JPH0423933Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention relates to a protective fence installed in a median strip on a motorway.

[Prior art]

Conventionally, as a protective fence for a median strip on an expressway, as disclosed in Japanese Utility Model Application Publication No. 147927/1983, a fence was installed on the top of a pillar embedded and fixed at intervals in the ground of the median strip. The middle part of the support bracket extending in the width direction of the road is fixed, and a guardrail with a corrugated cross section, which has an intermediate protrusion that protrudes toward the back side, is erected and fixed across the tip of each support bracket, and extends in the left and right direction. An upper protruding part and a lower protruding part are provided at the upper and lower parts of both ends of the channel steel, and a mounting flange is integrally provided at the intermediate part of both ends of the channel steel, and an intermediate part spacing material (intermediate bracket) is provided. A structure is known in which an intermediate spacing member is interposed between the left and right guardrails in the middle of adjacent columns, and the mounting flange and the guardrail are connected by bolts.

And in the case of the protective fence for the median strip of this structure,
When the front part of a car traveling at high speed collides with one of the guardrails, the middle part of the pillar 1 is bent and the upper part of the pillar 1 and the middle part spacing member 12 are tilted, as shown by the solid line in FIG. The guardrail 5 on the opposite side to the collision side may touch the ground. Even in such a state, the level of the guardrail 4 on the collision side does not change much from before the collision, so even after the upper part of the support column tilts and the guardrail 5 on the opposite side touches the ground, the ground 13 prevents the guardrail from colliding with the ground 13. By supporting the guardrail 4 on the collision side via the guardrail 5 and the intermediate spacer 12, the protective mechanical function of the guardrail 4 can be exhibited.

However, in the conventional median strip protection fence, since channel steel is used as the intermediate spacer 12, the rigidity of the intermediate spacer 12 is small, so that it does not fall into the inclined state shown in FIG. After winter, the intermediate spacing member 12 located between the pillars of the median strip protection fence is relatively easily buckled and deformed by the collision force of the automobile, so there is a problem that the protection fence function is low. Further, since the upper protrusion and the lower protrusion that are arranged on the upper and lower surfaces of the intermediate protrusion 3 in the guardrails 4 and 5 are integrally provided at both ends of the channel steel constituting the intermediate spacer, The intermediate protrusion 3 of each guardrail must be fitted between the upper and lower protrusions at both ends of the spacer 12, making it difficult to assemble and connect the guardrails 4, 5 and the middle spacer 12. There is a problem.

[Purpose of the invention, structure]

The purpose of this invention is to provide a protective fence for a median strip that can advantageously solve the above-mentioned problem. The middle part of a support bracket 2 extending in the road width direction is fixed to the upper part of the support support 1, which is fixed to the support support 1, and guardrails 4 and 5 each having a corrugated cross section and having an intermediate protrusion 3 projecting toward the back side are attached to each support support bracket. In the median strip protection fence, which is constructed and fixed across the tips of the two, and in which an intermediate spacer member is interposed and fixed between the left and right guardrails 4 and 5 in the middle of the adjacent pillars 1,
A locking protrusion 7 is provided only at the top of both ends of the tubular body 6 extending in the left-right direction, and mounting flanges 8 are integrally provided on both front and rear sides of both ends of the tubular body 6, thereby forming an intermediate spacer. 9 is constructed, and the pipe end surface of the intermediate spacer 9 is connected to the guardrails 4, 5.
The locking protrusion 7 is arranged to face the top plate of the intermediate protrusion 3 in the middle protrusion 3.
The fence is placed on the upper part of the median strip, and the top plate of the intermediate protrusion 3 and the mounting flange 8 are connected by bolts 10.

〔Example〕

Next, this invention will be explained in detail using illustrated examples.

Figures 4 to 7 show an intermediate spacer 9 used in an embodiment of the invention, which has a rectangular closed cross section with a height greater than its width and extends in the left and right direction. A locking protrusion 7 having a lower slope, which is placed on an intermediate protrusion of the guardrail, is integrally connected to the top of both ends of the steel tubular body 6. Attachment flanges 8 having bolt holes 11 are integrally provided on both sides of the intermediate portion, and lower end surfaces at both ends of the tubular body 6 are vertical.

Figures 1 to 3 show a protective fence for a median strip according to an embodiment of this invention using the intermediate spacer 9, in which a large number of steel fences are installed on the ground of a median strip on an automobile road. The columns 1 are embedded and fixed at intervals, and on both the front and rear sides of each column 1,
A steel support bracket 2 having an upper protrusion and a lower protrusion at both ends is arranged so as to extend in the left-right direction (road width direction), each support bracket 2 is fixed to the support support 1 with a bolt, and each support bracket 2 is fixed to the support support 1 with a bolt. guardrail 4 across one end of 2;
are arranged, and a guardrail 5 is arranged across the other end of each support bracket 2.

Each of the guardrails 4 and 5 has an intermediate protrusion 3 with a trapezoidal cross section protruding from the back side, an upper inclined flange 14 and a lower inclined flange 15, and a mounting flange 16 bent and connected to both ends of the support bracket 2. The top plates of the intermediate protrusions 3 in the guardrails 4 and 5 are connected to each other by bolts.

The intermediate spacing member 9 configured as described above is arranged so as to extend in the left-right direction between adjacent columns 1, and the locking protrusions 7 at both ends of the intermediate spacing member 9 are connected to the guardrails 4, 5. is placed on the inclined upper surface of the intermediate protrusion 3, and the intermediate spacer member 9
Mounting flanges 8 and guardrails 4 and 5 on both ends of
The top plate of the intermediate protrusion 3 is connected to the top plate of the intermediate protrusion 3 by a bolt 10 inserted therethrough.

In FIG. 8, the state in which the safety fence according to the embodiment of this invention is in its normal position is shown by chain lines, and due to the collision of a car, the upper and middle space members 9 of the posts 1 in the safety fence are tilted. A solid line indicates a state in which the guardrail 5 on the opposite side to the collision side is in contact with the ground.

[Effect of idea]

According to this invention, the middle part of the support bracket 2 extending in the road width direction is fixed to the upper part of the support support 1 which is embedded and fixed in the ground of the median strip at intervals, and the middle part of the support support bracket 2 is fixed to the upper part of the support support support 1 which is embedded and fixed in the ground of the median strip at intervals. Guardrails 4 and 5 having a corrugated cross section and having stripes 3 are constructed and fixed across the tip of each support bracket 2, and an intermediate spacer between the left and right guardrails 4 and 5 is interposed between adjacent support supports 1. In the fixed median strip protection fence, since the intermediate spacer member 9 having the tubular body 6 with a closed hollow cross section is used, the rigidity of the intermediate member is significantly increased compared to the conventional case. As a result, the upper part of the support column 1 and the intermediate spacer 9 are inclined due to a collision of a car, and even when the guardrail on the opposite side to the collision side is in contact with the ground, the middle part spacer 9 may buckle due to the force of the car's collision. Therefore,
The function of the protective fence is not lost, and since the locking protrusions 7 are provided only at the top of both ends of the tubular body 6, the intermediate spacing member 9 can be inserted between the guardrails 4 and 5 on both sides. When installing, the locking protrusions 7 at both ends of the intermediate spacer 9 are simply placed on the upper surface of the intermediate protrusion 3 of the guardrails 4, 5, and the bolt holes of the guardrails 4, 5 and the mounting flanges 8 The bolt holes 11 of the guardrails 4 and 5 can be automatically matched with each other.
Effects such as being able to easily perform the work of attaching the intermediate spacer member 9 to the holder can be obtained.

[Brief explanation of the drawing]

Figures 1 to 3 show one embodiment of this invention, in which Figure 1 is a perspective view of the median strip protection fence, and Figure 2 is a state in which the intermediate spacing members are attached to the guardrails on both the left and right sides. Vertical front view showing the 3rd
The figure is a sectional view taken along the line A--A in FIG. 2. Figures 4 to 7 show the intermediate spacer used in the embodiment of this invention, in which Figure 4 is a front view, Figure 5 is a plan view, Figure 6 is a side view, and Figure 7 is a side view. The figure is a sectional view taken along the line BB in FIG. 4. FIG. 8 is a vertical sectional front view showing a state in which the protective fence according to the embodiment of this invention is tilted, and FIG. 9 is a vertical sectional front view showing the conventional protective fence in a tilted state. In the figure, 1 is a column, 2 is a column bracket,
3 is an intermediate protrusion, 4 and 5 are guard rails, 6 is a tubular main body, 7 is a locking protrusion, 8 is a mounting flange, 9 is an intermediate spacer, and 10 is a bolt.

Claims (1)

[Scope of utility model registration request] The middle part of a support bracket 2 extending in the road width direction is fixed to the upper part of a support support 1 embedded in the ground of the median strip at intervals, and is provided with an intermediate protrusion 3 projecting toward the back side. Guardrails 4 and 5 having a corrugated cross section are constructed and fixed across the tip of each column bracket 2, and an intermediate spacer member is interposed and fixed between the left and right guardrails 4 and 5 in the middle of adjacent columns 1. In the belt protection fence, a locking protrusion 7 is provided only at the top of both ends of a tubular body 6 extending in the left-right direction, and mounting flanges 8 are integrally provided on both front and rear sides of both ends of the tubular body 6. The intermediate spacing member 9 is configured such that the pipe end surface of the intermediate spacing member 9 faces the top plate of the intermediate protrusion 3 in the guardrails 4 and 5, and the locking protrusion 7 is A protective fence for a median strip, which is placed on the upper part of an intermediate protrusion 3, and the top plate of the intermediate protrusion 3 and the mounting flange 8 are connected by bolts 10.