JP2006176998A - Impact-absorbing fence - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an impact-absorbing fence which can stop a colliding object without destroying the fence, even if the colliding object collides with the vicinity of a support. <P>SOLUTION: This impact-absorbing fence is constituted by horizontally laying three or more rope materials 21, 22 and 23 among three or more supports 11 and 12 which are erected at intervals. All the rope materials 21, 22 and 23 are connected to the end support 11. The rope material 23 which is arranged in a state of crossing the at least one intermediate support 12 without being connected to it can be moved in the direction opposite to the direction of the entry of the colliding object without being restrained by the support 12 when the colliding object collides with the fence. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an impact absorbing fence used for a rockfall prevention fence or a guard rope.

The thing of patent document 1 is known as an impact-absorbing fence used for a medium and small-scale rock fall prevention means.
As shown in FIG. 5, this conventional shock absorbing fence hangs a large number of rope members 81 in a multistage manner between steel struts 80 erected on the mountainside or roadside at a predetermined interval. The rope member 81 is connected via a connecting tool 82 attached to each column 80, a mesh 83 such as a rhombus wire mesh is attached to one side of each rope member 81, and the rigidity of the column 80 and the rope member 81 are configured. Further, the deformation of the net 83 is a mechanism for absorbing the impact energy held by the collision object W such as falling rocks.

In addition, an impact absorbing fence is also known in which a plurality of rope members 81 are horizontally mounted in a multistage manner between each support 80 via a coupling tool 82 having a buffer function at both ends of the span as shown in FIG.
JP-A-8-144226

The above-described conventional shock absorbing fence has the following problems.
(1) Since each rope member 81 laid horizontally is connected to each column 80 for each span, if the collision position of the colliding object W is in the vicinity of the column 80, the rope member 81 is sufficiently deformed. Since it cannot be broken, an excessive load acts on the rope member 81 itself and the connecting tool 82.
Therefore, the rope material 81 is broken or the connecting tool 82 is broken.
(2) When the collision object W collides with the vicinity of the center of the span, the rope member 81 and the net 83 are greatly deformed, so that the generated impact force is small and the shock absorbing fence is not destroyed. On the other hand, when the collision object collides with the vicinity of the support column, the rope member 81 is connected to the support column 80, so that the deformation amount of the rope member 81 and the net-like object 83 is small. Can easily be destroyed.
(3) As another shock absorbing fence, a rope material is stretched only on the upper and lower edges, a belt-like net is stretched between these upper and lower rope materials, and this net is not connected to the intermediate strut. A fence (not shown) is known.
In the case of this shock absorbing fence, it is necessary to use a net-like material knitted in a ring shape or a lattice shape with a wire having a high strength, and the construction cost including the material cost is high.

  The present invention has been made in view of the above points, and an object of the present invention is to provide an impact absorbing fence that can stop a colliding object without breaking even if the colliding object collides with the vicinity of a column. For the purpose.

In order to achieve the above object, the impact absorbing fence according to the first invention of the present application is an impact absorbing fence configured by horizontally laying three or more rope members between three or more struts standing at intervals. All the rope members are connected to the column of the terminal, and the rope members at the upper end and the lower end are engaged with the at least one intermediate column and arranged between the rope members at the upper end and the lower end. The rope material located in the crossing is arranged without being connected to at least one intermediate strut, and when the colliding object collides, the rope material is not restrained by the strut in the approach direction of the colliding object. It is configured to be movable in the opposite direction.
The impact absorbing fence according to the second invention of the present application is the sliding device according to the first invention, wherein an impact absorbing device is attached to the end of the rope material or the middle of the rope material, and when the tensile force of the rope material reaches a certain value or more. It is characterized by being configured to allow movement.
The shock absorbing fence according to the third invention of the present application is characterized in that in the first or second invention, a net is provided across a plurality of rope members.

The present invention can obtain the following effects.
(1) Even when a collision object collides near the intermediate strut of the shock absorbing fence, the intermediate rope member is not connected to the intermediate strut, so that it can be greatly deformed.
Therefore, the energy absorption effect is large, and hence the impact force is small, and an economical design is possible.
(2) By interposing the shock absorbing device on the rope material, the amount of energy that can be absorbed is further increased, and the performance of the shock absorbing fence is remarkably improved.
(3) Since at least one impact absorbing device is sufficient in the connecting section of the intermediate rope material, it is more economical.
(4) Since the intermediate strut does not require a mounting bracket or the like for supporting the intermediate rope material, the processing of the strut can be simplified.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(1) Outline of shock absorbing fence FIG. 1 is an overall view of the shock absorbing fence, and FIG. 2 is a side view thereof.
The shock absorbing fence according to the present invention includes a support column 10 (terminal support column 11 and intermediate support column 12) erected at intervals, and a plurality of rope members 20 (uppermost edge rope member 21, A lowermost rope member 22, an intermediate rope member 23), and a wire mesh and a rope mesh 30 attached integrally to each rope member 20.
Although this example shows a case where a plurality of intermediate rope members 23 are horizontally mounted, the intermediate rope members 23 may be one or more.

(2) Prop (Fig. 1)
For the support column 10, for example, a rigid member such as an H-shaped steel material or a steel pipe is used.
The bottom of the column 10 is erected by embedding the lower part in the concrete foundation 70, or a base plate is attached to the lower end of the column 10 and the end of the holding rope connected to the upper part of the column 10 is connected to the ground side anchor and supported. Or you may.

(3) Mesh object The mesh object 30 is a member for cooperating with each rope member 20 to absorb the energy of the collision object W by deformation and to restrict the transmission of the small pieces of the collision object W. To wear.
Since the net-like object 30 also functions to prevent the horizontal interval between the rope members 20 from being freely expanded, the dedicated item shown in FIG. 1 is composed of a resistor member such as a steel plate or rope member and a coupling tool such as a clip. The spacing member 40 may be omitted.

(4) Shock Absorbing Device The shock absorbing device 50 is a device that is interposed in the middle position of the rope member 20 and absorbs this tension energy when a tension higher than the setting acts on the rope member 20.
As the shock absorbing device 50, a known energy absorbing device such as a method of absorbing tension by frictional resistance or a damper method of absorbing by fluid resistance can be applied.
By interposing the impact absorbing device 50, it is possible to effectively absorb excessive impact energy acting on the rope member 20 and not to apply a load more than the setting to the connecting portion at the end of the rope member 20. The breakage of the rope member 20 and the breakage of the connecting portion can be achieved.

(5) Attaching form of the rope material As described above, in the conventional shock absorbing fence, the crossing point of the support column and the rope material is connected and horizontally mounted.
In the present invention, when the colliding object W collides with the shock absorbing fence, the rope member 20 and the net 30 attached thereto can be moved to the opposite side of the entering direction of the colliding object W without being restrained by the support column 10. The rope member 20 was attached to the support column 10 as follows.

The rope member 20 (the uppermost rope member 21, the lowermost rope member 22, and the intermediate rope member 23) laid horizontally between the columns 10 is a rope material having excellent tensile strength such as a wire rope, and collides with the column 10. It arrange | positions on the opposite side to the approach side of the thing W.
More precisely, the intermediate rope member 23 may be disposed on the side opposite to the entrance side of the collision object W with respect to the support column 10.

The attachment form of the rope member 20 (the uppermost rope member 21, the lowermost rope member 22, and the intermediate rope member 23) will be described in more detail. The ends of the uppermost rope member 21 and the lowermost rope member 22 are terminal struts. 11 is directly connected to the terminal 11 via a connecting tool 60 such as a known clip.
The intermediate portion excluding the ends of the uppermost rope member 21 and the lowermost rope member 22 engages with the intermediate strut 12 for each span.
“To engage” the intermediate portion of each rope member 21, 22 with the intermediate strut 12, for example, insert each rope member 21, 22 into hooks formed intermittently along the height direction of the intermediate strut 12. As shown in the figure, an attachment state in which the ropes 21 and 22 are allowed to freely slide in the longitudinal direction while restricting fluctuations in the attachment height with respect to the intermediate strut 12, or an attachment state in which the displacement in the longitudinal direction is restricted. That means.

The end of the intermediate rope member 23 is directly connected to the terminal column 11 via the connector 60.
The intermediate portion excluding the end portion of the intermediate rope member 23 is not connected to the intermediate strut 12 and is left free. The sagging of the intermediate portion of the intermediate rope member 23 due to its own weight is dealt with by the tension of the intermediate rope member 23 or the lifting of the uppermost edge rope member 21 via the mesh 30 or the spacing member 40.
A net 30 is stretched between the rope members 20.

[Action]
Next, the shock absorbing action by the shock absorbing fence will be described.

(1) When the collision position is at the center of the span (Fig. 3)
The shock absorbing action will be described based on a horizontal sectional view at the position of the intermediate rope member 23 in which a part of the shock absorbing fence at the time of impact is omitted in FIG.
Since the rope member 20 (the uppermost rope member 21, the lowermost rope member 22, and the intermediate rope member 23) is attached to the support column 10 (terminal support column 11 and intermediate support column 12) in the above-described manner, the collision object W is impacted. In the event of a collision near the center of the absorption fence span, all the rope members 20, the mesh 30 attached thereto, and the spacing member 40 (not shown in FIG. 3) are opposite to the entry side via the mesh 30. Deform in the direction. All the rope members 20 and the mesh 30 attached thereto move to the opposite side of the approaching direction of the collision object W without being restrained by the support 10.

The rope material 20 in the vicinity where the colliding object W collides is greatly deformed, and the deformation of the rope material 20 becomes smaller as the distance from the collision position increases.
However, since all the rope members 20 are deformed in the direction opposite to the entrance side of the collision object W and can absorb a large amount of energy, the impact force to be borne by each component of the impact absorbing fence is reduced.
In particular, according to the present invention, since the rope member 20 is not connected to the intermediate strut 12 even when it collides with the center of the span, the conventional shock absorbing fence in which the rope member 81 shown in FIG. In comparison, the deformation amount of the rope member 20 is increased. In particular, the deformation amount of the intermediate rope member 23 is larger than that of the uppermost lower rope members 21 and 22. Thus, the impact force can be reduced by an amount corresponding to an increase in the deformation amount of the rope material 20.

(2) When the collision position is near the column (Fig. 4)
If all the rope members 20 are connected to the support column 10, even if the impact absorbing device is attached, it cannot be greatly deformed, and the impact force at the time of impact is increased.

On the other hand, in the present invention, when the colliding object W collides with the vicinity of the column 10 as is apparent from FIG. 4 which shows a horizontal sectional view of the shock absorbing fence when the colliding object W collides with the vicinity of the column 10. The rope members 21 and 22 at the uppermost edge and the lowermost edge are engaged with the intermediate strut 12, but the intermediate rope member 23 is not engaged with the intermediate strut 12, so that the intermediate rope member 23 can be deformed. Therefore, efficient energy absorption can be expected.
At this time, since the intermediate rope member 23 and the mesh 30 are allowed to freely deform the intermediate strut 12 in the direction opposite to the approaching direction of the colliding object W, the colliding object W collides with the vicinity of the strut 10. Even in this case, the impact force can be reduced as in the case of collision with the center of the span.

  Further, even when the shock absorber 50 is interposed in the rope member 20, if the intermediate rope member 23 is connected to each intermediate support 12 and attached, it is necessary to attach the shock absorber 50 for each span. Since the intermediate rope member 23 is not connected and attached to the intermediate strut 12 as in the invention, it is only necessary to interpose at least one shock absorbing device 50 between the connections.

(3) Other Modifications If the impact absorbing device 50 is additionally provided between the end strut 11 and the end of the rope member 20, the effect of preventing the breakage of the rope member 20 and the absorption performance of the impact energy are improved.

Further, as described above, the spacing member 40 is not essential, and may be omitted and replaced with the mesh 30.
Further, when the impact energy is small or the rope length is long, the impact absorbing device 50 interposed in the middle portion of the rope member 20 may be omitted.

  In addition to the case where the intermediate rope 23 is directly connected to the terminal strut 11 as described above, for example, a separate rope is stretched on the upper and lower ends of the terminal strut 11 and this rope is connected. The intermediate rope 23 may be connected via

  The intermediate rope member 23 is not connected to the intermediate strut 12 in principle. However, when the shock absorbing fence is not linear and has a bent portion, or when the engagement interval with the intermediate strut 12 is long. In some cases, the intermediate portion of the intermediate rope member 23 is engaged with the intermediate strut 12.

Front view of shock absorbing fence according to the present invention 1 is a longitudinal sectional view of FIG. Horizontal cross-section model diagram of shock absorbing fence at the time of impact Horizontal cross-section model diagram of shock absorbing fence at the time of impact Front view of conventional shock absorbing fence Front view of another conventional shock absorbing fence

Explanation of symbols

10 ... strut 11 ... terminal strut 12 ... intermediate strut 20 ... rope material 21 ... top edge rope material 22 ... bottom edge rope material 23 ... intermediate rope material 30 ...・ Reticulated material 40 ... spacing member 50 ... shock absorber

Claims (3)

An impact absorbing fence constructed by horizontally laying three or more rope members between three or more struts erected at intervals,
Connect all the ropes to the terminal struts,
Engaging and arranging the rope material at the upper and lower ends with at least one intermediate strut;
The rope material located between the rope material at the upper end and the lower end is arranged to intersect without being connected to at least one intermediate strut,
When the colliding object collides, the rope material is configured to be movable in the direction opposite to the entering direction of the colliding object without being restrained by the support column,
Shock absorbing fence.   2. An impact absorbing fence according to claim 1, wherein an impact absorbing device is attached to an end portion or middle of the rope material, and sliding is permitted when the rope material reaches a certain tensile force or more. . The shock absorbing fence according to claim 1 or 2, wherein a net-like material is provided across a plurality of rope members.

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