JP4459473B2 - Rope material gripping device for shock absorbing fence - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a shock-absorbing fence rope gripping device used for a rockfall protection fence, a guard rope, or the like, and relates to a rope gripping structure that is small and easy to attach and is effective for stably obtaining high energy absorption.
[0002]
[Prior art]
In order to absorb and receive the impact of falling rocks, etc. on the rock fall protection fences and guard ropes, for example, as shown in FIG. A method that absorbs energy by sliding friction resistance on the gripping surface of the horizontal rope material of the gripping metal has been adopted from the past. Has been.
Moreover, as shown in FIG. 9, the above-mentioned horizontal rope member is softly coupled with a plurality of vertical rope members using a cross-gripping bracket, and a method of absorbing energy by sliding frictional resistance of the softly coupled portion is also necessary. It has been adopted.
[0003]
As a gripping structure of the rope material so far, as shown in FIG. 11 (a), the rope material is sandwiched between the two metal plates 101 and 102 provided with the guide groove 111 of the rope material 130, or FIG. As shown in (b), the rope material is pinched by using a specially shaped locking member 113.
However, the rope member 30 generally provided for the shock absorbing fence is called a wire rope. As shown in FIG. 8, the strands 31 are twisted to form a strand 32, and several strands are further added to the heart rope 33. If the number of strands of strands and the number of strands are increased, it becomes a rope material with an outer shape closer to a circle, but it becomes a very expensive wire rope, so it is cheap and has high strand strength For example, as shown in FIG. 8, a strand having 3 strands × strands (1 + 6) is used.
Accordingly, since the outer cross-sectional shape is close to a triangle, in the structure in which the rope material is sandwiched between the two metal plates as shown in FIG. 11 (a), or in the structure in which the local area is sandwiched as shown in FIG. The metal plate abutting portion was close to a point, and the strands were cut by the local pressing force, or the pressing force was not constant and the gripping force of the rope material was varied, so that the energy could not be absorbed stably.
[0004]
In addition, there is a rope material gripping structure in which a bay portion 112 is provided in a holding groove of a metal plate as shown in FIG. 10, but in this case also, the rope material has an outer shape that is closer to a triangle than a circle and that is elongated in the longitudinal direction. However, since there was a round, there was a technical problem that could not be uniformly applied to the rope material.
Furthermore, when the rope member is attached, it is pressed locally, so a high torque is required, and a special part shape and tool are also required.
[0005]
[Problems to be solved by the invention]
In view of the above situation, the present invention is a shock absorbing fence rope material excellent in high energy absorption that provides stable sliding resistance by being able to easily attach a rope material to a holding bracket and impart a uniform pressing force. An object is to provide a gripping device.
[0006]
The present invention relates to a rope material gripping device for an impact-absorbing fence that absorbs an impact by allowing the rope material to slide when gripping the rope material and when the tension applied to the rope material exceeds a set value. A cross-sectional shape of the gripping groove of the box body, comprising a box body having a gripping groove into which the material can be inserted and a lid-shaped pressing tool having a plurality of protrusions that press the rope material facing the gripping groove of the box body The width dimension is smaller than the rope material outer dimension and the depth dimension is larger than the rope material circumscribed circle radius and smaller than the outer dimension. And is slidably held and fixed.
[0007]
In this way, a grip groove for inserting the rope material into the box is provided, and the rope material is configured to press the rope material against the grip groove with a plurality of protrusions provided on the pressing tool. Not only the bottom portion of the steel plate but also the side surfaces on both sides come into contact with the rope material and act so as to generate a stable frictional force.
[0008]
In the present invention , the rope material is made to contact the gripping groove more reliably and uniformly, and the width dimension of the cross-sectional shape of the gripping groove of the box is smaller than the outer dimension of the rope material, and the depth dimension is The rope material was set to be larger than the circumscribed circle radius and smaller than the outer dimension.
[0009]
Specifically, based on the cross-sectional shape example of the gripping groove shown in FIG. 2, since the depth dimension d is larger than the radius of the rope member 30, the center of the rope member is pressed when the rope member is press-fitted into the gripping groove. Is positioned closer to the inside of the groove than the upper end 11a of the gripping groove 11, so that the strands of the rope material do not protrude from the groove and are more securely abutted and gripped at the bottom of the gripping groove and the side surfaces on both sides. Act on.
In this case, the box body upper surface guide width dimension C forming the guide part of the rope material from the grip groove upper end 11a (pressing tool protrusion flank) to the box upper surface 1a is made larger than the rope material outer shape, and the R shape is formed. It is desirable to set it to 1b. By doing so, the press-fitting of the rope material becomes easier and the protruding of the strand can be prevented.
[0010]
In the present invention , in order to obtain a sliding resistance more stably, the protrusion rope material pressing surface of the pressing tool has a concave shape that wraps the rope material, and the arrangement interval of the plurality of protrusions is 1 of the rope material strand pitch. It may be set to be a multiple of / 2 .
[0011]
In this way, when pressing the rope material, the projection pressing surface 21a of the pressing tool 2 that directly contacts the rope material 30 is formed into a concave shape as shown in FIG. When pressing, the rope center acts so as to be in the center of the gripping groove, and the arrangement interval of the protrusions 21 is set to be 1/2 of the rope material strand pitch SP shown in FIG. When a predetermined tightening torque is applied to a fastening member composed of a bolt and a nut for fastening the pressing tool, a plurality of protrusions are uniformly pressurized.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
As shown in FIG. 1, the rope material gripping device E <b> 1 includes a box 1 that houses the rope material 30, and a pressing tool 2 and a box that have a plurality of protrusions 21 that press the rope material 30 housed in the box 1. And a bolt 3, a washer 4, and a nut 5 for fastening the pressing tool.
As shown in FIGS. 1 and 2, the box body 1 includes an attachment hole 13 for attaching the rope material gripping device to a column using U bolts, a gripping groove 11 for pressing the rope material, and a gripping groove. It has a guide groove 12 for guiding the rope material, a recessed escape portion 12a for escaping a plurality of protrusions of the pressing tool, and a hole for passing a bolt for pressing the pressing tool.
The grip groove width dimension a is made smaller than the outer diameter b of the storage rope material 30, the grip groove depth dimension d is made larger than the rope material radius, and the length is equal to or more than the strand pitch SP of the rope material (ideally doubled). However, the grip groove side surface and the outer diameter portion of the rope material are in constant contact with each other to generate a frictional force.
For example, when the outer diameter of the rope member is 18 mm, the grip groove width dimension is set to 15 mm, and the grip groove depth dimension is set to 10.5 mm.
The cross-sectional shape of the guide groove is easy to press the rope material, the entrance side is opened in a trumpet shape so that the strands of the rope material do not protrude, and the entrance has an R shape 1b. On the bolt insertion side of the box body 1, a detent protrusion 14 is provided that serves to prevent the bolt from rotating.
The pressing tool 2 is provided with a plurality of protrusions 21 on one side of a plate or block, and presses the rope material against the box. The protrusions 21 are arranged in the longitudinal direction of the rope material, and the pitch thereof is arranged in accordance with 1/2 of the strand pitch SP of the rope material. It is comprised from the bolt hole for pressing a pressing tool to this.
The protrusion 21 of the pressing tool 2 has a pressing surface 21 a set in a semicircular shape so that the direction of the acting force is directed toward the center of the rope material when pressing the rope material. As a result, the strands of rope material do not protrude outside the groove.
[0013]
The rope member 30 is accommodated in the gripping groove 11 of the box body 1, the pressing surface 21 a of the projection 21 of the pressing tool 2 is placed on the rope member, and the bolt 3 is attached from the back side of the box body to generate a pressing force. Thread, communicate with the pressing tool 2, and tighten with a washer 4 and a nut 5. At this time, the head of the bolt 3 hits the detent 14 and co-rotation is avoided.
The rope material is guided by the trumpet-shaped portion of the guide groove, and further, the rope material is pushed into the center portion of the groove by the semicircular pressing surface 21a of the protrusion 21 of the pressing tool 2. The gripping force of the rope material is determined by the tightening force of the nut 5 that presses the pressing tool 2.
When an impact force acts on the rope member 30 due to factors such as falling rocks or a collision of a traveling vehicle, the impact force acts on the rope member 30 as a tension, and this tension is transmitted to the rope member gripping device.
As shown in FIG. 1, the rope member 30 is gripped by the frictional resistance between the pressing surface 21 a of the protrusion 21 of the pressing tool 2 and the gripping groove 11 of the box 1. Accordingly, when the tension acting on the rope member 30 is equal to or less than the set frictional force, the rope member 30 does not slide.
When the tension acting on the rope member 30 exceeds the set friction force, the rope member 30 starts to slide, and the impact energy is effectively attenuated by the sliding friction resistance.
[0014]
FIG. 4 shows an example in which the gripping device according to the present invention is applied to a two-groove rope material gripping device E2 that grips two rope materials simultaneously.
The two-groove rope gripping device fastens the box 41 containing the rope material 30, the pressing tool 42 having a plurality of protrusions that press the rope material 30 stored in the box 41, and the box and the pressing tool. It comprises a bolt 43, a washer 44, and a nut 45.
The attachment hole 53 is a hole for attaching a gripping device using a U bolt.
The holding groove and the protrusion structure of the pressing tool are the same as E1.
[0015]
An example of a method of attaching the gripping device E1 or E2 according to the present invention will be described with reference to FIG. 3. A U-bolt 93 is passed through a bracket 82 welded to a support 81 and the rope member 30 is pressed and set on the U-bolt 93. The rope member 30 is tensioned by the washer 91 and the nut 92 through the attachment hole 13 of the gripping device E, and the rope member 30 is tensioned. Further, as shown in FIG. 5, there are a method of applying tension to the rope member through the U bolt to the anchor bolt bracket 83 and a method of supporting a stay such as a support as shown in FIG.
In this case, the stopper 35 is attached to the end of the rope material and grips the middle of the rope material.
[0016]
FIG. 7 shows an example in which the gripping device according to the present invention is applied to the cross gripping metal fitting E3 for gripping the horizontal rope 30 and the vertical rope 60 of the rock fall protection fence in a cross in FIG.
In this case, the upper plate 71 and the lower plate 72 are provided with the rope material gripping grooves 11 and the protrusions 21 corresponding to the pressing tools, respectively.
As shown in FIG. 9, this cross gripping metal fitting E3 is applied to the connecting portion of the horizontal rope material gripping device E1 and the horizontal rope material and the vertical rope material, and the gripping force F3 of the cross gripping metal fitting E3 is applied to the horizontal rope material gripping device E1. If it is set larger than the gripping force F1 and smaller than the cutting force F0 of the rope material, the rope material slides against the mutual frictional force, so that only a specific rope material slides and the horizontal rope material This works so that the grid of the vertical rope material will not become large, and as a result, the impact energy of the rock can be absorbed and received by the entire fence.
[0017]
【The invention's effect】
The present invention has the following effects from the structure and operation as described above.
Since the groove width is smaller than the outer diameter of the rope material and the energy is constantly absorbed by the friction of the entire side surface of the groove width, the impact can be absorbed with a small tightening torque. Therefore, the number and size of the fastening bolts can be greatly reduced as compared with the conventional metal fittings.
If the groove length is equal to or greater than the strand pitch and the arrangement of the protrusions of the pressing tool is set to ½ of the strand pitch, a stable tension can be obtained with a small friction surface by the pressing surface of the protrusions. Compared to tools, the size can be greatly reduced.
Therefore, as shown in FIG. 4, it is possible to adopt a two-groove gripping tool that cannot be put into practical use due to the increase in the size of the conventional gripping tool.
[0018]
By reducing the number of bolts, tightening torque, and reducing the weight of metal fittings, the number of work man-hours during construction is greatly reduced. Furthermore, material costs and construction costs can be greatly reduced as compared with the prior art. Moreover, since the tools at the time of construction can be handled by existing tools, no special expensive tools are required.
[Brief description of the drawings]
FIG. 1 shows a rope material gripping device according to the present invention, wherein (a) a front view and (b) a side view are shown.
FIG. 2 is a cross-sectional view of a rope material pressing portion of a box.
FIG. 3 shows an example in which a rope material is attached to a column using the rope material gripping device according to the present invention.
FIG. 4 shows a rope material gripping device according to the present invention of a two-groove type.
FIG. 5 shows an example in which a gripping device according to the present invention is attached to a natural ground or a concrete wall.
FIG. 6 shows an example applied to a support rope material for a net.
FIG. 7 shows an example in which the rope material gripping device according to the present invention is applied to a cross gripping metal fitting.
FIG. 8 shows a wire rope.
FIG. 9 shows an example in which the rope material gripping device according to the present invention is applied to a rock fall protection fence.
FIG. 10 shows a conventional gripping metal structure example.
FIG. 11 shows an example of another conventional gripping metal structure.
[Explanation of symbols]
E1 One-groove type gripping device E2 Two-groove type gripping device E3 Cross gripping bracket 1 Box 1a Box top 1b Box top guide groove R
11 Grasping groove 11a Grasping groove upper end 12 Guide groove 12a Relief part 2 of pressing tool projection part Pressing tool 21 Pressing tool projection part 21a Pressing tool projection part pressing surface 3 Box body and pressing tool fastening bolt 4 Box body and pressing tool fastening washer 5 Box body and pressing tool fastening nut 30 Rope material 31 Strand 32 Strand 33 Core rope 34 Reinforcement wire 35 Stopper 60 Rope material (vertical rope material)
a grip groove width dimension b rope material outer diameter c guide groove opening dimension d grip groove depth dimension 41 two groove box body 42 two groove pressing tool 43 two groove bolt 44 two groove washer 45 two Groove nut 53 Two-groove box mounting hole 81 Post 82 Mounting bracket 83 Anchor bolt bracket 91 U bolt mounting washer 92 U bolt mounting nut 93 U bolt SP Strand pitch

Claims (2)

The rope material can be inserted into the rope material gripping device for the shock absorbing fence that absorbs the impact by allowing the rope material to slide when the rope material is gripped and the rope material is subjected to tension higher than the setting. A box having a gripping groove and a lid-like pressing tool having a plurality of protrusions that press the rope material opposite the gripping groove of the box,
The width dimension of the cross-sectional shape of the gripping groove of the box is set smaller than the outer dimension of the rope material and the depth dimension is set larger than the circumscribed radius of the rope material and smaller than the outer dimension.
A rope material gripping device for an impact absorbing fence, wherein the rope material is slidably gripped and fixed with a tension of a predetermined level or more between the gripping groove of the box and the pressing tool. Claims projections rope materials pressing surface of the pressing member is made of a concave shape encasing rope materials, arrangement intervals of the plurality of protrusions, characterized in that set to be 1/2 of the multiple of the rope material strand pitch Item 1. A rope material gripping device for an impact absorbing fence according to Item 1 .

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