JP2020020253A - Shock absorbing wire and rock fall prevention system - Google Patents

Abstract

To provide a shock absorbing wire that absorbs a shock by breaking a wire fixing portion only when a shock larger than a predetermined threshold is applied, and a rock fall prevention system using such a shock absorbing wire.SOLUTION: A shock absorbing wire 10, 20, 30, 40 for absorbing shocks includes a wire body 12, 22, 32, and 42, and a wire fixing portion 13, 24, 34, and 44 that fixes the wire body 12, 22, 32, 42 in a curved state. Then, when the magnitude of a shock applied to the shock absorbing wire 10, 20, 30, 40 is larger than a predetermined threshold, the wire fixing portion 13, 24, 34, 44 is broken so as to absorb the shock applied to the shock absorbing wire 10, 20, 30, 40.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a shock absorbing wire for absorbing a shock, and a rock fall prevention system installed on a mountain slope or the like using such a shock absorbing wire.

  2. Description of the Related Art Conventionally, in a rock fall protection fence installed on a slope of a mountain or the like for capturing rock fall, a shock when a rock fall is received by the rock fall protection fence is absorbed by a shock absorbing wire. More specifically, as a rock fall protection fence using such a shock absorbing wire, one disclosed in FIG. 1 of Patent Document 1 and the like is known.

  The fall protection fence disclosed in FIG. 1 of Patent Literature 1 includes a column disposed on a slope at a predetermined interval, a mountain-side wire stretched between an upper end of the column and a mountain-side slope, It has a ring-type net and the like for catching falling rocks set in between. Also, by allowing deformation (elongation) of the mountain-side wire or the like when rockfall is received by the ring-type net, a part of the impact applied to the mountain-side wire or the like due to the extension of the mountain-side wire is absorbed. Has become. More specifically, an annular portion is formed by making a single turn so that a part of the mountain side wire overlaps in the radial direction, and the annular portion is fixed by caulking a tightening member disposed in the overlapped portion. It has become. And when an impact is applied, the size of the ring of the annular portion is reduced, so that a part of the impact when catching a rock fall is absorbed by the frictional force acting between the mountain side wire and the tightening member. It has become so.

Japanese Patent No. 5979822

  However, the conventional shock absorbing wire as disclosed in Patent Document 1 absorbs the shock applied to the wire by allowing the wire to elongate. The wire extends even when it is small. As described above, there is a problem that the wire needs to be maintained at relatively short intervals because the wire is easily stretched even with a small impact.

  The present invention has been made in view of such a point, and a shock absorbing wire capable of absorbing a shock by breaking a wire fixing portion only when a shock greater than a predetermined threshold is applied. And a rock fall prevention system using such a shock absorbing wire.

  The shock absorbing wire of the present invention is a shock absorbing wire for absorbing a shock, and has a wire main body and a wire fixing portion for fixing the wire main body in a curved state. When the magnitude of the impact applied to the wire is larger than a predetermined threshold, the wire fixing portion is broken.

  According to such a shock absorbing wire, the wire main body is deformed from the curved state by breaking the wire fixing portion only when an impact larger than a predetermined threshold is applied. Can be made to absorb an impact when it breaks.

  In the shock absorbing wire according to the present invention, the wire fixing portion may include a curved support portion disposed inside the wire main body in a curved state.

  In this case, the wire fixing portion may further include a maintaining portion for maintaining the curved state of the wire main body so that the support portion does not come off from the wire main body.

  In the shock absorbing wire according to the present invention, the maintenance portion may be broken when the magnitude of the shock applied to the shock absorbing wire is larger than a predetermined threshold.

  In addition, as the wire fixing portion, a plurality of types having different thresholds of the magnitude of the shock at which the wire fixing portion breaks when an impact is applied to the shock absorbing wire are used so as to be arranged in series. It may be.

  Rockfall prevention system of the present invention, a plurality of pillars disposed on a slope at a predetermined interval, a falling object receiving member that is stretched on each of the pillars and receives a falling object falling along the slope, It has a wire main body stretched between the support and the slope on the mountain side, and a wire fixing portion for fixing the wire main body in a curved state, and a falling object is received by the falling object receiving member. And a shock absorbing wire that breaks when the magnitude of an impact given when the wire fixing portion is larger than a predetermined threshold value.

  According to such a rock fall prevention system, the shock absorbing wire that absorbs the shock by deforming the wire main body from the curved state by breaking the wire fixing portion only when an impact greater than the predetermined threshold is applied is used. This can reduce maintenance work.

  According to the shock absorbing wire and the rock fall prevention system of the present invention, the shock applied to the shock absorbing wire is absorbed by making the wire fixing portion break only when an impact larger than a predetermined threshold is applied. can do.

It is a lineblock diagram showing the composition of the shock absorption wire by an embodiment of the invention. FIG. 2 is a perspective view illustrating a configuration of a support portion in a wire fixing portion of the shock absorbing wire illustrated in FIG. 1. FIG. 2 is a perspective view illustrating a configuration of a maintenance portion of a wire fixing portion of the shock absorbing wire illustrated in FIG. 1. It is a perspective view showing composition of a shock absorption wire by a conventional technology. It is a block diagram which shows the structure of the other example of the shock absorption wire by embodiment of this invention. FIG. 9 is a configuration diagram showing still another configuration of the shock absorbing wire according to the embodiment of the present invention. FIG. 9 is a configuration diagram showing still another configuration of the shock absorbing wire according to the embodiment of the present invention. FIG. 9 is a configuration diagram showing still another configuration of the shock absorbing wire according to the embodiment of the present invention. It is a perspective view which shows roughly the structure of the rock fall prevention system using the shock absorption wire shown in FIG. It is a side view which shows roughly the structure of the rock fall prevention system shown in FIG. It is a side view which shows the structure of the modification of the shock absorption wire by embodiment of this invention. FIG. 12 is a front view illustrating a configuration of a wire fixing portion and a spring in the shock absorbing wire illustrated in FIG. 11. FIG. 13 is an explanatory diagram illustrating an operation when a shock is absorbed by the shock absorbing wires illustrated in FIGS. 11 and 12. It is a side view showing composition of other modifications of a shock absorption wire by an embodiment of the invention. It is a side view which shows the structure of the further another modification of the shock absorbing wire by embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 to FIG. 10 are views for explaining a shock absorbing wire and a rock fall prevention system according to the present embodiment. 1 is a configuration diagram showing the configuration of the shock absorbing wire according to the present embodiment, and FIGS. 2 and 3 are a supporting portion and a maintaining portion in the wire fixing portion of the shock absorbing wire shown in FIG. 1, respectively. It is a perspective view which shows a structure of. FIG. 4 is a perspective view showing a configuration of a conventional shock absorbing wire, and FIGS. 5 to 8 are configuration diagrams showing other examples of the configuration of the shock absorbing wire according to the embodiment of the present invention. It is. FIG. 9 is a perspective view schematically showing the configuration of the rock fall prevention system using the shock absorbing wire shown in FIG. 1, and FIG. 10 is a side view schematically showing the configuration of the rock fall prevention system shown in FIG. FIG.

  As shown in FIG. 1, the shock absorbing wire 10 of the present embodiment has a wire main body 12 and a wire fixing portion 14 for fixing the wire main body 12 in a curved state. When the applied shock is larger than a predetermined threshold, the wire fixing portion 14 breaks to absorb the shock. FIG. 1 shows an embodiment in which one shock absorbing wire 10 is provided with one wire fixing portion 14, but in practice, one shock absorbing wire 10 is provided with a plurality of wire fixing portions 14. Are provided in series (see FIG. 9).

  Further, the wire fixing portion 14 is provided with a disk-shaped support portion 15 disposed inside the wire main body 12 in a curved state, and for maintaining the wire main body 12 in a curved state so that the support portion 15 does not come off from the wire main body 12. And a portion 16. Further, the supporting portion 15 and the maintaining portion 16 are connected by a connecting member 17 such as a string, so that the relative positional relationship between the supporting portion 15 and the maintaining portion 16 is fixed by the connecting member 17. Has become. Further, after the wire main body 12 is bent in a substantially U-shape and the bent state is supported by the support portion 15, both ends in the substantially U-shape are fixed by the maintenance portion 16, This maintains the curved shape as shown in FIG. More specifically, as shown in FIG. 3, the holding portion 16 is formed of an elongated plate-shaped member provided with two through holes 16a, and these through holes 16a are provided with substantially U-shaped curved wire bodies 12. Both ends of the shape are passed through. Therefore, even if the curved shape of the wire main body 12 is to be deformed when an impact smaller than a predetermined threshold described later is applied to the shock absorbing wire 10, the deformation of the wire main body 12 is restricted by the support portion 15 and the maintaining portion 16. It is supposed to be.

  In addition, the retaining portion 16 is configured to break when the impact applied to the impact absorbing wire 10 is greater than a predetermined threshold value and to absorb the impact to break. More specifically, when the position indicated by a two-dot chain line indicated by reference numeral C in FIGS. 1 and 3 is broken, the wire body 12 is deformed from a curved state to a substantially linear state to absorb an impact. I have. As described above, since the shock applied to the shock absorbing wire 10 is absorbed by the breaking of the maintenance portion 16 and the deformation of the wire body 12, it is possible to prevent the wire body 12 itself of the shock absorbing wire 10 from being broken. Is available. Further, since the impact is absorbed by breaking the wire fixing portion 14, the impact can be more effectively absorbed as compared with the configuration in which the impact is absorbed by friction.

  Here, a conventional shock absorbing wire 50 is shown in FIG. In the conventional shock absorbing wire 50, a part of the wire main body 52 is wound in an annular shape so as to overlap in the radial direction, and the overlapped portion is caulked by the tightening member 54 to fix the annular portion. It has become so. A part of the shock applied to the shock absorbing wire 50 is absorbed by the frictional force acting between the wire bodies 52 and the frictional force acting between the wire body 52 and the tightening member 54. . That is, when the impact is absorbed, the size of the loop of the annular portion of the wire main body 52 is reduced. On the other hand, since the shock absorbing wire 10 according to the present embodiment absorbs the shock by breaking the wire fixing portion 14 as described above, the impact absorbing wire 10 is higher than the conventional technology that absorbs the shock by friction. A shock absorbing effect can be achieved. In other words, when constructing a shock absorbing wire capable of absorbing a shock of the same size, the wire main body 12 having a smaller diameter as compared with the prior art can be used, and the shock absorbing wire can be used. 10 can be lightweight.

  Further, the wire main body 12 is deformed from a curved state to a substantially linear state after the maintenance portion 16 is broken. In other words, even if an impact smaller than a predetermined threshold value described below is applied to the impact absorbing wire 10, the wire main body 12 is not deformed. For this reason, the interval at which the maintenance or replacement of the shock absorbing wire 10 can be made longer than that of the prior art in which the wire is easily stretched even with a small impact, and the convenience of the shock absorbing wire 10 can be improved. .

  Moreover, since the wire main body 12 is deformed from the curved state to the substantially linear state after the maintenance portion 16 is broken, it is possible to suppress the adverse effect on the wire main body 12 after absorbing the impact. ing. That is, in the conventional shock absorbing wire 50 as shown in FIG. 4, the wire main body 52 is swaged by the tightening member 54 in a state of being wound once in an annular shape. The wire main body 52 is also in a state of being wound once in an annular shape (that is, after the annular portion is reduced). If a further impact is applied to the shock absorbing wire 50 in this state, a large load is applied to a place where the wire body 52 and the tightening member 54 are in contact, and the wire body 52 may be broken from the place. There is. On the other hand, in the present embodiment, since the wire fixing portion 14 is broken, it is possible to prevent the above-described problem from occurring. Further, since the wire main body 12 is not wound once in a ring shape but is simply curved, it is possible to prevent the wire main body 12 from being twisted after the wire fixing portion 14 is broken.

  Also, a plurality of types of wires having various strengths are prepared as the wire fixing portions 14 (specifically, the maintaining portions 16), and the threshold value of the magnitude of the impact at which the maintaining portions 16 break can be adjusted. It may be. More specifically, since the breaking load of the maintenance portion 16 can be calculated by a known method, the above-described predetermined threshold can be obtained by calculation, and therefore, the shock absorbing wire 10 having the intended predetermined threshold can be easily manufactured. And the energy value of the absorbed shock can be calculated.

  When a plurality of wire fixing portions 14 are provided on one shock absorbing wire 10, the structure of each wire fixing portion 14 may be different. Specifically, as the wire fixing portion 14, a plurality (for example, two) of different types of thresholds of the magnitude of the impact that breaks when an impact is applied to the impact absorbing wire 10 are arranged in series. May be used. According to such a configuration, the shock absorbing wire 10 having a simple configuration can appropriately absorb shocks of various magnitudes. For example, the wire fixing unit 14 in which the threshold value of the magnitude of the impact is a first value, the wire fixing unit 14 in which the threshold value of the magnitude of the impact is a second value larger than the first value, Is provided on each of the shock absorbing wires 10, and when a shock larger than the first value but smaller than the second value is applied to the shock absorbing wire 10, the threshold value of the shock magnitude is set to the first value. , Only one of the wire fixing portions 14 is broken. On the other hand, when an impact larger than the sum of the first value and the second value is applied to the shock absorbing wire 10, both the wire fixing portions 14 break. Further, when an impact larger than the second value and smaller than the sum of the first value and the second value is applied to the shock absorbing wire 10, one of the wire fixing portions 14 breaks. Become like As described above, by using a plurality of types of wire fixing portions 14 having different impact magnitude thresholds from each other, the impact applied to the shock absorbing wire 10 based on the number of the wire fixing portions 14 separated from the wire main body 12 is determined. Can be estimated.

  5 to 8 may be used as another example of the shock absorbing wire of the present embodiment. 5 to 8 are configuration diagrams each showing a configuration of another example of the shock absorbing wire.

  The shock absorbing wire 20 according to another example shown in FIG. 5 has a wire main body 22 and a wire fixing portion 24 for fixing the wire main body 22 in a curved state. Is larger than a predetermined threshold value, the wire fixing portion 24 breaks to absorb an impact. Here, the wire main body 22 of the shock absorbing wire 20 shown in FIG. 5 has substantially the same configuration as the wire main body 12 of the shock absorbing wire 10 shown in FIGS. FIG. 5 shows an embodiment in which one wire fixing portion 24 is provided on one shock absorbing wire 20. However, in practice, a plurality of wire fixing portions 24 are provided on one shock absorbing wire 20. Are provided in series.

  The wire fixing part 24 shown in FIG. 5 is different from the wire fixing part 14 shown in FIGS. 1 to 3 in that the support part and the maintenance part are not separated and one member also serves as the support part and the maintenance part. It has become. That is, the first portion 24a of the wire fixing portion 24 shown in FIG. 5 functions as a support portion for supporting the wire body 22 in a curved state, and the second portion 24b of the wire fixing portion 24 It functions as a maintaining portion for maintaining a curved state. Further, the first portion 24a and the second portion 24b are integral with each other. Then, even when an impact smaller than a predetermined threshold is applied to the shock absorbing wire 20, even if the curved shape of the wire main body 22 is going to be deformed, the deformation of the wire main body 22 is regulated by the wire fixing portion 24. I have.

  Further, the wire fixing portion 24 is configured to break when the shock applied to the shock absorbing wire 20 is larger than a predetermined threshold value and to break by absorbing the shock. More specifically, a shock is absorbed by breaking the wire main body 22 from a curved state to a substantially linear state by breaking a portion indicated by a two-dot chain line indicated by reference numeral C in FIG. As described above, since the shock applied to the shock absorbing wire 20 is absorbed by the breakage of the wire fixing portion 24 and the deformation of the wire body 22, the wire body 22 itself of the shock absorbing wire 20 is prevented from being broken. You can do it. In addition, since one member also serves as a support portion and a maintenance portion, when a portion indicated by a two-dot chain line indicated by reference numeral C in FIG. 5 breaks, the portion is broken by an impact applied to the shock absorbing wire 20. It is possible to prevent the moved wire fixing portion 24 from moving to a position away from the wire main body 22.

  Further, in the shock absorbing wire 30 according to still another example shown in FIG. 6, a plurality of (specifically, two) wire fixing portions 34 are provided in series on the shock absorbing wire 30. Further, each wire fixing portion 34 maintains a curved support portion 35 disposed inside the wire main body 32 in a curved state, and a curved state of the wire main body 32 so that the support portion 35 does not come off from the wire main body 32. And a retaining portion 36. More specifically, after the wire main body 32 is curved in a substantially U-shape and the curved state is supported by the support portion 35, both ends in the substantially U-shape are fixed by the maintenance portion 36. As a result, the curved shape shown in FIG. 6 is maintained. Therefore, even if the curved shape of the wire main body 32 is deformed when an impact smaller than the above-described predetermined threshold is applied to the shock absorbing wire 30, the deformation of the wire main body 32 is restricted by the support portion 35 and the maintaining portion 36. It is supposed to be.

  The holding portion 36 is formed of a ring-shaped wire, and the breaking of the wire causes the holding portion 36 to be broken from the wire main body 32. More specifically, the retaining portion 36 breaks and absorbs the impact when the impact applied to the impact absorbing wire 30 is greater than a predetermined threshold. As described above, since the shock applied to the shock absorbing wire 30 is absorbed by the break of the maintenance portion 36, it is possible to prevent the wire main body 32 of the shock absorbing wire 30 from being broken. . Although FIG. 6 shows a configuration in which only two wire fixing portions 34 are provided, the number of wire fixing portions 34 is not limited to two, and three or more wire fixing portions 34 are provided. May be provided. Further, the shock absorbing wire 30 provided with only one wire fixing portion 34 may be used.

  Further, a member different from the above-mentioned ring-shaped wire may be used as a maintaining portion for maintaining the curved state of the wire main body 32 so that the support portion 35 does not come off from the wire main body 32. For example, a cylindrical member that caulks and stops the wire body 32 may be used. In addition, a binding band or a carabiner may be used as the maintenance portion. Also in such a case, by preparing a plurality of types having various strengths as the maintenance portion, it becomes possible to adjust a predetermined threshold value when the maintenance portion breaks.

  7 and 8 includes a wire main body 42 and a wire fixing portion 44 for fixing the wire main body 42 in a curved state. More specifically, the wire fixing part 44 has a support part 45 made of a leaf spring bent in a curved shape, and a maintenance part 46. Openings 45a are formed near the ends of the support portions 45, respectively. The maintenance portion 46 has a rod-shaped portion 46a and annular portions 46b formed at both ends of the rod-shaped portion 46a and through which the wire main body 42 is passed. Further, the rod-shaped portion 46 a of the holding portion 46 is arranged so as to pass through each opening 45 a of the support portion 45. For this reason, even if the curved shape of the wire main body 42 is going to be deformed when an impact smaller than a predetermined threshold described later is applied to the shock absorbing wire 40, the deformation of the wire main body 42 is restricted by the support portion 45 and the maintaining portion 46. It is supposed to be.

  On the other hand, when the impact applied to the impact absorbing wire 40 is greater than a predetermined threshold, the portion indicated by the two-dot chain line indicated by the reference numeral C in FIG. 7 in the rod portion 46a of the maintaining portion 46 is broken. . Further, the shock applied to the shock absorbing wire 40 is absorbed by breaking the retaining portion 46 and deforming the wire main body 42 from the curved state to the substantially linear state. Further, in the shock absorbing wire 40, when the maintenance portion 46 is broken and the wire main body 42 is deformed from a curved state to a substantially linear state, the support portion 45 is also deformed. As shown in FIG. 7 and the like, since the support portion 45 is curved in a substantially U-shape, the substantially U-shaped ends of the support portion 45 are deformed away from each other after the maintenance portion 46 is broken. It is supposed to. As described above, in the shock absorbing wire 40, the shock can be absorbed by the support portion 45 even after the maintenance portion 46 is broken. Further, in this case, the shock can be flexibly absorbed with a simple configuration as compared with a case where shocks of different sizes are absorbed by arranging a plurality of shock absorbing wires having different predetermined threshold values in series. Will be able to do it. In other words, according to the shock absorbing wire 40, the shock can be absorbed more gently as compared with a configuration in which the shock is absorbed stepwise by setting a plurality of predetermined thresholds.

  As long as the member has elasticity, a member other than a leaf spring may be used as the supporting portion. FIGS. 7 and 8 show a mode in which one wire fixing portion 44 is provided for one shock absorbing wire 40, but a plurality of wire fixing portions 44 are provided for one shock absorbing wire 40. May be provided. Further, as the maintenance portion 46, one composed of an elastic member may be used. In this case, the impact applied to the impact absorbing wire can be more slowly absorbed.

  Next, a rockfall prevention system 100 will be described with reference to FIGS. 9 and 10 as an example of a system using the shock absorbing wire 10 shown in FIG. 1 and the like. Note that the shock absorbing wire used in the rock fall prevention system 100 is not limited to the shock absorbing wire 10, and the above-described shock absorbing wires 20, 30, 40 and the shock absorbing wires 70, 80, 90 described later may be used. It may be. In FIG. 10, a falling object falling along the slope is indicated by reference numeral D.

  The rock fall prevention system 100 shown in FIGS. 9 and 10 is installed on a slope 300 such as a mountain, so that a falling object such as a stone falling from the mountain side to the valley side along the slope 300 (for example, see FIG. 10). (Indicated by reference symbol D). In addition, the rock fall prevention system 100 includes pillars 110 arranged on the slope 300 at predetermined intervals, and a falling object receiving member 120 that is stretched on each of the pillars 110 and receives falling objects falling along the slope 300. And a shock absorbing wire 10 stretched between each column 110 and the slope 300 on the mountain side. When using the shock absorbing wire 10 having a plurality of types of wire fixing portions 14 having different shock thresholds from each other, the side closer to the falling object receiving member 120 of the shock absorbing wire 10 (that is, the right side in FIG. 10). The wire fixing portion 14 having a large impact threshold is arranged at the second position.

  Further, each of the columns 110 is mounted at substantially the same height level on the slope 300 via each of the base members 112 fixed to the slope 300. In the present embodiment, as shown in FIG. 10, each column 110 and each base member 112 are connected by, for example, a hinge 114 that opens on both sides, and each column 110 is connected to each base member 112 (ie, It is possible to swing with respect to the slope 300) (the swing direction of each column 110 is indicated by an arrow A in FIG. 10). This makes it possible to reduce the stress acting on each of the columns 110 when the falling object is received by the falling object receiving member 120. The member connecting each support 110 and each base member 112 is not limited to the hinge 114 described above, and another member may be used.

  Further, in the rock fall prevention system 100 shown in FIGS. 9 and 10, a wire mesh is used as the fallen object receiving member 120 for receiving a fallen object, but the present invention is not limited to such a configuration. For example, a fence made of a metal plate or a ring-shaped net may be used as a falling object receiving member.

  Here, as a conventional rock fall prevention system, when the fallen object receiving member receives a fallen object by allowing the wire to extend as shown in FIG. A device using a shock-absorbing wire that absorbs an applied shock is known. However, in the above configuration, the wire extends even when the magnitude of the applied impact is small, and the wire is easily extended even with a small impact, so that there is a problem that the maintenance of the wire needs to be performed at relatively short intervals. there were. On the other hand, according to the rock fall prevention system 100 according to the present embodiment, maintenance of the rock fall prevention system 100 is performed by using the shock absorbing wire 10 that absorbs a shock only when a shock greater than a predetermined threshold is applied. Work can be reduced.

  The shock absorbing wires 10, 20, 30, and 40 configured to absorb shocks as described above have the wire bodies 12, 22, 32, and 42 and the wire bodies 12, 22, 32, and 42 bent. Wire fixing portions 14, 24, 34, and 44 for fixing the wires when the magnitude of the shock applied to the shock absorbing wires 10, 20, 30, 40 is larger than a predetermined threshold value. Since the portions 14, 24, 34, 44 are broken, the wire bodies 12, 22, 32, 42 are deformed from the curved state when the wire fixing portions 14, 24, 34, 44 are broken. Shock can be absorbed. In addition, since the wire fixing portions 14, 24, 34, and 44 are configured to absorb the shock by breaking, the shock can be more effectively absorbed as compared with the structure in which the shock is absorbed by friction. .

  Further, the wire fixing portions 14, 24, 34, and 44 have curved support portions 15, 24a, 35, and 45 disposed inside the wire bodies 12, 22, 32, and 42 in a curved state. Therefore, the wire bodies 12, 22, 32, 42 can be easily curved along the shapes of the support portions 15, 24a, 35, 45. Further, the wire fixing portions 14, 24, 34, 44 adjust the bending state of the wire bodies 12, 22, 32, 42 so that the support portions 15, 24a, 35, 45 do not come off from the wire bodies 12, 22, 32, 42. It further has a retaining portion 16, 24b, 36, 46 for retaining, so that when a shock smaller than a predetermined threshold is applied to the shock absorbing wires 10, 20, 30, 40, the wire bodies 12, 22, 32 are provided. , 42 can be prevented from being deformed. Further, when the magnitude of the impact applied to the impact absorbing wires 10, 20, 30, 40 is greater than a predetermined threshold value, the retaining portions 16, 24b, 36, 46 break. Also, as the wire fixing portions 14, 24, 34, 44, a plurality of types having different threshold values of the magnitude of impact at which the wire fixing portions 14, 24, 34, 44 break are used so that they are arranged in series. Therefore, the shock absorbing wires 10, 20, 30, and 40 having a simple configuration can appropriately absorb shocks of various sizes.

  In addition, the rockfall prevention system 100 having the above-described configuration includes a plurality of pillars 110 arranged on the slope 300 at predetermined intervals, and a falling object that is stretched on each pillar 110 and falls along the slope 300. The falling object receiving member 120 to be received, the wire bodies 12, 22, 32, 42 stretched between the respective support columns 110 and the slope 300 on the mountain side, and the wire bodies 12, 22, 32, 42 are fixed in a curved state. Wire fixing portions 14, 24, 34, and 44. When the magnitude of the impact when the falling object is received by the falling object receiving member 120 is larger than a predetermined threshold, the wire fixing portions 14, 24, 34, and 44 are broken, so that the impact is absorbed by friction. The impact can be more effectively absorbed as compared with the conventional configuration. In addition, the installation of the valley-side wires (that is, the shock absorbing wires 10, 20, 30, and 40 arranged on the valley side) can be omitted, and the maintenance work of the rockfall prevention system 100 can be reduced.

  The shock absorbing wires 10, 20, 30, 40 and the rock fall prevention system 100 according to the present embodiment are not limited to the above-described embodiments, and various changes can be made.

  For example, when the holding portions 16, 24b, 36, 46 of the wire fixing portions 14, 24, 34, 44 break, the support portions 15, 24a, 35, 45 may also break. That is, when the magnitude of the shock applied to the shock absorbing wires 10, 20, 30, 40 is greater than a predetermined threshold, the support portions 15, 24a, 35, 45 are broken so that the shock is absorbed. It may be. Further, the support portions 15, 24a, 35, and 45 are not limited to those having the shapes described above, and other members having a curved shape may be used.

  Further, the curved portions of the wire bodies 12, 22, 32, 42 are maintained such that the support portions 15, 24a, 35, 45 do not come off from the wire bodies 12, 22, 32, 42 by the maintaining portions 16, 24b, 36, 46. Alternatively, the wire bodies 12, 22, 32, 42 may be welded together to form an annular portion, so that the wire bodies 12, 22, 32, 42 maintain a curved state.

  Further, it is not always necessary to attach the shock absorbing wires 10, 20, 30, 40 to all the columns 110. When the strength of the rock fall prevention system is ensured, the strut 110 to which the shock absorbing wires 10, 20, 30, 40 are attached and the strut 110 to which the shock absorbing wires 10, 20, 30, 40 are not attached are provided. A rock fall prevention system that alternates may be used. Alternatively, the strut 110 to which the shock absorbing wires 10, 20, 30, 40 are attached and the strut 110 to which the shock absorbing wires 10, 20, 30, 40 are not attached are arranged differently from those described above. A rock fall prevention system may be used.

  Further, as the curved shape of the wire bodies 12, 22, 32, and 42, the wire bodies 12, 22, 32, and 42 are bent upward as shown in FIG. , 32, 42 are not limited to those described above. For example, the wire bodies 12, 22, 32, 42 may be curved downward. Further, the wire bodies 12, 22, 32, 42 which are curved upward and the wire bodies 12, 22, 32, 42 which are curved downward are alternately arranged. You may.

  The applications of the above-described shock absorbing wires 10, 20, 30, 40 are not limited to the rockfall prevention system 100 described above. For example, the shock absorbing wires 10, 20, 30, 40 described above can be used in various civil engineering structures and constructions. Further, by using the shock absorbing wires 10, 20, 30, and 40 as the guardrail and the median strip, the shock when a vehicle or the like collides may be absorbed. Also, the shock absorbing wires 10, 20, 30, 40 can be used for various other applications.

  Further, as the shock absorbing wire according to the present embodiment, a modified example shown in FIGS. 11 to 15 may be used. 11 to 13 are diagrams for explaining the configuration of the shock absorbing wire 70 according to the modification, and FIG. 14 is a diagram for explaining the configuration of the shock absorbing wire 80 according to another modification. Drawing 15 is a figure for explaining the composition of shock absorption wire 90 concerning other modification.

  Further, the shock absorbing wire 70 shown in FIGS. 11 to 13 has two wire bodies 72 and a wire fixing portion 74 made of a cylindrical member having a hollow portion. Further, the wire fixing portions 74 are caulked in a state where the ends of the respective wire main bodies 72 are inserted into both ends of the wire fixing portions 74, respectively, so that the respective wire main bodies 72 do not come off from the wire fixing portions 74. . Further, both ends of a spring 76 wound a plurality of times so as to surround the wire fixing portion 74 are attached near both end edges of the wire fixing portion 74 (see FIGS. 11 and 12).

  When the impact applied to the shock absorbing wire 70 is greater than a predetermined threshold, the location of the two-dot chain line indicated by reference numeral C in FIG. The applied shock is absorbed. Further, after the wire fixing portion 74 is broken, the spring 76 wound around the wire fixing portion 74 is deformed in the direction of the arrow in FIG. 13 so that the shock applied to the shock absorbing wire 70 is absorbed. . Thus, when the spring 76 is deformed in the longitudinal direction, the shock applied to the shock absorbing wire 70 is more efficiently absorbed.

  Further, the shock absorbing wire 80 shown in FIG. 14 has two wire main bodies 82 and a wire fixing portion 84 including a rod portion 84a and annular portions 84b formed at both ends of the rod portion 84a. . Each wire body 82 is folded back after being passed through each annular portion 84b of the wire fixing portion 84, and is crimped by the tubular member 88 together with the tip of the folded portion. In other words, the wire fixing portions 84 are arranged such that the annular portions 84b of the wire fixing portions 84 are located inside the eye portions formed at the ends of the respective wire main bodies 82. Further, both ends of a spring 86 wound a plurality of times so as to surround the wire fixing portion 84 are attached to the outer peripheral surface near both end edges of the wire fixing portion 84 (see FIG. 14).

  When the impact applied to the shock absorbing wire 80 is larger than a predetermined threshold, the portion of the wire fixing portion 84 indicated by a two-dot chain line indicated by the reference numeral C in FIG. The applied shock is absorbed. Further, even after the wire fixing portion 84 is broken, the shock applied to the shock absorbing wire 80 can be absorbed by the spring 86 wound around the wire fixing portion 84 deforming in the left-right direction in FIG. ing. As described above, when the spring 86 is deformed in the longitudinal direction, the impact applied to the impact absorbing wire 80 is more efficiently absorbed.

  The shock absorbing wire 90 shown in FIG. 15 has a wire main body 92 and a wire fixing portion 94 for fixing the wire main body 92 in a curved state. More specifically, the wire fixing portion 94 has a rod portion 94a and annular portions 94b formed at both ends of the rod portion 94a and through which the wire body 92 passes. Note that the example shown in FIG. 15 does not have a curved support portion disposed inside the wire main body 92 in a curved state like the shock absorbing wire 10 shown in FIG. 1 and the like. However, by providing an extra length for the wire passing through the annular portion 94b of the wire fixing portion 94, a part of the wire main body 92 can be maintained in a curved state. Further, both ends of a spring 96 wound a plurality of times so as to surround the wire fixing portion 94 are attached to the outer peripheral surface near both end edges of the wire fixing portion 94 (see FIG. 15).

  When the impact applied to the shock absorbing wire 90 is greater than a predetermined threshold, the portion of the wire fixing portion 94 indicated by a two-dot chain line indicated by the reference numeral C in FIG. The applied shock is absorbed. Further, even after the wire fixing portion 94 is broken, the impact applied to the shock absorbing wire 90 can be absorbed by the spring 96 wound around the wire fixing portion 94 deforming in the left-right direction in FIG. ing. Thus, when the spring 96 is deformed in the longitudinal direction, the shock applied to the shock absorbing wire 90 is more efficiently absorbed.

DESCRIPTION OF SYMBOLS 10 Shock absorbing wire 12 Wire main body 14 Wire fixing part 15 Supporting part 16 Maintenance part 16a Through hole 17 Connection member 20 Shock absorbing wire 22 Wire main body 24 Wire fixing part 24a First part 24b Second part 30 Shock absorbing wire 32 Wire main body 34 Wire fixing part 35 Supporting part 36 Maintaining part 40 Shock absorbing wire 42 Wire main body 44 Wire fixing part 45 Supporting part 45a Opening 46 Maintaining part 46a Bar-shaped part 46b Annular part 50 Shock absorbing wire 52 Wire main body 54 Tightening member 70 Shock absorbing wire 72 Wire Main body 74 Wire fixing portion 76 Spring 80 Shock absorbing wire 82 Wire main body 84 Wire fixing portion 84a Rod portion 84b Annular portion 86 Spring 88 Tubular member 90 Impact absorbing wire 92 Wire main body 94 Wire fixing portion 94a Rod portion 94b Annular portion 96 Spring 1 0 rockfall prevention system 110 strut 112 base member 114 hinge 120 falling object receiving member 300 slopes

Claims (6)

A shock absorbing wire for absorbing a shock,
It has a wire body and a wire fixing portion for fixing the wire body in a curved state,
The shock absorbing wire, wherein the wire fixing portion breaks when a magnitude of a shock applied to the shock absorbing wire is larger than a predetermined threshold.   The shock absorbing wire according to claim 1, wherein the wire fixing portion has a curved supporting portion disposed inside the wire main body in a curved state.   The shock absorbing wire according to claim 2, wherein the wire fixing portion further includes a maintaining portion that maintains a curved state of the wire main body so that the support portion does not come off from the wire main body.   The shock absorbing wire according to claim 3, wherein the maintenance portion breaks when a magnitude of a shock applied to the shock absorbing wire is larger than a predetermined threshold.   The plurality of types having different thresholds of the magnitude of an impact at which the wire fixing portion breaks when an impact is applied to the shock absorbing wire are used as the wire fixing portion so as to be arranged in series. The shock absorbing wire according to any one of claims 1 to 4. A plurality of struts arranged on a slope at predetermined intervals,
A falling object receiving member that is stretched over each of the columns and receives a falling object that falls along the slope;
It has a wire main body stretched between each of the columns and the slope on the mountain side, and a wire fixing portion for fixing the wire main body in a curved state, and a falling object is received by the falling object receiving member. When the magnitude of the impact given when it is greater than a predetermined threshold, the wire fixing portion breaks an impact absorbing wire,
Rockfall prevention system with

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