JP2007016410A - Guardrail - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a guardrail which prevents a metal fragment from being caught and stuck in a connection between superposed beams or between the under face of the head of a bolt connecting beams and the surface of the beam. <P>SOLUTION: One end in a vehicle travel direction of one beam 2 is superposed on top of the other end closer to the vehicle side of another beam 2 that is ahead in the vehicle travel direction of one beam 2. Respective ends of beams 2 are superposed sequentially in the above manner, connected with bolts 5 penetrating bolt holes formed on the beams 2, and are supported on posts 4 erected at given intervals to form guardrail 1. Chevron parts are so formed at spots separated further from the end of the beam 2 than the bolt holes as to project toward a road from the beam 2, and a projection 3 is formed on the surface of each chevron part, which projection 3 projects at least to the same extent as the head of the bolt 5 projects and has a slope 3a formed in the direction of the long of the beam 2. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an improvement of a guardrail, and more specifically, prevents a metal piece from being stuck and attached between the beam overlap connection portion or the lower surface of the bolt head of the bolt connecting the beams and the beam surface. It is related with the guardrail made.

Guard rails, guard pipes, and the like have been widely known as road protection fences provided on general roads and highways. These protective fences for roads. It is installed on the side of the road, the median strip, etc., and prevents the traveling vehicle from jumping out of the road due to spin or slip. In particular, since the guardrail installed along the road shoulder is constructed in a belt shape extending toward the road, it is also useful as equipment for inducing a change in the road condition such as a sharp curve.
For the purpose of reducing traffic accidents at night, guardrails have been developed in which reflectors (reflecting mirrors) that efficiently reflect light such as headlights are arranged on the tops of the columns and the surface of the beam.

In general, a guardrail is provided with a beam which is plastically processed into a corrugated shape having a crest and a trough continuous in a longitudinal direction on a steel plate on a column which is erected at a predetermined interval. For example, as shown in FIG. 12 which is a vertical cross section of a general guardrail, a central trough in the width direction of the beam 52 is attached to a bracket bolted to a column 54 by a fixing bolt 53 and a nut 53 '. . Further, as shown in FIG. 13 of a perspective view of a general guardrail, the beam 52 is connected in the longitudinal direction to another beam 52 adjacent in the column 54 portion.
When the beams 52 are connected to each other, the bolt 55 is commonly used in a bolt hole (not shown) of the overlapping connection portion 52a in which the peak portion and the valley portion are overlapped, and the bolt 55 has a protruding end from the bolt hole. A nut (not shown) is screwed and fastened. By connecting the beam 52 along the road in this way, the guard rail 51 can be created, and when the traveling vehicle collides, the strut 54 and the beam 52 are deformed, so that the impact at the collision of the traveling vehicle is reduced. Absorb.

Various safety measures for ensuring the safety of pedestrians and the like have been taken for the guardrails as described above. For example, there is a guardrail in which a bolt for fixing a beam to a support column is regarded as a dangerous projection and covered with the bolt. More specifically, a predetermined amount of putty composed of an ultraviolet curable resin composition and an inorganic filler is filled in an ultraviolet transmissive cap-shaped container, and this is covered with a bolt as a dangerous protrusion. The safety of pedestrians and the like is improved by curing the putty with ultraviolet rays (see, for example, Patent Document 1). In addition, there is a guard rail that suppresses the generation of a gap in the overlapping connection portion between adjacent beams (see, for example, Patent Document 2).
Japanese Patent Publication No. 04-066962 Japanese Utility Model Publication No. 07-025022

  By the way, the case where a metal piece adheres with respect to said guard rail is confirmed over tens of thousands of places all over the country. Most of the metal pieces are considered to be part of a traveling vehicle that has collided with the guard rail and adhered, based on the result of component analysis. The metal pieces have a triangular sharp blade shape. Such metal pieces may be attached so as to be inserted between the lower surface of the bolt head connecting the beams and the surface of the beam, and may be inserted into the gap between the overlapping connection portions of the beams. May adhere. If such a sharp metal piece protrudes from the guard rail to the road side, there is a possibility that a passerby may come in contact with it, so that even if a traveling vehicle collides, the metal piece can be prevented from adhering to the guard rail It is necessary to.

  However, the guardrail disclosed in Patent Document 1 is intended to prevent a pedestrian from coming into direct contact with a bolt as a dangerous protrusion. Therefore, since it does not keep in mind that the metal pieces adhere to the overlapping connection part of these bolts and beams due to the collision of the traveling vehicle, it functions effectively against the adhesion of the metal pieces caused by the collision of the traveling vehicle. Not exclusively. Further, in the guardrail disclosed in Patent Document 2, the emphasis is placed on the assembling property and appearance of the beam. Therefore, similarly to the guardrail disclosed in Patent Document 1, the guardrail disclosed in Patent Document 2 also has metal pieces attached to the overlapping connection portion of these bolts and beams due to a collision of the traveling vehicle. Therefore, it does not always function effectively against the adhesion of metal pieces due to the collision of the traveling vehicle.

In other words, it is necessary to urgently implement a guard rail having an excellent structure in terms of its effect and cost, focusing on prevention of adhesion of metal pieces and safety of pedestrians and other passers-by.
In addition, it is necessary to propose a highly versatile guard rail that enables metal pieces to be prevented from adhering to many existing guard rails.

  Therefore, the present invention makes it possible to prevent the metal piece from being stuck and attached between the beam overlap surface and the bottom surface of the bolt head of the bolt connecting the beams and the beam surface, And it is providing the guardrail which can be applied easily also to the existing guardrail.

  Even if the vehicle comes into contact with the guard rail, the inventor has no metal piece on the guard rail unless the vehicle comes into contact with the step formed on the overlapping connection portion of the beam or the bolt head of the bolt that connects the beams. The present invention is embodied by assuming that adhesion can be prevented.

  Therefore, in order to achieve the above object, the means employed by the guardrail according to claim 1 of the present invention is formed in a corrugated shape having crests and troughs continuous in the longitudinal direction, and is formed on both end sides in the longitudinal direction. A beam provided with a bolt hole is provided, and an end portion on one end side of the beam in the vehicle traveling direction side of the beam is located above an end portion on the other end side of the vehicle side of the beam on the vehicle traveling direction side than the beam. In the guard rail that is sequentially overlapped and connected by the bolts passed through the bolt holes and supported by the pillars erected at a predetermined interval, the other end side that becomes the lower side when superimposed At the position near the bolt hole of the beam and where the beam to be connected does not interfere, at least a projection equivalent to the plate thickness of the beam is formed, and a projection having a slope portion in the longitudinal direction of the beam is formed. Those characterized by comprising.

  The means adopted by the guardrail according to claim 2 of the present invention is formed of a corrugated shape having crests and troughs continuous in the longitudinal direction, and a number of beams provided with bolt holes at both ends in the longitudinal direction. The beam ends are connected to each other by bolts passed through the bolt holes, and the guard rails are supported by pillars erected at a predetermined interval, in the vicinity of the bolt holes of the beams. In addition, at a position where the beam to be connected does not interfere with each other, at least an amount of protrusion of the bolt head protruding from the beam surface of the bolt head is formed, and a protrusion having a slope portion in the longitudinal direction of the beam is formed. It is characterized by this.

  The means adopted by the guardrail according to claim 3 of the present invention is provided with a beam formed in a corrugated shape having crests and troughs continuous in the longitudinal direction, and provided with bolt holes on both end sides in the longitudinal direction, One end of the beam on the vehicle traveling direction side is sequentially superimposed so that the end of the beam on the vehicle traveling direction side is higher than the end of the other end of the beam on the vehicle side, and passes through the bolt hole. In the guard rail that is connected by the bolts that are connected to each other and supported by the pillars that are erected at a predetermined interval, at least at a position that is near the bolt hole of the beam and that does not interfere with the beam to be connected. The bolt protrudes in the same amount as the protruding amount of the bolt head from the beam surface, and is formed with a protruding portion having a slope portion in the longitudinal direction of the beam.

  According to a fourth aspect of the present invention, in the guardrail according to the third aspect of the present invention, in the guardrail according to the third aspect, the protruding amount of the protruding portion formed on the other end side which is the lower side of the beam is at least the upper side of the beam. It is characterized in that it is set to be larger by the plate thickness of the beam than the protruding amount of the protruding portion formed on one end side.

  The means employed by the guardrail according to claim 5 of the present invention is the guardrail according to any one of claims 1 to 4, wherein the projecting portion is formed on the road side of the beam. It is the surface of a mountain part.

  In the guardrail according to claim 1 of the present invention, at least the plate of this beam is positioned in the vicinity of the bolt hole of the beam on the other end side that is the lower side when they are overlapped and at a position where the beam to be connected does not interfere. A protruding portion is formed that protrudes to the same thickness as that and has a slope portion in the longitudinal direction of the beam. Therefore, the traveling vehicle contacts the beam in a direction very close to a tangent to the surface of the guard rail, and contacts the protruding portion, but the vehicle does not contact the step generated by the overlapping of the beams. Therefore, even if a crack occurs in the vehicle body or door steel plate due to contact with the guard rail, the crack does not get caught in the overlapping connection portion of the beam, so that adhesion of metal pieces to the guard rail is prevented. be able to.

  In the guardrail according to claims 2 to 5 of the present invention, at least in the vicinity of the bolt hole of the beam and at a position where the beam to be connected does not interfere with at least the amount of protrusion of the bolt head from the beam surface. A projecting portion is formed that projects and has a slope portion in the longitudinal direction of the beam. Therefore, the traveling vehicle comes into contact with the beam in a direction very close to the surface of the guardrail, and then comes into contact with the protrusion, but the vehicle has a step caused by the overlapping of the beams and the bolt head of the bolt that connects the beams. There is no contact. Therefore, even if a crack occurs in the vehicle body or door steel plate due to contact with the guardrail, the crack is caused between the overlapped connection portion of the beam and the lower surface of the bolt head of the bolt connecting the beams to the beam surface. Therefore, it is possible to prevent the metal piece from adhering to the guard rail.

  Further, according to the guard rail according to claims 2 to 5 of the present invention, the protruding portion having the slope portion in the longitudinal direction of the beam is formed at a position farther from the end portion than the bolt hole of the beam. Only. Therefore, for example, a first metal fitting having a depression corresponding to the protruding portion and a detachable attachment to the first metal fitting with the beam sandwiched between the first metal fitting and pressing the beam from the sidewalk side By using a projecting portion forming jig composed of a second bracket to which a hydraulic actuator having a pressing bracket for projecting the beam toward the roadway is attached, a projecting portion can be easily formed on the beam of the existing guardrail at the site. Can do.

  In the guardrail according to claim 4 of the present invention, the protruding amount of the protruding portion formed on the other end side which is the lower side of the beam is at least larger than the protruding amount of the protruding portion formed on the one end side which is the upper side of the beam. It is set larger than the beam thickness. Therefore, even when the traveling vehicle comes into contact with the beam, it is possible to reliably avoid the step caused by the overlapping of the beams on the surface of the vehicle body and the contact of the bolt connecting the beam to the bolt head.

  In the guardrail according to claim 5 of the present invention, the protruding portion is formed on the surface of the peak portion protruding to the road side of the beam. Therefore, the protruding portion can be formed at the cost at the end of the beam of the guardrail.

Hereinafter, a guardrail according to Embodiment 1 of the present invention will be described with reference to the attached drawings.
FIG. 1 is a schematic plan view of a road provided with a guardrail according to Embodiment 1 of the present invention, FIG. 2 is a perspective view of the guardrail according to Embodiment 1 of the present invention as viewed from the roadway side, and FIG. It is a top view of the guardrail which concerns on form 1 of invention.

A reference symbol R shown in FIG. 1 is a one-lane road, and guard rails 1 are provided on both sides of the road R. The guardrail 1 includes a beam formed in a waveform having a crest and a trough that are continuous in the longitudinal direction and provided with bolt holes (not shown) on both ends in the longitudinal direction. The one end side on the vehicle traveling direction side indicated by is overlapped sequentially so that the beam 2 on the vehicle traveling direction side is positioned above the other end side on the vehicle side.
And it is connected by the volt | bolt 5 which let the said bolt hole pass, and is supported by the support | pillar 4 standingly arranged by predetermined spacing. Further, the beam 2 is positioned in the longitudinal direction of the beam 2 at a position farther from the end than the bolt hole, that is, in the vicinity of the bolt 5 and at a position where the beam 2 to be connected does not interfere. A projecting portion 3 having a slope portion 3a and having a configuration to be described later is formed.

  As shown in FIG. 3, the shape of the protruding portion 3 is a trapezoidal shape that is axisymmetric with respect to a central axis that passes through the center of the length of the beam 2 in a side view, and includes a flat portion and a slope portion 3a. The front shape (referred to as a shape viewed from the traveling side of the vehicle) is formed in a rectangular shape. Further, the slope 3a of the projecting portion 3 in the longitudinal direction has a gentle gradient, for example, about 20 °. Further, the projecting dimension which is the projecting amount from the surface of the beam 2, that is, the projecting dimension of the projecting portion 3 formed on the other end side below the beam 2 is at least the beam of the bolt head of the bolt 5. 2 is set to be equivalent to the projecting dimension from the surface.

  More specifically, the protruding dimension of the protruding portion 3 formed on the other end side which is the lower side of the beam 2 is formed at least on one end side which is the upper side of the beam 2, and the thickness of the bolt head of the bolt 5. It is set to be larger by at least the plate thickness of the beam 2 than the protruding dimension of the protruding part 3 set in consideration of the dimension. And this protrusion part 3 is formed only in the surface of the peak part which protrudes in the road side of the said beam 2. As shown in FIG. Incidentally, in the case of the guardrail 1 according to the first embodiment, since the plate thickness of the beam 2 is 3.2 mm, the protruding dimension of the protruding portion 3 formed on the other end side below the beam 2 is 8 mm. .2 mm, and the protruding dimension of the protruding portion 3 formed on the one end side which is the upper side is 5 mm. That is, the protruding dimension of the protruding portion 3 formed on the other end side below the beam 2 is 5 + t (beam thickness) mm. In the case of such a guardrail 1, a sleeve beam whose tip is bent and formed with a predetermined R is generally attached to the start and end portions of the guardrail 1, but a protrusion provided at the end of the beam 2. The portion 3 can also prevent the traveling vehicle from contacting the overlapping connection portion of the sleeve beam.

  Hereinafter, the operation mode of the guardrail 1 according to the first embodiment of the present invention will be described. That is, in the case of the guardrail 1 according to the first embodiment of the present invention, as described above, at least from the beam surface of the bolt head of the bolt 5 at a position farther from the end than the bolt hole (bolt 5) of the beam 2. A protruding portion 3 is formed which protrudes in the same amount as the protruding amount of the beam 2 and includes a slope portion 3 a in the longitudinal direction of the beam 2. Therefore, the traveling vehicle contacts the beam 2 in a direction very close to a tangent to the surface of the guardrail 1 and contacts the protruding portion 3 without receiving a large impact in the opposite traveling direction. Therefore, there is no step caused by the superposition of the bolts and no contact with the bolt head of the bolt 5 connecting the beam 2.

Therefore, even if a crack occurs in the body of the traveling vehicle or the steel plate of the door due to the contact of the guardrail 1 with the beam 2, the crack is caused by the overlapping connection portion 2a of the beam 2 or the bolt 5 of the bolt 5 that connects the beams 2 to each other. There is no pinching between the lower surface of the head and the surface of the beam 2.
Therefore, according to the guardrail 1 which concerns on Embodiment 1 of this invention, adhesion of the metal piece to the guardrail 1 resulting from the contact of a vehicle can be prevented reliably.

  Moreover, according to the guardrail 1 which concerns on the form 1 of this invention, as mentioned above, the slope part 3a facing the longitudinal direction of the beam 2 is provided in the position away from the edge part rather than the bolt hole (bolt 5) of the beam 2. Only the protruding part 3 is formed. Therefore, for example, a first metal fitting having a depression corresponding to the protruding portion 3 and a beam 2 sandwiched between the first metal fitting are detachably attached to the first metal fitting, and the beam 2 is attached from the sidewalk side. By using a projecting portion forming jig composed of a second bracket to which a hydraulic actuator provided with a pressing bracket for pressing and projecting the beam 2 to the roadway side is used, the beam 2 of the existing guardrail 1 can be easily applied on site. The protrusion part 3 can be formed.

  By the way, in the above embodiment 1, as is well understood from FIGS. 1 and 2, the protruding portion 3 is provided closer to the center than the second bolt 5 from the end of the beam 2. 5 and the bolt 5 can also be provided. By adopting such a configuration, for example, the traveling vehicle collides between the bolt 5 and the bolt 5 of the beam 2, and the effect that the contact of the traveling vehicle with the bolt head of the bolt 5 can be prevented. be able to.

  A guardrail according to Embodiment 2 of the present invention will be described with reference to the accompanying drawings. FIG. 4 is a perspective view of the vicinity of the beam overlapping connection portion of the guardrail according to the second embodiment of the present invention as seen from the front side, and FIG. 5 is a cross-sectional view taken along line AA of FIG. The difference between the second embodiment and the first embodiment lies in the difference in the shape of the projecting portion, and the rest of the configuration is exactly the same as in the first embodiment. The differences will be described.

  As shown in the figure, the shape of the protrusion 3 formed at the end of the beam 2 is an unequal triangular shape in a side view, and the slope of the slope part 3a that slopes upward toward the bolt 5 side is downward. The slope is set to be gentler than the slope of the slope portion 3a. And the protrusion dimension from the surface of the protrusion part 3 of the beam 2 which becomes the lower side is set larger than the protrusion dimension from the surface of the protrusion part 3 of the beam 2 which becomes the upper part. Further, the front shape of each of the slope portions 3a of the projecting portion 3 of the beam 2 on the lower side is formed in a trapezoidal shape in which the size of the top portion is smaller than the size of the bottom portion, and the slope portion of the projecting portion 3 of the beam 2 on the upper side. The front shape of 3a is formed in circular arc shape. Of course, the front shape of the slope 3a of the protrusion 3 of the beam 2 on the upper side may be the same as the front shape of each of the slope 3a of the protrusion 3 of the beam 2 on the lower side.

  In the case of the guardrail 1 according to the second embodiment of the present invention, the front shape of each of the slope portions 3a of the projecting portion 3 of the beam 2 on the lower side and the front shape of the slope portion 3a of the projecting portion 3 of the beam 2 on the upper side. Is different. However, the protrusions 3 and 3 can prevent a step caused by the overlapping of the beams 2 of the vehicle body and contact of the bolts 5 connecting the beams 2 to the bolt heads. Since 3 is formed only on the surface of the high part protruding to the road side of the beam 2, according to the guardrail 1 according to the second embodiment of the present invention, the same effect as the guardrail according to the first embodiment can be obtained. .

Guardrails according to Embodiments 3 to 8 of the present invention will be described with reference to the attached drawings.
Note that each of these forms is different only in the shape of the protruding portion, and can obtain the same effect as the above-described Embodiments 1 and 2, so that only the description relating to the shape of the protruding portion will be given.

  As shown in FIG. 6 of the perspective view of the protrusion, the protrusion 3 of the guard rail according to the third embodiment of the present invention has an unequal trapezoidal shape in a side view, and the front shape of the flat portion and the slope portion 3a is rectangular. It is formed into a shape. The slope of the slope portion 3a that faces upward in the direction of the bolt (not shown) is set to be gentler than the slope of the slope portion 3a that faces down in the direction of the bolt (not shown).

  As shown in FIG. 7 of the perspective view of the protrusion, the protrusion 3 of the guardrail according to the fourth embodiment of the present invention has an unequal triangular shape in a side view, and the front surface shape of the slope portion 3a is set to a rectangular shape. Has been. The slope of the slope portion 3a having an upward slope toward the bolt side (not shown) is gentle, and the slope of the slope portion 3a having a downward slope is steep.

  As shown in FIG. 8 of the perspective view of the protruding portion, the guard rail protruding portion 3 according to the fifth embodiment of the present invention has a bowl shape having a curved inclined surface portion 3a that is convex in the front side direction in a side view, The front shape is set to a rectangular shape.

  As shown in FIG. 9 of the perspective view of the protrusion, the guardrail protrusion 3 according to the sixth embodiment of the present invention has a wing shape substantially similar to the cross-sectional shape of the main wing of the airplane in a side view, and has an inclined surface portion 3a. The front shape is set to a rectangular shape. The slope portion 3a having a gentle upward slope toward the bolt side (not shown) has a wave-shaped curved surface that is convex on the opposite side and convex on the front side, and is lowered toward the bolt side (not shown). The slope portion 3a having a steep slope has a slightly convex outer curved surface.

  As shown in FIG. 10 of the perspective view of the protruding portion of the protruding portion 3 of the guard rail according to the seventh embodiment of the present invention, the shape seen from the side surface and the direction orthogonal to the side surface is curved convexly in the front side direction. The front shape is set to an elliptical shape having a major axis in the vertical direction.

  As shown in FIG. 11 of the perspective view of the protrusion, the protrusion 3 of the guardrail according to the eighth embodiment of the present invention is curved in a convex manner in the front side direction as viewed from the side surface and the direction orthogonal to the side surface. The front shape is set to be circular.

  By the way, in description of the guardrail which concerns on the above forms 1 thru | or 8, the shape of various protrusion parts was demonstrated. However, the protrusion provided on the beam of the guard rail can reduce the impact at the time of contact with the vehicle, and prevents the vehicle from contacting the step of the beam caused by the overlapping of the beams and the bolt head of the bolt connecting the beam. It only needs to be in shape. Moreover, in the guardrail which concerns on the said form 1 thru | or 8, when the edge part of a beam overlaps, it is connected by the volt | bolt penetrated by the bolt hole provided in the surface of the peak part which protrudes on the road side Was described as an example.

  However, for example, a guardrail configured to be attached to a bracket provided on a support column with bolts in a state where the beam ends are abutted with each other, or in a state where the beam ends overlap each other, and a peak and a valley The technical idea of the present invention can also be applied to a guardrail having a configuration in which a traveling vehicle is connected by a bolt that is inserted through a bolt hole provided on a slope between the two and that does not cause a collision of a traveling vehicle. Therefore, the scope of application of the technical idea of the present invention is not limited by the forms according to the above-described forms 1 to 8, and design changes and the like can be freely made without departing from the technical idea of the present invention.

It is a schematic plan view of the road where the guardrail which concerns on form 1 of this invention was provided. It is the perspective view which looked at the guardrail which concerns on form 1 of this invention from the roadway side. It is a top view of the guardrail which concerns on form 1 of this invention. It is the perspective view which looked at the overlapping connection part vicinity of the beam of the guardrail which concerns on the form 2 of this invention from the front side. It is the sectional view on the AA line of FIG. It is a perspective view of the protrusion part of the guardrail which concerns on the form 3 of this invention. It is a perspective view of the protrusion part of the guardrail which concerns on the form 4 of this invention. It is a perspective view of the protrusion part of the guardrail which concerns on the form 5 of this invention. It is a perspective view of the protrusion part of the guardrail which concerns on the form 6 of this invention. It is a perspective view of the protrusion part of the guardrail which concerns on the form 7 of this invention. It is a perspective view of the protrusion part of the guardrail which concerns on the form 8 of this invention. It is a longitudinal cross-sectional view of the common guardrail which concerns on a prior art example. It is a perspective view of the common guardrail which concerns on a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Guard rail 2 ... Beam, 2a ... Overlapping connection part 3 ... Projection part, 3a ... Slope part 4 ... Post 5 ... Bolt R ... Road

Claims (5)

  It is formed into a corrugated shape having peaks and valleys that are continuous in the longitudinal direction, and includes a beam provided with bolt holes at both ends in the longitudinal direction. The beams are superimposed one on top of the other end on the vehicle side of the beam on the vehicle traveling direction side of the beam, and are connected by bolts passed through the bolt holes, and are erected at a predetermined interval. In the guard rail supported by the supported column, at least in the vicinity of the bolt hole of the beam on the other end side when it is overlaid, and at a position where the beam to be connected does not interfere. A guardrail characterized in that a protrusion is formed which protrudes in the same thickness as the plate and has a slope portion in the longitudinal direction of the beam.   It is formed into a corrugated shape having crests and troughs that are continuous in the longitudinal direction, and includes a plurality of beams provided with bolt holes at both ends in the longitudinal direction. The ends of these beams are passed through the bolt holes. In the guard rail that is connected by the bolts supported by the pillars that are erected at a predetermined interval, at least in the vicinity of the bolt hole of the beam and at a position where the beam to be connected does not interfere. A guardrail characterized in that a protrusion is formed that protrudes in the same amount as the protrusion from the beam surface of the bolt head of the bolt, and is provided with a slope portion in the longitudinal direction of the beam. (Overlapping type B and C guardrails)
It is formed into a corrugated shape having peaks and valleys that are continuous in the longitudinal direction, and includes a beam provided with bolt holes at both ends in the longitudinal direction. The beams are superimposed one on top of the other end on the vehicle side of the beam on the vehicle traveling direction side of the beam, and are connected by bolts passed through the bolt holes, and are erected at a predetermined interval. In the guardrail supported by the supported column, at least the amount of protrusion of the bolt head from the beam surface at the position near the bolt hole of the beam and where the beam to be connected does not interfere. A guard rail characterized by being formed with a protruding portion that protrudes and has a slope portion in the longitudinal direction of the beam.   The protruding amount of the protruding portion formed on the other end side which is the lower side of the beam is set to be larger than the protruding amount of the protruding portion formed on the one end side which is the upper side of the beam by the plate thickness of the beam. The guardrail according to claim 3, wherein   The guard rail according to any one of claims 1 to 4, wherein the projecting portion is formed on a surface of a mountain portion projecting toward the road of the beam.

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