JP3680208B2 - Rope spacing device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rope spacing device.
[0002]
[Prior art]
In order to protect roads and private houses from falling objects such as falling rocks and avalanches, falling rock protection fences and avalanche protection fences are installed on the slopes, and avalanche prevention fences are installed to prevent the occurrence of avalanches.
In these rockfall protection fences, avalanche protection fences and avalanche prevention fences (hereinafter collectively referred to as protection fences), ropes are stretched in parallel at regular intervals between struts erected at predetermined intervals. .
When a rockfall or avalanche occurs, the distance between the ropes increases due to a rockfall or avalanche that collides with the protective fence.
In the past, the distance between ropes was widened by collisions such as falling rocks, and accidents such as falling rocks passing through them and colliding with nearby vehicles occurred frequently.
In order to prevent this, it is common to connect the ropes with wire ropes, chains, steel plates, etc. to prevent the distance between the ropes from expanding.
[0003]
[Problems to be solved by the invention]
The conventional method for maintaining the distance between the ropes of the protective fence has achieved its purpose from the viewpoint of preventing the distance between the ropes from expanding, but problems are recognized in the following points.
<B> The wire mesh (net) stretched around the protective fence due to the collision of falling rocks and avalanches tends to bend and spread largely around the collision position, but the space mesh is restrained from spreading, and the energy of the wire mesh Absorption function is impaired.
<B> Since the distance maintaining material is not extended, the impact energy absorption capacity of the protective fence is reduced, the impact force is increased, and a more rigid support column and support structure are required.
<C> If impact force such as falling rocks acts on the protective fence and the protective fence (net, rope) protrudes to the sloped valley side, almost no expansion of the spacing material can be expected. It bends closer to the center, reducing the vertical width of the protective net that should be the receiving surface. For this reason, when the next falling rock falls, it passes through the gap below the protective fence or comes off, and the height of the protective fence is reduced, and it is considered that the protective fence jumps over.
[0004]
OBJECT OF THE INVENTION
The present invention has been made in view of the conventional problems as described above, and can provide the maximum energy absorption effect of the protective net (wire net), and the distance between the ropes that can suppress the impact force to a minimum. An object is to provide a holding device.
It is another object of the present invention to provide a rope interval holding device that can suppress the decrease in the vertical interval of the protective fence as much as possible when an impact such as falling rocks occurs.
The present invention is intended to achieve at least one of the above objects.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, a rope interval holding device of the present invention is a rope interval holding device stretched substantially parallel to each other, and a plurality of interval holding members arranged to overlap each other between the ropes. And a holding bolt for fixing each of the spacing members to the rope, and friction connecting means for frictionally coupling the overlapped spacing members with a predetermined force, and having a constant value on the spacing member. When the above force is applied, the spacing members slide with each other to open the spacing between the ropes.
The rope spacing device of the present invention is characterized in that the amount of rope opening is limited within a certain value.
The rope spacing device of the present invention is characterized in that the amount of rope opening is limited by the length of the long holes formed in the length direction of the spacing material.
In the rope interval holding device of the present invention, the friction coupling means is composed of a tightening bolt and a nut, the tightening bolt is inserted into a long hole opened in the length direction of the interval holding material, and the interval holding material is used with the nut. They are characterized by being fastened together and frictionally connected.
The rope spacing device of the present invention is characterized in that the overlapping surface of the spacing materials is formed so that the frictional force increases.
The rope spacing device of the present invention is characterized in that the spacing force increases with the mutual sliding amount of the spacing material.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments according to the present invention will be described below with reference to the drawings.
[0007]
<A> Spacing device 1
The interval holding device 1 includes a plurality of interval holding members 2 overlapped with each other, a holding bolt 3 for fixing the interval holding member 2 to the rope 4, and friction connecting means 5 for frictionally connecting the overlapped interval holding members 2 to each other. And consists of
In the present invention, when a force of a certain value or more is applied to the spacing member 2, the spacing member 2 slides against each other to open the interval between the ropes 4 and to limit the opening amount within a certain value. It is a thing.
[0008]
<B> Spacing material 2
The spacing member 2 is for retaining the vertical spacing of the rope 4.
The spacing members 2 are overlapped with each other and disposed between the ropes 4.
The spacing member 2 is an elongated plate body having rigidity such as steel and fiber reinforced plastic (FRP), and is configured by forming an elongated hole 21 in the longitudinal direction in the center of the plate body. The holding bolt 3 and the fastening bolt 51 are inserted into the long hole 21. In addition, the bolt diameter of the holding bolt 3 is formed to be thicker than the width of the long hole 21, and an opening 23 for inserting the holding bolt 3 is provided in the substantially central portion of the spacing member 2 (see FIG. 2A).
The spacing member 2 is formed so that the width thereof is narrow at the center and gradually widens toward both ends.
The spacing member 2 may be formed by bending in the length direction (see FIG. 2B). Note that the bent portion may be formed by bending only the overlapping surface.
The spacing member 2 formed in this way is fixed to the rope 4 with the holding bolt 3.
[0009]
<C> Holding bolt 3
The holding bolt 3 is for fixing the space holding member 2 to the rope 4 and is made of, for example, a U bolt.
The U bolt 3 is inserted into the opening 23 across the rope 4, and a nut 31 is screwed into the U bolt 3 from the opposite side, and the rope 4 is tightened between the spacing member 2 and the U bolt 3.
Thereby, the spacing member 2 can be fixed in the vertical direction substantially orthogonal to the rope 4.
[0010]
<D> Friction connecting means 5
By fixing each spacing member 2 to the rope 4, the widely formed portions of the spacing member 2 overlap and the long holes 21 coincide (see FIG. 1).
The fastening bolts 51 are inserted into the long holes 21 that coincide with each other, and nuts 52 are screwed into the fastening bolts 51 from the opposite side, and the overlapping portions are fastened with a predetermined force to frictionally connect the spacing members 2 to each other.
In addition, the bolt diameter of the fastening bolt 51 is formed to be narrower than the width of the long hole 21 and is movable along the longitudinal direction of the long hole 21.
By adjusting the tightening force of the tightening bolts 51, the slip force (interval retaining force) between the spacing members 2 can be adjusted.
Therefore, the tightening bolt 51 inserted through the long hole 21 and the nut 52 screwed into the tightening bolt 51 constitute the friction coupling means 5 that frictionally couples the interval holding members 2 overlapped with each other.
[0011]
When a force greater than a certain value exceeding the frictional force (force greater than the slip starting force) acts on the spacing member 2, the spacing member 2 slides (slips) with each other to widen the spacing.
When the slip start force is less than or equal to the slip start force, the distance between the ropes 4 is the distance A (FIG. 3 (a)) held by the distance holding device 1, but a force greater than the slip start force is applied to the gap holding material. When the two slip to each other, the rope 4 opens up and down, and the interval is the interval B shown in FIG.
The slip of the spacing member 2 continues until one end 22 of the long hole 21 comes into contact with the tightening bolt 51. Therefore, the opening amount of the rope 4 is the length of the long hole 21 formed in the length direction of the spacing member 2. Limited by
[0012]
When the spacing member 2 is bent in the length direction, the frictional force increases, so that a larger slip force can be expected. The frictional force can be adjusted by changing the amount of bending.
In addition, you may shape | mold the overlapping surface of the space | interval holding material 2 so that a frictional force may increase, without limiting to a bending.
Further, when the width of the spacing member 2 is narrow at the center and widened toward both ends, the frictional force increases with the slip amount, so that the slipping force (spacing holding force) can be increased. (See FIG. 4).
In FIG. 4, the slip start force corresponds to the frictional force obtained by tightening with the tightening bolt 51, and the spacing member locking force is a stopper obtained by the end 22 of the long hole 21 coming into contact with the tightening bolt 51. As a locking force.
Thus, by increasing the slip force (spacing holding force) together with the slip amount between the spacing members 2, it is possible to prevent slip from concentrating only on a specific spacing member 2.
Since the elongation capacity of the wire net (protective net) has a limit, when the vicinity of the limit value is reached, the end 22 of the long hole 21 abuts against the tightening bolt 51 so that the space between the ropes 4 is not further opened. The stopper works.
In addition, if the friction force is increased with the slip amount of the spacing member 2 and the slip force (spacing retaining force) can be increased, the width of the spacing member 2 is widened toward both ends. The method may be used.
[0013]
<E> Example Used for Guard Fence The interval holding device 1 of the present invention can be used for the guard fence 10 (see FIG. 5).
The protective fence 10 has a plurality of ropes 4 stretched in parallel between the columns 11, a protective net 12 is stretched, and a mountain side rope 13 and a valley side rope 14 are installed to prevent the column 11 from tilting. Normal one.
The spacing member 2 is fixed and attached to one of the ropes 4 stretched in parallel with each other with the retaining bolt 3.
The spacing members 2 are fixedly attached to the ropes 4 with the retaining bolts 3 and arranged so that the widely formed portions overlap each other. The fastening bolt 51 is inserted into the elongated hole 21 in the overlapped portion, and the nut 52 is screwed and tightened to frictionally connect the spacing members 2 to each other.
In this way, the spacing members 2 are frictionally connected to each other, and the spacing device 1 is installed in the vertical direction substantially orthogonal to the plurality of ropes 4 stretched in parallel with each other. The interval holding device 1 is installed in the longitudinal direction of the rope 4 at an appropriate interval.
In addition, after the space | interval holding | maintenance material 2 is friction-connected previously and the space | interval holding device 1 is comprised, you may fix the space | interval holding device 1 to the rope 4 with the holding | maintenance volt | bolt 3, and may install.
[0014]
[Action]
Hereinafter, the operation of the interval holding device of the present invention will be described.
[0015]
<A> At the start of sliding, the plurality of ropes 4 are fixed to the spacing member 2 with the retaining bolts 3 and the ropes 4 maintain the spacing A (see FIG. 3A).
When falling rocks or the like collide with the protective net 12, the protective net 12 is deformed so as to wrap the falling rocks, the net surface protrudes from the sloped valley, and the protective net 12 tends to extend in the vertical direction.
As a result, the rope 4 also receives a force in the vertical direction and tries to widen the vertical interval, and a tensile force is generated in the interval holding member 2.
At this time, by adjusting the tightening force of the tightening bolt 51 that constitutes the frictional coupling means 5, it is possible to adjust the slip starting force at which the spacing members 2 start to slip with each other.
[0016]
<B> At the time of sliding In the present invention, the spacing members 2 that connect the ropes 4 to each other are frictionally connected.
For this reason, as described above, when falling rocks or the like collide with the protective net 12, the net surface protrudes on the sloped valley side, the protective net 12 extends in the vertical direction, and the rope 4 also attempts to widen the vertical distance. When the tensile force reaches the slip start force, the spacing members 2 slip each other.
When the spacing member 2 slips to each other, the rope 4 also widens the vertical spacing.
In the case of restraining the spread of the distance between the ropes as in the case of a conventional spacing member (wire rope, chain, steel plate, etc.), the energy absorbing function of the protective net is impaired. Since the distance between the ropes 4 is increased according to the slip, the energy absorption function of the protective net 12 is not impaired.
[0017]
<C> Absorption of Impact As described above, when the tensile force reaches the slip start force and exceeds this, the spacing members 2 slip to each other and follow the vertical extension of the protective net 12. During this time, a part of the impact energy is absorbed by the extension of the protective net 12 and the slip of the spacing member 2.
The slip between the spacing members 2 continues until the spacing A of the ropes 4 increases to the spacing B as shown in FIG.
At this time, the slip force between the spacing members 2 can be adjusted by adjusting the tightening force of the tightening bolt 51.
Further, since the friction force is increased by forming a bend in the length direction of the spacing member 2, a larger slip force can be expected.
Furthermore, in the present invention, since the slip force (interval holding force) is increased together with the slip amount between the interval holding members 2, slip does not concentrate only on a specific interval holding member 2, and the protective net The energy absorption effect can be maximized.
[0018]
【The invention's effect】
Since the rope spacing apparatus of the present invention is as described above, the following effects can be obtained.
<A> Space holding materials are arranged in an overlapping manner between ropes stretched in parallel to each other, and the overlapped space holding materials are tightened with a predetermined force to be frictionally connected. When operated, the gap retaining material slides against each other to open the gap between the ropes, so that the energy absorption effect of the protective net can be maximized and the impact force can be reduced to a minimum. Can do.
<B> Further, since the impact force can be suppressed to a small value, a highly rigid support or support structure is not required.
<C> When impact force such as falling rocks acts on the protective fence, the protective fence (net, rope) slips when the protective fence (net, rope) protrudes into the slope valley, so the upper and lower edges of the protective fence are in the middle of the fence Without decreasing the distance between the top and bottom of the protective fence.
<D> Since the spacing member is detachable with tightening bolts or holding bolts, the spacing member once slipped can be easily repaired or replaced.
[Brief description of the drawings]
FIG. 1 is a front view showing a spacing device of the present invention.
FIG. 2A is a front view of a spacing member. (B) is a side view of the spacing member.
FIG. 3 is a front view showing a part of the interval holding device, wherein (a) is before the start of slipping. (B) is a front view which shows after a slip start.
FIG. 4 is a diagram showing the relationship between the distance between the ropes and the distance holding force.
FIG. 5 is a perspective view in which an interval holding device is attached to a protective fence.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Space | interval holding device 2 ... Space | interval holding | maintenance material 21 ... Long hole 3 ... Holding bolt 4 ... Rope 5 ... Friction connection means 51 ... Clamping bolt 10 ... Guard fence 12 ...・ Protective net

Claims (6)

A rope spacing device stretched substantially parallel to each other,
A plurality of spacing members arranged to overlap each other between the ropes;
Holding bolts for fixing the spacing members to the rope;
A friction coupling means for frictionally coupling the overlapped spacing members with a predetermined force ;
When a force of a certain value or more acts on the spacing member, the spacing member slides against each other so as to open the spacing of the rope.
Rope spacing device.   2. The rope interval holding device according to claim 1, wherein an opening amount of the rope is limited to a predetermined value.   The rope interval holding device according to claim 1 or 2, wherein an opening amount of the rope is limited by a length of a long hole formed in a length direction of the interval holding material. Spacing device. In spacing means of the rope of any one of claims 1 to 3, the friction coupling means is composed of a bolt and nut fastening, tightening bolts elongated hole opened in the longitudinal direction of spacing material A rope interval holding device, wherein the interval holding member is tightened and frictionally connected by tightening the interval holding members with a nut. In spacing means of the rope of any one of claims 1 to 4, characterized in that by molding the superimposed surface spaced retention material such frictional force increases, spacing means of the rope. In spacing means of the rope of any one of claims 1 to 4, wherein the distance holding force is to be increased along with the sliding amount of the intervals between the holding member, spacing means of the rope.

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