JP7306644B2 - protective fence - Google Patents

Description

Application of Article 30, Paragraph 2 of the Patent Law 1. Construction date: April 22, 2020 Construction location: Tomei Expressway between Oi Matsuda IC and Gotemba IC (down line) Contractor: Central Nippon Expressway Co., Ltd. and Maruji Concrete Industry Co., Ltd. Construction date: August 25, 2020 Construction location: Between Tonami C and Kosugi IC on the Hokuriku Expressway (inbound line) Contractor: Central Nippon Expressway Co., Ltd. and Maruji Concrete Industry Co., Ltd. 3. Construction date: December 4, 2020 Construction location: Tomei Expressway between Shimizu IC and Fuji IC (down line) Contractor: Central Nippon Expressway Co., Ltd. and Maruji Concrete Industry Co., Ltd. 4. Publication name: Product description pamphlet Publisher name: Central Nippon Expressway Co., Ltd. and Maruji Concrete Industry Co., Ltd.

The present invention relates to guard fences.

There are cases in which a temporary boundary must be formed on the road surface, such as when a temporary boundary is formed between a roadway and a construction area during road construction or the like. In such a case, generally, a boundary may be laid simply by installing adjacently a protective fence that can function as a protective fence in advance.

For example, the right holders have proposed that a coupler having a fixing part for mounting fixed to a protective fence and a hook part formed in a hook shape on the other end side of the fixing part for mounting provides a concrete protective fence provided in (Patent Document 1).

According to this concrete protective fence, a concrete protective fence having a connector is installed on the road surface where the boundary is to be constructed, and the concrete protective fence to be placed adjacent to the installed concrete protective fence is moved by a crane. While checking the position, move it so that it is adjacent to the installed concrete protective fence, and lower the suspended concrete protective fence as it is, the hook of the connector automatically They are connected while being corrected to positions that fit each other. Thus, such concrete guardrails can be very easily and quickly connected with connectors to form boundaries.

However, such a concrete protective fence must be fitted by lowering the suspended concrete protective fence, or if the road surface on which it is to be installed has a slope, the concrete protective fence must be installed along the slope. It is preferable that there is a certain amount of gap between the connected couplers. However, if there is a gap between the connecting parts, there is a possibility that the concrete protective fence will be rotationally displaced by the gap provided between the connecting parts when a large force is applied from the side, such as when a vehicle collides. there were. When such a rotational displacement occurs, the end face of one concrete guard fence is shifted at the boundary with the adjacent concrete guard fence, and the end face of one of the concrete guard fences protrudes from the side of the concrete guard fence. When a vehicle collides with this protruding end face, there is a possibility that the impact will be very large.

JP 2020-84484 A

Therefore, the present invention has been made to solve this problem. To provide a protective fence capable of reducing the impact given to a vehicle by an end face of a protective fence.

The present invention employs the following means to achieve the above objects.

The protective fence according to the present invention is
a protective fence having a side surface and an end surface made of concrete and having a chamfered portion between the side surface and the end surface;
a connector provided on the end surface of the protective fence;
with
The connector has a hook portion formed in a hook shape, and by sliding the hook portion of a similar connector to be connected in the vertical direction, it is possible to fit so that a gap is provided,
A gap between the connecting members is formed so that the end face of the adjacent protective fence exposed when rotationally displaced by collision is within 120% of the horizontal direction of the chamfered portion.

In the protective fence according to the present invention, the protective fence part may be rotationally displaced when a vehicle or the like collides. Due to this rotational displacement, the end face of the protective fence is exposed from the side surface of the adjacent protective fence. At this time, the portion exposed by the displacement is regulated by the gap between the couplers so that the displacement in the horizontal direction due to the displacement is within 120%. Therefore, even if the vehicle collides with the side surface and moves along the side surface, the impact can be reduced by moving along the chamfered portion without colliding with the end face of the protective fence portion.

Further, in the protective fence according to the present invention, the amount of rotational displacement of the protective fence may be within the range of the chamfered portion.

By adopting such a configuration, it is possible to reliably prevent the vehicle from colliding with the end face of the protective fence, so that it is possible to further reduce the impact of the collision of the vehicle.

Furthermore, in the protective fence according to the present invention, the chamfered portion of the protective fence has a ratio of the length of the end surface to the length of the front surface of 1:n (n is 1.0 or more). can be anything.

By adopting such a configuration, the angle at which the vehicle collides with the chamfered portion becomes smaller, so that the impact of the collision of the vehicle can be further reduced.

Furthermore, in the protection fence according to the present invention, the upper end of the connector may be provided so as to be 35 cm or less from the road surface.

Florida type and single slope type protective fences are thicker on the lower side and narrower on the upper side. However, since it can be arranged in a thick part by attaching it so that it is 35 cm or less from the road surface, the attachment strength of the connector can be kept high. Furthermore, since the displacement between the blocks caused by crossing the ground or changing the slope of the longitudinal section is smaller in the lower direction, the clearance between the connectors can be reduced. Also, in the case of a collision at a low position of the protective fence, the protective fence undergoes rotational motion, but can withstand a higher impact against the load at the time of collision.

Furthermore, in the protective fence according to the present invention, the chamfered portion of the protective fence portion is formed at a position higher than the center of the connector in the height direction, and the area of the chamfered portion increases as it goes upward. It may be characterized by

By adopting such a configuration, the larger the projecting portion (the portion exposed from the side surface) is, the larger the chamfered portion is formed, so that the impact of the vehicle or the like can be efficiently reduced.

FIG. 1 is a perspective view of a protective fence 100 having connectors 20 according to an embodiment. FIG. 2 is a perspective view of the top side of the coupler 20 according to the embodiment. FIG. 3 is a perspective view of the bottom side of the coupler 20 according to the embodiment. FIG. 4 is a top view showing a connected state of the connector 20 according to the embodiment. FIG. 5 is a perspective view showing another embodiment of the coupler 20 according to the embodiment. FIG. 6 is a schematic diagram showing a state of rotational displacement when a vehicle collides with the protection fence 100 according to the embodiment. FIG. 7 is a schematic diagram showing a state of rotational displacement when a vehicle collides with the single slope type 101 and straight wall type 102 type guard fence 100 according to the embodiment. FIG. 8 is a perspective view showing a method of connecting protective fences 100 according to the embodiment. FIG. 9 is a perspective view showing a state in which the protection fences 100 according to the embodiment are connected.

A protective fence 100 according to an embodiment of the present invention will be described in detail below with reference to the drawings. The embodiments and drawings described below illustrate a part of the embodiments of the present invention, and are not used for the purpose of limiting to these configurations. can be changed. FIG. 1 is a perspective view of a protective fence 100 according to an embodiment. FIG. 2 is a diagram showing the connector 20 of the protective fence 100 according to the embodiment.

A protection fence 100 according to the present invention includes a protection fence part 10 mainly made of concrete and a connector 20 provided on at least one end surface 11 of the protection fence part 10 .

The protective fence part 10 is basically formed into a wall surface made of concrete in order to secure weight for functioning as a protective fence. not a thing In this embodiment, a Florida-type protective fence is used, which is made of so-called precast concrete and is thick on the base bottom side and thin on the upper side. Of course, the form of the protective fence part 10 is not particularly limited, and may be, for example, a single slope type, a straight wall type, or other irregular types.

Moreover, the protection fence part 10 concerning this embodiment has the connector 20 attached to the end surface 11, as shown in FIG. The vertical center or the vicinity of the vertical center of the end face 11 is formed so as to protrude from the upper end or the lower end. By adopting such a configuration, when connecting to the adjacent protective fence 100, when lowered from above, the possibility that the upper side or lower side of the end surface 11 of the protective fence part 10 collides and breaks is reduced. can be done. In addition, when fitting the protective fence 10 while lowering it, it is possible to easily confirm the position of each connector 20 .

A groove 12 into which a positioning plate portion 27 of a connector 20 (to be described later) is inserted is formed in the end face 11 of the protection fence portion 10 . The groove 12 is formed wider than the positioning plate portion 27, and is formed so that the width becomes narrower toward the bottom. Therefore, it is easy to insert the positioning plate portion 27 into the groove 12, and after being inserted, the position of the connector 20 is corrected as it is moved downward along the groove 12, and the position of the other connector is automatically adjusted. 20 is corrected to fit, making it easier to connect.

As shown in FIG. 1, the connectors 20 are provided on one or both end surfaces 11 of the protective fence 10 that constitutes the boundary. Can be placed in a concatenated fashion to form a long boundary.

As shown in FIG. 1, the connector 20 is formed to protrude from the end surface 11 of the protective fence 10, and as shown in FIG. have. The hook portion 21 is formed in a hook shape that is folded back so as to have a J shape when viewed from above. An upper slide slope 24 tapered from the upper end 22 of the hook portion 21 to the inner side surface 23 is provided. Similarly, on the side of the lower end 25 of the hook portion 21, as shown in FIG. When the protective fences 100 arranged adjacent to each other are lowered from above, the upper slide slopes 24 and the lower slide slopes 26 slide on the slopes even if the couplers 20 are slightly displaced from each other. You can correct the position by It should be noted that it is not always necessary to provide both of the upper end side slide slope 24 and the lower end side slide slope 26, and either one of them may be provided. Further, it is preferable that the upper slide slope 24 and the lower slide slope 26 have the same angle. By providing them at the same angle, when the guard fences 100 arranged adjacent to each other are lowered from above, it becomes easier for them to come into contact with each other, and damage to the couplers 20 can be reduced. Also, the hooks 21 are provided with a gap 29 when they are fitted together, as shown in FIG. formed to be This gap 29 is not particularly limited, but the adjacent guard fences 100 have a gradient of 3% or more or an angle of 2° or more with respect to the direction along the road (longitudinal direction). It is preferable to provide a gap that allows the cable to be laid. With respect to the transverse direction, as shown in FIG. 6, the gap is such that the rotational displacement is maximized in the range having a length within 120% of the horizontal length α of the chamfer 15 (the shaded range). is provided.

Further, a positioning plate portion 27 extending like a vertical plate may be provided on the end face side of the hook portion 21 . The positioning plate portion 27 is attached perpendicularly to the hook portion 21 . As shown in FIGS. 1 and 4, the positioning plate portion 27 is fitted into the groove 12 formed on the protective fence portion 10 side. In order to facilitate fitting at this time, the positioning plate portion 27 is rounded so that the corners thereof are curved as shown in FIG.

The connector 20 is attached to the end surface 11 of the protective fence 10 . As for the mounting method, for example, as shown in FIG. 5, a mounting hole 28 may be provided in the connector 20 so that it can be directly mounted to the end surface 11 of the protective fence 100 from the outside using bolts or the like. However, when the protective fence part 10 is manufactured, a part of the connector 20 may be embedded in the protective fence 100 and molded integrally. In short, there is no particular limitation as long as it can be attached to the protective fence 100 with enough strength to prevent it from coming off.

The connector 20 manufactured in this manner is provided so as to be positioned below half the height of the protective fence 10 . This is because if it is provided higher than this, the torsional moment increases when a vehicle or the like collides, and it is necessary to increase the strength of the connector 20 . Preferably, the upper end 22 of the connector 20 should be provided at a height of 35 cm or less from the road surface. By providing such a position, in the protective fence 100 called Florida type or single slope type, the width of the lower side becomes thicker and the width of the upper side becomes narrower, so the connector is arranged upward. Then, although it will be arranged in a thin part, it can be arranged in a thick part by attaching it so that it is 35 cm or less from the road surface, so that the mounting strength of the connector 20 can be kept high. can. Furthermore, since the displacement between the blocks caused by crossing the ground or changing the slope of the longitudinal section is smaller in the lower direction, the clearance between the connectors can be reduced. Experiments have also shown that when the protective fence 100 collides with a lower position, the protective fence 100 rotates, but can withstand a higher impact than the load at the time of collision.

Furthermore, the protection fence part 10 is provided with a chamfered part 15 at the corner between the end face 11 and the side face 13 . In the chamfered portion 15, since the protective fences 100 according to the present invention are connected to each other by the connectors 20, there is a gap between the end surface 11 of the protective fence portion 10 and the opposing end surface 11 of the protective fence portion 10. Since the hook portion 21 is the only vacant and connected member, and the hook portion 21 is provided so that a gap 29 is formed between them when they are fitted as described above, When a vehicle collides, the protective fence 10 is rotationally displaced. That is, as shown in FIG. 6, when the vehicle is rear-ended from the left side, the gap 29 of the hook portion 21 is centered, for example, on the ridgeline between the bottom surface and the side surface on the side opposite to the side of the collision, or the hook portion It is rotationally displaced around 21 like the protective fence portion 10a (solid line protective fence portion).

Therefore, when the protective fence portion 10 of the protective fence 100 is rotationally displaced at the time of a vehicle collision, as shown in FIG. The end surface 11 of the protective fence 100 is exposed. If the vehicle that has collided with the side surface 13 moves along the protection fence part 10, it will collide with the end surface 11 of the protection fence part 10, and a very large impact will be generated. Therefore, the exposed portion of the protective fence 10 where the protective fence 10 is rotationally displaced to the maximum has a length within 120% of the horizontal length α of the chamfer 15 at all height positions. The gap between the couplers is set so that the rotational displacement is maximized in (the hatched range). The reason why it is set to 120% is that it is experimentally obtained that even if it is not necessarily 100%, the impact can be greatly reduced. Of course, preferably, it is designed so that the rotational displacement is within 100%. The range of the chamfered portion 15 is provided in a range above the vertical center of the hook portion 21, and as shown in FIG. should be provided. Further, the chamfered portion 15 is arranged so that the ratio of the length β on the end face side and the length γ on the side face side when the chamfered portion 15 is absent is 1:n (n is 1.0 or more). It is preferable to provide By providing it in such a range, the angle θ between the side surface 13 of the chamfered portion 15 with which the vehicle collides and the longitudinal direction becomes 45° or less, so damage when the vehicle collides can be reduced. It is also because it becomes easier to restore running after a collision. In addition, it is preferable to provide the taper position above the lower surface of the connector 20 . Although the Florida type has been described, the idea is the same for a single slope type 101 and a straight wall type 102 as shown in FIG.

The connector 20 manufactured as described above and the guard fence 100 having the connector 20 are installed as follows. First, the protective fence 100 having the connector 20 is installed on the road surface on which the boundary is to be constructed. At this time, a non-slip plate such as a rubber plate may be placed between the protection fence 100 and the road surface. As shown in FIG. 8, the protective fence 100a, which is to be placed adjacent to the installed protective fence 100, is lifted by a crane or the like, and while confirming the position, is moved so as to be adjacent to the installed protective fence 100. . Then, it is suspended so that the positioning plate portion 27 of the connector 20 is inserted into the groove 12 of the protective fence portion 10 . As a result, the position of the suspended protective fence 100 a is corrected as the positioning plate portion 27 descends in the groove 12 . When the suspended protection fence 100a is lowered as it is, the hooks 21 of the couplers 20 are automatically corrected to the positions where they are fitted to each other. At this time, even if the coupler 20 is slightly displaced from each other at the initial stage of fitting, the upper end side sliding slope 24 and the upper end side slide slope 24 formed in a tapered shape from the upper end 22 and the lower end 25 of the hook portion 21 toward the inner surface 23 By descending along the lower end side sliding slope 26, the connector 20 is naturally corrected to a position where the connector 20 is fitted while sliding. By descending as it is, the connector 20 is fitted and connected as shown in FIG. As described above, according to the protective fence 100 according to the present embodiment, simply by lowering the positioning plate portion 27 along the groove 12, the position is naturally adjusted. Cheap. In addition, since the connected protective fences 100 are fixed in relative position by the connector 20, the positioning plate portion 27, and the grooves 12, even if a car or the like collides with the protective fences 100, they can be separated from each other. Possibility can be reduced.

It goes without saying that the present invention is by no means limited to the above-described embodiments, and can be embodied in various forms as long as they fall within the technical scope of the present invention.

As shown in the above-described embodiment, it can be industrially used when producing a simple protective fence on the road surface.

DESCRIPTION OF SYMBOLS 10... Protective fence part, 10a... Protective fence part, 11... End surface, 12... Groove, 13... Side surface, 15... Chamfered part, 20... Connector, 21... Hook part, 22... Upper end, 23... Inner surface, 24 ... upper end slide slope 25 lower end 26 lower end slide slope 27 positioning plate portion 28 mounting hole 29 gap 100 protective fence 100a protective fence

Claims (4)

a protective fence having a side surface and an end surface made of concrete and having a chamfered portion between the side surface and the end surface;
a connector provided on the end surface of the protective fence;
with
The connector has a hook portion formed in a hook shape, and by sliding the hook portion of a similar connector to be connected in the vertical direction, it is possible to fit so that a gap is provided,
A gap between the connecting parts is formed so that the end face of the adjacent protective fence exposed when rotationally displaced due to collision is within 120% of the horizontal length of the chamfered part. A protective fence. 2. The protective fence according to claim 1, wherein the amount of rotational displacement of said protective fence is within the range of the chamfer. The protection according to claim 1 or 2, wherein the chamfered portion of the protective fence has a ratio of the length of the end surface to the length of the front surface of 1:n (n is 1.0 or more). fence. 4. The protective fence according to any one of claims 1 to 3, wherein the upper end of the connector is provided so as to be 35 cm or less from the road surface.

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