JP3853192B2 - Rope shock absorber - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a shock absorber for a rope that can be applied to an impact-absorbing fence that absorbs an impact force such as falling rocks, avalanches, and collapsed sand and sand, rope guard rails, and the like.
[0002]
Conventional equipment
As a shock absorber for a rope constituting the shock absorbing fence, for example, Japanese Patent Laid-Open Nos. 6-57712 and 7-26527 are disclosed.
Both of these devices sandwich the rope material between two plates and fasten them with bolts, or press and hold them against the plates with bolts with wedge elements. The tension acting on the rope is attenuated by utilizing the frictional resistance of the gripping part that grips the rope.
[0003]
[Problems to be solved by the invention]
The conventional shock absorber has the following problems.
<A> Since the main body of the shock absorber is not suitable for cutting, it is made of cast iron.
For this reason, the shock absorber is heavy, such as several tens of kilometers, and requires a lot of labor for carrying and assembly.
<B> Since the shock absorber used for the rock fall protection fence is formed thick so that it can withstand the impact of a huge rock fall, not only the weight but also the manufacturing cost increases.
<C> In a type in which a rope is partially tightened with a bolt provided with a wedge element, since the contact area with the rope is small, the buffering performance is low although the fastening force of the bolt is large.
<D> When the shock absorber is a type that clamps the rope between the two plates, all bolts installed on both sides of the shock absorber body so as to straddle the rope should be used in order to exhibit the predetermined shock absorbing performance. It is necessary to conclude evenly.
However, it is difficult to tighten the bolts evenly, and the manufacturing tolerances of the shock absorbers are added, and the tightening force of the bolts on each side tends to vary.
In particular, the conventional shock absorber can evaluate the buffer performance only after an actual falling rock or the like acts, and the actual buffer performance cannot be confirmed immediately after the installation.
Therefore, there remains anxiety in terms of reliability with respect to stable buffer performance.
<E> In installation work in mountainous areas where it is difficult to carry in equipment such as compressors, bolts must be fastened with a simple tool such as a wrench or wrench.
If the bolt fastening operation is relied on manually, variations in the gripping force of the rope are more likely to occur.
[0004]
This invention is made | formed in view of the above point, The place made into the objective is to provide the following impact device for ropes.
(1) A rope shock absorber that can achieve both a reduction in size and weight and an increase in buffer performance.
(2) Rope shock absorber with excellent handling and assembly.
(3) Rope shock absorber with excellent manufacturability.
[0005]
[Means for Solving the Problems]
That is, the invention according to claim 1 is an apparatus for gripping the overlapping portions of a plurality of ropes on which a tensile force acts and attenuating the tensile force by a frictional resistance between the ropes, and folding the center of the plate body. A restraint plate having an extended portion formed so as to be able to be accommodated by being in surface contact with the peripheral surfaces of the plurality of ropes, and a fastening means for tightening the restraint plate in a contracting direction and bringing the extended portion into contact with each rope, The tightening force of the tightening means applied to the restraint plate is caused to act as an equal restraint force on each rope through the extension portion to fix the rope, and the friction resistance based on the restraint force of the extension portion of the restraint plate causes the A rope shock absorber characterized by attenuating a tensile force .
The invention according to claim 2, the tensile force holding the overlapped portion of a plurality of ropes that act, a device for damping the tension by frictional resistance between the ropes, the folded central plate body A constraining plate having an expansion portion formed so as to be able to be accommodated by being in surface contact with the peripheral surfaces of a plurality of ropes, and a partition that is inserted into the constraining plate and bisects the inner space of the expansion portion, thereby defining a rope accommodation space And a fastening means for tightening the restraint plate in the contraction direction and bringing the extension portion and the partition plate into contact with each rope, and the fastening force of the fastening means applied to the restraint plate is passed through the extension portion. The rope shock absorber is characterized in that the rope is fixed by acting as an equal restraining force on each rope, and the tensile force is attenuated by a frictional resistance based on the restraining force of the expansion portion of the restraining plate .
The invention according to claim 3 is the rope shock absorber according to claim 1 or 2, wherein the restraint plate is formed of a spring steel plate.
The invention according to claim 4 is the rope shock absorber according to claim 1 or 2, wherein the fastening means of the restraint plate is a plurality of bolts.
[0006]
DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1
Embodiments of the present invention will be described below with reference to the drawings.
[0007]
<A> Configuration of the shock absorber FIG. 1 is a perspective view of the shock absorber 10, and FIG. 2 is a cross-sectional view thereof.
The shock absorber 10 according to the present invention is a restraint that directly restrains the ropes A and B at the gathering portion of the ropes A and B on which tensile forces opposite to each other act, and accommodates the two ropes A and B. The restraint plate 20 includes a partition plate 30 interposed between the restraint plates 20 and fastening means for fastening both ends of the restraint plate 20.
[0008]
The ropes A and B include various ropes having excellent tensile strength such as wire ropes, PC strands, and PC steel bars.
In this example, the case where the tightening means is the bolt 40 and the nut 41 is shown, but the present invention is not limited to this, and a known means capable of tightening the end portion of the restraint plate 20 can be applied.
[0009]
<B> Restraint plate The restraint plate 20 is formed by bending a rectangular plate material, and the curved portion is formed by bending the center portion of the plate material into a horizontally long substantially oval (bulb shape). At the same time, the end of the extended portion 21 is bent outward, and the flat portions ahead of the bent portion 25 are formed as upright portions 22 and 22.
[0010]
A plurality of bolt holes 23 are formed in the upright portions 22 and 22 in accordance with bolt holes 31 provided in one horizontal row at a predetermined interval on one side of the partition plate 30.
The position where the bolt holes 23 and 31 are formed, that is, the position where the bolt is fastened, is preferably a position closer to the expansion portion 21 in consideration of the restraining effect of the restraining plate 20.
[0011]
As shown in FIG. 2, the inner space of the extension portion 21 is divided into two by a partition plate 30 to form two accommodation spaces 24 and 24 that individually accommodate the ropes A and B, respectively.
[0012]
The extended portion 21 will be described in more detail. The extended portion 21 has a bilaterally symmetric shape, and the curved portions 21a and 21a that can make surface contact with the peripheral surfaces of the ropes A and B, and these curved portions 21a and 21a. It consists of the connection part 21b which connects between.
The curved portion 21a is formed to be equal to or slightly larger than the radius of curvature of the ropes A and B so as to be in contact with the outer peripheral surface near half of the ropes A and B.
The constraining plate 20 is formed of a single plate because when the upright portions 22 and 22 of the expansion portion 21 are tightened with bolts 40, this tightening force is evenly constrained to the ropes A and B through the expansion portion 21. This is to make it act as a force.
Accordingly, the circumferential length of the expansion portion 21 is set to a dimension capable of restraining the ropes A and B when the upright portions 22 and 22 of the expansion portion 21 are tightened with the bolts 40.
[0013]
The length of the restraint plate 20 in the longitudinal direction (the direction parallel to the ropes A and B) and the number of bolts 40 are appropriately determined according to the rope diameter and the tensile force acting on the ropes A and B.
[0014]
The material of the constraining plate 20 can be various metal plates having high tensile strength, but is preferably formed of spring steel.
When the restraint plate 20 is formed of a single general steel plate, the ropes A and B can be restrained with an equal force, but the restraint force is determined only by the tightening force of the bolt 40, and torque management of each bolt 40 is performed. Must be done strictly.
If spring steel is used for the restraint plate 20, since the spring force inherent to the spring steel can be used in addition to the tightening force of the bolt 40, both ropes A and B can be restrained more firmly and elastically.
When spring steel is used for the restraint plate 20, even if there is some variation in the tightening force of each bolt 40, the spring force of the restraint plate 20 will alleviate this variation. On the other hand, it becomes possible to restrain with a stable force.
[0015]
<C> The partition plate 30 is a rigid body having a rectangular shape, and has a thickness several times that of the restraint plate 20.
The reason why the partition plate 30 is disposed in the restraint plate 20 is to avoid direct contact between the ropes A and B and to enhance the restraining effect of the ropes A and B by the restraint plate 20.
[0016]
In some cases, the end portion of the partition plate 30 may be integrated by being fixed to the inner surface of the extension portion by welding or the like, or the partition plate 30 may be omitted and the ropes A and B may be directly contacted to be restrained. .
[0017]
[Action]
Next, a method of using the shock absorber according to the present invention will be described.
[0018]
<A> The constraining plate 20 before fastening the assembly bolt is inserted into the expansion portion 21 through the opening between the upright portions 22 and 22 as shown by a one-dot chain line in FIG. Rope A and B are accommodated.
At this time, the partition plate 30 is positioned between the ropes A and B in the restraint plate 20.
[0019]
Next, the bolt 40 is inserted into the upright portions 22 and 22 of the restraint plate 20 and the bolt holes 23, 31 and 23 of the partition plate 30, and the nut 41 is screwed and tightened with a simple tool such as a spanner or a wrench. The peripheral surfaces of the ropes A and B are restrained with a predetermined force.
[0020]
Based on FIG. 3, the mechanism until the shock absorber 10 restrains the ropes A and B will be described in detail.
When a tightening force F directed toward the approaching direction of the partition plate 30 acts on the pair of upright portions 22, 22, the entire extended portion 21 of the restraint plate 20 is displaced in the approaching direction of the partition plate 30, and the ropes A, B The inner surface of the extended portion 21 and the side surface of the partition plate 30 are in contact with the peripheral surface.
A restraining force is not generated only by light contact.
[0021]
After that, when the tightening force F is continuously applied, the tightening force F acts as forces f ₁ and f ₁ that pull both curved portions 21 a and 21 a constituting the expansion portion 21 in the approaching direction of the partition plate 30. To do.
Because the constraining plate 20 are formed of a plate of one thing, both the curved portions 21a, traction f1, _{f 1} acting on 21a is Communicate each other, supported by a central 21d of the constraining plate 20 (contact portion 21b) Is done.
As a result, the restraining force of the ropes A and B gradually increases in a state where the expanding portion 21 of the restraining plate 20 is in surface contact with the side of the expanding portion 21 of the restraining plate 20 and the partition plate 30.
Thus, both ropes A and B can be restrained evenly and with a large force only by tightening one side (the upright portions 22 and 22) of the restraining plate 20.
[0022]
The bolt 40 is tightened until a predetermined restraining force is reached.
If the restraint plate 20 is formed so that the restraining force of the ropes A and B reaches a predetermined value when the upright portions 22 and 22 come into contact with the side surfaces of the partition plate 30, the troublesome fastening of the bolt 40 is performed. Torque management becomes unnecessary.
Further, the shock absorber 10 is small and light compared to a conventional cast iron shock absorber, which is a heavy object that extends over several tens of kilometers, and is easy to transport and assemble.
[0023]
<B> Buffering action The buffering action when a tensile force acts on the ropes A and B in the opposite directions will be described.
[0024]
When the tensile force acting on the ropes A and B is smaller than the frictional resistance based on the restraining force of the shock absorber 10 that restrains the ropes A and B, the relative force between the ropes A and B and the shock absorber 10 is relatively small. No sliding occurs.
[0025]
When the tensile force acting on the ropes A and B increases and exceeds the frictional resistance due to the restraining force of the shock absorber 10 that restrains the ropes A and B, the ropes A and B and the shock absorber 10 are relative to each other. Start sliding.
That is, the tensile force is attenuated by the frictional resistance of the contact portion with the expansion portion 21 of the restraint plate 20 that is in pressure contact with the peripheral surfaces of the ropes A and B and the contact portion with the side surface of the partition plate 30.
In particular, since the contact surfaces between the outer peripheral surfaces of the ropes A and B and the shock absorber 10 are formed over a wide range along the longitudinal direction of the rope, extremely high shock absorbing performance can be obtained by securing a large friction resistance surface.
[0026]
Second Embodiment of the Invention
Other embodiments will be described below. In the description, the same parts as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.
[0027]
As shown in FIG. 4, concave grooves 32 and 32 having arc-shaped cross sections that can accommodate the peripheral surfaces of the ropes A and B along the longitudinal direction of the partition plate 30 may be formed on both side surfaces of the partition plate 30. .
If the circumferential surfaces of the ropes A and B are accommodated and restrained in the concave grooves 32 and 32, the buffering performance of the shock absorber 10 is increased by the amount of increase in the contact area with the partition plate 30.
[0028]
Moreover, you may provide the resistance projection group of a dotted | punctate shape or a protrusion on either one or both of the constraining plate 20 which contacts with the surrounding surface of each rope A and B, and the scheduled contact surface of the partition plate 30.
[0029]
Embodiment 3 of the Invention
In the above-described embodiment, the case where a total of two ropes to be constrained has been described, but two or more ropes are accommodated in each of the accommodating spaces 24 and 24 in which the inner space of the expansion portion 21 is divided by the partition plate 30. And may be configured to be restrained.
[0030]
Embodiment 4 of the Invention
The restraint plate 20 may have a hinge structure that can rotate around the center of the extension portion 21.
[0031]
【The invention's effect】
The present invention can obtain the following effects.
<A> Since the restraint plate is formed of a single plate, it is possible to reduce the size and weight and reduce the cost as compared with the conventional cast iron.
<B> By tightening the end of the folded restraint plate, each rope can be restrained with an equal force, and a continuous contact surface along the length direction of the rope can be secured, so that high damping performance can be exhibited.
Therefore, as described above, not only the apparatus can be reduced in size and weight, but also the buffer performance can be improved.
<C> The shock absorber can be set with only a simple tool such as a spanner or wrench, and the assembly workability is good.
<D> When spring steel is used for the restraint plate, the spring force inherent to the spring steel can be used, so that variations in the tightening force can be alleviated and the rope can be firmly and elastically restrained.
Furthermore, there is no variation in restraining force, and stable damping performance can be exhibited.
[Brief description of the drawings]
FIG. 1 is a perspective view of a rope shock absorber according to the present invention. FIG. 2 is a cross-sectional view of the rope shock absorber. FIG. 3 is an explanatory view of the principle of restraint of each rope. Explanatory drawing of another embodiment with recesses [Explanation of symbols]
A, B Rope 10 Rope shock absorber 20 Restraint plate 21 Expansion portion 21a, 21a Bending portion 21b Connection portion 22, 22 Upright portion 23, 23 Bolt hole 24, 24 Housing space 30 Partition plate 40 Bolt 41 Nut

Claims (4)

A device that grips the overlapping portions of a plurality of ropes on which a tensile force acts, and attenuates the tensile force by a frictional resistance between the ropes ,
A constraining plate having an extended portion formed to be able to be accommodated by folding the center of the plate body into surface contact with the peripheral surfaces of the plurality of ropes ;
Tightening means for tightening the restraint plate in the shrinking direction and bringing the extended portion into contact with each rope,
Fixing the rope by applying the tightening force of the tightening means applied to the restraint plate as an equal restraint force to each rope through the expansion part,
The tensile force is attenuated by a frictional resistance based on the restraining force of the expansion portion of the restraining plate ,
Rope shock absorber. A device that grips the overlapping portions of a plurality of ropes on which a tensile force acts, and attenuates the tensile force by a frictional resistance between the ropes ,
A constraining plate having an extended portion formed to be able to be accommodated by folding the center of the plate body into surface contact with the peripheral surfaces of the plurality of ropes ;
A partition plate, which is inserted into the restraint plate and bisects the inner space of the expansion portion, and defines an accommodation space for the rope;
Tightening means for tightening the restraint plate in the shrinking direction and bringing the expansion portion and the partition plate into contact with each rope,
Fixing the rope by applying the tightening force of the tightening means applied to the restraint plate as an equal restraint force to each rope through the expansion part,
The tensile force is attenuated by a frictional resistance based on the restraining force of the expansion portion of the restraining plate ,
Rope shock absorber.   The rope shock absorber according to claim 1 or 2, wherein the restraint plate is formed of a spring steel plate.   The rope shock absorber according to claim 1 or 2, wherein the restraining plate tightening means is a plurality of bolts.

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