EP3918133A1 - Road restraint system with elements for anchorage of the poles to improve performance - Google Patents

Road restraint system with elements for anchorage of the poles to improve performance

Info

Publication number
EP3918133A1
EP3918133A1 EP20701620.5A EP20701620A EP3918133A1 EP 3918133 A1 EP3918133 A1 EP 3918133A1 EP 20701620 A EP20701620 A EP 20701620A EP 3918133 A1 EP3918133 A1 EP 3918133A1
Authority
EP
European Patent Office
Prior art keywords
pole
ground
tie rod
restraint system
poles
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.)
Pending
Application number
EP20701620.5A
Other languages
German (de)
French (fr)
Inventor
Mario Bruni
Claudio Angelo Ardemagni
Davide BENETTON
Sergio Marco BASSI
Matteo BERNARDINI
Marco Anghileri
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.)
Crashtech Srl
Iniziative Nazionali Autostradali - SINA SpA Soc
Original Assignee
Crashtech Srl
Iniziative Nazionali Autostradali - SINA SpA Soc
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
Application filed by Crashtech Srl, Iniziative Nazionali Autostradali - SINA SpA Soc filed Critical Crashtech Srl
Publication of EP3918133A1 publication Critical patent/EP3918133A1/en
Pending legal-status Critical Current

Links

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
    • E01F15/00—Safety arrangements for slowing, redirecting or stopping errant vehicles, e.g. guard posts or bollards; Arrangements for reducing damage to roadside structures due to vehicular impact
    • E01F15/02—Continuous barriers extending along roads or between traffic lanes
    • E01F15/04—Continuous barriers extending along roads or between traffic lanes essentially made of longitudinal beams or rigid strips supported above ground at spaced points
    • E01F15/0461—Supports, e.g. posts
    • 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
    • E01F15/00—Safety arrangements for slowing, redirecting or stopping errant vehicles, e.g. guard posts or bollards; Arrangements for reducing damage to roadside structures due to vehicular impact
    • E01F15/02—Continuous barriers extending along roads or between traffic lanes
    • E01F15/04—Continuous barriers extending along roads or between traffic lanes essentially made of longitudinal beams or rigid strips supported above ground at spaced points
    • E01F15/0476—Foundations
    • 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
    • E01F15/00—Safety arrangements for slowing, redirecting or stopping errant vehicles, e.g. guard posts or bollards; Arrangements for reducing damage to roadside structures due to vehicular impact
    • E01F15/02—Continuous barriers extending along roads or between traffic lanes
    • E01F15/12—Continuous barriers extending along roads or between traffic lanes and having means for providing occasional passage, e.g. for emergency vehicles

Definitions

  • the present invention relates, in general, to the field of road restraint systems. More specifically, the subject of the invention is to implement a device for maintaining the performances of a road restraint system when the resistance of the ground in which the system is set varies. The invention also relates to a method to improve the performances of both existing and newly installed road restraint systems.
  • a road restraint system is understood to be any device designed to contain vehicles and/or reduce stresses on occupants through mechanisms of energy absorption and/or redirection of the same in the event of impact.
  • Restraint systems therefore constitute an effective means of restraining and redirecting vehicles in a safe manner.
  • the barrier has to deform so as to mitigate the intensity of the impact by presenting the vehicle with a surface that remains regular and without roughness during the deformation, dissipating the impact energy and returning it to the vehicle as little as possible.
  • Road safety barriers typically consist of one or more longitudinal elements (or strips, or blades) supported by a plurality of poles (or piers, or uprights).
  • the posts are planted in the ground or restrained to the edge of a structure, such as for example a bridge, retaining wall or the like.
  • the strips behave like beams on many supports, wherein the supports are made up of poles. The latter are, therefore, the components of the barrier that absorb and dissipate the impact energy, discharging it to the ground, while the strips have the function of distributing the load on the poles, in addition naturally of providing the support surface for the impacting vehicle.
  • each pole In its function as a support for a barrier subject to the impact of a vehicle, each pole generally works mainly by bending, usually well beyond its elastic limits.
  • the object of the invention is to eliminate, or at least render ineffectual, the disadvantages of the restraint systems of the prior art.
  • one object of the invention is to guarantee the correct functioning of road restraint systems (according to EN 1317), i.e. safety barriers, shock absorbers, terminals, transitions and closures of openings, even in the case of different piling land (in particular more yielding) with respect to TT conditions (Type Testing, definition of "CPR-Regulation of construction products”), i.e. conditions different from those in the test field, also in situations where the road restraint system is fixed on a raised edge without escarpment, e.g. on the back of supporting walls which are usually not able to guarantee the restraint performances equal to those corresponding to the TT conditions.
  • TT conditions Type Testing, definition of "CPR-Regulation of construction products”
  • One positive aspect of the present invention is that of exploiting a system of improvement of the performances of the fixed restraints that can also be installed retrofitted, since it can be mounted directly and with minimum effort on the restraint systems already present on the road (retrofit) without the need for processes that could modify the original structure of the road restraint systems themselves.
  • Yet another object of the invention is to provide such a road restraint system that allows the results set to be obtained in a simple and economical manner.
  • the road restraint system comprises a plurality of poles or uprights driven into the ground and joined together by at least one longitudinal element, wherein anchoring elements of the posts are provided, designed to restore the restraint and energy absorption performances of the system in the event of impact.
  • Said anchorage elements comprise a small plate embedded in the ground.
  • the plate is mounted at the end of a tie rod. When it is installed, the plate is rotated by the tie rod and a preload is transmitted to the tie rod itself, thanks to the ability of the plate rotated in the ground to resist this preload.
  • the tie rod at the other end, is connected to the upright of the restraint system. When the upright is stressed by an impact, it discharges the impact force to the ground, through the tie rod and the plate, in such a way as to maintain performances equivalent to those recorded under TT conditions.
  • FIG. 1 and 2 are schematic views in perspective, respectively from the rear and front of a road restraint system, in particular a conventional safety barrier;
  • FIGs 3 and 4 are schematic views in perspective from the rear and front of the road restraint system of Figures 1 and 2, provided with anchorage elements according to the invention, with the underground parts shown in transparency;
  • - Figure 5 is a cross-sectional view of the structure of Figures 3 and 4;
  • FIG. 6 and 7 are views in perspective, from opposite angles, of a possible device for attachment of the anchorage components to a pole of the restraint system;
  • FIG. 8 and 9 are perspective views from different angles of a different device for attachment of the anchorage elements to a pole of the restraint system;
  • FIG. 10 is a plan view of the attachment device of Figures 8 and 9; - Figures 11 a), b), c) are schematic views showing successive stages in the insertion of an anchorage device into the ground.
  • FIGS 1 and 2 schematically show a road restraint system, in particular a safety barrier, denoted as a whole by reference numeral 10, consisting, in its essential elements, of poles or uprights 11 (hereinafter referred to as poles) fixed in the ground, and a longitudinal element or strip 12 (hereinafter referred to as strip) that joins poles 11 and from which it is held at a distance by spacer and energy dissipator elements 13.
  • any road restraint system such as shock absorbers, terminals, transitions, closures of openings and the like, comprising elements fixed in the ground joined by at least one longitudinal element.
  • anchorage elements 20 of the posts are provided with the aim of restoring the restraint and energy absorption performances of the system in the event of impact.
  • Anchors 20, which are of the commercial type are inserted into the ground (the surface of which is schematically shown in Figures 3-7, and denoted by reference numeral 30) without the need for drilling, excavation or cement works, providing a safe installation, with short installation times and relatively low costs even for already existing solutions.
  • the anchorage elements 20 are made up of a plate 21, suitably shaped to allow a simple driving in the ground, a driving pole 22 and a tie rod 23 that allows the rotation of the plate and the transmission of the load to the ground.
  • the driving pole 22 is removed (Fig. l ib) and then, by tensioning the tie rod 23, the plate 21 is rotated until it is perpendicular to the direction of the load (Fig. 11 c). Once the anchorage 20 is in position the system is able to react to the loads resulting from an impact against the restraint system.
  • the invention sets out to exploit the ability of the anchors 20 described above to function effectively even in soils with poor mechanical properties with the aim of restoring the containment and energy absorption performances of the road restraint system in the event of an impact.
  • the strip 12 connects the poles 11 with the aim of transferring thereto the load due to the impact, while the anchors 20 interact with the poles 11 with the aim of increasing the capacity of the system to effectively discharge these loads to the ground.
  • anchors of this type since, thanks to their geometric conformation, it is possible to install them in such a way as to position the plate 21 (the main element of the device, which discharges the stress deriving from the tie rod to the ground) in an area of land below the carriageway ( Figures 3-5), wherein the mechanical features of the soil are generally better and more uniform.
  • the anchors 20 would be inserted into the ground in proximity of each pole 11 of the road restraint system (or, genetically, fixing point with the ground 30), which needs to increase the resistance of the driven restraint, directing the plate 21 below the road surface.
  • the number of anchors 20 to be used for each pole 11 of the system can be defined case by case, for each application, so as to identify the optimal solution according to local conditions
  • the connection between the anchorage elements 20 and the poles 11 is formed at a lower elevation with respect to the main longitudinal elements, or strips 12 of the restraint system.
  • the vertical installation position of the anchors 20 is considered to be that at the base of the poles 11 , meaning by this statement a position in proximity of the ground 30 (not only in contact with the soil, nominal condition, but also in proximity of the same above or below, in the latter case with the anchoring elements completely covered by the ground).
  • the anchorage elements can be restrained simply with cables or with different fixed or detachable fixing elements causing the plate to rotate first and then the preload to rise.
  • Figures 6 to 10 show, by way of example, two types of attachment of the anchors 20 to the poles 11.
  • Figures 6 and 7 schematically show the use of two anchors 20 for each pole 11, in which the respective tie rods 23 are arranged on both sides of the pole and traverse a tubular transverse connection bar 40, arranged on the back of the pole. Fastening is by means of bolts 41, which are screwed onto the threaded ends of the tie rods 23, tensioning them appropriately and causing the plate 21 to rotate first and then the preload to rise.
  • Figures 8-10 show the use of a single anchor per pole.
  • a cage 50 that wraps the pole 11, consisting in this case of two equal and opposed plates 51, substantially U-shaped, having one leg 52 shorter than the other 53 and slightly recessed, so as to be able to couple and determine a substantially square structure surrounding pole 11.
  • the two plates are fastened by means of bolts 54 and nuts 55.
  • a collar 56 is welded, suitable for housing, depending on the assembly orientation, the threaded end of a tie rod 23 for the fastening and tensioning of the same by means of nuts 57, with consequent rotation of the plate 21 first and then the rise of the preload.
  • the stress from the crash is discharged to the ground through the posts 11.
  • the proper functioning of the system depends on the reaction and on the behaviour of the ground itself.
  • the pole rotates without deforming correctly and without absorbing the impact energy.
  • the problem is solved because, when an impact occurs and the deformation of the barrier is discharged onto a pole, the presence of the anchorage point allows the base of the pole to be supported.
  • the support provided at the base of the pole makes it possible to re-establish a condition equivalent to that of the ground with adequate features of resistance and therefore serves to ensure the proper functioning of the restraint system.

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Refuge Islands, Traffic Blockers, Or Guard Fence (AREA)

Abstract

Road restraint system (10) comprising a plurality of poles or uprights (11) fixed in the ground and joined together by at least one longitudinal element (12) and anchoring elements (20) of the poles (11) designed to restore system containment and energy absorption performances in the event of impact, wherein said anchoring elements (20) comprise a plate (21) driven into the ground and rotatably mounted at one end of a tie rod (23) whose other end is constrained to a pole (11), such that the tensioning of said tie rod (23) first causes the rotation of the plate (21) until it is perpendicular to the load direction.

Description

"ROAD RESTRAINT SYSTEM WITH ELEMENTS FOR ANCHORAGE OF THE POLES TO IMPROVE PERFORMANCE".
DESCRIPTION
The present invention relates, in general, to the field of road restraint systems. More specifically, the subject of the invention is to implement a device for maintaining the performances of a road restraint system when the resistance of the ground in which the system is set varies. The invention also relates to a method to improve the performances of both existing and newly installed road restraint systems.
A road restraint system is understood to be any device designed to contain vehicles and/or reduce stresses on occupants through mechanisms of energy absorption and/or redirection of the same in the event of impact.
Restraint systems therefore constitute an effective means of restraining and redirecting vehicles in a safe manner.
Considering, by way of a non-limiting example, the case of impact between the vehicle and the safety barrier, the barrier has to deform so as to mitigate the intensity of the impact by presenting the vehicle with a surface that remains regular and without roughness during the deformation, dissipating the impact energy and returning it to the vehicle as little as possible.
Road safety barriers typically consist of one or more longitudinal elements (or strips, or blades) supported by a plurality of poles (or piers, or uprights). The posts are planted in the ground or restrained to the edge of a structure, such as for example a bridge, retaining wall or the like. In the event of impact, the strips behave like beams on many supports, wherein the supports are made up of poles. The latter are, therefore, the components of the barrier that absorb and dissipate the impact energy, discharging it to the ground, while the strips have the function of distributing the load on the poles, in addition naturally of providing the support surface for the impacting vehicle.
It follows that the performances of a road safety barrier depend very much on the behaviour of the poles, which in turn depends on the consistency of the ground in which the poles are driven or on the resistance of the connections and of the edge of the structure to which the poles are restrained.
In its function as a support for a barrier subject to the impact of a vehicle, each pole generally works mainly by bending, usually well beyond its elastic limits.
At present, road restraint systems, in order to be installed on a road, must follow a certification procedure which, according to the requirements of the standard EN 1317, comprises several experimental crash tests carried out at accredited test fields.
The certification tests on barriers whose poles are driven into the ground are generally carried out on areas of land with good and uniform mechanical and performance features. Subsequent road installations of restraint systems take place however on areas of land with different conformation and consistency compared to those of the certification tests, with a wide spectrum of variability, thus making the behaviour of the restraint system different with respect to that of the certification crash tests.
This can create dangerous situations in the event of a vehicle impacting against the restraint system, which might not perform the retention task for which it was designed.
OBJECT OF THE INVENTION
The object of the invention is to eliminate, or at least render ineffectual, the disadvantages of the restraint systems of the prior art.
In particular, one object of the invention is to guarantee the correct functioning of road restraint systems (according to EN 1317), i.e. safety barriers, shock absorbers, terminals, transitions and closures of openings, even in the case of different piling land (in particular more yielding) with respect to TT conditions (Type Testing, definition of "CPR-Regulation of construction products"), i.e. conditions different from those in the test field, also in situations where the road restraint system is fixed on a raised edge without escarpment, e.g. on the back of supporting walls which are usually not able to guarantee the restraint performances equal to those corresponding to the TT conditions.
One positive aspect of the present invention is that of exploiting a system of improvement of the performances of the fixed restraints that can also be installed retrofitted, since it can be mounted directly and with minimum effort on the restraint systems already present on the road (retrofit) without the need for processes that could modify the original structure of the road restraint systems themselves. Yet another object of the invention is to provide such a road restraint system that allows the results set to be obtained in a simple and economical manner.
These and other objects of the invention are achieved by the road restraint system and by the method for improving the performances of a road restraint system which have the features set out in the appended independent claims 1 and 9 respectively.
Advantageous embodiments of the invention are disclosed by the dependent claims.
Substantially, the road restraint system according to the invention comprises a plurality of poles or uprights driven into the ground and joined together by at least one longitudinal element, wherein anchoring elements of the posts are provided, designed to restore the restraint and energy absorption performances of the system in the event of impact. Said anchorage elements comprise a small plate embedded in the ground. The plate is mounted at the end of a tie rod. When it is installed, the plate is rotated by the tie rod and a preload is transmitted to the tie rod itself, thanks to the ability of the plate rotated in the ground to resist this preload. The tie rod, at the other end, is connected to the upright of the restraint system. When the upright is stressed by an impact, it discharges the impact force to the ground, through the tie rod and the plate, in such a way as to maintain performances equivalent to those recorded under TT conditions.
BRIEF DESCRIPTION OF THE DRAWINGS Further features of the invention will be made clearer by the detailed description that follows, referred to its purely non-limiting example embodiments, illustrated in the accompanying drawings, in which:
- Figures 1 and 2 are schematic views in perspective, respectively from the rear and front of a road restraint system, in particular a conventional safety barrier; - Figures 3 and 4 are schematic views in perspective from the rear and front of the road restraint system of Figures 1 and 2, provided with anchorage elements according to the invention, with the underground parts shown in transparency; - Figure 5 is a cross-sectional view of the structure of Figures 3 and 4;
- Figures 6 and 7 are views in perspective, from opposite angles, of a possible device for attachment of the anchorage components to a pole of the restraint system; - Figures 8 and 9 are perspective views from different angles of a different device for attachment of the anchorage elements to a pole of the restraint system;
- Figure 10 is a plan view of the attachment device of Figures 8 and 9; - Figures 11 a), b), c) are schematic views showing successive stages in the insertion of an anchorage device into the ground.
DESCRIPTION OF PREFERRED EMBODIMENTS
Figures 1 and 2 schematically show a road restraint system, in particular a safety barrier, denoted as a whole by reference numeral 10, consisting, in its essential elements, of poles or uprights 11 (hereinafter referred to as poles) fixed in the ground, and a longitudinal element or strip 12 (hereinafter referred to as strip) that joins poles 11 and from which it is held at a distance by spacer and energy dissipator elements 13.
Although this detailed description refers in particular to a safety barrier, the invention is extended to any road restraint system, such as shock absorbers, terminals, transitions, closures of openings and the like, comprising elements fixed in the ground joined by at least one longitudinal element.
According to the invention, anchorage elements 20 of the posts are provided with the aim of restoring the restraint and energy absorption performances of the system in the event of impact. Anchors 20, which are of the commercial type, are inserted into the ground (the surface of which is schematically shown in Figures 3-7, and denoted by reference numeral 30) without the need for drilling, excavation or cement works, providing a safe installation, with short installation times and relatively low costs even for already existing solutions.
As schematically shown in Figures 11 a)-c), the anchorage elements 20 are made up of a plate 21, suitably shaped to allow a simple driving in the ground, a driving pole 22 and a tie rod 23 that allows the rotation of the plate and the transmission of the load to the ground.
Once the plate 21 has been inserted into the ground using conventional hydraulic or pneumatic equipment at the desired depth (Fig. 1 la), the driving pole 22 is removed (Fig. l ib) and then, by tensioning the tie rod 23, the plate 21 is rotated until it is perpendicular to the direction of the load (Fig. 11 c). Once the anchorage 20 is in position the system is able to react to the loads resulting from an impact against the restraint system.
The invention sets out to exploit the ability of the anchors 20 described above to function effectively even in soils with poor mechanical properties with the aim of restoring the containment and energy absorption performances of the road restraint system in the event of an impact. The strip 12 connects the poles 11 with the aim of transferring thereto the load due to the impact, while the anchors 20 interact with the poles 11 with the aim of increasing the capacity of the system to effectively discharge these loads to the ground.
Furthermore, it is intended to use anchors of this type since, thanks to their geometric conformation, it is possible to install them in such a way as to position the plate 21 (the main element of the device, which discharges the stress deriving from the tie rod to the ground) in an area of land below the carriageway (Figures 3-5), wherein the mechanical features of the soil are generally better and more uniform. In fact, by way of example, the anchors 20 would be inserted into the ground in proximity of each pole 11 of the road restraint system (or, genetically, fixing point with the ground 30), which needs to increase the resistance of the driven restraint, directing the plate 21 below the road surface. The number of anchors 20 to be used for each pole 11 of the system, one or more, can be defined case by case, for each application, so as to identify the optimal solution according to local conditions The connection between the anchorage elements 20 and the poles 11 is formed at a lower elevation with respect to the main longitudinal elements, or strips 12 of the restraint system. The vertical installation position of the anchors 20 is considered to be that at the base of the poles 11 , meaning by this statement a position in proximity of the ground 30 (not only in contact with the soil, nominal condition, but also in proximity of the same above or below, in the latter case with the anchoring elements completely covered by the ground).
In order not to modify the original structure of the restraint system 10 (positive aspect in the case of retrofitting of the anchors to road restraint systems already in place), for example with holes or welds, the anchorage elements can be restrained simply with cables or with different fixed or detachable fixing elements causing the plate to rotate first and then the preload to rise. Figures 6 to 10 show, by way of example, two types of attachment of the anchors 20 to the poles 11.
In particular, Figures 6 and 7 schematically show the use of two anchors 20 for each pole 11, in which the respective tie rods 23 are arranged on both sides of the pole and traverse a tubular transverse connection bar 40, arranged on the back of the pole. Fastening is by means of bolts 41, which are screwed onto the threaded ends of the tie rods 23, tensioning them appropriately and causing the plate 21 to rotate first and then the preload to rise. Figures 8-10 show the use of a single anchor per pole.
In this case a cage 50 is provided that wraps the pole 11, consisting in this case of two equal and opposed plates 51, substantially U-shaped, having one leg 52 shorter than the other 53 and slightly recessed, so as to be able to couple and determine a substantially square structure surrounding pole 11. The two plates are fastened by means of bolts 54 and nuts 55. On the longest leg 53 of each plate 51 a collar 56 is welded, suitable for housing, depending on the assembly orientation, the threaded end of a tie rod 23 for the fastening and tensioning of the same by means of nuts 57, with consequent rotation of the plate 21 first and then the rise of the preload.
FUNCTIONING From a general point of view, taking as an example the case of a road barrier with poles driven into the ground, as shown in the drawings, the functioning of the device is linked to the fact that, by introducing a constraint element 20 at the base of the poles 11, able to support independently of the ground wherein the load resulting from the impact is installed, conditions of constraint similar to TT (Type Testing) conditions are restored.
During the impact of a vehicle against the road restraint system, the stress from the crash is discharged to the ground through the posts 11. In the case of posts driven into the ground, the proper functioning of the system depends on the reaction and on the behaviour of the ground itself. In the case wherein the ground does not have sufficient features of resistance to allow it to adequately discharge the load deriving from the restraint system pole, the pole rotates without deforming correctly and without absorbing the impact energy.
With the introduction of the anchors 20 driven into the ground the problem is solved because, when an impact occurs and the deformation of the barrier is discharged onto a pole, the presence of the anchorage point allows the base of the pole to be supported. The support provided at the base of the pole makes it possible to re-establish a condition equivalent to that of the ground with adequate features of resistance and therefore serves to ensure the proper functioning of the restraint system.
Naturally the invention is not limited to the particular embodiments described previously and illustrated in the accompanying drawings, but numerous detailed changes may be made thereto within reach of the person skilled in the art, without thereby departing from the scope of the invention itself, as defined in the appended claims.

Claims

1. Road restraint system (10) comprising a plurality of poles or uprights (11) fixed in the ground and joined together by at least one longitudinal element (12) and anchoring elements (20) of the poles (11) designed to restore system containment and energy absorption performances in the event of impact,
characterised in that said anchoring elements (20) comprise a plate (21) driven into the ground and rotatably mounted at one end of a tie rod (23) whose other end is constrained to a pole (11), such that the tensioning of said tie rod (23) first causes the rotation of the plate (21) until it is perpendicular to the load direction and then the rise of the preload so that there is resistance to the pole displacement in case of impact, in order to restore a pole constraint corresponding to the Type Testing (TT) condition.
2. Restraint system according to claim 1, wherein said anchoring elements (20) are constrained to the poles (11) in contact with the ground, or in proximity to the ground, above or below it
3. Restraint system according to claim 1 or 2, wherein said tie rod (23) of the anchoring element (20) has a threaded end inserted in a collar (56), carried by a cage (50) enveloping said pole (11), with which thread it engages at least one nut (57) for fixing and tensioning the tie rod, with consequent rotation of the plate (21) and application of preloading in the tie rod.
4. Restraint system according to claim 3, wherein said cage (50) consists of two equal and opposite plates (51), substantially U-shaped, having one leg (52) shorter than the other (53) and slightly retracting, so as to be able to couple and determine a substantially square structure surrounding the pole (11), fixing the two plates by means of bolts (54) and nuts (55). 5. Restraint system according to claim 4, wherein on the longer leg (53) of each plate
(51) a collar (56) is welded, designed to house said threaded end of a tie rod (23), according to the assembly orientation.
6. Restraint system according to claim 1 or 2, characterised in that two anchoring elements (20) are provided for each pole (11), wherein the respective tie rods (23) are arranged on the two sides of the pole and traverse a tubular transversal element (40) for connection, arranged on the back of the pole, the fixing being made by means of bolts (41), which screw onto threaded ends of the tie rods (23) tensioning them appropriately and causing the plate (21) to rotate. 7. Road restraint system (10) according to any one of the preceding claims, consisting of a safety barrier, a shock absorber, a terminal, a transition, a closure of openings or the like.
8. Method for improving the performances of a road restraint system (10) comprising a plurality of poles (11) fixed in the ground and joined by at least one longitudinal element (12), consisting in arranging, at some of said poles (11) at least, anchoring elements (20) comprising a plate (21) rotatably mounted at one end of a tie rod (23) which is inserted into the ground by means of a driving pole (22), subsequently removed, the other end of the tie rod (23) ) being constrained to the pole (11) with means which produce tensioning of the tie rod and rotation of the plate (21) until it is perpendicular to the load direction and giving a desired preload to said tie rod.
9. Method according to claim 8, wherein said other end of the tie rod (20) is constrained to the pole (11), at a lower level with respect to said at least one longitudinal element (12), in contact with the ground, or in proximity of the ground, above or below it.
EP20701620.5A 2019-01-29 2020-01-28 Road restraint system with elements for anchorage of the poles to improve performance Pending EP3918133A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT201900001311 2019-01-29
PCT/EP2020/052059 WO2020157074A1 (en) 2019-01-29 2020-01-28 Road restraint system with elements for anchorage of the poles to improve performance

Publications (1)

Publication Number Publication Date
EP3918133A1 true EP3918133A1 (en) 2021-12-08

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP20701620.5A Pending EP3918133A1 (en) 2019-01-29 2020-01-28 Road restraint system with elements for anchorage of the poles to improve performance

Country Status (2)

Country Link
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WO (1) WO2020157074A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT201900018344A1 (en) * 2019-10-09 2020-01-09 Geosistemi S R L Ground reinforcement auxiliary device and related ground reinforcement method by means of this auxiliary device
US20230407584A1 (en) * 2020-11-09 2023-12-21 Stratec Rt Gmbh S.R.L Road equipped with road safety barriers fixed to the ground and installation method thereof

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2196290A (en) * 1936-09-16 1940-04-09 Eugene V Camp Highway guardrail construction
US2227958A (en) * 1936-09-29 1941-01-07 Eugene V Camp Traffic guard
CH419214A (en) * 1965-01-20 1966-08-31 Gysi Ag Geb Guard rail arrangement with profiled guard rails
IT201700074885A1 (en) * 2017-07-04 2019-01-04 Mariano Pernetti ANCHORAGE DEVICE TO THE GROUND FOR SECURITY ROAD BARRIER POLES

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