JPH04176905A - Protective fence for roadway - Google Patents

Abstract

PURPOSE:To enhance the protective performance by providing front and rear brackets projectedly at the road side of each column along the road, mounting the front and rear beams at the front and rear sides, respectively, and providing the front beam leaving a recessed displacement distance between the front and rear beams. CONSTITUTION:A rear bracket 2a is provided projectedly at the road side of each column 1 erected on a road at an interval, and rear beams 3a are mounted at its front part, to form a protective fence for heavy-duty vehicle. Also a front bracket 2b is provided projectedly at the road side of each column 1, a front beam 3b is mounted at its front part, and a recessed displacement distance of L is left between the rear beam 3a and the front beam 3b, to form a protective fence for light-duty vehicle. Then multiple bolts and nuts 5A are provided at the upper road side of each column 1, pins 6a are provided at the front of each bracket 2a, and the rear beams 3a of multiple cables are provided to form the heavy-duty protective fence. Thus shock absorbing supporting and safety can be increased.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention is a system installed along the side of a road such as an expressway or along a median strip, and absorbs the impact of two collisions by deforming a beam etc. when a vehicle collides. The present invention relates to a flexible roadway protection fence that reduces the impact force of a collision.

(Prior art) The roadway protection fence described above includes guardrails, guard cables,
It is roughly divided into flexible protection fences such as guard pipes, and rigid protection fences such as concrete walls. It has excellent ability to prevent fences from running off the road with little deformation, and is applied to elevated roads, overpasses, bridges, etc. where there is a risk of serious damage to people, facilities, etc. off the road. The damage to the vehicle is significant, especially in the case of a passenger car, and there is a problem with damage to the vehicle and safety of the occupants.

On the other hand, flexible protective packaging has the function of absorbing impact energy and mitigating the impact force by deforming the beam etc. in the event of a vehicle collision, and its cushioning support reduces damage to the colliding vehicle and allows it to be guided smoothly to the road surface. At the same time, the safety of the passengers is improved, and the installation cost is relatively low, which is why it is widely applied on expressways, etc. 4 (Problem to be solved by the invention) The above-mentioned conventional flexible protective fence , has advantages such as reducing damage to the vehicle, smooth guidance of the vehicle, and safety of passengers due to its shock-absorbing performance. Setting the shock absorbing force to suit all types of lightweight vehicles is actually an over-the-top device, and excess or deficiency of the shock absorbing force can cause damage to the vehicle and reduce the safety of the occupants. In the case of heavy salt, there are problems such as increased damage to the protective fence and reduced guidance and performance in preventing departure from the road.

It is also conceivable to install a light vehicle protection fence with a buffer support capacity suitable for light vehicles at intervals on the road side of a heavy vehicle protection fence with a buffer support capacity corresponding to heavy salt. In the event of a collision with salt, the protective fence for a light vehicle becomes an obstacle, reducing the shock absorbing performance such as guiding performance to the road surface, resulting in high costs.

The present invention was developed in order to deal with the above-mentioned problem, and its purpose is to provide a protective fence for heavy vehicles that has an M-plane supporting capacity that is not set in accordance with heavy salt. By effectively combining this with a protective fence for lightweight vehicles that has a cushioning support capacity set to correspond to lightweight vehicles, we provide a protective fence for roadways that has improved protection performance and reliability against heavy salt as well as lightweight vehicles. It is in.

(Means for Solving the Problems) The present invention provides rear brackets protruding from the road side of each pillar installed at intervals along the road, and A protective fence for heavy vehicles that has a shock absorbing capacity suitable for buses, etc. is constructed by installing beams, and a front bracket is installed protruding from the road side of each of the pillars, and a front beam is attached to the front of each front bracket. By installing a light vehicle protection fence with a recessed displacement interval on the front side of the rear beam and having a cushioning support capacity suitable for passenger cars, etc., the front light vehicle protection fence can be improved. This eliminates the need for a support column mechanism and eliminates the hindrance caused by the protective fence for light vehicles in the event of a collision with heavy salt, improving protection performance and reliability for heavy salt and light vehicles.

(Function) The protective fence for light vehicles has a shock absorbing capacity suitable for passenger cars, etc., and is constructed with concave displacement intervals on the front side of the rear beam of the protective fence for heavy vehicles. At times, the bridge is effectively buffered and stopped, smoothly guided to the road surface, and restored, reducing damage to the vehicle and increasing safety for passengers.

In addition, the anti-ill for heavy vehicles has a buffer support capacity corresponding to buses, etc., and is installed at the rear side of the protective fence for light vehicles with the above-mentioned concave displacement interval, so that the heavy salt of the bus etc. After being buffered by the light vehicle protection fence, the bridge is effectively buffered by the heavy vehicle protection fence, and is smoothly guided to the road surface and restored, and the prevention of the above guidance is prevented by reducing the number of light vehicle protection columns. Instead, the front beam is greatly depressed and displaced by the heavy salt and functions as a guiding member to the road surface, reducing damage to the vehicle and increasing safety for the occupants.

(Embodiment) An embodiment of the present invention is shown in FIGS. 1 to 3, where 1 is a column, Za is a rear bracket, 3a is a rear beam, 2b is a front bracket, and 3b is a front beam, The bus is constructed by installing rear brackets 2a protruding from the road side of each pillar 1 that is erected at intervals along the road, and attaching a rear beam 3a to the front part of each rear bracket 2a. Protective fence for lightweight vehicles with buffer support capacity corresponding to
A front bracket 2b is installed protruding from the road side, a front beam 3b is attached to the front part of each front bracket 2b, and the rear beam 3a is constructed with a concave displacement interval in front of the rear beam 3a to correspond to a passenger car, etc. It is a protection fence for roadways that is combined with a protection fence for lightweight vehicles that has a buffering support capacity.

More specifically, the heavy vehicle protection fence consists of pillars 1 built at appropriate intervals, and rear brackets that are attached to the upper road R side of each pillar 1 with a plurality of bolts and nuts 5a and protrude. 2a, and a pin etc. 6 on the front side of each rear bracket 2a.
Preferably, the rear beam 3a is made up of seven cables and has an average installation height ha of 75 cm, which is suitable for heavy loads such as buses, etc. (14t), protection reinforcement degree 4 to 7t, maximum dent deformation amount in case of heavy vehicle collision l
It is configured to have an optimal buffering and supporting force with a of about 60 cl. The protective fence for light vehicles includes a front bracket 2b that also serves as the pillar 1 and is attached to the road side with a plurality of bolts and nuts 5a and protrudes, and a bolt and nut 6b on the front side of each front bracket 2b. Recessed displacement interval L'f on the front side of the installed rear beam 3a: constituted by the front beam 3b of the installed rail, more preferably, the average installation height hb of the front beam 3b is 50 cl,
Anti-8 M8 strength 1 to 2.5 tons suitable for light vehicles such as passenger cars (1,2 tons), maximum dent deformation in the event of a lightweight vehicle collision [b = 4
The dent displacement interval is approximately 0cl, and the dent displacement interval is the maximum dent deformation amount [b
+α= set to about 50cl! It is configured to have a supporting force of 1 for jL.

A passenger car with a weight of 1.21 is at a speed of 80 l/h and an approach angle of 2.
As a result of the collision experiment at 0 degrees, as shown in Fig. 2 (A), the deformation of the front beam 3a, front bracket 28, etc. caused the dent displacement to reach almost the maximum of 4001 degrees, and there was little damage from the collision type, and the vehicle was able to smoothly reach the road surface. The aircraft was guided back to normal, and the safety of the occupants was ensured.

In addition, as a result of a collision experiment with a bus weighing 14 tons at a speed of 80 n/h and an approach angle of 20 degrees, the front beam 3b and the front bracket 2b were greatly dented and deformed, as shown in Figure 2 (B). The side beam 3a, rear bracket 2a, etc. were deformed to a maximum of about 60 cl, and there was little collision-type damage, and the vehicle was smoothly guided to the road surface and restored to its normal orientation, ensuring the safety of the occupants. In addition, in the case of the above-mentioned bus collision, the pillars of the heavy vehicle protective fence were replaced by pillars 1 of the light vehicle protective fence.
Since it is also used and is not necessary, there is no obstruction from pillars.
The front beam 3a of the light vehicle protection fence cushions and supports the collision type and guides it smoothly, thereby effectively improving the cushioning support and guidance performance of the heavy vehicle protection fence.

Figure 3 shows the cushioning support performance, where Wa is the curve of the load applied to the guard fence during a collision with a heavy vehicle such as a bus, wb is the curve of the load applied to the guard fence during the collision of a light vehicle such as a passenger car,
Ca is the buffer support characteristic line for the bus (14t), cb is the buffer support characteristic line for the passenger car (1, 21),
Conventionally, the strength P of the protective fence was 2 to 3 tons, but in the present invention, the strength Pa of the protective fence for heavy vehicles is 4 to 7 tons.
The protective fence strength Pa of the protective fence for lightweight vehicles is set to 1 to 2.51, and each M-plane supporting force is set to an optimum value. Also,
It has the advantage of being easy and quick to construct as it can be used as a support, and can be provided at low cost, and the installation width is within the permissible range of about 1.11 mm even though it is installed in two stages, front and rear.

In the embodiment described above, the guard cable is used as the protective fence for heavy vehicles, and the guard rail is used as the protective fence for light vehicles, but they can be rearranged into guard cables, card rails, guard pipes, etc. as needed.

(Effects of the Invention) The present invention has the above-mentioned structure, and the protective fence for lightweight vehicles is configured to have a relatively low same strength shock absorbing force corresponding to light vehicles such as passenger cars. The shock-absorbing support, guidance performance, reliability, and safety of vehicles have been improved. In addition, heavy vehicles such as buses can be effectively buffer-supported by the heavy-vehicle protective fence after being buffer-supported by the light-weight vehicle protective fence. Being done,
It has improved cushioning support, guidance performance, reliability, and safety, and since it can also be used as a support, construction is easy and quick, and it can be provided at low cost, resulting in significantly improved protection performance and reliability.

[Brief explanation of drawings]

Fig. 1 (80BHC) is a front view, top view, and side view showing one embodiment of the present invention, and Fig. 2 (A) and (B) are dent deformation states during a collision between a passenger car and a bus. The plan view mechanism diagram and FIG. 3 are characteristic diagrams of buffer support performance.

Claims (1)

[Claims] Rear brackets are installed protruding from the road side of each pillar that is erected at intervals along the road, and a rear beam is attached to the front of each rear bracket to accommodate buses, etc. A protective fence for heavy vehicles that has a buffering support capacity of 100%, a front bracket is provided protruding from the road side of each of the pillars, a front beam is attached to the front part of each front bracket, and the rear beam is recessed in front. A protective fence for roadways that is installed with a protective fence for lightweight vehicles that is constructed at intervals and has a cushioning support capacity suitable for passenger cars, etc.