JPS607088B2 - Roadway protective fence posts - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a support structure for a protective shelf that is not intended for pedestrians but for moving wheels.

In addition to serving as a guide for driving, a protective shelf for the wheels is required to minimize the impact in the event of a collision or collision with a moving vehicle, and to absorb the impact and protect the driver of the vehicle. The goal is to minimize damage to passengers. When a car comes into contact with a guardrail, which is a protective shelf, it is required that there are no obstacles in the direction parallel to the guardrail, specifically, that there are no obstacles on the road side of the pillar guardrail, and the guardrail protrudes in front of the pillar. The format is considered appropriate. After the original invention of the present invention, the applicant has repeatedly conducted research and experiments on the support for a guard shelf for a car, and the present invention is to further improve the safety of wheel occupants and provide a support with high performance. The present invention aims to absorb collision energy and provide safety, and as a support that is economical and does not impair the urban beauty, the support uses a single-shaped cross section with a large section coefficient, and the support is considered as a single fixed beam, and the top end of the support is In order to achieve uniform strength across the entire length of the column when receiving an impact bending load, we use shaped steel with a constant cross section or The structure is cast without using extruded light alloy materials, and the wall thickness of the front flange on the road side is larger than the wall thickness of the back flange, which brings the neutral surface of the column closer to the road side. In order to increase the amount of plastic deformation (plastic deformation), the side shape of the support column is not straight or simply curved.In order to increase the total length of the neutral plane, the branch is curved in a wave-like manner as a whole, and the surface of the mid-firm (web) is The structure is such that the wall thickness near the flange is increased.

Embodiments will be described in detail below with reference to the drawings. Figure 1 is a side view of the strut of the present invention, Figure 2 is a cross-sectional view taken along the 0-low line in Figure 1, and Figure 3 is a front view of the strut. Side views of the struts of different embodiments "Figure 5 is a plan view taken along the arrow V-V' in Figure 4, and Figure 6 is its front view. The struts up to 1' are made of aluminum alloy. It is a corrosion-resistant alloy casting with a Mg content of approximately 3%, and its cross-sectional shape is approximately a single character.

The support column 11 is fastened to an anchor bolt provided in a base (not shown) using a nut using the setting hole 2. Each section from the upper end to the lower end of the column includes a front flange 3, a back flange 4, and an intermediate wall connecting both flanges (
The web 5 is composed of a web 5, and its cross section becomes larger toward the bottom. As a result, the section modulus Z becomes larger toward the bottom of the column. Since the support is a support that receives loads from the road side, that is, from the same direction, the wall thickness of the front flange 3 is made larger than the wall thickness of the back flange 4, so that the neutral plane is moved toward the road side.
As explained above, when a load is applied to the upper end of the column, it is sufficient to have equal strength from the upper end to the lower end, so from an economical point of view, we tried to reduce the weight as much as possible without using extra materials. 6 is Tofu.

Since it is a joint part for attaching and fixing the rail and is stepped towards the roadway side, the rail 9 is set so as to overhang the roadway from the support as shown by the two-dot chain line. The rails are set on the same machine with the rails protruding from the pillars toward the roadway.In addition, each rail 9 is set with a reinforcing rib 8' and a bolt is inserted using the rail fixing hole 0 provided in each general joint 677. It is fixed with nuts, etc.As shown in Figure 1, the overall shape of the support column as seen from the side is a gentle curve above the height of the intermediate guardrail (in this case, there is only one intermediate guardrail), which is connected to the roadway. On the contrary, the lower part of the rear flange 4 is inverted, and the lower part of the rear flange 4 deeply penetrates into the road side, forming a dogleg-shaped recess 11.
is forming. Therefore, the neutral plane of the column is not only closer to the roadway, but as the side appearance of the column shows, the column as a whole is bent in a waveform, forming a neutral plane that is extremely long in the vertical direction compared to the height of the column. is what happened. However, according to experimental rules, supports often break at the bottom.
And since the strut's constituent material is cast, increasing the wall thickness near the surface flange of the intermediate wall not only showed an improvement in strength more than the increase in material cost, but also caused the strut to displace by 30 degrees due to the load. It was confirmed that it had an extremely remarkable holding force until the final displacement of 300 ribs. Curve 1 in Fig. 7 is a load-displacement curve when the wall thickness near the surface flange of the intermediate wall is increased as shown in Fig. 1, which is an embodiment of the present invention. It is a load-displacement curve in case of thickness. The position of the load is the top rail of the column 1. 5' shown in Figures 1 to 3 is the middle wall (web)
This is an example in which the part below the intermediate guardrail has a large wall thickness. FIGS. 4 to 6 show different embodiments in which two intermediate guardrails are provided, and in this case, the thickness is increased at the surface of the intermediate wall below the lower guardrail position near the flange. The purpose of the protective shelf for car balls is to absorb and alleviate collision energy for the safety of passengers, and to prevent the collided wheels from deviating from the shelf, the column has a high supporting capacity as well as the amount of column displacement on the 300 side. By making only a limited portion of the intermediate wall thicker, it has become possible to significantly improve the supporting force. As explained above, the neutral plane of the strut is closer to the surface flange, so as a result of the transition, the distance between the neutral axis and the surface flange in any cross section of the strut is 4.
・This reduces the chance that each surface of the surface flange will separate and break due to tensile stress.

Also, since the slope of the support is curved toward the roadway when viewed from the side, it corresponds to a block-out type, and a car that comes into contact with it will contact the top rail at a higher position than in the diagonal direction. The chance of climbing over a fence or falling down is drastically reduced. In addition, in this embodiment, a bottom plate 2 is installed integrally with the support as a means of attaching and fixing the support to the ground cover.
It is easy to assemble the set on-site because it is cast and fixed with multiple anchor bolts across the middle wall and S-end. The thickness of the bottom plate is made larger than the thickness of the surface flange 3 so as not to break near the screwed part. From the point of view of ensuring the safety of wheel occupants in the event of a collision, an aluminum alloy containing 3% magnesium is suitable as a casting material, as it has a high impact absorption capacity. ``This is because the displacement of the support column in a collision is greater than iron casting, and the occupant strength is strong. This is because it does not cause shock.Furthermore, it has excellent corrosion resistance, which saves management costs, and during installation work, it is lightweight and easy to transport, which shortens the construction period. It is something that contributes.
In addition, in places where there is a curve in a part of the roadway, we use pillars that have exactly the same dimensions in appearance, but the wall thickness of the middle part near the surface is extra large to achieve the desired purpose. It is also possible to provide braces for guard shelves. Additional Relationships The relationships set forth in Article 31, Item 1 are satisfied.

That is, the original invention (Japanese Patent Publication No. 57-42764 (Patent No. 114)
No. 8141)) is the main part of the structure. It is a big deal. Their purpose is to use them as supports for roadway protection fences to achieve the same purpose.

[Brief explanation of the drawing]

FIG. 1 is a side view of the support column, FIG. 2 is a cross-sectional plan view taken in the direction of the arrows, cut using a rolling trowel in FIG. 3, and FIG. 3 is a front view of the support column. Figure 4 is a side view of two intermediate guardrails; Figure 5 is a cross-sectional view taken along the line V-V in Figure 4;
FIG. 6 is a front view. FIG. 7 is a load-displacement curve. 1... Support column, 3... Surface flange, 4...
Rear flange, 5...Medium (web) 5'... Middle wall thick part, 6...Top rail iron fitting part, 7...Middle guardrail iron fitting part, 7'...Lower guardrail fitting part, 11...Concave part 12...Bottom plate. No. T figure 1 figure 2 figure 3 figure 5 figure 4 figure 6

Claims (1)

[Scope of Claims] 1. A support that is erected on the ground and has an I-shaped horizontal section formed by a pair of front and back flanges and a middle wall, and whose horizontal section increases from the upper half downward. An aluminum plate with a fitting part for attaching the top rail at the upper end, one or more fitting parts for attaching the guide rail in the middle part, and a bottom plate integrally formed at the lower end of the column. For the pillars of road protection rails made of alloy casting,
A support for a roadway protection railing in which the support is bent so that its neutral plane is shaped like a wave, and the wall thickness near the surface flange of the center wall of the support is increased. 2. The shape of the pillar is such that the upper part is gently curved toward the roadway from the height of the fitting part for attaching the lower guardrail, and on the other hand, the lower part is a curve that continues from the top and is reversed, and furthermore, the lower part of the rear flange. 2. A roadway protection column strut according to claim 1, wherein the strut is formed with a dogleg-shaped concave portion projecting toward the roadway, and the neutral plane of the strut as a whole is bent in a wave shape. 3. The roadway protection column strut according to claim 1, wherein the wall thickness of the inner wall of the strut near the surface flange between the vicinity of the lower guardrail attachment fitting part of the strut and the bottom plate is particularly increased. 4. The wall thickness of the back flange of the column is thinner than the surface flange on the road side, and in order to install the column vertically, the bottom plate integrally cast with the column at the lower end of the column is formed thicker than the surface flange. Supports for roadway protection columns as described in Scope 1.