EP3098351A1 - Dispositif de fixation pour glissières et procédé de liaison des glissières utilisant un tel dispositif - Google Patents

Dispositif de fixation pour glissières et procédé de liaison des glissières utilisant un tel dispositif Download PDF

Info

Publication number: EP3098351A1
Authority: EP; European Patent Office
Prior art keywords: guardrail; speed; piston; extension; elastic means
Prior art date: 2015-05-29
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.): Granted

Application number

EP16171353.2A

Other languages

German (de)

English (en)

Other versions

EP3098351B1 (fr

Inventor

Emanuele BURZI

Mauro Monteleone

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.)

Ticopter SA

Original Assignee

Ticopter SA

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.)

2015-05-29

Filing date

2016-05-25

Publication date

2016-11-30

2016-05-25 Application filed by Ticopter SA filed Critical Ticopter SA

2016-11-30 Publication of EP3098351A1 publication Critical patent/EP3098351A1/fr

2018-01-31 Application granted granted Critical

2018-01-31 Publication of EP3098351B1 publication Critical patent/EP3098351B1/fr

Status Active legal-status Critical Current

2036-05-25 Anticipated expiration legal-status Critical

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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
- E01F15/0407—Metal rails
- E01F15/0423—Details of rails

Definitions

the present invention generally refers to the sector of road safety devices, and in detail concerns a guardrail fixing device.
the present invention also concerns a method of junction of guardrail portions by means of the above device.
guardrail for protecting roads.
guardrails are subject to be joined by so-called “joints” for ensuring the continuity of protection along the entire length of the road.
the traditional joints are nothing more than simple bars provided with slotted holes, that neither provide the right safety nor allow for a correct adaptation to the thermal dilation of the guardrail.
the guardrails are subject to two macrotypes of deformations, macrotypes that are based on the deformation speed itself.
the first macrotype is exactly the thermal dilation, that is a type of deformation which is very slow.
the second macrotype instead, is the deformation due to impact, characterized in contrast to a significantly higher speed.
guardrail junction systems of a more advanced type, one of which is produced by Freyssinet. It deals with a junction realized with a pre-contraction strand, permanently anchored to an end of the device on a first steel block (so-called passive) arranged in a junction between two guardrails.
the device furthermore comprises a second block, so-called active, fixed to the adjacent junction.
the strand, that passes also through the active block, is prolonged also over this last in such a way to allow the operation of the junction in normal conditions, being therefore capable of freely move within the active block without impeding the opening or closure of the junction of the barrier.
the device produced by Freyssinet is complex and lowly effective in managing the blockage of the two guardrail portions in casa of impact.
the scope of the present invention is therefore to describe a guardrail fixing device that allows to solve aforementioned drawbacks.
a further scope of the present invention is to describe a method of junction of guardrail portions which allows to solve the aforementioned drawbacks and advantageously allows to meet the guardrail thermal dilations or contractions without for this leaving space for failures or risk that the vehicle exits from portions of road wherein said guardrail misses.
a fixing device for guardrails suitable of being interposed between a first and a second portion of guardrail, characterized in that it comprises at least one first configuration of lower longitudinal extension and a second configuration of greater extension, wherein said second configuration of greater extension takes place when said device is longitudinally stretched following an impact of a vehicle against one of said two guardrail portions;
said device comprises elastic means operating in combination with a hydromechanic organ linearly extensible and causing a selective blocking of the longitudinal extension on said second configuration of greater extension according to a speed and/or impulse of force exerted between a first and a second end of said device, and in particular when said speed and/or impulse of force exerted exceeds a predetermined threshold value realizing an inertial block.
said device comprises furthermore a piston linearly extensible secured in correspondence of a first end thereof to an end of said device and to a second end thereof opposed to said first end, in correspondence of said elastic means on a rotating support in turn secured to said elastic means.
said device is characterized in that said threshold value is determined in accordance to a retention force exerted by said elastic means and by a viscous friction force exerted by said piston.
said rotating support is pivoted on the body of said fixing device; said pivoting takes place on a pin arranged in such a way to detect a rotation axis orthogonal respective to a plane onto which said device extends between said first and said second configuration.
said means of selective blocking further comprises a teethed bar, having a first and a second end; in said first end said bar comprises a plurality of teeth suitable for being engaged on an blocking arm of said rotating support, wherein said blocking arm has a terminal portion opposed respective to the portion jointed to the principal body of said rotating support provided with at least an engagement tooth; in said second end said teethed bar is jointed to an extensible plunger of said piston.
said teethed bar linearly moves on a predefined path and moves parallel to said piston.
said blocking arm engages on said plurality of teeth when said speed and/or impulse of force exerted exceed a predetermined threshold value, with an extension of said piston causing a compression and/or extension of said elastic means.
said elastic means are configured for keeping said supporting element in a neutral position centrally defined respective to a plurality of unstable positions wherein said support rotates respective to said neutral position, said supporting element being capable of pivoting respective to said neutral position centrally defined.
said piston comprises a plunger secured to a first end of said device in turn configured for being rigidly jointed to a first portion of guardrail; said device comprises a principal body detecting a second end opposed to said first end, said second end being joined to a second portion of guardrail.
said device - in correspondence of the said first and second end - comprises fixing plates respectively to said first and second portion of guardrail; said fixing plates comprising a plurality of holes suitable for housing means of pivoting on said guardrail portions.
a method of junction of guardrail portions characterized in that it comprises the installation of the device according to the present invention, further characterized in that it comprises, before the step of installation of said device between a first and a second portion of guardrail not connected each other, a step of calculation of a speed of thermal dilation of said guardrail portions, a subsequent step of calculation of speed of deformation of at least one of said guardrail portions following an impact of the vehicle against thereto, said speed of deformation being calculated in relation to the position of said device with said guardrail; said method comprising furthermore a step of calculation of a maximum threshold speed or force impulse such that to cause said blockage of longitudinal extension of said device in accordance to said speed of deformation and in accordance to an elastic constant of said elastic means in combination to a coefficient of viscosity of said hydromechanic organ linearly sliding, so that a speed of deformation below said threshold keeps said device free to extend.
said method comprises a step of calculation of a an angle of rotation necessary to said arm of said supporting element for coming into contact with said plurality of teeth of the said teethed bar, and a calculation of a coefficient of compression and/or extension of at least one of said elastic means in accordance to said rotation angle.
the device 100 comprises a principal body 101 a boxed structure detecting a first end wherein there is a plate 102 of fixing to a first portion of guardrail.
the plate 102 develops along a plane which is orthogonal respective to that of the principal body, and is provided with holes 103, positioned on its four edges, for introducing the pins or equivalent means of engagement and fixing on the guardrail itself.
a piston 120 Inside the principal body 101 is furthermore comprised a piston 120, provided with a cylinder fixed to said principal body and a plunger linearly extensible respective to said cylinder. Said plunger ends in an end thereof opposed respective to that which is introduced in the cylinder, on a second end of the device in turn provided with a plate 102, laying on the same plane of the other plate 102 and as it possessing a plurality of holes 103 positioned on its four edges for the introduction of pins or equivalent means of engagement and fixing to the guardrail itself.
the plate 102 is jointed to the plunger of the piston 120 by means of a bracket 104a that is oriented orthogonally respective to the plate itself thereby resulting among the other jointed to this last, and that is provided with a hole for the engagement with the piston.
a bracket 104a that is oriented orthogonally respective to the plate itself thereby resulting among the other jointed to this last, and that is provided with a hole for the engagement with the piston.
the relative position of plunger or cylinder of the piston shall not be intended as limiting, in fact so that the elements could be in contrast installed - cylinder secured to the second end of the device and plunger secured to principal body 101 of the device 100 - without modifying the operation of the device object of the present invention.
the device 100 object of the present invention is therefore linearly extensible, between at least one first and a second position, in such a way to being capable to adapt in joining exactly in correspondence of the plates 102 a couple of guardrail portions whose distance could not be always equal.
Figures 1 and 3 show respective configurations of a minimum and maximum linear extension of the device 100 object of the present invention in a resting condition, that is not being "photographed" in a dynamic motion condition of its mobile portions.
the cylinder of the piston 120 is jointed to the principal body 101 not directly but with the interposition of a supporting element 150 rotating respective to a pin fixed on the principal body and extending along a direction orthogonal respective to the direction and the plane along which the device 100 is capable of linear extend therein.
the supporting element 150 pivots respective to a central resting position, onto which is retained by two opposed springs 140, each one having a first end directly fastened on the principal body 101 and a second end fastened to a wing 170 of said supporting element 150.
the two springs 140 preferably but in a non-limiting extent are of the same type, for ensuring that the force of rotation of the supporting element 150 respective to the central position is equivalent into both the clockwise and anticlockwise rotation direction (this last being defined by the arrow A in figure 3 ).
any rotated position of the supporting element 150 - both in clockwise that in anti-clockwise direction - is per se unstable, since the force of compression and respectively extension exerted by the springs 140 on the wing 170 is so that the supporting element 150 tends to return into the same starting position.
the supporting element 150 comprises a teethed arm that is suitable for engaging on a teethed portion 104d of a teethed bar 104.
the teethed bar 104 is arranged below than the supporting element 150, and the arm 151 faces towards said lower direction on a side of the supporting element 150 that, once observed the annexed figures, results being on its left side.
the constraint of the piston 120 on the supporting element takes further place on the opposite side, and that is from the right.
the teethed bar 104 extends at least partially within said principal body 101 and has an end portion opposed respective to the teethed portion 104d that is jointed to the plate 102 of the second end of the device object of the present invention, and is therefore further jointed also to the terminal portion of the stem of the plunger of the piston 120.
the teethed portion 104d of the said teethed bar 104 faces towards the arm 151 of the supporting element 150.
the device 100 object of the present invention therefore operates on a selective blocking of the elongation of the first end respective to the second.
Said selective blocking is an inertial block generated according to an action of force of extension exerted on the device 100 and a contrasting action to the extension itself operated by the assembly of the piston 120 and of the springs 140 with the rotating supporting element 150.
Said selective blocking allows for causing a free adaptation of the length of the device 100 object of the present invention to the extension or contraction of the guardrails due to a thermal dilation, but at the same time allows for blocking the elongation of the device in case of impact of a vehicle against the guardrail or against the device itself.
the thermal excursion and impact elongation are characterized by an elongation speed (for example in mm/h) and impulse of force strongly different, in the order of 100 or more times.
the speed of extension of a guardrail following of impact is closer to the magnitude order of a meter per second than to some mm/h as in the case of the thermal dilation.
a threshold of intervention for the selective blocking that is a threshold of maximum speed or impulse of force, is scientifically calculated in accordance to the viscosity and force which is necessary to extend the piston 120 in relation to the force of compression and extension (elastic constant) of the springs 140.
the speed and impulse force caused by the thermal elongation or contraction of the guardrail is such that it causes a traction force on the plate 102 of the second end so that to extend the piston 120 without causing a compression/extension of the springs 170 that causes a rotation of the supporting element 150 so that to make the arm 151 rotate up to engage on the teethed portion 140d of the teethed bar 140.
the device object of the present invention finds itself therefore in a first configuration of free extension, wherein the means of selective blocking in accordance to a speed and impulse of force do not become operative for blocking the longitudinal extension of the device 100 itself.
the rotation of the supporting element for causing the blockage it is therefore performed a step of calculation of a an angle of rotation necessary to said arm of said supporting element 150 for coming into contact with the plurality of teeth 104d of the teethed bar 104, further calculating a coefficient of compression and/or extension of at least one of said elastic means or springs 140 in accordance to said rotation angle.
the speed of elongation or the impulse of force are such that the viscosity of extension of the piston 120 exceeds that of the compression/extension of the springs 140, that consequently cause a rotation in anti-clockwise direction (arrow A, figure 3 ) of the arm 151 of the supporting element 150 so that to render its end engaged on the teethed portion 104d of the teethed bar 104.
the device 100 object of the present invention is furthermore reusable.
the rotating supporting element 150 returns into the resting position wherein the forces of the two counterposed springs equal one another, and the arm 151 rigidly jointed thereto disengages the teethed bar 104, that can newly return to extend or include itself within the principal body in accordance to thermal compression or dilation phenomena of the guardrail portions thereto jointed on the plates 102.
said device automatically returns into the first configuration wherein it supports the thermal dilation or contraction of the guardrail portions, without needing human intervention.

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

EP16171353.2A 2015-05-29 2016-05-25 Dispositif de fixation pour glissières et procédé de liaison des glissières utilisant un tel dispositif Active EP3098351B1 (fr)

Applications Claiming Priority (1)

Application Number	Priority Date	Filing Date	Title
ITUB2015A000967A ITUB20150967A1 (it)	2015-05-29	2015-05-29	Dispositivo di fissaggio per guardrail e metodo di giunzione di porzioni di guardrail impiegante il detto dispositivo.

Publications (2)

Publication Number	Publication Date
EP3098351A1 true EP3098351A1 (fr)	2016-11-30
EP3098351B1 EP3098351B1 (fr)	2018-01-31

Family

ID=53901019

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
EP16171353.2A Active EP3098351B1 (fr)	2015-05-29	2016-05-25	Dispositif de fixation pour glissières et procédé de liaison des glissières utilisant un tel dispositif

Country Status (3)

Country	Link
EP (1)	EP3098351B1 (fr)
ES (1)	ES2665360T3 (fr)
IT (1)	ITUB20150967A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
AT344778B (de) *	1975-10-24	1978-08-10	Vmw Ranshofen Berndorf Ag	Dehnfugenverbindung fuer leiteinrichtungen bei leitschienen, gelaendern u.dgl.
EP0687774A1 (fr) *	1993-03-09	1995-12-20	Freyssinet International Et Cie	Perfectionnements aux dispositifs pour relier horizontalement entre elles des lisses de sécurité ou pièces analoques
GB2497811A (en) *	2011-12-22	2013-06-26	Versco Ltd	A connector for forming a movement joint between vehicle restraint or barrier members

2015
- 2015-05-29 IT ITUB2015A000967A patent/ITUB20150967A1/it unknown
2016
- 2016-05-25 EP EP16171353.2A patent/EP3098351B1/fr active Active
- 2016-05-25 ES ES16171353.2T patent/ES2665360T3/es active Active

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
AT344778B (de) *	1975-10-24	1978-08-10	Vmw Ranshofen Berndorf Ag	Dehnfugenverbindung fuer leiteinrichtungen bei leitschienen, gelaendern u.dgl.
EP0687774A1 (fr) *	1993-03-09	1995-12-20	Freyssinet International Et Cie	Perfectionnements aux dispositifs pour relier horizontalement entre elles des lisses de sécurité ou pièces analoques
GB2497811A (en) *	2011-12-22	2013-06-26	Versco Ltd	A connector for forming a movement joint between vehicle restraint or barrier members

Also Published As

Publication number	Publication date
ITUB20150967A1 (it)	2016-11-29
EP3098351B1 (fr)	2018-01-31
ES2665360T3 (es)	2018-04-25

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