JP2893325B2 - Protective fence for median strip - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a guard fence for a median strip which is designed to increase the strength and height of an existing guardrail in order to cope with an increase in speed of road traffic and an increase in size of a vehicle. .

[0002]

2. Description of the Related Art As a protective fence for a median strip, a structure disclosed in, for example, Japanese Utility Model Publication No. 50-7072 or Japanese Utility Model Publication No. 4-23333 is generally used. That is, as shown in FIG. 17, a common structure for these protective fences is that a steel column 1 is erected at a predetermined interval on a ground 11 of a median strip, and a column bracket is provided above each column 1. 2 is fixed at the intermediate portion by bolts 18. Then, at both ends of each support bracket 2 of the plurality of supports 1, both ends of the guard rails 4 having a plurality of corrugated cross sections provided with the intermediate ridges 3 toward the inner surface are superimposed, and further, the vertical superimposed portion,
The mounting flange 19 formed by bending at both ends of the support bracket 2 is overlapped, and between the guard rails 4 connected in the longitudinal direction using a tension fitting 20 composed of a bolt and a nut that passes through the overlapped portion, and The guard rail 4 and the support bracket 2 are tightly connected to form a protective fence.

[0003]

Due to the recent increase in speed of roads and the size of vehicles, the existing protective fences shown in FIG. 17 have insufficient strength and height, and it is necessary to reinforce them. ing. In this case, it is most desirable to satisfy the above-mentioned demand by reinforcing the existing guardrail from the viewpoint of economy and workability. However, there has been no reinforcing structure that can meet this demand.

An object of the present invention is to provide a protective fence for a median strip which solves the above-mentioned problems.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is directed to a first embodiment which extends in the width direction of a road on an upper part of a support column 1 which is embedded and fixed on a ground 11 of a median strip.
A center separation in which an intermediate portion of the support bracket 2 is fixed and a first guardrail 4 having a wavy cross section and having an intermediate ridge 3 protruding inward is erected and fixed over a distal end portion of the first support bracket 2. In the protective fence for the obi,
A second support bracket 5 is disposed above the first support bracket 2, and first and second support brackets 2, 5 are provided.
Is fixed by using fixing means, and the lower part of the second guardrail 6 having a corrugated cross section is superimposed on the upper part of the first guardrail 4, and this superposed part is fixed with a first tension fitting, and It is characterized in that the second guardrail 6 and the second support bracket 5 are fixed with a second clamp.

Further, according to the present invention, a fixing bolt 10 is inserted into a bolt hole 8 of an engagement fitting 7 abutting on a lower surface of the first column bracket 2 and a bolt hole 9 of the second column bracket 5. The first and second column brackets 2 and 5 are fixed with the fixing bolts 10 and the nuts 12,
A bolt 14 is inserted into a bolt hole formed in a vertical surface and an inclined surface of the overlapping portion of the second guardrails 4 and 6, and a nut 15 is screwed into the bolt 14 to tighten the overlapping portion.
Bolts 14 are inserted into the upright plates 13 at both ends of the second support bracket 5 and the bolt holes in the vertical portions of the second guardrail 6, and nuts 15 are screwed into the bolts 14 to raise the upright plate 13.
And the second guardrail 6 are fastened.

According to the configuration of the present invention, the structure of the existing guard fence, that is, the first support bracket 2 and the structure of the first support bracket 2 and the first guardrail 4 can be changed without changing the structure of the first support bracket 2. By adding the second support bracket 5 and the second guardrail 6 to the first guardrail 4, the strength of the existing protective fence is reinforced,
And the fence height can be increased.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1 to 8 show a first embodiment. In each of the drawings, a plurality of steel columns 1 are erected at predetermined intervals on a ground 11 of a median strip on an automobile road. An intermediate portion of the first support bracket 2 is fixed to the portion by bolts 18, and a second support bracket 5 is disposed above the first support bracket 2, and the first and second support brackets 2, 5 are connected to each other. Are fixed by a first tightening fitting, that is, an engaging fitting 7 disposed below the first support bracket 2, a fixing bolt 10 and a nut 12, and are fixed to both ends of the first and second support brackets 2, 5. The first guardrail 4 and the second guardrail 6 are fixed using a clamp, and the first and second guardrails 4 and 6 are fixed with the clamp, that is, a plurality of bolts 14 and nuts 15. . In the above configuration, the support 1, the first support bracket 2, and the first guardrail 4 constitute an existing protective fence.

The structure of each part will be described in detail. The first support bracket 2 is composed of two U-shaped members 21 each having a U-shaped cross section, each of which is back-to-back and applied to the upper side surface of the support 1, and a bolt penetrating the vertical portion and the support 1. The nut 18 is fixed to the support column 1 by screwing it to the nut 18.

The first guard rail 4 has a corrugated cross-sectional shape provided with an intermediate ridge 3 projecting inward, an upper inclined flange 22 and a lower inclined flange 23. Are established at predetermined intervals. Both ends of the vertical portion of the U-shaped cross section member 21 are slightly recessed from the upper and lower horizontal portions, and the mounting flange 19 is bent at a right angle (horizontal direction) from both ends of the recessed vertical portion. In addition, the ends of the first guardrails 4 that are continuously provided in the longitudinal direction are overlapped with each other,
The vertical portion of the intermediate ridge 3 is applied to the mounting flange 19, a bolt 14 is inserted into a bolt hole 17 formed in each member, and a nut 15 is screwed into the mounting flange 19. The guardrail 4 is fixed. The ends of the first guard rails 4 are also tightly connected by inserting a bolt 14 into a bolt hole 17 formed in the inclined portion of the corrugated cross section, and screwing a nut 15 into this.

The second support bracket 5 has a horizontal upper surface 5a.
An upright plate 13 having a support flange 24 at an upper portion is fixed by welding to both ends in the longitudinal direction of a U-shaped section having vertical and both ends 5b, and is fixed by welding over its inner surface and the horizontal upper surface 5a. A plurality of bolt holes 9 are formed in both sides of both ends of the horizontal upper surface portion 5a and the upright plate 13, respectively.

As shown in an enlarged cross section in FIG. 4, the lower end edge of each of the vertical end portions 5b of the second support bracket 5 abuts on the upper horizontal bent portion 21a of the first support bracket 2, and the engaging metal fitting 7 is mounted on the second support bracket 5. The lower horizontal bent portion 2b is applied to the lower surface of the lower horizontal bent portion 21b, and both end rising portions 7a are connected to the lower horizontal bent portion 2b.
1b, the fixing bolt 10 is inserted into the two bolt holes 8 of the engagement metal fitting 7, and the fixing bolt 10 is inserted into the left and right U-shaped members 21 of the first support bracket 2 in the right and left directions. The first and second support brackets are raised by being raised through the gap 26, inserted into the bolt holes 9 of the horizontal portion 5a of the second support bracket 5, and screwed with the nuts 12 from above the horizontal portion 5a. 2, 5 are firmly connected. In the illustrated example, two fixing bolts 10 are provided at each end of the first and second support brackets 2 and 5, a total of four fixing bolts. It may be changed (described later with reference to FIG. 16).

On the other hand, the second guardrail 6 is substantially similar in cross section to the first guardrail 4 and has an inner ridge 28 having a trapezoidal cross section projecting inward, an upper inclined flange 29 and a lower inclined flange 30. A plurality of bolt holes 32 are formed in each of the inner protrusion 28, the upper inclined flange 29, and the lower inclined flange 30.

Then, as shown in FIG. 2 and FIG.
The corrugated cross sections at both ends of the guardrail 6 are overlapped, the bolt 14 is inserted into a bolt hole 32 formed in the two inclined flanges 29 on the upper side of the inner ridge 28, and the nut 15 is screwed into the bolt. The two guardrails 6 are connected in the longitudinal direction.

Next, the vertical portion of the inner ridge 28 of the second guardrail 6 where the corrugated cross sections at both ends are overlapped with each other
The overlapping portion of the second guardrail 6 is brought into contact with the upright plate 13 of the support bracket 5 by inserting the bolt 14 into a bolt hole 37 a formed in each member and screwing the nut 15 into each bolt. The support bracket 5 can be tightened.

Further, the inner ridge 2 of the second guardrail 6 is provided.
8, the lower inclined flange 30 overlapped on the lower side
After being overlapped with the upper inclined flange 22 of the guardrail 4, the bolt 14 is inserted into a bolt hole formed in each part, and a nut 15 is screwed into the bolt.
Can be firmly fixed to the second guardrail 6.

Next, FIGS. 9 to 15 show a second embodiment of the present invention. This embodiment is different from the first embodiment in the shape of the lower end of the second guardrail 6a. That is, the lower end shape of the second guardrail 6 in the first embodiment is such that the lower inclined flange 30
In the second embodiment, the second
The other point is that the lower vertical flange 31 is continuously provided below the guard rail 6a and the lower inclined flange 30, and the other configuration is the same as that of the first embodiment. Are denoted by the same reference numerals, and redundant description is omitted.)

According to the second embodiment, since the lower vertical flange 31 is formed at the lower end of the lower inclined flange 30, the lower vertical flange 3 is formed as shown in FIG.
1 is supported on the horizontal upper surface of the U-shaped member 21 of the first support bracket 2 and the first guardrail 4
Can be superimposed on the second guardrail 6a and tightened by the bolt 14 and the nut 15, so that the tightening operation can be performed stably. Further, since the second guardrail 6a is provided with the lower vertical flange 31, the strength is improved by the increased vertical dimension of the guardrail as compared with the second guardrail 6 of the first embodiment having no lower vertical flange 31. In addition, since the area of the overlapping portion with the first guardrail 4 is increased, the overlapping portion strength is also improved.

Next, FIG. 16 shows a third embodiment of the present invention, in which the first and second embodiments are different from the first and second embodiments.
3 shows a joint structure of the column brackets 2 and 5; That is, in the first and second embodiments, two bolt holes 8 are provided in both ends of the second support bracket 5 in the longitudinal direction and the two fittings 7, respectively.
9 are provided and a total of four bolts 10 are used to tighten them, whereas in the third embodiment, both ends of the second support bracket 5 in the longitudinal direction and two engagement fittings 7 are provided. Each one
A plurality of bolt holes 8 and 9 are provided, and the two are tightened using a total of two bolts 10. If the strength of the bolt 10 is sufficient, such a tightened structure can be adopted. In the third embodiment, the second guardrail 6
Indicates a guardrail having the same structure as that of the first embodiment.

[0020]

As described above, according to the guard fence for the median strip of the present invention, the existing first support bracket 2 and first guardrail 4 can be replaced with the second support bracket without changing the structure. 5 and second guardrail 6
Can be added simply and firmly. Therefore, the strength of the existing protective fence for the median strip can be easily increased, and the height can be increased, so that there is an effect that it is possible to cope with a high-speed road traffic and a large-sized vehicle.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view of a protective fence for a median strip according to a first embodiment of the present invention.

FIG. 2 is an enlarged view of the upper part of FIG.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is an enlarged view of a portion B in FIG. 2;

FIG. 5 is a perspective view of the protective fence for the median strip of the first embodiment.

FIG. 6 is an exploded perspective view of the protective fence for the median strip of FIG. 5;

FIG. 7 is an inner side view of a single guardrail.

FIG. 8 is a partial cross-sectional perspective view of the guardrail alone.

FIG. 9 is a longitudinal sectional side view of a protective fence for a median strip according to a second embodiment.

FIG. 10 is an enlarged view of the upper part of FIG. 9;

FIG. 11 is a sectional view taken along line CC of FIG. 10;

FIG. 12 is an enlarged view of a portion D in FIG. 10;

FIG. 13 is an exploded perspective view of a protective fence for a median strip of the second embodiment.

FIG. 14 is an inner side view of the guardrail alone.

FIG. 15 is a partial sectional perspective view of the guardrail alone.

FIG. 16 is an explanatory view of a protective fence for a median strip according to a third embodiment of the present invention, which is cut off at the position of line CC in FIG. 10;

FIG. 17 is a side view of a conventional protective fence for a median strip.

[Explanation of symbols]

 Reference Signs List 1 support 2 first support bracket 3 intermediate ridge 4 first guardrail 5 second support bracket 6 second guardrail 6a second guardrail 7 engaging metal fitting 8 bolt hole 9 bolt hole 10 fixing bolt 11 ground 12 nut 13 upright plate 14 bolt REFERENCE SIGNS LIST 15 nut 17 bolt hole 18 bolt 19 mounting flange 20 tensioning member 21 section U-shaped member 22 upper inclined flange 23 lower inclined flange 24 support flange 25 reinforcing plate 26 gap 28 inner protrusion 29 upper inclined flange 30 lower inclined flange 31 lower Vertical flange 32 Bolt hole

Continuing from the front page (73) Patent holder 000101949 Sumitomo Metal Construction Materials Co., Ltd. 2-1-1, Edobori, Nishi-ku, Osaka-shi (72) Inventor Masahiro Yasuda 3-84-4-103 Utajima, Nishiyodogawa-ku, Osaka (72) Inventor Tetsuya Endo 1-26-1 Motohama-cho, Amagasaki-shi, Hyogo (72) Inventor Masashi Kono 5-15-21, Honcho, Funabashi-shi, Chiba (72) Inventor Kiyoshi Takamori 4--21, Asahi-cho, Kashiwa-shi, Chiba Inventor Noriyuki Horikawa 2-9-3-103 Nakazuma, Ageo City, Saitama Prefecture (72) Inventor Satoshi Kaji 3-10-16 Higashimonmae, Kawasaki-ku, Kawasaki City, Kanagawa Prefecture Examiner Yoshiko Arai (58) .Cl. ⁶ , DB name) E01F 15/02 E01F 15/08

Claims (2)

(57) [Claims] 1. An intermediate portion of a first support bracket 2 extending in the width direction of a road is fixed to an upper portion of a support 1 embedded and fixed on a ground 11 of a median strip at an interval, and protrudes inward. A first guardrail 4 having a corrugated cross section provided with an intermediate ridge 3 is provided above the first support bracket 2 in a protective fence for a median strip which is erected and fixed over the distal end of the first support bracket 2. After the second support bracket 5 is provided, the first and second support brackets 2 and 5 are fixed using fixing means, and a second guardrail 6 having a corrugated cross-sectional shape is provided above the first guardrail 4.
The lower part of the center is overlapped, and this overlapped portion is fixed with a first tightening bracket, and the second guardrail 6 and the second support bracket 5 are fixed with a second tightening bracket. Protective fence for obi. 2. A fixing bolt 10 is inserted into a bolt hole 8 of an engagement fitting 7 abutting on a lower surface of the first column bracket 2 and a bolt hole 9 of the second column bracket 5.
The first and second support brackets 2 and 5 are fixed with the fixing bolts 10 and the nuts 12, and bolts 14 are inserted into bolt holes formed in the vertical and inclined surfaces of the overlapping portions of the first and second guard rails 4 and 6. Then, a nut 15 is screwed into the bolt 14 to tighten the overlapping portion, and bolts are inserted into the upright plates 13 at both ends of the second support bracket 5 and the bolt holes in the vertical portion of the second guardrail 6. 14 and this bolt 1
The protective fence for a median strip according to claim 1, wherein the upright plate (13) and the second guardrail (6) are fastened by screwing a nut (15) to the nut (4).