EP2423385A2 - Safety barrier for a safety device on a street and method for producing same - Google Patents

Abstract

The guard rail (2) has a section (5) having a certain material thickness, where another section has another material thickness, and the former material thickness is greater than the latter material thickness. The former and the latter sections are arranged and distributed over the entire length of the guard rail. An independent claim is also included for a method for manufacturing a guard rail.

Description

The invention relates to a protective barrier for use on roads. Such guard rails are used as a continuous barrier along a road or between lanes to decelerate, return or stop vehicles off the roadway. The guardrails are usually attached to a post secured in the ground, or can also be connected together. To attach a guard rail to a post or two barriers together usually screw are used.

From the DE 10 2004 034 999 A1 For example, a crash barrier post is known that includes a front support, a rearward slant support, and a footboard for connecting the front support to a foundation. Above the connection between the front support and the diagonal support, a guardrail is fastened by means of flat head screws. The front support, the inclined support and the foot part are made of sheet metal and are produced by stamping and bending process. The foot is thick-walled than the front support and the diagonal support.

From the DE 10 2005 039 705 A1 a Verkehrsleiteinrichtung for attachment to the edge of roadways is known. The guide comprises a plurality of supports connected to the floor, to which an upper guardrail with the interposition of an L-shaped support member and a lower guardrail is attached via a damping element. The supports are connected to the longitudinal reinforcement via a tie rod.

From the DE 100 41 280 A1 For example, a method and apparatus for flexibly rolling a metal strip is known. The metal strip is guided for rolling by a nip formed between a first work roll and a second work roll. In this case, the size of the roll gap is varied in such a way that over the length of the metal strip, strip sections with a greater strip thickness and strip sections with a smaller strip thickness are achieved.

From the DE 10 2009 056 514 A1 For example, there is known a rolling method and a rolling apparatus for producing a metal strip having a thickness varying over its width.

From the DE 2 010 127 A1 a guardrail is known which consists of extruded aluminum alloys and has different wall thicknesses across the width. The guardrail is weakened in the middle and reinforced at the top and bottom. The reinforced edges can be profiled by beads or designed in the form of a solid rounding.

From the DE 1 291 349 A is a road barrier made of an extruded aluminum alloy known. The spar of the road barrier has two channel-shaped parts which protrude against the roadway and are made thicker at the points which first absorb the impact. Also, the upper and lower edges are reinforced for stiffening.

From the CH 449 689 is a road barrier made of composite material known. The surface consists on both sides of thin sheet metal, which is fixedly connected to a between the sheets arranged, in relation to the sheet thickness thick plastic layer. The guardrail is corrugated in cross-section. The thickness of the plastic layer in the region of the wave crest is greater than at the wave edges.

From the GB 1 272 588 is a guardrail with a hollow profile having a smaller thickness than depth and a reinforcing wire extending longitudinally within the profile.

From the DE 20 2004 013 606 U1 is a protective device for a road is known, which has a fixed to the ground pillar, attached to this Leitholm strand of wooden Leitholmen and suspended below the Leitholmstrangs Leitblechstrang. The Leitblechstrang consists of substantially vertically extending, provided with away from the roadway oblique edge strips baffles.

From the EP 1 555 349 A1 a plastic element is known as a protection device for motorcyclists. The plastic element comprises a molded of polymer material hollow body, which can be attached to existing crash barriers. The end portions of the plastic element have a reduced thickness, so that two juxtaposed plastic elements form a uniform profile.

From the EP 0 246 545 A2 a movable guardrail is known, which consists of a series of elements, each element is pivotally mounted centrally on a post.

A problem in the design of crash barriers is that the greatest burden of the crash barrier occurs when a vehicle collides with the bolted connections to the posts anchored in the ground. If the load is too high, the guardrails in the bolt holes can rip out due to bearing fatigue so that the vehicle can come off the road.

The present invention is therefore based on the object to propose a safety barrier for a safety device on a road, which provides reliable protection against tearing of the guard rail from a post of the safety device and can be made at the same time with low material costs. The object is also to propose a corresponding method for producing such a protective barrier for a safety device.

The solution consists in a protective barrier for a safety device on a road, comprising at least a first portion having a first material thickness and at least a second portion having a second material thickness, wherein the first material thickness is greater than the second material thickness. In particular, it is provided that the at least one first section and the at least one second section are distributed over the length of the protective barrier or, in other words, that the protective barrier has a variable material thickness over the length. At least one first or second section means that two or more first sections or two or more second sections can also be provided on a safety barrier.

The advantage of the protective barrier according to the invention is that it can be adjusted individually with respect to the material thickness over the length or over the width to the requirements in terms of strength or rigidity. The dimensioning of the individual sections of the guardrail can be done individually in the individual areas according to the respective loads, so that an oversizing of the guardrail is reduced. By deliberately reducing the thickness of the guardrail in low-load areas material can be saved, so that the guardrail ultimately without any loss in terms of mechanical properties has a low weight and thus can be produced inexpensively. It can be increased by flexible rolling and highly loaded areas of the guardrail with low manufacturing and material costs cost.

According to a preferred embodiment, the ratio between the thinner second material thickness and the thicker first material thickness is between 1/10 and 9/10, preferably between 1/3 or 1/2 as lower limit and 3/4 or 4/5 as upper limit, and is especially between 2/3 and 3/4. In principle, more than two sections with different material thickness are conceivable within a guardrail, for example, three or four sections of different thickness. This applies in particular to protective barriers with height of variable material thickness. If necessary, ratios between the thinnest material thickness and the thickest material thickness of less than 1/2 can be achieved. When using more than two sections with different material thickness, the material thickness of the one or more further sections is preferably smaller than that of the first section and larger than that of the second section. The protective barrier with a variable material thickness is preferably produced by flexible rolling of a metal strip.

According to a first preferred embodiment, it is provided that the material thickness is variable over a length of the protective barrier, so that first and second sections are distributed over the length of the protective barrier. This means that the sections of different material thickness are arranged adjacent to one another in the longitudinal direction. In this case, the protective barrier has a lower material thickness along its length in low-load areas and a greater material thickness in areas subjected to higher loads so that they are purposefully reinforced.

According to a second preferred embodiment, it is provided that the material thickness over a width of the guardrail, that is transversely to the longitudinal extent, is variable, so first and second portions are distributed over the width. This means that the sections of different material thickness are arranged adjacent to each other in the transverse direction. In this case, the protective barrier over its width in low-load areas on a lower material thickness and in higher-loaded areas a greater material thickness, so that they are purposefully reinforced.

According to a third preferred embodiment, which represents a combination of the first and second possibilities, it is further provided that the material thickness is variable over the length and over the width of the guardrail. This means that the protective barrier obtains a three-dimensional structure, wherein first longitudinal sections are provided with different material thickness, which are arranged adjacent to each other in the longitudinal direction, and at least one of the longitudinal sections in the transverse direction, that is over the width of the protective barrier, a plurality of width sections having different material thickness , The latter embodiment achieves maximum flexibility with regard to the adaptability of the protective barrier to the stress.

According to a preferred embodiment, which applies to all of the above-mentioned embodiments, is between in each case two sections with different material thickness a transition section is provided in which the material thickness varies over the length or across the width. It is provided in particular that the material thickness decreases steadily in the transition section between the thicker first portion and the thinner second portion. If appropriate, it is also necessary to provide transition sections between the first or second section and one or more further sections. Each individual section preferably has an at least substantially constant wall thickness in the direction of extent of the respective section, that is to say in the longitudinal or in the transverse direction. Between two adjacent sections with approximately constant wall thickness, a transition section is provided in each case with a variable wall thickness in the direction of extent.

For the above-mentioned first embodiment with over the length of variable thickness of the guardrail is preferably that the transition section has a shorter length, ie extension along the guardrail, as the thicker first section. Furthermore, it is preferably provided that the first section has a smaller length or extension along the protective barrier than the thinner second section.

According to a preferred embodiment, which applies to all of the abovementioned embodiments, at least one first through-opening is provided in the first section or in at least one further section. This first passage opening is used in particular for attaching the guardrail to a post of the safety device. The attachment is preferably carried out by means of a screw, wherein a screw is inserted through the through hole of the guard rail and a corresponding hole in the post and bolted by a nut. In this case, the attachment of the guardrail to the post can also be done with the interposition of a damping element that can absorb part of the impact energy. Usually, the passage openings for attaching the guard rails are arranged on the post approximately centrally with respect to the width of the guardrail. The passage openings are designed in particular in the form of elongated holes. In principle, however, they can also have any other desired contour.

For a high rigidity or strength of the protective barrier, it is advantageous if a cross section through the first section or the further section, specifically in the region of the at least one first passage opening, has a cross-sectional area which is at least one cross-sectional area of a cross section through the second section equivalent. This means that the cross-sectional area of the cross-section through the guard rail in the region of the passage opening is equal to or greater than the cross-sectional area of the cross-section through the guard rail in a region which has no passage opening or other weakening zone. This applies both to the embodiment with over the length of the protective barrier of variable thickness, as well as for the embodiment with the width of the protective barrier of variable thickness, as well as for the combination of both embodiments.

This preferably also applies to further sections of the protective barrier, in which further, second passage openings are provided. The second passage openings may be arranged in the longitudinal direction at a distance from the first passage opening. In this case, in particular a plurality of second passage openings can be provided over the width of the guardrail. These second passage openings are used in particular for connecting two guard rails together. The connection is preferably carried out by means of screw.

With regard to the second passage openings, it is also preferable for the cross-sectional area to at least correspond to a cross-sectional area through the portion in which the second passage openings are arranged through the second section. This means that the cross-sectional area through the guard rail in the region of the second passage opening is equal to or greater than the cross-sectional area through the guard rail in the area which has no passage opening or other weakening zone.

Together with one or more posts, the protective barrier according to the invention forms a safety device. In such a safety device, the posts are advantageously designed with a variable material thickness, which is preferably produced by flexible rolling of a metal strip.

• Walzen eines Bleches, wobei erste Abschnitte mit einer ersten Materialdicke und zweite Abschnitte mit einer zweiten Materialdicke über eine Erstreckungsrichtung der Schutzplanke erzeugt werden, wobei die erste Materialdicke größer ist als die zweite Materialdicke. Die Erzeugung der Kontur der Schutzplanke kann durch Rollprofilieren oder Tiefziehen erfolgen. Vorzugsweise erfolgt ein Einbringen von zumindest einer Durchgangsöffnung in die Schutzplanke in einem Abschnitt mit größerer Materialdicke, insbesondere im ersten Abschnitt.

The solution to the above object is further in a method for producing a safety barrier for a safety device on a road with the following method steps:

• Rolling a sheet, wherein first portions are produced with a first material thickness and second portions with a second material thickness over a direction of extension of the protective barrier, wherein the first material thickness is greater than the second material thickness. The generation of the contour of the guardrail can be done by roll profiling or deep drawing. Preferably, at least one passage opening is introduced into the guardrail in a section of greater material thickness, in particular in the first section.

The advantages of the method according to the invention consist, as already explained above, in the fact that it is possible to produce safety barriers which, with respect to their material thickness, are adapted to the requirements with regard to the load in the event of an impact. With optimum utilization of the material used, the protective barriers according to the invention can withstand the same or higher loads as conventional protective barriers with a uniform material thickness, the weight and thus the costs being significantly reduced.

The production of the different material thicknesses can take place according to a first possibility by means of flexible rolling, wherein over the length of the workpiece different material thicknesses are produced. According to an alternative or additional possibility, strip profiling rolling of a sheet can be provided as method step. With the strip profile rolling, the material thickness of the sheet is changed across the width. In particular, this makes it possible to produce a protective barrier which has a greater material thickness in width sections in which one or more through holes are to be introduced than in width sections adjacent thereto in cross section. The strip profile rolling can be done before, during or after roll profiling or deep drawing.

After a third possibility, both a flexible rolling and a strip rolling can be performed. This creates a workpiece with variable wall thickness over the length and over the width. With the third possibility arises the greatest possible flexibility with regard to the design of the thickness ranges over the length or the width of the guardrail.

According to a possible embodiment, as a further method step for the production of the protective barrier, a heat treatment is provided which can take place between or after the individual method steps. However, it is also conceivable that after the flexible rolling, after the strip profile rolling or roll profiling no heat treatment is performed, but that the guardrail is used in hard-rolling condition. This has a higher strength in the thin section or sections than in the thick sections. In this respect, the non-heat-treated protective barrier is both thickness and strength optimized.

Figur 1

eine erfindungsgemäße Schutzplanke in einer ersten Ausführungsform mit über der Länge variabler Materialdicke in perspektivischer Ansicht;

Figur 2

die Schutzplanke nach Figur 1 in Seitenansicht;

Figur 3

den Verlauf der Materialdicke der Schutzplanke nach Figur 1 über der Länge;

Figur 4

den Bereich, an dem die Schutzplanke nach Figur 1 an einem Pfosten befestigt ist, im Detail;

Figur 5

eine erfindungsgemäße Schutzplanke in einer zweiten Ausführungsform mit über der Breite variabler Materialdicke in perspektivischer Ansicht;

Figur 6

einen Teilabschnitt der Schutzplanke nach Figur 5;

Figur 7

die Schutzplanke nach Figur 5 im Querschnitt gemäß Schnittlinie VII-VII aus Figur 6;

Figur 8

den Dickenverlauf der Schutzplanke nach Figur 5 über der Breite;

Figur 9

eine erfindungsgemäße Schutzplanke in einer dritten Ausführungsform mit über der Länge und über der Breite variabler Materialdicke in perspektivischer Ansicht;

Figur 10

die Schutzplanke nach Figur 9 im Querschnitt durch den ersten Abschnitt;

Figur 11

den Dickenverlauf der Schutzplanke nach Figur 10 im ersten Abschnitt über der Breite;

Figur 12

die Schutzplanke nach Figur 9 im Querschnitt durch den zweiten Abschnitt;

Figur 13

den Dickenverlauf der Schutzplanke nach Figur 10 im zweiten Abschnitt über der Breite;

Figur 14

eine erfindungsgemäße Schutzplanke in einer vierten Ausführungsform mit über der Länge und über der Breite variabler Materialdicke in perspektivischer Ansicht;

Figur 15

die Schutzplanke nach Figur 14 in einem Querschnitt durch den ersten Abschnitt;

Figur 16

den Dickenverlauf der Schutzplanke nach Figur 15 im ersten Abschnitt über der Breite;

Figur 17

die Schutzplanke nach Figur 14 in einem Querschnitt durch den zweiten Abschnitt; und

Figur 18

den Dickenverlauf der Schutzplanke nach Figur 15 im zweiten Abschnitt über der Breite.

Preferred embodiments will be explained below with reference to the drawing figures. Hereby shows:

FIG. 1

a protective barrier according to the invention in a first embodiment with over the length of variable material thickness in a perspective view;

FIG. 2

the protective barrier after FIG. 1 in side view;

FIG. 3

the course of the material thickness of the guardrail after FIG. 1 over the length;

FIG. 4

the area where the guard rail after FIG. 1 attached to a post, in detail;

FIG. 5

a protective barrier according to the invention in a second embodiment with over the width variable material thickness in a perspective view;

FIG. 6

a subsection of the protective barrier after FIG. 5 ;

FIG. 7

the protective barrier after FIG. 5 in cross section according to section line VII-VII FIG. 6 ;

FIG. 8

the thickness of the protective barrier after FIG. 5 across the width;

FIG. 9

a protective barrier according to the invention in a third embodiment with over the length and the width of variable material thickness in a perspective view;

FIG. 10

the protective barrier after FIG. 9 in cross section through the first section;

FIG. 11

the thickness of the protective barrier after FIG. 10 in the first section across the width;

FIG. 12

the protective barrier after FIG. 9 in cross-section through the second section;

FIG. 13

the thickness of the protective barrier after FIG. 10 in the second section across the width;

FIG. 14

a protective barrier according to the invention in a fourth embodiment with over the length and the width of variable material thickness in a perspective view;

FIG. 15

the protective barrier after FIG. 14 in a cross section through the first section;

FIG. 16

the thickness of the protective barrier after FIG. 15 in the first section across the width;

FIG. 17

the protective barrier after FIG. 14 in a cross section through the second section; and

FIG. 18

the thickness of the protective barrier after FIG. 15 in the second section across the width.

The FIGS. 1 to 4 will be described together below. There is shown a safety barrier 2 according to the invention for a safety device 3 which are mounted along roadways for motor vehicles and serve for protection if vehicles deviate from the roadway. For this purpose, individual guard rails 2 are detachably connected to each other and attached via posts 4 along a roadway.

In FIG. 1 is a single guardrail 2, which may also be referred to as a guardrail, in perspective view and in FIG. 2 shown in side view. The protective barrier 2 is made of a steel material by forming. The protective barrier 2 comprises at its ends in each case a first section 5 with a first material thickness D5 and an intermediate second section 6 with a second material thickness D6, which is smaller than the material thickness D5 of the end-side first sections. Between the thicker first section 5 and the thinner second section 6, a transition section 7 is formed in each case, in which the material thickness steadily decreases starting from the thicker section in the direction of the thinner section. The first section 5 extends over a length L5, the second section 6 over a length L6 and the transition section 7 over a length L7. The length L7 of the transition section 7 is shorter than the length L5 of the thicker first section 5.

How out FIG. 3 can be seen, showing the thickness profile of the protective barrier 2 over the length, the ratio of the material thickness D6 of the thinner second portion 6 to the material thickness D5 of the thicker portion 5 is about 2 to 3, wherein here other thickness ratios would be conceivable, for example, between 1 to 2 to 4 to 5 can lie. Due to the variable thickness of the protective barrier 2 over the length of the guard rail 2 can be adjusted individually to the requirements in terms of strength or rigidity. It is understood that other thicknesses than the thickness profile shown are conceivable. For example, in addition to or as an alternative to the first sections 5, at the ends of the guardrail 2 are formed, also one or more thicker first portions are provided in the central region of the guardrail. These can be arranged in particular in the areas in which the guardrail is to be attached to a post. It is also conceivable that the thickness profile of the guardrail is designed approximately wave-shaped, that is, that the material thickness decreases in each case from the thicker first sections, then reaches a minimum and increases again following the minimum towards the next thicker first section. In this case, the second section would be formed in the region of the minimum and shortened to a minimum length. In contrast, the transition sections would be formed with a continuous change in thickness over the length correspondingly long.

The protective barrier 2 has distributed over its length a plurality of through holes 8, which are designed in particular in the form of slots. These passage openings 8 are arranged approximately centrally with respect to the width of the protective barrier 2 and serve for attaching the protective barrier 2 to a post 4, which in turn is anchored in the ground. The connection between the guardrail 2 and the post 4 via screw that are not shown here. The passage openings 8 are distributed at regular intervals over the length of the protective barrier 2. In each case, only a single first passage opening 8 is located in each cross-sectional plane. The material thickness D5 in the thicker first section 5, in which the first passage opening 8 is provided for attachment to the post 4, is in particular designed such that the cross-sectional area in a sectional plane E1 in which the first passage opening 8 is located, is equal to or greater than the cross-sectional area through the guard rail 2 in a plane E2, in which no passage opening is present. This embodiment results in a high rigidity or strength of the protective barrier 2 in the connection region, so that it is prevented in the event of an impact that the protective barrier 2 tears and is separated from the post 4 here.

In addition to the first through holes 8, second through holes 9 are provided at the end portions of the guard rail 2. In each case a plurality of second passage openings 9 are arranged distributed over the width of the guardrail 2. These second passage openings 9 serve for fastening two Guard rails 2 together. The attachment is usually done by means of screw. It can be seen that in the present case two rows of second through-openings 9 are provided at each end of the protective barrier 2, of which a first row lies on one side of the first through-opening 8 and a second row lies on the other side of the first through-opening 8.

For the material thickness in the region of the second passage openings 9, it is also preferable that the cross-sectional area of the guardrail in a plane E3 in which the second passage openings 9 are arranged be equal to or greater than the cross-sectional area of the guard rail 2 in the plane E2 in which there are no holes or other weakening zones are provided. This results in the second through holes 9 sufficient strength of the guardrail 2, which prevents the guardrail 2 is torn in an impact of a motor vehicle.

The present embodiment of the guard rail 2 with variable length material thickness is preferably made by flexibly rolling a sheet metal strip. After the flexible rolling, the sheet metal strip is cut to length according to the desired length and the passage openings for fixing the protective barrier 2 to a post 4 or more guard rails 2 are inserted into one another in the sheet metal. The contour of the protective barrier 2 is produced by roll profiling or deep drawing. After the flexible rolling, a heat treatment can be provided as a further process step. The heat treatment can take place between or after the individual process steps.

The FIGS. 5 to 8 show a protective barrier 2 'according to the invention in a second embodiment. This corresponds in many parts to those according to the FIGS. 1 to 3 , so that reference is made to the above description in terms of similarities.

The peculiarity of the present embodiment is that the guardrail 2 'across the width has a variable material thickness, as best shown in FIGS FIGS. 7 and 8 can be seen, a section along the line VII-VII in FIG 6, and show the thickness over the width of the guardrail 2 '. It can be seen that the guardrail 2 'is designed mirror-symmetrically with respect to the center plane M, which applies both in relation to the contour and with respect to the thickness profile. In this respect, only the upper half is labeled here and will be described. The same applies to the lower half. However, it is also conceivable that the protective barrier with respect to the plane M has an asymmetrical configuration of the thickness profile over the width. It is also conceivable that the profile of the guardrail in cross-section considered asymmetrical.

The protective plank 2 "has a first section 11 with a first material thickness D11, which represents the largest material thickness of the protective plank 2" and can be, for example, 3 mm. Furthermore, a second section 12 with the smallest wall thickness D12 can be seen, which is formed on the outer edge of the protective plank 2 ", which can have, for example, a wall thickness of 2 mm.

Considering the course of thickness starting at the upper end of the guardrail 2 'in the figure, this has the thickness D12 at its upper end. After a first radius, the material thickness in the transition section 13, which has a variable thickness D13 in the transverse direction, increases from the thickness D12 to the thickness D11 of the first section 11. In this case, the thickness profile of the transition section 13 is continuous. The first section 11 has a curved portion, which points in the assembled state in the direction of the roadway, and an adjoining straight portion which extends at an angle in the direction of the center plane. Subsequent to the section 11 with the greatest wall thickness D11 again includes a transition section 15 with a decreasing in the direction of the center plane M wall thickness D15. After the transition section 15 with a continuously decreasing thickness D15, a bent section 14 with a significantly reduced thickness D14 follows. This bent portion 14, which may also be referred to as the third portion, for example, has a thickness of 2.5 mm. A transition section 17 with a wall thickness D17 increasing in the direction of the center plane M again adjoins the bent section 14. The transition portion 17 is relatively short, in particular shorter than the outer adjacent curved portion 14 or the inner adjoining central portion 16. The middle portion 16, which can also be referred to as the fourth section has the thickness D16. This is approximately the same as the largest thickness D11 of the first portion 11. It is understood that the central portion 16 may also have the thickness D11, as the first portion 11. The further course of the material thickness results from the symmetry of the protective barrier. The sections 11, 16 of greater material thickness alternate with the sections 12, 14 of smaller thickness. In each case, differently extended ramp-like transition sections 13, 15, 17 are arranged.

The protective barrier 2 'according to the invention according to the present embodiment is preferably produced by means of strip profile rolling of a sheet. With the strip profile rolling, the material thickness of the sheet is changed across the width. The band profile rolling can be done before, during or after the roll profiling or deep drawing, with which the contour of the guardrail is generated.

In the FIGS. 9 to 13 3 shows a third embodiment of a protective barrier 2 "according to the invention, in which the thickness of the material is varied both over the length and across the width The course of the thickness over the length with a middle second section 6 and two edge-side first sections 5 and Interposed transition regions 7 corresponds approximately to that in the FIG. 3 illustrated course. The variation of the thickness across the width of the guardrail 2 "corresponds to that in the FIG. 8 illustrated course. This is represented by the specification of sections with the thicknesses D11 to D17. The respective sections extend along the protective barrier 2 ", over the first section 5", the transition section 7 "and the second section 6".

The three-dimensional structure of the material thickness over the protective barrier 2 "results from a combination of the thickness profiles according to the Figures 3 and 8th , In this respect, the present embodiment according to the FIGS. 9 to 13 a combination of the two embodiments mentioned above. With regard to the similarities can therefore be made to the corresponding descriptions. The present embodiment has the thickest thickness profile across the width in the section 5 ", the corresponding cross section through the section 5" being in FIG FIG. 10 shown. In this case, within the longitudinal section 5 "of the transverse section 11 have a thickest material thickness of 3.0 mm, while the thinnest transverse section 12 may have a material thickness of 2.0. The second longitudinal section has the same thickness over the cross section, only at a slightly lower level. That is, all sections 12 ', 13', 11 ', 15', 14 ', 17', 16 'of the second longitudinal section 6 "have a slightly smaller material thickness D12', D13 ', D11', D15 ', D14', D17 ', D16' as the corresponding sections 12, 13, 11, 15, 14, 17, 16 of the first longitudinal section 5 ". In this case, the thickness difference may be 0.5 to 1.0 mm, for example. In the transition section 7 ", a corresponding ramp-like transition takes place between the respectively longitudinally adjacent longitudinal sections 12, 12 ', 13, 13', etc.

The production of the protective barrier 2 "is effected by the combination of the method steps of flexible rolling, by means of which a band with variable wall thickness is produced with thicker first sections 5, transition sections 7 and thinner second sections 6, and strip profile rollers, by means of which subsequently sections 11, 12, 13, 14, 15, 16, 17 are produced over the width of different thickness.

In the FIGS. 14 to 18 There is shown a fourth embodiment of a protective barrier 2 '"according to the invention, in which the thickness of the material is varied over both the length and the width FIGS. 9 to 13 so that in terms of the similarities to the above description, and thus to the description of the FIGS. 1 to 8 Reference can be made.

The course of the thickness over the length with a middle second portion 6 '"and two edge-side first portions 5'" and arranged therebetween transition regions 7 '"corresponds approximately to that in the FIG. 3 illustrated course. The variation of the thickness across the width of the guardrail 2 '"in the second section 6'" corresponds to that in the FIG. 8 illustrated course. This is represented by the specification of sections with the thicknesses D11 to D17. The respective sections extend along the guardrail 2 "', over the second section 6"'.

The present embodiment has the thickest thickness profile across the width in the section 5 " FIG. 10 , which shows a cross-section through the section 5 '", recognizable that the protective barrier 2'" here over the entire width of a constant maximum thickness D5 "'. That is, the individual transverse sections 12", 13 ", 11", 15 ", 14", 17 "and 16" all have the same thickness D5 "', which may be 3.0 mm, for example.

The guardrail 2 '"has in the second section 6''' the same thickness profile over the cross section, as in the embodiment according to the FIGS. 5 to 8 , In the transition section 7 ", a corresponding ramp-like transition takes place between the respectively longitudinally adjacent sections 12", 13 ", etc. of the first longitudinal section 5 '''and the corresponding sections 12'',13'', etc. of the second longitudinal section 6''.

The production of the protective barrier 2 "is effected by the combination of the method steps flexible rolling, by means of which a band over the length of variable wall thickness with thicker first sections 5, transition sections 7 and thinner second sections 6 is generated, and strip profile rollers, by means of the subsequently in the second longitudinal section The sections 11 "', 12"', 13 "', 14"', 15 "', 16"', 17 "'with over the width of different thickness are produced.

It is understood that the embodiments shown are only exemplary in terms of the thickness profiles over the length or the width. Of course, other thickness profiles over the length or over the width are conceivable. For example, another protective barrier could also be designed such that in the first section 5 it has a profile with a width which is variable over the width, as shown in FIG FIG. 8 is shown, and in the second section 6 has a constant thickness over the width, as in the embodiment according to the FIGS. 1 to 4 , A transition section 7 would connect the thicknesses of the first and second sections accordingly. The ratio between the thinner second material thickness and the thicker first material thickness may be between 1/10 and 9/10, preferably between 1/3 and 4/5 or 1/2 and 4/5, and is in particular between 1/3 and 3 / 4, or between 2/3 and 3/4.

All of the protective barriers according to the invention described above have the advantage that they can be adapted individually with respect to the material thickness over the length or over the width to the requirements in terms of strength or rigidity. By deliberately reducing the thickness of the guardrail in low-load areas material can be saved, so that the guardrail ultimately without any loss in terms of mechanical properties has a low weight and thus can be produced inexpensively.

LIST OF REFERENCE NUMBERS

2

guardrail

3

safety device

4

post

5

first section

6

second part

7

Transition section

8th

first passage opening

9

second passage opening

11

first section

12

second part

13

Transition section

14

third section

15

Transition section

16

fourth section

17

Transition section

D

thickness

e

level

L

length

M

midplane

Claims (15)

A sheet metal guardrail (2, 2 ', 2 ") for a safety device on a road, comprising at least a first portion (5, 11) with a first material thickness (D5, D11) and at least a second portion (6, 12) with a second material thickness (D6, D12),
wherein the first material thickness (D5, D11) is greater than the second material thickness (D6, D12),
characterized
in that the at least one first section (5) and the at least one second section (6) are distributed over the length of the protective barrier (2). Safety barrier according to claim 1,
characterized,
in that the ratio between the second material thickness (D6, D12) and the first material thickness (D5, D11) is between 1/3 and 3/4, and in particular 2/3. Safety barrier according to one of the preceding claims,
characterized,
in that at least one of the first and second sections (5, 6) has a variable thickness over the width of the guardrail (2). Safety barrier according to claim 3,
characterized,
in that at least one first transverse section (11) with a greater material thickness (D11) and at least one second transverse section (12) with a smaller material thickness (D12) are formed in the section (5, 6) of variable thickness width. Safety barrier according to one of the preceding claims,
characterized,
in that at least one further section (14, 16) with a material thickness (D14, D16) is provided, wherein the material thickness (D14, D16) of the further section (14, 16) is smaller than the first material thickness (D5, D11) and larger is the second material thickness (D6, D12). Safety barrier according to one of the preceding claims,
characterized,
in that the at least one first section (5) and / or the at least one second section (6) and / or the at least one further section (14, 16) have a constant material thickness (D5, D6, D14, D16) over the length. Safety barrier according to one of the preceding claims,
characterized,
in that a respective transition section (7, 13, 15, 17) is provided between the at least one first section (5, 11) and the at least one second section (6, 12) or the at least one further section (14, 16). Safety barrier according to one of the preceding claims,
characterized,
that the transition section (7, 13, 15, 17) has a smaller extension along the guardrail (2, 2 ', 2 ") than the first portion (5, 11). Safety barrier according to one of the preceding claims,
characterized,
that the change in the material thickness (D7, D13, D15, D17) of the at least one transition section (7, 13, 15, 17) between a subsequent section (5, 11, 16) of greater material thickness (D5, D11, D16) and a subsequent Section (6, 12, 14) of smaller material thickness (D6, D12, D14) runs steadily. Safety barrier according to one of the preceding claims,
characterized,
that the first section (5, 5 ") has a smaller extension along the guardrail (2, 2") than the second portion (6, 6 "). Safety barrier according to one of the preceding claims,
characterized,
that in the first section (5, 11) or in at least one further portion (14, 16) at least a first through hole (8) is provided. Safety barrier according to one of the preceding claims,
characterized,
that a cross section through the first portion (5) or the at least one further portion (16) has a cross sectional area in the region of a first through hole (8) which at least corresponds to a cross-sectional area of a cross section through the second section (6). Safety barrier according to one of the preceding claims,
characterized,
that the first material thickness (D5, D16) is selected such that a stiffness of the first portion (5) or the at least one further portion (16) corresponds at least to the region of a first through opening (8) of a stiffness of the second section (6). Method for producing a safety barrier for a safety device on a road according to one of Claims 1 to 13, with the following method steps: Flexible rolling of a sheet, wherein first portions (5, 11) are produced with a first material thickness and second portions (6, 12) having a second material thickness in the longitudinal direction of the protective barrier, wherein the first material thickness is greater than the second material thickness. Method for producing a protective barrier according to Claim 14,
characterized,
in that the sheet after the flexible rolling is deformed at least in sections by means of strip profile rolls, wherein at least a first transverse section (11) with a greater material thickness (D11) and at least a second transverse section (12) with a smaller material thickness (D12) are produced in the transverse direction of the protective barrier ,

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