JP2004156426A - Shock absorbing structure for guardrail - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a shock absorbing structure for a guardrail, which is simple, absorbs and disperses a shock caused by a collision of a vehicle to prevent toppling of a strut and a balustrade, and dispenses with digging the ground at a location of a foundation, and resetting a new strut and a new guardrail. <P>SOLUTION: The guardrail consists of a plurality of struts 12, a guard fence 14, and intermediate members 16. The struts 12 are erected on the ground in a row. The guard fence 14 is horizontally mounted on the struts 12 in a manner extending across the same by facing its rear surface to a side surface of each strut 12. Each intermediate member 16 is formed like the ohm or a pipe having upper and lower openings, and arranged between each strut 12 and the guard fence 14, and attached to the former and the latter by means of fastening fixtures 17, 18, to thereby absorb and disperse impact energy caused by the collision of the vehicle, by irreversible deformation (plastic deformation) of the intermediate member 16. The structure may be mounted on, e.g. a utility pole, a signal pole, a bifurcation point between a trunk road and a by-pass, a collision preventing portion before a tollbooth of an expressway, and a surface of a structure (inclusive of a concrete structure), such as a partition wall in a parking area, in a manner covering the same, in place of on the strut 12. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
INDUSTRIAL APPLICABILITY The present invention is applied to a guardrail or a balustrade of a bridge installed on a road side portion or a median strip of a road, and absorbs and disperses an impact due to a vehicle collision to form a guardrail or a balustrade constituting a bridge. The present invention relates to a shock absorbing structure for preventing a fall.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a guardrail is installed beside a road to prevent a vehicle from jumping out of a roadway to a sidewalk or the like due to, for example, an error in steering wheel operation or a collision with another vehicle.
[0003]
In the conventional card rail 1, generally, a high rigid intermediate space member 6 is provided between the long fence 4 and the support column 2, and the installation interval of the support column 2 is further narrowed to increase the rigidity of the entire guard rail 1, thereby causing a collision. It is intended to absorb the energy of the vehicle mainly by deformation of the column 2 (see FIG. 7).
[0004]
On the other hand, the column is formed of an elastic body that can be elastically restored (for example, see Patent Document 1), and a plurality of connected tubes are provided inside the cushion cover as an absorbing material, and these tubes are arranged so as to surround the column. (See, for example, Patent Document 2), a structure in which a surface that ultimately receives impact energy is strong, and other surfaces are relatively easily broken (deformed) (for example, see Patent Document 3) has also been proposed. I have.
[0005]
[Patent Document 1]
JP-A-6-280222 (Claims, Claim 1)
[Patent Document 2]
JP-A-7-150529 (Claims, Claim 1)
[Patent Document 3]
JP-A-10-18257 (FIGS. 1 to 8)
[0006]
[Problems to be solved by the invention]
However, the feature common to the currently installed guardrails described above has the effect of decelerating the vehicle and slightly reducing the impact at the time of column collision, but the column itself has almost no function of absorbing the impact, This is to increase the rigidity of the guardrail as a whole, and to absorb the energy of the crashing vehicle mainly by deformation or falling down of the pillar.
[0007]
In this case, it is necessary to secure an area required for the pillar 1 to fall down in advance as an exclusive area of the guardrail. If this is not ensured enough, it will harm vehicles traveling in the opposite lane and pedestrians outside the guardrail.
[0008]
Further, when the energy of the collision vehicle is excessive, the possibility of the collision vehicle riding on or breaking through the guardrail due to the fall of the support increases, and the danger of a secondary disaster increases. In addition, when the support pillars are greatly collapsed, the swelling of the collision vehicle to the outside of the traveling lane becomes large, and it is difficult to safely guide the vehicle after the collision and return to the original traveling lane.
[0009]
Furthermore, even if it tries to straighten a bent support, it will break from that part. In such a case, it is necessary to remove the damaged portion, re-dig the foundation, install a new support, and install a new guardrail, which is not only troublesome but also uneconomical. .
[0010]
In addition, if the support is left in a damaged and destroyed state, there is a possibility that another vehicle or a pedestrian will pass and a secondary accident will occur.
[0011]
On the other hand, if the rigidity of the column is increased to suppress the deformation, the energy of the collision vehicle cannot be sufficiently absorbed, so that the impact force at the time of the collision increases and a problem arises in terms of ensuring the safety of the occupant.
[0012]
Next, although the strut provided with an elastic body has the effect of decelerating and slightly mitigating the impact at the time of striking the strut, when it collides and stops, the original shape of the elastic body has its own elasticity. There is a problem that the self-restoring property to be restored to the driver is transmitted to the driver, which may cause a serious secondary disaster.
[0013]
The present invention has been intensively studied in view of the above circumstances, and its purpose is to absorb and disperse the impact of a vehicle collision to prevent a pillar or balustrade from overturning, and to dig a new part by re-digging a foundation. It is an object of the present invention to provide a shock absorbing structure for a guardrail that does not require the installation of a support post and the re-installation of a new guardrail, with a simple structure.
[0014]
[Means for Solving the Problems]
Means adopted by the present invention to solve the above-mentioned problem is that the invention according to claim 1 is characterized in that a plurality of pillars erected in a row on the ground and the back surface is directed to the side surfaces of these pillars. Either a substantially Ω-shaped intermediate spacer or a pipe-shaped intermediate spacer having an open top and bottom is disposed between the guard fence and the guard fence installed horizontally across the struts. The gist of the present invention is a shock absorbing structure of a guardrail, which is attached to each of the fences and is characterized by absorbing and dispersing the impact energy due to a vehicle collision by irreversible deformation of the intermediate spacer.
[0015]
The invention according to claim 2 provides a substantially Ω-shaped intermediate spacing member between a structure erected on the ground and a guard fence attached with its back side facing the front side of these structures. Either one of the pipe-shaped intermediate spacers that open at the top and bottom is arranged, and is attached to each of the columns and guard fences with fasteners. The irreversible deformation of the intermediate spacers causes impact energy due to vehicle collision. The gist of the present invention is a shock absorbing structure of a guardrail having a feature of absorbing and dispersing the air.
[0016]
The gist of the invention of claim 3 is that the shock absorbing structure of the guardrail according to claim 1 or 2, further comprising a shock absorbing pipe or a shock absorbing resin mounted on the intermediate spacer.
[0017]
According to a fourth aspect of the present invention, in the shock absorbing structure according to the second or third aspect, the structure erected on the ground is a telephone pole, a signal pole, a branch point of a branching road, a collision prevention unit, and a parking lot. Any one selected from the group including the partition wall of the above shall be the gist.
[0018]
The gist of the shock absorbing structure according to any one of claims 1 to 4, wherein the intermediate spacer is formed by stacking a plurality of the substantially Ω-shaped intermediate spacers. .
[0019]
ADVANTAGE OF THE INVENTION According to the shock-absorbing structure of the guardrail which concerns on this invention, the deformation | transformation of the whole guardrail and the irreversible deformation of an intermediate | middle spacer can mutually absorb and disperse the energy of a collision vehicle. That is, the impact at the time of strut collision can be reduced by decelerating the collision vehicle.
[0020]
Further, since the elastic body is not provided, the self-restoring property of the elastic body is not transmitted to the driver. That is, it is possible to prevent a secondary disaster caused by the self-restoration transmitted to the driver.
[0021]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to examples. However, the examples are merely representative examples, and the present invention is limited by the following examples unless departing from the gist thereof. Instead, it can be implemented with various design changes.
[0022]
FIG. 1A is a side view of a shock absorbing structure 10 according to a first embodiment of the present invention, and a guard fence is illustrated as a cross section. FIG. 1B is a cross-sectional view of a main part of the shock absorbing structure 10 of FIG.
[0023]
In the figure, a shock absorbing structure 10 is provided between a plurality of pillars 12 erected in a row at a required interval in a row along a road, and the pillars 12 with the back side facing the side faces of the pillars 12. It has a guard fence 14 that is attached horizontally and horizontally, and an intermediate spacer 16 disposed between the column 12 and the guard fence 14, and the column 12 and the intermediate spacer 16 are connected by a first fastener 17. The guard fence 14 and the intermediate spacer 16 are fastened and fixed by second fasteners 18 respectively.
[0024]
The column 12 is made of a steel material in the form of a hollow pipe and subjected to surface rust-proofing treatment. A foundation is formed by casting concrete near the road, and a lower portion is embedded and fixed to the foundation. Further, a through hole 17 a through which the first fastening member 17 passes is formed in the upper part of the support 12.
[0025]
The guard fence 14 is made of a steel material having a rust-proof coating formed in a deck plate shape bent at a predetermined interval, and penetrates a second fastener 18 for fastening and fixing to an intermediate spacer 16 described later. A through hole 18a is formed.
[0026]
The intermediate spacer is composed of an energy absorbing pipe 16a having a closed cross section such as an elliptical shape and plastically deforming, and two arm members 16b welded and fixed at positions arranged toward the guard fence 14 side. In the two arm members, a through hole 19 is formed at a position corresponding to the through hole 18a of the guard fence 14.
[0027]
However, for example, between the support 12 and the guard fence 14, the energy absorbing pipe 16a is configured to be directly fastened and fixed by the fastening fittings 17 'and 18' (see FIG. 3) (this is a second embodiment). The shock absorbing structure 10 ′) can be implemented by appropriately changing the design.
[0028]
The material, dimensions, shape, etc. of the support, the guard fence, the intermediate spacing member 16 and the like are set so that the most appropriate cushioning effect and vehicle guidance can be obtained in consideration of the type, speed, weight, etc. of the assumed collision vehicle. The design can be changed as appropriate.
[0029]
According to the shock absorbing structure 10, when a vehicle collides with the guard rail, the energy absorbing pipe 16a plastically deforms to absorb the energy of the colliding vehicle and reduce the impact (see FIG. 2). That is, since the collision energy can be absorbed and reduced by the deformation of the energy absorbing pipe 16a, the strut is not easily bent. Further, after the collision energy is absorbed and alleviated to some extent by the deformation of the energy absorbing pipe 16a, an energy load is applied to the support, so that the support is unlikely to fall.
[0030]
For this reason, there is no need for the installation work such as re-digging the foundation portion, removing the bent pillar, and re-installing a new pillar, which is economically advantageous.
[0031]
In addition, when a vehicle having a speed and weight greater than expected is crushed, the collision energy can be absorbed by deforming or falling down of the columns.
[0032]
If the rigidity of the energy absorbing pipe is increased to reduce its deformation, the impact force at the time of the collision may increase due to insufficient absorption of the energy of the colliding vehicle, which may cause a problem in terms of ensuring the safety of the occupants. is there.
[0033]
FIG. 4 is a sectional view of a main part of a guardrail (shock absorbing structure) 20 according to a second embodiment of the present invention.
[0034]
In the figure, the shock absorbing structure 20 is the same as the guard rail except that the intermediate spacer 26 is formed integrally with the energy absorbing pipe 16a and the two arm members 16b in a substantially ohmic shape. (Shock absorbing structure) It is substantially the same as 10.
[0035]
Also, as shown in FIG. 5, large and small intermediate spacers 36 ', 36 "formed in a substantially ohmic shape can be double-stacked and substantially integrated, and this can be combined with the guard rail (impact) of the third embodiment. Absorbing structure).
[0036]
The materials, dimensions and shapes of the intermediate spacers 20 and 30 in the second and third embodiments are most appropriate in consideration of the type, speed, weight, and the like of the assumed collision vehicle, and the most appropriate cushioning effect and vehicle guidance. It is a matter of course that the design can be changed appropriately so as to obtain the above, and that a plurality of the respective impact absorbing structures of the first, second, and third embodiments can be used in combination.
[0037]
Further, a resin bar may be further mounted in the energy absorbing pipe or on a U-shaped portion of the intermediate spacer, so that only the resin bar is deformed. Both the character-shaped portion and the resin bar may be configured to be deformed (not shown).
[0038]
Further, each of the shock absorbing structures of the present invention can be mounted between a plurality of columns erected in a row on the ground and a guard fence extended horizontally between the columns, for example, a telephone pole, a signal pole, Structures such as junctions between arterial roads and survey roads, a kind of cylindrical safe chie cone installed at the junctions, anti-collision parts before toll gates on expressways, and partition walls such as parking lots ( (Including those made of concrete) so as to cover the surface thereof, whereby the above-described functions can be obtained.
[0039]
【Example】
A first intermediate spacer (height: 50 mm) 26 formed by bending both ends of an SS400 steel material having a thickness of 4.5 mm and a width of 50 mm into a substantially ohmic shape, and bending both ends of an SS400 steel material having a thickness of 4.5 mm and a width of 50 mm. One second intermediate spacing member (see FIG. 5) 36 in which the first intermediate spacing member 26 is superimposed on the inside of a second intermediate spacing member (height 100 mm) 36 'formed in a substantially ohmic shape. Was placed on a base plate, a load (kg) was applied from above, and the relationship between the load and the deformation length (mm) of the intermediate spacer was measured (static absorption experiment).
[0040]
As shown in FIG. 6, for example, in the case of the first intermediate spacer 26, when a load of 330 kg is applied, the deformation length is 5 mm, and when a load of 710 kg is applied, the deformation length is 40 mm. The first intermediate spacer 26 can be deformed only up to a deformation length of 40 mm.
[0041]
In addition, for example, in the case of the second intermediate spacing member 36, when a load of 500 kg is applied, the deformation length is 20 mm, and when a load of 865 kg is applied, the deformation length is 25 mm. That is, in the second intermediate spacer 36, the collision energy corresponding to a load of up to 1830 kg can be absorbed and dispersed by one piece.
[0042]
In addition, it is a matter of course that the material, thickness, width, mounting quantity, and the like of the intermediate spacer are changed in design so that the most appropriate buffer effect is obtained for the type, speed, weight, and the like of the assumed collision vehicle.
[0043]
【The invention's effect】
As described above, according to the impact absorbing structure of the guardrail of the present invention, since the structure is simple, it can be easily assembled and dismantled at the installation site, and the impact energy can be absorbed and reduced by deformation of the energy absorbing pipe, so that the strut is unlikely to be bent or fall down, Thus, each time the foundation portion is re-excavated, the bent support is removed, and a new support is not required.
[0044]
In addition, when a vehicle with a speed and weight greater than imagined collides, even if the column itself does not have the ability to absorb impact, it can absorb the collision energy by deforming or falling down the column, so that the collision vehicle In addition to reliably preventing departure from the road, safety for occupants can be ensured.
[0045]
Further, each of the shock absorbing structures of the present invention is represented by, for example, a utility pole, a signal pole, a junction between a main road and a measuring road, a collision prevention portion in front of a tollgate on an expressway, a partition wall of a parking lot, and the like. It can be appropriately attached to a structure (including concrete) so as to cover the surface thereof, whereby the above-mentioned respective effects with excellent effectiveness can be obtained.
[Brief description of the drawings]
FIG. 1 (a) is a side view of a shock absorbing structure of the present invention, in which a guard fence is illustrated as a cross section. FIG. 1B is a cross-sectional view of a main part of the shock absorbing structure of FIG.
FIG. 2 is a cross-sectional view of relevant parts schematically showing a state after a collision.
FIG. 3 is a sectional view schematically showing another shock absorbing structure of the present invention.
FIG. 4 is a cross-sectional view of a principal part schematically showing another shock absorbing structure of the present invention.
FIG. 5 is a cross-sectional view of a main part schematically showing another intermediate spacing member constituting the shock absorbing structure of the present invention.
FIG. 6 is a graph showing the results of a static absorption experiment. The horizontal axis is the deformation length (mm) of the intermediate spacer, and the vertical axis is the load (kg) applied to the upper surface of the intermediate spacer.
FIG. 7A is a side view schematically showing a structure of a conventional guard race, and the guard fence is illustrated as a cross section. FIG. 7B is a sectional view of a main part of the shock absorbing structure of FIG. 7A.
[Explanation of symbols]
1 ... conventional guardrail 2 ... pillar 4 ... fence 6 ... intermediate spacing tool 10 ... guardrail (shock absorbing structure)
10 '… Guardrail (shock absorbing structure)
12 ... Support 14 ... Guard fence 16 ... Intermediate spacing tool 16a ... Energy absorption pipe 16b ... Arm member 17 ... First fastening fitting 17 '... Fastening fitting 17a ... Through hole 18 ... Second fastening fitting 18' ... Fastening fitting 18a ... Penetration Hole 19: Through hole 20: Guard rail (shock absorbing structure)
26... Approximately ohmic first intermediate spacer 30...
36 second intermediate spacing member 36 'second intermediate spacing member

Claims (5)

A plurality of pillars standing in a row on the ground, and a guard fence installed horizontally across the pillars with the back side facing the side faces of these pillars, and having a substantially Ω shape. Either an intermediate spacer or a pipe-shaped intermediate spacer having an opening at the top and bottom is arranged, and is attached to each of the columns and guard fences with fasteners. A shock absorbing structure for a guardrail, characterized by absorbing and dispersing impact energy due to a collision. Between a structure standing on the ground and a guard fence attached with its back side facing the front side of these structures, a substantially Ω-shaped intermediate spacer or a pipe-shaped top and bottom opening Either of the intermediate spacers is disposed, and each of the intermediate spacers is attached to the support column and the guard fence with a fastening metal, and the irreversible deformation of the intermediate spacer absorbs and disperses the impact energy due to a vehicle collision. Guardrail shock absorbing structure. The shock absorbing structure for a guardrail according to claim 1, wherein a shock absorbing pipe or a shock absorbing resin is further mounted on the intermediate spacer. The structure standing on the ground is any one selected from a group including a utility pole, a signal pole, a junction of a branching road, a collision prevention unit, and a partition wall such as a parking lot. The shock absorbing structure for a guardrail according to claim 2 or 3. The shock absorbing structure for a guardrail according to any one of claims 1 to 4, wherein the intermediate spacer is formed by stacking a plurality of the substantially Ω-shaped intermediate spacers.

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