EP0877122B1 - Boucle de dissipation d'énergie et barrière dynamique d'arrêt de chûtes de pierres comprenant de telles boucles de dissipation d'énergie - Google Patents
Boucle de dissipation d'énergie et barrière dynamique d'arrêt de chûtes de pierres comprenant de telles boucles de dissipation d'énergie Download PDFInfo
- Publication number
- EP0877122B1 EP0877122B1 EP98480032A EP98480032A EP0877122B1 EP 0877122 B1 EP0877122 B1 EP 0877122B1 EP 98480032 A EP98480032 A EP 98480032A EP 98480032 A EP98480032 A EP 98480032A EP 0877122 B1 EP0877122 B1 EP 0877122B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cable
- fuse
- energy dissipation
- support cable
- support
- 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.)
- Expired - Lifetime
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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
- E01F7/00—Devices affording protection against snow, sand drifts, side-wind effects, snowslides, avalanches or falling rocks; Anti-dazzle arrangements ; Sight-screens for roads, e.g. to mask accident site
- E01F7/04—Devices affording protection against snowslides, avalanches or falling rocks, e.g. avalanche preventing structures, galleries
- E01F7/045—Devices specially adapted for protecting against falling rocks, e.g. galleries, nets, rock traps
Definitions
- the present invention relates to stopping falls from stones on sloping ground and in particular a dynamic rockfall stop barrier in which the carrying cables have loops of energy dissipation.
- Fall protection barriers stones generally consist of a net held by posts across the predicted path of the stones on sloping ground.
- the net consists of cables metallic, for example stainless steel, the wefts of which can slide relative to each other at the level of knots and mechanically linked by stirrup cable ties.
- the net is supported by guy wires connected to poles whose the feet can be fixed or articulated at the level of their foundation in the ground, the posts being stabilized by cables anchored in the ground upstream and downstream.
- the net has a faculty of relative displacement conferred by organs of limited resistance link which are cables placed between the net and upstream anchors, which include traction limiting devices likely to leave spin portions of spare cable between jaws tightened so as to dissipate part of the energy by friction.
- organs of limited resistance link which are cables placed between the net and upstream anchors, which include traction limiting devices likely to leave spin portions of spare cable between jaws tightened so as to dissipate part of the energy by friction.
- the traction limiters fail when the sliding between the jaws reaches the end of its travel.
- the object of the invention is to provide a dynamic rockfall stop barrier in which loops using fusible cables allow the dissipation of kinetic energy due to the impact of blocks without causing the breakage of the carrying cables.
- the main object of the invention is therefore a loop of energy dissipation for dynamic barrier stopping rock fall of the type comprising a net disposed between posts anchored to the ground and held in place with cables carriers connecting the posts to support plates anchored to the ground; said loop comprising a cable carrier and a fusible cable of a length determined having, with respect to the carrying cable, a reduced elastic limit and a modulus lower elasticity, the cable fuse comprising at each end a blocking means connecting the fuse cable and the cable carrying so that at rest the length of the fuse cable located between the locking means is significantly less than the length of the carrying cable located between the locking means, and each of the blocking means being intended to block the fuse cable on the carrying cable after the carrying cable has been subjected to a tensile force due to a fall of stones so that the fuse cable subsequently suffers a tensile force first causing its elongation and then its rupture.
- Another object of the invention is a barrier dynamic rockfall stop comprising a set of energy dissipation loops according to the invention arranged in parallel or a set of dissipation loops of energy according to the invention arranged in series or a combination of the two.
- a dynamic barrier according to the invention is installed along a contour line and looks like illustrated in Figures 1 and 2.
- a metal net is secured to the ground by means of posts anchored to the ground and held by carrying cables 14 and guy lines 16 anchored on the ground by means of support plates 18 and anchors.
- energy dissipation kinetics is carried out initially thanks to the mesh particular of the net which allows, during the impact, to make slide the cables forming the frame.
- the supporting cables which can as in the example illustrated in figure 1, form a triangle using two pulleys 20 or recesses located at the bottom and at the top of the posts 12, collect after the shock of the block most of kinetic energy acquired by the block and therefore must be equipped with energy dissipation mechanisms.
- These mechanisms are loops with fusible cables as we will see, and can be, according to modes individuals carrying out the invention, loops mounted in parallel 22 or 24 or loops mounted in series 26.
- FIG. 3 A first embodiment of a loop of energy dissipation is shown in Figure 3.
- the loop includes a fuse cable 30 which can slide with the carrying cable 14 in two sliding means such as sliding sleeves 32 and 34 generally made of aluminum in which the two cables are clamped against each other according to a greater or lesser clamping force determining the friction resistance to be opposed to a force of traction exerted on the carrying cable 14.
- a stop sleeve 36 or 38 At each end of the fuse cable 30 is a stop sleeve 36 or 38, generally made of aluminum fixed on the cable.
- AT the inside of the loop 40 formed by the carrying cable 14 find two other stop sleeves 42 and 44 fixed on the carrier cable 14.
- the left part is identical to the first mode of realization, but on the right side, there is only one blocking sleeve 46 which blocks together the carrying cable 14 and the fuse cable 30.
- everything is therefore passes in the manner described with reference to the first mode illustrated in FIG. 3, while for the right side, there is blockage from the start.
- the fuse cable 30 is stretched, elongated and breaks when the sliding sleeve 32 is in abutment on the stop sleeve 36.
- the two right and left parts have also locking sleeves 46 and 48.
- the cable fuse 30 goes directly into traction lengthens and breaks.
- the loop 40 of the carrying cable must have a length such that when the sleeves sliding stops on the stop sleeve (s) in the embodiments of Figures 3 and 4 or immediately in the embodiment of Figure 5, the length of the fuse cable 30 is less than the length of the part of the carrying cable between the two locking points.
- the length of the loop 40 should not be is too large to prevent an acceleration too much of the carrying cable when the fuse cable.
- a larger loop 40 must be provided as in the illustration in figure 1 since the two cables start by sliding against each other with the result of reducing the length of the loop 40 located between the sleeves.
- FIG. 6B a tensile force due to the impact of a block is exerted on the carrying cable 14 in the direction of arrows.
- Fuse cable 30 has run against cable carrier in the sliding sleeve 32 (which dissipates a part of kinetic energy) until the stop sleeve 42 comes into abutment against the sliding sleeve 32.
- the length of the loop 40 between the sleeves was therefore scaled down.
- an interest in energy dissipation loops according to the invention is to mount them in parallel or in series of so that when each fusible cable breaks, the voltage exercises on the following until all the cables fuses of all the loops are broken.
- An example mounting of parallel loops is illustrated in figure 7 where all the loops are according to the embodiment of the Figure 5.
- the fuse cable 50 is stretched between the two locking sleeves 52 and 54.
- the fuse cable 50 breaks and the second fuse cable 56 breaks tends between the two locking sleeves 58 and 60.
- After break of the fuse cable 56 it is the turn of the fuse cable 62 to be stretched between the sleeves 64 and 66 and finally to the cable 68 between sleeves 70 and 72.
- the carrying cable 14 itself tends to its turn since there are no more unbroken fuse cables.
- the kinetic energy to be dissipated gradually weakens the rupture of successive fuse cables. That is why, it is possible to provide successive fuse cables of which the resistance force opposite to the traction force exerted on the carrying cable is decreasing. Normally, with optimal mounting, the resistance opposed by the last fuse cable should be relatively small as far where the kinetic energy to dissipate is low at this time.
- Load-bearing cables used in barriers rock fall arrest dynamics are generally metal cables, preferably steel, with a diameter generally between 10 and 25mm.
- Fuse cables are cables with a length for example between 0.5m and 1m and which can be the same diameter as the carrier cables.
- Fuse cables which must have a reduced elastic limit and a modulus of elasticity lower than that of carrier cables, can be metal, especially steel, but also a material plastic or composite with mechanical parameters equivalent to steel, fire and radiation resistant they are constantly exposed to.
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Devices Affording Protection Of Roads Or Walls For Sound Insulation (AREA)
- Revetment (AREA)
- Artificial Fish Reefs (AREA)
- Secondary Cells (AREA)
- Adornments (AREA)
Description
Claims (9)
- Boucle de dissipation d'énergie pour barrière dynamique d'arrêt de chutes de pierres, ladite barrière comportant un filet (10) disposé entre des poteaux (12) ancrés au sol et maintenus à l'aide de câbles porteurs (14) reliant les poteaux à des plaques d'appui (18) ancrées au sol, ladite boucle comportant un câble porteur et étant caractérisée en ce qu'elle comprend :un câble fusible (30) d'une longueur déterminée ayant, par rapport au câble porteur, une limite d'élasticité réduite et un module d'élasticité plus faible, ledit câble fusible comportant à chaque extrémité un moyen de blocage (32, 36, 42 et 46) reliant ensemble le câble fusible et le câble porteur de manière à ce qu'au repos la longueur du câble fusible située entre lesdits moyens de blocage soit sensiblement inférieure à la longueur du câble porteur située entre lesdits moyens de blocage, et chacun desdits moyens de blocage étant destiné à bloquer le câble fusible sur le câble porteur après que ledit câble porteur a été soumis à une force de traction due à une chute de pierres de sorte que ledit câble fusible subisse subséquemment une force de traction entraínant d'abord son allongement et ensuite sa rupture.
- Boucle de dissipation d'énergie selon la revendication 1, comprenant comme moyen de blocage à au moins une de ses deux extrémités un manchon coulissant (32) serrant ensemble ledit câble porteur (14) et ledit câble fusible (30) tout en leur permettant de coulisser entre eux, un manchon d'arrêt (36) fixé à l'extrémité dudit câble fusible et à l'extérieur de la boucle de dissipation d'énergie et un manchon d'arrêt (42) fixé sur ledit câble porteur à l'intérieur de ladite boucle, de telle sorte que, lorsque ledit câble porteur est soumis à une force de traction, ledit câble porteur coulisse sur ledit câble fusible jusqu'à ce que ledit manchon d'arrêt fixé sur ledit câble porteur vienne en butée sur ledit manchon coulissant, puis ledit câble porteur continue à coulisser sur ledit câble fusible jusqu'à ce que ledit manchon coulissant vienne en butée sur ledit manchon d'arrêt à l'extrémité dudit câble fusible et enfin que le câble fusible subisse un allongement sous l'effet de la force de traction qui lui est appliquée avant de provoquer sa rupture (Figure 6A à 6D).
- Boucle de dissipation d'énergie selon la revendication 1, comprenant comme moyen de blocage à au moins une de ses extrémités un manchon de blocage (46 ou 48) bloquant ensemble ledit câble porteur (14) et ledit câble fusible (30) de telle sorte que ledit câble fusible est soumis à une force de traction entraínant d'abord son allongement et enfin sa rupture dès que ledit câble porteur est soumis à une force de traction due à une chute de pierres.
- Boucle de dissipation d'énergie selon les revendications 2 et 3, comprenant d'un côté un moyen de blocage formé d'un manchon coulissant (32), d'un manchon d'arrêt (36) fixé à l'extrémité dudit câble fusible (30) et d'un manchon d'arrêt (42) fixé sur ledit câble porteur (14), et de l'autre côté un moyen de blocage (46) pour bloquer ensemble ledit câble porteur et ledit câble fusible.
- Boucle selon l'une des revendications 1 à 4, comprenant une pluralité de câbles fusibles (30) en parallèle entre lesdits moyens de blocage de différentes longueurs et/ou ayant différents modules d'élasticité, de manière à ce que lesdits câbles fusibles s'allongent et se rompent successivement lorsque la force de traction est appliquée audit câble porteur (14).
- Barrière dynamique d'arrêt de chutes de pierres comportant un filet (10) disposé entre des poteaux (12) destinés à être ancrés au sol et maintenus à l'aide de câbles porteurs (14); caractérisée en ce qu'elle comprend plusieurs boucles de dissipation d'énergie selon l'une des revendications 2 à 5.
- Barrière selon la revendication 6, dans laquelle lesdites boucles de dissipation d'énergie sont montées en série sur ledit câble porteur (14).
- Barrière selon la revendication 6, dans laquelle lesdites boucles de dissipation d'énergie sont montées en parallèle (Figure 7) sur ledit câble porteur (14).
- Barrière selon la revendication 6, comportant au moins un ensemble de boucles montées en parallèles (Figure 7) en combinaison avec plusieurs boucles montées en série.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9705880 | 1997-05-07 | ||
FR9705880A FR2763083B1 (fr) | 1997-05-07 | 1997-05-07 | Barriere dynamique d'arret de chutes de pierres a boucles de dissipation d'energie |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0877122A1 EP0877122A1 (fr) | 1998-11-11 |
EP0877122B1 true EP0877122B1 (fr) | 2003-04-09 |
Family
ID=9506854
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98480032A Expired - Lifetime EP0877122B1 (fr) | 1997-05-07 | 1998-05-07 | Boucle de dissipation d'énergie et barrière dynamique d'arrêt de chûtes de pierres comprenant de telles boucles de dissipation d'énergie |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0877122B1 (fr) |
AT (1) | ATE237035T1 (fr) |
DE (1) | DE69813073D1 (fr) |
FR (1) | FR2763083B1 (fr) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2022035508A1 (fr) * | 2020-08-10 | 2022-02-17 | R&B Leasing, Llc | Système et procédé d'atténuation des chutes de pierres |
US11391005B2 (en) | 2017-08-04 | 2022-07-19 | R&B Leasing, Llc | System and method for mitigating rockfalls |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6254063B1 (en) * | 1998-11-04 | 2001-07-03 | Safety By Design, Inc. | Energy absorbing breakaway steel guardrail post |
IT1316786B1 (it) * | 2000-02-25 | 2003-05-12 | Gianangelo Cargnel | Barriera paramassi con rete di contenimento a sacco vincolata ai cavidi sommita' e di base |
DE60030690T2 (de) | 2000-05-18 | 2007-09-20 | Tecnap S.A.R.L. | Stoss-absorbierende Vorrichtung |
EP1469130A1 (fr) * | 2003-04-14 | 2004-10-20 | AVT Anker + Vorspanntechnik AG | Elément de freinage |
FR2899251A1 (fr) * | 2006-03-31 | 2007-10-05 | Laurent Thomel | Dispositif de freinage d'un corps en mouvement |
CH701591B1 (de) * | 2007-10-18 | 2011-02-15 | Geobrugg Ag | Bremsvorrichtung. |
FR2936786B1 (fr) * | 2008-10-07 | 2012-01-27 | Peugeot Citroen Automobiles Sa | Dispositif de retenue d'objets empiles dans des zones de stockage. |
EP2711461B1 (fr) * | 2012-09-21 | 2016-06-08 | Trumer Schutzbauten GesmbH | Support d'une protection contre les chutes de pierres |
FR3045682B1 (fr) * | 2015-12-16 | 2019-07-12 | Technologie Alpine De Securite -Tas | Dispositif de retenue de materiaux |
CH713179A1 (de) * | 2016-11-29 | 2018-05-31 | Jakob Ag | Seilbremse. |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH610631A5 (en) * | 1975-09-08 | 1979-04-30 | Brugg Ag Kabelwerke | Mechanical connection which is loaded in tension, especially for shock absorption, having at least one wire cable and means for absorbing energy in the force transmission path |
FR2414586B1 (fr) * | 1978-01-16 | 1985-09-06 | Ind Entreprise | Barriere de protection et de securite, notamment contre les chutes de pierres |
IT1184798B (it) * | 1985-07-31 | 1987-10-28 | Gianangelo Cargnel | Struttura per parete paramassi elastica migliorata |
LU86268A1 (fr) | 1986-01-27 | 1988-01-20 | Oreal | Nouveaux ethers de polyglycerols et leur utilisation en cosmetique et en pharmacie |
CH676259A5 (fr) * | 1988-10-12 | 1990-12-28 | Isofer Ag | |
US5435524A (en) * | 1993-12-06 | 1995-07-25 | Ingram; L. Howard | Impact fence |
-
1997
- 1997-05-07 FR FR9705880A patent/FR2763083B1/fr not_active Expired - Fee Related
-
1998
- 1998-05-07 DE DE69813073T patent/DE69813073D1/de not_active Expired - Lifetime
- 1998-05-07 EP EP98480032A patent/EP0877122B1/fr not_active Expired - Lifetime
- 1998-05-07 AT AT98480032T patent/ATE237035T1/de not_active IP Right Cessation
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11391005B2 (en) | 2017-08-04 | 2022-07-19 | R&B Leasing, Llc | System and method for mitigating rockfalls |
WO2022035508A1 (fr) * | 2020-08-10 | 2022-02-17 | R&B Leasing, Llc | Système et procédé d'atténuation des chutes de pierres |
Also Published As
Publication number | Publication date |
---|---|
FR2763083B1 (fr) | 1999-07-02 |
DE69813073D1 (de) | 2003-05-15 |
ATE237035T1 (de) | 2003-04-15 |
EP0877122A1 (fr) | 1998-11-11 |
FR2763083A1 (fr) | 1998-11-13 |
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