JP4669805B2 - Beam material for guardrail and its connection structure - Google Patents

Description

  The present invention relates to a connection structure for a road guard fence such as a guard rail, and more particularly to a road guard fence connection structure suitable for preventing adhesion of a metal piece peeled off from a traveling vehicle that contacts the road guard fence.

  Many guardrails and the like have been conventionally installed as road protection fences provided on ordinary roads and highways. These road fences prevent a vehicle with the wrong traveling direction from deviating outside the road, on the opposite lane, or on the sidewalk, while minimizing vehicle occupant injury and vehicle damage, Its purpose is to restore it in the direction of travel, and it has the purpose of suppressing pedestrians and bicycles from falling or crossing over.

  In general, a guardrail is provided with a metal corrugated beam member attached to a column that is erected with a predetermined interval. For example, as shown in FIG. 9, the beam member 113 is fixed to the support column 117 via the bracket 51 by a fixing bolt 118 and a nut 119.

  By the way, many cases where metal pieces adhere to such a guardrail have been confirmed throughout the country. This metal piece is a part of a traveling vehicle that has collided with the guardrail and peeled off and adhered. For example, as shown in FIG. 10, a sharp blade-like metal piece sticks in a state of protruding toward the roadway. ing. As shown in FIG. 10A, the metal piece is attached so as to be inserted into a gap between the head of the bolt 121 and the beam member 113 for connecting the adjacent beam members 113 in the longitudinal direction. In some cases.

  A method of preventing a part of the surface of the vehicle body from being separated and caught as a metal piece between the head of the bolt (bolt 121 shown in FIG. 10A) for connecting the beam members 113 and the beam member. Has been proposed (see, for example, Patent Document 1). In the disclosed technique disclosed in Patent Document 1, a convex shape is formed around a mounting bolt on the beam surface, and a gap between the bolt and the beam surface is buried to make it difficult to catch a vehicle body such as a vehicle.

  In addition to the case where a metal piece is attached to the gap between the head of the bolt 121 and the beam member 113 as described above, as shown in FIG. In some cases, a metal piece is attached so as to be inserted into the gap of the joint portion 131 where the portions (the trough here refers to the trough on the back surface of the beam) are overlapped. The adhesion of the metal piece as shown in FIG. 10 (b) is considered to occur for the following reason.

  When the beam members 113a and 113b are connected to each other, the guard rails are overlapped with each other on the road side of the support column 117 and joined by bolts and nuts via brackets. The traveling direction of the automobile is changed from the direction in which the beam material 113a on the roadway side is disposed as shown by the arrow A in FIG. 10B to the direction in which the beam material 113b on the roadside is disposed. Connected to. For this reason, since the gap of the joint portion 131 is not generally formed in a shape facing the traveling direction A of the automobile, the metal piece peeled off from the automobile as described above is usually separated from the beam member 113a and the beam. It cannot be attached to the connecting portion with the material 113b.

  However, when the traveling vehicle jumps out to the opposite lane and travels, it is too close to the opposite side to avoid the obstacle, and comes in contact with the beam material 113 of the guardrail and presses the beam material 113b of the connecting portion, A gap is generated at the contact portion between the beam member 113b and the beam member 113a, and a part of the vehicle body of the automobile traveling in the direction B while coming into contact with the generated gap is peeled off, stuck as a metal piece, and attached. It has become.

  In order to prevent such adhesion of metal pieces, for example, a technique as disclosed in Patent Document 2 is disclosed. In this Patent Document 2, protrusions or a large number of protrusions are formed on the beam surface on the road shoulder side in the overlapping portion of the beam material and the beam material, thereby covering the overlapping gap, thereby preventing the vehicle body from being caught. I'm trying.

However, molding such ridges or a large number of protrusions for each beam material requires an excessive amount of labor, resulting in a significant increase in manufacturing cost.
Utility Model Registration No. 3114808 Utility Model Registration No. 3114823

  Therefore, the present invention has been devised in view of the above-described problems, and the object of the present invention is in the gap between the joint portions in which the peak portions and the valley portions are overlapped with each other for adjacent beam materials. To provide a connecting structure for a road guard fence that can more effectively prevent metal pieces from being attached and can greatly improve labor and cost required for manufacturing. .

  In order to solve the above-mentioned problem, the right and left ends of the two corrugated beam materials adjacent to each other are obliquely inclined at the same inclination angle with respect to the horizontal direction. And it is set as the structure which makes a point contact with a motor vehicle by cut | disconnecting linearly.

  That is, the beam material for guardrails according to the present invention is a beam material for guardrails in which peaks and valleys are alternately formed and the connecting bolt holes are provided at both ends in the longitudinal direction of the corrugated beam material. The left and right ends of the beam material in the longitudinal direction are cut obliquely at the same inclination angle with respect to the horizontal direction.

  At this time, the left and right ends of the beam material may be cut in a straight line.

  At this time, the left and right ends of the beam material may be cut obliquely with an inclination angle of 40 to 75 °.

  In the connection structure to which the present invention is applied, when the beam material is joined to the pillars erected at a predetermined interval, the two corrugated beam materials adjacent to each other overlap the peak portion and the valley portion. In the combined state, they are connected in the longitudinal direction, and the left and right ends of the beam material are configured to be cut obliquely and linearly at the same inclination angle θ. As a result, even when the vehicle comes into contact with the right end, it is merely point contact with the vehicle, and the vehicle body does not get caught in the gap portion, so that it is possible to effectively prevent the adhesion of metal pieces. . Moreover, in the connection structure to which the present invention is applied, it is only necessary to cut the beam material in a straight line in an oblique direction, so that existing manufacturing equipment can be utilized, and the burden of labor associated with the production can be reduced. As a result, the manufacturing cost can be greatly reduced.

  Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings.

  The connection structure of the road guard fence to which the present invention is applied is applied to a guardrail provided on a general road, an expressway, or the like. FIG. 1 (a) is a perspective view showing a joint part 1 of a guardrail according to a connecting structure to which the present invention is applied, and FIG. 1 (b) is a side view thereof.

  The guardrail 4 includes a support column 41 standing along a road at a predetermined interval, and a metallic corrugated beam member 42 installed between the standing support columns 41. The support column 41 is made of a steel pipe, and the bracket 51 is attached with bolts 44a and nuts 44b. A beam member 42 is screwed to the bracket 51 by bolts 43 and nuts 44. That is, the support column 41 and the beam member 42 are fixed to each other via the bracket 51.

  The beam material 42 is connected to another beam material 42 adjacent in the vicinity of the support column 41 in the longitudinal direction. At the time of such connection, the beam portions 42 adjacent to each other are fixed by overlapping the peaks and valleys, inserting the bolts 48 into the bolt connection holes 71, and screwing the nuts 49. Will do.

  In this way, the two adjacent beam members 42 that are in contact with the front surface of the bracket 51 form a substantially continuous appearance along the longitudinal direction.

  Next, the structure of the connection structure 1 according to the present invention applied to the guard rail 4 having such a structure will be described with reference to FIGS.

  The connection structure 1 is applied to the connection portions of the beam members 42 adjacent to each other. Each beam member 42 has a trough 62 formed between two crests 61, each crest 61 has two bolt connection holes 71, and also in the trough 62. Two bolt connection holes 71 are formed. The bolts 43 and 48 described above are inserted into these bolt connection holes 71. The left end 42a and the right end 42b of the beam member 42 are cut obliquely and linearly at the same inclination angle with respect to the horizontal direction.

  That is, since the left end 42a and the right end 42b are configured at the same inclination angle θ with respect to the horizontal direction as shown in FIG. 3, the beam member 42 has a substantially parallelogram shape when viewed from the front. Composed. Incidentally, the inclination angle θ is an angle from the horizontal direction to the vertical direction, and the inclination angle θ increases as the gradient becomes steeper, and the inclination angle θ decreases as the gradient becomes gentler.

  When manufacturing such a beam member 42, a steel plate is bent to form a peak 61 and a valley 62, and then obliquely and linearly with an inclination angle θ with respect to the horizontal direction. Disconnect. By going through such a process, it becomes possible to obtain the beam material 42 composed of the left end 42a and the right end 42b as described above.

  When manufacturing the beam member 42, first, the steel plate is cut obliquely and linearly at the inclination angle θ, and then bent to form the peak portion 61 and the valley portion 62. Also good. In this case, the beam material after shaping does not form a straight line obliquely, but this method may be used because it has a shape that is almost a straight line.

  The beam member 42 having the left end 42a and the right end 42b cut obliquely at the inclination angle θ in this way is connected in the longitudinal direction with its crests and troughs overlapped as shown in FIG. The beam member 42 has a left end 42a and a right end 42b that are obliquely cut at the same inclination angle, and this inclination angle is oriented obliquely downward to the left. For this reason, the automobile that comes into contact with the guard rail 4 from the B direction first comes into contact with the upper mountain portion 61a.

  Fig.4 (a) is the enlarged view which visually recognized the upper peak part 61a from the front. In the mountain portion 61a, the right end 42b is formed obliquely downward to the left. As a result, an automobile traveling in the direction B moves from the upper right to the lower left of the right end 42b when contacting the mountain portion 61a. Rub along the c direction.

FIG. 4 (b) shows a cross-sectional configuration of the line a ₁ in Fig. 4 (a). When the car A11 contacts to such line a ₁ will come into point contact with the right end 42b. This is a phenomenon based also on the fact that the side surface of the automobile A11 is configured as a streamlined type.

FIG. 4 (c) shows a sectional configuration of the line a ₂ in FIG. 4 (a). When the car A11 contacts to such line a _2, which come in point contact similarly for the right end 42b. That is, as a result of the right end 42b being formed obliquely downward to the left with respect to the mountain portion 61a, the automobile A11 that is in contact with the peak portion 61a is always in point contact with the right end 42b in the direction c. become. For this reason, even when the automobile A11 comes into contact with the right end 42b, it is possible to prevent the point contact position of the vehicle body from moving toward the lower part of the vehicle body and peeling off the vehicle body.

  Further, as shown in FIG. 5, the side surface of the vehicle body includes a fender 22, a front seat door 23, and a rear seat door 24. At this time, the gap 25 between the fender 22 and the door 23, the gap 26 between the door 23 and the door 24, or the gap 27 between the door 24 and the rear seat panel 28 are formed in a straight line shape in a substantially vertical direction. In particular, when the metal piece peels from the vehicle body, the gaps 25 to 27 are the starting points.

  FIG. 6A is an enlarged view of the upper peak 61a viewed from the front. In the mountain portion 61a, the right end 42b is formed obliquely downward to the left. As a result, the gaps 25 to 27 in the vehicle traveling in the direction B are formed from the upper right to the lower left of the right end 42b when contacting the mountain portion 61a. Rub along the direction of the arrow c in the figure.

  Since the gaps 25 to 27 are linearly formed in a substantially vertical direction, the right ends 42b formed obliquely downward to the left are not parallel to each other, as shown in FIG. As shown, it always rubs in a point contact state. For this reason, it becomes possible to prevent peeling from the gaps 25 to 27.

  As described above, in the connection structure 1 to which the present invention is applied, when the beam member 42 is joined to the support column 41 standing at a predetermined interval, the two corrugated beam members 42 adjacent to each other are connected to each other. The crest 61 and the trough 62 are overlapped in the longitudinal direction, and the left and right ends 42a and 42b of the beam member 42 are obliquely and linearly cut at the same inclination angle θ. Composed. As a result, even when the automobile comes into contact with the right end 42b, it is only point-contacted with this, and the vehicle body does not get caught in the gap portion, so that it is possible to effectively prevent the adhesion of metal pieces. Become. Moreover, in the connection structure 1 to which the present invention is applied, when the beam member 42 is manufactured, it is only necessary to cut it in a straight line in an oblique direction, so that the existing manufacturing equipment can be utilized and the labor involved in the manufacturing can be reduced. The burden can be reduced, and as a result, the manufacturing cost can be greatly reduced.

  In the present invention, it is desirable that the inclination angle θ is 40 ° to 75 °. The reason for this is that if the inclination angle θ exceeds 75 °, there is a possibility that a line contact will occur instead of a point contact with the automobile, and the adhesion of metal pieces can be effectively prevented. become unable. On the other hand, if the inclination angle θ is less than 40 °, the consumption of the steel material increases correspondingly, leading to an increase in manufacturing cost. As the inclination angle θ is smaller, the effect of preventing adhesion of the metal piece can be improved, but the upper left of the right end 42b is separated from the bolt connection hole 71 as shown in FIG. As a result, the fixing property of the upper left portion of the right end 42b is deteriorated, and a gap is likely to be generated between other adjacent beam members 42. For this reason, the lower limit of the inclination angle θ is set to 40 °. In addition, it is desirable that the inclination angle θ is configured to be around 70 ° in consideration of the adhesion prevention of metal pieces and the consistency of manufacturability and fixability.

  Incidentally, as shown in FIG. 7B, the formation position of the bolt connection hole 71 in the beam member 42 may be shifted along the cutting direction of the right end 42b. When the horizontal interval between the bolt connection hole 71 closest to the right end 42b and the right end 42b is r, the position of each bolt connection hole 71 is shifted so that r is constant. It may be configured. As a result, even when the inclination angle θ is reduced and the gradient becomes gentler, the bolt connection hole 71 is not separated from the bolt angle, and the fixing property can be improved. Further, by arranging the bolt connection holes 71 in this manner, the consumption of the steel material can be reduced, and the manufacturing cost can be reduced.

In the above-described embodiment, the case where the left end 42a and the right end 42b of the beam member 42 are oriented obliquely to the left is described as an example, but the present invention is not limited to this. For example, as shown in FIG. 8, the same effect can be obtained even when the left end 42a and the right end 42b of the beam member 42 are oriented obliquely downward to the right.

In addition, the beam material to which the present invention is applied considers the yield of the steel material, and both ends of the beam material 42 have the same inclination angle. However, when the beams are overlapped, only the end of the beam material 42 on the roadway side is inclined. Of course, the same effect can be obtained even if attached.

(a) is a perspective view of a guardrail to which the connecting structure according to the present invention is applied, and (b) is a side view of the entire structure of the guardrail. It is a figure for demonstrating the structure of the connection structure to which this invention is applied. It is a figure shown about the whole structure of the beam material applied to the connection structure which concerns on this invention. It is a figure for demonstrating the effect of the connection structure to which this invention is applied. It is a figure which shows the example of the side surface of a vehicle body. It is another figure for demonstrating the effect of the connection structure to which this invention is applied. It is a figure which shows the other structural example of the connection structure to which this invention is applied. It is a figure shown about the case where the left end of a beam material and a right end are orientating diagonally right below. It is a side view of a general guardrail. It is a figure for demonstrating about the case where a metal piece adheres to a guardrail.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Joint part 4 Guard rail 41 Support | pillar 42 Beam material 42a Left end 42b of beam material Right end 43 of beam material Bolt 44 Nut 48 Bolt 49 Nut 51 Bracket 61 Mountain part 62 Valley part

Claims (5)

It is a beam material for guardrails in which peaks and troughs are alternately formed and provided with connecting bolt holes at both longitudinal ends of the wave-shaped beam material,
The beam material for guardrails, wherein the left and right ends in the longitudinal direction of the beam material are cut obliquely at the same inclination angle with respect to the horizontal direction.   2. The beam material for guardrail according to claim 1, wherein both left and right ends of the beam material are cut linearly.   The beam material for a guardrail according to claim 1 or 2, wherein the left and right ends of the beam material are cut obliquely with an inclination angle of 40 to 75 °.   The guardrail according to any one of claims 1 to 3, wherein at least one row of bolt connection holes in the longitudinal direction is formed in the left and right ends at the same length from the end of the beam member. Beam material.   The guardrail beam material according to any one of claims 1 to 4 is overlapped with two adjacent guardrail beam materials at a predetermined interval in the longitudinal direction of the beam material and overlapped at an end thereof, and bolted Connecting structure for beam material for guardrail.

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