millimeters also, a base width 16 of 46 millimeters, a height d wing of 33 millimeters and a wing return height of 39 millimeters. The overall height of such a profile 13 will then be 70 millimeters, of which approximately 28 millimeters will emerge from the reinforced support 1.

In its preferred embodiment, in which its wings 14 and 15 and its return wings 9 and 20 are all rectilinear, fleshy wing making with the return of the air which extends it an angles of 1200, the reinforcement in Q such that shown in Figure 2 has a development of 177.5 mm and a weight per meter of 7 Kg. Let; values of the moment of inertia and of the 4 module of inertia of such a reinforcement in Q are then IN, = 43.61 cm
3 xx and I / Vxx, = 11.5cm3.

 It is noted that the profiled reinforcement 13 thus designed has an inertia module substantially equal to that of the support 1 having the overall dimensions 100x50.

Using profiled reinforcements 13 of various heights beaten into the ground so as to be sunk 30 cm, various static tests were carried out on a track made available to the plaintiff by the National body of
Road Safety in Satolas, in the Lyon region.

In the first test, a reinforcement 13 of length 60 cm implanted in the ground by 30 cm and therefore having an above-ground height of 30 cm was fitted into a support 1 in
C whose section at ground level had been oxycouge all around except the two wings 8 and 9.

 For a support reinforced in this way by the profile 13, the force at the head of the support increases progressively up to 900 daN for a deformation of 15 cm and 1600 daN for 45 cm ol the rupture of the right wing is observed . The reinforcement 13 folds properly.

 In the second test, a reinforcement 13 in SL 100 cm long was used, 30 cm of which were installed in the ground, embedded inside a support 1 in C oxycut this time over its entire section.

 The force at the head of the support then reaches 875 daN for a displacement of 15 cm and 1150 daN for a displacement of 45 cm. The inclination of the reinforcement 13 under load at 45 cm of displacement is 370 The upper part of the support 1 remains integral with the reinforcement 13 which normally deforms at ground level.

 In the third test, the previous experiment, that is to say the reinforcement of a support 1 totally O-bycouped at the level of the solo was renewed with a reinforcement 13 in length 80 cm including 30 cm buried and 50 cm above ground.

 The force at the head of the support reaches 850 daN for a displacement of 15 cm and 1175 daN for a displacement of 45 cm. The inclination of the reinforcement under load at 45 cm of displacement is then 360.

 This experience is also satisfactory since the upper part of the support 1 remains integral with the reinforcement 13 which normally deforms at the level of the ssl.

 In the fourth test, the same experiment is repeated with a reinforcement 13 100 cm high, 50 cm of which are located in the ground and 50 cm of which are above ground. This type of experiment has the advantage of simulating a more resistant soil.

 The force reaches 900 daN for a deformation of 15 cm. The test was stopped at 1075 daN for a displacement of 38 cm, because the support 1 was spilled due to the core 10 not perpendicular to the thrust of the jack. The reinforcement was then tilted by 310.

 However, the deformation and the effort achieved confirm the positive result of the third test since, in the absence of superelevation, the effort / deformation curve would have been substantially confused with those of the second and third tests.

A fifth test was carried out on a support 1 in galvanized E24, to serve as a reference under the same test conditions as the supports in Corten steel reinforced by the reinforcements in
The force reaches a maximum of 1100 daN for a deformation of 15 cm and drops to 800 daN for 45 cm.

 At the conclusion of the aforementioned static tests, it has been verified that the maximum effort reached during the second, third and fourth tests is at least as high as the maximum reference effort of the fifth test.

 Consequently, the reinforcement 13 enh. 80 to 100 cm in length, 30 to 50 cm of which are located in the ground, gives the support 1 in Corten steel of zero thickness at ground level a resistance generally comparable to that of a support 1 in E24 galvanized under tests static.

 The reinforcement 13 in Q according to the invention therefore leads well to the expected result.

 Naturally, the invention is not limited to the mode of application any more than to the embodiment which have been mentioned and one could conceive of various variants without thereby departing from the scope of the said invention.

 I1 is thus, for example, the height whose wings 14 and 15 and the base 16 of the reinforcement 13 emerge from the support 1. I1 is also the same with the configuration that can take the wing returns 19 and 20 which may be slightly curved symmetrically, their concavities being either oriented towards one another or opposite, and also of the configuration of the part of the reinforcement 13 which emerges from the support 1, the wings 14 and 15 can for example be curved symmetrically, their concavities being oriented towards each other, so that said emerging part has substantially the shape of a sector of a circle.

Claims (10)

1. Reinforcement for a road safety barrier support, said support being of the section type with a straight section in C buried partly in the ground, vertically, and oriented so that the opening of the C is turned on the opposite side to that of the roadway to be protected, the safety barrier being fixed on the upper surface of the support core in C, either directly or by means of a spacer interposed between the support and the slide, the said reinforcement being characterized in that 'it has the shape of a straight section in L (omega) whose wings, at their ends, are spaced by an interval equal to the width of the opening of C and whose ends of the returns of wing rest on the radii of C opposite the opening, and in that the said profiled reinforcement is beaten into the ground inside the slide support to be partially buried. 2. Reinforcement according to claim 1 characterized in that it is dimensioned to have substantially the same inertia module as the support in C. 3. Reinforcement according to any one of claims 1 and 2 characterized in that its two wing returns are rectilinear. 4. Reinforcement according to any one of claims 1 to 3 characterized in that its two wings are rectilinear and parallel to the longitudinal plane of symmetry of said reinforcement. 5. Reinforcement according to any one of claims 1 to 4 characterized in2 that the base and the wings emerge from the support from a height between the height of the support in C and a third of said height. 6. Reinforcement according to any one of claims 1 to 5 characterized in that it has substantially the same thickness as the support in C. 7. Reinforcement according to any one of claims 1 to 6 characterized in that it is obtained by cold profiling, by hot profiling or by folding. 8. Reinforcement according to any one of claims 1 to 7 characterized in that it is dimensioned to ensure a resistance of at least 800 daN under the horizontal thrust at the level of the fixing of the slide on said support. 9. Reinforced support for a road safety barrier comprising a cross section of C section partially buried in the ground, vertically, the said C-shaped profile being reinforced by means of the reinforcement according to any one of claims 1 to 8 which was beaten in the ground, inside the support in C, to be also partly buried. 10. Reinforced support according to claim 9 characterized in that the height of its reinforcement enQ is of the order of 70 to 100 centimeters of which about 20 to 50 centimeters are buried, and preferably of the order of 80 centimeters of which about 30 eentinleters are buried.