JP6947404B2 - Elevation structure of upper chord material in guard fence - Google Patents

Description

The present invention relates to a guard fence capable of dealing with collapsed objects such as rockfalls, landslides, and avalanches, and more particularly to an erection structure of an upper chord member in a guard fence having an improved rotary connection mechanism.

Patent Document 1 discloses a protective fence generally called a "loop fence", which includes a protective loop in which a rope material is wound in a loop shape between the peripheral surfaces of adjacent columns and laid horizontally in multiple stages.
Explaining this guard fence with reference to FIG. 8A, the rope material wound in a loop shape is tightened when the protective loop 30 is laid horizontally between the peripheral surfaces of the adjacent columns 10, but the rope material is used. When tightening, adjacent columns 10 may be attracted to each other and tilt.
Therefore, before the horizontal work of the protective loop 30, the upper chord member 20 is laid between the heads of the adjacent columns 10 to keep the distance between the columns 10 constant.
Further, a spacing member 40 is hung on the upper chord member 20, and the intersection of the strip of the spacing member 40 extending vertically and the protective loop 30 laid in multiple stages is fixed to increase the vertical spacing of the protective loop 30. It is kept constant.
It is also known that the interval holding material 40 has a chain applied to the portion of the strip that extends vertically, and the intersection of each chain that hangs down on the upper chord member 20 and extends vertically and the protective loop 30 that is horizontally laid in multiple stages. Is fixed.

The guard fence provided with the upper chord member 20 incorporates a knuckle-type rotary connecting mechanism 60 between the head of the support column 10 and the end of the upper chord member 20 so that it can be assembled in response to undulations on a slope or the like. , The upper chord member 20 is connected so as to swing.
Explaining the conventional rotary connection mechanism 60 with reference to FIG. 8B, a head cap 13 is provided on the head of the support column 10. An end cylinder 62 containing a hemisphere 61 is exteriorized at the end of the upper chord member 20.
The structure is such that the head cap 13 is sandwiched between the two hemispheres 61 arranged so as to face each other and connected by a single support shaft bolt 63 that is horizontally penetrated.

Further, Patent Document 2 discloses a protective fence in which a rotary connecting mechanism is provided on a side portion of a support column so that the upper chord member can swing in the front-rear direction and the up-down direction.

Japanese Unexamined Patent Publication No. 2003-184835 Japanese Unexamined Patent Publication No. 2003-34912

A guard fence provided with a conventional rotary connection mechanism has the following problems.
<1> The rotary connecting mechanism 60 described in Patent Document 1 has a large number of component parts, and it takes a lot of time and effort to assemble, and there is room for improvement.
<2> Further, in the rotary connecting mechanism 60 described in Patent Document 1, since the swing angle of the upper chord member 20 with respect to the support column 10 is small, it is difficult to construct the guard fence by bending it greatly in a flat “dogleg” shape. Is.
<3> When the guard fence described in Patent Document 1 is bent greatly in a flat "dogleg" shape, not only an unnecessary rotational force is generated on the support column 10, but also the straight portion of the protection loop 30 and the upper chord member 20 are formed. Due to the twisting relationship, it becomes difficult to fix the intersection of the spacing member 40 and the protective loop 30.
Further, a twisting force acts on the protective loop 30 and the spacing member 40, which may adversely affect the impact absorbing action of the protective loop 30.
<4> Even if the chain is applied to the spacing member 40, if the guard fence is bent greatly in a flat "dogleg" shape, the upper chord member 20 and the guard loop 30 will be in a twisted positional relationship. , The distance from the upper chord member 20 to the mountain side and the valley side of the uppermost protective loop 30 gradually changes.
If the distance from the upper chord member 20 to the protective loop 30 changes depending on the hanging position, not only is it difficult to fix the intersection of the chain-made spacing member 40 and the protective loop 30, but also the distance to the protective loop 30 is increased. Since the shorter chain is loosened, the vertical distance between the protective loops 30 cannot be kept constant.
<5> Since the rotation connecting mechanism described in Patent Document 2 does not change the formation interval of the vertically oriented support shafts arranged side by side on the outside of the column, when applied to the guard fence described in Patent Document 1, the above-mentioned The same problem as <2> occurs.

The present invention has been made in view of the above points, and an object of the present invention is to provide an erection structure of an upper chord member in at least one of the following guard fences.
<1> The rotation connection mechanism can be simplified and the swing range of the upper chord material with respect to the head of the strut can be expanded.
<2> The assembly work of the rotary connecting mechanism is easy.
<3> Even if the upper chord members adjacent to the column are bent and connected, the work of fixing the intersection of the spacing member and the protective loop is easy, and the impact absorption action of the protective loop is not adversely affected.

In the present invention, a rope material is wound in a loop between the peripheral surfaces of adjacent columns, and a plurality of protective loops are laid horizontally in multiple stages, and between the heads of adjacent columns via a rotation connecting mechanism. It is an erection structure of the upper chord material in a protective fence provided with a plurality of upper chord members that are laid horizontally and keep the strut spacing constant, and an interval holding material that is hung on the upper chord material and keeps the vertical spacing of the protective loop constant. The rotary connecting mechanism is mounted on the top surface of the column, and is composed of a plurality of plywood plates individually rotatably and pivotally supported around the central axis of the column, and are adjacent to the column. The end of the upper chord material and the individual plywood are connected by a horizontal support shaft so that they can swing vertically.
In the present invention, the lateral swing range of the upper chord member connected to the head of the column can be expanded while simplifying the structure of the rotary connecting mechanism as compared with the conventional case.
Therefore, even if the guard fence is constructed by bending it into a flat "dogleg" shape, the upper chord is placed at the center of the guard loop while maintaining the parallel positional relationship between the axis of the upper chord and the straight part of the guard loop. Since it can be arranged, unnecessary twisting force is not generated between the spacing material and the protective loop when the spacing material is made of strip, and when the spacing material is made of chain, the uppermost protection from the upper chord material. Keeping the distance between the peak and valley sides of the loop constant, the protective loop spacing function due to slack in the chain is not impaired.
Therefore, each material of the guard fence can be assembled smoothly as in the case of constructing the guard fence linearly, and there is no concern that the impact absorption action of the guard loop will be adversely affected.
In another embodiment of the present invention, the axis of the upper chord member adjacent to the strut is moved to the center of the individual plywood so that the axis of the upper chord member and the straight portion of the protective loop maintain a parallel positional relationship. The upper chord member is arranged so as to be oriented so that the upper chord member can swing sideways around the central axis of the support column.
In another embodiment of the present invention, an end cylinder is attached to the end of the upper chord member, and a connecting piece projecting from the end of the end cylinder and a connecting piece provided on a plurality of plywoods are laterally supported. It is rotatably connected by a shaft.
In another embodiment of the present invention, a plurality of convex portions and a plurality of concave portions that can be fitted with the convex portions are formed on the facing surfaces of the plurality of overlapping plates.
In another embodiment of the present invention, the plurality of plywood plates are rotatably pivotally supported by pivot bolts screwed onto the top surfaces of the columns.
In another embodiment of the present invention, a friction-sliding shock absorber that grips a rope material having a total length that allows the protective loop to be wound in a loop between adjacent columns and a superposed portion near both ends of the rope material. It has and.

The present invention has at least one of the following effects.
<1> Since the only component of the rotary connection mechanism is the plywood, the lateral swing range of the upper chord material with respect to the head of the column can be reduced while reducing the number of components of the rotary connection mechanism and simplifying the structure. Can be expanded significantly.
<2> can be assembled rotatable connecting mechanism simple as screwing a plurality of polymerized plate was placed to overlap the top surface of the strut in a plurality of pivot bolts.
<3> Regardless of the bending angle of the adjacent upper chord members, the upper chord members can be placed at the center position of the protective loop while maintaining the parallel positional relationship between the axis of each upper chord member and the straight part of the protective loop. , The distance from the upper chord material to the ridge side and the valley side of the uppermost protective loop becomes uniform, and there is a twist between the spacing material and the protective loop, and there is a difference in the mounting length of the spacing material between the ridge side and the valley side. No.
Therefore, even if the guard fence is bent in a flat "dogleg" shape and connected, the work of fixing the intersection of the spacing member and the guard loop is easy, and the shock absorbing action of the guard loop is not adversely affected.
<4> When the convex portion and the concave portion are formed on the facing surfaces of the plurality of plywoods, the free rotation of the plurality of plywoods can be restrained, so that each interval holding material can be stably connected to the plurality of plywoods.

Perspective view of a guard fence according to the present invention provided with a rotary connecting mechanism. Longitudinal cross-sectional view of the rotary connecting mechanism provided on the strut head Exploded-view of rotary connection mechanism Perspective view of impact attenuator Top view of the rotary connection mechanism with a part of the plywood omitted An explanatory diagram of a method of assembling a guard fence, (A) is an explanatory diagram of a process of bending a plurality of upper chord members between the heads of adjacent columns and laying them horizontally, and (B) is a protective loop between adjacent columns. Explanatory drawing of the process of laying horizontally and the process of attaching the spacing material Explanatory drawing according to another embodiment of the rotary connecting mechanism, the perspective view of the peripheral portion of the plywood. In the explanatory view of the guard fence premised on the present invention, (A) is a side view of the guard fence with a part omitted, and (B) is a vertical sectional view of a conventional rotary connecting mechanism in which a part is broken.

The present invention will be described in detail below with reference to the drawings.

<1> Guard fence Explaining with reference to FIGS. 1 to 3, the guard fence premised on the present invention is between a plurality of columns 10 erected at predetermined intervals and the heads of adjacent columns 10. A horizontal upper chord member 20, a plurality of protective loops 30 having a buffering function laid horizontally between adjacent columns 10, a wire mesh 33 attached to the mountain side of the plurality of protective loops 30, and hanging on the upper chord member 20. It is provided with the interval holding material 40 for the loop provided in the above.
A rotation connecting mechanism 50, which will be described later, is interposed between the head of each strut 10 and the end of the upper chord member 20, and each upper chord member 20 swings (turns) in the vertical and horizontal directions with respect to the strut 10. Movement) It is connected as possible. The present invention is an improvement of the rotary connection mechanism 50.
The main components of the guard fence will be described below.

<2> Columns Explaining with reference to FIG. 3, the columns 10 are, for example, steel pipes, concrete-filled steel pipes, concrete columns, and the like.
A plurality of positioning elements 11 such as hooks or grooves for positioning the protective loop 30 in the height direction are provided on the peripheral surface of the support column 10 in multiple stages. Further, a bolt hole 12 for attaching the rotary connecting mechanism 50 is provided on the top surface of the support column 10.

<3> Protective loop The protective loop 30 is a friction slide that grips a rope material 31 such as a wire rope having a total length that can be wound in a loop between adjacent columns 10 and an overlapping portion near both ends of the rope material 31. It is provided with a movable shock absorber 32.

Explaining the shock absorber 32 illustrated in FIG. 4, the shock absorber 32 is inserted into the restraint plate 32a and the restraint plate 32a capable of accommodating the overlapping portions near both ends of the rope material 31 by folding back the center of the plate body. The partition plate 32b and the tightening means 32c for tightening the restraint plate 32a in the contraction direction are provided, and the rope member 31 inserted into the restraint plate 32a is tightened by the tightening means 32c. It has a structure that can be gripped movably.
When an impact load of a certain level or more acts as tension on a part of the protective loop 30, the shock absorber 32 slides between the shock absorber 32 and the rope material 31, and the impact load is attenuated by this sliding resistance. ..

<4> Upper chord material Explaining with reference to FIGS. The bottomed end cylinder 21 is exteriorized.
Since the upper chord member 20 is not a member that functions when receiving an impact, but functions as a spacing member for the columns 10 when the protective loop 30 is attached, it is not necessary to impart special high rigidity.

<2.1> End cylinder The end cylinder 21 is a cylinder for adjusting the length of the upper chord member 20, and is used by exteriorizing the end portion of the upper chord member 20.
A slit 22 is provided along the axial direction on the peripheral surface of the end cylinder 21 on the open side, and the peripheral surface of the end cylinder 21 can be fixed so as not to slide by tightening with a tightening bolt 23.

<2.2> Connecting piece A connecting piece 24 having a pin hole in the horizontal direction is integrally projected on the tip surface of the end cylinder 21. In another form, the end cylinder 21 may be omitted and the connecting piece 24 may be provided directly on the end face of the upper chord member 20.

<3> Rotational connection mechanism The rotation connection mechanism 50 will be described with reference to FIGS. 2, 3 and 5.
The rotary connecting mechanism 50 is composed of a plurality of plywood 51s that are placed on top of the support column 10 and pivotally supported.

<3.1> Plywood The plywood 51 is a disk that can be placed on the top surface of the support column 10, and is used in the same number as the upper chord member 20 to be connected. The reason why the plywood 51s are used in layers is that they are individually rotated without being affected by the other plywoods 51.

<3.2> Plywood structure of plywood The plurality of plywood 51s are individually rotatably and rotatably supported on the top surface of the plywood around the central axis of the plywood 10.
In order to rotatably support the plurality of plywood 51, for example, a plurality of arcuate guide holes 52 provided at symmetrical positions of the plywood 51 and a pivot bolt 54 to be inserted into the guide hole 52 are combined and pivoted. I can support you. In the case of this embodiment, the maximum swing (rotation) angle of the upper chord member 20 in the lateral direction with respect to the support column 10 can be changed by selecting the total length of the guide hole 52.

The pivotal structure of the plywood 51 is not limited to this example.

<3.3> Strut head and pivotal structure of upper chord member A connecting piece 53 having a lateral pin hole projects from the peripheral edge of each plywood 51 toward the center of the plywood 51.
The connecting piece 53 of each plywood 51 is formed at a position where it does not interfere with other plywood 51 when the plywood 51 is stacked.

As shown in FIG. 3, the end cylinder 21 and the connecting pieces 24 and 53 of the plywood 51 are polymerized, and the horizontal support shaft 55 is inserted into the polymerized pin holes of both the connecting pieces 24 and 53 to form the end cylinder 21. It is possible to vertically swing between the upper chord member 20 and the head of the support column 10 so as to be swingable.
The upper chord member 20 connected to each plywood 51 in this way can not only swing laterally around the central axis of the support column 10, but also swing vertically around the horizontal support shaft 55. ..
In particular, by connecting the ends of each upper chord member 20 to the individual plywood 51, the swing angle of the upper chord member 20 can be increased in the lateral direction.

<3.4> Positional relationship between the upper chord member and the straight portion of the protective loop The reason why the connecting piece 53 is formed toward the center of the plywood 51 is that the axis of the upper chord member 20 connected to the plywood 51 is always the plywood. This is to face the center of 21.
In other words, even when the connection angle (bending angle) of the pair of left and right upper chord members 20 adjacent to the support column 10 is changed, the parallel positional relationship between the axial center of the upper chord members 20 and the straight portion of the protective loop 30 is maintained. This is because the upper chord member 20 is arranged at the center position of the protective loop 30 when viewed in a plan view while maintaining the position.

<4> Spacing holding material Explaining with reference to FIG. 1, the spacing holding material 40 is a member that keeps the vertical spacing of the protective loop 30 constant, and has a length that can be attached across a plurality of protective loops 30.
The spacing member 40 of this example is formed by folding the strips into a U shape, and the folded portion is attached to the upper chord member 20 to hang down, while the intersections of the two strips 41 extending downward and each protective loop 30 are formed. The form of fixing with a fixing tool 42 such as a U-bolt will be described, but a form in which a chain is applied to the portion of the strip 41 may also be used.
When a chain is applied to the spacing member 40, the intersection of the chain extending downward and each protective loop 30 is fixed with a fixture such as a U bolt.

[How to assemble a guard fence]
Next, a method of assembling the guard fence will be described.

<1> Temporary assembly of the rotary connecting mechanism and erection of struts A plurality of struts 10 are erected at a predetermined interval. At this time, it is preferable to screw the pivot bolt 54 and temporarily assemble a plurality of plywood 51 on the top surface of each support column 10 in advance.

<2> Installation of the upper chord material The upper chord material 20 is laid horizontally between the heads of the adjacent columns 10 by performing the following operations.
As shown in FIG. 3, the sideways upper chord member 20 is lifted to the height of the head of the support column 10.
Next, as shown in FIG. 5, each polymerized plate 51 temporarily assembled on the top surface of the column 10 is individually rotated to align the connecting pieces 53 in the connecting direction, and the laminated pieces 24 and 52 are laterally supported. The shaft 55 is inserted and connected.
After finishing the rotation of each plywood 51, the pivot bolt 54 is tightened to fix the plurality of plywood 51 so as not to rotate.

In the present invention, since the swinging range of the upper chord member 20 by the rotary connecting mechanism 50 is large, the left and right upper chord members 20 adjacent to the support column 20 as shown in FIG. It can be bent greatly and connected. Regardless of the bending angle of the adjacent left and right upper chord members 20, the axis of each upper chord member 20 always faces the central axis of the support column 10.
Further, as shown in FIG. 5, since the upper chord member 20 is connected to the support column 10 so as to be able to swing in the vertical direction, it is possible to follow the height difference between the heads of the adjacent support columns 10.

<3> Horizontal protection loops Next, a plurality of protection loops 30 are horizontally laid between the peripheral surfaces of adjacent columns 10.
When forming the protective loop 30, if both ends of the rope material 31 are tightened, the adjacent columns 10 are attracted to each other, but the upper chord member 20 prevents the columns 10 from tilting and keeps the distance between the adjacent columns 10 constant. Is done.
Since the tightening force of the rope material acts toward the central axis of the adjacent columns 10 via the upper chord member 20, the columns 10 do not rotate due to the tightening force of the rope material.

<4> Installation of spacing member The spacing member 40 is hung on the upper chord member 20 after the protection loop 30 is erected or during the erection work.
Fixtures 42 are attached and fixed at the intersections of the two strips 41 extending downward from the spacing member 40 and the protective loops 30.

As shown in FIG. 6B, even if the adjacent upper chord members 20 are bent and connected, the upper chord members maintain the parallel positional relationship between the axis of each upper chord member 20 and the straight portion of the protective loop 30. Since the 20 can be arranged at the center position of the protective loop 30, the distance from the upper chord member 20 to the peak side and the valley side of the uppermost protective loop 30 becomes constant, and when the spacing member 40 is assembled, the spacing member 40 and the spacing member 40 are used. No twist occurs between the protective loops 30.
Therefore, it is easy to fix the intersection of the spacing member 40 and the protective loop 30 as in the case where the adjacent left and right upper chord members 20 are arranged in a straight line.

Even when the spacing member 40 is made of a chain, the distance from the upper chord member 20 to the peak side and the valley side of the uppermost protective loop 30 does not change, so that the chain can be prevented from loosening.

<5> Attaching the wire mesh Finally, as shown in FIG. 1, the wire mesh 33 is attached to the receiving surface of the plurality of protective loops 30.

<6> Impact absorption action of the protective fence When a rock fall or the like collides with the receiving surface of the protective fence, the protective loop 30 and the wire mesh 33 are deformed to the valley side, and when the impact load exceeds a certain value, the rope constituting the protective loop 30. By sliding between the material 31 and the shock absorber 32, the impact load is absorbed by the frictional resistance during sliding.
The protective fence provided with the protective loop 30 has a characteristic that the loop length becomes longer as the impact load is absorbed, but the amount of deformation toward the valley side is smaller than that of the single type of rope material.

As shown in FIG. 6B, even if the adjacent left and right upper chord members 20 are bent in a plane, a twisting force does not act between the protective loop 30 and the spacing member 40, so that the protective loop 30 is originally Can exert the shock absorbing effect of.

[Other Examples]
Other examples will be described below, but in the description thereof, the same parts as those in the above-described embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

<1> Other Rotational Connection Mechanism The other rotation connection mechanism 5 will be described with reference to FIG. 7.
In this example, a form in which a plurality of convex portions 51a and a plurality of concave portions 51b that can be fitted with the convex portions 51a are formed on the facing surfaces of the plurality of overlapping plates 51 constituting the rotary connecting mechanism 50 will be described.
The protrusion shape of the convex portion 51a is not particularly limited, and the concave portion 51b may be either a through hole or a bottomed groove.
The forming position of the convex portion 51a and the concave portion 51b is not limited to the peripheral edge portion of the plywood 51, and can be formed at any position.

<2> Operation and effect of this embodiment In this embodiment, since the free rotation of the overlapped plywood 51 can be restrained by fitting the convex portion 51a and the concave portion 51b, the pivot bolt 54 The effect of restraining the rotation of the plurality of plywood 51s after attachment is remarkably increased.

10 ... Support 20 ... Upper chord material 21 ... End cylinder 24 ... End cylinder connecting piece 30 ... Protective loop 31 ... Rope material 32 ... Buffer Tool 33 ... Wire mesh 40 ... Spacing holding material 50 ... Rotational connection mechanism 51 ... Plywood plate 51a ... Plywood convex portion 51b ... Plywood concave portion 52 ...・ ・ ・ Guide hole 53 ・ ・ ・ ・ Plywood connecting piece 54 ・ ・ ・ ・ Plywood bolt 55 ・ ・ ・ ・ Horizontal support shaft

Claims (5)

A rope material is wrapped in a loop between the peripheral surfaces of adjacent columns, and a plurality of protective loops are laid horizontally in multiple stages, and a rotation connecting mechanism is interposed between the heads of the adjacent columns. It is an erection structure of the upper chord material in a protective fence provided with a plurality of upper chord members that keep the strut spacing constant and a spacing member that is hung on the upper chord material and keeps the vertical spacing of the protective loop constant.
A plurality of plywood plates in which the rotary connecting mechanism is placed so as to be overlapped on the top surface of the column and individually rotatably supported around the central axis of the column.
It is provided with a plurality of pivot bolts that are screwed to the top surface of the support column to fix the plurality of plywood plates.
The plurality of plywoods have a plurality of guide holes having an arc shape at symmetrical positions.
A plurality of plywoods individually rotated according to the connection position with the end of the upper chord member adjacent to the support column are made non-rotatable by the plurality of pivot bolts inserted into the plurality of guide holes. Fixed,
The end of the upper chord material adjacent to the strut and the individual plywood are connected by a horizontal support shaft so as to be swingable in the vertical direction.
The erection structure of the upper chord material in the guard fence. The axes of the upper chords adjacent to the columns are arranged toward the center of the individual plywood so that the axis of the upper chords and the straight part of the protective loop maintain a parallel positional relationship. The erection structure of the upper chord member in the guard fence according to claim 1, wherein the upper chord member can swing laterally about the central axis of the column. An end cylinder is attached to the end of the upper chord material, and a connecting piece projecting from the end of the end cylinder and a connecting piece provided on a plurality of plywoods are rotatably connected by a horizontal support shaft. The erection structure of the upper chord member in the guard fence according to claim 1 or 2, wherein the guard rail is provided. The invention according to any one of claims 1 to 3, wherein a plurality of convex portions and a plurality of concave portions that can be fitted with the convex portions are formed on the facing surfaces of the plurality of laminated plates. The erection structure of the upper chord material in the guard fence. The protective loop is provided with a rope material having a total length that can be wound in a loop between adjacent columns, and a friction-sliding shock absorber that grips the overlapping portions near both ends of the rope material. The erection structure of the upper chord material in the guard fence according to claim 1 or 2, which is characteristic.

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