JP3191916U - Protective fence - Google Patents

Abstract

PROBLEM TO BE SOLVED: To fully exert a protective function of a guard fence by surely preventing buckling deformation of a twist restraint rod by an economical method. SOLUTION: In a guard fence in which a pair of twist restraint rods 40, 40 are stretched between upper portions of adjacent H steel columns 10, 10, a horizontal truss structure 60 is provided between the pair of twist restraint rods 40, 40. Was arranged so that the distance between the pair of twist restraint rods 40 and 40 could be kept constant. [Selection diagram] Fig. 4

Description

  The present invention relates to a technology for reinforcing a protective fence for falling rocks, avalanches, fallen soil, and the like, and more particularly, to a protective fence provided with an H steel support.

  As described in Patent Document 1, a plurality of rope members are laid in multiple stages between H steel columns that are erected at intervals, and a wire mesh is laid between the rope materials. Guard fences having a structure that finally receives the impact of falling rocks acting on a part of the rope material with the strength of the support column are well known.

FIG. 6 is a diagram modeling the displacement of the H steel struts a ₁ and a ₂ and the rope members b _{1 to} b ₅ arranged in multiple stages when an impact is applied to the protective fence described in Patent Document 1. is there. Both ends of the rope members b _{1 to} b ₅ are fixed to the terminal column a ₁ , respectively, and a section between the ends of the rope members b _{1 to} b ₅ is slidably attached to the intermediate column a ₂ .
In the protective fence described in Patent Document 1, when an impact c such as falling rocks acts, the displacement amount of each rope member b _{1 to} b ₅ increases from the lower stage to the upper stage of the pillars a ₁ and a ₂ , and each pillar a It has been confirmed in experiments and accident sites that ₁ and a ₂ are not only bent but also twisted (rotational moment).

The applicant has previously proposed a protective fence in which a pair of torsional restraint rods are stretched between the upper portions of each column and reinforced (Patent Document 2).
This protective fence counteracts the tension of the struts while preventing the twisting of each strut by counteracting the tensile and compressive forces acting on the pair of torsion restraints with the strength of each torsion restraint. It can be regulated in a specific direction.
It was confirmed by a demonstration test that the protective fence reinforced with a pair of torsional restraint rods has a higher reinforcing effect than the protective fence described in Patent Document 1.

In addition, in the protective fence in which a pair of torsional restraint rods are reinforced by extending a pair of torsional restraint rods between the upper portions of each column, the applicant arranges one or more spacers between the pair of torsional restraint rods. A protective fence configured to be able to maintain a constant distance between a pair of torsional restraint rods has been proposed (Patent Document 3).
This protective fence can prevent buckling deformation of the torsional restraint rod by disposing a spacer between the pair of torsional restraint rods, and has a higher reinforcing effect than the protective fence described in Patent Document 2. Play.

JP-A-7-197423 (paragraph 0002, FIGS. 6 and 7) Japanese Patent No. 45199948 Utility Model Registration No. 3181426

The guard fence using a pair of torsional restraint rods has the following problems.
<1> For example, when designing a long span between struts, or when retrofitting a pair of torsional restraint rods to an existing protective fence with a long span between struts, buckling deformation to the torsional restraint rods on the compression side May occur.
<2> If the torsional restraint rod is buckled and deformed, a loss in load transmission may occur, and the original reinforcing effect of the support may not be exhibited.
<3> Buckling deformation can be prevented by increasing the diameter of the pair of torsional restraint rods, but there arises a problem that the weight of the torsional constraint rods increases, the handling property and transportability deteriorate, and the cost increases.
<4> When a spacer is disposed across a pair of torsional restraint rods, if the impact applied to the protective fence is large, adjacent spacers may tilt in the same direction and the deflection of the torsional constraint rods cannot be eliminated. there were.

The present invention has been made in view of the above points, and its object is to provide at least one protective fence as follows.
<1> The buckling deformation of the torsional restraint rod can be reliably prevented by an economical method.
<2> The reinforcement effect of the column can be improved.
<3> The ability to receive the protective fence can be fully demonstrated.

  The protective fence of the present application is a protective fence in which a pair of torsional restraint rods is stretched between the upper portions of adjacent H steel columns, and is rigidly connected between the pair of torsional restraint rods and the pair of torsional restraint rods. A horizontal truss structure is constituted by a plurality of truss members.

  The protective fence of the present application is characterized in that the means for rigidly connecting the truss material to the torsional restraint rod is bolt fastening.

  The protective fence of the present application is characterized in that the means for rigidly connecting the truss material to the torsional restraint rod is welding.

  The guard fence of the present application is characterized in that the truss material is a bar material or a pipe material.

The present invention can obtain at least one of the following effects.
<1> The buckling deformation of the torsional restraint can be reliably prevented only by arranging the horizontal truss structure between the pair of torsional restraint.
<2> By arranging a horizontal truss structure between a pair of torsional restraint rods, it is possible to remarkably enhance the reinforcement effect of the column by a pair of torsional restraint rods stretched between the upper portions of adjacent struts. Become.
Therefore, the receiving performance as a protective fence can be fully exhibited.
<3> Since the horizontal truss structure is a simple structure in which the truss members are simply connected by rigid means, it can be manufactured at low cost, and it can be easily installed on the torsional restraint without requiring a long time. be able to.
<4> Since the truss material is detachable with respect to the rigid means, the horizontal truss structure can be easily formed on the torsional restraint rod.
<5> When the torsional restraint rod is stretched via the mounting jig, it is not necessary to perform any processing on the support column, and the stretching operation of the torsional restraint rod can be performed easily and in a short time.

It is explanatory drawing of the protection fence which concerns on this invention, (a) is the figure seen from the slope mountain side of a protection fence, (b) is a top view of a protection fence Sectional view of II-II in FIG. Perspective view of the top of the protective fence Model diagram of protective fence when impact is applied Perspective view of horizontal truss structure An illustration of a conventional guard fence, modeling the displacement of the struts and the rope material arranged in multiple stages when an impact is applied

  DESCRIPTION OF EMBODIMENTS Preferred embodiments for carrying out the invention will be described with reference to the drawings.

<1> Overview of the protective fence.
FIG. 1 (a) shows a view of a protective fence to which the present invention is applied as viewed from the slope mountain side, (b) shows a plan view thereof, FIG. 2 shows an upper cross-sectional view of the support column 10, and FIG. The perspective view of the upper part of is shown.

  The guard fence on which the present invention is premised is an H-steel support column 10 (including a terminal support column and an intermediate support column) standing upright at intervals, and a plurality of rope members horizontally mounted between these support columns 10 20 and a net 21 such as a wire mesh attached to the plurality of rope members 20.

  The column 10 is a steel material having a H-shaped cross section composed of a flange 11 and a web 12, and the lower part thereof is directly embedded in the concrete foundation 30 or the slope.

  Both end portions of each rope member 20 are fixed to terminal struts (not shown), and a section between the end portions of each rope member 20 is arranged on the slope mountain side of the intermediate strut 10 and is slid through a fixture 22 such as a U bolt. It is mounted movably.

In the present invention, a plurality of torsional restraint rods 40 are stretched between the upper portions of adjacent struts 10, 10, and the displacement direction of the struts 10 at the time of impact is restricted only to the slope valley side by these torsional restraint rods 40. Suppose a protective fence that restrains the torsion of the column 10.
The present invention is not limited to the existing protective fence, and can be applied to a new protective fence.

<2> Torsional restraint rod.
The torsional restraint rod 40 is a bar material or pipe material having substantially the same length as the span of the column 10 and excellent in tensile strength and compression strength. For example, a bar material such as a reinforcing bar, a PC steel bar, or a pipe material such as a steel pipe. Can be used.
Both ends of the torsional restraint bar 40 have connection portions 41, which can be connected to the mounting jig 50 via the connection portions 41.
In this example, the connecting portion 41 is configured to be detachable from the torsion restricting rod 40.

In this example, the case where the torsional restraint rod 40 is stretched via the mounting jig 50 attached to the upper part of the column 10 will be described. However, the mounting jig 50 is omitted and the torsional constraint rod 40 is directly attached to the flange 11 of the column 10. May be stretched.
Further, the position where the torsional restraint bar 40 is stretched is not limited to the uppermost portion of the column 10, and may be stretched between the middle portions of the column 10. If a plurality of sets of torsional restraint rods 40 are stretched in the height direction with respect to the column 10, the torsional constraint effect of the column 10 is further enhanced.

<3> A mounting jig.
The mounting jig 50 shown in FIGS. 2 and 3 will be described.
The mounting jig 50 includes a fitting part 51 that is externally attached to the support column 10 and an extension plate 52 that is integrally fixed to one end of the fitting part 51.
The fitting portion 51 has a space 53 that can be fitted from above the column 10 having the flange 11 and the web 12, and a plurality of fixing bolts 54 are provided on the plate surface in order to fix the mounting jig 50 to the column 10. Have. A plurality of mounting holes 55 are opened at the four corners of the expansion plate 52.

<4> Horizontal truss structure.
The horizontal truss structure 60 is a structure having both an interval maintaining function for maintaining a constant interval between the pair of torsional restraint rods 40 and 40 and a deformation preventing function for the torsional restraint rod 40 on the mountain side. 62 and a truss member 61 connecting between them.
The horizontal truss structure 60 is provided over the entire length of the torsional restraint rod 40 or in an intermediate portion excluding both ends.
The truss member 61 is a rod-like compression resistant material and transmits the load between the pair of torsional restraint rods 40 and 40 to each other.
The rigid coupling means 62 is a means for fixing the truss member 61 to the torsional restraint rod 40.
In this example, the case where the rigid coupling means 62 is a combination of the fastening pipe 63 and the fixing bolt 64 is shown, but welding, adhesion, or the like may be used.
The rigid coupling means 62 is arranged in a staggered manner on the pair of torsional restraint rods 40, 40. That is, a plurality of rigid coupling means 62 are arranged at equal intervals on one torsional restraint bar 40, and the rigid coupling means 62 is arranged on the other torsional constraint bar 40 at an intermediate position between the rigid coupling means 62 and 62. .

[Tensioning method of torsional restraint rod]
Next, a method for stretching a plurality of torsional restraint rods 40 between the upper portions of adjacent columns 10 and 10 will be described.

<1> Mounting of a mounting jig.
As shown in FIG. 3, the fitting part 51 is put on the upper part of the flange 11 of the column 10 on the upper part of the column 10, and a plurality of fixing bolts 54 provided on the fitting part 51 are tightened to attach the mounting jig 50 to the column 10. Fix to the top of the.

<2> Formation of horizontal truss structure.
A horizontal truss structure 60 is formed between the pair of torsional restraint rods 40, 40.
In order to install the truss structure 60 on the torsional restraint rod 40, the end of the torsional restraint rod 40 from which the connection portion 41 has been removed is inserted into the fastening tube 63 of the rigid coupling means 62, and then the connection portion 41 is twisted. Connect to.
The plurality of rigid coupling means 62 are slid and aligned so that the rigid coupling means 62 are arranged in a staggered manner on the pair of torsional restraint rods 40, 40.
Subsequently, both ends of the truss member 61 are inserted into the fastening pipes 63, 63 of the opposing rigid coupling means 62, 62, and fixed and connected to the fastening pipe 63 with fixing bolts 64. At the same time, the fastening pipe 63 is fixed to the torsional restraint rod 40 with the fixing bolt 64.
The set number and installation position of the horizontal truss structure 60 are appropriately selected in consideration of the span of the column 10 and the like so that the torsional restraint rod 40 does not buckle and deform at the time of impact.

<3> Tensioning the torsional restraint rod.
A pair of torsional restraint rods 40, 40 are bridged between the attachment jigs 50, 50 attached to the upper portions of adjacent struts 10, and both ends of the torsional restraint rods 40 are attached to the attachment jigs 56 by connecting elements 56 such as bolts and pins. 50 is pivotally connected.
The connection portions 41 of the torsional restraint rods 40 after connection allow relative displacement with respect to the mounting jig 50.

  Although illustration is omitted, if a length adjusting bracket such as a turn buckle is interposed in a part of the torsional restraint rod 40, an error in the standing interval between the columns 10 can be absorbed on site.

Finally, as shown in FIG. 1B, two torsional restraint rods 40 are stretched between the upper portions of the adjacent columns 10 so as to be parallel to each other.
A pair of front and rear torsional restraint rods 40 are stretched between the upper portions of all the columns 10 or over a limited section requiring reinforcement, thereby completing the reinforcement of the protective fence.

<4> Spacing maintaining action and deformation preventing action of horizontal truss structure.
Based on FIG. 4, the space | interval holding | maintenance effect | action of the horizontal truss structure body 60 and a deformation | transformation prevention effect | action are demonstrated.
When an impact F acts on the protective fence, a torsional force acts on the column 10 located in the receiving section.
When a torsional force is applied to the support column 10, a tensile force is generated in the torsion restraining rod 40 on the slope valley side, and a compressive force is generated in the torsional restraining rod 40 on the slope mountain side.
If the horizontal truss structure 60 is not installed, the torsion restraint rod 40 on the slope mountain side may be buckled, but in the present invention, the distance between the pair of torsion restraint rods 40 and 40 is kept constant. A horizontal truss structure 60 that opposes the compressive deformation is arranged.
Since the horizontal truss structure 60 is formed by rigidly connecting the truss member 61 with the rigid coupling means 62, the truss member 61, which is a compression resistant material, is used as the trough member 61 on the trough side. 40 and the buckling deformation of the torsional restraint rod 40 on the mountain side can be reliably prevented.
The horizontal truss structure body 60 of the present application can simultaneously achieve the function of maintaining the distance between the pair of torsional restraint rods 40 and 40 and the deformation prevention of the torsional restraint rod 40 on the mountain side.

<5> Action of a twist restraint rod.
When an impact F acts on the protective fence, a force directed toward the slope valley and a force directed in the extending direction of the protective fence are applied to the support column 10 located in the receiving section.
In the present invention, a pair of torsional restraint rods 40, 40 are stretched between the upper portions of adjacent struts 10 to reinforce the struts 10, so that the force in the extension direction of the protective fence is applied to the upper portion of each strut 10. It is supported by the adjacent column 10 by a pair of torsional restraint rods 40, 40 stretched between them. Therefore, the support | pillar 10 located in a receiving area is displaced toward the slope valley side, without twisting.
In other words, the pair of torsional restraint rods 40, 40 restrains the torsion (rotational moment) of the column 10. This displacement of the strut 10 is transmitted to the struts 10 other than the receiving section via the torsion restraint rod 40, so that all struts 10 to which the force is transmitted are similarly displaced toward the slope valley side, Restrain displacement in the direction of extension of the protective fence.

As described above, while preventing buckling deformation of the torsional restraint rod 40 by the horizontal truss structure body 60, the upper portions of the adjacent columns 10 and 20 are reinforced through the pair of torsional restraint rods 40 and 40, The strength against bending deformation of the column 10 can be sufficiently exhibited.
In this way, in the guard fence in which a pair of torsional restraint rods 40, 40 are stretched between the upper portions of the adjacent struts 10, the torsion of the struts 10 can be controlled, so that the receiving performance can be fully exhibited. .

10 ··· strut 20 · · · rope material 40 · · · torsion restraint rod 50 · · · mounting jig 60 · · · horizontal truss structure 61 · · · truss Material 62 ... Rigid means 63 ... Clamping pipe 64 ... Fixing bolt

Claims (4)

In a protective fence in which a pair of twisted restraint rods are stretched between the upper parts of adjacent H steel columns,
A horizontal truss structure is constituted by the pair of torsional restraint rods and a plurality of truss members rigidly coupled across the pair of torsional restraint rods,
Guard fence.   The protective fence according to claim 1, wherein the means for rigidly connecting the truss member to the torsional restraint rod is a bolt fastening.   The protective fence according to claim 1, wherein the means for rigidly connecting the truss member to the torsional restraint rod is welding.   The protective fence according to any one of claims 1 to 3, wherein the truss member is a bar member or a pipe member.

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