JP2000273828A - Shock absorbing protective fence - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the execution cost and to improve shock damping performance by fitting buffers allowing the sliding of ropes, holding the end sections of the ropes with individual buffers, and individually setting the holding force of the ropes. SOLUTION: This shock absorbing protective fence is constituted of supports 20 erected on a slope 10, a plurality of ropes 30, 31, 32... horizontally stretched between the supports 20, and a net material 40 stretched between upper and lower ropes 30, 31, 32. Buffers 50 are provided on individual ropes 30, 31, 32..., and the holding force (sliding resistance) is individually set. When a falling stone collides with the net material 40, the shock is applied to the ropes 30, 31, 32... as tensile force. When the tensile force exceeds the holding force of the buffer 50, each rope starts sliding, and shock energy is damped by this sliding resistance. The ropes 30, 31, 32... can be reliably prevented from being released, and release dedicated stoppers can be omitted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shock absorbing protective fence for attenuating the impact energy of falling objects such as falling rocks and avalanches.

[0002]

2. Description of the Related Art A pillar is erected on a slope or the like at a predetermined interval, a horizontal rope material is gripped by a buffer provided on the pillar, and a horizontal rope material is stretched.
Rockfall protection fences that attenuate and support impact energy such as rockfall due to the combined resistance of the deformation resistance of the net material, the sliding resistance between the horizontal rope material and the shock absorber, and the strength and deformation resistance of the columns are known.

[0003]

<B> Conventionally, a single shock absorber grips two horizontal rope members on the left and right sides and applies an equal gripping force to the left and right ropes. This damping method is effective when the span length of the strut is constant.However, when the span length of the strut changes, that is, when the length of the horizontal rope material suspended between There is a disadvantage that the gripping force of the rope material cannot be set differently.

<B> In consideration of parts management and workability at the site, it is desirable that the number of components of the protective fence be small, and a proposal for an improvement technique thereof is desired.

<C> In the conventional protective fence, it is possible to construct a high-strength, high-performance protective fence if the cost is ignored, but generally, if the cost is given priority, the attenuation performance is strongly sacrificed. Can be In this way, under the current trend of giving priority to cost, it is technically difficult to achieve both a reduction in construction cost and an improvement in impact damping performance.

[0006] The present invention has been made in view of the above points, and an object of the present invention is to provide a shock absorbing protective fence capable of individually setting a gripping force of a rope material.

It is a further object of the present invention to provide a shock absorbing protective fence capable of reducing the number of components.

Another object of the present invention is to provide a shock absorbing protective fence capable of achieving both a reduction in construction cost and an improvement in shock damping performance.

[0009]

The invention according to claim 1 is
At a shock absorbing protective fence in which a plurality of rope members are laid horizontally between columns erected at predetermined intervals and a net material is stretched around the rope members, a tensile force exceeding the gripping force set for each column. Attaching a shock absorber that allows the rope material to slide by the action of, gripping the vicinity of the end of each rope material with individual shock absorbers, the grip force of each rope material can be set individually. It is a shock absorbing protective fence.

According to a second aspect of the present invention, in the shock absorbing protective fence according to the first aspect, the shock absorber has a groove for accommodating two rope materials, and the two near the end of the rope material. An impact-absorbing protective fence, characterized in that it is gripped by one of the grooves and the end of the extra length is gripped by another groove.

According to a third aspect of the present invention, in the shock-absorbing protective fence according to the first aspect, a plurality of rope members are bundled and suspended between the columns, and a unit of the bundle of the rope members is an individual shock absorber. A shock-absorbing protective fence characterized by being gripped by:

According to a fourth aspect of the present invention, in the shock absorbing protective fence according to any one of the first to third aspects, a diagonal rope material is connected between the columns, and a shock absorber is provided in the middle of the diagonal rope material. It is a shock absorbing protective fence characterized by being interposed.

[0013]

Embodiment 1 Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

<A> Shock-absorbing protective fence FIG. 1 shows an example of the shock-absorbing protective fence. The shock-absorbing protective fence includes a pillar 20 erected on the slope 10 and a plurality of rope members 30, 31, 32,.
.. Consist of a net member 40 stretched over the upper and lower rope members 30, 31, 32.

In this embodiment, the rope members 30, 31, 32,.
Will be described as an example in the case where the
.. May be additionally provided in the middle of the column 20, and the number of installation steps of the rope members 30, 31, 32,... Is appropriately selected according to the site. Hereinafter, the main members will be described in detail.

<B> Supports FIG. 2 shows an upper part of the support 20. The support column 20 is made of a known various rigid material such as a steel material or a concrete column, and a lower portion thereof may be embedded in the base concrete or directly on the slope 10.
It may be erected via a hinge that can be tilted in the inclination direction of the slope 10 or the longitudinal direction of the fence. A mounting bracket 21 protrudes from upper and lower portions of the peripheral surface of the column 2 or an intermediate portion thereof, and a hole through which the rope material 30 can be inserted is formed in the mounting bracket 21.

Incidentally, if necessary, a stay rope may be connected between each pillar 20 and the slope 10, or a shock absorber described later may be provided at the end or middle of the stay rope.

<C> Rope material Each of the rope materials 30, 31, 32,.
Are overlapped and arranged at 20 places of each support, and each rope material 3
Buffers 50 described below are individually attached near the ends of 0, 31, 32,..., And extra lengths 30a, 31a, 32a,. The extra length portions 30a, 31a, 32a.
2 is within the allowable sliding range.

As described above, the conventional method has been to grip the two left and right rope members with equal force by one shock absorber.

In the present invention, a buffer 50 is provided for each of the rope members 30, 31, 32,... So that the gripping force, that is, the sliding resistance can be set individually.

<D> Shock absorber As shown in FIG. 3, the shock absorber 50 is composed of two divided plates 51 and 5.
1 and a U bolt 52 for fastening between these two plates 51, 51
And the nut 53, and the two divided plates 51, 5
Each of the rope members 30, 31, 32 on the opposing surface in units of one
Are formed, each having an arc-shaped groove 54 capable of accommodating...
By adjusting the fastening force of the bolt 52 and the nut 53, the gripping force (sliding resistance) of each of the rope members 30, 31, 32,... Can be individually set.

In this embodiment, as shown in FIG.
1 shows a case where the shock absorber 50 is brought into contact and attached. In this manner, the mounting bracket 21 through which the rope members 30, 31, 32,.
2. After lightly tensioning the back side (surface against tension)
Can be attached to the column 20 simply by gripping each of the rope members 30, 31, 32,..., So that special operations such as bolting or welding to attach the buffer 50 to the column 20 can be performed. No need.

Incidentally, the shock absorber 50 may be directly bolted to the column 20, and the mounting means is not limited.

The illustrated shock absorber 50 is merely an example, and the present invention is not limited to this. Needless to say, a known shock absorber having the same function can be applied.

<E> Net Material The net material 40 is a net knitted with a rigid wire such as a steel wire or a wire, and a coil material or the like is wound around the entire length of each of the rope materials 30, 31, 32,. Net material 4
0 is movably connected.

[0026]

Next, the damping effect when a falling rock impacts the shock absorbing protective fence will be described.

<A> At the time of impact When rock falls collide with the net material 40, the impact energy is attenuated by sliding of the wire material constituting the net material 40 and bending deformation toward the downstream side of the slope. Further, the impact acting on the net member 40 is applied to each of the rope members 30 supporting the net member 40,
31, 32...

The impact acts on each of the rope members 30, 31, 32,... As a tensile force. When the tensile force exceeds the gripping force of the shock absorber 50, each of the rope members 30, 31, 32,. The impact energy is attenuated by the sliding resistance.

The net material 40, each rope material 30, 31, 3
2 and the impact transmitted to the support 20 via the shock absorber 50 is
Finally, it is transmitted to the support 20. When a stay rope (not shown) is connected to the support column 20 or a buffer is connected to the stay rope, it is attenuated by the sliding resistance of each rope and the buffer.

[0030]

Second Embodiment FIGS. 4 to 6 show another embodiment in which each of the rope members 30, 31,... Is gripped by using a shock absorber 50 having a plurality of rope accommodating grooves 54, 54. FIG. Since the basic structure of the shock absorber 50 is the same as that of the first embodiment, the same portions are denoted by the same reference numerals and description thereof will be omitted.

In the case of this example, the shock absorber 50 is composed of two divided plates 5.
The difference from the previous example is that arc-shaped grooves 54, 54 are arranged side by side on the opposing surfaces of 1, 51 in units of one.

The arrangement of the rope members 30, 31 will be described. FIG. 5 shows the extra length 31 of each of the rope members 31, 32.
An example is shown in which a and 32a are bent back and the ends are held by the shock absorber 50.

In the embodiment shown in FIG. 5, the buffer 50 functions as a stopper for restricting the extra length portions 30a and 31a from coming off, so that a dedicated stopper can be omitted and the number of components of the fence can be reduced. You.

FIG. 6 shows a form in which each of the rope members 30, 31... Is folded in two, and each of the rope members 30, 31 is gripped by an individual shock absorber 50. In addition, each rope material 30,3 which was doubled
The extra lengths 30a and 31a at the ends of 1 are endlessly looped as shown, and the other ends are left independent.
The embodiment of FIG. 6 is suitable for a site having a large impact force.

Further, as compared with the case where a large-diameter rope material is used, the diameter of each of the rope materials 30 and 31 to be used can be reduced, so that the weight is reduced, and the transportability and the handling property on the site are improved. Furthermore, compared with the case of a single large-diameter rope material, there is an advantage that the sliding resistance is increased because the contact area with the shock absorber is increased. In the case of FIG. 6 as well, as in FIG.
Functions as a stopper for restricting the loop-shaped surplus portions 30a, 31a from coming out, so that the number of component parts can be reduced.

[0036]

Fourth Embodiment FIG. 7 shows each of the adjacent columns 20,2.
Another embodiment is shown in which diagonal rope members 60, 60 are additionally attached so as to cross diagonally between 0, and a shock absorber 50 is provided at a position where the diagonal rope members 60, 60 overlap. The net member 40 and each of the slant rope members 60, 60 are connected by a coil or the like in such a manner that the sliding movement is allowed.

In this embodiment, the slanted rope members 60, 60, which are diagonally stretched, function as reinforcing members for the net member 40, and in addition, a shock is applied between the slanted rope members 60 and the shock absorber 50. Because it can be attenuated, the shock absorbing performance of the entire fence is significantly improved.

[0038]

According to the present invention, the following effects can be obtained.

<A> Conventionally, two rope members on the left and right sides have been gripped by one shock absorber. In the case of this gripping method,
Since the left and right ropes are gripped with equal force, there is an inconvenience that the gripping force of the left and right rope materials cannot be set individually when the span length of the column is changed. The present invention is suitable for such a site because the gripping force of the rope can be individually set.

<B> When a shock absorber having a plurality of rope accommodation grooves is used, the extra length of the rope material is bent back,
The end of the rope material can be reliably prevented by gripping the end portion with the shock-absorbing member, and a dedicated stopper for preventing the pull-out can be omitted. Therefore, the dedicated stopper can be omitted, and the number of components of the fence can be reduced.

<C> By using a double rope material, the same tensile strength as that of the large-diameter rope material can be ensured, and the contact area with the shock absorber increases compared to the large-diameter rope material, resulting in a greater damping effect. Can be obtained.

Furthermore, the weight per unit length is smaller than that of the large-diameter rope material, which is advantageous in terms of transportation and handling on site. Particularly, it is suitable for a site having a large impact force.

<D> By attaching a diagonal rope material diagonally between the columns and providing a buffer in the middle of the diagonal rope, the diagonal rope material functions as a reinforcing material for the net material, and the diagonal rope material and the buffer material Since the impact can be attenuated between the fittings, the shock absorption performance of the entire fence is significantly higher.

<E> From the above, it is possible to achieve both a reduction in construction cost and an improvement in impact damping performance.

[Brief description of the drawings]

FIG. 1 is a front view of a shock absorbing protective fence according to the present invention.

FIG. 2 is a perspective view of the upper part of a support.

FIG. 3 is a central sectional view of the shock absorber.

FIG. 4 is a central sectional view of another shock absorber.

FIG. 5 is an explanatory diagram of a processing example of a surplus portion;

FIG. 6 is an explanatory diagram of a processing example of a surplus portion;

FIG. 7 is a model diagram of another shock absorbing protective fence.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Slope 20 Prop 30, 31, 32 Rope material 40 Net material 50 Shock absorber 60 Sloped rope material

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kinshi 2-14-4 Yaesu, Chuo-ku, Tokyo Inside Kanemori Tohei Corp. (72) Inventor Toshimitsu Nomura 3903 Taromaru, Tonami-shi, Toyama Prefecture F-term in ROTEC Engineering Tech (reference) 2D001 PA05 PA06 PB04 PC03 PD06

Claims (4)

[Claims] 1. A gripping force set for each column in a shock-absorbing protective fence in which a plurality of rope members are horizontally laid between columns erected at predetermined intervals and a net member is stretched around the rope members. A shock absorber that allows the rope material to slide due to the action of the pulling force that exceeds the tension is attached, and the vicinity of the end of each rope material is gripped with individual shock absorbers, and the gripping force of each rope material can be set individually A shock absorbing protective fence characterized by: 2. The shock absorbing protective fence according to claim 1, wherein the shock absorber has a groove for accommodating two rope materials, and a portion near an end of the rope material is gripped by one of the two grooves. A shock absorbing protective fence, characterized in that the end of the extra length is gripped by another groove. 3. The shock-absorbing protective fence according to claim 1, wherein a plurality of rope materials are bundled between the columns and laterally suspended, and a unit of each rope material bundle is gripped by an individual shock absorber. The shock absorbing protective fence. 4. The shock absorbing protective fence according to claim 1, wherein a diagonal rope material is connected between the columns, and a shock absorber is interposed in the middle of the diagonal rope material. The shock absorbing protective fence.