JP2020084645A - Pole for guard fence and guard fence - Google Patents

Abstract

To provide a pole for a guard fence, and a guard fence capable of securing a clearance limit while suppressing the projection of the pole for the guard fence to the sidewalk to realize smooth passage on a sidewalk, and also securing sufficient shock absorption capacity.SOLUTION: A pole for a guard fence 2 to which the present invention is applied is composed mainly of a front side flange 25, a rear side flange 26, and a connection piece 27, and a horizontal distance H from a front edge Gf of a ground covering concrete G to a forefront surface of a horizontal member 3 has a clearance of 250 mm or more secured therefor, which is a clearance limit. Further, the rearmost surface of the rear side flange 26 is configured not to project to the side of a sidewalk B beyond the imaginary vertical line passing through the rear edge Gt of the ground covering concrete G. This makes it possible to realize smooth passage on the sidewalk while satisfying the clearance limit.SELECTED DRAWING: Figure 2

Description

The present invention relates to a protection fence support and a protection fence. In detail, while maintaining the building limit, it is possible to suppress the overhanging of the protective fence post to the sidewalk, to achieve smooth passage on the sidewalk, and to secure a sufficient shock absorption capacity. It concerns fences.

Generally, roads are equipped with various safety devices for protecting vehicles passing on roads and pedestrians walking on sidewalks. Among these safety devices, as a typical example, it prevents the vehicle from falling over the side edge of the roadway to the outside of the road and achieves the purpose of protecting pedestrians from vehicles that enter the sidewalk. Protective fences are installed at the side edges of the road.

Such a protective fence is constructed, for example, by arranging a plurality of protective fence posts upright on the ground-covered concrete on the side edge of the road via a base plate, and between the adjacent protective fence posts, one steel pipe or the like is used. Or, a structure in which a plurality of horizontal members are bridged and attached by a fixture is general (Patent Document 1).

By the way, from the viewpoint of preventing the vehicle from falling, it is preferable that the strength and rigidity of the protective fence be as large as possible, but if it is larger than necessary, the impact at the time of a collision may seriously damage the driver or the passenger, In addition, a vehicle that comes into contact with or collides with the protective fence may be bounced by the protective fence and spun on the side of the road, causing a secondary disaster.

Therefore, in recent years, from the viewpoint of not only increasing the strength and rigidity more than necessary, but also ensuring the safety of the occupants and pedestrians of the vehicle, the collision energy when the vehicle comes into contact or collides is highly efficiently absorbed. The technical development of the shape and material of the protective fences is actively carried out.

For example, according to Patent Document 1, as shown in FIG. 4, a protection fence post 102 that supports a horizontal member 101 is composed of front and rear flanges 103 and 104, and the front and rear flanges 103 and 104 are the base plates. The curved portion 106 is formed so as to be slightly curved from 105 to the upper side in the vertical direction toward the back side.

According to this patent document 1, for example, when a vehicle collides with a protective fence and a load is applied, the collision energy is first absorbed by the crushing and bending deformation of the horizontal member 101, and then the protective fence column 102. Collision energy can be effectively absorbed by elastic deformation based on the curved portion 106 and plastic deformation such as buckling, and the load energy can be dispersed to other portions. This minimizes damage to the driver and passengers and prevents the vehicle from bouncing back toward the roadway.

JP, 2014-141878, A

By the way, with regard to the installation of protective fences, it is necessary to satisfy various building limits specified by the Road Structural Ordinance regarding the range where protective fences should not be installed so as not to hinder smooth traffic. As one of the construction limits, for example, as the installation position of the protective fence, it is required to secure a predetermined clearance (for example, 250 mm) from the front edge (road side) of the ground cover concrete.

In this regard, in the protective fence post described in Patent Document 1, since the curved portions of the front and rear flanges are convex toward the sidewalk, the protective fence post is configured to secure the above-mentioned construction limit. The rear flange overhangs the sidewalk side rather than the sidewalk side of the ground cover concrete where the protection fence support is installed.

Therefore, there is no problem if the sidewalk is relatively wide, but for example, in the case of a narrow sidewalk, a part of the protection fence props protruding toward the sidewalk will hinder pedestrians when passing the sidewalk, and This is one of the causes that hinder the smooth passage of pedestrians on the severe sidewalks.

On the other hand, if the shape of the curved portion is approximated to a linear shape in order to suppress the protrusion to the sidewalk, the shock absorbing effect will be weakened. Further, it is conceivable to install the protective fence by shifting it to the front edge side of the ground cover concrete, but in this case, there is a possibility that the above-mentioned construction limit may not be satisfied.

The present invention has been devised in view of the above points, and can suppress the overhang of the protection fence pillar to the sidewalk side while ensuring the building limit, and can achieve smooth passage on the sidewalk and impact. The purpose is to provide a protection fence column and a protection fence with sufficient absorption capacity.

In order to achieve the above-mentioned object, a prop for a protective fence of the present invention comprises a base plate installed on ground-covering concrete having a width direction in the lane direction of the roadway, and a roadway side front edge of the ground-covering concrete. At a position separated by a predetermined horizontal distance in the width direction toward the rear which is the opposite side, a front flange that is erected on the base plate substantially vertically upward, and on the rear side of the front flange. , And a position on the front side of the rear edge opposite to the roadside side of the ground cover concrete, facing the front flange and a rear flange erected substantially vertically upward on the base plate. , A connecting piece for connecting the front side flange and the rear side flange.

Here, by providing the base plate installed on the ground covering concrete having the width direction in the lane direction of the road, the protection fence support can be firmly fixed to the ground covering concrete.

In addition, as a part of the protection fence support, it has a front flange on the base plate that is erected approximately vertically upward. In addition to being able to be absorbed, a horizontal member can be attached to the front flange.

Further, when the front side flange is installed at a position separated by a predetermined horizontal distance in the width direction from the front edge of the ground cover concrete on the side of the roadway toward the rear opposite to the roadway, for example, in the Road Structure Ordinance. Horizontal members can be supported so as to meet the specified building limits.

In addition, as a part of the protection fence support, it has a rear flange on the base plate that is erected substantially vertically upward, so that collision energy when a vehicle collides with the protection fence support can be reduced. Can be absorbed efficiently.

In addition, the rear side flange is installed at a position in front of the rear edge of the ground cover concrete on the side opposite to the roadway side, so that the rear side flange overhangs on the sidewalk side, which is the side opposite the roadway side. It is possible to suppress traffic and realize smooth passage for pedestrians when passing on a sidewalk.

Further, since the rear side flange is erected so as to face the front side flange, it is possible to provide a strong structure for the entire protection fence post.

Further, by providing the connecting piece that connects the front flange and the rear flange, the front flange and the rear flange can be integrated, and the load input to the front flange is transmitted to the rear flange through the connecting piece. The collision energy when the vehicle collides with the protection fence pillar can be efficiently transmitted to each flange.

Further, the front flange is fixed to the base plate and extends vertically upward. The first front vertical piece is an upper end portion of the first front vertical piece, and the upper end portion of the first front vertical piece serves as a first front bending portion. A front inclined piece extending obliquely upward and rearward, and a second front vertical piece extending vertically upward from the second front bent portion with the upper end portion of the front inclined piece as a second front bent portion In this case, when collision energy is input to the front flange, the front flange as a whole is plastically deformed so as to extend in the lengthwise direction with the first front bent portion and the second front bent portion as base points.

In this way, when collision energy is input to the front flange, the entire front flange is plastically deformed so as to extend in the longitudinal direction, so that the collision energy is efficiently absorbed and the local energy to the base plate is absorbed. It is possible to avoid concentration of various stresses. Therefore, for example, when fixing the base plate to the ground cover concrete with anchor bolts or the like, even if a short anchor bolt is used, the anchor bolt is unlikely to break depending on the installation conditions.

Further, the rear side flange is fixed to the base plate and extends vertically upward, and the first rear side vertical piece has the upper end portion of the first rear side vertical piece as the first rear side bent portion. A rear inclined piece extending vertically upward and rearward from the side bent portion, and an upper end portion of the rear inclined piece as a second rear bent portion extending vertically upward from the second rear bent portion. When the collision energy is input to the rear side flange, the second rear side vertical piece is used as a starting point, and the rear side flange and the second rear side bent portion serve as base points. The whole is plastically deformed so as to buckle in the length direction.

In this way, when collision energy is input to the rear flange, the entire rear flange buckles in the lengthwise direction, so that the collision energy is efficiently absorbed and local stress on the base plate is reduced. You can avoid concentration. Therefore, for example, when fixing the base plate to the ground cover concrete with anchor bolts or the like, even if a short anchor bolt is used, the anchor bolt is unlikely to break depending on the installation conditions.

In addition, when the height positions of the first front bent portion and the second rear bent portion are substantially the same, the front flange and the rear flange when the collision energy is input to the protection fence column are Since the plastic deformation becomes remarkable, the collision energy can be efficiently absorbed and the stress concentration on the anchor bolt can be avoided more effectively.

In addition, when the height position of the second front bent portion is a position higher than the height position of the second rear bent portion by a predetermined amount, the collision energy when the collision energy is input to the protection fence column is increased. Since the plastic deformation of the front flange and the rear flange becomes remarkable, the collision energy can be efficiently absorbed and the stress concentration on the anchor bolt can be more effectively avoided.

Further, in the case where the second front vertical piece is provided with the attachment portion for attaching the horizontal member, the horizontal member for forming the protective fence can be easily attached to the front flange.

In order to achieve the above-mentioned object, the protective fence of the present invention comprises a horizontal member, a base plate installed on the ground covering concrete having the lane direction of the roadway as the width direction, from the front edge of the ground covering concrete on the roadway side. A front flange that supports the horizontal member at a position where the horizontal distance to the forefront of the horizontal member is approximately 250 mm or more, and stands upright on the base plate substantially vertically upward, and rearward of the front flange. Side, and a position on the front side of the trailing edge on the side opposite to the roadside of the ground cover concrete, facing the front flange and standing upright on the base plate substantially vertically upward. A flange, and a protection fence support having a connecting piece for connecting the front side flange and the rear side flange.

Here, by providing the horizontal member, even when the vehicle collides with the protective fence, the vehicle can be prevented from entering the sidewalk and the collision energy can be efficiently absorbed.

Further, by providing the base plate installed on the ground covering concrete whose width direction is the lane direction of the roadway on the front side, it is possible to firmly fix the protection fence column to the ground covering concrete.

In addition, as a part of the protection fence support, it has a front flange on the base plate that is erected approximately vertically upward. In addition to being able to be absorbed, a horizontal member can be attached to the front flange.

In addition, if the front flange supports the horizontal bridge at a position where the horizontal distance from the front edge of the road cover side of the ground cover concrete to the forefront of the horizontal bridge is approximately 250 mm or more, the road structure ordinance determines it. You can meet the architectural limits that are present.

In addition, as a part of the protection fence support, it has a rear flange on the base plate that is erected substantially vertically upward, so that collision energy when a vehicle collides with the protection fence support can be reduced. Can be absorbed efficiently.

In addition, the rear side flange is installed at a position in front of the rear edge of the ground cover concrete on the side opposite to the roadway side, so that the rear side flange overhangs on the sidewalk side, which is the side opposite the roadway side. It is possible to suppress traffic and realize smooth passage for pedestrians who walk on the sidewalk.

Further, since the rear side flange is erected so as to face the front side flange, it is possible to provide a strong structure for the entire protection fence post.

The protection fence post and the protection fence according to the present invention can suppress the protrusion of the protection fence post to the sidewalk while ensuring the building limit, and can realize smooth passage on the sidewalk, and also have an impact absorbing power. You can secure enough.

It is a perspective view of the protection fence which concerns on embodiment of this invention, (a) is an assembly completion view seen from a roadway side, (b) is an exploded view seen from a sidewalk side. It is a cross-sectional view of a protection fence post according to an embodiment of the present invention. It is a figure which shows the deformation|transformation state of the support|pillar for the protection fence which concerns on embodiment of this invention, (a) is a figure before a deformation|transformation, and (b) is a figure after a deformation|transformation. It is a figure which shows a prior art.

Hereinafter, an embodiment of the present invention relating to a support for a protective fence and a protective fence will be described with reference to the drawings to provide an understanding of the present invention.

First, the overall configuration of the protective fence 1 according to the embodiment of the present invention will be described based on FIG. The protective fence 1 is a protective fence post 2 that is installed at a predetermined interval in the length direction of the ground covering concrete G provided along the side edge of the road R, and each protective fence post 2 is provided. It is composed of a horizontal member 3 spanned between them.

In the following description, for convenience of description, the lane direction of the roadway R (that is, the lateral direction of the ground covering concrete G) is the width direction of the ground covering concrete G, and the side surface of the ground covering concrete G on the roadway R side is the front edge. A side surface opposite to Gf and the road R is defined as a trailing edge Gt. The side opposite to the road R with the ground covering concrete G sandwiched between them is referred to as a sidewalk B. When the protection fence support pillar 2 is installed on the ground covering concrete G, the roadway R side of the protection fence support pillar 2 is a front sidewalk. The B side is called back.

Next, the protection fence support 2 will be described in detail. The protection fence support 2 mainly includes a base plate 21, a front flange 25, a rear flange 26, and a connecting piece 27.

The base plate 21 is a plate-shaped body made of steel and has a substantially rectangular shape, and is fixed on the ground covering concrete G via anchor bolts 22. The base plate 21 is formed with a plurality of insertion holes 23 (four in FIG. 1) which are long holes for inserting the anchor bolts 22. Specifically, two long holes are formed on the front side of the base plate 21 along the longitudinal direction of the ground covering concrete G, and on the rear side, the two long holes form a substantially C shape in a plan view. Is formed in.

Here, the insertion hole 23 formed in the base plate 21 does not necessarily have to be a long hole. If the anchor bolt 22 can be inserted, for example, a round hole or an insertion hole having another shape may be formed. In addition, when the shape of the insertion hole 23 is a long hole, the positioning of the base plate 21 with respect to the ground covering concrete G becomes easy.

The anchor bolt 22 inserted through the insertion hole 23 of the base plate 21 is embedded to a predetermined depth in the ground covering concrete G, and is tightened and fixed by the nut 24, so that the base plate 21 is firmly fixed to the ground covering concrete G. Can be fixed.

The front flange 25 is made of steel, and is a plate-shaped member that stands upright from the base plate 21 in a substantially vertical direction. The front flange 25 is fixed to the base plate 21 by welding.

Here, the method of fixing the front flange 25 to the base plate 21 does not necessarily have to be welding fixation. For example, a mounting flange may be provided on the bottom surface of the front side flange 25, and an anchor bolt may be inserted through the flange to be fixed to the base plate 21.

The front flange 25 is fixed to the base plate 21 and extends vertically upward from the bottom surface. The first front vertical piece 25a and the upper end portion of the first front vertical piece 25a are used as the first front bent portion 25b. A front inclined piece 25c extending vertically upward and obliquely rearward from the first front bent portion 25b, and an upper end portion of the front inclined piece 25c is defined as a second front bent portion 25d, and is vertically upward from the second front bent portion 25d. The second front vertical piece 25e extending toward the front side is composed of three main parts.

The second front vertical piece 25e is provided with three mounting portions (not shown) which are recessed in a substantially arc shape for mounting and supporting the horizontal member 3 in the vertical direction. The horizontal member 3 is fitted into this mounting portion, and is supported by the front flange 25 by bolts (not marked) and nuts (not marked).

At this time, the horizontal distance H from the front edge Gf of the ground covering concrete G to the forefront of the horizontal member 3 is secured to be about 250 mm or more. That is, as described above, since the horizontal member 3 is installed with a sufficient distance from the front edge of the ground cover concrete G, it is a specification that meets the building limit required by the Road Structure Ordinance, for example. .

The rear flange 26 is made of steel, and is formed of a plate-like member that stands upright from the base plate 21 in a substantially vertical direction. Although the rear flange 26 is fixed to the base plate 21 by welding, the fixing method is not limited to the same as the front flange 25.

The rear flange 26 is fixed to the base plate 21 and extends vertically upward from the bottom surface of the first rear vertical piece 26a, and the upper end portion of the first rear vertical piece 26a is a first rear bent portion. As the reference numeral 26b, a rear inclined piece 26c extending vertically upward and obliquely rearward from the first rear bent portion 26b, and an upper end portion of the rear inclined piece 26c is used as a second rear bent portion 26d. The second rear vertical piece 26e extending vertically upward from the rear bent portion 26d is composed of three large portions.

As shown in FIG. 2, the rear side flange 26 is installed on the ground covering concrete G so as not to protrude from the trailing edge Gt of the ground covering concrete G (virtual vertical line passing through the rear edge Gt) to the sidewalk B side. Has been done. Therefore, it is possible to prevent the rear side flange 26 from protruding to the sidewalk B, so that it is possible to prevent a pedestrian passing through the sidewalk B from being obstructed even in a narrow sidewalk. That is, as described above, it is possible to realize the protective fence post 2 that can satisfy the building limit and can be prevented from projecting to the sidewalk.

The connecting piece 27 connects the front side flange 25 and the rear side flange 26. The connecting piece 27 is made of steel and is a plate-like member that stands upright vertically from the base plate 21. The connecting piece 27 has a widthwise center of the front flange 25 and a widthwise center of the rear flange 26. The loads connected to the front side flange 25 are efficiently transmitted to the rear side flange 26 via the connecting piece 27.

Here, the connecting piece 27 does not necessarily have to be composed of one plate-shaped body. For example, the front flange 25 and the rear flange 26 may be partially connected in the height direction.

Next, the positional relationship between the front flange 25 and the rear flange 26 will be described in detail with reference to FIG. As shown in FIG. 2, the first front bent portion 25b and the first rear bent portion 26b, which are bottom portions, are set to have substantially the same height in the vertical direction. On the other hand, the height position of the second front bent portion 25d is set higher than the height position of the second rear bent portion 26d. That is, the second front bent portion 25d is set to be located vertically above the second rear bent portion 26d.

Here, the positional relationship between the first front bent portion 25b and the first rear bent portion 26b, and the second front bent portion 25d and the second rear bent portion 26d does not necessarily have to be the above relationship. Absent. However, with the above configuration, it is possible to efficiently disperse the collision energy when a load acts on the protective fence and avoid excessive concentration of stress on the anchor bolts and the like. The detailed mechanism will be described later.

The horizontal member 3 has a substantially columnar rod shape, is fitted into the mounting portion of the front flange 25 as described above, and is firmly fixed by bolts and nuts.

In the protective fence 1 configured as described above, for example, a deformation process of the protective fence post 2 when a vehicle (not shown) rides on the ground covering concrete G and collides with the protective fence 1 will be described with reference to FIG. Note that FIG. 3A shows a state before deformation, and FIG. 3B shows a state after deformation.

When the vehicle collides with the protective fence 1, a load is first applied to the front side flange 25 and the vehicle falls down rearward. Plastically deforms to stretch to.

In this way, the collision energy is dispersed in the longitudinal direction of the front flange 25 by plastically deforming the front flange 25 so as to extend in the longitudinal direction. Therefore, of the collision energy acting on the front flange 25, stress concentration on the base plate 21 side can be avoided.

The collision energy acting on the front flange 25 is transmitted from the connecting piece 27 to the rear flange 26. When the collision energy is transmitted to the rear side flange 26, the rear side flange 26 as well as the front side flange 25 falls backward. At this time, the rear side flange 26 is crushed (buckled) in the direction in which the entire rear side flange 26 contracts starting from the first rear side bent portion 26b and the second rear side bent portion 26d.

As described above, the front flange 25 is plastically deformed so as to extend in the length direction, and the rear flange 26 is plastically deformed so as to be buckled, whereby the collision energy can be efficiently absorbed or dispersed. .. In particular, excessive stress concentration on the base plate 21 can be avoided.

That is, in the conventional protection fence column, when excessive stress is concentrated on the base plate 21, the anchor bolts 22 that fix the base plate 21 are broken, and as a result, the base plate 21 comes off from the ground cover concrete G, and the vehicle moves on the sidewalk. There was a risk that it would enter the B side. However, in the embodiment of the present invention, it is possible to avoid excessive stress concentration on the base plate 21, so that the anchor bolt 22 is prevented from being broken, and even if the vehicle collides, the base plate 21 does not cover the concrete G. Since the vehicle can be kept fixed to the side, it is possible to prevent the vehicle from entering the sidewalk B side.

Further, as described above, when installed on the ground cover concrete G, it can meet the building limit required by the Road Structure Ordinance and can also prevent overhanging on the sidewalk B, so that shock absorption and smooth passage of the sidewalk B can be achieved. It is possible to achieve both.

As described above, the protective fence post and the protective fence to which the present invention is applied can prevent the protective fence post from projecting to the sidewalk while ensuring the building limit, and can realize smooth passage on the sidewalk. At the same time, it is possible to secure a sufficient shock absorbing power.

1 Guard fence 2 Strut for guard 21 Base plate 22 Anchor bolt 23 Insertion hole 24 Nut 25 Front flange 25a First front vertical piece 25b First front bent portion 25c Front inclined piece 25d Second front bent portion 25e Second Front vertical piece 25f Mounting portion 26 Rear flange 26a First rear vertical piece 26b First rear bent portion 26c Rear tilted piece 26d Second rear bent portion 26e Second rear vertical piece 27 Connecting piece 3 Horizontal material R Roadway G Ground cover concrete Gf Front edge Gt Rear edge B Sidewalk

Claims (6)

A base plate installed on the ground cover concrete whose width direction is the lane direction of the roadway,
At a position separated by a predetermined horizontal distance in the width direction from the front edge of the ground cover concrete on the side of the roadway toward the rear opposite to the roadway, it was erected substantially vertically upward on the base plate. Front flange,
At a position rearward of the front flange and at a position forward of a rear edge of the ground cover concrete opposite to the roadside, facing the front flange and facing substantially vertically upward on the base plate. The rear side flange installed upright,
A protection fence post comprising: a connecting piece that connects the front flange and the rear flange. The front flange is
A first front vertical piece that is fixed to the base plate and extends vertically upward, and an upper end portion of the first front vertical piece serves as a first front bent portion, and is vertically upward and obliquely rearward from the first front bent portion. And a second front vertical piece extending vertically upward from the second front bent portion with the upper end portion of the front tilted piece as a second front bent portion. ,
The rear flange is
A first rear vertical piece fixed to the base plate portion and extending vertically upward, and an upper end portion of the first rear vertical piece as a first rear bent portion, and the second rear bent portion. A rear inclined piece extending vertically upward and obliquely rearward from the second inclined portion, and an upper end portion of the rear inclined piece as a second rear bent portion extending vertically upward from the second rear bent portion The support fence post according to claim 1, comprising a second rear vertical piece. The protection fence post according to claim 2, wherein the first front bent portion and the second rear bent portion have substantially the same height position. The protection fence post according to claim 2 or 3, wherein the height position of the second front bent portion is a position higher than the height position of the second rear bent portion by a predetermined amount. The support fence post according to any one of claims 2 to 4, wherein a mounting portion for mounting a horizontal member is formed on the second front vertical piece. Horizontal material,
The base plate installed on the ground cover concrete whose width direction is the lane direction of the road, the horizontal distance from the front edge of the road cover side of the ground cover to the forefront of the horizontal member is about 250 mm or more. A front side flange that supports a bridge and is erected on the base plate substantially vertically upward, a rear side of the front side flange and a front side of a rear edge of the ground cover concrete opposite to the road side. At the position of, and a guard fence post having a rear flange facing the front flange and erected substantially vertically upward on the base plate, and a connecting piece that connects the front flange and the rear flange. And, with a support fence post.

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