WO2023281734A1

WO2023281734A1 - Falling rock protection fence

Info

Publication number: WO2023281734A1
Application number: PCT/JP2021/025966
Authority: WO
Inventors: 謙一郎難波; 毅有田
Original assignee: 東京製綱株式会社
Priority date: 2021-07-09
Filing date: 2021-07-09
Publication date: 2023-01-12

Abstract

Provided is a falling rock protection fence in which cables such as wire ropes for catching falling rocks and the like are disposed near the center of the protection fence, wherein the ability of the protection fence to disperse impact energy of falling rocks and the like can be improved due to the fence having, inter alia, a new installation structure for the cables.　The falling rock protection fence 1, which prevents falling rocks and the like, comprises: terminal struts 11 erected at both ends; and crisscrossing cables 13 arranged between the terminal struts 11, the cables including falling rock receiving parts 131 stretched laterally between the terminal struts 11 and folded parts 132 folded near the terminal struts 11, and the cables being disposed in a crisscrossing formation due to the falling rock receiving parts 131 and the folded parts 132 being successively repeated in the vertical direction.

Description

Falling rock protection fence

The present invention relates to a rockfall protection fence for preventing rockfall and the like.

2. Description of the Related Art Conventionally, for example, rockfall protection fences have been installed in order to prevent rockfall accidents that occur in mines, and to protect roads, houses, etc., from falling rocks on slopes and the like.
A general rockfall protection fence has a structure in which an upper member composed of posts, wire ropes, and wire netting is supported by a concrete foundation.
Japanese Patent Laid-Open No. 2002-200001 discloses a conventional technique related to such a falling rock protection fence.

Japanese Patent No. 6523075

According to the technology disclosed in Patent Document 1, while reducing the wire rope near the center of the protective fence by using a high-strength wire mesh, the rectangular shape ( By adopting a configuration in which a ring-like cord is arranged in a ring, when an impact such as a falling rock is applied, the energy can be dispersed and the energy of the falling rock can be absorbed more effectively. It is a thing that can obtain the function and effect.
On the other hand, in the case of conventional rockfall protection fences, wire ropes are placed near the center of the protection fence (all over the protection fence) and the wire rope has the function of receiving falling rocks. It has a configuration to be fastened to a support. That is, each wire rope is basically independent, and when a certain wire rope receives an impact such as falling rocks, the ability to disperse energy due to the impact is also limited to the range of the wire rope. rice field.

The present invention provides a rockfall protective fence in which a rope such as a wire rope for receiving falling rocks is arranged near the center of the protective fence. To provide a falling rock protection fence capable of improving

(Configuration 1)
A rockfall protection fence for preventing falling rocks, etc., comprising end posts erected at both ends and a cable body disposed between the end posts, falling rocks stretched laterally between the end posts. a serpentine arrangement cable body comprising a receiving portion and a folded portion folded back near the terminal post, wherein the falling rock receiving portion and the folded portion are sequentially repeated in a plurality of times in the vertical direction, thereby serpentinely arranged; Falling rock protection fence characterized by comprising.

(Configuration 2)
The falling rock protection fence according to Configuration 1, wherein the meandering cable is slidably provided through the terminal post.

(Composition 3)
A falling rock protection fence according to configuration 2, wherein a guide member that slidably guides the folded portion is provided outside the terminal post so as to be detachable from the terminal post.

(Composition 4)
A falling rock protection fence according to configuration 2, wherein a guide member for slidably guiding said folded portion is attached to an auxiliary post provided outside said terminal post.

(Composition 5)
The rockfall protection fence according to configuration 3 or 4, wherein the guide member is provided with an energy absorbing function by being deformed when collision energy due to rockfall is applied.

(Composition 6)
Further comprising a rhombus wire net, the rhombus wire net is arranged so that the row lines forming the rhombus wire net are arranged in a horizontal direction, and the falling rock receiving part is inserted through the inside of the row line along the longitudinal direction of the row line. 6. The falling rock protection fence according to any one of configurations 1 to 5, characterized in that the rhombic wire mesh is held by being held.

(Composition 7)
The falling rock protection fence according to configuration 6, wherein the thickness of the rhombic wire mesh is 20 mm to 70 mm due to the fact that the row lines are formed in a spiral shape having a thickness.

(Composition 8)
8. The falling rock protection fence according to any one of configurations 1 to 7, wherein a plurality of said meanderingly arranged ropes are provided, and said falling rock receivers provided in each meanderingly arranged rope are arranged in order in the vertical direction.

(Composition 9)
9. The configuration according to any one of configurations 1 to 8, further comprising an intermediate strut provided between the terminal struts, wherein the meanderingly arranged cable is provided slidably with respect to the intermediate strut. Rockfall protection fence.

According to the rockfall protection fence of the present invention, the rockfall protection fence, in which a rope such as a wire rope for receiving falling rocks, etc. is arranged near the center of the protection fence, has a new installation structure for the ropes, thereby preventing falling rocks, etc. It is possible to improve the dispersing ability of impact energy.

BRIEF DESCRIPTION OF THE DRAWINGS The figure which shows typically the rockfall protection fence of Embodiment 1 which concerns on this invention. A diagram schematically showing a state in which a cable is passed through the wire mesh. A diagram schematically showing one terminal strut part A diagram schematically showing an example of a guide member The figure which shows typically the falling rock protection fence of Embodiment 2. The figure which shows the guide member of Embodiment 2 typically. The figure which shows typically the attachment state of the guide member of Embodiment 2.

Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings. It should be noted that the following embodiment is one mode for embodying the present invention, and does not limit the scope of the present invention.

<Embodiment 1>
FIG. 1 is a front view schematically showing a falling rock protection fence according to Embodiment 1 of the present invention.
In the following explanation, the longitudinal direction of the rockfall protection fence (horizontal direction in Fig. 1) is the "horizontal direction", the direction along the erected support (vertical direction in Fig. 1) is the "vertical direction", and the horizontal and A direction orthogonal to the vertical direction (a direction orthogonal to the plane of the paper in FIG. 1) is referred to as a "thickness direction".
The rockfall protection fence 1 of the present embodiment is a rockfall protection fence used for preventing rockfall accidents that occur in mines, for example,
terminal supports 11 erected at both ends;
A rope body (wire rope) arranged between the terminal struts 11, comprising a falling rock receiving portion 131 stretched horizontally between the terminal struts 11, and a folded portion 132 folded near the terminal struts 11. and a meandering arrangement cable body 13 arranged in a meandering manner by repeating a plurality of falling rock receiving parts 131 and folding parts 132 sequentially in the vertical direction;
a guide member 15 that slidably guides the folded portion 132 of the meandering arrangement cable 13 outside the terminal post 11;
A wire mesh 14 which is a rhombus wire mesh and is arranged so that the row lines constituting the rhombus wire mesh are in the horizontal direction;
intermediate struts 12 provided between the terminal struts 11;
a traction cord body 16 that supports the terminal strut 11;
have

In the present embodiment, the terminal post 11 is made of a steel pipe, and erected by being erected against a sheath pipe 19 driven into the ground. The sheath tube 19 is a steel tube having an inner diameter slightly larger than the outer diameter of the terminal strut 11 .
The intermediate struts 12 of this embodiment have the same specifications as the terminal struts 11, and are erected in the sheath tube 19 in the same manner as the terminal struts 11. As shown in FIG.
In setting into the sheath tube 19, the inside of the sheath tube 19 (and the inside of the terminal struts 11 and the intermediate struts 12) may be filled with a filler such as cement milk.
As described above, the rockfall protection fence 1 of the present embodiment is designed to reduce the cost of installing the rockfall protection fence and shorten the construction period by erecting the support posts in the sheath pipe method. In the case of a conventional structure in which the columns are supported by a concrete foundation, it takes time and money to cast and cure the concrete foundation. It is something that can be done.
In addition, in the rockfall protection fence provided with the "meandering arrangement cord body" which concerns on this invention, the structure which supports a support|pillar with a concrete foundation may be employ|adopted. Further, the end struts 11 or the intermediate struts 12 are not limited to steel pipes, and may be made of, for example, H-shaped steel.

The meandering cable 13 is composed of one wire rope in this embodiment.
The meandering cable 13 is provided so as to pass through the terminal struts 11 and the intermediate struts 12, and the terminal struts 11 and the intermediate struts 12 are formed with through-holes through which the meandering cable 13 is inserted. . The meandering cable 13 is simply passed through the through holes of the terminal support 11 and the intermediate support 12 , and the meandering cable 13 is slidable relative to the terminal support 11 and the intermediate support 12 . It should be noted that the through-holes formed in the pillars are preferably beveled (chamfered).
As shown in FIG. 1, the meandering cable 13 is a wire rope meandering in the vertical direction. When viewed from the uppermost stage, a cable for preventing the meandering cable 13 from slipping out of a through hole formed in the terminal post 11 is provided at one end of the meandering cable 13 (upper left in FIG. 1). A stopper 13E is provided. The cable stopper can be configured by terminal processing of various wire ropes. The meandering cable 13 continuing from the cable stopper 13E at one end penetrates the intermediate support 12 and the terminal support 11 and is stretched in the horizontal direction of the rockfall protection fence 1. A part 131 is configured. The meandering cable 13 that penetrates the terminal support 11 and reaches the outside of the terminal support 11 is turned back there and moved to the lower stage side. The folded portion 132 is configured by the folded portion. After that, the "falling rock receiving part" extending in the lateral direction of the rockfall protection fence 1 through the intermediate post 12 and the terminal post 11 and the "folding part" folding back on the outside of the terminal post 11 are repeated multiple times in sequence. As a result, the wire ropes are arranged downward in a plurality of stages, thereby arranging the meanderingly arranged ropes 13 in a meandering manner. A cable stopper 13E is provided at the other end of the meandering cable 13 (lower right side in FIG. 1).
Here, one example is from the upper left side to the lower right side, but the arrangement relationship between the start point and the end point of the meandering arranged cord body 13 can be any of the upper left side, the lower left side, the upper right side, and the lower right side. may be a combination of As will be explained later, when a plurality of meandering cords are provided, the starting point or the end point of the meandering cords is not limited to the upper left side, the lower left side, the upper right side, and the lower right side. may be located.

In the present embodiment, the wire netting 14 is a rhombic wire netting having a thickness of 30 mm due to the column lines being formed in a spiral shape having a thickness.
The wire nettings 14 are arranged so that the row lines forming the rhombic wire netting are arranged in the lateral direction (substantially horizontal direction) between the terminal struts 11 and the intermediate struts 12 adjacent to each other or between the intermediate struts 12 adjacent to each other. The wire mesh 14 is supported by passing the meandering cable 13 through the inside of the column wire. In addition, in general protective fences, etc., it is normal to arrange so that a row line may become an up-down direction.
FIG. 2 schematically shows a state in which the meandering cable 13 is passed through the column lines of the wire mesh 14 . This figure is a cross-sectional view of the wire mesh, and is a view along the longitudinal direction (that is, lateral direction) of the falling rock receiving portion 131 of the meandering cable 13 . In FIG. 2, the spiral is schematically shown to be hexagonal, and five column lines are shown.
As understood from FIG. 2, each falling rock receiving portion 131 is arranged so as to pass through the inside of one row line. The wire mesh 14 is configured to be supported by the meanderingly arranged ropes 13 by passing the meanderingly arranged ropes 13 through the column lines. At the same time, each falling rock receiving portion 131 of the meandering cable 13 passes through the row line of the wire netting 14, so that the vertical relative position of each falling rock receiving portion 131 is held by the wire netting 14. .
In conventional rockfall protection fences, when a falling rock collides, the gap between the wire ropes widens and the falling rock does not slip through, so that the gap between the wire ropes is maintained, and a mounting structure for that is required. . Moreover, a mounting member for providing the wire mesh is also required.
On the other hand, the rockfall protection fence 1 of the present embodiment does not require a separate member for attaching the wire net 14 to the rockfall protection fence 1 or the space holding material for holding the space between the wire ropes due to the above configuration. , a rockfall protection fence can be configured at low cost. In addition, since there is no need to install various parts, the construction period can be shortened.

FIG. 3 is a diagram schematically showing one terminal strut 11 portion.
The guide member 15 is a member that slidably guides the folded portion 132 of the meandering arrangement cable 13, and guides the wire rope in an arc shape so that the curvature of the folded portion 132 does not locally increase. It is a holding member. The guide member 15 in this embodiment is composed of a steel strip processed into an arc shape or a steel pipe divided into halves. installed in an intermediate position.
As will be exemplified below, the guide member 15 can also be configured by a thimble or the like so as to have an arc-shaped outer periphery with a groove-shaped recess for receiving the wire rope in the outer periphery.
The guide member 15 may be a member that deforms when impact energy (energy defined as design specifications) due to falling rocks is applied. For example, when collision energy is applied, the arc-shaped portion may be deformed so as to be crushed. It is possible to absorb collision energy due to falling rocks by the deformation, and therefore the guide member 15 of this embodiment has an energy absorbing function. It should be noted that the "energy defined as a design specification" here means the energy absorbed by the guide member 15 and the like due to deformation of the guide member 15 and the like. It is smaller than the energy that can be received as a fence specification).
The guide member 15 is detachably attached to the terminal post 11 . Any conventional mounting method (for example, bolting, etc.) can be used for the structure to be detachably attached to the terminal post 11 .

FIGS. 4A and 4B schematically show another example of a guide member which is detachably attached to the terminal post 11. FIG.
The guide member 15a shown in FIG. 4A is an example of using a round thimble as the arc-shaped outer peripheral portion having the concave portion. A round thimble is an annular member having a recessed portion on its outer peripheral surface, and it is assumed that the annular member is deformed so as to be crushed when collision energy due to falling rocks is applied. The round thimble need not be rotatable with respect to the terminal post 11, but may be rotatable.
The guide member 15b of FIG. 4(b) is an example of one using a sheave (pulley) as the circular arc-shaped outer peripheral portion having the concave portion. A structure for holding the rotating shaft of the sheave is detachably provided with respect to the terminal strut 11 . In the structure for holding the rotating shaft, an energy absorption function may be imparted by using a member that deforms when impact energy due to falling rocks is applied.

FIG. 4(c) shows an example in which an auxiliary strut is provided for supporting the guide member.
The auxiliary strut 17 is provided outside the terminal strut and has a guide member 15c attached thereto. In this example, a pulley is used as the guide member. Further, here, the auxiliary post 17 is driven into the ground and attached to the terminal post 11 by the support member 171 as an example.
Any one or any combination of the pulley and its mounting structure that constitute the guide member 15c, the auxiliary strut 17, and the support member 171 is a member that deforms when impact energy due to falling rocks is applied, so that these members You may make it have an energy absorption function.

The traction cable 16 has a function of supporting the terminal strut 11 against the moment acting to tilt the terminal strut 11 inward when impact energy due to falling rocks is applied.
One end of the traction cable 16 is attached near the upper portion of the terminal support 11, and the other end is attached to an anchor 18 driven into the ground. Any conventionally used mounting members and methods can be used as the members and methods for mounting to the terminal post 11 and to the anchors 18 .

According to the falling rock protection fence 1 of this embodiment having the above configuration, it is possible to improve the ability to disperse the impact energy of falling rocks and the like by having a cable installation structure that has not existed in the past.
That is, as can be understood from FIG. 1, the meanderingly arranged ropes 13 are arranged in a meandering manner so that the meanderingly arranged ropes 13 are provided continuously with respect to the falling rock protection fence 1 over the entire surface. Therefore, impact energy is easily dispersed and transmitted to the entire rockfall protection fence 1 . Since the energy is propagated over a wide range and concentration of stress on a specific point is suppressed, damage to the facility is suppressed. As a result, even if the rockfall protection fence 1 of the present embodiment is of a size or material that is likely to be damaged in the past, it can be prevented from being damaged. It has and is very useful.

In addition, as described above, by providing the guide member with an energy absorption function and detachably providing the guide member, it is possible to efficiently and quickly repair the fence in the event of falling rocks. .
In other words, it is possible to make the guide member the part that is damaged first when a rock falls, and by making this a replaceable structure, it is possible to carry out repairs efficiently and quickly. is.

In addition, in the rockfall protection fence 1 of the present embodiment, as described above, the pillars are of the sheath tube type, separate members for attaching the wire nets, and spacing materials for retaining the spacing of the wire ropes. are not required (the number of parts is greatly reduced), etc., it is possible to obtain excellent effects such as cost reduction and shortening of the construction period.
In addition, in the installation of the conventional falling rock protection fence, work was performed to cut the wire rope on site according to the span of the falling rock protection fence, but according to the rock falling protection fence 1 of this embodiment, such work can be reduced.

In this embodiment, the wire mesh has a thickness of 30 mm as an example, and such a thickness provides excellent workability when passing the meandering cable members through the row lines. be. From this point of view, the thickness of the wire mesh is preferably 20 mm to 70 mm. Therefore, it is not essential to use a wire mesh with a thickness of 20 mm to 70 mm in the rockfall protection fence provided with the "meandering cable" according to the present invention.

In addition, in this embodiment, it is assumed that the column lines forming the rhombic wire mesh are arranged in the lateral direction (substantially horizontal direction). According to this configuration, as described above, workability is excellent when the meanderingly arranged rope is passed through the row lines of the wire netting, and the meanderingly arranged rope is passed through the row line, whereby the meanderingly arranged rope is passed through the row line. This is preferable because the wire mesh supported by the body is highly stable, but the present invention is not limited to this. Even when the wire netting is arranged so that the row lines are in the vertical direction (vertical direction), it is possible to arrange the meanderingly arranged cords so as to pass through (or sew) the inside of the wire netting in the horizontal direction.

<Embodiment 2>
FIG. 5 is a front view schematically showing the falling rock protection fence of Embodiment 2. FIG.
The same reference numerals are used for the same configuration as in the first embodiment, and the description here is simplified or omitted.

The falling rock protection fence 1' of this embodiment includes a plurality of meanderingly arranged ropes, and the falling rock receivers of each meanderingly arranged rope are arranged in order in the vertical direction.
Specifically, two meanderingly arranged

cords

13a and 13b are provided, and each of them meanders based on the same concept as the meanderingly arranged cords 13 described in the first embodiment. are provided in the form of In addition, in FIG. 5, in order to facilitate the distinction between the meanderingly arranged cords 13a and the meanderingly arranged cords 13b, they are drawn as one-dot chain lines and two-dot chain lines, respectively.

FIG. 6 is a front view schematically showing the guide member 15' of this embodiment. The guide member 15' is a member that slidably guides the folded portion of the meandering arrangement cable as in the first embodiment. The guide member 15' of this embodiment is constructed using a steel strip (or steel plate) and has an arc-shaped portion 152 that is approximately semicircular and insertion portions 151 at both ends of the arc-shaped portion 152. As shown in FIG. A hole for receiving the insertion portion 151 is formed in the column 11, and the guide member 15' is attached to the column 11 by inserting the insertion portions 151 at both ends of the guide member 15' into the holes. . The insertion portion 151 inserted into the support 11 is provided so that its tip abuts against the inner wall of the support 11 (the inner wall surface facing the hole for receiving the insertion portion 151).
With such a configuration, the guide member itself and the mounting structure of the guide member to the strut can be simplified and the cost can be reduced. In addition, the construction described above eliminates the need for welding, etc., and thus simplifies the installation work of the falling rock protection fence. At the same time, workability is excellent even in the work of exchanging the deformed guide member after catching falling rocks.
The guide member 15' of this embodiment is formed by bending a steel strip (or steel plate) having a thickness of 4.5 mm, a width of 56 mm, and a length of 610 mm.

FIG. 7 is a schematic diagram showing the mounting state of the guide member 15', and the mounting portion of the guide member 15' (that is, the FIG. 10 is a diagram showing a folded portion of a meandering arrangement cable).
In this embodiment, two meandering arranged

ropes

13a and 13b are provided. (45° in this embodiment), and the installation angles of adjacent guide members 15' are in alternate directions. In order to achieve this configuration, the hole for receiving the insertion portion 151 provided in the column 11 is formed at a position shifted by a predetermined angle with respect to the horizontal direction. Along with this, holes for inserting the meandering cable are also formed at positions shifted by a predetermined angle with respect to the lateral direction.

As shown in FIG. 5, falling rock receiving portions (portions extending in the lateral direction) of meanderingly arranged ropes 13a and meanderingly arranged ropes 13b are arranged alternately in the vertical direction. As a result, the distance between the falling rock receivers of the meandering cable 13a and the distance between the falling rock receivers of the meandering cable 13b can be increased without increasing the vertical arrangement intervals of the ropes (wire ropes) of the rockfall protection fence. The spacing can be prevented from becoming too narrow.
If the interval between the falling rock receiving parts becomes narrower, the curvature of the rope at the folded part becomes larger (the radius of curvature becomes smaller). According to the falling rock protection fence 1', such a problem can be solved.

As described above, according to the rockfall protection fence 1' of the present embodiment, the same effect as that of the first embodiment can be obtained, and the vertical arrangement interval of the ropes (wire ropes) of the rockfall protection fence can be narrowed. Even in such a case, it is possible to prevent the curvature from becoming large (the radius of curvature from becoming small) at the folded portion of the cord.
In this embodiment, two meandering cords are used as an example, but the present invention is not limited to this, and three or more cords may be used.

In each embodiment, the meanderingly arranged cords are provided through the terminal struts and the intermediate struts as an example, but the present invention is not limited to this, and the cords can be slidably held. Any method of attachment to the stanchion that permits it may be used (eg, using U-brackets, etc.). However, since a separate mounting member or the like is not required by passing the meandering cable through a hole formed in the post, the configuration of the embodiment is more preferable from the viewpoint of reducing the number of parts. Further, as for the terminal post, it is more preferable to have a configuration in which the meandering cable is passed through a hole formed in the post and folded back. For example, it is possible to adopt the configuration of attaching the guide member to the auxiliary column shown in FIG. However, in this case, it is necessary to give the guide members and their mounting members the strength (strength required as a rockfall protection fence specification) that will not be damaged even when the impact energy of falling rocks is applied. (Because the strength of the part becomes a bottleneck), the cost becomes high. Therefore, as for the terminal support, it is more preferable to have a configuration in which the meanderingly arranged cable is slidably supported by passing the meanderingly arranged cable through a hole formed in the support.

In each embodiment, an intermediate support is provided as an example. However, depending on the situation at the site where the rockfall protection fence is installed, if the span of the rockfall protection fence is not so large, the intermediate support is not provided. It may be something that
In addition, in the embodiment, a traction cable is provided to reinforce the terminal support. There may be. Further, instead of the traction cable body, a support strut for reinforcing the terminal strut may be provided.

1. . . Falling rock protection fence 11. . . terminal strut 12 . . . Intermediate strut 13 . . . Serpentine arrangement cord body 131 . . . Falling rock receiver 132 . . . Folding part 14 . . . Wire mesh (rhombus wire mesh)
15. . . Guide member 17 . . . Auxiliary strut

Claims

A falling rock protection fence for preventing falling rocks, etc.,
Terminal supports erected at both ends;
A rope arranged between the terminal struts, comprising a falling rock receiving portion stretched in a horizontal direction between the terminal struts, and a folded portion folded back near the terminal struts, wherein the falling rock receiving portion and a serpentine arrangement cord arranged in a serpentine manner by repeating a plurality of the folded portions sequentially in the vertical direction;
Falling rock protection fence characterized by comprising.
The falling rock protection fence according to claim 1, characterized in that said meandering cable is slidably provided through said terminal post.
The falling rock protection fence according to claim 2, wherein a guide member that slidably guides the folded portion is provided on the outside of the terminal support so that it can be attached to and detached from the terminal support.
The falling rock protection fence according to claim 2, wherein a guide member that slidably guides the folded portion is attached to an auxiliary post provided outside the terminal post.
The falling rock protection fence according to claim 3 or 4, characterized in that the guide member has an energy absorbing function by being deformed when collision energy due to falling rocks is applied.
Equipped with a diamond wire mesh,
The rhombus wire mesh is arranged so that the row lines constituting the rhombus wire mesh are in the horizontal direction,
6. Any one of claims 1 to 5, wherein the rhombic wire mesh is held by the falling rock receiving portion being inserted through the inside of the row line along the longitudinal direction of the row line. Falling rock protection fence described.
The falling rock protection fence according to claim 6, characterized in that the thickness of the rhombic wire mesh is 20 mm to 70 mm due to the fact that the row lines are formed in a spiral shape having a thickness.
A falling rock protection fence according to any one of claims 1 to 7, wherein a plurality of said meanderingly arranged ropes are provided, and said falling rock receivers provided in each meanderingly arranged rope are arranged in order in the vertical direction. .
Further comprising an intermediate strut provided between the terminal struts,
The falling rock protection fence according to any one of claims 1 to 8, wherein the meandering cable is provided slidably with respect to the intermediate post.