JP2019085692A - Protective facilities and energy absorbing devices - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a protective facility such as a guard fence capable of widening the range of dispersion and absorption capacity of collision energy. Providing an energy absorbing device that can disperse collision energy and widen the range of absorption capacity. SOLUTION: The terminal columns (fixed portions) 20 arranged at both ends are provided with a plurality of network bodies 11, 121 to 125 having different energy absorption characteristics, and the plurality of network bodies 11, 121 to 125 are in series. A protective facility characterized in that a chained energy absorbing section 10 is configured by being connected to the terminal column (fixed section) 20 at both ends, and the chained energy absorbing section 10 is arranged between the terminal columns (fixed sections) 20 at both ends. [Selection diagram] Fig. 1

Description

  The present invention relates to protective facilities and energy absorbing devices.

There is a guard fence in one of the protection facilities, and a guard fence using a rope body such as a wire rope or a guard fence using a mesh body such as a wire mesh as a guard fence for holding an object in a predetermined area. Guard fences using both cords and nets are used.
Guard fences that use ropes and nets are, for example, guard fences installed on the slope side of roads and houses to be protected to protect roads and houses from falling rocks on slopes etc. There is a guard fence). A general rock fall protection fence is a structure that supports an upper member composed of a support, a wire rope, and a wire mesh with a concrete foundation, thereby receiving a fall from above the slope and preventing a disaster.
The prior art regarding such a rock fall protection fence is disclosed by patent document 1 and patent document 2. FIG.

JP, 2008-150867, A JP, 2014-122503, A

A conventional common rock fall protection fence is, as described above, provided with a wire mesh and a wire rope for a plurality of columns supported on a concrete foundation. A plurality of wire ropes are provided in multiple stages, and each wire rope is stretched laterally between the columns, and both ends of the wire rope are anchored to the columns. Therefore, impact energy in the case of falling rock or the like is transmitted to the support via the wire rope. Therefore, the support and the base portion supporting the support are required to have a strength sufficient to withstand the impact of falling rocks.
On the other hand, by providing the buffer member to the wire rope and absorbing the energy, etc., the energy transmitted to the support can be reduced, so that the specifications of the support and the foundation supporting the support can be suppressed. There is something that
The cushioning member basically absorbs energy by plastic deformation of the member and friction between the members, and therefore its shock absorbing ability depends on the characteristics of the selected member, and cushioning It was not easy to increase the range of abilities.

  An object of the present invention is to provide a protective facility such as a protective fence which can widen the range of dispersion and absorption capacity of collision energy. Another object of the present invention is to provide an energy absorbing device capable of widening the range of dispersion and absorption capacity of collision energy.

(Configuration 1)
A chained energy absorbing portion is constituted by connecting the plurality of net bodies in series by fixing parts disposed at both ends and a plurality of net bodies having different energy absorption characteristics, and disposed at both ends A protective facility characterized in that the chained energy absorbing portion is disposed between the fixed portions.

(Configuration 2)
The plurality of nets constituting the chained energy absorbing portion have a collision surface net and an energy transmission and absorption net disposed around the collision net, and the elongation rate or deformation rate of the energy transmission and absorption net The protection facility according to Configuration 1, wherein the elongation ratio or the deformation ratio of the collision surface network body is larger.

(Configuration 3)
The energy transmission and absorption net is formed of a plurality of nets, and the elongation and deformation rates of the nets constituting the energy transmission and absorption net become larger as the energy transmission and absorption net is separated from the collision surface net. Protective facility described in Configuration 2.

(Configuration 4)
The protection facility according to Configuration 2 or 3, wherein the collision surface network and the energy transmission and absorption network are provided at predetermined intervals.

(Configuration 5)
5. A protective facility according to any one of the configurations 2 to 4, further comprising a net body connected in parallel with an extra length to the energy transmission and absorption net body.

(Configuration 6)
The protection facility according to Configuration 5, wherein the elongation rate or deformation rate of the net bodies connected in parallel with the extra length is smaller than the elongation rate or deformation rate of the energy transmission and absorption net body. .

(Configuration 7)
A structure characterized in that the energy absorption characteristics of the mesh body are different because the structure of the mesh body is different, or because the wire diameter or the material strength of the strands constituting the mesh body are different. Protective facility according to any of 1 to 6.

(Configuration 8)
And a chained energy absorbing portion formed by forming a wire mesh using row lines having different energy absorption characteristics, and the chainwise between the fixed portions at the both ends, A protective facility characterized by an energy absorbing unit.

(Configuration 9)
The chained energy absorbing portion has a collision surface network portion and an energy transmission absorption portion, and the elongation rate of the row lines constituting the energy transmission absorption portion is the elongation of the row lines constituting the collision surface net portion 8. The protective facility according to arrangement 8, characterized in that it is greater than the rate.

(Configuration 10)
9. The protection facility according to configuration 9, wherein the elongation of the row lines forming the energy transfer absorption part increases continuously or intermittently as the distance from the collision surface net part increases.

(Configuration 11)
The protection facility according to the configuration 9 or 10, further comprising a net body connected in parallel with an extra length to the energy transfer absorption part.

(Configuration 12)
11. The protection facility according to configuration 11, wherein the elongation rate or deformation rate of the net bodies connected in parallel with the extra length is smaller than the elongation rate or deformation rate of the energy transmission / absorption portion.

(Configuration 13)
11. The protective facility according to any one of the configurations 1 to 12, further comprising an initial protective area holder that holds the protective area formed by the chained energy absorbers at an initial stage of collision of an impactor.

(Configuration 14)
What is claimed is: 1. An energy absorbing device comprising: a chain-like energy absorbing portion configured by connecting a plurality of net bodies having different energy absorbing characteristics in series with each other.

(Configuration 15)
The plurality of nets having different energy absorption characteristics include a first net and a plurality of nets having a larger elongation rate or deformation rate than the first net, and the nets are different than the first net. 15. The energy absorbing device according to Configuration 14, wherein the energy transmission and absorption network is constituted by a plurality of nets having a large elongation rate or deformation rate.

(Configuration 16)
The energy absorbing device according to Configuration 15, wherein the first mesh body and the energy transmission and absorption mesh body are provided at predetermined intervals.

(Configuration 17)
The network structure having a surplus length and being connected in parallel with at least a part of the plurality of net bodies constituting the energy transmission and absorption net body, the configuration 15 or The energy absorption device according to 16.

(Configuration 18)
The energy absorption as described in Configuration 17, wherein the elongation rate or deformation rate of the net bodies connected in parallel with the extra length is smaller than the elongation rate or deformation rate of the energy transmission and absorption net body. apparatus.

(Configuration 19)
What is claimed is: 1. An energy absorbing device comprising: a chain-like energy absorbing portion configured by forming a metal mesh using row lines having different energy absorbing characteristics.

(Configuration 20)
The chained energy absorbing portion comprises a first net body portion and an energy transmission absorbing portion;
The energy absorbing device according to Configuration 19, wherein the elongation of the column lines constituting the energy transfer absorption part is larger than the elongation of the column lines constituting the first mesh part.

(Configuration 21)
The energy absorbing device according to Configuration 20, wherein the elongation percentage of the row lines forming the energy transfer absorption portion increases continuously or intermittently as the distance from the first mesh portion increases.

(Composition 22)
The energy absorbing device according to Configuration 20 or 21, further comprising a net body connected in parallel with an extra length with respect to the energy transfer absorbing portion.

(Composition 23)
The energy absorbing device according to Configuration 22, wherein the elongation rate or deformation rate of the net bodies connected in parallel with the extra length is smaller than the elongation rate or deformation rate of the energy transmission absorption portion .

  According to the protection facility and the energy absorbing device of the present invention, a plurality of mesh bodies (buffer members) having different energy absorbing characteristics are connected in series to one another, or using row lines having different energy absorbing characteristics. By forming a wire mesh, by providing a structured chain energy absorbing portion, energy is transmitted and absorbed throughout the chained energy absorbing portion whose energy absorbing characteristics are different depending on the location, It is possible to widen the range of dispersion and absorption capacity.

The figure which shows the guard fence of embodiment concerning the present invention. A figure showing another example of a guard fence of an embodiment A figure showing another example of a guard fence of an embodiment A figure showing another example of a guard fence of an embodiment A conceptual diagram showing an example of parallel connection of nets with an extra length to an energy transmission and absorption net.

  Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings. In addition, the following embodiment is one form at the time of embodying this invention, Comprising: This invention is not limited within the range.

FIG. 1 is a schematic view showing a protective fence (protective facility) of Embodiment 1 according to the present invention, FIG. 1 (a) is a top view, and FIG. 1 (b) is a front view (however, from the viewpoint of viewability). , The figure which omits the description of wire mesh 30, etc.).
The guard fence 1 of the present embodiment is a rock fall guard fence provided on a slope side of a road or a house to be protected in order to protect a road, a house or the like from falling rocks on a sloped place or the like.
As shown in FIG. 1, the protective fence 1 includes a terminal support (fixing portion) 20 erected at both ends, a plurality of wire nets (nets) 121 to 125 having different energy absorption characteristics, and a wire net (nets) A chained energy absorbing portion 10 configured by connecting in series 11, a wire mesh 30 which is a face material stretched between the end columns 20, and between the end columns 20 on the upper end side and the lower end side of the wire mesh 30. And a cord (not particularly shown) to be stretched.

  The basic configuration of the protective fence 1 is that a chained energy absorbing portion 10 is stretched between the end columns 20 at both ends, and a wire mesh 30 is stretched on the front surface and the rear surface, respectively.

  The end post 20 is made of, for example, an H-shaped steel or the like, and is supported by a concrete foundation. The end post 20 may be directly set by concrete and installed, or a erected hole for receiving the end post 20 may be formed in the concrete foundation, the end post 20 is erected on this, and an L-shaped stay or the like may be used. In addition, it may be installed by fastening a bolt or the like embedded in the foundation and the terminal support 20. According to the latter construction method, replacement of the terminal support 20 becomes easy, and the maintainability is excellent.

In the present embodiment, the chain energy absorbing portion 10 is provided with a wire mesh 11 which is a collision surface net body at the central portion, and is provided with an energy transmission absorption net body 12 on both sides (periphery) thereof. The energy transmission and absorption network 12 has the same (symmetrical) configuration on both sides.
The energy transmission and absorption network 12 is constituted by wire nets 121 to 125 (a plurality of nets), and as the distance from the mesh 11 which is the collision surface netting, the elongation or the wire mesh of the metal nets 121 to 125 constituting the energy transmission and absorption network The deformation rate becomes larger. In addition, the wire mesh 11, which is the collision surface network, is formed to have the smallest elongation rate or deformation rate (the elongation rate or deformation rate of the energy transmission and absorption network is larger than the elongation rate or deformation rate of the collision surface network ).
That is, the elongation rate or the deformation rate is: wire mesh 11 <wire mesh 125 <wire mesh 124 <wire mesh 123 <wire mesh 122 <wire mesh 121.

In the present embodiment, the wire net 11 and the wire nets 121 to 125 are all diamond-shaped wire nets, and the wire net 11 and the wire nets 121 to 125 are identical in shape. That is, configurations such as wire diameter, mesh size, wire mesh angle, number of wire intersections per meter, thickness, etc. are the same.
On the other hand, the wire mesh 11 and the wire meshes 121 to 125 are different in the material of the row lines constituting each wire mesh, and the elongation rates of the row lines constituting each wire mesh are as follows: wire mesh 11 <wire mesh 125 <wire mesh 124 It is the wire mesh 122 <the wire mesh 121. As a result, the wire mesh 11 and the wire mesh 121 to 125 have different energy absorption characteristics, and as described above, the elongation rate or deformation rate is as follows: wire mesh 11 <wire mesh 125 <wire mesh 124 <wire mesh 123 <wire mesh 122 <wire mesh 121 <wire mesh 121, It is.
In the chained energy absorbing portion 10 of the present embodiment, each wire mesh 11 and the wire meshes 121 to 125 are formed as one integral wire mesh. That is, as described above, the row lines constituting each wire mesh 11 and the wire meshes 121 to 125 are different in material but have the same shape, and the chain energy absorbing portion 10 is formed by knitting the respective row lines. It is configured. Accordingly, the chain energy absorbing portion 10 is apparently formed as a single wire mesh (there is no separate connection member or the like for connecting each wire mesh). The chain-like energy absorbing portion 10 is a series of wire nets 11 and wire nets 121 to 125 connected in series, and is also a “wire net formed using row lines having different energy absorption characteristics”.
In addition, the fastening with the both ends (wire net 121) of the chain-like energy absorption part 10 and the terminal support | pillar 20 should just use the various fastening methods etc. which are used conventionally.

  A wire mesh 30 stretched between the end columns 20 is provided on the front side and the rear side of the guard fence 1 as shown in FIG. 1 (a). Further, on the upper end side and the lower end side of the wire mesh 30, cords (wire ropes) are stretched between the terminal columns 20. By fastening the upper end and the lower end of the wire mesh 30 to the cord body, the shape (spread as a surface: protective area) of the wire mesh is maintained even at the time of a collision of falling rock or the like.

By having the above configuration, the protective fence 1 of the present embodiment allows collision energy to propagate and be absorbed over the entire chain energy absorbing portion 10 at the time of a collision such as falling rock, so that the barrier energy 1 in the chain energy absorbing portion 10 The energy absorption efficiency is very excellent, and it becomes possible to widen the range of dispersion and absorption capacity of collision energy.
In this regard, the concept of energy absorption at the time of a rock fall collision of the guard fence 1 of the present embodiment will be described. The guard fence 1 is installed so that falling rock or the like basically collides with a wire mesh 11 which is a collision surface net body (or a collision surface net portion), as assumed at the time of its installation.
In the wire mesh 11 in which the falling rock collides, the momentary large impact caused by the collision causes a large deformation near the colliding portion of the falling rock, and a large amount of energy is absorbed by the large deformation. That is, deformation occurs due to structural deformation (such as deformation of the mesh) of the wire mesh or elongation of the wire itself that constitutes the wire mesh, and energy is consumed due to plastic deformation or friction between members at this time. Collision energy is absorbed by
On the other hand, the collision energy that can not be absorbed here is propagated from the center to the periphery of the collision. Since the propagation of the collision energy is propagated through each metal mesh, energy absorption is also performed as needed during the propagation process. Thus, the further to the periphery, the less energy is transmitted.
Here, in the protection fence 1 of the present embodiment, the energy absorption characteristics of the wire mesh 11 and the wire mesh 121 to 125 constituting the chained energy absorbing portion 10 are different, and the elongation rate or deformation rate increases toward the peripheral portion. Is configured as. Therefore, it can be said that the chain energy absorbing portion 10 has a distribution of energy absorbing characteristics according to the magnitude of the collision energy to be transmitted. As a result, the chained energy absorbing portion 10 can efficiently absorb collision energy by the whole, and it is also possible to widen the range of dispersion and absorption capacity of collision energy.
According to the chained energy absorbing portion 10 of the present embodiment, since the collision energy can be efficiently absorbed in the whole, the propagation of the collision energy to the terminal support 20 is suppressed as much as possible. It is also possible to construct the column and the foundation to support it relatively inexpensively.

In the present embodiment, the chained energy absorbing unit 10 is an example formed as an integral wire mesh by weaving row lines that constitute the respective wire nets (wire mesh 11, wire nets 121 to 125). Bonding of the wire mesh (wire mesh 11, wire mesh 121 to 125) may use various bonding methods. An example of such is shown in FIG.
The guard fence 1 'shown in FIG. 2 is an example in which the connector 13 is used in joining the respective wire nets (the wire net 11, the wire nets 121 to 125). As shown in the figure, a connector 13 is disposed at the end of each wire mesh, and the ends of the wire meshes 121 to 125 are fastened to the connector 13 using, for example, a coil (not shown). In addition, the connection tool 13 may use a wire rope, a rod-like member (flat steel, round steel, or the like) or the like.
As in the present embodiment, by forming them as an integral wire mesh, joining of each wire mesh (wire mesh 11, wire mesh 121 to 125) is seamlessly performed, and junction energy propagation of each wire mesh is uniformly performed, or There are advantages such as ease of construction on site.
On the other hand, as shown in the example of FIG. 2, when joining each wire mesh using a connector, the structure of each wire mesh may be different. It can be formed by the difference in size (size of wire, diameter of wire, etc.). Further, when there is a rock fall collision, it is possible to replace only the necessary wire mesh (a wire mesh having a large breakage or plastic deformation) among the respective wire nets (wire mesh 11, wire meshes 121 to 125).

In the present embodiment, an example in which the wire mesh 30 is stretched on the front surface and the rear surface of the chain energy absorbing portion 10 is taken as an example between the end columns 20 at both ends.
Basically, the wire mesh 30 is used as an initial protection area holding section for holding the protection area (the spread as a surface for receiving the falling rocks) of the chain energy absorbing section 10 at the initial stage of the collision of the falling object (collision object). It is provided.
Simply by stretching the chain energy absorbing portion 10, if the falling rock collides with the vicinity of the upper end or the lower end of the chain energy absorbing portion 10, the falling energy passes through the chain energy absorbing portion 10 so that the rock falls. There is a risk of The wire mesh 30 is provided to suppress the occurrence of such "turn over". The wire mesh 30 maintains the protection area of the chain energy absorbing portion 10 at the early stage of the rock fall collision, and catches the rock falling at the chain energy absorbing portion 10 (shape is such that the chain energy absorbing portion 10 wraps the rock falling Make sure that Once the falling energy has been caught in the chain energy absorbing portion 10, there is little possibility that the rock falling will pass through the chain energy absorbing portion 10 thereafter.
In addition, elongation also occurs in the wire mesh 30 and a rope (not shown) that holds the wire mesh, and collision energy is absorbed also by these, but it is essential that only the chain energy absorbing portion 10 is However, the impact energy absorption efficiency is high. If there is a rope or the like for holding the wire mesh 30, collision energy is transmitted to the terminal support by this rope, and the energy absorption efficiency in the chain energy absorbing unit 10 is lowered. Therefore, the wire mesh 30 and the cords that hold the wire mesh need only exhibit their function at the “early stage of rock fall collision”, and eventually break up (breaks when assumed rock energy is added) A strong cord)) (which is preferable).

FIG. 3 shows a protective fence 1 ′ ′ provided with an upper wire mesh 41 and a lower wire mesh 42 as another example of the initial protective area holding portion.
The guard fence 1 ′ ′ of FIG. 3 has the upper wire mesh 41 and the lower wire mesh 42 near the upper end portion and the lower end portion of the chain energy absorbing portion 10 instead of the wire mesh 30 in the embodiment. It was between twenty. Thereby, the occurrence of "turning up" in the vicinity of the upper end portion and the lower end portion of the chain energy absorbing portion 10 is suppressed, and the falling of the rock falling in the chain energy absorbing portion 10 (the chain energy absorbing portion 10 wraps the rock falling Such as to be made more secure.
The upper wire mesh 41 and the lower wire mesh 42 may be formed separately from the chain energy absorber 10 and attached to the chain energy absorber 10 using a coil or the like. The upper wire mesh 41 and the lower wire mesh 42 may be configured to increase in elongation rate and deformation rate as they go to the peripheral portion, as in the case of the chain energy absorbing unit 10. Further, the upper wire mesh 41 and the lower wire mesh 42 may be formed by folding the upper end portion and the lower end portion of the chain energy absorbing portion 10, for example.

FIG. 4 shows a protective fence 1 ′ ′ ′ provided with an upper cord 51 and a lower cord 52 as yet another example of the initial protective area holder.
The guard fence 1 ′ ′ ′ shown in FIG. 4 includes an upper rope 51 (wire rope) and a lower rope (near the upper end and the lower end respectively of the chain energy absorbing portion 10) instead of the wire mesh 30 in the embodiment. A wire rope 52 is stretched between the end columns 20 at both ends, and these are connected to the chain energy absorbing portion 10 using a coil c. In the example here, the upper member for holding the upper cord 51 is used as an example. The upper member includes an upper support 61 provided on the terminal support 20, a cable (wire rope) 62 stretched between the upper support 61, and a cable (a cable (wire) for suspending the upper cable 51 from the cable 62. And 63).
Thereby, the occurrence of "turning up" in the vicinity of the upper end portion and the lower end portion of the chain energy absorbing portion 10 is suppressed, and the falling of the rock falling in the chain energy absorbing portion 10 (the chain energy absorbing portion 10 wraps the rock falling Such as to be made more secure.
As described above, the propagation of collision energy to the terminal support 20 by the upper cord 51 and the lower cord 52 is not preferable. Therefore, in order to suppress this, the fastening by the coil c may be one that is eventually broken or the like (a coil of strength that is broken when the assumed rock energy is added) Is preferred).

In the embodiment, as the configuration of the chain energy absorbing portion, an example is provided in which the collision surface network is provided at the central portion, and the energy transmission and absorption network has the same configuration (right and left symmetry) on both sides. However, they may be different on both sides.
Also, the energy transmission and absorption net may be provided not only in the lateral direction of the collision surface net, but also in the vertical direction of the collision face net. Also in the case of such two-dimensional arrangement and bonding, it corresponds to "a plurality of nets are connected in series" in the present invention.
In addition, the number of energy transmission and absorption nets provided between the terminal support (fixed portion) may be arbitrarily set. For example, the collision surface network and the energy transmission and absorption network may be alternately and repeatedly connected in series. When a plurality of energy transmission and absorption nets are provided as described above, the energy transmission and absorption nets may be provided at predetermined intervals. If the installation position of the energy transmission and absorption net is uneven, there is a risk that the energy absorption effect of the energy transmission and absorption net may be reduced if there is a rockfall at a distant position from here. By providing it, it is possible to obtain a predetermined energy absorption effect by the energy transmission and absorption network regardless of the position of the collision of the falling rock against the guard fence.

Note that the energy transmission and absorption net may be provided with a net having a surplus length and connected in parallel.
FIG. 5 is a conceptual view (a conceptual view as viewed from the top) showing an example of such a net having a surplus length and connected in parallel. In the example shown in FIG. 5, an energy transmission / absorptive mesh 12 '(wire mesh 121'-125') is provided so as to short-cut a predetermined range of the wire mesh 11 'which is the collision surface mesh, whereby the wire mesh 11' It is configured to be connected in parallel with an extra length in the range. With this configuration, even if breakage occurs in the energy transmission and absorption net 12 ', the necessary strength is secured by the wire mesh 11'.
In the configuration, it is preferable that the elongation rate or deformation rate of the net bodies connected in parallel with an extra length be smaller than the elongation rate or deformation rate of the energy transmission and absorption net body.
Here, although an example in which the mesh body 11 'is connected in parallel to the whole of the energy transmission and absorption mesh body 12' (wire mesh 121 'to 125') is taken as an example, the present invention is not limited thereto. For example, wire nets may be connected in parallel to each of the wire nets 121 'to 125'.
Further, although the wire nets connected in parallel are the net (collision surface net) 11 'here, a wire net different from the net 11' may be connected.
In addition, a plurality of wire nets connected in parallel may be provided.

  In the embodiment, the chained energy absorbing portion has an example in which the energy absorbing property changes (that is, the energy absorbing property changes stepwise) in wire mesh units, but the present invention is not limited to this. Instead, the energy absorption characteristic may be changed in units of row lines (that is, the energy absorption characteristic may be changed continuously).

In the embodiment, as the configuration of the chain energy absorbing portion, a collision surface net body is provided at the central portion, and the energy propagation absorbing net has a similar configuration (right and left symmetry) on both sides thereof as an example. As an example, the elongation rate and the deformation rate increase as going from the point to the periphery, but the order of combinations of nets (or column lines) having different energy absorption characteristics is not limited to this.
For example, even if the distribution of energy absorption characteristics (the order of combinations of networks (or row lines) having different energy absorption characteristics) is arbitrary, the chain energy absorption portion has such energy absorption characteristics By having different parts, it is possible to widen the range of the absorbing ability of the collision energy.
However, as described in the embodiment, as described above, by setting the chain energy absorbing portion as “the elongation rate and the deformation rate increase as going from the location where collision of an impact object is assumed to the peripheral portion”, It is possible to form a distribution of energy absorption characteristics according to the magnitude of the collision energy transmitted at the time of a rock fall collision, which is preferable.

In the embodiment, a rhombus wire mesh is used as an example of the net, but nets of various structures can be used.
In the embodiment, the wire mesh 30 is provided as the initial protection area holding portion as an example, and as another example, the upper wire mesh 41 and the lower wire mesh 42 (FIG. 3), the upper cord 51 and the lower cord 52 (figure Although 4) is shown, for example, when there is a low possibility of the occurrence of "turning up" in the chain energy absorbing portion 10 due to a short distance between the terminal support, etc., the initial protective area holding portion is not provided. It does not matter.

In the embodiment, the “chained energy absorbing part” which is the concept of the present invention is described as an example applied to a guard fence (an example as a protective facility), but the “chained energy absorbing part” of the present invention is It can be applied to a wider range of applications. That is, the "chained energy absorbing part" of the present invention can be used for each application as a facing material (energy absorbing device) having an excellent energy absorption efficiency as described above.
For example, the chain-like energy absorbing portion 10 described in the embodiment may be used as a rock fall protection network for slopes (to prevent weathered and fragile dew rocks scattered on slopes and rolling stones on roads, etc. It can also be used as a wire mesh. It can also be used for pocket-type rockfall protection networks. The use of chained energy absorbers in these other protective facilities (such as slope fall protection nets and pocket type fall fall protection nets) merely replaces the traditional wire mesh with chained energy absorbers. In order to make more efficient use of the chained energy absorption function, each protective facility defines a point at which a collision object is expected to collide, and there is a “collision surface network” there. , And may be designed to arrange an “energy transmission and absorption network” between the periphery and the fixed part (fixed part for installation of each protective facility).
The application destination of the “chained energy absorbing part”, which is the concept of the present invention, is not limited to a protective facility, but may be applied to various applications (in many scenes where facing materials such as wire mesh are used or as energy absorbing devices Applications). When used as an energy absorbing device, any combination of a first mesh and a plurality of meshes having a greater elongation or deformation rate than the first mesh in series may be used, and combinations thereof May be arbitrary (the one that determines the arrangement of each wire mesh etc. appropriately according to the application). Also, as described above, at least a part of the plurality of nets constituting the energy transmission and absorption net is provided with the nets connected in parallel with an extra length, etc. You may

1. . . Guard fence (guard facility)
10. . . Chained energy absorbing part 11. . . Collision surface network 12. . . Energy transmission and absorption network 121-125. . . Wire mesh (mesh)
20. . . Terminal post (fixed part)
30. . . Wire mesh (initial protection area holder)

Claims (23)

Fixed parts disposed at both ends,
Multiple nets with different energy absorption characteristics,
Equipped with
By connecting the plurality of nets in series, a chain energy absorbing portion is constituted,
A protective facility characterized in that the chained energy absorbing portion is disposed between the fixing portions disposed at both ends. A plurality of net bodies constituting the chained energy absorbing portion are
A collision surface network and an energy transmission and absorption network disposed around the collision surface network;
The protective facility according to claim 1, wherein the elongation rate or deformation rate of the energy transmission and absorption network is larger than the elongation rate or deformation rate of the collision surface network.   The energy transmission and absorption net is formed of a plurality of nets, and the elongation and deformation rates of the nets constituting the energy transmission and absorption net become larger as the energy transmission and absorption net is separated from the collision surface net. The protective facility according to claim 2.   The protective facility according to claim 2 or 3, wherein the collision surface network and the energy transmission and absorption network are provided at predetermined intervals.   The protection facility according to any one of claims 2 to 4, further comprising a net body connected in parallel with an extra length to the energy transmission and absorption net body.   The protection according to claim 5, wherein the elongation rate or deformation rate of the net bodies connected in parallel with the extra length is smaller than the elongation rate or deformation rate of the energy transmission and absorption net body. Facility.   The energy absorption characteristics of the mesh body are different because the structure of the mesh body is different, or because the wire diameter or the material strength of the strands constituting the mesh body is different. The protection facility according to any one of Items 1 to 6. Fixed parts disposed at both ends,
Chained energy absorbing parts configured by forming a wire mesh using row lines having different energy absorption characteristics,
Equipped with
A protective facility characterized in that the chained energy absorbing portion is disposed between the fixed portions at both ends. The chained energy absorbing portion has a collision surface net portion and an energy transmission absorbing portion,
9. The protective facility according to claim 8, wherein the elongation of the row lines constituting the energy transfer absorption part is larger than the elongation of the column lines constituting the collision surface net part.   The protective facility according to claim 9, characterized in that the elongation rate of the row lines constituting the energy transmission / absorption portion increases continuously or intermittently as the distance from the collision surface net portion increases.   The protection facility according to claim 9 or 10, further comprising: a net body connected in parallel with an extra length to the energy transfer absorption part.   The protection facility according to claim 11, wherein the elongation rate or deformation rate of the net bodies connected in parallel with the extra length is smaller than the elongation rate or deformation rate of the energy transfer absorption portion. .   The protective facility according to any one of claims 1 to 12, further comprising an initial protective area holder for holding the protective area formed by the chain energy absorber at an initial stage of collision of an impactor.   What is claimed is: 1. An energy absorbing device comprising: a chain-like energy absorbing portion configured by connecting a plurality of net bodies having different energy absorbing characteristics in series with each other. The plurality of nets having different energy absorption characteristics include a first net, and a plurality of nets having a larger elongation rate or deformation rate than the first net,
15. The energy absorbing device according to claim 14, wherein the energy transmission and absorption network is constituted by a plurality of networks having a greater elongation rate or deformation rate than the first network.   The energy absorbing device according to claim 15, wherein the first mesh body and the energy transmission and absorption mesh body are provided at predetermined intervals.   The network according to claim 15, further comprising a net body connected in parallel with an extra length to at least a part of the net bodies of the plurality of net bodies constituting the energy transfer absorption net body. Or the energy absorption device as described in 16.   The energy according to claim 17, wherein the elongation rate or deformation rate of the net bodies connected in parallel with the extra length is smaller than the elongation rate or deformation rate of the energy transmission and absorption net body. Absorber.   What is claimed is: 1. An energy absorbing device comprising: a chain-like energy absorbing portion configured by forming a metal mesh using row lines having different energy absorbing characteristics. The chained energy absorbing portion comprises a first net body portion and an energy transmission absorbing portion;
20. The energy absorbing device according to claim 19, wherein the elongation of the column lines constituting the energy transfer absorption part is larger than the elongation of the column lines constituting the first mesh part.   21. The energy absorbing device according to claim 20, wherein the elongation of the row lines constituting the energy transfer absorbing portion increases continuously or intermittently as the distance from the first mesh portion increases.   22. The energy absorbing device according to claim 20, further comprising a net body connected in parallel with an extra length with respect to the energy transfer absorbing portion.   The energy absorption according to claim 22, wherein the elongation rate or deformation rate of the net bodies connected in parallel with the extra length is smaller than the elongation rate or deformation rate of the energy transmission absorption portion. apparatus.

Images