JPH052653Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a collision absorbing device for a guard fence that is connected to the terminal of the guard fence.

(Prior art) Guardrails,
Protective fences such as guard cables and rigid protective fences (concrete blocks) are provided. Conventionally, the collision absorbing device 21 at the end of these protective fences was
As shown in FIG. 7, assuming the case of a head-on collision, old tires are placed in front of the terminal 23 on the vehicle-facing side of the protective fence 22 according to the speed and weight of the vehicle 24.
Shock absorbing materials 25 such as drums, lightweight concrete, and rubber cushions were installed.

The installed shock absorber 25 is intended to absorb the shock caused by a collision of the vehicle 24 or the like.

(Problem to be solved by the invention) However, the shock absorber 25 such as an old tire or a drum used in such a conventional collision absorber 21 is not provided to absorb the shock at the time of a collision. The lower part was almost unfixed. Therefore, when the vehicle 24 collides, these shock absorbing materials 25 such as old tires and drums are scattered, and a following vehicle collides with them, or a secondary disaster occurs such as running over them and overturning. There was a risk of triggering. Furthermore, when the collision absorbing material 25 is fixed, there is a problem in that a strong impact is applied to the colliding vehicle, and furthermore, the collision absorbing material 25 sinks into the vehicle 24.

This invention solves the above conventional problems,
A beam is installed at the end of the protective fence facing in the direction that absorbs the impact, and the depth of the embedding of the pillar attached to the beam becomes shallower in the direction that absorbs the impact from the end, thereby preventing a vehicle from colliding with the fence. To provide a device that absorbs impact and prevents collision-absorbing material from scattering when columns collapse one after another.

(Means for Solving the Problems) As a means for solving the above problems, the present invention includes extending a beam made of plate material facing the direction of absorbing impact at the end of the protective fence, and A plurality of pillars are attached, and the depth of the pillars is set to be deep on the terminal side of the protective fence and become shallower toward the tip of the beam.

(Function) With this configuration, the struts attached to the beams are embedded so that they become shallower toward the collision absorbing direction from the end of the guardrail, so in the event of a vehicle collision, , the pillars fall down one after another and absorb the energy of the collision, and the beams attached to the pillars do not bend and scatter along with the fallen pillars.

(Example) Next, an example of the present invention will be described based on FIGS. 1 to 5. Note that in this embodiment, a guardrail is used as a protective fence. 1 is a collision absorbing device for the terminal of a protective fence. The collision absorbing device 1 for the end of a guardrail is provided with a beam 3 made of a plate material and oriented in the direction of absorbing collisions at the end 2a of the guardrail 2.
The pillar 4 attached to the beam 3 is buried to a depth 5 in the ground such that it is deep on the end 2a side of the guardrail 2 and becomes shallower toward the tip 3a of the beam 3.

(See Fig. 1) The beam 3 is made of a plate material having a plurality of U-shaped bodies 6 as shown in Figs. In other words, they are connected by bolts 7 in a direction facing the direction of vehicle movement. The struts 4 are attached to the beam 3 by a plurality of bolts 7 at appropriate intervals.

The depth of embedding in the ground 5 varies depending on conditions such as the length m of the beam 3 of the collision absorbing device 1, the number n of the columns 4, the collision speed VKm/h, and the weight Wt of the colliding object. However, in this example, considering the safety of the occupants, the average deceleration at the time of collision is set to 4.g.
Set the collision speed V to be 100km/
h, vehicle weight W is 1.5t, length of beam 2 is
As a result of carrying out the experiment with a length of 9.7 m and the number n of pillars 4 being 20, the following embedding depth 5 was obtained. In other words, as shown in Figure 1, the embedding depth 5 at ~ of pillar 4 is 0.4 m, the embedding depth 5 at ~ of pillar 4 is 0.5 m, and the embedding depth 5 at ~ of pillar 4.
is 0.6m, and the depth of embedding 5 for pillar 4 is 0.8m.
The embedding depth 5 for the pillar 4 is 1.65m, which is the embedding depth 5 for the regular guardrail 2 pillar 4.
became the same.

In addition, the beam 3 used has a vertical width of 750 mm and a thickness of 3.2 mm, and the diameter of the column 4 is 114.3 m/m.

This device configured in this manner is connected to a guardrail 2 installed at a branch of a road 8. (Refer to Fig. 4) When the vehicle 9 due to an incorrect driving operation collides with the collision absorbing device 1, the vehicle 9 crashes into the collision absorbing device 1.
The robot advances by uprooting the pillars 4 one after another, gradually losing its kinetic energy, and eventually only tilting the pillars 4 before it stops. At this time,
Since the beam 3 to which the strut 4 is attached is connected to the strut 4 by the bolt 7, it absorbs the impact force of the vehicle while bending together with the strut 4. (Refer to Figure 5) (Effect of the invention) As explained above, the present invention extends the beam at the end of the protective fence in the direction of absorbing shock, and embeds the support pillar attached to the beam to the depth. This is because it is embedded so that it becomes shallower toward the direction of absorbing shock from the end of the protective fence.
When a vehicle collides with the beam, it collapses from the shallowly embedded pillars, allowing the energy from the vehicle collision to be absorbed. Furthermore, since the beam is connected to the support column with bolts, it will not bend along with the fallen support column and be scattered around. Therefore, there is no danger to the following vehicles, and a secondary disaster can be prevented.

Further, since the beam has a U-shape and has a curved convex surface directed in a direction that absorbs the impact of vehicles, etc., the impact received by the colliding vehicle can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a side view showing one embodiment of the collision absorbing device for the end of a protective fence according to the present invention, FIG. 2 is a plan view according to FIG. 1, and FIG. FIG. 4 is a plan view showing a collision absorbing device for the end of a protective fence installed at a road branch, and FIG. Side view showing the collision area, No. 6
This figure is a plan view showing a conventional collision absorbing device installed at a road branch, and FIG. 7 is a plan view showing a place where a vehicle has collided with the device according to FIG. 6. DESCRIPTION OF SYMBOLS 1... Collision absorption device for the terminal of a protective fence, 2... Protective fence (guardrail), 2a... Terminal, 3... Beam, 3a... Tip, 4... Support column, 5... Depth of embedding, 6... ...U-shaped body, 6a...curved convex surface.

Claims (1)

[Claims for Utility Model Registration] (1) A beam made of plate material is extended at the end of the protective fence in a direction that absorbs shock, a plurality of columns are attached to the beam, and the depth of embedding of the columns is adjusted. . A collision absorbing device for a protective fence terminal, characterized in that it is provided so as to be deep on the terminal side of the protective fence and become shallower toward the tip of the beam. (2) In the collision absorbing device for a guard fence terminal according to claim 1 of the utility model registration claim, the beam is composed of a plurality of U-shaped bodies, and the U-shaped bodies are arranged in series with their curved convex surfaces facing toward the tips. something that is characterized by