EP3631093A1 - Impact absorbing device for dynamic barriers against rockfalls - Google Patents

Impact absorbing device for dynamic barriers against rockfalls

Info

Publication number
EP3631093A1
EP3631093A1 EP18725793.6A EP18725793A EP3631093A1 EP 3631093 A1 EP3631093 A1 EP 3631093A1 EP 18725793 A EP18725793 A EP 18725793A EP 3631093 A1 EP3631093 A1 EP 3631093A1
Authority
EP
European Patent Office
Prior art keywords
rope
tube
impact absorbing
absorbing device
hole
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.)
Granted
Application number
EP18725793.6A
Other languages
German (de)
French (fr)
Other versions
EP3631093B1 (en
Inventor
Daniel Castro Fresno
Elena BLANCO FERNANDEZ
Laura CASTANON - JANO
Alejandro ALONSO - ESTEBANEZ
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.)
Bekaert NV SA
Original Assignee
Bekaert NV 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.)
Filing date
Publication date
Application filed by Bekaert NV SA filed Critical Bekaert NV SA
Publication of EP3631093A1 publication Critical patent/EP3631093A1/en
Application granted granted Critical
Publication of EP3631093B1 publication Critical patent/EP3631093B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • 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

Definitions

  • the invention relates to an impact absorbing device and to a slope
  • Impact absorbing devices must first assure continuity of the screen or fence and thus prevent the screen or fence to be broken in two or more parts.
  • impact absorbing devices must be able to absorb various levels of energy, since it is not known in advance how big the impact may be.
  • a third requirement is that the impact absorbing devices must be resistant to severe weather conditions. They should be resistant to corrosion, continue working under humid conditions or under varying temperatures.
  • a last and fourth requirement is that the impact absorbing devices must have a long life time since they are in general installed and used on locations that are not easy to reach.
  • Patent application KR-A-20150031259 discloses an impact absorbing mechanism where a rope is encircling a tube. Upon impact the released energy is transformed into deformation energy of the tube and in heat due to friction between the rope and the tube. The deformation of the tube is only locally in the region of the encircling rope.
  • Patent applications KR-A-20120083874 and KR-A-201 10130077 disclose a rockfall protection fence. Upon impact the tension on the rope is transferred to a device with a tube shaped part that can deform to absorb the transferred impact energy. This impact absorbing device needs to be located on a post.
  • Patent application US-A-2010 0327244 discloses another rockfall
  • Rope members go through posts in opposite directions and energy absorbers are provided to hold the ends of the ropes in place.
  • Absorbers included in this patent are friction-resistant type. When tensile force overcomes their friction resistance, ropes slide through the absorber Posts does not deform, but act as a lock.
  • Yet another object of the invention to provide an impact absorbing device that can be installed at various locations in a dynamic barrier against rockfalls.
  • an impact absorbing device with at least one tube.
  • This tube or these tubes have a wall that is provided with two holes at a first side and two holes at a second side.
  • the device further comprises a first rope and a second rope.
  • the first rope passes through the tube or tubes starting from a first hole at the first side and going to a first hole at the second side of a first tube, and so on until all tubes have been passed through.
  • the first rope is provided at its one end with a first thickening element such as a sleeve that prevents the first rope from slipping back or being pulled back through the tube or tubes.
  • the first thickening element is fixed to the first rope and unable to slide along the first rope.
  • the second rope passes through the tube or tubes starting from a second hole at the second side and going to a second hole at the first side of a first tube and so on until all tubes have been passed through.
  • the second rope is provided at its one end with a second thickening element such as a sleeve that prevents the second rope from slipping back or being pulled back through the tube or tubes.
  • the second thickening element is fixed to the second rope and unable to slide along the second rope.
  • this impact absorbing device allows to transform impact energy into energy needed to deform the tube or tubes, into energy needed to plastically elongate both ropes and into heat energy caused by friction of the ropes in the holes and with the stiff elements.
  • the tubes are preferably made of steel, aluminium or of another metallic alloy with a high level of deformation potential. These tubes or any of the rest of the parts can be made of neoprene, gum or other plastic material with similar properties. By selecting the proper tube material, by determining the number of tubes (one, two, three or more) and by designing the thickness of the tubes, one may obtain a large range of impact energy that can be absorbed.
  • first rope and the second rope are
  • the first hole at the first side is positioned diametrically vis-a-vis the first hole at the second side.
  • the second hole at the first side is positioned preferably diametrically vis-a-vis the second hole at the second side.
  • the tube or tubes may have a circular cross-section, a rectangular cross- section or a rhombic cross-section.
  • the tubes do not have irregularities in the material that may cause weakening of the tubes and decrease in the deformation energy. More particularly, the tubes do not have welds.
  • the thickening element at the end of the ropes may work together in combination with a stiff element.
  • Stiff elements e.g. stiff plates, are positioned between the first and/or the second thickenings and the at least one tube.
  • the thickening at the rope end and the stiff element must work together such that after complete compression of the tube or tubes, the ropes still do not slip back through the tubes. The ropes must be blocked so that ultimately plastic elongation of the ropes can occur until fracture of the ropes. Fracture of the thickened rope ends is to be avoided.
  • the first and/or said second thickenings transmit a compression force to the at least one tube and transform the impact energy into energy needed to deform the at least one tube by compression.
  • the impact energy can also be partially transformed into energy needed to plastically elongate the ropes and into heat energy caused by friction of the ropes in the holes and with the possible stiff elements.
  • a slope protection system as a dynamic barrier against rockfalls that comprises an impact absorbing device according to the first aspect of the invention.
  • the impact absorbing devices can be also used for mudflow barriers, debris barriers or snow barriers as different dynamic barriers for several applications.
  • the dynamic barrier may have several posts and nets, screens or fences positioned and installed between the posts at the dynamic barrier.
  • Perimeter ropes are hanging the nets, screens or fences to the posts. Supporting ropes are connecting the posts to anchors in the ground.
  • the impact absorbing device may be positioned on one or more of the perimeter ropes, or on one or more of the supporting ropes or on both types of ropes, thus giving flexibility to locate the impact absorbing device at the positions where the needs may be the highest.
  • Figure 1 is a perspective view of an impact absorbing device according to the invention.
  • Figure 2 is a perspective view of a tube used in an impact absorbing
  • Figure 3 is a perspective view of a preferable embodiment of the impact absorbing device according to the invention.
  • Figure 4 is a schematic view of a dynamic barrier equipped with several impact absorbing devices according to the invention. Mode(s) for Carrying Out the Invention
  • Figure 1 is a perspective view of an impact absorbing device 100
  • the device 100 has one tube 102.
  • This tube 102 has a first hole 104 and a second hole 106 at a first side and a first hole 108 and a second hole 1 10 at a second side.
  • a first rope 1 12 passes through the first hole 104 at the first side and through the first hole 108 at the second side. Further on, the first rope also passes through a solid stiff block 1 14.
  • the first rope 1 12 is provided with a sleeve 1 16. The sleeve 1 16 transmits the force exercised on the first rope 1 12 to the solid stiff block 1 14.
  • the stiff block 1 14 prevents the first rope 1 12 from slipping back.
  • a second rope 1 18 passes through a hole in the stiff block 1 14 at the second side, through a second hole 1 10 at the second side, through a second hole 106 at the first side, and finally through a hole of a stiff block 120 at the first side.
  • the second rope 1 18 ends with a sleeve 122.
  • FIG. 2 is a perspective view of a further improvement of a tube 200 used in an impact absorbing device according to a first aspect of the invention.
  • the tube 200 has a first hole 202 and a second hole 204 at a first side and a first hole 206 and a second hole 208 at a second side.
  • Hole 202 is positioned diametrically vis-a-vis hole 206.
  • hole 204 is positioned diametrically vis-a-vis hole 208.
  • the presence of the holes 202, 204, 206, 208 may weaken section A-A in the tube 200 to such an extent that deformation starts only in section A-A.
  • the energy absorbable by the tube could be doubled by increasing somewhat the diameter D and the thickness T.
  • FIG 3 is a perspective view of a preferable embodiment of an impact absorbing device 300 according to a first aspect of the invention.
  • the impact absorbing device 300 has two tubes 302 and 304.
  • a first rope 306 passes through the two tubes 302, 304 and comprises a sleeve 308 at its one end at one side.
  • This sleeve 308 has an external diameter that is larger than the hole through a stiff, solid plate 310 where the first rope 306 passes through.
  • a second rope 312 passes through the tubes 302, 304 and ends with a sleeve 314 in contact with a stiff solid plate 316 at the other side.
  • Test speed was set at the value that is recommended by the ETAG for static tests on energy dissipators. .
  • the outer diameter D of the two tubes and the thickness T of the tubes determined The displacement of the tubes, the displacement of the ropes and the displacement of the clamps in the test that were all recorded
  • this third part can be derived by subtracting the first part and the second part from the total energy .
  • Figure 4 is a schematic view of how impact absorbing devices according to the first aspect of the invention are used and integrated into a dynamic barrier against rockfalls 400.
  • a dynamic barrier against rockfalls 400 comprises a number of poles 402, 404, 406 between which fences, nets or screens 408, 410 are hung.
  • These fences 408, 410 may preferably be chain link fences.
  • the fences 408, 410 are stretched and attached to the poles 402, 404, 406 with the help of perimeter ropes 412, 414, 416 and 418.
  • supporting ropes 420, 422 attach the left most pole 402 to a support or anchor 424.
  • supporting ropes 426, 428 connect the right most pole 406 to a support or anchor 430.
  • the poles in-between may also be connected or attached to a support. Since the invention impact absorbing devices do not need to be connected to a post, there is quite some freedom to position them in the dynamic barrier against rockfalls 400.
  • Impact absorbing devices 434, 436 may be positioned on the upper perimeter ropes 412 and 414.
  • impact absorbing devices , 438 may be positioned on the supporting ropes 420, 428.

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Devices Affording Protection Of Roads Or Walls For Sound Insulation (AREA)
  • Fluid-Damping Devices (AREA)

Abstract

An impact absorbing device (100) comprises at least one tube (102). This tube (102) has a wall that is provided with two holes (104, 106) at a first side and two holes (108, 110) at a second side. The device further comprises a first rope (112) and a second rope (118). The first rope (112) passes through the tube (102) or tubes starting from a first hole (104) at the first side and going to a first hole (108) at the second side. This first rope (112) is provided at its one end with a thickening (116) that prevents the first rope (112) from slipping back through the tube (102) or tubes. The second rope (118) passes through the tube (102) or tubes starting from a second hole (110) at the second side and going to a second hole (106) at the first side. The second rope (118) is provided at its one end with a thickening (122) that prevents the second rope (118) from slipping back through the tube (102) or tubes.

Description

IMPACT ABSORBING DEVICE FOR DYNAMIC BARRIERS AGAINST
ROCKFALLS
Description
Technical Field
[0001 ] The invention relates to an impact absorbing device and to a slope
protection system with such an impact absorbing device in a dynamic barrier against rockfalls.
Background Art
[0002] Dynamic barriers against rockfalls are in general not designed to absorb high energies caused by e.g. large rocks falling. Therefore, energy absorbing devices are added to the screen or fence system. Kinetic and potential energy released by rockfall must be transformed in deformation, fracture, or heat caused by friction of elements of the impact absorbing devices.
[0003] Efficient impact absorbing devices must meet high demands.
[0004] Impact absorbing devices must first assure continuity of the screen or fence and thus prevent the screen or fence to be broken in two or more parts.
[0005] Secondly, impact absorbing devices must be able to absorb various levels of energy, since it is not known in advance how big the impact may be.
[0006] A third requirement is that the impact absorbing devices must be resistant to severe weather conditions. They should be resistant to corrosion, continue working under humid conditions or under varying temperatures.
[0007] A last and fourth requirement is that the impact absorbing devices must have a long life time since they are in general installed and used on locations that are not easy to reach.
[0008] Patent application KR-A-20150031259 discloses an impact absorbing mechanism where a rope is encircling a tube. Upon impact the released energy is transformed into deformation energy of the tube and in heat due to friction between the rope and the tube. The deformation of the tube is only locally in the region of the encircling rope.
[0009] Patent applications KR-A-20120083874 and KR-A-201 10130077 disclose a rockfall protection fence. Upon impact the tension on the rope is transferred to a device with a tube shaped part that can deform to absorb the transferred impact energy. This impact absorbing device needs to be located on a post.
[0010] Patent application US-A-2010 0327244 discloses another rockfall
protection fence. Rope members go through posts in opposite directions and energy absorbers are provided to hold the ends of the ropes in place. Absorbers included in this patent are friction-resistant type. When tensile force overcomes their friction resistance, ropes slide through the absorber Posts does not deform, but act as a lock.
Disclosure of Invention
[001 1 ] It is a general object of the invention to avoid the drawbacks of the prior art.
[0012] It is a particular object of the invention to provide an impact absorbing device that has various composing elements that can be designed either in number or in dimensions or in both to allow for absorption of different levels of impact energy.
[0013] It is another object of the invention to provide an impact absorbing device that allows transforming the impact energy in deformation energy and in heat energy caused by friction.
[0014] Yet another object of the invention to provide an impact absorbing device that can be installed at various locations in a dynamic barrier against rockfalls.
[0015] According to a first aspect of the invention, there is provided an impact absorbing device with at least one tube. This tube or these tubes have a wall that is provided with two holes at a first side and two holes at a second side.
The device further comprises a first rope and a second rope. The first rope passes through the tube or tubes starting from a first hole at the first side and going to a first hole at the second side of a first tube, and so on until all tubes have been passed through. The first rope is provided at its one end with a first thickening element such as a sleeve that prevents the first rope from slipping back or being pulled back through the tube or tubes. The first thickening element is fixed to the first rope and unable to slide along the first rope.
The second rope passes through the tube or tubes starting from a second hole at the second side and going to a second hole at the first side of a first tube and so on until all tubes have been passed through. The second rope is provided at its one end with a second thickening element such as a sleeve that prevents the second rope from slipping back or being pulled back through the tube or tubes. The second thickening element is fixed to the second rope and unable to slide along the second rope.
[0016] As will be explained hereinafter, this impact absorbing device allows to transform impact energy into energy needed to deform the tube or tubes, into energy needed to plastically elongate both ropes and into heat energy caused by friction of the ropes in the holes and with the stiff elements.
[0017] The tubes are preferably made of steel, aluminium or of another metallic alloy with a high level of deformation potential. These tubes or any of the rest of the parts can be made of neoprene, gum or other plastic material with similar properties. By selecting the proper tube material, by determining the number of tubes (one, two, three or more) and by designing the thickness of the tubes, one may obtain a large range of impact energy that can be absorbed.
[0018] In a preferable embodiment the first rope and the second rope are
arranged substantially parallel to each other.
[0019] Most preferably, the first hole at the first side is positioned diametrically vis-a-vis the first hole at the second side. Similarly, the second hole at the first side is positioned preferably diametrically vis-a-vis the second hole at the second side. The above design, namely parallel ropes and diametrically opposed holes, aims at obtaining the maximum possible deformation energy from the tubes.
[0020] The tube or tubes may have a circular cross-section, a rectangular cross- section or a rhombic cross-section.
[0021 ] Preferably the tubes do not have irregularities in the material that may cause weakening of the tubes and decrease in the deformation energy. More particularly, the tubes do not have welds.
[0022] The thickening element at the end of the ropes, e.g. a sleeve, a weld or a sling, may work together in combination with a stiff element. Stiff elements, e.g. stiff plates, are positioned between the first and/or the second thickenings and the at least one tube. The thickening at the rope end and the stiff element must work together such that after complete compression of the tube or tubes, the ropes still do not slip back through the tubes. The ropes must be blocked so that ultimately plastic elongation of the ropes can occur until fracture of the ropes. Fracture of the thickened rope ends is to be avoided. When an impact energy causes a tension force on the first and/or second rope, the first and/or said second thickenings transmit a compression force to the at least one tube and transform the impact energy into energy needed to deform the at least one tube by compression. The impact energy can also be partially transformed into energy needed to plastically elongate the ropes and into heat energy caused by friction of the ropes in the holes and with the possible stiff elements.
[0023] Generally, absorbing devices acting by friction are not regular in their
behavior. Two devices with the same geometry and absorbing mechanism can have very different activation forces as well as different shape of the Force-displacement curve. This is related with the inaccuracy of (or difficulty on applying the same) the bolt pressure or small differences on the surface roughness. Energy absorbers acting by buckling have a more regular behavior all along their characteristic curve, excepting the activation energy that could also vary for the same tube profile. On the contrary and as an advantage of the present invention, the present invention does not have these problems. Experimental tests have been carried out with the same geometry according to the present invention, and Force-Displacement curves obtained are identical one to each other.
[0024] According to a second aspect of the invention, there is provided a slope protection system as a dynamic barrier against rockfalls that comprises an impact absorbing device according to the first aspect of the invention. The impact absorbing devices can be also used for mudflow barriers, debris barriers or snow barriers as different dynamic barriers for several applications.
[0025] The dynamic barrier may have several posts and nets, screens or fences positioned and installed between the posts at the dynamic barrier.
Perimeter ropes are hanging the nets, screens or fences to the posts. Supporting ropes are connecting the posts to anchors in the ground. The impact absorbing device may be positioned on one or more of the perimeter ropes, or on one or more of the supporting ropes or on both types of ropes, thus giving flexibility to locate the impact absorbing device at the positions where the needs may be the highest.
Brief Description of Figures in the Drawings
[0026] Figure 1 is a perspective view of an impact absorbing device according to the invention;
[0027] Figure 2 is a perspective view of a tube used in an impact absorbing
device according to the invention;
[0028] Figure 3 is a perspective view of a preferable embodiment of the impact absorbing device according to the invention;
[0029] Figure 4 is a schematic view of a dynamic barrier equipped with several impact absorbing devices according to the invention. Mode(s) for Carrying Out the Invention
[0030] Figure 1 is a perspective view of an impact absorbing device 100
according to the first aspect of the invention. The device 100 has one tube 102. This tube 102 has a first hole 104 and a second hole 106 at a first side and a first hole 108 and a second hole 1 10 at a second side. A first rope 1 12 passes through the first hole 104 at the first side and through the first hole 108 at the second side. Further on, the first rope also passes through a solid stiff block 1 14. At its end, the first rope 1 12 is provided with a sleeve 1 16. The sleeve 1 16 transmits the force exercised on the first rope 1 12 to the solid stiff block 1 14. Due to the fact that the sleeve 1 16 has a larger diameter than the diameter in the hole of the solid stiff block 1 14, the stiff block 1 14 prevents the first rope 1 12 from slipping back. In the same way as the first rope 1 12, a second rope 1 18 passes through a hole in the stiff block 1 14 at the second side, through a second hole 1 10 at the second side, through a second hole 106 at the first side, and finally through a hole of a stiff block 120 at the first side. The second rope 1 18 ends with a sleeve 122.
[0031 ] Upon impact on a screen or fence that is attached to the impact absorbing device 100, the forces on the screen or fence will be translated in pulling forces on the first rope 1 12 and the second rope 1 18. The sleeves 1 14 and 140 will transform these pulling forces on the ropes 1 12, 1 18 into compressive forces on the stiff blocks 1 14, 120. As these stiff blocks 1 14, 120 are not immediately deformable, the tube 102 will start to deform plastically and absorb at least part of the impact energy. Simultaneously heat is generated between the ropes 1 12, 1 18 and the stiff blocks 1 14, 120 and between the ropes 1 12, 1 18 and the tube 102. Depending upon the amount of impact energy, the ropes 1 12, 1 18 may start to deform plastically and absorb also part of the impact energy.
[0032] Figure 2 is a perspective view of a further improvement of a tube 200 used in an impact absorbing device according to a first aspect of the invention. The tube 200 has a first hole 202 and a second hole 204 at a first side and a first hole 206 and a second hole 208 at a second side. Hole 202 is positioned diametrically vis-a-vis hole 206. Similarly, hole 204 is positioned diametrically vis-a-vis hole 208. The presence of the holes 202, 204, 206, 208 may weaken section A-A in the tube 200 to such an extent that deformation starts only in section A-A.
[0033] By selection of the proper material for the tube, by designing the outer diameter D and the thickness T, various levels of impact energy can be absorbed.
For a particular tube material, the energy absorbable by the tube could be doubled by increasing somewhat the diameter D and the thickness T.
[0034] Not only the dimensions of the tube may be varied, but also the number of tubes.
[0035] Figure 3 is a perspective view of a preferable embodiment of an impact absorbing device 300 according to a first aspect of the invention. The impact absorbing device 300 has two tubes 302 and 304. A first rope 306 passes through the two tubes 302, 304 and comprises a sleeve 308 at its one end at one side. This sleeve 308 has an external diameter that is larger than the hole through a stiff, solid plate 310 where the first rope 306 passes through. Similarly a second rope 312 passes through the tubes 302, 304 and ends with a sleeve 314 in contact with a stiff solid plate 316 at the other side.
[0036] Static tensile tests have been carried out separately on the ropes in order to measure the possible energy that can be absorbed by the ropes. This is done by recording a load displacement curve and by measuring the area under the curve.
Static compression tests have been carried out separately on the tubes in order to measure the energy that can be absorbed by the tubes
themselves.
[0037] Finally some static tensile tests have been carried out on an impact
absorbing device as shown in Figure 3. Test speed was set at the value that is recommended by the ETAG for static tests on energy dissipators. . The outer diameter D of the two tubes and the thickness T of the tubes determined The displacement of the tubes, the displacement of the ropes and the displacement of the clamps in the test that were all recorded
The static tensile tests carried out on the impact absorbing device gives a good estimate of the total energy absorbable. This total energy can be divided into three components:
- a first part absorbed by the plastic deformation of the tubes, this first part is determined by the static compression tests on the tubes individually;
- a second part absorbed by the plastic deformation of the ropes, this second part is determined by the tensile tests carried separately on the ropes;
- a third part absorbed friction between the ropes and the holes, mainly the holes of the stiff plates, this third part can be derived by subtracting the first part and the second part from the total energy .
[0038] Figure 4 is a schematic view of how impact absorbing devices according to the first aspect of the invention are used and integrated into a dynamic barrier against rockfalls 400.
[0039] A dynamic barrier against rockfalls 400 comprises a number of poles 402, 404, 406 between which fences, nets or screens 408, 410 are hung.
These fences 408, 410 may preferably be chain link fences. The fences 408, 410 are stretched and attached to the poles 402, 404, 406 with the help of perimeter ropes 412, 414, 416 and 418. At the left side, supporting ropes 420, 422 attach the left most pole 402 to a support or anchor 424. At the left side, supporting ropes 426, 428 connect the right most pole 406 to a support or anchor 430. The poles in-between may also be connected or attached to a support. Since the invention impact absorbing devices do not need to be connected to a post, there is quite some freedom to position them in the dynamic barrier against rockfalls 400. Impact absorbing devices 434, 436 may be positioned on the upper perimeter ropes 412 and 414. Alternatively or additionally, impact absorbing devices , 438 may be positioned on the supporting ropes 420, 428. of Reference Numbers
first embodiment of an impact absorbing device tube
first hole at first side
second hole at first side
first hole at second side
second hole at second side
first rope
first stiff cylindrical element
sleeve for first rope
second rope
second stiff cylindrical element sleeve for second rope
tube
first hole at first side
second hole at first side
first hole at second side
second hole at second side second embodiment of impact absorbing device first tube
second tube
first rope
sleeve for first rope
first stiff plate
second rope
sleeve for second rope
second stiff plate
dynamic barrier against rockfalls- 404 -406 pole
- 410 fence -414-416 418 perimeter rope
- 422 supporting rope
support
-428 supporting rope
support
- 434 - 436 438 energy absorbing device

Claims

Claims
1 . An impact absorbing device,
said device comprising at least one tube,
said at least one tube having a wall that is provided with two holes at a first side and two holes at a second side,
said device further comprising a first rope and a second rope,
said first rope passing through said at least one
tube starting from a first hole at the first side and going to a first hole at the second side,
said first rope being provided at its one end with a first thickening that prevents said first rope from slipping back through said at least one tube,
said first thickening element being fixed to said first rope and unable to slide along said first rope,
said second rope passing through said at least one tube starting from a second hole at the second side and going to a second hole at the first side, said second rope being provided at its one end with a second thickening that prevents said second rope from slipping back through said at least one tube
said second thickening element being fixed to said second rope and unable to slide along said second rope.
2. An impact absorbing device according to claim 1 ,
wherein said first rope and said second rope are substantially parallel to each other.
3. An impact absorbing device according to claim 2,
wherein the first hole at the first side is positioned diametrically versus the first hole at the second side and wherein the second hole at the first side is positioned diametrically versus the second hole at the second side.
4. An impact absorbing device according to any one of the preceding claims, said device comprising two or more tubes.
5. An impact absorbing device according to any one or the preceding claims, wherein said at least one tube has a circular cross-section.
6. An impact absorbing device according to any one of claims 1 to 4,
wherein said at least one tube has a rectangular cross-section.
7. An impact absorbing device according to any one of the preceding claims, wherein said tube has no welds.
8. An impact absorbing device according to any one of the preceding claims, wherein stiff plates are positioned between said first and/or second thickenings and said at least one tube.
9. An impact absorbing device according to any of claims 1 to 8, when an impact energy causes a tension force on said first or second rope, said first and/or second thickenings transmit a compression force to said at least one tube and transform the impact energy into energy needed to deform said at least one tube by compression.
10. A dynamic barrier against rockfalls comprising an impact absorbing device according to any one of the preceding claims.
1 1 .A dynamic barrier against rockfalls according to claim 10,
said dynamic barrier comprising:
- posts,
- nets positioned between said posts,
- perimeter ropes hanging said nets between said posts,
- supporting ropes connecting said posts to the anchors in the ground, at least one impact absorbing device being positioned one said perimeter ropes or on said supporting ropes.
EP18725793.6A 2017-05-24 2018-05-09 Dynamic barrier against rockfalls with an impact absorbing device Active EP3631093B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP17172793 2017-05-24
PCT/EP2018/062102 WO2018215216A1 (en) 2017-05-24 2018-05-09 Impact absorbing device for dynamic barriers against rockfalls

Publications (2)

Publication Number Publication Date
EP3631093A1 true EP3631093A1 (en) 2020-04-08
EP3631093B1 EP3631093B1 (en) 2022-12-14

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Country Status (7)

Country Link
EP (1) EP3631093B1 (en)
CL (1) CL2019003092A1 (en)
ES (1) ES2939666T3 (en)
PE (1) PE20210055A1 (en)
PL (1) PL3631093T3 (en)
PT (1) PT3631093T (en)
WO (1) WO2018215216A1 (en)

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US10738424B2 (en) * 2017-08-04 2020-08-11 R&B Leasing, Llc System and method for mitigating rockfalls
US11391005B2 (en) 2017-08-04 2022-07-19 R&B Leasing, Llc System and method for mitigating rockfalls
WO2022035508A1 (en) * 2020-08-10 2022-02-17 R&B Leasing, Llc System and method for mitigating rockfalls
JP7601328B2 (en) * 2020-12-15 2024-12-17 シバタ工業株式会社 Protective material for the drift catcher
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PL3631093T3 (en) 2023-04-03
PE20210055A1 (en) 2021-01-11
PT3631093T (en) 2023-02-21
CL2019003092A1 (en) 2020-02-21
ES2939666T3 (en) 2023-04-25
WO2018215216A1 (en) 2018-11-29

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