JP7126978B2 - Shock-absorbing wire and anti-fall system - Google Patents

Description

TECHNICAL FIELD The present invention relates to a shock-absorbing wire for absorbing shock, and a rockfall prevention system installed on a slope of a mountain or the like using such a shock-absorbing wire.

2. Description of the Related Art Conventionally, in a falling rock protection fence installed on a slope of a mountain or the like to catch falling rocks, an impact absorption wire is used to absorb the impact when the falling rock is caught by the falling rock protection fence. More specifically, as a rockfall protection fence using such a shock absorbing wire, the one disclosed in FIG. 1 of Patent Document 1 and the like is known.

The fall protection fence disclosed in FIG. 1 of Patent Document 1 includes pillars arranged on a slope at a predetermined interval, a mountain-side wire stretched between the upper end of the pillar and the mountain-side slope, and the pillars. It has a ring-type net or the like that is stretched between them to catch falling rocks. In addition, by allowing deformation (elongation) of the mountain-side wire, etc., when falling rocks are received by the ring-type net, part of the impact applied to the mountain-side wire, etc., is absorbed by this elongation of the mountain-side wire. It's becoming More specifically, a ring-shaped portion is formed by winding a portion of the crest-side wire so that it overlaps in the radial direction, and the ring-shaped portion is fixed by crimping a tightening member arranged in the overlapped portion. It's like When an impact is applied, the size of the ring of the annular portion becomes smaller, so that part of the impact when receiving falling rocks is absorbed by the frictional force acting between the mountain-side wire and the tightening member. It has become so.

Japanese Patent No. 5978022

However, the conventional shock absorbing wire disclosed in Patent Document 1 absorbs the shock applied to the wire by allowing elongation of the wire. The wire is stretched 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 tends to stretch even with a small impact.

The present invention has been made in consideration of such points. , and to provide a rockfall prevention system using such a shock absorbing wire.

A shock-absorbing wire of the present invention is a shock-absorbing wire for absorbing a shock, comprising a wire body and a wire fixing portion for fixing the wire body in a curved state, and the shock-absorbing wire The wire fixing portion is broken when the magnitude of the impact applied to the wire is larger than a predetermined threshold value.

According to such an impact-absorbing wire, the wire fixing portion is broken only when an impact greater than a predetermined threshold is applied, thereby deforming the wire main body from the curved state. can absorb the impact when it breaks.

In the shock absorbing wire of the present invention, the wire fixing portion may have a curved support portion arranged inside the curved wire body.

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

Further, in the shock absorbing wire of the present invention, the retaining portion may break when the magnitude of the shock applied to the shock absorbing wire is greater than a predetermined threshold value.

Further, as the wire fixing portion, a plurality of types of wire fixing portions having different threshold values for the magnitude of impact 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.

The rockfall prevention system of the present invention includes a plurality of posts arranged on a slope at predetermined intervals, a falling object receiving member stretched over each of the posts and receiving falling objects falling along the slope, and It has a wire body stretched between the support and the slope on the mountain side, and a wire fixing portion that fixes the wire body in a curved state, and the falling object receiving member receives the falling object. and a shock absorbing wire that breaks the wire fixing portion when the magnitude of the shock applied when the wire is broken is greater than a predetermined threshold value.

According to such a rockfall prevention system, an impact-absorbing wire is used that deforms the wire body from its curved state and absorbs impact by breaking the wire fixing portion only when an impact greater than a predetermined threshold is applied. As a result, maintenance work can be reduced.

According to the shock-absorbing wire and rockfall prevention system of the present invention, the shock applied to the shock-absorbing wire is absorbed by breaking the wire fixing portion only when a shock greater than a predetermined threshold is applied. can do.

1 is a configuration diagram showing the configuration of a shock absorbing wire according to an embodiment of the present invention; FIG. FIG. 2 is a perspective view showing the configuration of a support portion in the wire fixing portion of the shock absorbing wire shown in FIG. 1; FIG. 2 is a perspective view showing a configuration of a maintenance portion in a wire fixing portion of the shock absorbing wire shown in FIG. 1; 1 is a perspective view showing the configuration of a conventional shock absorbing wire; FIG. FIG. 4 is a configuration diagram showing another example configuration of the shock absorbing wire according to the embodiment of the present invention; FIG. 4 is a configuration diagram showing still another configuration of the shock absorbing wire according to the embodiment of the present invention; FIG. 4 is a configuration diagram showing still another configuration of the shock absorbing wire according to the embodiment of the present invention; FIG. 4 is a configuration diagram showing still another configuration of the shock absorbing wire according to the embodiment of the present invention; FIG. 2 is a perspective view schematically showing the configuration of a rockfall prevention system using the shock absorbing wire shown in FIG. 1; FIG. 10 is a side view schematically showing the configuration of the rockfall prevention system shown in FIG. 9; FIG. 4 is a side view showing a configuration of a modification of the shock absorbing wire according to the embodiment of the invention; FIG. 12 is a front view showing a configuration of a wire fixing portion and a spring in the shock absorbing wire shown in FIG. 11; FIG. 13 is an explanatory diagram illustrating the operation of absorbing a shock by the shock absorbing wire shown in FIGS. 11 and 12; FIG. 11 is a side view showing the configuration of another modification of the shock absorbing wire according to the embodiment of the present invention; FIG. 11 is a side view showing the configuration of still another modification of the shock absorbing wire according to the embodiment of the present invention;

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 to 10 are diagrams for explaining the shock absorbing wire and the rockfall prevention system according to this 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 respectively a support portion and a maintenance portion of the wire fixing portion of the shock absorbing wire shown in FIG. 1 is a perspective view showing the configuration of the . 4 is a perspective view showing the structure of a shock absorbing wire according to the prior art, and FIGS. 5 to 8 are structural diagrams showing structures of other examples of the shock absorbing wire according to the embodiment of the present invention, respectively. is. 9 is a perspective view schematically showing the configuration of the rockfall prevention system using the shock absorbing wire shown in FIG. 1, and FIG. 10 is a side view schematically showing the configuration of the rockfall prevention system shown in FIG. It is a diagram.

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

In addition, the wire fixing portion 14 includes a disk-shaped support portion 15 arranged inside the wire body 12 in a curved state, and a support portion 15 that maintains the curved state of the wire body 12 so that the support portion 15 does not come off the wire body 12 . a portion 16; The supporting portion 15 and the maintaining portion 16 are connected by a connecting member 17 such as a string, and the connecting member 17 fixes the relative positional relationship between the supporting portion 15 and the maintaining portion 16. It's becoming After the wire body 12 is bent into a substantially U-shape and supported by the support portion 15 in a curved state, both ends of the substantially U-shape are fixed by the maintaining portion 16. This maintains the curved shape as shown in FIG. More specifically, as shown in FIG. 3, the maintenance portion 16 is an elongated plate-like member provided with two through holes 16a. Both ends of the shape are passed through. Therefore, even if the curved shape of the wire body 12 attempts to deform when an impact smaller than a predetermined threshold, which will be described later, is applied to the shock absorbing wire 10, the deformation of the wire body 12 is restricted by the supporting portion 15 and the maintaining portion 16. It is designed to be

Further, the retaining portion 16 is broken by breaking and absorbing the shock when the shock applied to the shock absorbing wire 10 is larger than a predetermined threshold value. More specifically, by breaking the two-dot chain line indicated by reference symbol C in FIGS. 1 and 3, the wire body 12 is deformed from a curved state to a substantially straight state, thereby absorbing impact. there is In this way, the impact applied to the impact-absorbing wire 10 is absorbed by the breakage of the retaining portion 16 and the deformation of the wire body 12, thereby preventing the wire body 12 itself of the impact-absorbing wire 10 from breaking. is now possible. Moreover, since the wire fixing portion 14 is adapted to absorb the impact by breaking, the impact can be absorbed more effectively than the configuration in which the impact is absorbed by friction.

Here, a prior art shock absorbing wire 50 is shown in FIG. In the shock absorbing wire 50 of the prior art, the wire body 52 is partially wound in an annular shape so that it overlaps in the radial direction. It has become so. Also, part of the impact applied to the impact 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 ring size of the annular portion of the wire body 52 is reduced. On the other hand, the impact absorbing wire 10 according to the present embodiment absorbs impact by breaking the wire fixing portion 14 as described above. A shock absorbing effect can be exhibited. In other words, when constructing a shock absorbing wire capable of absorbing a shock of similar magnitude, it becomes possible to use a wire body 12 having a smaller diameter than that of the prior art, and at the same time, the shock absorbing wire 10 can be lightweight.

Further, the wire body 12 is deformed from a curved state to a substantially straight state after the retaining portion 16 is broken. In other words, the wire body 12 is not deformed even if the impact absorbing wire 10 is subjected to an impact smaller than a predetermined threshold, which will be described later. For this reason, compared with the prior art, which tends to stretch the wire even with a small impact, it is possible to lengthen the interval for maintenance or replacement of the shock absorbing wire 10, thereby improving the convenience of the shock absorbing wire 10. .

In addition, since the wire body 12 is deformed from a curved state to a substantially straight state after the retaining portion 16 is broken, it is possible to suppress adverse effects on the wire body 12 after absorbing the impact. ing. That is, in the shock absorbing wire 50 of the prior art as shown in FIG. 4, the wire body 52 is crimped by the tightening member 54 in a state in which the wire body 52 is wound in an annular shape. (That is, after the annular portion has contracted), the wire body 52 is in a state of being looped once. In this state, if a further shock is applied to the shock absorbing wire 50, a large load will be applied to the portion where the wire body 52 and the tightening member 54 are in contact, and the wire body 52 may break from that portion. have a nature. On the other hand, in the present embodiment, since the wire fixing portion 14 is designed to break, it is possible to prevent the above-described problems from occurring. Moreover, since the wire body 12 is not wound circularly, but simply curved, it is possible to prevent the wire body 12 from being twisted after the wire fixing portion 14 is broken.

In addition, a plurality of types of wire fixing portions 14 (specifically, maintaining portions 16) having various strengths are prepared so that the threshold value of the magnitude of impact at which the maintaining portions 16 break can be adjusted. can be More specifically, since the breaking load of the retaining portion 16 can be calculated by a known method, the predetermined threshold can be obtained by calculation. , and the value of the energy of the impact to be absorbed can also be calculated.

Further, when a plurality of wire fixing portions 14 are provided on one shock absorbing wire 10, each wire fixing portion 14 may have a different structure. Specifically, as the wire fixing portion 14, a plurality (for example, two) of types having mutually different threshold values for the magnitude of the shock that breaks when the impact-absorbing wire 10 is subjected to an impact are arranged in series. may be used. According to such a configuration, the impact-absorbing wire 10 having a simple configuration can appropriately absorb impacts of various magnitudes. For example, the wire fixing portion 14 having a first threshold value for the magnitude of impact, and the wire fixing portion 14 having a second threshold value for the magnitude of impact greater than the first value. are provided on the shock absorbing wire 10, and when a shock greater than the first value but less than the second value is applied to the shock absorbing wire 10, the threshold value of the magnitude of the shock is the first Only one wire fixing portion 14 having a value of is broken. On the other hand, when an impact greater than the sum of the first value and the second value is applied to the shock absorbing wire 10, both wire fixing portions 14 are broken. Further, when an impact greater than the second value and less 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. In this way, by using a plurality of types of wire fixing portions 14 having different threshold values for the magnitude of impact, the impact applied to the shock absorbing wire 10 can be reduced based on the number of the wire fixing portions 14 detached from the wire body 12 . be able to infer the size of

As another example of the shock absorbing wire of this embodiment, those shown in FIGS. 5 to 8 may be used. 5 to 8 are configuration diagrams showing configurations of other examples of the shock absorbing wire.

A shock absorbing wire 20 according to another example shown in FIG. is larger than a predetermined threshold value, the wire fixing portion 24 breaks to absorb the impact. Here, the wire body 22 of the shock absorbing wire 20 shown in FIG. 5 has substantially the same structure as the wire body 12 of the shock absorbing wire 10 shown in FIGS. 5 shows a mode in which one wire fixing portion 24 is provided for one shock absorbing wire 20, but in reality, one shock absorbing wire 20 is provided with a plurality of wire fixing portions 24. are arranged in series.

Also, unlike the wire fixing part 14 shown in FIGS. 1 to 3, the wire fixing part 24 shown in FIG. It has become. That is, the first portion 24a of the wire fixing portion 24 shown in FIG. It functions as a maintenance portion that maintains the curved state. Also, the first portion 24a and the second portion 24b are integral and indivisible. Even if the curved shape of the wire body 22 attempts to deform when an impact smaller than a predetermined threshold is applied to the shock absorbing wire 20, the deformation of the wire body 22 is restricted by the wire fixing portion 24. there is

Further, the wire fixing portion 24 is designed to be broken by breaking and absorbing the shock when the shock applied to the shock absorbing wire 20 is larger than a predetermined threshold value. More specifically, the wire body 22 is deformed from a curved state to a substantially straight state by breaking a portion indicated by a chain double-dashed line indicated by reference symbol C in FIG. 5, thereby absorbing impact. In this way, 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, thereby preventing the wire body 22 itself of the shock absorbing wire 20 from being broken. It is possible to do so. In addition, since one member serves both as a supporting portion and a maintaining portion, when the portion indicated by the two-dot chain line indicated by reference symbol C in FIG. It is possible to prevent the wire fixing portion 24 from moving to a position away from the wire main body 22 .

In addition, a shock absorbing wire 30 according to still another example shown in FIG. 6 has a plurality of (specifically, two) wire fixing portions 34 provided in series. In addition, each wire fixing portion 34 includes a curved support portion 35 disposed inside the wire body 32 in a curved state, and maintains the curved state of the wire body 32 so that the support portion 35 does not come off the wire body 32. a retaining portion 36; More specifically, the wire body 32 is bent into a substantially U-shape and supported in the curved state by the support portions 35 so that both ends of the substantially U-shape are fixed by the maintaining portions 36 . , which maintains the curved shape as shown in FIG. Therefore, even if the curved shape of the wire body 32 tries to be deformed when an impact smaller than the above-described predetermined threshold is applied to the shock absorbing wire 30, the deformation of the wire body 32 is restricted by the supporting portion 35 and the maintaining portion 36. It is designed to be

Further, the retaining portion 36 is composed of a ring-shaped wire, and when the wire is broken, the retaining portion 36 is broken off from the wire body 32 . More specifically, the retaining portion 36 breaks to absorb the impact when the impact applied to the impact absorbing wire 30 is greater than a predetermined threshold. In this way, since the impact applied to the impact absorbing wire 30 is absorbed by the breakage of the retaining portion 36, it is possible to prevent the wire body 32 of the impact absorbing wire 30 from breaking. . Although FIG. 6 illustrates 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. Alternatively, a shock absorbing wire 30 having only one wire fixing portion 34 may be used.

Moreover, a member different from the above-described ring-shaped wire may be used as a maintaining portion that maintains the curved state of the wire body 32 so that the support portion 35 does not come off from the wire body 32 . For example, a cylindrical member for crimping and fixing the wire body 32 may be used. Also, a binding band or a carabiner may be used as the holding portion. In such a case as well, by preparing a plurality of types of sustaining portions having various strengths, it is possible to adjust the predetermined threshold at which the sustaining portion breaks.

A shock absorbing wire 40 according to still another example shown in FIGS. 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 portion 44 has a support portion 45 made of a leaf spring bent into a curved shape, and a maintenance portion 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 body 42 is passed. Also, a rod-like portion 46 a of the retaining portion 46 is arranged to pass through each opening 45 a of the supporting portion 45 . Therefore, even if the curved shape of the wire body 42 tries to be deformed when an impact smaller than a predetermined threshold, which will be described later, is applied to the shock absorbing wire 40, the deformation of the wire body 42 is restricted by the supporting portion 45 and the maintaining portion 46. It is designed to be

On the other hand, when the impact applied to the impact-absorbing wire 40 is greater than the predetermined threshold value, the rod-shaped portion 46a of the retaining portion 46 is broken at the two-dot chain line indicated by reference symbol C in FIG. . Further, the retaining portion 46 is broken and the wire body 42 is deformed from the curved state to the substantially straight state, thereby absorbing the shock applied to the shock absorbing wire 40 . Further, in the shock absorbing wire 40, when the retaining portion 46 is broken and the wire body 42 is deformed from a curved state to a substantially straight state, the supporting 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, after the sustaining portion 46 is broken, the substantially U-shaped ends of the support portion 45 are deformed in a direction away from each other. It is designed to In this manner, the shock absorbing wire 40 is designed so that the supporting portion 45 can absorb the shock even after the sustaining portion 46 is broken. Moreover, in this case, compared to the case where a plurality of shock absorbing wires having different predetermined threshold values are arranged in series to absorb different magnitudes of shocks, shocks can be flexibly absorbed with a simple configuration. be able to In other words, according to the shock absorbing wire 40, the shock can be absorbed more moderately compared to the configuration in which the shock is gradually absorbed by setting a plurality of predetermined threshold values.

A member other than the plate spring may be used as the supporting portion as long as it is a member having elasticity. 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. In addition, as the maintenance portion 46, one configured by an elastic member may be used. In this case, the shock applied to the shock absorbing wire can be absorbed more gently.

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 impact-absorbing wire used in the rockfall prevention system 100 is not limited to the impact-absorbing wire 10, and the impact-absorbing wires 20, 30, and 40 described above and the impact-absorbing wires 70, 80, and 90 described later may be used. can be Also, in FIG. 10, the reference symbol D denotes a falling object that falls along the slope.

The rockfall prevention system 100 shown in FIGS. 9 and 10 is installed on a slope 300 of a mountain or the like so that falling objects such as stones (see, for example, FIG. 10) fall along the slope 300 from the mountain side toward the valley side. indicated by symbol D). In addition, the rockfall prevention system 100 includes pillars 110 arranged on the slope 300 at predetermined intervals, and falling object receiving members 120 stretched over each pillar 110 to receive falling objects falling along the slope 300. and a shock absorbing wire 10 stretched between each strut 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 with different shock thresholds, the side of the shock absorbing wire 10 closer to the falling object receiving member 120 (that is, the right side in FIG. 10) The wire fixing portion 14 having a large shock threshold is arranged at the position.

In addition, each support 110 is attached at substantially the same height level on the slope 300 via each base member 112 fixed to the slope 300 . In this embodiment, as shown in FIG. 10, each strut 110 and each base member 112 are connected by, for example, hinges 114 that open on both sides. 300) (the swinging direction of each strut 110 is indicated by an arrow A in FIG. 10). This makes it possible to reduce the stress acting on each support 110 when a falling object is received by the falling object receiving member 120 . The member that connects each support 110 and each base member 112 is not limited to the hinge 114 described above, and other members may be used.

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

Here, as a conventional rockfall prevention system, by allowing elongation of a wire as shown in FIG. It is known to use a shock-absorbing wire that absorbs the shock of being hit. However, in the above configuration, the wire stretches even when the magnitude of the impact applied is small, and the wire tends to stretch even with a small impact, so there is a problem that maintenance of the wire must be performed at relatively short intervals. there were. On the other hand, according to the rockfall prevention system 100 according to the present embodiment, maintenance of the rockfall prevention system 100 is performed by using the shock absorbing wire 10 that absorbs the shock only when a shock greater than a predetermined threshold is applied. It becomes possible to reduce the time and effort of

The shock absorbing wires 10, 20, 30, 40 configured as described above for absorbing shock are wire bodies 12, 22, 32, 42 and wire bodies 12, 22, 32, 42 that are curved. and wire fixing portions 14, 24, 34, 44 for fixing the wires 10, 20, 30, 40 in a fixed state. Since the portions 14, 24, 34, 44 are to be broken, the wire main bodies 12, 22, 32, 42 are deformed from the curved state when the wire fixing portions 14, 24, 34, 44 are broken. It can absorb impact. In addition, since the wire fixing portions 14, 24, 34, and 44 are adapted to absorb the impact by breaking, the impact can be absorbed more effectively compared to the configuration in which the impact is absorbed by friction. .

Further, the wire fixing portions 14, 24, 34, 44 have curved support portions 15, 24a, 35, 45 arranged inside the curved wire bodies 12, 22, 32, 42. Therefore, the wire bodies 12 , 22 , 32 , 42 can be easily bent along the shapes of the support portions 15 , 24 a , 35 , 45 . The wire fixing portions 14, 24, 34, 44 keep the wire bodies 12, 22, 32, 42 in a curved state so that the support portions 15, 24a, 35, 45 are not detached from the wire bodies 12, 22, 32, 42. It further has a retaining portion 16, 24b, 36, 46 that maintains the wire body 12, 22, 32 when the impact absorbing wire 10, 20, 30, 40 is subjected to an impact less than a predetermined threshold. , 42 can be prevented from being deformed. Further, the retaining portions 16, 24b, 36, 46 break when the magnitude of the impact applied to the impact absorbing wires 10, 20, 30, 40 is greater than a predetermined threshold. In addition, as the wire fixing portions 14, 24, 34, 44, a plurality of types having different threshold values for the magnitude of the shock at which the wire fixing portions 14, 24, 34, 44 break are arranged in series. Therefore, the impact absorbing wires 10, 20, 30, 40 having a simple configuration can appropriately absorb impacts of various magnitudes.

In addition, the rockfall prevention system 100 configured as described above includes a plurality of pillars 110 arranged on the slope 300 at predetermined intervals, and each pillar 110 stretched to prevent falling objects falling along the slope 300. The wire bodies 12, 22, 32, and 42 and the wire bodies 12, 22, 32, and 42 stretched between the falling object receiving member 120 for receiving and each support 110 and the slope 300 on the mountain side are fixed in a curved state. The wire fixing portions 14, 24, 34, 44 are provided. The wire fixing portions 14, 24, 34, and 44 break when the magnitude of the impact when the falling object is received by the falling object receiving member 120 is greater than a predetermined threshold value, so the impact is absorbed by friction. It is possible to absorb impacts more effectively than the conventional configuration. In addition, installation of the valley-side wires (that is, the impact-absorbing wires 10, 20, 30, and 40 arranged on the valley side) can be omitted, and maintenance work for the rockfall prevention system 100 can be reduced.

The shock absorbing wires 10, 20, 30, and 40 and the rockfall prevention system 100 according to the present embodiment are not limited to the aspects described above, and various modifications can be made.

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

In addition, the bending state of the wire bodies 12, 22, 32, 42 is maintained by the maintaining parts 16, 24b, 36, 46 so that the supporting parts 15, 24a, 35, 45 do not come off the wire bodies 12, 22, 32, 42. Alternatively, the wire bodies 12, 22, 32, 42 may be welded together to form an annular portion to maintain the curved state of the wire bodies 12, 22, 32, 42.

Moreover, it is not always necessary to attach the shock absorbing wires 10, 20, 30, 40 to all the struts 110. FIG. When the strength of the rockfall prevention system is guaranteed, the support 110 to which the shock absorbing wires 10, 20, 30, 40 are attached and the support 110 to which the shock absorbing wires 10, 20, 30, 40 are not attached are provided. Alternating rockfall protection systems may be used. Alternatively, the struts 110 to which the shock absorbing wires 10, 20, 30, 40 are attached and the struts 110 to which the shock absorbing wires 10, 20, 30, 40 are not attached are arranged differently from the above. A rockfall prevention system may be used.

As for the curved shape of the wire bodies 12, 22, 32, 42, the wire bodies 12, 22, 32, 42 are curved 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. Wire bodies 12, 22, 32, 42 curved upward and wire bodies 12, 22, 32, 42 curved downward are alternately arranged. may

It should be noted that the applications of the shock absorbing wires 10, 20, 30, and 40 described above 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. Also, by using the shock absorbing wires 10, 20, 30, and 40 as guardrails and median strips, the shock when a vehicle or the like collides may be absorbed. Also, the shock absorbing wires 10, 20, 30, 40 can be used in various other applications.

Moreover, as the shock absorbing wire according to this embodiment, the wires shown in the modified examples in FIGS. 11 to 15 may be used. 11 to 13 are drawings for explaining the configuration of the shock absorbing wire 70 according to the modification, and FIG. 14 is for explaining the configuration of the shock absorbing wire 80 according to another modification. FIG. 15 is a drawing for explaining the configuration of a shock absorbing wire 90 according to still another modification.

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 tubular member having a hollow portion. The wire fixing portions 74 are crimped in a state in which the ends of the wire main bodies 72 are inserted into both ends of the wire fixing portions 74, respectively, so that the wire main bodies 72 are prevented from coming off the wire fixing portions 74. . Both ends of a spring 76 that is wound a plurality of times so as to surround the wire fixing portion 74 are attached near both ends of the wire fixing portion 74 (see FIGS. 11 and 12).

Further, when the shock applied to the shock absorbing wire 70 is larger than the predetermined threshold value, the portion of the wire fixing portion 74 indicated by a two-dot chain line indicated by reference symbol C in FIG. It is designed to absorb the impact that is applied. 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, thereby absorbing the shock applied to the shock absorbing wire 70. . Thus, when the spring 76 is deformed in the longitudinal direction, the shock applied to the shock absorbing wire 70 is absorbed more efficiently.

The shock absorbing wire 80 shown in FIG. 14 has two wire bodies 82, and a wire fixing portion 84 consisting of a rod-shaped portion 84a and annular portions 84b formed at both ends of the rod-shaped portion 84a. . Each wire body 82 is folded back after being passed through each annular portion 84b of the wire fixing portion 84, and crimped by a cylindrical 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 positioned inside the eye portions formed at the ends of the wire bodies 82, respectively. 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 of the wire fixing portion 84 in the vicinity of both ends thereof (see FIG. 14).

Further, when the shock applied to the shock absorbing wire 80 is greater than the predetermined threshold value, the portion of the wire fixing portion 84 indicated by a two-dot chain line indicated by reference symbol C in FIG. It is designed to absorb the impact that is applied. Further, even after the wire fixing portion 84 is broken, the spring 86 wound around the wire fixing portion 84 deforms in the horizontal direction in FIG. 14, thereby absorbing the shock applied to the shock absorbing wire 80. ing. Thus, when the spring 86 is deformed in the longitudinal direction, the shock applied to the shock absorbing wire 80 is absorbed more efficiently.

The shock absorbing wire 90 shown in FIG. 15 has a wire body 92 and a wire fixing portion 94 for fixing the wire body 92 in a curved state. More specifically, the wire fixing portion 94 has a rod-shaped portion 94a and annular portions 94b formed at both ends of the rod-shaped portion 94a and through which the wire body 92 is passed. Note that the example shown in FIG. 15 does not have a curved support portion disposed inside the wire body 92 in a curved state, unlike the shock absorbing wire 10 and the like shown in FIG. 1 and the like. However, by providing extra length to the wire passed through the annular portion 94b of the wire fixing portion 94, the wire main body 92 can be maintained in a partially curved state. 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 of the wire fixing portion 94 near both ends (see FIG. 15).

Further, when the shock applied to the shock absorbing wire 90 is larger than the predetermined threshold value, the portion of the wire fixing portion 94 indicated by a two-dot chain line indicated by reference symbol C in FIG. It is designed to absorb the impact that is applied. Further, even after the wire fixing portion 94 is broken, the spring 96 wound around the wire fixing portion 94 deforms in the horizontal direction in FIG. 15, thereby absorbing the shock applied to the shock absorbing wire 90. ing. Thus, when the spring 96 is deformed in the longitudinal direction, the shock applied to the shock absorbing wire 90 is absorbed more efficiently.

10 shock absorbing wire 12 wire body 14 wire fixing portion 15 supporting portion 16 maintaining portion 16a through hole 17 connecting member 20 shock absorbing wire 22 wire main body 24 wire fixing portion 24a first portion 24b second portion 30 shock absorbing wire 32 wire main body 34 Wire fixing portion 35 Supporting portion 36 Maintaining portion 40 Shock absorbing wire 42 Wire main body 44 Wire fixing portion 45 Supporting portion 45a Opening 46 Maintaining portion 46a Rod-shaped portion 46b Annular portion 50 Shock absorbing wire 52 Wire main body 54 Tightening member 70 Shock absorbing wire 72 Wire Main body 74 Wire fixing part 76 Spring 80 Shock absorbing wire 82 Wire main body 84 Wire fixing part 84a Rod-shaped part 84b Annular part 86 Spring 88 Cylindrical member 90 Shock-absorbing wire 92 Wire main body 94 Wire fixing part 94a Rod-shaped part 94b Annular part 96 Spring 100 Falling rock prevention system 110 Strut 112 Base member 114 Hinge 120 Falling object receiving member 300 Slope

Claims (4)

A shock absorbing wire for absorbing shock,
It has a wire body and a wire fixing part for fixing the wire body in a curved state,
the wire fixing portion breaks when the magnitude of the shock applied to the shock absorbing wire is greater than a predetermined threshold ;
The wire fixing portion includes a curved support portion disposed inside the wire body in a curved state, and a maintenance portion for maintaining the curved state of the wire body so that the support portion does not come off the wire body. has
A shock absorbing wire, wherein the supporting portion and the maintaining portion are connected by a string-like connecting member, and the connecting member fixes the relative positional relationship between the supporting portion and the maintaining portion . 2. The shock absorbing wire according to claim 1 , wherein said retaining portion breaks when the magnitude of shock applied to said shock absorbing wire is greater than a predetermined threshold. 2. A plurality of types of wire fixing portions having different threshold values of magnitude of impact at which said wire fixing portion breaks when an impact is applied to said shock absorbing wire are arranged in series as said wire fixing portion. 3. The shock absorbing wire according to 2 above. a plurality of pillars arranged on the 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 body stretched between each of the posts and the slope on the mountain side, and a wire fixing part for fixing the wire body in a curved state, and the falling object is received by the falling object receiving member. a shock-absorbing wire in which the wire fixing portion breaks when the magnitude of the shock applied when it is applied is greater than a predetermined threshold;
with
The wire fixing portion includes a curved support portion disposed inside the wire body in a curved state, and a maintenance portion for maintaining the curved state of the wire body so that the support portion does not come off the wire body. has
A rockfall prevention system, wherein the support portion and the maintenance portion are connected by a string-like connection member, and the relative positional relationship between the support portion and the maintenance portion is fixed by the connection member .

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