JP2002227150A - Protective fence end section buffer device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve compressive strength when a vehicle collides from a side and reliably absorb collision energy in a protective fence end section buffer device installed at the end sections of guardrails at a branch section of a superhighway or the like. SOLUTION: Sliding beams 5-8 are slidably locked and arranged at the end sections of two guardrails 3 and 4, and a wing beam 9 is provided at the tip section of the sliding beams. Fillers 10-13 preventing the shrinkage of intervals at a vehicle collision are properly arranged between the end sections of two guardrails 3 and 4 and between the sliding beams 5-8. A plurality of tubular energy absorbing members 14 are arranged in series along the sliding direction of the sliding beams in a void surrounded by the sliding beams 5-8 and the fillers 10-13. Two of sliding poles 15-17 are provided on each of the fillers 10-12, and the lower end sections of the sliding poles 15-17 are held slidably along the sliding direction of the sliding beams respectively by two guide rails 19 fixed to a foundation section.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a protective fence end shock absorber installed at an end of a guardrail at a branch portion of a highway or the like.

[0002]

2. Description of the Related Art At the tip of a protective fence installed at a junction of a highway, a median strip, a safety zone, or the like, a vehicle that has been erroneously driven may collide. And protection of the vehicle.

[0003] The protective fence end buffer device is required to have a function of absorbing the collision energy at the time of a vehicle collision, and various structures have been put to practical use. For example, Japanese Patent Publication No. 60-572
No. 5, JP-B-60-6410, JP-B 4-2
Japanese Patent Publication No. 0041, Japanese Patent Publication No. 7-103539 and Japanese Patent Laid-Open Publication No. Hei 9-189014 disclose a protective fence end buffer device having a structure in which members are slid in a nested manner. These absorb the collision energy by deforming the members while sliding in a nested manner. However, there is a problem that the sliding direction of the members after the vehicle collision cannot be controlled or the structure is complicated. there were.

[0004] As means for solving such a problem, Japanese Patent Application Laid-Open No. 2000-170130 discloses,
As shown in FIG. 6, two rows of guide members 32 are fixedly provided at an end of the road protective fence 31 at intervals, and two rows of sliding beams 33 are slid along the two rows of guide members 32. Movably connected, a sleeve beam 34 is fixedly mounted at the tip of the sliding beam 33,
The two rows of guide members 32 and the two rows of sliding beams 33
The spacing members 35 and 36 are arranged and fixed at predetermined intervals therebetween, and a sliding support 38 is erected on the spacing member 36 provided between the sliding beams 33, and is surrounded by the sliding beam 33 and the spacing member 36. A plurality of cylindrical energy absorbing members 39 are arranged in series in the vacant space along the sliding direction of the sliding beam 33, and the guide rod 4 slidable in the sliding direction of the sliding beam 33.
0 is set to the plurality of cylindrical energy absorbing members 39 and the spacers 3
6, and a guide rail 42 is provided on the ground within the movable range of the sliding column 38, and the lower end of the sliding column 38 is slidable. A protective fence end shock absorber is disclosed.

[0005]

Problems to be Solved by the Invention
When the vehicle collides with the end from the front direction, the cylindrical energy absorbing member 39 slides the guide rod 40 and the spacer 35,
Since it is crushed in a certain direction by 36, the pressure receiving state of energy at the time of collision can be equalized. However, subsequent studies have revealed that when the vehicle collides from the side, there is a problem in the pressure resistance with only the guide rod 40 and one guide rail 42.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a protective fence end shock absorber with improved pressure resistance when a vehicle collides from the side.

[0007]

The protective fence end buffer device of the present invention is as described in (1) to (4) below.

(1) In a protective fence end buffer installed at the ends of two guard rails, sliding beams are slidably engaged with both guard rails, and a sleeve beam is provided at the foremost end of the sliding beams. A space member for preventing the contraction of the space at the time of a vehicle collision is appropriately disposed between the ends of the two guard rails and between the two sliding beams, and a plurality of cylinders are provided in a space surrounded by the sliding beam and the spacing material. Energy absorbing members are arranged in series along the sliding direction of the sliding beam, two sliding struts are provided on each spacing member, and two guides are fixed to the base at the lower end of each sliding strut. A protective fence end buffer device characterized by being held slidably along rails in the sliding direction of a sliding beam.

(2) The protective fence end buffer according to (1), wherein the spacing member is further extendable.

(3) The protective fence end buffer device according to (1) or (2), wherein the connecting portion between the spacing member and the sliding beam has a pin connecting structure.

(4) The method according to (1), wherein the crushing characteristics of the cylindrical energy absorbing member differ depending on the position of the member.
The protective fence end buffer device according to any one of (1) to (3).

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, referring to the illustrated example,
The protection fence end buffer device of the present invention will be described in detail.

FIG. 1 is a plan view (FIG. 1A) and a side view (FIG. 1B) showing an example of a protective fence end buffer device of the present invention.
It is.

In the protective fence end buffer device according to the present invention, the ends of two guardrails are opposed to the traveling direction of the vehicle, such as a branch of the roads 1 and 2 on a highway, a median strip, and a safety zone. Where it is located. In the example shown in FIG. 1, the guard rails 3, 4 are closer to each other at the ends, but the guard fence end buffer device of the present invention can be installed even when the guard rails 3, 4 are parallel.

In the protective fence end cushioning device of the present invention shown in FIG. 1, first, at the distal ends of the guard rails 3, 4, the spacers 13 are fixed by fixed supports 18 so as not to move even when a vehicle collides. Install firmly on the foundation ground. Then, the sliding beams 5 are slidably provided along the guardrails 3, 4.
8 is locked and arranged. FIG. 5 shows an example of a side view (FIG. 5A) and an end view (FIG. 5B) of the sliding beam 8. In this example, the same two-peak beams as the guardrails 3 and 4 are used for the sliding beam 8, and the upper and lower ends of a portion overlapping with the adjacent guardrail or the other adjacent sliding beam behind the guarding beam 8 (guardrail side). A claw member 24 for locking and sliding on the guide rail or the adjacent sliding beam is fixed to the portion. In the event of a vehicle collision, the sliding beams 5 to 8 slide backward along the guard rail or the sliding beam adjacent to the rear using the claw member 24 as a guide. As another mode of the sliding mechanism for the backward sliding, a horizontally long hole is provided at the same height position of the sliding beam and the guard rail, and the sliding beam and the sliding beam and the guard rail are overlapped. It is also possible to connect with bolts and nuts.
Further, in the example shown in FIG. 1, two sliding beams are provided on each side, but this number can be increased or decreased as necessary.

A sleeve beam 9 is provided at the leading end of the sliding beam. A spacing member 1 for preventing contraction of the gap between the sliding beams at the time of a vehicle collision between the two sliding beams 5 to 8.
0 and 11 are appropriately arranged. The spacing members 10 and 11 do not shrink in length, so that the spacing between the sliding beams at the time of collision of the vehicle is prevented from shrinking, and the sliding beams and the guard rail are prevented from being pushed inward.

In the case where the sliding beams on both sides slide in parallel, it is sufficient that the spacing member does not simply contract in length.
A steel pipe, a shaped steel, or the like can be used. However, as shown in FIG. 1, when the distance between the two sliding beams increases as the sliding beams on both sides slide, not only does the length of the spacing member not shrink, but also the elongation increases. It must be flexible. As a specific configuration, various types such as a combination of shaped steel members slidably nested like a spacing member 11 shown in FIG. 4 can be considered. Any structure that can be extended so as not to hinder sliding in a predetermined direction can be used in the present invention. In addition, the angle formed by the sliding beam and the spacing member changes due to the sliding and the resulting increase in the spacing between the sliding beams. Therefore, as shown in FIG. The connection part is a pin connection structure 23
If you do, you can follow this change in angle,
Smooth sliding of the sliding beam can be guaranteed.

The sliding beams 5 to 8 and the spacers 10, 11, 1
A plurality of cylindrical energy absorbing members 14 are arranged in series in the space surrounded by 3 along the sliding direction of the sliding beams 5 to 8. The cylindrical energy absorbing members 14 are connected to each other with bolts and nuts, and the adjacent cylindrical energy absorbing members 14 with the spacers 10, 11, and 13 are also connected to the spacers with bolts and nuts. When the sliding beams 5 to 8 slide during a vehicle collision, the cylindrical energy absorbing member 14 is crushed and deformed by the spacers and other adjacent cylindrical energy absorbing members, and absorbs collision energy by being deformed. Things.

In the illustrated example, the cylindrical energy absorbing member 1
4 is arranged in three rows near the end and in four rows parallel to the side far from the end. This means that the traveling speed of the vehicle differs depending on the type of road such as an urban road or an expressway. Since the collision energy is different, the number of arrays may be appropriately selected and installed according to the installation location of the protective fence end buffer device.

FIG. 2 shows a cross section taken along the line A--A in FIG. 1 (a). As shown in FIG.
The sliding beams 15 and 16 are slidably held along the sliding direction of the sliding beams 5 to 8 by two guide rails 19 having the lower ends fixed to the base. The sliding struts 15, 16 are provided with sliding beams 5-8, sleeve beams 9,
In addition to preventing the protective fence end buffer device from dropping due to the weight of the plurality of cylindrical energy absorbing members 14 or the snow load, the backward sliding direction of the sliding beams 5 to 8 is controlled during a vehicle collision, As the sliding beams 5 to 8 retreat, the tubular energy absorbing member 14 can also be retracted while deforming. In the example shown in FIG. 1, since the distance between the spacers 11 and 13 is large, the weight of the cylindrical energy absorbing member 14 between the spacers 11 and 13 is supported, and the sliding direction To control the sliding beam 7,
The spacing member 12 that is not connected to 8 is arranged, and two sliding columns 17 are also provided on this.

It is not only dangerous to slide the sliding beams 5 to 8 in such a way as to protrude to the road side, but the sliding of the sliding beams 5 to 8 is also dangerous.
The control of the sliding direction is also important in the sense that it is necessary that the 4 be crushed in a certain direction and surely deformed in order to reliably absorb the collision energy. However, the direction of the vehicle collision is not always the same direction,
It is necessary to control the sliding direction by the guide rail 19. In the present invention, as shown in FIG.
Are provided along the sliding direction of the sliding beam to increase the pressure resistance when the vehicle collides from the side. In order to prevent the guide rail 19 itself from moving when a vehicle collides, as shown in FIG. 1B, the guide rail 19 is firmly fixed to the foundation ground by a guide rail support column 20. .

In order to slidably hold the lower ends of the sliding supports 15 and 16 with the guide rail 19, in this example, FIG.
As shown in FIG. 2C, the upper ends of both side plates 22 of the guide rail 19 are projected into the groove, and are engaged with the flanges 21 provided at the lower ends of the sliding columns 15 and 16 as shown in FIG. It was to be. This not only controls the sliding direction of the sliding strut in the horizontal plane, but also prevents the sliding strut from rising when a vehicle with a low center of gravity enters. In this example, the lower end of the sliding support is sandwiched between both side plates on the guide rail side. In addition, a flange protruding laterally is provided on the upper end of the guide rail, and the lower end of the sliding support is provided. Alternatively, a straddle type monorail type in which a claw member engaged with the flange is provided may be employed.

As the cylindrical energy absorbing member 14, a material having elasticity and plasticity, which are not so strong as material characteristics, such as a steel cylinder and a resin cylinder, can be used. A very light collision can be dealt with only in the elastic region, and can be restored and reused after the collision. In the case of a large collision, there is a risk that the vehicle after the collision will be rejected only in the elastic region of strong elasticity, and energy absorption in the plastic region is necessary. It is preferable to provide a difference in the crushing characteristics of the cylindrical energy absorbing member 14 according to the arrangement position. For example, a material that is easily crushed is disposed on the side near the end, and a material that is not easily crushed is disposed as the distance from the end increases. The crushing characteristics of the cylindrical energy absorbing member can be differentiated by changing the thickness, diameter, cross-sectional shape, number of arrangements, and materials of the cylindrical energy absorbing member, or by combining these changes. For example, on the side near the end, increase the diameter, reduce the thickness,
The number of arrangements is reduced, the diameter is gradually reduced as the distance from the end is increased, the plate thickness is increased, and the number of arrangements is increased.

In the example shown in FIG. 1, two sliding beams are arranged in series, and a sleeve beam 9 is fixed to the end of the sliding beams. Only one may be provided, or three or more may be provided in series. Since the collision energy greatly varies under conditions such as a light vehicle to a heavy vehicle, a high speed to a low speed, and the like, it is possible to cope with these different magnitudes of collision energy by appropriately selecting the number arranged in series.

[0025]

In the protective fence end buffer device according to the present invention, the cylindrical energy absorbing member is crushed in a certain direction by the sliding of the sliding beam at the time of a vehicle collision and is deformed to reduce the collision energy. Absorb reliably. Further, by holding the two sliding columns provided on each spacing member slidably on the two guide rails, the pressure resistance when the vehicle collides from the side is increased, and the energy absorbing ability is stabilized. .

[Brief description of the drawings]

FIG. 1 is a plan view (FIG. 1 (a)) and a side view (FIG. 1 (b)) showing an example of a protective fence end buffer device of the present invention.

FIG. 2 is a diagram showing a cross section taken along line AA of FIG.

FIG. 3 is a plan view (FIG. 3 (a)) and a side view (FIG. 3 (b)) showing an example of a guide rail of the protective fence end buffer device of the present invention.
FIG. 3 is a sectional view taken along line BB of FIG.

FIG. 4 is a partially enlarged plan view of an example of the protective fence end buffer device of the present invention.

FIGS. 5A and 5B are a side view (FIG. 5A) and an end view (FIG. 5B) showing an example of a sliding beam.

FIG. 6 is a plan view (FIG. 6A) and a side view (FIG. 6B) showing an example of a conventional protective fence end buffer device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Road 2 Road 3 Guard rail 4 Guard rail 5 Sliding beam 6 Sliding beam 7 Sliding beam 8 Sliding beam 9 Sleeve beam 10 Spacing material 11 Spacing material 12 Spacing material 13 Spacing material 14 Cylindrical energy absorbing member 15 Sliding support 16 Sliding column 17 Sliding column 18 Fixed column 19 Guide rail 20 Guide rail supporting column 21 Flange 22 Side plate 23 Pin connection structure 24 Claw member 31 Road protection fence 32 Guide member 33 Sliding beam 34 Sleeve beam 35 Spacing material 36 Interval Material 37 Fixed column 38 Sliding column 39 Cylindrical energy absorbing member 40 Guide rod 41 Guide rod receiving member 42 Guide rail 44 End cushioning material

 ──────────────────────────────────────────────────続 き Continued on the front page (71) Applicant 000003528 Tokyo Seimitsu Co., Ltd. 2-3-14 Nihonbashi Muromachi, Chuo-ku, Tokyo (71) Applicant 000006839 Nippon Steel Construction Materials Co., Ltd. 2--17 Kiba, Koto-ku, Tokyo No. 12 (71) Applicant 000231110 Nippon Kokan Light Steel Co., Ltd. (72) Inventor Norihiko Kajimura 1-27-22 Hashiya, Hirakata-shi, Osaka (72) Inventor Kiyoshi Takamori 2-3-14 Nihonbashi Muromachi, Chuo-ku, Tokyo Inside Tokyo Seikatsu Co., Ltd. (72) Inventor Satoshi Kaji 3-10-16-301 Higashimonmae, Kawasaki-ku, Kawasaki-shi, Kanagawa Prefecture (72) Noriyuki Horikawa 2-9-3 Nakazuma, Ageo-shi, Saitama F-term (reference) 2D101 CA06 D A04 EA02 FA22 GA15 GA17 GA18 3J066 AA01 AA23 BA03 BB01 BC01 BD05 BD10 BF02

Claims (4)

[Claims] In a guard fence end buffer device installed at an end of two guard rails, a sliding beam is slidably engaged with both guard rails, and a sleeve beam is provided at the foremost end of the sliding beam. A spacing member is provided between the ends of the two guardrails and between the sliding beams to prevent contraction of the spacing in the event of a vehicle collision, and a plurality of cylindrical members are formed in a space surrounded by the sliding beams and the spacing member. Two guide rails in which energy absorbing members are arranged in series along the sliding direction of the sliding beam, two sliding struts are provided on each spacing member, and the lower end of each sliding strut is fixed to the base. Wherein the end of the protective fence is held slidably along the sliding direction of the sliding beam. 2. The protective fence end buffer according to claim 1, wherein the spacer is further extendable. 3. The protective fence end buffer device according to claim 1, wherein a connecting portion between the spacing member and the sliding beam has a pin connecting structure. 4. The protective fence end shock absorber according to claim 1, wherein a difference is made in the crushing characteristics of the tubular energy absorbing member according to the position of the tubular energy absorbing member.