JP2011231612A - Damper device and energy absorbing body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively absorb energy acting on a pressure-receiving face of a guard net while avoiding the breakage of a damper device.SOLUTION: The damper device comprises: a first axial force absorbing body 10 fixed at its base end and erected in a tiltable manner; a second axial force absorbing body 20 intersecting the first axial force absorbing body 10, and fixed at its base end and erected in a tiltable manner; a first connection material 31 connecting a free end of the first axial force absorbing body 10 to a free end of the second axial force absorbing body 20; a second connection material 32 connecting the free end of the first axial force absorbing body 10 to the base end of the second axial force absorbing body 20; and an anchor 56 anchoring the base end of the first axial force absorbing body 10. Any one of the first and second axial force absorbing bodies 10 and 20 is constituted of a plurality of curved flexible materials, and the other one of the first and second axial force absorbing bodies 10 and 20 is constituted of a rigid material.

Description

  The present invention relates to an energy absorption technique suitable for absorbing dynamic loads such as falling rocks and avalanches and static loads such as snow pressure (hereinafter referred to as “energy”), and more particularly a damper that absorbs energy acting on a protective net. The present invention relates to an apparatus and an energy absorber.

Shock absorbers such as rockfall protection fences and avalanche protection fences, in which a protection net is installed between columns that are erected on a slope or the like, are well known.
This type of shock absorber has a structure in which the energy acting on the protective net is finally supported by the strength of the struts and the anchor strength of a plurality of stay ropes connected to the struts.

Patent Document 1 discloses an avalanche protective fence in which the number of holding ropes and anchors for supporting the tilting of the support column is reduced.
The avalanche protection fence of Patent Document 1 is composed of a ground anchor, a support structure, and a protection net, and the support structure is composed of a main support, an oblique support, and a plurality of rope members. The diagonal struts are arranged so as to cross diagonally, and the base ends of the diagonal struts are fixed to the slope with ground anchors.
The free ends and the base ends of both struts are connected by rope materials so that the snow load received by the protective net is compressed to both struts and transmitted as tension to the rope material as a retaining material.

  The protective fence described in Patent Document 1 has an advantage that the snow load acting on the protective net is countered by the compression strength of both struts and the tension of the rope material, and the installation of the holding rope and the anchor can be omitted.

JP 2007-63831 A

The avalanche protective fence described in Patent Document 1 has the following problems.
(1) Although the main strut and the oblique strut have a strength sufficient to withstand compression, the strut itself does not have a load absorbing function.
Therefore, when an axial force exceeding the assumption is applied to the main support column and the oblique support column, the support column suddenly buckles and breaks.
(2) The base ends of the main strut and the slant strut constituting the strut structure are allowed to pivot along the slope inclination direction but are supported in a state where the rotation in the direction perpendicular to the slope inclination direction is restricted. is doing.
Therefore, a tilting force acts in the approaching direction with respect to adjacent strut structures when a snow load is applied, and the shaft support locations at the base ends of the main strut and the oblique strut are deformed and broken.
(3) When a load acts on the protective fence at high speed, such as an avalanche or falling rock, or local load, not only compression but bending and twisting are applied to each support.
The strut structure cannot cope with bending or twisting, and the stability balance of the strut structure is likely to be lost. If the stable balance is lost, there is a risk that the strut structure is suddenly broken.
(4) If some of the columns of the plurality of column structures constituting the protective fence are destroyed, the destruction spreads in a chain and loses the function of the entire protective fence.
(5) The destroyed strut structure needs to be removed and replaced with a new strut, but replacing the strut requires a lot of time, labor and cost.
(6) A high-strength concrete-filled steel pipe is used for each column on which compression acts, and a high-strength PC steel material of a rope material on which tension acts.
For this reason, not only the cost of manufacturing the column structure is high, but also the column is heavy and the workability of carrying in and assembling to the site is deteriorated.

The present invention has been made in view of the above points, and an object of the present invention is to provide at least one damper device and energy absorber.
<1> To efficiently absorb energy acting on the pressure-receiving surface of the protective net while avoiding the destruction of the damper device.
<2> Even if a three-dimensional external force such as bending or twisting is applied to the damper device, it is converted into an axial force and absorbed.
<3> Excellent compatibility with not only static loads such as snow pressure, but also dynamic loads such as falling rocks and avalanches.
<4> The damper device has a self-restoring property and is excellent in the restorability of the energy absorber.
<5> To reduce the material cost and construction cost of the energy absorber.

1st invention of this application is a damper device which has both a damper function and a support | pillar function, Comprising: The 1st axial force absorber which fixedly arranged the base end and stood up freely, and said 1st axial force absorber And a second axial force absorber that is tilted with a base end fixed, a free end of the first axial force absorber, and a free end of the second axial force absorber A first connecting member for connecting the first axial force absorber, and a second connecting member for connecting a free end of the first axial force absorber and a proximal end of the second axial force absorber, Alternatively, either one of the second axial force absorbers is constituted by a plurality of bending materials, and either one of the first or second axial force absorbers is constituted by a rigid material. .
According to a second invention of the present application, in the first invention, both end portions of the plurality of bending materials are converged, and an intermediate portion of the plurality of bending materials is curved inward or outward. It is characterized by.
A third invention of the present application is characterized in that, in the second invention, the bending material is folded back so as to have continuity, and both end portions of the first or second axial force absorber are converged.
A fourth invention of the present application is characterized in that, in the second invention, the end portions of each bending material are pin-coupled to converge both end portions of the first or second axial force absorber.
According to a fifth aspect of the present invention, in any one of the first to fourth aspects, an anchor for fixing a proximal end of the first axial force absorber is provided.
A sixth invention of the present application is the fifth invention, comprising a third connecting member that connects the base end of the first axial force absorber and the base end of the second axial force absorber. It is characterized by.
A seventh invention of the present application is characterized in that, in any one of the first to fifth inventions, a separate anchor for fixing the proximal end of the second axial force absorber is provided.
According to an eighth aspect of the present invention, in any one of the first to fifth aspects, a common pressure receiving plate is provided between the base end of the first axial force absorber and the base end of the second axial force absorber. It is connected.
A ninth invention of the present application is the free end of the second axial force absorber according to any one of the first to eighth inventions, wherein a retaining rope is provided on the other side (slope mountain side) of the first connecting member. It is connected.

According to a tenth aspect of the present invention, there is provided an energy absorber having a pressure receiving surface on the front surface of the protective net, wherein the damper devices according to any one of the first to ninth aspects are erected at intervals, and the adjacent dampers The upper edge of the protective net is attached to the free end side of the second axial force absorber of the device.
According to an eleventh aspect of the present invention, in the eighth aspect, any one or both of the first and second axial force absorbers generates an axial force generated by energy acting on the pressure receiving surface. It is characterized in that it is elastically deformed and absorbed while maintaining the above.

  “Energy” in the present invention includes not only dynamic loads such as falling rocks and avalanches but also kinetic energy and potential energy due to static loads such as snow pressure.

  The “elastic deformation” in the present invention includes compression deformation in the longitudinal direction of each axial force absorber, torsional deformation with the longitudinal direction as an axis, and bending deformation in all other directions.

According to the present invention, at least one of the following effects can be obtained.
(1) By constituting the axial force absorber with a plurality of curved bending members, the axial force generated in the axial force absorber can be elastically deformed and absorbed while maintaining the uprightness of the axial force absorber. it can.
Therefore, it is possible to efficiently absorb the energy acting on the pressure receiving surface of the protective net while avoiding the destruction of the first and second axial force absorbers constituting the damper device.
(2) Since the axial force absorber constituting the damper device can be elastically deformed in all directions, it can flexibly follow deformation and torsion caused by a load from an unexpected direction. it can.
Accordingly, sufficient energy absorption performance can be exhibited not only for static loads such as snow cover but also for dynamic loads such as falling rocks and avalanches.
(3) The loss of function of the energy absorber can be avoided because the first and second axial force absorbers do not suddenly break down as in the conventional strut structure made of a rigid material.
(4) Since the axial force absorber has a buffer function, the tension load and anchor strength of each connecting member can be reduced as compared with the conventional case.
Therefore, the structural member of the damper device can be simplified, and the manufacturing cost can be greatly reduced.
(5) After the load factor is removed from the pressure-receiving surface (removal of falling rocks, melting of snow, etc.), the damper device returns to its original shape and position by the self-restoring force of the axial force absorber. In addition to being able to suppress as much as possible, the function of the energy absorber can be maintained while maintaining the state before the action of energy.
(6) Since the axial force absorber that constitutes the damper device is composed of a plurality of bent materials, the transportability of the damper device to the site and the assembly workability are improved.
(7) By supporting the free end of the second axial force absorber with a holding rope, the damper device can be prevented from inadvertently falling over.

Perspective view of energy absorber with a part omitted Model diagram of damper device according to Reference Example 1 Enlarged view of the proximal end of the first axial force absorber Enlarged view of the free end of the first axial force absorber Enlarged view of the proximal end of the second axial force absorber Plan view of the free end of the second axial force absorber Model diagram of energy absorber during energy action Model diagram of damper device according to Reference Example 2 Model diagram of another damper device according to Reference Example 2 Model diagram of energy absorber according to example 3 Model diagram of other energy absorbers according to Example 3

  Embodiments of the present invention will be described below with reference to the drawings.

[Reference Example 1]
<1> Energy Absorber FIG. 1 shows a perspective view of the energy absorber A, and FIG. 2 shows a model diagram thereof.
The energy absorber A is composed of a plurality of damper devices B provided on a slope or the like at intervals, and a protective net C installed between the damper devices B.
The damper device B is inclined by one anchor 56.
The protective net C forms a pressure receiving surface C1 on the front surface.

<2> Damper Device Damper device B is a device that has both a damper function and a strut function, which disperses energy acting on pressure receiving surface C1 and absorbs it by converting it into axial force. One axial force absorber 10, a second axial force absorber 20 erected so as to intersect with the first axial force absorber 10, and the free end and the base end of each axial force absorber 10, 20 A first connecting member 31, a second connecting member 32, and a third connecting member 33.

The energy absorber A is configured to transmit the energy received by the protective net C as an axial force to the first and second axial force absorbers 10 and 20 and as a tensile force to the connecting members 31 and 32 which are reserve materials. The axial force acting on the first and second axial force absorbers 10, 20 is absorbed by compressing and deforming the axial force absorbers 10, 20 while maintaining the uprightness.
Hereinafter, the damper device B will be described in detail.

<3> First Axial Force Absorber The first axial force absorber 10 is an elastic structure having a buffer function that absorbs energy acting on the pressure-receiving surface C1 by compressive deformation, and a plurality of curved bending materials 11. Consists of.
Both ends of the plurality of bending materials 11 are converged, and an intermediate portion between the both ends of the plurality of bending materials 11 is outside so as to allow compressive deformation in the diameter increasing direction or the diameter reducing direction. It is curved in advance toward the inside and the inside.

  In this example, the “converged form” means that the end portions of the plurality of bending materials 11 are unrotatable in addition to the state in which the end portions of the plurality of bending materials 11 are rotatably coupled to each other. Includes bundled state.

The reason why the intermediate portion of the bending material 11 is curved in advance is that the bending direction of the bending material 11 is aligned in the same direction when the axial force is applied, and the uprightness of the first axial force absorber 10 is maintained. This is to allow compression deformation.
In other words, each bending material 11 is uniformly compressed and deformed at the time of compressive deformation, the first axial force absorber 10 does not meander, and the heel is linear at the center of the first axial force absorber 10. This is because, as if the guide shaft exists, it is compressed and deformed while maintaining linearity as a whole.

  In this example, the intermediate part of each bending material 11 is bent outward in advance, and the case where it is compressed and deformed in the diameter increasing direction by forming it larger than the end diameter is described. Of course, it is also possible to adopt a configuration in which the intermediate portion of 11 is bent inward in advance and formed to have a smaller diameter than the end diameter, thereby compressively deforming in the direction of diameter reduction.

Further, in this example, a description will be given of the case where the upper and lower bending members 11 are configured by two upper and lower bending members 11 and 11. However, the upper and lower bending members 11 may be arranged in an appropriate number. In addition to the same number of combinations, the number of arrangements may be different from each other.
For example, a metal material such as steel rope or spring steel, or an elastic material such as resin or rubber can be applied as the material of the bending material 11, and the shape such as a rod shape or a plate shape can be applied.
In short, what is necessary is just to have the intensity | strength which does not exceed an elastic limit with the axial force which arises in the 1st, 2nd axial force absorbers 10 and 20. FIG.

<3.1> Structure on the proximal end side of the first axial force absorber As shown in FIG. 3, the proximal end of the first axial force absorber 10 has a plurality of bending materials 11 bound together to receive pressure. Supported by the plate 50.
In this example, the bent portion of the bending material 11 is formed in a loop shape, and the connection pin 51 is inserted into the support bracket 52 formed on the pressure receiving plate 50 and the loop portion of the bending material 11 so as to be pivotally connected. Indicates.

The pressure receiving plate 50 is a plate for distributing and transmitting the axial force acting on the first axial force absorber 10 to the ground, and anchor pins 56 are placed in the anchor holes 53 and fixed to the slope.
In the figure, reference numerals 54 and 55 denote connection holes for attaching the connection end of the third connecting member 33 and the lower edge of the protective net B, respectively.

<3.2> Structure of Free End of First Axial Force Absorber As shown in FIG. 4, the free end of the first axial force absorber 10 is connected to a plurality of bending materials 11. A relay plate 58 is attached via a pin 57.
In this example, a case where the connecting plate 51 is inserted into the loop portion of the bending material 11 formed in a loop shape and the center of the relay plate 58 and the relay plate 58 is attached will be described.
The connection ends of the first and second connecting members 31 and 32 are rotatably connected to the upper and lower portions of the relay plate 58 through holes 58a and 58b, respectively.

  The relay plate 58 is a member that converts the tension generated in the first and second connecting members 31 and 32 into an axial force and transmits it to the free end of the first axial force absorber 10, but omits the relay plate 58. The connection ends of the first and second connecting members 31 and 32 may be directly connected to the free end of the first axial force absorber 10.

<4> Second Axial Force Absorber The second axial force absorber 20 is an elastic structure having a buffer function that absorbs energy acting on the pressure-receiving surface C <b> 1 by compressive deformation, and includes a plurality of bending materials 21. .
Both ends of the plurality of bending materials 21 are in a converged form, and an intermediate portion between the both ends of the plurality of bending materials 21 is outside so as to allow compressive deformation in the diameter increasing direction or the diameter reducing direction. Curved inward and inward.

The intermediate portions of the plurality of bending materials 21 are curved in advance in order to align the bending direction of the bending material 21 in the same direction when the axial force is applied, as in the case of the first axial force absorber 10 described above. This is to allow compressive deformation while maintaining the uprightness of the second axial force absorber 20.
Further, the bending directions and materials of the plurality of bending materials 21 are the same as those of the first axial force absorber 10 described above, and thus the description thereof is omitted.

  Although this example demonstrates the case where it comprises with the four bending materials 21 arrange | positioned vertically, the arrangement | positioning number of the bending materials 21 may be appropriate.

<4.1> Structure of the base end of the second axial force absorber FIG. 5 is a horizontal sectional view of the base end portion of the second axial force absorber 20.
The base end of the second axial force absorber 20 is rotatable with respect to the pressure receiving plate 60 while the bending material 21 is bound.
In this example, a case is shown in which a loop is formed at the lower end of the bending material 21, and a connection pin 61 is inserted into the support bracket 62 formed on the pressure receiving plate 60 and the loop of the bending material 21 to perform pin connection.

The pressure receiving plate 60 is a plate for distributing and transmitting the axial force acting on the second axial force absorber 20 to the ground, and is simply fixed to the slope and not fixed with a pin.
In the figure, reference numerals 63 and 64 denote connection holes for attaching the connection ends of the second and third connecting members 32 and 33, respectively.

<4.2> Structure of Free End of Second Axial Force Absorber As shown in FIG. 6, the free end of the second axial force absorber 20 has a plurality of flexures 21 bound together and connected It is attached to the converging plate 70 via a pin 71.
In this example, a case is shown in which a loop is formed at the upper end of the bending material 21, and a connection pin 71 is inserted into the support bracket 72 formed on the converging plate 70 and the loop of the bending material 21 to connect the pins.

The converging plate 70 is a member that converts the tension generated in the protective net C and the first and second connecting members 31 and 32 into an axial force and transmits it to the free end of the second axial force absorber 20.
In the figure, reference numerals 73 and 74 denote connection holes for attaching the first connecting member 31 and the protective net B, respectively, and the upper edge of the protective net B and the connecting end of the first connecting member 31 are respectively connected to the converging plate 70. It connects so that it can rotate freely.

In addition, a well-known connection means is applicable as another means which connects each edge part of said 1st, 2nd axial force absorbers 10 and 20 rotatably.
Further, instead of the configuration in which the bending material 11 is previously provided with a bending wrinkle, a mechanism that restricts the rotation direction of the end portions of the bending materials 11 and 21 may be employed.

<4.3> Cross arrangement of first and second axial force absorbers As shown in FIGS. 1 and 2, the first axial force absorber 10 and the second axial force absorber 20 are arranged to cross each other. To do.
In this example, although the form which penetrated the 1st axial force absorber 10 in the 2nd axial force absorber 20 is shown, the 2nd axial force absorber 20 is inserted in the 1st axial force absorber 10. FIG. You may penetrate and cross.
When crossing the first and second axial force absorbers 10 and 20, it is important to arrange the bending members 11 and 21 so as not to interfere with each other during compression deformation.

  The crossing angle of the first and second axial force absorbers 10 and 20 and the total length of the connecting members 31 to 33 represent the energy acting on the pressure receiving surface C1 in accordance with the situation at the installation site. The axial force absorbers 10 and 20 and the connecting members 31 to 33 are transmitted in a distributed manner while being related to act on the first and second axial force absorbers 10 and 20 as axial forces. .

<5> Connecting Material The connecting materials 31 to 33 are, for example, steel or fiber ropes, steel rods, steel plates and the like excellent in tensile strength, and the free end of the first axial force absorber 10 and the second axial force. A first connecting member 31 is connected between the free end of the absorber 20 and a second end between the free end of the first axial force absorber 10 and the base end side of the second axial force absorber 20. The connecting member 32 is connected, and the third connecting member 3 c is connected between the base end of the first axial force absorber 10 and the base end of the second axial force absorber 20.

  In this example, since the 1st, 2nd axial force absorbers 10 and 20 have a buffer function, the tension | tensile_strength burden of each connection material 31-33 becomes small compared with the past.

<6> Protective Net The protective net C is a structure having a pressure receiving surface C1, and includes, for example, any one of a rope material, a net material, a bar material, or a known combination of these plural materials.
Further, the protective net C may be divided into one span unit of the damper device B in addition to the entire length over a plurality of spans.

The protective net C is disposed on the slope mountain side of the damper device B, and the upper edge thereof is supported by the free end of the second axial force absorber 20.
The upper edge of the protective net C is attached directly to the free end of the second axial force absorber 20 or via a separate rope member connected to the free end of the second axial force absorber 20. It shall be attached indirectly.
In addition to the case where the lower end of the protective net C is installed on the pressure receiving plate 50 at the base end of the first axial force absorber 10, it may be installed directly on the mountain side slope.

[Action]
Next, the operation of the energy absorber will be described.

<1> Before Energy Action FIG. 2 shows the energy absorber A before energy acts.
The protective net C is supported by the free end of the second axial force absorber 20 that tilts to the slope mountain side, and the free end of the second axial force absorber 20 that has landed on the slope via the pressure receiving plate 60 is on the slope valley side. It is supported through the first axial force absorber 10 and the connecting members 31 to 33 that are tilted to the right.
The free end of the first axial force absorber 10 pivotally supported on the slope via the pressure receiving plate 50 is supported through the second axial force absorber 20 and the first connecting member 31.
Thus, the first and second axial force absorbers 10 and 20 constituting the protective net C and the damper device B before the action of energy maintain a stable posture with their weights balanced with each other.

<2> During Energy Operation The operation of the damper device B will be described with reference to FIG.

<2.1> Tilt restraint of the second axial force absorber When the energy acts on the pressure receiving surface C1, the protective net C bends to the slope valley side.
Along with the bending of the protective net C, a force in a direction in which the second axial force absorber 20 tilts forward on the slope mountain side around the pressure receiving plate 60 at the base end works.

  The pressure receiving plate 60 is grounded to the slope and is not fixed by a pin, but is supported by the upper pressure receiving plate 50 fixed by the anchor 56 through the third connecting member 33, so that the base end of the second axial force absorber 20 is supported. Is in a fixed position without moving.

  When a tilting force acts on the second axial force absorber 20, a tension acts on the first and second connecting members 31 and 32, and the first and second connecting members 31 and 32 become the second axial force absorber 20. Restrain the tilt of the.

<2.2> Tilt restraint of first axial force absorber At the same time, when tension is applied to the first and second connecting members 31, 32, the first axial force absorber 10 rotates counterclockwise around the base end. Tension is generated in the second and third connecting members 32 and 33 in an attempt to rotate in the direction of.
The tension acting on the second and third connecting members 32 and 33 is finally supported by the anchor 56, and the rotation of the first axial force absorber 10 in the counterclockwise direction is restricted.

  The tension generated in the protective net C and each of the connecting members 31 to 33 is balanced, and the resultant force of the tension acts on each of the axial force absorbers 10 and 20 as an axial force.

If the axial force acting on the first and second axial force absorbers 10 and 20 is equal to or less than the deformation strength of the first and second axial force absorbers 10 and 20, the first and second axial force absorbers. The bodies 10 and 20 do not compress and deform or tilt.
The energy finally acting on the pressure receiving surface C1 is dispersed and supported by the first and second axial force absorbers 10 and 20 and the first and second connecting members 31 and 32.

<2.3> Compression deformation of axial force absorber When the axial force generated in the first or second axial force absorber 10, 20 exceeds the deformation strength of the first or second axial force absorber 10, 20. One or both of the first and second axial force absorbers 10 and 20 start compressive deformation.

In the case of the first axial force absorber 10, since the plurality of bending materials 11 are curved in advance in the same direction, there is a linear guide shaft at the center of the first axial force absorber 10. Each bending material 11 is uniformly compressed and deformed while maintaining uprightness as it is.
Similarly, in the case of the second axial force absorber 20, each bending member 21 is kept upright as if a straight guide shaft exists at the center of the second axial force absorber 20. Uniformly compresses and deforms.
The energy acting on the pressure receiving surface C1 is absorbed by the first or second axial force absorbers 10 and 20 being compressed and deformed.

In this example, when an axial force is generated in the first or second axial force absorbers 10 and 20, the first or second axial force absorbers 10 and 20 maintain the uprightness in a specific direction (diameter expansion direction). Alternatively, it is configured to be elastically deformed in the reduced diameter direction).
In particular, the snow load or the like is used while being deviated with respect to the free end of the second axial force absorber 20, but the load is evenly distributed to each bending material 11 through the converging plate 70 shown in FIG. In addition, a snow load or the like acts parallel to the central axis of the second axial force absorber 20.
Therefore, the intermediate portion of the second axial force absorber 20 does not bend in one direction, and each bending material 11 can be uniformly compressed and deformed.
Therefore, since the first and second axial force absorbers 10 and 20 can exhibit a stable buffer function over a long period of time, energy applied to the pressure receiving surface C1 can be efficiently absorbed.

  Furthermore, even if a large axial force acts on the first and second axial force absorbers 10 and 20, the first and second axial force absorbers 10, Since 20 does not need to be suddenly damaged, loss of function of the energy absorber A can be avoided.

Moreover, the both ends of the bending materials 11 and 21 which comprise the 1st and 2nd axial force absorbers 10 and 20 have the form converged so that elastic deformation could be carried out with respect to all directions.
Therefore, the first and second axial force absorbers 10 and 20 can flexibly follow deformation and torsion caused by a load from an unexpected direction.
Therefore, energy received from various directions as the damper device B can be efficiently absorbed.

<3> After the disappearance of energy After the generation factor of energy is removed from the protective net C (pressure receiving surface C1), the first and second axial force absorbers 10 and 20 constituting the damper device B are self-elastic. Return to the original standby position by restoring force.
With the restoration of the damper device B, the protective net C is also pulled up to the original position.
Therefore, the function of the energy absorber A can be continuously maintained while maintaining the state before the action of energy.
For example, when the cause of energy generation is snow pressure, the axial force absorbers 10 and 20 naturally return to their original positions when the snow melts, so that the function of the energy absorber A can be achieved without taking any special measures. It can always be demonstrated.
[Reference Example 2]

  In the previous reference example 1, the case where the third connecting member 3c is used as the means for holding the base end of the second axial force absorber 20 in place has been described. However, as shown in FIGS. It is also possible to hold the base end of the second axial force absorber 20 in a fixed position without using the third connecting member 3c.

  FIG. 8 shows a form in which a pressure receiving plate 60 that supports the base end of the second axial force absorber 20 is fixed to the inclined surface by an anchor 64, and FIG. 9 is a top view that supports the base end of the first axial force absorber 10. The form which shared the pressure-receiving plate 50 of this to the slope trough side and was shared by the support of the base end of the 2nd axial force absorber 20 is shown.

In the form of FIG. 8 in which the first and second axial force absorbers 10 and 20 are individually fixed by separate anchors 56, the base end of the second axial force absorber 20 is directly fixed to the slope. Therefore, there is an advantage that resistance to the tension of the second connecting member 32 is increased.
Furthermore, there is a height difference between the base end of the first axial force absorber 10 and the base end of the second axial force absorber 20 or there are obstacles such as undulations. Effective for difficult sites.

  In the form of FIG. 9 in which the first and second axial force absorbers 10 and 20 share the pressure receiving plate 50, the pressure receiving plate 50 has a higher tensile strength than the connecting member 33, so that a larger energy is obtained. Suitable for working sites.

Although the above reference example demonstrated the case where the 1st and 2nd axial force absorbers 10 and 20 which comprise the damper apparatus B deform | transform elastically, any of the 1st or 2nd axial force absorbers 10 and 20 was demonstrated. One of them may be replaced with a non-elastic member body.
The pivotal support structure for each of the pressure receiving plates 50, 60 described above and the non-elastic member body, and the connection structure of the non-elastic member body and each of the connecting members 31 to 33 are the same as those in the above-described embodiment, and the functional force is axial. The only difference is that it does not compress and deform when the action is applied.
The non-elastic member includes a rigid material such as steel or concrete.

In the damper device B according to the present embodiment, since one of the first and second axial force absorbers 10 and 20 has an elastic function, the axial force burden of the inelastic member body can be reduced.
When the second axial force absorber 20 is configured by an inelastic member body, the fence height change of the protective net C can be suppressed to a small value, and when the first axial force absorber 10 is configured by an inelastic member body. Can promote the energy absorbing action of the second axial force absorber 20 alone.
The point is that either one of the first or second axial force absorbers 10 and 20 is not used depending on the load bearing performance required in the surrounding environment of the installation site of the energy absorber A and various conditions such as cost effectiveness. What is necessary is just to select suitably for an elastic member body.

  Although both ends of the first axial force absorber 10 are formed by folding the bending material 11 to have continuity, it may be formed in a converged form of pin coupling as in FIGS.

  Further, both end portions of the second axial force absorber 20 are shown in the form of convergence of pin coupling, but in the same manner as in FIGS. 3 and 4, the bending material 21 is folded back to form a convergence form. May be.

  When both ends of the axial force absorbers 10 and 20 are in a convergent form in which the bending members 11 and 21 are folded back to have continuity, the bending member is the amount corresponding to the spring force of the turned-up portion compared to the pin coupling. The deformation resistance of 11 and 21 is increased.

FIGS. 10 and 11 are free ends of the second axial force absorber 20, in which a holding rope 34 for preventing the fall of the damper device B is connected to the other side (slope mountain side) of the first connecting member 31. Indicates.
FIG. 10 shows the case where the lower end of the stay rope 34 is connected to the proximal end of the second axial force absorber 20, and FIG. 11 shows the lower end of the stay rope 34 of the first and second axial force absorbers 10, 20. The case where it branches and connects to each base end is shown.
Although not shown, the lower end of the holding rope 34 may be directly fixed to the mountain side slope.
In short, it is sufficient that the holding rope 34 is stretched so that the damper device B can be prevented from falling to the slope valley side.

  In the present embodiment, since the damper device B can be prevented from falling to the slope valley side, the damper device B can be used not only when the energy absorber A is assembled but also when a snow load or the like is applied after the assembly. Can be prevented from inadvertently falling to the sloped valley side.

A Energy absorber B Damper device C Protective net C1 Pressure receiving surface 10 First axial force absorber 11 Bending material 20 Second axial force absorber 21 Bending material 31 First connecting material 32 Second connecting material 33 Third connecting member 50, 60 pressure receiving plate

Claims (11)

A damper device having both a damper function and a support function,
A first axial force absorber fixedly tilted with a proximal end fixed;
A second axial force absorber that intersects with the first axial force absorber and that is tilted upright with a proximal end fixed;
A first connecting member that connects a free end of the first axial force absorber and a free end of the second axial force absorber;
A second connecting member for connecting the free end of the first axial force absorber and the proximal end of the second axial force absorber;
Either one of the first or second axial force absorber is composed of a plurality of bending materials,
Any one of the first and second axial force absorbers is made of a rigid material,
Damper device.   2. The damper device according to claim 1, wherein both end portions of the plurality of bending materials are converged and an intermediate portion of the plurality of bending materials is curved inward or outward.   3. The damper device according to claim 2, wherein both ends of the first or second axial force absorber are converged by folding the bending material to give continuity.   3. The damper device according to claim 2, wherein both ends of the first or second axial force absorber are converged by pin-coupling end portions of the respective bending members.   The damper device according to any one of claims 1 to 4, further comprising an anchor that fixes a proximal end of the first axial force absorber.   6. The damper device according to claim 5, further comprising a third connecting member that connects a base end of the first axial force absorber and a base end of the second axial force absorber.   The damper device according to any one of claims 1 to 5, further comprising a separate anchor for fixing the proximal end of the second axial force absorber.   6. The method according to claim 1, wherein the base end of the first axial force absorber and the base end of the second axial force absorber are connected by a common pressure receiving plate. A damper device.   The damper according to any one of claims 1 to 8, wherein a dampening rope is connected to the other end of the first connecting member at the free end of the second axial force absorber. apparatus. An energy absorber having a pressure receiving surface on the front surface of the protective net,
The damper device according to any one of claims 1 to 9, wherein the damper device is erected at an interval,
The upper edge of the protective net is attached to the free end side of the second axial force absorber of each adjacent damper device,
Energy absorber.   The elastic deformation of any one of the first and second axial force absorbers according to claim 10, wherein one or both of the first and second axial force absorbers causes the axial force generated by the energy acting on the pressure receiving surface to be maintained while the axial force absorbers are upright. An energy absorber characterized by absorbing and absorbing.

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