JP2020079511A - Construction structure of upper chord in guard fence - Google Patents

Abstract

To provide a construction structure of an upper chord which makes it easy to do the fixing work of the intersection of a spacing member and a protection loop even if adjacent upper chords are bent and connected with respect to a pole, so that the impact absorption effect of the protection loop is not adversely affected.SOLUTION: In a guard fence equipped with a plurality of protection loops 30, a rotation coupling mechanism 50, a plurality of upper chords 20 and a spacing member 40, the rotation coupling mechanism 50 is composed of a plurality of overlapping plates 51 pivotally supported on the top surface a pole 10, and the upper chord 20 coupled to each overlapping plate 51 is capable of swinging laterally and coupled to be swingable vertically about a lateral support shaft 55.SELECTED DRAWING: Figure 2

Description

  TECHNICAL FIELD The present invention relates to a protective fence capable of responding to fallen rocks, collapsed earth and sand, and avalanches, and more particularly to a structure for constructing an upper chord member in a protective fence having an improved rotary connection mechanism.

Patent Document 1 discloses a protective fence generally called a "loop fence", which is provided with a protective loop in which a rope material is wound in a loop between the peripheral surfaces of adjacent columns and which is laid horizontally in multiple stages.
Explaining this protective fence with reference to FIG. 8(A), when the protective loop 30 is laid horizontally between the peripheral surfaces of the adjacent columns 10, the rope material wound in a loop is tightened. When tightening, adjacent columns 10 may be attracted to each other and tilt.
Therefore, before the horizontal operation of the protective loop 30, the upper chord member 20 is bridged between the heads of the adjacent columns 10 to keep the intervals between the columns 10 constant.
Further, the spacing member 40 is hung on the upper chord member 20, and the vertical point of the protection loop 30 is fixed by fixing the intersection of the strip of the spacing member 40 that extends vertically and the protection loop 30 that is horizontally extended in multiple stages. Holds constant.
It is also known that the space retaining member 40 is a chain applied to a part of a vertically extending strip plate, and it is an intersection of each vertically extending chain hanging from the upper chord member 20 and the protection loop 30 which is laid horizontally in multiple stages. Is fixed.

The guard fence provided with the upper chord member 20 incorporates a knuckle-type rotation connecting mechanism 60 between the head of the column 10 and the end of the upper chord member 20 so that the fence can be assembled in response to ups and downs of a slope. The upper chord member 20 is connected so that it can swing.
The conventional rotary connection mechanism 60 will be described with reference to FIG. 8B. The head cap 13 is provided on the head of the column 10. At the end of the upper chord member 20, an end cylinder 62 accommodating a hemispherical body 61 is exteriorly mounted.
It has a structure in which two hemispheres 61 arranged facing each other with the head cap 13 sandwiched therebetween are connected by one spindle bolt 63 that horizontally penetrates.

  Further, Patent Document 2 discloses a protective fence in which a pivotal connecting mechanism is provided on a side portion of a column and an upper chord member can be swung in the front-rear direction and the vertical direction.

JP, 2003-184035, A JP, 2003-34912, A

The conventional protective fence provided with the rotary connection mechanism has the following problems.
<1> The pivotal connection mechanism 60 described in Patent Document 1 has a large number of constituent parts, requires a lot of assembly work, and has room for improvement.
<2> Furthermore, since the swinging angle of the upper chord member 20 with respect to the support column 10 is small, it is difficult to construct the rotation connecting mechanism 60 described in Patent Document 1 by bending the protection fence into a plane “<” shape. Is.
<3> When the protection fence described in Patent Document 1 is bent in a plane V-shape and is installed, not only an unnecessary rotational force is generated in the pillar 10, but also the straight portion of the protection loop 30 and the upper chord member 20 are formed. Because of the twisted 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 shock absorbing action of the protective loop 30.
<4> Even if the chain is applied to the spacing member 40, the upper chord member 20 and the protective loop 30 will have a twisted positional relationship when the protection fence is bent in a plane "V" shape and installed. The distance from the upper chord member 20 to the mountain side and the valley side of the uppermost protection 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. Since the shorter chain becomes slack, the vertical spacing of the protective loop 30 cannot be kept constant.
<5> In the pivotal connection mechanism described in Patent Document 2, since the formation interval of the vertical support shafts arranged side by side outside the support column is unchanged, when applied to the protective fence described in Patent Document 1, 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 a structure for constructing an upper chord member in at least one of the following protection fences.
<1> The swing connecting mechanism can be simplified and the swing range of the upper chord member with respect to the head of the column can be expanded.
<2> Assembly work of the rotation coupling mechanism is easy.
<3> Even if the adjacent upper chord members are bent and connected to the columns, it is easy to fix the intersection of the spacing member and the protective loop, and the shock absorbing action of the protective loop is not adversely affected.

The present invention provides a plurality of protective loops, which are laid horizontally in a loop shape by winding a rope material between the peripheral surfaces of adjacent columns, and between the heads of the adjacent columns with a rotation coupling mechanism interposed. An upper chord member erection structure in a protective fence that is provided with a plurality of upper chord members that are laterally bridged and that maintains a constant column spacing, and a spacing member that hangs on the upper chord member to maintain a constant vertical spacing of the protective loop. The rotation coupling mechanism is placed on the top surface of the support column in a stacked manner and is composed of a plurality of overlapping plates pivotally supported individually about the central axis of the support column, and is adjacent to the support column. An end portion of the upper chord member and an individual overlapping plate are vertically swingably connected by a horizontal support shaft.
According to 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 rotation connecting mechanism as compared with the related art.
Therefore, even if the guard fence is constructed by bending it into a plane V shape, the upper chord material is placed in the central position of the protection loop while maintaining the parallel positional relationship between the axis of the upper chord material and the straight portion of the protection loop. Since it can be arranged, unnecessary twisting force does not occur between the spacing member and the protective loop when the spacing member is made of strip plate, and when the spacing member is made of chain, the uppermost chord member is protected from the upper chord material. The distance between the mountain side and the valley side of the loop is kept constant, and the slack of the chain does not impair the function of maintaining the spacing of the protective loop.
Therefore, each material of the protective fence can be assembled smoothly as in the case of constructing the protective fence in a straight line, and there is no fear of adversely affecting the shock absorbing action of the protective loop.
In another embodiment of the present invention, the axis of the upper chord member adjacent to the support is set to the center of each individual overlapping plate so that the axial center of the upper chord member and the linear portion of the protective loop maintain a parallel positional relationship. The upper chord member can be laterally swung about the center axis of the column.
In another aspect of the present invention, an end tube is externally mounted on an end of the upper chord member, and a horizontal support is provided between a connecting piece provided on the end of the end tube and a connecting piece provided on the plurality of overlapping plates. It is rotatably connected by a shaft.
In another aspect of the present invention, a plurality of convex portions and a plurality of concave portions that can be fitted into the convex portions are formed on the facing surfaces of the plurality of overlapping plates.
In another aspect of the present invention, the plurality of overlapping plates are pivotally supported by pivot bolts screwed to the top surfaces of the columns.
In another form of the present invention, a friction slide type shock absorber for gripping a rope material having a full length that allows the protective loop to be wound in a loop shape between adjacent columns and a overlapping portion near both ends of the rope material. It is equipped with.

The present invention has at least one of the following effects.
<1> Since the component of the pivotal coupling mechanism is only the overlapping plate, the lateral swing range of the upper chord member with respect to the head of the column can be reduced while reducing the number of components of the pivotal coupling mechanism and simplifying the structure. Can be greatly expanded.
<2> The rotation coupling mechanism can be assembled by a simple operation of pivotally supporting a plurality of overlapping plates placed on the top surface of the column with pivot bolts or the like.
<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 line portion of the protective loop. , The distance from the upper chord to the crest side and the trough side of the uppermost protection loop becomes uniform, and twisting occurs between the spacing material and the protection loop, and there is a difference in the mounting length of the spacing material between the crest side and the trough side. Absent.
Therefore, even if the protective fence is bent and connected in a plane V shape, it is easy to fix the intersection of the spacing member and the protective loop, and the shock absorbing action of the protective loop is not adversely affected.
<4> When the convex portions and the concave portions are formed on the facing surfaces of the plurality of overlapping plates, the free rotation of the plurality of overlapping plates can be restrained, so that the spacing members can be stably connected to the plurality of overlapping plates.

Perspective view of a protective fence according to the present invention equipped with a pivotal connection mechanism Vertical cross-sectional view of the pivotal connection mechanism provided on the head of the column Exploded assembly view of the rotation coupling mechanism Shock absorber perspective view The top view of the rotation connection mechanism which abbreviate|omitted a part of overlapping plate. FIG. 3 is an explanatory view of an assembling method of a protective fence, (A) is an explanatory view of a process of bending a plurality of upper chord members between the heads of adjacent struts and horizontally laying them, and (B) is a protective loop between adjacent struts. Explanatory drawing of the process of horizontally mounting and attaching the spacing material It is explanatory drawing which concerns on the other Example of a rotation connection mechanism, and is a perspective view of the peripheral part of an overlapping plate. FIG. 1 is an explanatory view of a protective fence premised on the present invention, (A) is a side view of the protective fence with a part omitted, and (B) is a vertical cross-sectional view of a conventional rotary coupling mechanism with a part cut away.

  Hereinafter, the present invention will be described in detail with reference to the drawings.

<1> Protective Fence Described with reference to FIGS. 1 to 3, a protective fence, which is a premise of the present invention, is provided between a plurality of columns 10 standing upright with a predetermined interval and between heads of adjacent columns 10. An upper chord member 20 which is horizontally laid, a plurality of protective loops 30 which are horizontally laid between adjacent columns 10 and which has a cushioning function, a wire net 33 attached to the mountain side of the plurality of protection loops 30, and a hanging member on the upper chord member 20. And the spacing member 40 for the loop provided as described above.
A pivotal connecting mechanism 50, which will be described later, is interposed between the head of each of the columns 10 and the end of the upper chord member 20, and each of the upper chord members 20 swings in the vertical and horizontal directions with respect to the column 10. Connected). The present invention is an improvement of the rotary connection mechanism 50.
The main components of the protective fence will be described below.

<2> Support Columns Referring to FIG. 3, the support columns 10 are, for example, steel pipes, concrete-filled steel pipes, concrete columns, or 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 column 10 in multiple stages. Further, a bolt hole 12 for mounting the rotation coupling mechanism 50 is provided on the top surface of the 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 full length that can be wound in a loop shape between adjacent columns 10 and an overlapping portion near both ends of the rope material 31. And a dynamic shock absorber 32.

The cushioning tool 32 illustrated in FIG. 4 will be described. The cushioning tool 32 has a constraining plate 32a capable of accommodating overlapping portions near both ends of the rope member 31 by folding back the center of the plate body and interposing in the constraining plate 32a. The partition plate 32b and the tightening means 32c for tightening the restraint plate 32a in the contracting direction are provided, and the rope member 31 inserted into the restraint plate 32a is tightened by the tightening means 32c near both ends. It is structured so that it can be movably held.
The shock absorber 32 slides between the shock absorber 32 and the rope material 31 when an impact load above a certain level acts as tension on a part of the protective loop 30, and the impact load is attenuated by this sliding resistance. .

<4> Upper chord member Explaining with reference to FIGS. 2 and 3, the upper chord member 20 is a steel hollow tube having a full length capable of being horizontally stretched between the heads of the adjacent columns 10, and its end portion is An end cylinder 21 having a bottomed structure is externally mounted.
Since the upper chord member 20 is not a member that functions when receiving a strike, but functions as a spacing member for the columns 10 when the protective loop 30 is attached, it is not necessary to impart 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 being externally mounted on the end portion of the upper chord member 20.
A slit 22 is opened along the axial direction on the open side peripheral surface of the end cylinder 21, and the peripheral surface of the end cylinder 21 can be fixed in a non-sliding manner by tightening with a tightening bolt 23.

<2.2> Connection Piece A connection piece 24 having a lateral pin hole is integrally provided on the tip surface of the end cylinder 21 so as to project. In another form, the end cylinder 21 may be omitted and the connecting piece 24 may be provided directly on the end surface of the upper chord member 20.

<3> Rotary Connection Mechanism The rotary connection mechanism 50 will be described with reference to FIGS.
The rotation coupling mechanism 50 is composed of a plurality of overlapping plates 51 placed on the top surface of the support column 10 so as to be stacked and pivotally supported.

<3.1> Overlapping Plate The overlapping plate 51 is a disc that can be placed on the top surface of the column 10, and is used in the same number as the upper chord members 20 to be connected. The overlapping plates 51 are used in order to rotate individually without being influenced by other overlapping plates 51.

<3.2> Pivot Support Structure of Overlapping Plates A plurality of overlapping plates 51 are individually pivoted on the top surface of the column 10 so as to be rotatable about the central axis of the column 10.
To rotatably support the plurality of overlapping plates 51, for example, a plurality of arcuate guide holes 52 provided at symmetrical positions of the overlapping plates 51 and a pivot support bolt 54 to be inserted into the guide holes 52 are combined. Can support In the case of the present 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 entire length of the guide hole 52.

  The pivot structure of the overlapping plate 51 is not limited to this example, and although not shown in the drawings, a single pivot bolt 54 is inserted through the central portion of the plural overlapping plates 51 to center the pivot bolt 54. Alternatively, each stacking plate 51 may be rotatably supported. With the pivotal support structure of this example, not only the process of forming the guide hole 52 is unnecessary, but also the number of pivotal bolts 54 can be reduced.

<3.3> Pivot Head and Upper Chord Material Pivot Supporting Structure A connecting piece 53 having a lateral pin hole is provided on the periphery of each overlapping plate 51 so as to project toward the center of the overlapping plate 51.
The connecting piece 53 of each overlapping plate 51 is formed at a position where it does not interfere with other overlapping plates 51 when the overlapping plates 51 are stacked.

As shown in FIG. 3, the end cylinder 21 and the connecting piece 24, 53 of the overlapping plate 51 are polymerized, and the lateral support shaft 55 is inserted into the pin hole where both the connecting pieces 24, 53 are superposed. The upper chord member 20 and the head of the column 10 can be connected vertically so as to be swingable.
As described above, the upper chord member 20 connected to each overlapping plate 51 can not only horizontally swing about the central axis of the column 10, but also vertically swing around the horizontal support shaft 55. .
Particularly, by connecting the ends of the upper chord members 20 to the individual overlapping plates 51, the swinging angle of the upper chord members 20 can be increased in the lateral direction.

<3.4> Positional Relationship between Upper Chord Member and Straight Part of Protective Loop The connecting piece 53 is formed toward the center of the overlapping plate 51 because the axis of the upper chord member 20 connected to the overlapping plate 51 is always an overlapping plate. This is so as to face the center of 21.
In other words, even when the connecting angle (bending angle) of the pair of left and right upper chord members 20 adjacent to the column 10 is changed, the parallel positional relationship between the axial center of the upper chord member 20 and the straight portion of the protective loop 30 is changed. This is because the upper chord member 20 is arranged at the central position of the protective loop 30 when viewed in a plan view while being maintained.

<4> Interval Holding Material Explaining with reference to FIG. 1, the distance holding material 40 is a member that holds the vertical intervals of the protective loops 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 a strip into a U-shape, and the folded portion is attached to the upper chord member 20 and hangs down, while the intersection of the two strips 41 extending downward and each protective loop 30 is formed. Although a form of fixing with a fixing tool 42 such as a U-bolt will be described, a form in which a chain is applied to the band plate 41 may be used.
When a chain is applied to the spacing member 40, the intersection point between the chain extending downward and each protective loop 30 is fixed with a fixture such as a U bolt.

[Assembling the protective fence]
Next, a method of assembling the protective fence will be described.

<1> Temporary Assembly of Rotating Connection Mechanism and Standing of Posts A plurality of posts 10 are set up at a predetermined interval. At this time, it is preferable that the pivot bolts 54 be screwed and the plurality of overlapping plates 51 be preliminarily assembled to the top surfaces of the columns 10.

<2> Installation of upper chord member The following work is performed to horizontally hang the upper chord member 20 between the heads of the adjacent columns 10.
As shown in FIG. 3, the upper horizontal chord member 20 is hung up to the head height of the column 10.
Next, as shown in FIG. 5, each overlapping plate 51 temporarily assembled on the top surface of the column 10 is individually rotated to align the connecting piece 53 with the connecting direction, and is laterally supported on the overlapping connecting pieces 24 and 52. The shaft 55 is inserted and connected.
When the rotation of each stacking plate 51 is completed, the pivot bolts 54 are tightened to fix the stacking plates 51 in a non-rotatable manner.

In the present invention, since the swinging range of the upper chord member 20 by the pivotal connection mechanism 50 is large, the upper and lower chord members 20 adjacent to the column 20 as shown in FIG. Can be bent and connected greatly. The axis of each upper chord member 20 always faces the central axis of the column 10 regardless of the bending angle of the adjacent upper and lower chord members 20.
Further, as shown in FIG. 5, since the upper chord member 20 is connected to the support column 10 so as to swing vertically, it is possible to follow the height difference between the heads of the adjacent support columns 10.

<3> Horizontal laying of protective loops Next, a plurality of protective loops 30 are horizontally laid in multiple stages between the peripheral surfaces of the adjacent columns 10.
When forming both ends of the rope member 31 when forming the protective loop 30, the adjacent columns 10 are attracted to each other, but the upper chord members 20 prevent the columns 10 from tilting and the intervals between the adjacent columns 10 are kept constant. Be 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 column 10 does not rotate due to the tightening force of the rope material.

<4> Attachment of Interval Holding Material After the erection of the protective loop 30 or during the erection work, the distance maintaining material 40 is hung on the upper chord member 20.
A fixture 42 is attached and fixed to the intersection of each of the protective loops 30 and the two strips 41 extending downward from the spacing member 40.

As shown in FIG. 6(B), even if adjacent upper chord members 20 are bent and connected, the upper chord members 20 are maintained while maintaining the parallel positional relationship between the axis of each upper chord member 20 and the straight portion of the protective loop 30. Since 20 can be arranged at the central 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, No twisting occurs between the guard loops 30.
Therefore, similarly to the form in which the adjacent left and right upper chord members 20 are linearly arranged, it is easy to fix the intersection of the spacing member 40 and the protective loop 30.

  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 protection loop 30 does not change, so that the slack of the chain can be prevented.

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

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

  As shown in FIG. 6(B), even if the adjacent left and right upper chord members 20 are bent in a plane, a twisting force does not work between the protective loop 30 and the spacing member 40. The shock absorbing effect of can be exhibited.

[Other embodiments]
Other embodiments will be described below. In the description, the same parts as those in the above-mentioned embodiments are designated by the same reference numerals, and detailed description thereof will be omitted.

<1> Other Rotational Coupling Mechanism Another rotational coupling mechanism 5 will be described with reference to FIG. 7.
In this example, a configuration will be described in which a plurality of convex portions 51a and a plurality of concave portions 51b that can be fitted into the convex portions 51a are formed on the facing surfaces of the plurality of overlapping plates 51 that form the rotary coupling mechanism 50.
There is no particular limitation on the shape of the protrusion of the convex portion 51a, and the concave portion 51b may be either a through hole or a bottomed groove.
The formation positions of the convex portion 51a and the concave portion 51b are not limited to the peripheral portion of the overlapping plate 51, and they can be formed at arbitrary positions.

<2> Operation and effect of the present embodiment In this embodiment, the convex portion 51a and the concave portion 51b are fitted to each other, whereby the free rotation of the overlapped superposed plates 51 can be restricted. The effect of restraining the rotation of the plurality of overlapping plates 51 after attachment is significantly enhanced.

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

Claims (6)

A plurality of protective loops that are wound in a loop shape between the peripheral surfaces of the adjacent columns and are horizontally bridged in multiple stages, and are horizontally bridged between the heads of the columns that are adjacent to each other with a rotation coupling mechanism interposed. A structure for constructing an upper chord member in a protective fence, which comprises a plurality of upper chord members that keep the strut spacing constant, and a spacing member that hangs on the upper chord member to keep the vertical spacing of the protective loop constant,
The rotation coupling mechanism is placed on the top surface of the support column, and is composed of a plurality of overlapping plates that are individually pivotally supported about the center axis of the support column,
The end of the upper chord member adjacent to the column and the individual overlapping plate is connected by a horizontal support shaft so as to be vertically swingable.
Construction of the upper chord material on the protective fence.   The axes of the upper chords adjacent to the support are arranged toward the centers of the individual overlapping plates so that the axial center of the upper chords and the linear portion of the protective loop maintain a parallel positional relationship. The erection structure of the upper chord member in a protection fence according to claim 1, wherein the upper chord member can swing laterally around a center axis of a column.   An end tube is externally mounted on the end of the upper chord member, and a connecting piece protruding from the end of the end tube and a connecting piece provided on a plurality of overlapping plates are rotatably connected by a horizontal support shaft. The erection structure of the upper chord member in the protective fence according to claim 1 or 2, characterized in that.   4. A plurality of convex portions and a plurality of concave portions that can be fitted into the convex portions are formed on the facing surfaces of the plurality of overlapping plates, and the plurality of convex portions are formed. Erection structure of upper chord material in the protection fence of.   The protective fence according to any one of claims 1 to 4, wherein the plurality of overlapping plates are rotatably supported by a pivot bolt that is screwed to the top surface of the column. Construction of upper chord material.   The protection loop is provided with a rope material having a total length capable of being wound in a loop shape between adjacent columns, and a friction sliding type shock absorbing tool for gripping the overlapping portion near both ends of the rope material. The erection structure of the upper chord member in the protective fence according to claim 1 or 2, which is characterized.

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