JP2008095472A - Post for guardrail - Google Patents

Post for guardrail Download PDF

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JP2008095472A
JP2008095472A JP2006281612A JP2006281612A JP2008095472A JP 2008095472 A JP2008095472 A JP 2008095472A JP 2006281612 A JP2006281612 A JP 2006281612A JP 2006281612 A JP2006281612 A JP 2006281612A JP 2008095472 A JP2008095472 A JP 2008095472A
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main body
base plate
hole
column main
column
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JP4864633B2 (en
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Naoyuki Kanzaki
直行 神▲崎▼
Shigeharu Nakaoka
重治 仲岡
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Shinko Kenzai Ltd
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Shinko Kenzai Ltd
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  • Refuge Islands, Traffic Blockers, Or Guard Fence (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a post for a guardrail capable of positively suppressing breakage of a joint part between a post body and a base plate by sufficiently absorbing impact force caused by the collision of a vehicle with simple structure. <P>SOLUTION: The post 1 for the guardrail comprises the base plate 11 fixed to a sill 100, and the cylindrical post body 13 erected on the sill 100 by welding the lower end to the base plate 11, and supporting a plurality of cross beams 2 receiving the collision of the vehicle. A circular through-hole 13a radially penetrating the post body 13 is formed in a region on the opposite side to the vehicle passing side near the lower end of the post body 13. The through-hole 13a has a diameter sized to be 17.5-25.0% of the diameter of the post body 13. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、防護柵の支柱に関するものである。   The present invention relates to a support fence post.

従来、下記の特許文献１には、橋梁において車道の両側に設置される防護柵が開示されている。この従来の防護柵は、複数の横梁と、その複数の横梁を支える支柱とを備えており、前記支柱は橋梁の土台に固定されたベースプレートとそのベースプレートに下端部が接合された角筒状の支柱本体とによって構成されている。そして、この特許文献１では、支柱本体の車道と反対側の平面の下端部近傍に幅方向に延びる凹部を形成している。この凹部によって、車両の衝突荷重が支柱に掛かったときに支柱本体の下端部近傍の領域の座屈を促進させることにより、車両の衝突による衝撃力を吸収して支柱本体の下端部とベースプレートとの接合部が破断するのを抑制している。   Conventionally, Patent Document 1 below discloses protective fences installed on both sides of a roadway in a bridge. This conventional protective fence includes a plurality of horizontal beams and a column supporting the plurality of horizontal beams, and the column includes a base plate fixed to the base of the bridge and a rectangular tube shape whose lower end is joined to the base plate. It is comprised by the support | pillar main body. And in this patent document 1, the recessed part extended in the width direction is formed in the lower end part vicinity of the plane on the opposite side to the roadway of a support | pillar main body. This recess promotes buckling in the region near the lower end of the column main body when a vehicle collision load is applied to the column, thereby absorbing impact force due to vehicle collision and absorbing the lower end of the column main body and the base plate. This prevents the joint portion from breaking.

また、下記の特許文献２には、上記特許文献１と同様の防護柵に用いる支柱が開示されている。この特許文献２に開示された防護柵の支柱では、角筒状の支柱本体の車道と反対側の平面の下端部近傍に幅方向に延びる切欠き部が形成されているとともに、その切欠き部を塞ぐように支柱本体の内側へ屈曲した補強プレートが溶接されている。この構造では、補強プレートを取り付けた切欠き部によって、車両の衝突荷重が支柱に掛かったときに支柱本体の下端部近傍の領域の座屈を促進させることにより、上記特許文献１と同様、車両の衝突による衝撃力を吸収して支柱本体の下端部とベースプレートとの接合部が破断するのを抑制している。
特開２００２−２９４６３２号公報 特開２００５−１８８０３１号公報 Moreover, the following patent document 2 discloses a column used for a protective fence similar to that of the above-mentioned patent document 1. In the column of the protective fence disclosed in Patent Document 2, a notch extending in the width direction is formed in the vicinity of the lower end of the plane opposite to the roadway of the square columnar column main body, and the notch A reinforcing plate bent to the inside of the column main body is welded so as to close the frame. In this structure, the notch portion to which the reinforcing plate is attached promotes buckling in a region near the lower end portion of the column main body when a collision load of the vehicle is applied to the column. The impact force due to the collision is absorbed to prevent the joint portion between the lower end portion of the column body and the base plate from breaking.
JP 2002-294632 A JP 2005-1888031 A

しかしながら、上記特許文献１及び特許文献２に開示された角筒状の支柱本体では、上記凹部または上記補強プレートが取り付けられた切欠き部から支柱本体の両側面へ座屈が波及しにくいため、支柱本体の下端部近傍の座屈を促進させにくい。このため、車両の衝突による衝撃力を十分に吸収することが困難となり、その結果、支柱本体の下端部とベースプレートとの接合部の破断を確実に防ぐことが困難となる虞がある。   However, in the prismatic column main body disclosed in Patent Document 1 and Patent Document 2, buckling is unlikely to spread from the notch portion to which the concave portion or the reinforcing plate is attached to both side surfaces of the column main body. It is difficult to promote buckling near the lower end of the column body. For this reason, it becomes difficult to sufficiently absorb the impact force due to the collision of the vehicle, and as a result, it may be difficult to reliably prevent the breakage of the joint portion between the lower end portion of the column main body and the base plate.

なお、上記特許文献２には上記角筒状の支柱本体に設けた補強プレート及び切欠き部を円筒状の支柱本体に適用することが示されているが、角筒状の支柱本体と円筒状の支柱本体では車両衝突時に生じる変形の挙動が異なるため、角筒状の支柱本体に設けた補強プレート及び切欠き部をそのまま適用したとしても円筒状の支柱本体で下端部近傍の座屈を良好に促進できるか否かは不明である。また、上記特許文献２では、円筒状の支柱本体において下端部近傍の座屈を促進させるのに適した切欠き部の具体的な構造は示されていない。従って、この特許文献２の円筒状の支柱本体を用いた防護柵の支柱でも、車両の衝突による衝撃力を十分に吸収できるかは不明であり、支柱本体とベースプレートとの接合部の破断を確実に防ぐことが困難となる虞がある。   In addition, although the said patent document 2 shows applying the reinforcement plate and notch part which were provided in the said square cylindrical column main body to a cylindrical column main body, a square cylindrical column main body and cylindrical shape are shown. Because the behavior of deformation that occurs in the case of a vehicle collision is different in this column body, even if the reinforcing plate and notch provided on the square columnar column body are applied as they are, the cylindrical column body has good buckling near the lower end. It is unclear whether it can be promoted. Moreover, in the said patent document 2, the specific structure of the notch part suitable for promoting buckling of a lower end part vicinity in a cylindrical support | pillar main body is not shown. Therefore, it is unclear whether or not the protective fence support using the cylindrical support body of Patent Document 2 can sufficiently absorb the impact force caused by the collision of the vehicle, and the joint between the support body and the base plate is surely broken. It may be difficult to prevent it.

また、一般に、簡易な構造で車両の衝突による衝撃力を吸収して支柱本体とベースプレートとの接合部の破断を抑制することが可能な防護柵の支柱が求められている。   In general, there is a need for a protective fence post that can absorb a shock force caused by a vehicle collision and suppress breakage of a joint portion between the support main body and the base plate with a simple structure.

本発明は、上記のような課題を解決するためになされたものであり、その目的は、簡易な構造で、車両の衝突による衝撃力を十分に吸収して支柱本体とベースプレートとの接合部の破断を確実に抑制することが可能な防護柵の支柱を提供することである。   The present invention has been made in order to solve the above-described problems, and an object of the present invention is to provide a simple structure that sufficiently absorbs an impact force caused by a vehicle collision and is capable of absorbing the joint portion between the column main body and the base plate. It is an object of the present invention to provide a guard post that can reliably prevent breakage.

本願発明者は鋭意検討した結果、防護柵の支柱において円筒状の支柱本体の下端部近傍の車両が通行する側と反対側の領域に円形の貫通孔を設けるとともに、その貫通孔の直径を適切に設定することによって上記課題を解決できることを見出した。すなわち、本発明による防護柵の支柱は、車両の衝突による衝撃を吸収する防護柵の支柱であって、土台に固定されるベースプレートと、前記ベースプレートに下端部が接合され、前記土台に対して立設されるとともに、車両の衝突を受ける複数の横梁を支持する円筒状の支柱本体とを備え、前記支柱本体の下端部近傍の前記車両が通行する側と反対側の領域には、当該支柱本体をその径方向に貫通する円形の貫通孔が形成されており、前記貫通孔は、前記支柱本体の直径の１７．５％以上２５．０％以下の大きさの直径を有する。   As a result of intensive studies, the inventor of the present application has provided a circular through hole in a region on the opposite side to the side where the vehicle passes near the lower end portion of the cylindrical column body in the column of the protective fence, and appropriately sets the diameter of the through hole. It was found that the above problem can be solved by setting to. That is, the protective fence post according to the present invention is a protective fence post that absorbs an impact caused by a vehicle collision, and has a base plate fixed to the base and a lower end joined to the base plate, and stands against the base. And a column-shaped column main body that supports a plurality of horizontal beams that are subject to a vehicle collision, and the column main body is located in a region near the lower end of the column main body and on the opposite side of the vehicle. A circular through hole penetrating in the radial direction is formed, and the through hole has a diameter of 17.5% or more and 25.0% or less of the diameter of the column main body.

この防護柵の支柱では、支柱本体が円筒状であるので、車両の衝突時に支柱本体の下端部近傍の車両の通行する側と反対側の領域に形成された円形の貫通孔から当該支柱本体の周方向に沿って両側に座屈が波及しやすい。このため、車両の衝突時に支柱本体の下端部近傍の座屈を有効に促進させることができる。また、この防護柵の支柱では、前記貫通孔の直径を支柱本体の直径の１７．５％以上２５．０％以下の大きさとすることによって、円形の貫通孔の大きさを支柱本体の下端部近傍の座屈を良好に促進させるのに適切な大きさに設定することができる。すなわち、この防護柵の支柱では、車両の衝突時に支柱本体の下端部近傍の座屈を有効に促進させて車両の衝突による衝撃力を十分に吸収することにより、支柱本体とベースプレートとの接合部の破断を確実に抑制することができる。また、この防護柵の支柱では、円形の貫通孔を設けるだけで支柱本体の下端部近傍の座屈を促進させることができるので、従来のように切欠き部に補強プレートを溶接する場合と異なり、簡単な構造で支柱本体の下端部近傍の座屈を促進させることができる。従って、この防護柵の支柱では、簡単な構造で車両の衝突による衝撃力を十分に吸収して支柱本体とベースプレートとの接合部の破断を確実に抑制することができる。   In the column of this protective fence, the column body is cylindrical, so that the column body has a circular through-hole formed in a region on the opposite side of the vehicle in the vicinity of the lower end of the column body in the event of a vehicle collision. Buckling tends to spread on both sides along the circumferential direction. For this reason, it is possible to effectively promote buckling in the vicinity of the lower end portion of the column main body when the vehicle collides. Moreover, in this support fence post, the diameter of the through hole is set to be 17.5% or more and 25.0% or less of the diameter of the support body, whereby the size of the circular through hole is reduced to the lower end of the support body. An appropriate size can be set to favorably promote the buckling in the vicinity. That is, in this protective fence post, the joint between the support main body and the base plate is effectively absorbed by absorbing the impact force due to the vehicle collision by effectively promoting buckling near the lower end of the support main body at the time of the vehicle collision. Can be reliably suppressed. In addition, in this support fence post, buckling in the vicinity of the lower end of the support body can be promoted simply by providing a circular through-hole, unlike the conventional case where a reinforcing plate is welded to the notch. The buckling in the vicinity of the lower end of the column main body can be promoted with a simple structure. Therefore, with this support fence post, the impact force due to the collision of the vehicle can be sufficiently absorbed with a simple structure, and the breakage of the joint between the support body and the base plate can be reliably suppressed.

また、上記防護柵の支柱において、前記貫通孔は、前記ベースプレートの上面から最も上側の前記横梁の前記車両が通行する側に最も突出した部分までの高さの９．４％以下の高さの範囲に設けられていることが好ましい。前記貫通孔を設ける高さ位置が高くなりすぎると、貫通孔による支柱本体の下端部近傍の座屈の促進効果が得にくくなるので、貫通孔を設ける高さ位置を所定の範囲内に設定することが重要となる。一方、防護柵において最も上側の横梁の車両の通行する側に最も突出した部分が車両の衝突する最も高い位置となり、その位置は車両の衝突時に防護柵の支柱に曲げモーメントを生じさせる力の作用点のうち最も高い位置となる。すなわち、この位置よりも高い位置で車両の衝突による荷重は防護柵の支柱に掛からないので、この位置を基準にして貫通孔を設ける高さ位置の範囲を設定することが好ましい。この観点に基づいて、本願発明者は鋭意検討した結果、上記のようにベースプレートの上面から最も上側の横梁の車両が通行する側に最も突出した部分までの高さの９．４％以下の高さの範囲に貫通孔を設ければ、車両の衝突時に支柱本体の下端部近傍の座屈を確実に促進させて、支柱本体とベースプレートとの溶接部の破断をより確実に防ぐことができることを見出した。   Moreover, in the support fence post, the through hole has a height of 9.4% or less of the height from the upper surface of the base plate to the most protruding portion of the upper side beam on the side where the vehicle passes. It is preferable that it is provided in the range. If the height position at which the through hole is provided becomes too high, the effect of promoting buckling in the vicinity of the lower end portion of the column main body by the through hole becomes difficult to obtain, so the height position at which the through hole is provided is set within a predetermined range. It becomes important. On the other hand, the portion of the protective fence that protrudes most on the side of the upper cross beam where the vehicle passes is the highest position where the vehicle collides, and that position is the action of a force that generates a bending moment on the protective fence column when the vehicle collides. It is the highest position among the points. That is, since a load due to a vehicle collision is not applied to the support fence post at a position higher than this position, it is preferable to set the range of the height position where the through hole is provided based on this position. Based on this point of view, the inventor of the present application has intensively studied. As a result, as described above, the height from the upper surface of the base plate to the portion of the uppermost lateral beam that protrudes most to the side through which the vehicle passes is 9.4% or less. By providing a through hole in this range, it is possible to reliably promote buckling near the lower end of the column main body in the event of a vehicle collision and more reliably prevent breakage of the welded portion between the column main body and the base plate. I found it.

以上説明したように、本発明による防護柵の支柱では、簡単な構造で車両の衝突による衝撃力を十分に吸収して支柱本体とベースプレートとの接合部の破断を確実に抑制することができる。   As described above, the support fence post according to the present invention can sufficiently absorb the impact force caused by the collision of the vehicle with a simple structure and reliably suppress the breakage of the joint portion between the support body and the base plate.

以下、本発明の実施形態を図面を参照して説明する。   Hereinafter, embodiments of the present invention will be described with reference to the drawings.

図１は、本発明の一実施形態による防護柵の支柱を適用する防護柵の構造を示した正面図であり、図２は、図１に示した防護柵を部分的に拡大して示した図である。図３は、図２に示した防護柵のＩＩＩ−ＩＩＩ線に沿った断面図であり、図４は図２に示した防護柵のＩＶ−ＩＶ線に沿った断面図である。図５は、本発明の一実施形態による防護柵の支柱の下端部近傍の構造を示した図である。図１〜図５を参照して、本発明の一実施形態による防護柵の支柱の構造について説明する。   FIG. 1 is a front view showing a structure of a guard fence to which a guard fence post according to an embodiment of the present invention is applied. FIG. 2 is a partially enlarged view of the guard fence shown in FIG. FIG. 3 is a cross-sectional view taken along line III-III of the guard fence shown in FIG. 2, and FIG. 4 is a cross-sectional view taken along line IV-IV of the guard fence shown in FIG. FIG. 5 is a view showing a structure in the vicinity of a lower end portion of a support fence post according to an embodiment of the present invention. With reference to FIGS. 1-5, the structure of the support | pillar of the guard fence by one Embodiment of this invention is demonstrated.

本実施形態による防護柵の支柱１は、図１に示すような防護柵に適用される。この防護柵は、例えば橋梁の車両が通行する車道の両側や車道と歩道との境界等に設置されるものであり、車両の衝突による衝撃を吸収するものである。そして、防護柵は、複数の支柱１と、複数の横梁２とを備えている。各支柱１は、車道に沿って所定間隔でコンクリート製の土台１００に立設されている。そして、横梁２は、この複数の支柱１の車道側に車道に沿って略水平方向に延びるように取り付けられている。本実施形態では、２本の横梁２が設けられており、これらは上下に所定の間隔を隔てて互いに平行に配置されている。そして、上側の横梁２は、支柱１の上端部近傍に取付部材４を介して取り付けられている一方、下側の横梁２は、支柱１の高さ方向の中間位置に取付部材５を介して取り付けられている。   The protective fence post 1 according to the present embodiment is applied to a protective fence as shown in FIG. This protective fence is installed, for example, on both sides of a roadway on which a bridge vehicle passes or on the boundary between a roadway and a sidewalk, and absorbs an impact caused by a vehicle collision. The protective fence includes a plurality of support columns 1 and a plurality of cross beams 2. Each column 1 is erected on a concrete base 100 at a predetermined interval along the roadway. And the cross beam 2 is attached to the roadway side of this some support | pillar 1 so that it may extend in a substantially horizontal direction along a roadway. In this embodiment, two horizontal beams 2 are provided, and these are arranged in parallel with each other at a predetermined interval in the vertical direction. The upper horizontal beam 2 is attached to the vicinity of the upper end of the column 1 via an attachment member 4, while the lower horizontal beam 2 is attached to an intermediate position in the height direction of the column 1 via an attachment member 5. It is attached.

本実施形態による防護柵の支柱１は、図２及び図３に示すように、ベースプレート１１と、円筒状の支柱本体１３とを有している。ベースプレート１１は、図４に示すように、その外形が略矩形状となるように形成されている。また、ベースプレート１１の中央部には、支柱本体１３の外径に対応した直径を有する取付穴１１ａが形成されている。そして、ベースプレート１１の取付穴１１ａの周囲４箇所にボルト穴（図示せず）が設けられているとともに、これらのボルト穴にそれぞれ挿通されたアンカーボルト１２によってベースプレート１１が土台１００に固定されている。   As shown in FIGS. 2 and 3, the protective fence post 1 according to the present embodiment includes a base plate 11 and a cylindrical post body 13. As shown in FIG. 4, the base plate 11 is formed so that its outer shape is substantially rectangular. A mounting hole 11 a having a diameter corresponding to the outer diameter of the column main body 13 is formed at the center of the base plate 11. Bolt holes (not shown) are provided at four locations around the mounting holes 11a of the base plate 11, and the base plate 11 is fixed to the base 100 by anchor bolts 12 inserted into these bolt holes, respectively. .

支柱本体１３は、円筒状に形成されているとともに、その上端部は図３に示すように車道と反対側へ行くに従って高さが低くなるように傾斜している。上記取付部材４はこの支柱本体１３の上端部の車道側に取り付けられており、この取付部材４の内部に挿通される形態で上記上側の横梁２が取り付けられている。また、上記取付部材５は、支柱本体の高さ方向の中間位置にボルト・ナットで締結されている。そして、上記下側の横梁２がこの取付部材５の内部に挿通される形態で取り付けられている。   The column main body 13 is formed in a cylindrical shape, and an upper end portion thereof is inclined so as to decrease in height as it goes to the opposite side to the roadway as shown in FIG. The mounting member 4 is mounted on the roadway side of the upper end portion of the column main body 13, and the upper horizontal beam 2 is mounted in a form that is inserted into the mounting member 4. The mounting member 5 is fastened with bolts and nuts at an intermediate position in the height direction of the column main body. The lower horizontal beam 2 is attached in such a manner that it is inserted into the attachment member 5.

また、支柱本体１３の下端部は、ベースプレート１１の前記取付穴１１ａに挿入されるとともにこのベースプレート１１の取付穴１１ａの縁部と溶接されている。これにより、支柱本体１３とベースプレート１１が結合されており、支柱本体１３が前記土台１００に対して略垂直に立設されている。   Further, the lower end portion of the column main body 13 is inserted into the mounting hole 11 a of the base plate 11 and is welded to the edge portion of the mounting hole 11 a of the base plate 11. As a result, the column main body 13 and the base plate 11 are coupled, and the column main body 13 is erected substantially perpendicular to the base 100.

そして、本実施形態では、図３及び図５に示すように、支柱本体１３の下端部近傍の車道と反対側の領域に当該支柱本体１３をその径方向に貫通する円形の貫通孔１３ａが形成されている。具体的には、この円形の貫通孔１３ａは、車道側と真反対の領域で支柱本体の幅方向の中心に設けられている。そして、貫通孔１３ａは、支柱本体１３の直径の１７．５％以上２５．０％以下の大きさの直径を有している。また、貫通孔１３ａは、ベースプレート１１の上面から上側の横梁２の前記車両が通行する側に最も突出した部分、すなわち上側の横梁２の中心線までの高さＨの９．４％以下の高さの範囲に設けられている。本実施形態による円形の貫通孔１３ａは支柱本体１３の外側から例えばドリル等の工具により穿孔することによって形成される。   And in this embodiment, as shown in FIG.3 and FIG.5, the circular through-hole 13a which penetrates the said column main body 13 to the radial direction in the area | region on the opposite side to the roadway of the lower end part of the column main body 13 is formed. Has been. Specifically, the circular through hole 13a is provided at the center in the width direction of the column main body in a region opposite to the roadway side. The through hole 13 a has a diameter of 17.5% to 25.0% of the diameter of the column main body 13. Further, the through hole 13a has a height of 9.4% or less of the height H from the upper surface of the base plate 11 to the most protruding portion of the upper horizontal beam 2 on the side where the vehicle passes, that is, the center line of the upper horizontal beam 2. It is provided in the range. The circular through hole 13a according to the present embodiment is formed by drilling from the outside of the column body 13 with a tool such as a drill.

防護柵への車両の衝突時には、横梁２に車道側から車両が衝突し、これによって横梁２を介して支柱本体１３にその上部側を車道と反対側へ押すような衝突荷重が掛かる。この際、本実施形態による支柱本体１３では、貫通孔１３ａが上下方向に拉げるとともに、貫通孔１３ａの左右両側の縁部が左右に開きながら支柱本体１３の径方向外側へ突出するように座屈が生じる。そしてこの座屈が、支柱本体１３が円筒状であることに起因して貫通孔１３ａから支柱本体１３の周方向に沿って左右両側へ波及する。このようにして、本実施形態による防護柵の支柱１では、円形の貫通孔１３ａにより車両の衝突時に支柱本体１３の下端部近傍の座屈が促進されるようになっている。   When the vehicle collides with the protective fence, the vehicle collides with the horizontal beam 2 from the roadway side, and thereby, a collision load is applied to the column main body 13 via the horizontal beam 2 so as to push the upper side to the opposite side of the roadway. At this time, in the column main body 13 according to the present embodiment, the through-hole 13a is lifted in the vertical direction, and the left and right edges of the through-hole 13a are protruded outward in the radial direction while opening left and right. Buckling occurs. And this buckling spreads to right and left both sides along the circumferential direction of the support | pillar main body 13 from the through-hole 13a resulting from the support | pillar main body 13 being cylindrical. In this way, in the protective fence post 1 according to the present embodiment, the circular through hole 13a promotes buckling in the vicinity of the lower end portion of the post body 13 at the time of a vehicle collision.

以上説明したように、本実施形態による防護柵の支柱１では、支柱本体１３が円筒状であるので、車両の衝突時に支柱本体１３の下端部近傍の車道と反対側の領域の貫通孔１３ａから当該支柱本体１３の周方向に沿って両側に座屈が波及しやすい。このため、車両の衝突時に支柱本体１３の下端部近傍の座屈を有効に促進させることができる。また、本実施形態による防護柵の支柱１では、円形の貫通孔１３ａの直径を支柱本体１３の直径の１７．５％以上２５．０％以下の大きさとすることによって、円形の貫通孔１３ａの大きさを支柱本体１３の下端部近傍の座屈を良好に促進させるのに適切な大きさに設定することができる。すなわち、本実施形態による防護柵の支柱１では、車両の衝突時に支柱本体１３の下端部近傍の座屈を有効に促進させて車両の衝突による衝撃力を十分に吸収することにより、支柱本体１３とベースプレート１１との溶接部の破断を確実に抑制することができる。   As described above, in the column 1 of the protective fence according to the present embodiment, since the column body 13 is cylindrical, the vehicle from the through hole 13a in the region opposite to the roadway near the lower end of the column body 13 at the time of a vehicle collision. The buckling tends to spread on both sides along the circumferential direction of the column main body 13. For this reason, it is possible to effectively promote buckling in the vicinity of the lower end portion of the column main body 13 at the time of a vehicle collision. Further, in the protective fence post 1 according to the present embodiment, the diameter of the circular through hole 13a is set to be 17.5% or more and 25.0% or less of the diameter of the support body 13 so that the circular through hole 13a has a diameter. The size can be set to an appropriate size for favorably promoting buckling in the vicinity of the lower end portion of the column main body 13. That is, in the protective fence column 1 according to the present embodiment, the column main body 13 is sufficiently absorbed by absorbing the impact force due to the vehicle collision by effectively promoting buckling in the vicinity of the lower end portion of the column main body 13 when the vehicle collides. And the base plate 11 can be reliably prevented from being broken.

また、本実施形態による防護柵の支柱１では、円形の貫通孔１３ａを設けるだけで支柱本体１３の下端部近傍の座屈を促進させることができるので、従来のように切欠き部に補強プレートを溶接する場合と異なり、簡単な構造で支柱本体１３の下端部近傍の座屈を促進させることができる。従って、本実施形態による防護柵の支柱１では、簡単な構造で車両の衝突による衝撃力を十分に吸収して支柱本体１３とベースプレート１１との溶接部の破断を確実に抑制することができる。   Further, in the guard fence post 1 according to the present embodiment, buckling in the vicinity of the lower end portion of the post body 13 can be promoted only by providing the circular through hole 13a. Unlike the case of welding, the buckling in the vicinity of the lower end portion of the column main body 13 can be promoted with a simple structure. Therefore, the support fence post 1 according to the present embodiment can sufficiently absorb the impact force caused by the collision of the vehicle with a simple structure, and can reliably suppress the breakage of the welded portion between the support body 13 and the base plate 11.

また、本実施形態による防護柵の支柱１では、貫通孔１３ａがベースプレート１１の上面から上側の横梁２の車道側に最も突出した部分までの高さの９．４％以下の高さの範囲に設けられている。貫通孔１３ａを設ける高さ位置が高くなりすぎると、貫通孔１３ａによる支柱本体１３の下端部近傍の座屈の促進効果が得にくくなるので、貫通孔１３ａを設ける高さ位置を所定の範囲内に設定することが重要となる。一方、防護柵において上側の横梁２の車道側に最も突出した部分が車両の衝突する最も高い位置となり、その位置は車両の衝突時に防護柵の支柱１に曲げモーメントを生じさせる力の作用点のうち最も高い位置となる。すなわち、この位置よりも高い位置で車両の衝突による荷重は防護柵の支柱１に掛からないので、この位置を基準にして貫通孔１３ａを設ける高さ位置の範囲を設定することが好ましい。本実施形態では、この観点に基づいて、上記のようにベースプレート１１の上面から上側の横梁２の車道側に最も突出した部分までの高さの９．４％以下の高さの範囲に貫通孔１３ａを設けており、その結果、車両の衝突時に支柱本体１３の下端部近傍の座屈を確実に促進させて、支柱本体１３とベースプレート１１との溶接部の破断をより確実に防ぐことができる。   Further, in the guard fence post 1 according to the present embodiment, the through hole 13a is in a range of 9.4% or less of the height from the upper surface of the base plate 11 to the portion of the upper horizontal beam 2 that protrudes most toward the roadway. Is provided. If the height position at which the through hole 13a is provided becomes too high, the effect of promoting buckling in the vicinity of the lower end portion of the column main body 13 by the through hole 13a becomes difficult to obtain, so the height position at which the through hole 13a is provided is within a predetermined range. It is important to set to. On the other hand, the portion of the protective fence that protrudes most to the roadway side of the upper horizontal beam 2 is the highest position where the vehicle collides. Among them, it is the highest position. That is, since a load due to a vehicle collision is not applied to the support fence post 1 at a position higher than this position, it is preferable to set a range of height positions where the through holes 13a are provided with reference to this position. In the present embodiment, based on this viewpoint, the through-hole is within a range of 9.4% or less of the height from the upper surface of the base plate 11 to the most protruding portion of the upper lateral beam 2 on the roadway side as described above. 13a is provided, and as a result, buckling in the vicinity of the lower end portion of the column main body 13 can be surely promoted in the event of a vehicle collision, and breakage of the welded portion between the column main body 13 and the base plate 11 can be prevented more reliably. .

次に、上記した防護柵の支柱の構成による効果を確認するために行った実験について説明する。   Next, an experiment conducted for confirming the effect of the structure of the support fence described above will be described.

この実験では、上記実施形態の構造を有する防護柵の支柱に上側の横梁の一部が取付部材を介して取り付けられたものを試験体として準備した。また、支柱本体の直径、貫通孔の直径及び貫通孔の高さ位置がそれぞれ異なる複数の試験体を準備した。なお、各試験体において、ベースプレートの上面から上側の横梁の最も車道側に突出する部分（上側の横梁の中心線の位置）までの高さは８００ｍｍとなるように統一した。そして、このような各試験体を荷重試験機にセットして静荷重試験を行った。この際、試験体の横梁が上側になるように支柱本体を水平に寝かせるとともに、荷重試験機の基部から上方に浮いた状態で試験体をセットした。また、試験体のベースプレート側の端部は所定の治具を用いて動かないように固定した、そして、荷重試験機により横梁の中心線に対応する最も上方に突出した部分に下方へ向かって荷重を掛け、支柱本体の下端部とベースプレートとの溶接部に割れが生じたか否かを確認した。   In this experiment, a test body was prepared in which a part of the upper horizontal beam was attached to a support fence post having the structure of the above embodiment via an attachment member. In addition, a plurality of test specimens having different diameters of the column main body, the diameters of the through holes, and the height positions of the through holes were prepared. In each test body, the height from the upper surface of the base plate to the portion of the upper side beam that protrudes most toward the roadway (the position of the center line of the upper side beam) was unified to be 800 mm. And each such test body was set to the load tester, and the static load test was done. At this time, the support body was laid horizontally so that the horizontal beam of the test body was on the upper side, and the test body was set in a state of floating upward from the base of the load tester. Also, the base plate side end of the test specimen was fixed so as not to move using a predetermined jig, and the load tester applied a downward load to the uppermost projecting part corresponding to the center line of the cross beam. It was confirmed whether or not a crack occurred in the welded portion between the lower end of the column main body and the base plate.

第１の実験例では、貫通孔のベースプレートの上面からの高さ位置を７５ｍｍに統一するとともに支柱本体の直径に対する貫通孔の直径の比率を変えた各試験体について上記の静荷重試験を行った。その結果が以下の表１に示されている。なお、以下の表１において荷重高さとは、ベースプレートの上面から上側の横梁の中心線までの距離であり、上記したようにこの実験では８００ｍｍに設定されている。   In the first experimental example, the above static load test was performed on each test body in which the height position of the through hole from the upper surface of the base plate was unified to 75 mm and the ratio of the diameter of the through hole to the diameter of the support body was changed. . The results are shown in Table 1 below. In Table 1 below, the load height is a distance from the upper surface of the base plate to the center line of the upper horizontal beam, and is set to 800 mm in this experiment as described above.

Figure 2008095472
Figure 2008095472

上記表１から判るように、支柱本体の直径に対する貫通孔の直径の比率が１７．５％以上２５．０％以下の場合には支柱本体の下端部とベースプレートとの溶接部に割れは生じなかった。これは、この比率の範囲内に入るように円形の貫通孔の直径を設定することによって、支柱本体に上記荷重が付加されたときに支柱本体の下端部近傍の座屈を良好に促進させることができ、その結果、支柱本体とベースプレートとの溶接部への応力集中を緩和することができたためであると考えられる。従って、この結果から、支柱本体の下端部近傍の車道と反対側の領域に、支柱本体の直径の１７．５％以上２５．０％以下の大きさの直径を有する円形の貫通孔を設けることによって、車両の衝突時に支柱本体の下端部近傍の座屈を有効に促進させて車両の衝突による衝撃力を十分に吸収することができ、さらに、支柱本体とベースプレートとの溶接部の破断を確実に抑制できることが判明した。   As can be seen from Table 1 above, when the ratio of the diameter of the through hole to the diameter of the column main body is 17.5% or more and 25.0% or less, no crack occurs in the welded portion between the lower end portion of the column main body and the base plate. It was. By setting the diameter of the circular through hole so as to fall within the range of this ratio, it is possible to favorably promote buckling near the lower end of the column body when the load is applied to the column body. As a result, it is considered that the stress concentration on the welded portion between the column main body and the base plate could be alleviated. Therefore, based on this result, a circular through hole having a diameter of 17.5% or more and 25.0% or less of the diameter of the column main body is provided in the region on the opposite side of the roadway near the lower end of the column main body. This effectively promotes buckling in the vicinity of the lower end of the column body at the time of a vehicle collision to sufficiently absorb the impact force caused by the vehicle collision, and further ensures the fracture of the welded portion between the column body and the base plate. It was found that it can be suppressed.

次に、第２の実験例では、支柱本体の直径に対する貫通孔の直径の比率を固定して貫通孔のベースプレートの上面からの高さ位置を変えた各試験体について上記静荷重試験を行った。なお、この第２の実験例では、支柱本体の直径に対する貫通孔の直径の比率を２１．９％に固定した各試験体と２１．５％に固定した各試験体とを用いた。その結果が以下の表２に示されている。なお、この第２の実験例においても荷重高さは８００ｍｍである。   Next, in the second experimental example, the static load test was performed on each test body in which the ratio of the diameter of the through hole to the diameter of the column main body was fixed and the height position of the through hole from the upper surface of the base plate was changed. . In the second experimental example, each test body in which the ratio of the diameter of the through hole to the diameter of the column main body was fixed at 21.9% and each test body fixed at 21.5% were used. The results are shown in Table 2 below. In the second experimental example, the load height is 800 mm.

Figure 2008095472
Figure 2008095472

上記表２から判るように、支柱本体の直径に対する貫通孔の直径の比率を２１．９％に固定した各試験体と２１．５％に固定した各試験体のどちらにおいても、貫通孔のベースプレートの上面からの高さ位置が７５ｍｍ以下、すなわち荷重高さに対する貫通孔の高さ位置の比率が９．４％以下の場合には支柱本体とベースプレートとの溶接部に割れが生じなかった。一方、この範囲を超えた貫通孔の高さ位置が８５ｍｍの試験体、すなわち荷重高さに対する貫通孔の高さ位置の比率が１０．６％の試験体では、支柱本体とベースプレートとの溶接部に割れが生じた。この結果は、支柱本体の下端部とベースプレートとの溶接部により近い高さ位置に貫通孔を設けることによって、その溶接部に近い領域で座屈を促進させることができるので、支柱本体に荷重が掛かったときに溶接部に対する応力集中をより緩和できることに起因すると考えられる。従って、前記貫通孔は、ベースプレートの上面から最も上側の横梁の車道側に最も突出した部分までの高さの９．４％以下の高さの範囲に設けることによって、車両の衝突時に支柱本体とベースプレートとの溶接部が破断するのをより確実に防ぐことができることが判明した。   As can be seen from Table 2 above, the base plate of the through-hole is used for both the test body in which the ratio of the diameter of the through-hole to the diameter of the column main body is fixed at 21.9% and each of the test bodies fixed at 21.5%. When the height position from the upper surface of the metal plate was 75 mm or less, that is, when the ratio of the height position of the through hole to the load height was 9.4% or less, no crack occurred in the welded portion between the column main body and the base plate. On the other hand, in a specimen having a through hole height position exceeding this range of 85 mm, that is, in a specimen having a ratio of the through hole height position to the load height of 10.6%, the welded portion between the column main body and the base plate Cracking occurred. As a result, buckling can be promoted in a region near the welded portion by providing a through hole at a height position closer to the welded portion between the lower end of the column main body and the base plate, so that a load is applied to the column main body. This is considered to be due to the fact that the stress concentration on the welded portion can be more relaxed when applied. Accordingly, the through hole is provided in a range of 9.4% or less of the height from the upper surface of the base plate to the portion of the uppermost horizontal beam that protrudes most on the roadway side. It has been found that the welded portion with the base plate can be more reliably prevented from breaking.

なお、今回開示された実施形態は、すべての点で例示であって制限的なものではないと考えられるべきである。本発明の範囲は、上記した実施形態の説明ではなく特許請求の範囲によって示され、さらに特許請求の範囲と均等の意味及び範囲内でのすべての変更が含まれる。   The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims for patent, and further includes meanings equivalent to the scope of claims for patent and all modifications within the scope.

例えば、上記実施形態では、上側の横梁２と下側の横梁２の２本の横梁を支持する支柱１を例に取って説明したが、これに限らず、３本以上の横梁を支持する防護柵の支柱についても本発明を適用することができる。   For example, in the above-described embodiment, the column 1 that supports the two horizontal beams of the upper horizontal beam 2 and the lower horizontal beam 2 has been described as an example. However, the present invention is not limited to this, and the protection supports three or more horizontal beams. The present invention can also be applied to fence posts.

本発明の一実施形態による防護柵の支柱を適用する防護柵の構造を示した正面図である。It is the front view which showed the structure of the protection fence which applies the support | pillar of the protection fence by one Embodiment of this invention. 図１に示した防護柵を部分的に拡大して示した図である。It is the figure which expanded and showed the protection fence shown in FIG. 1 partially. 図２に示した防護柵のＩＩＩ−ＩＩＩ線に沿った断面図である。It is sectional drawing along the III-III line of the guard fence shown in FIG. 図２に示した防護柵のＩＶ−ＩＶ線に沿った断面図である。It is sectional drawing along the IV-IV line of the guard fence shown in FIG. 本発明の一実施形態による防護柵の支柱の下端部近傍の構造を示した図である。It is the figure which showed the structure of the lower end part vicinity of the support | pillar of the protection fence by one Embodiment of this invention.

符号の説明Explanation of symbols

１ 支柱
２ 横梁
１１ ベースプレート
１３ 支柱本体
１３ａ 貫通孔
１００ 土台 DESCRIPTION OF SYMBOLS 1 support | pillar 2 cross beam 11 base plate 13 support | pillar main body 13a through-hole 100 foundation

Claims (2)

車両の衝突による衝撃を吸収する防護柵の支柱であって、
土台に固定されるベースプレートと、
前記ベースプレートに下端部が接合され、前記土台に対して立設されるとともに、車両の衝突を受ける複数の横梁を支持する円筒状の支柱本体とを備え、
前記支柱本体の下端部近傍の前記車両が通行する側と反対側の領域には、当該支柱本体をその径方向に貫通する円形の貫通孔が形成されており、
前記貫通孔は、前記支柱本体の直径の１７．５％以上２５．０％以下の大きさの直径を有する、防護柵の支柱。 A protective fence post that absorbs the impact of a vehicle collision,
A base plate fixed to the base;
A lower end of the base plate is joined to the base plate, and the base plate is erected with respect to the base, and includes a cylindrical column main body that supports a plurality of cross beams that receive a vehicle collision,
A circular through-hole penetrating the column main body in the radial direction is formed in a region on the opposite side to the side where the vehicle passes near the lower end of the column main body,
The through-hole is a support fence post having a diameter of 17.5% to 25.0% of the diameter of the support body. 前記貫通孔は、前記ベースプレートの上面から最も上側の前記横梁の前記車両が通行する側に最も突出した部分までの高さの９．４％以下の高さの範囲に設けられている、請求項１に記載の防護柵の支柱。   The said through-hole is provided in the range of the height of 9.4% or less of the height from the upper surface of the said baseplate to the part most protruded in the said vehicle crossing side of the uppermost said cross beam. The guard fence post according to 1.
JP2006281612A 2006-10-16 2006-10-16 Guard fence prop Active JP4864633B2 (en)

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011021436A (en) * 2009-07-17 2011-02-03 Sumikei-Nikkei Engineering Co Ltd Support for guard fence
JP2011127408A (en) * 2009-12-21 2011-06-30 Nippon Steel & Sumikin Metal Products Co Ltd Support for guard fence
KR101075193B1 (en) 2009-03-20 2011-10-19 한양대학교 산학협력단 Shock absorbing type guard-rail
CN103541302A (en) * 2013-09-25 2014-01-29 铜陵市经纬流体科技有限公司 Overpass guardrail mullion
JP2014084596A (en) * 2012-10-22 2014-05-12 Fm Railing Kk Support for guard fence
CN105256719A (en) * 2015-09-25 2016-01-20 常熟市第三市政建设有限公司 Bridge guardrail provided with sliding rails
CN105297656A (en) * 2015-11-16 2016-02-03 湖南瑞新机械制造有限公司 Road traffic safety guardrail and installing method thereof

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0841837A (en) * 1994-07-28 1996-02-13 Nippon Steel Metal Prod Co Ltd Guard fence-supporting post and production thereof
JP2005188031A (en) * 2003-12-24 2005-07-14 Nippon Steel Metal Prod Co Ltd Strut for protective fence

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0841837A (en) * 1994-07-28 1996-02-13 Nippon Steel Metal Prod Co Ltd Guard fence-supporting post and production thereof
JP2005188031A (en) * 2003-12-24 2005-07-14 Nippon Steel Metal Prod Co Ltd Strut for protective fence

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101075193B1 (en) 2009-03-20 2011-10-19 한양대학교 산학협력단 Shock absorbing type guard-rail
JP2011021436A (en) * 2009-07-17 2011-02-03 Sumikei-Nikkei Engineering Co Ltd Support for guard fence
JP2011127408A (en) * 2009-12-21 2011-06-30 Nippon Steel & Sumikin Metal Products Co Ltd Support for guard fence
JP2014084596A (en) * 2012-10-22 2014-05-12 Fm Railing Kk Support for guard fence
CN103541302A (en) * 2013-09-25 2014-01-29 铜陵市经纬流体科技有限公司 Overpass guardrail mullion
CN105256719A (en) * 2015-09-25 2016-01-20 常熟市第三市政建设有限公司 Bridge guardrail provided with sliding rails
CN105256719B (en) * 2015-09-25 2017-01-18 常熟市第三市政建设有限公司 Bridge guardrail provided with sliding rails
CN105297656A (en) * 2015-11-16 2016-02-03 湖南瑞新机械制造有限公司 Road traffic safety guardrail and installing method thereof
CN105297656B (en) * 2015-11-16 2017-05-31 湖南瑞新机械制造有限公司 Traffic safety guardrail and its installation method

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