JP6733933B2 - Vehicle restraint structure for bridge landslide - Google Patents

Vehicle restraint structure for bridge landslide Download PDF

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JP6733933B2
JP6733933B2 JP2016107215A JP2016107215A JP6733933B2 JP 6733933 B2 JP6733933 B2 JP 6733933B2 JP 2016107215 A JP2016107215 A JP 2016107215A JP 2016107215 A JP2016107215 A JP 2016107215A JP 6733933 B2 JP6733933 B2 JP 6733933B2
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cover
ground
riding
bridge
ground cover
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JP2017214713A (en
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充洋 北野
充洋 北野
佐川 就一
就一 佐川
圭祐 中野
圭祐 中野
橋本 徹
徹 橋本
陽介 谷
陽介 谷
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Sekisui Jushi Corp
Hinode Ltd
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Sekisui Jushi Corp
Hinode Ltd
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Description

本発明は、特に車両が通行する道路用橋梁における、橋梁地覆への車両乗り上げ抑制構造に関する。 The present invention relates to a structure for restraining a vehicle from riding onto a bridge ground covering, particularly in a road bridge through which a vehicle passes.

近年、老朽化した道路構造物などの社会インフラが損傷することにより、死傷者の発生するような重大事故が発生している。このため、老朽化した社会インフラの更新が急務となっており、この更新が国や自治体によって推進されている。 In recent years, due to damage to aging road structures and other social infrastructures, serious accidents have occurred that may result in casualties. For this reason, there is an urgent need to renew aging social infrastructure, and this renewal is being promoted by the national and local governments.

これに関連した既設橋梁用防護柵の更新工法につき、例えば、本願の出願人等により特許文献1に記載された工法が提案されている。この工法は、まず、コンクリート製の地覆から既設の橋梁用防護柵を除去し、更に、既設アンカーボルトにおいて地覆から突出した部分を除去する。この後、地覆に新しいアンカーボルト(例えば後施工アンカーボルト)を設置することで、地覆に新しい橋梁用防護柵を取り付ける工法である。 As a related construction method for the existing protective fence for bridges, for example, the construction method described in Patent Document 1 has been proposed by the applicant of the present application. In this method, first, the existing bridge protection fence is removed from the concrete ground cover, and further, the part of the existing anchor bolt protruding from the ground cover is removed. After this, a new anchor bolt (for example, a post-installed anchor bolt) is installed on the ground cover to attach a new bridge protection fence to the ground cover.

ところで、特に自治体(都道府県及び市区町村)が管理する橋梁(道路用橋梁)は、国が管理する橋梁に比べて、例えば設置時期が古かったり橋長が短かったりすること等により地覆の高さが低く形成されていることが多い。 By the way, in particular, bridges (road bridges) managed by local governments (prefectures and municipalities) are vulnerable to land cover due to, for example, the installation period being older or the bridge length being shorter than the bridges managed by the national government. The height is often low.

車両が通行する道路用橋梁において、このように地覆の高さが低いと、ハンドル操作を誤ったり事故を起こしたりしたことにより、橋梁上で通行可能な領域である車道を逸脱しつつある車両が、容易に地覆を乗り越えてしまう可能性がある。そうすると、防護柵が設けられていない橋梁ではそのままで、防護柵が設けられている橋梁では車両が防護柵を突き破り、車両が河川などに落下してしまうことにより事故が拡大してしまうおそれがある。 In the case of a road bridge through which vehicles pass, when the height of the ground cover is low in this way, the vehicle is deviating from the roadway that is a passable area on the bridge due to an incorrect steering operation or an accident. However, there is a possibility that it will easily get over the ground cover. If this is the case, there is a risk that the accident will spread if the bridge does not have a protective fence, but the bridge does have a vehicle that breaks through the protective fence and the vehicle falls into a river or the like. ..

特許第5190599号公報Japanese Patent No. 5190599

そこで本発明は前記問題に鑑み、高さの低い地覆であっても、車両が地覆を乗り越えてしまう可能性を減少させることのできる、橋梁地覆への車両乗り上げ抑制構造を提供することを課題とする。 Therefore, in view of the above problems, the present invention provides a vehicle landing restraining structure for a bridge ground cover, which can reduce the possibility of a vehicle overcoming the ground cover even with a low ground cover. Is an issue.

本発明は、車両が通行する道路用橋梁における地覆上面に対し、下面が少なくとも車道側に固定され、上面が当該地覆上面よりも高い位置にある乗り上げ抑制部材を備える、橋梁地覆への車両乗り上げ抑制構造である。 The present invention is directed to a bridge ground cover, in which a lower surface is fixed to at least a road side with respect to a ground cover upper surface of a road bridge through which a vehicle passes, and a top restraint member is provided at a position where the upper surface is higher than the ground cover upper surface. This is a structure for restraining the vehicle from riding.

この構成によると、地覆に衝突する車両が早い時点で接する部分である、地覆上面の車道側に、地覆上面よりも高い位置にある乗り上げ抑制部材を備えることで、乗り上げ抑制部材の分、地覆の位置において車両が乗り越えるべき高さを高くできる。このため、車道を逸脱しつつある車両が地覆を乗り越えてしまうことを抑制できる。 According to this configuration, by providing the ride-in suppressing member at a position higher than the ground-cover upper surface on the roadway side of the ground-cover upper surface, which is a portion where the vehicle colliding with the ground cover contacts at an early point, It is possible to increase the height at which the vehicle should get over at the position of the ground cover. Therefore, it is possible to prevent the vehicle deviating from the roadway from crossing the ground cover.

また、前記乗り上げ抑制部材の少なくとも上方を覆うカバーを備えるようにできる。 Further, it is possible to provide a cover that covers at least the upper side of the riding restraining member.

この構成によると、美観を向上した橋梁地覆への車両乗り上げ抑制構造とできる。 According to this structure, it is possible to provide a vehicle riding restraining structure that improves the aesthetic appearance of the bridge.

また、前記乗り上げ抑制部材は地覆幅方向に並ぶように複数配置され、各乗り上げ抑制部材の地覆幅方向における配置間隔は可変であるものとできる。 Further, a plurality of the ride-on restraint members may be arranged side by side in the ground cover width direction, and the arrangement interval of each ride-on restraint member in the ground cover width direction may be variable.

この構成によると、複数の乗り上げ抑制部材を、地覆の幅寸法に合わせて距離可変で配置できるので、種々の幅寸法の地覆に対応できる。このため既設の地覆に対して容易に車両乗り上げ抑制構造を付加できる。 According to this configuration, a plurality of riding restraining members can be arranged with variable distances according to the width dimension of the ground covering, so that it is possible to cope with the ground covering of various width dimensions. Therefore, it is possible to easily add the vehicle running restraining structure to the existing ground cover.

また、前記乗り上げ抑制部材は、中空で地覆の長手方向に沿う長尺状体とできる。 Further, the ride-on restraint member may be a hollow elongated body extending along the longitudinal direction of the ground cover.

この構成によると、中空であるため乗り上げ抑制部材を軽量に構成できるので、道路用橋梁にかかる重量負担の増加を避けつつ、地覆の位置において車両が乗り越えるべき高さを高くできる。 According to this configuration, since the ride-on restraint member can be configured to be lightweight because it is hollow, it is possible to increase the height at which the vehicle should get over at the position of the ground cover while avoiding an increase in weight burden on the road bridge.

本発明によると、車道を逸脱しつつある車両が地覆を乗り越えてしまうことを抑制できる。よって、高さの低い地覆であっても、車両が容易に地覆を乗り越えてしまう可能性を減少させることのできる、橋梁地覆への車両乗り上げ抑制構造を提供できる。 According to the present invention, it is possible to prevent a vehicle deviating from the roadway from crossing the ground cover. Therefore, it is possible to provide a vehicle run-in restraining structure for the bridge ground cover, which can reduce the possibility that the vehicle easily gets over the ground cover even if the ground cover has a low height.

本発明につき、橋梁地覆への車両乗り上げ抑制構造を構成する全体カバー及び乗り上げ抑制部材を備えた実施形態に係る橋梁用防護柵を地覆上に設けた状態を示し、(a)は正面図、(b)は平面図、(c)は(b)のI−I矢視の縦断面図である。According to the present invention, there is shown a state in which a bridge protective fence according to an embodiment including an overall cover and a riding restraining member constituting a vehicle riding restraining structure on a bridge ground covering is provided on the ground covering, and (a) is a front view. , (B) is a plan view, and (c) is a vertical sectional view taken along the line I-I of (b). 同橋梁用防護柵(横梁を除く)を当該地覆上に設けた状態を示し、全体カバー及び乗り上げ抑制部材を二点鎖線表示した、斜め上方から見た場合の斜視図である。FIG. 3 is a perspective view showing a state in which a protective fence for bridges (excluding a lateral beam) is provided on the ground cover, and an overall cover and a riding restraining member are indicated by a two-dot chain line when viewed from diagonally above. 同橋梁用防護柵(横梁を除く)で地覆を図示省略した状態を示す、斜め下方から見た場合の斜視図である。FIG. 3 is a perspective view showing a state in which the ground cover is omitted in the protective fence for a bridge (excluding a lateral beam) when viewed obliquely from below. 同橋梁用防護柵(横梁を除く)を地覆上に設けた状態を示し、全体カバー及び乗り上げ抑制部材を二点鎖線表示したものであって、(a)は正面図、(b)は平面図、(c)は(b)のII−II矢視の縦断面図(横梁を二点鎖線で表示)である。The state in which the protective fence for bridges (excluding horizontal beams) is provided on the ground cover, and the overall cover and the ride-on restraint member are shown by a chain double-dashed line, (a) is a front view, (b) is a plan view FIG. 1C is a vertical cross-sectional view taken along the line II-II of FIG. 2B (a horizontal beam is indicated by a chain double-dashed line). 同橋梁用防護柵のベース部材を示し、(a)は斜め上方から見た場合の斜視図、(b)は斜め下方から見た場合の斜視図である。The base member of the bridge protection fence is shown, (a) is a perspective view when it sees from diagonally upward, (b) is a perspective view when seeing from diagonally downward. 同橋梁用防護柵のベース部材を示し、(a)は平面図、(b)は底面図、(c)は(b)のIII−III矢視の縦断面図である。The base member of the protection fence for bridges is shown, (a) is a top view, (b) is a bottom view, (c) is a vertical cross-sectional view of the III-III arrow of (b). 本発明につき、橋梁地覆への車両乗り上げ抑制構造を構成する乗り上げ抑制部材を示し、(a)は平面図、(b)は左側面図である。In the present invention, a riding restraining member constituting a vehicle riding restraining structure on a bridge ground cover is shown, (a) is a plan view and (b) is a left side view. 橋梁用防護柵の設置工法につき、(a)〜(f)に順を追って示した概略図である。It is the schematic which showed sequentially about (a)-(f) about the installation method of the guard fence for bridges.

次に、本発明につき実施形態を取り上げて説明を行う。なお、本実施形態はあくまでも本発明を理解するための一例を示したに過ぎず、各部の形状、構造、材質等に関し、本実施形態以外のバリエーションが、本発明の要旨を逸脱しない範囲内で許容されていることは言うまでもない。 Next, embodiments of the present invention will be described. It should be noted that the present embodiment is merely an example for understanding the present invention, and regarding the shape, structure, material, etc. of each part, variations other than the present embodiment are within the scope not departing from the gist of the present invention. Needless to say, it is allowed.

また、以下説明における「前後左右」の表現は、図1(b)(c)、図2、図5(a)(b)、図6(a)に記載した方向に基づき、「上下方向」の表現は、図2に記載した方向に基づいている。 Further, in the following description, the expression “front and back, left and right” is based on the directions shown in FIGS. 1(b) and (c), FIG. 2, FIGS. 5(a) and 5(b), and FIG. The expression is based on the orientation described in FIG.

本実施形態の、車両乗り上げ抑制構造を構成するカバー5及び乗り上げ抑制部材6に関する説明に先立ち、カバー5及び乗り上げ抑制部材6の取り付け対象である地覆Wに対して共に設けられる橋梁用防護柵の設置構造の実施形態につき説明する。本実施形態の橋梁用防護柵の設置構造として、図1〜図3、図4(a)〜(c)に示すように構成され、「高欄」とも呼ばれる支柱1及び横梁2(図4(c)にのみ示す)が組み合わされてなる橋梁用防護柵に加え、地覆Wと支柱1との間に配置されるアタッチメントとして機能するベース部材3を備える。 Prior to the description of the cover 5 and the riding restraining member 6 which constitute the vehicle riding restraining structure of the present embodiment, a bridge protective fence provided together with the ground cover W to which the cover 5 and the riding restraining member 6 are attached is described. An embodiment of the installation structure will be described. 1 to 3 and 4(a) to 4(c) as an installation structure of the bridge protective fence of the present embodiment, the pillar 1 and the cross beam 2 (also referred to as "railings") (see FIG. 4(c)). In addition to the protection fence for a bridge formed by combining the above), a base member 3 that functions as an attachment is disposed between the ground cover W and the pillar 1.

ベース部材3は鋳鉄製(より詳しくはダクタイル鋳鉄製)である。ただし、ベース部材3の素材はこれに限定されず、例えばアルミ鋳物、鉄、ステンレス合金等、種々の素材で形成できる。このベース部材3は、図5(a)(b)及び図6(a)〜(c)に示す形状のものである。このベース部材3は、図2及び図4(a)〜(c)に示すように地覆W上に配置される場合において、前方が橋梁上の道路に面するように位置し、左右方向が地覆Wの延長方向(左右方向)に位置する。このベース部材3は、地覆Wから後方、つまり橋梁幅方向(前後方向)外側に張り出すように地覆W上に固定される。 The base member 3 is made of cast iron (more specifically, ductile cast iron). However, the material of the base member 3 is not limited to this, and can be formed of various materials such as aluminum casting, iron, and stainless alloy. The base member 3 has a shape shown in FIGS. 5A and 5B and FIGS. 6A to 6C. When the base member 3 is arranged on the ground cover W as shown in FIGS. 2 and 4A to 4C, the base member 3 is positioned so that the front faces the road on the bridge, and the left-right direction is It is located in the extension direction (horizontal direction) of the ground cover W. The base member 3 is fixed on the ground cover W so as to project rearward from the ground cover W, that is, outside the bridge width direction (front-back direction).

ベース部材3における前方寄りの位置にはアンカーボルト取付部31が形成されている。このアンカーボルト取付部31には4個のアンカーボルト取付孔311が形成されており、地覆Wに上面から埋め込まれたアンカーボルトB1に対してナット止めで締結される。なお、アンカーボルトB1は上下方向に延びるように地覆Wに埋め込まれる。アンカーボルト取付孔311は、左右方向に長い長孔、つまり、地覆Wへの設置時において地覆Wの延長方向(左右方向)に沿って延びる長孔とされている。なお、地覆Wの延長方向は橋梁幅方向に対して交わる(本実施形態では直交する)方向である。このようにアンカーボルト取付孔311が長孔とされたことにより、例えばアンカーボルトB1の設置予定位置に地覆W内部の鉄筋が存在する場合、鉄筋を避けるためにアンカーボルトB1をずらせて設置できる。 Anchor bolt attachment portion 31 is formed at a position closer to the front of the base member 3. The anchor bolt mounting portion 31 has four anchor bolt mounting holes 311 formed therein, and is fastened with a nut to the anchor bolt B1 embedded in the ground covering W from the upper surface. The anchor bolt B1 is embedded in the ground covering W so as to extend in the vertical direction. The anchor bolt attachment hole 311 is a long hole that is long in the left-right direction, that is, a long hole that extends along the extension direction (the left-right direction) of the ground cover W when it is installed on the ground cover W. The extension direction of the ground cover W is a direction intersecting with the bridge width direction (orthogonal in the present embodiment). Since the anchor bolt attachment hole 311 is made a long hole in this way, for example, when there is a reinforcing bar inside the ground cover W at the planned installation position of the anchor bolt B1, the anchor bolt B1 can be displaced and installed to avoid the reinforcing bar. ..

本実施形態のアンカーボルト取付部31には地覆Wの延長方向に向かって2列で4個のアンカーボルト取付孔311が形成されているが、アンカーボルト取付孔311の形成数はこれに限定されない。例えば、3列以上とすることができ、また、アンカーボルト取付孔311として形成された一つの長孔を共用するようにして、2本のアンカーボルトB1が取り付けられるようアンカーボルト取付部31を構成することもできる。 Although four anchor bolt mounting holes 311 are formed in two rows in the extension direction of the ground covering W in the anchor bolt mounting portion 31 of the present embodiment, the number of anchor bolt mounting holes 311 formed is limited to this. Not done. For example, the number of rows can be three or more, and the anchor bolt attachment portion 31 is configured so that two anchor bolts B1 can be attached by sharing one elongated hole formed as the anchor bolt attachment hole 311. You can also do it.

アンカーボルト取付部31は、図5(a)及び図6(a)(c)に示すように凹部312を有する。凹部312は前方に開放された空間を有している。このため、アンカーボルトB1を締め付けるための工具がベース部材3に干渉しにくく、作業員による締め付け作業を円滑に行うことができる。一つの凹部312には、前後左右方向にずれた二つのアンカーボルト取付孔311が形成されている。 The anchor bolt attachment portion 31 has a recess 312 as shown in FIGS. 5(a) and 6(a)(c). The concave portion 312 has a space that is open to the front. Therefore, the tool for tightening the anchor bolt B1 hardly interferes with the base member 3, and the tightening work by the worker can be smoothly performed. In one recess 312, two anchor bolt mounting holes 311 that are offset in the front-rear and left-right directions are formed.

ベース部材3の1台あたり、本実施形態では4個のアンカーボルト取付孔311が形成されている。図6(a)に示すように、そのうち後側(橋梁幅方向の外側)の列に位置する2個は左右方向で相対的に小さい間隔(孔間隔)W311bで設けられ、前側(橋梁幅方向の内側)の列に位置する2個は左右方向で相対的に大きい間隔(孔間隔)W311fで設けられている。つまり、前後各列に属するアンカーボルト取付孔311は、前後方向にずれて配置されている。なお、これに限定されず、例えば、前方に位置する2個と後方に位置する2個とを同一間隔で設けることで、各列に属するアンカーボルト取付孔311が、前後方向に一致して配置されていてもよい。また、アンカーボルト取付孔311の左右方向間隔W311b,W311fは、支柱1の幅寸法(地覆Wの延長方向における寸法)よりも大きく設定することが好ましい。アンカーボルトB1を支柱1の幅寸法よりも小さい間隔で配置した場合、アンカー強度の十分な発揮が期待できないからである。 In this embodiment, four anchor bolt attachment holes 311 are formed per base member 3. As shown in FIG. 6A, two of them in the rear (outer side in the bridge width direction) row are provided at relatively small intervals (hole intervals) W311b in the left-right direction, and the front side (bridge width direction). The two located in the (inside) row are provided at relatively large intervals (hole intervals) W311f in the left-right direction. That is, the anchor bolt attachment holes 311 belonging to each of the front and rear rows are arranged so as to be displaced in the front and rear direction. Note that the present invention is not limited to this, and for example, by providing two located at the front and two located at the rear at the same interval, the anchor bolt mounting holes 311 belonging to each row are arranged so as to be aligned in the front-rear direction. It may have been done. In addition, it is preferable that the lateral distances W311b and W311f between the anchor bolt attachment holes 311 are set to be larger than the width dimension of the pillar 1 (dimension in the extension direction of the ground cover W). This is because when the anchor bolts B1 are arranged at intervals smaller than the width dimension of the support column 1, sufficient anchor strength cannot be expected.

複数のアンカーボルト取付孔311は、地覆Wの延長方向における配置の間隔につき、複数のアンカーボルトB1の地覆Wへの埋め込み深さDB1(図4(c)参照)を基準とした比率で0.5〜3.0、好ましくは、地覆Wの押抜せん断面積が最大になる条件から、前記比率で0.5〜2.0となる間隔で配置されている。なお、複数のアンカーボルトB1の埋め込み深さDB1は、個々の寸法にばらつきがある場合には平均値を用いるものとする。この配置により、少なくとも地覆Wの延長方向でのアンカーボルト取付孔311の間隔に応じて、地覆Wを構成するコンクリートにコーン破壊(下すぼみの円錐形状の破壊であって、破壊深さは埋め込み深さDB1に対応する)が生じる領域を隣接するコーン破壊が生じる領域から適度に離すことができる。つまり、複数のコーン破壊が生じる領域を極力重ならないようにできる。特に、各列に属するアンカーボルト取付孔311(本実施形態では後側(橋梁幅方向の外側)の列に位置するアンカーボルト取付孔311と、前側(橋梁幅方向の内側)の列に位置するアンカーボルト取付孔311)が左右方向にずれて配置された場合には、各列に属するアンカーボルト取付孔311が前後にまっすぐ並んで配置された場合と比べ、前後各列の間隔が同一でも、前記コーン破壊が生じる領域を容易に離すことができる。本実施形態のように複数のアンカーボルト取付孔311を配置することで、アンカーボルトB1に働く引き抜き方向の外力、及び、水平方向の外力に対する強度を向上できる。このため、コンクリートの体積が十分に確保できない、幅の狭い地覆Wであっても、複数のアンカーボルトB1により確実にベース部材3を支持できる。 The plurality of anchor bolt mounting holes 311 are arranged at a ratio based on the embedded depth DB1 (see FIG. 4C) of the plurality of anchor bolts B1 in the ground cover W with respect to the arrangement intervals in the extension direction of the ground cover W. From 0.5 to 3.0, preferably from the condition that the punching shear area of the ground covering W is maximized, they are arranged at intervals of 0.5 to 2.0 in the ratio. It should be noted that the embedding depth DB1 of the plurality of anchor bolts B1 uses an average value when the individual dimensions vary. With this arrangement, at least in accordance with the distance between the anchor bolt attachment holes 311 in the extension direction of the ground covering W, the concrete that constitutes the ground covering W is crushed by a cone (a crushed cone having a lower recess, and the crushing depth is The region in which the embedding depth DB1 is generated) can be appropriately separated from the adjacent region in which the cone destruction occurs. In other words, it is possible to prevent the regions where a plurality of cones are destroyed from overlapping as much as possible. In particular, the anchor bolt attachment holes 311 belonging to each row (in the present embodiment, the anchor bolt attachment holes 311 located in the row on the rear side (outside in the bridge width direction) and the anchor bolt attachment holes 311 located in the row on the front side (inside in the bridge width direction)) When the anchor bolt mounting holes 311) are arranged to be displaced in the left-right direction, compared with the case where the anchor bolt mounting holes 311 belonging to each row are arranged side by side in a straight line in the front-rear direction, The area where the cone breakage occurs can be easily separated. By arranging the plurality of anchor bolt mounting holes 311 as in the present embodiment, it is possible to improve the strength against the external force in the pull-out direction that acts on the anchor bolt B1 and the external force in the horizontal direction. Therefore, the base member 3 can be reliably supported by the plurality of anchor bolts B1 even if the ground cover W has a narrow width and cannot secure a sufficient volume of concrete.

ベース部材3は、底面3aから上面3bまでの距離(凹部312の上端からベース部材3の底面3aまでの距離)が、地覆Wの上面からアンカーボルトB1が突出する高さよりも大きいものとされている。このため、図4(a)(c)に示すように、地覆Wから突出したアンカーボルトB1の上端部分をこの凹部312に納めるようにでき、ベース部材3の上面3bから突出しないようにできる。よって、後述のカバー5を設けない場合にあっては、地覆W上にベース部材3を取り付けた際の美観に優れる。更に、もし車両がベース部材3上に乗り上げた場合であっても、アンカーボルトB1が三方から「壁」で囲まれた状態となっていることから、アンカーボルトB1の周囲に何もない状態に比べると、アンカーボルトB1の上端部分がタイヤに当たることを抑制できるため、バースト等のタイヤ損傷が起こりにくい。 In the base member 3, the distance from the bottom surface 3a to the top surface 3b (the distance from the upper end of the recess 312 to the bottom surface 3a of the base member 3) is larger than the height at which the anchor bolt B1 projects from the top surface of the ground cover W. ing. Therefore, as shown in FIGS. 4A and 4C, the upper end portion of the anchor bolt B1 protruding from the ground cover W can be housed in the recess 312, and the anchor bolt B1 can be prevented from protruding from the upper surface 3b of the base member 3. .. Therefore, when the cover 5 described later is not provided, the aesthetic appearance when the base member 3 is attached onto the ground covering W is excellent. Further, even if the vehicle rides on the base member 3, since the anchor bolt B1 is surrounded by the "walls" from the three sides, there is nothing around the anchor bolt B1. In comparison, since the upper end portion of the anchor bolt B1 can be prevented from hitting the tire, tire damage such as burst is less likely to occur.

ベース部材3における後方の領域には支柱取付部32が形成されている。この支柱取付部32の上面は支柱1の下端プレート11が配置できる形状とされている。この支柱取付部32には支柱取付用ボルト孔321が形成されており、支柱取付用ボルトB2が取り付けられて、支柱1の下端プレート11が固定される。ベース部材3は図4(c)に示すように、この支柱取付部32において、底面3aから上面3bにわたって必要となる断面性能が確保されており、支柱1及び横梁2の荷重、及び、例えば強風時や車両の衝突時に、支柱1及び横梁2が橋梁幅方向外側(後方)に倒れ込もうとすることによりベース部材3に働く曲げ応力について、ベース部材3の撓みを弾性範囲内とし、材料の耐力値以下におさめることが可能である。 A column mounting portion 32 is formed in a rear region of the base member 3. The upper surface of the column mounting portion 32 is shaped so that the lower end plate 11 of the column 1 can be arranged. A column mounting bolt hole 321 is formed in the column mounting portion 32, and a column mounting bolt B2 is mounted to fix the lower end plate 11 of the column 1. As shown in FIG. 4( c ), the base member 3 has the cross-section performance required from the bottom surface 3 a to the top surface 3 b in the strut mounting portion 32, and the load of the strut 1 and the lateral beam 2 and, for example, strong wind. The bending stress acting on the base member 3 due to the strut 1 and the lateral beam 2 falling toward the outside (backward) in the bridge width direction at the time of a vehicle collision or the like causes the bending of the base member 3 to fall within the elastic range, and It is possible to keep it below the proof stress value.

支柱取付部32に支柱取付用ボルト孔321は4個設けられている。そのうち前方に位置する2個は左右方向で相対的に小さい間隔で設けられ、後方に位置する2個は左右方向で相対的に大きい間隔で設けられている。なお、これに限定されず、例えば、前方に位置する2個と後方に位置する2個とを同一間隔で設けることもできる。図6(c)に示すように、支柱取付用ボルト孔321は底面3a側において拡大された拡大部321aを有する。この拡大部321aは、図5(b)及び図6(b)に示すように、底面視で左右方向に対向する平面321bを有する形状である。支柱取付用ボルトB2として六角ボルトが用いられた場合、図4(c)に示すように、この拡大部321aにはボルト頭部が位置する。ボルト頭部は平面321bに当たることにより、支柱取付用ボルトB2の回り止めがなされる。このため、支柱取付用ボルトB2に対して上面3b側からナットをねじ込むだけでベース部材3に支柱1を固定できる。このように拡大部321aにボルト頭部が位置するよう構成した場合、カバー5の位置決めや支柱1の仮固定がしやすいというメリットがある。 Four pillar mounting bolt holes 321 are provided in the pillar mounting portion 32. Two of them located at the front are provided at relatively small intervals in the left-right direction, and two at the rear are provided at relatively large intervals in the left-right direction. Note that the present invention is not limited to this, and for example, two pieces located in the front and two pieces located in the rear can be provided at the same interval. As shown in FIG. 6C, the pillar mounting bolt hole 321 has an enlarged portion 321a that is enlarged on the bottom surface 3a side. As shown in FIGS. 5B and 6B, the enlarged portion 321a has a shape having flat surfaces 321b facing each other in the left-right direction in bottom view. When a hexagonal bolt is used as the pillar mounting bolt B2, the head portion of the bolt is located at the enlarged portion 321a, as shown in FIG. 4C. The head portion of the bolt hits the flat surface 321b, so that the pillar mounting bolt B2 is prevented from rotating. Therefore, the support 1 can be fixed to the base member 3 simply by screwing the nut onto the support mounting bolt B2 from the upper surface 3b side. When the head portion of the bolt is located on the enlarged portion 321a in this way, there is an advantage that the positioning of the cover 5 and the temporary fixing of the support column 1 are easy.

なお、本実施形態とは逆に、拡大部321aにナット(図1(b)(c)に示すナットN2に相当するナット)を配置しておき、支柱取付用ボルトB2を上方から取り付けるよう構成することもできる。このように拡大部321aにナットが位置するよう構成した場合、支柱1の下端プレート11上には支柱取付用ボルトB2の頭部だけが突き出すことになるから、支柱取付用ボルトB2の突き出し量が小さくなり美観に優れたものとできるメリットがある。 It should be noted that, contrary to the present embodiment, a nut (a nut corresponding to the nut N2 shown in FIGS. 1B and 1C) is arranged in the enlarged portion 321a, and the strut mounting bolt B2 is mounted from above. You can also do it. When the nut is configured to be located in the enlarged portion 321a in this manner, only the head of the pillar mounting bolt B2 projects above the lower end plate 11 of the pillar 1, so that the amount of projection of the pillar mounting bolt B2 is reduced. There is a merit that it can be made smaller and have an excellent appearance.

また図3に示すように、ベース部材3は、支柱1を固定するための支柱取付用ボルトB2の下方延長方向に、支柱取付用ボルトB2に当接可能であって、空間S(図4(c)参照)に面する蓋部材4を備えることもできる。この蓋部材4を設けた場合、支柱1を固定する前の状態の支柱取付用ボルトB2が下方の空間Sに脱落することを有効に防止できる。なお蓋部材4の他、例えばこの拡大部321aに、支柱取付用ボルトB2が支柱取付用ボルト孔321から脱落しないようにする脱落防止機構が設けられ、支柱取付用ボルトB2が脱落しないようにされていてもよい。 Further, as shown in FIG. 3, the base member 3 is capable of abutting on the pillar mounting bolt B2 in the downward extension direction of the pillar mounting bolt B2 for fixing the pillar 1, and the space S (see FIG. It is also possible to provide a lid member 4 facing c)). When the lid member 4 is provided, it is possible to effectively prevent the pillar mounting bolt B2 before the pillar 1 is fixed from dropping into the space S below. In addition to the lid member 4, for example, the enlarged portion 321a is provided with a drop-out prevention mechanism for preventing the pillar mounting bolts B2 from falling out of the pillar mounting bolt holes 321 to prevent the pillar mounting bolts B2 from falling off. May be.

支柱取付部32はアンカーボルト取付部31に対して後方(地覆Wの橋梁幅方向外側)に離れて位置している。このため、地覆Wと支柱1との間にベース部材3を設けることで支柱1を地覆Wからずらせて配置できる。このようにずらせて配置した分、幅の狭い地覆Wであっても、地覆上面に、地覆Wの延長方向に向かって2列以上(別の表現で表すと、橋梁幅方向の内外に少なくとも2列)となるように配置される複数(本実施形態では4本)のアンカーボルトB1を取り付ける十分なスペースが確保される。なお、前記「地覆Wの延長方向に向かって2列」とは、地覆Wの延長方向(左右方向)に向かう列が、橋梁幅方向(前後方向)に並ぶように2列存在するという意味である。また、前記「2列」には、各列が1本のアンカーボルトB1だけで構成される場合も含まれる。このため、幅の狭い地覆Wであっても、地覆Wの延長方向に向かって2列以上となるように配置される複数のアンカーボルトB1を用いて支柱1を固定できる。よって、複数のアンカーボルトB1により支柱1が十分な強度で固定される。 The column mounting portion 32 is positioned rearward (outer side in the bridge width direction of the ground covering W) with respect to the anchor bolt mounting portion 31. Therefore, by providing the base member 3 between the ground covering W and the pillar 1, the pillar 1 can be displaced from the ground covering W. Even if the ground cover W has a narrow width due to the displacement as described above, there are two or more rows on the top surface of the ground cover in the extension direction of the ground cover W (in other words, inside and outside in the bridge width direction). A sufficient space for attaching a plurality of (four in this embodiment) anchor bolts B1 arranged in at least two rows is secured. The "two rows extending in the extension direction of the ground cover W" means that there are two rows extending in the extension direction of the ground cover W (left-right direction) so as to be aligned in the bridge width direction (front-back direction). Is the meaning. The "two rows" also includes the case where each row is composed of only one anchor bolt B1. Therefore, even with the ground covering W having a narrow width, the pillar 1 can be fixed by using the plurality of anchor bolts B1 arranged in two or more rows in the extension direction of the ground covering W. Therefore, the column 1 is fixed with sufficient strength by the plurality of anchor bolts B1.

また、支柱取付用ボルトB2をアンカーボルトB1とは別に設けている。このため、支柱取付用ボルトB2ではベース部材3の変形荷重を負担できることが想定され、この想定を前提とすると、アンカーボルトB1では、橋梁用防護柵に車両が衝突した場合等に生じる引き抜き荷重を負担できるので、支柱取付用ボルトB2とアンカーボルトB1とで負担する荷重を分散できる。よって、アンカーボルトB1の負担すべき荷重が小さくなる分、アンカーボルトB1の地覆Wへの埋め込み深さを小さくできると考えられる。 Further, the pillar mounting bolt B2 is provided separately from the anchor bolt B1. For this reason, it is assumed that the pillar mounting bolt B2 can bear the deformation load of the base member 3, and assuming this assumption, the anchor bolt B1 can handle the pull-out load that occurs when a vehicle collides with the bridge protection fence. Since it can be borne, the load borne by the pillar mounting bolt B2 and the anchor bolt B1 can be dispersed. Therefore, it is considered that the embedding depth of the anchor bolt B1 into the ground cover W can be reduced by the amount that the load that the anchor bolt B1 must bear becomes smaller.

また、アンカーボルトB1と支柱取付用ボルトB2とが互いに干渉しない。よって、地覆Wへのベース部材3の固定と、ベース部材3への支柱1の固定とを別個の工程で行うことができるので、橋梁用防護柵の更新工事を効率良く行うことができる。 Further, the anchor bolt B1 and the pillar mounting bolt B2 do not interfere with each other. Therefore, the fixing of the base member 3 to the ground cover W and the fixing of the pillar 1 to the base member 3 can be performed in separate steps, so that the replacement work of the bridge protection fence can be efficiently performed.

なお、本実施形態とは異なり、アンカーボルト取付孔311の一部または全部を支柱取付用ボルト孔321が兼ねることもできる。この場合、アンカーボルトB1の一部または全部を、ベース部材3に対して支柱1を固定するために用いることができる。ただしこの場合では、後述する道路構造令の建築限界に適合させるため、例えば特別な形状の支柱1を用意することが必要になるため、本実施形態のようにアンカーボルト取付孔311と支柱取付用ボルト孔321とは別個に形成することが望ましい。 Note that unlike the present embodiment, part or all of the anchor bolt mounting hole 311 can also serve as the pillar mounting bolt hole 321. In this case, part or all of the anchor bolt B1 can be used to fix the support column 1 to the base member 3. However, in this case, in order to comply with the building limit of the Road Structure Ordinance to be described later, for example, it is necessary to prepare a pillar 1 having a special shape. Therefore, as in the present embodiment, the anchor bolt mounting hole 311 and the pillar mounting It is desirable to form it separately from the bolt hole 321.

ベース部材3における後方で、支柱取付部32よりも左右方向端寄りには吊り下げ孔33が形成されている。この吊り下げ孔33に吊りベルト等を通すことにより、重機等を用いてベース部材3を吊り下げることが容易にでき、地覆W上へのベース部材3の配置を容易に行うことができる。この吊り下げ孔33は作業員の持ち手として使用することもでき、その場合、手作業によるベース部材3の運搬が容易となる。また、図5(b)に示すように、ベース部材3で荷重負担に直接寄与しない、支柱取付用ボルト孔321の左右部分には、底面側に開口した肉盗み部34等が形成されており、ベース部材3の軽量化に貢献している。更に、肉盗み部34等の、空間を有する部分を形成することにより、断面係数(断面二次モーメント)を大きくできることから、ベース部材3の強度(剛性)を向上できる。 A suspension hole 33 is formed at the rear of the base member 3 and closer to the left-right direction end than the strut mounting portion 32. By passing the suspension belt or the like through the suspension hole 33, the base member 3 can be easily suspended by using a heavy machine or the like, and the base member 3 can be easily arranged on the ground cover W. The hanging hole 33 can also be used as a handle of a worker, in which case the base member 3 can be easily carried by hand. Further, as shown in FIG. 5(b), a meat scavenging portion 34 and the like opened to the bottom side are formed in the left and right portions of the pillar mounting bolt hole 321 that do not directly contribute to the load bearing by the base member 3. Contributes to weight reduction of the base member 3. Furthermore, since the section modulus (second moment of area) can be increased by forming the space-containing portion such as the meat-thief portion 34, the strength (rigidity) of the base member 3 can be improved.

ベース部材3は、図2及び図4(a)〜(c)に示すように地覆Wに取り付けられた状態で、図示のように前端が地覆W上に位置し、後端が地覆Wよりも後方(橋梁幅方向外側方向)に張り出す。この状態で取り付けられた支柱1は、地覆Wに対して後方(橋梁幅方向外側方向)にオフセットされた状態となるため、幅の狭い地覆Wであっても、後述する道路構造令の建築限界に適合させることができる。 In the state where the base member 3 is attached to the ground cover W as shown in FIGS. 2 and 4A to 4C, the front end is located on the ground cover W and the rear end is covered with the ground cover W as illustrated. Overhang behind W (outward in the bridge width direction). Since the support column 1 attached in this state is in a state of being offset rearward (outward in the width direction of the bridge) with respect to the ground cover W, even if the ground cover W has a narrow width, the structure of roads will be described later. Can be adapted to building limits.

ベース部材3の、地覆Wに対する橋梁幅方向外側への前記張り出しは、図4(c)に示すように、ベース部材3の底面3aと地覆Wの橋梁幅方向における外面(橋梁上の道路に面する側とは反対側の面、または河川側の面、または後面)W3との間に空間Sを有するようになされる。このように構成することで、ベース部材3に橋梁幅方向外側へ倒れ込む外力がかかった場合でも、この外力が地覆Wの橋梁幅方向における外面W3に伝わることがなく、外力が外面W3に伝わることが原因で地覆Wを構成するコンクリートが破壊されるということを抑制できる。 The protrusion of the base member 3 to the outside in the bridge width direction with respect to the ground cover W is, as shown in FIG. 4C, the bottom surface 3a of the base member 3 and the outer surface of the ground cover W in the bridge width direction (the road on the bridge). The surface S on the side opposite to the side facing, or the surface on the river side, or the rear surface) W3 has a space S. With this configuration, even when an external force is applied to the base member 3 to fall outward in the bridge width direction, this external force is not transmitted to the outer surface W3 of the ground cover W in the bridge width direction, and the external force is transmitted to the outer surface W3. It is possible to prevent the concrete constituting the ground cover W from being destroyed due to this.

支柱1及び横梁2は、従来用いられていたものと同構造のものを使用できる。支柱1の下端には下端プレート11が設けられている。この下端プレート11とベース部材3を固定部材で締結する。このため、下端プレート11にはボルト貫通孔111が形成されている(図4(c)、図8(d)参照)。なお、本実施形態では、この固定部材として支柱取付用ボルトB2及びナットが用いられているが、その他の締結手段を用いることもできる。また、本実施形態では、支柱取付用ボルトB2として六角ボルトが用いられているが、六角ボルト以外のボルトを用いることもできる。また、場合によっては(具体的にはベース部材3として溶接可能な素材で形成した場合)、下端プレート11をベース部材3に対して溶接することもできる。横梁2は、図4(c)に示すように、支柱1の前方に形成された凹部に取り付けられ、図1(a)に示すように、地覆Wの延長方向に沿って位置する。 As the pillar 1 and the lateral beam 2, those having the same structure as those conventionally used can be used. A lower end plate 11 is provided at the lower end of the column 1. The lower end plate 11 and the base member 3 are fastened with a fixing member. For this reason, the bolt through hole 111 is formed in the lower end plate 11 (see FIGS. 4C and 8D). In this embodiment, the pillar mounting bolt B2 and the nut are used as the fixing member, but other fastening means may be used. Further, in the present embodiment, the hexagonal bolt is used as the pillar mounting bolt B2, but a bolt other than the hexagonal bolt may be used. In some cases (specifically, when the base member 3 is made of a weldable material), the lower end plate 11 can be welded to the base member 3. As shown in FIG. 4C, the cross beam 2 is attached to a recess formed in front of the support column 1 and is located along the extension direction of the ground cover W as shown in FIG. 1A.

なお、支柱1とベース部材3とを一体に構成することも可能であり、この構成では、ベース部材3に支柱1を固定する手間が省けるというメリットがある。ただ、この構成では支柱1とベース部材3との結合体の重量が各々の重量よりも大きくなり、場合によっては重機が必要となること、及び、地覆Wに対する支柱1の位置調整がしにくくなるというデメリットがある。更に、支柱1とベース部材3とを一体に構成した場合、例えば支柱1とベース部材3の一方だけが損傷した場合であっても全部を交換しないとならないが、別体で構成しておけば損傷した部分だけを交換できる。これらにより、支柱1とベース部材3とは別体で構成することが望ましい。 In addition, it is possible to integrally form the support column 1 and the base member 3, and this configuration has an advantage that the labor for fixing the support column 1 to the base member 3 can be omitted. However, in this configuration, the weight of the combined body of the column 1 and the base member 3 is larger than each weight, and in some cases heavy equipment is required, and it is difficult to adjust the position of the column 1 with respect to the ground cover W. There is a disadvantage that Further, when the support 1 and the base member 3 are integrally formed, for example, even if only one of the support 1 and the base member 3 is damaged, it is necessary to replace all of them, but if they are configured separately. Only damaged parts can be replaced. For these reasons, it is desirable that the support column 1 and the base member 3 be configured separately.

ここで、道路構造令(政令)において道路の建築限界が定められている。これによると、車道の外端、つまり、地覆Wの内面から構造物を250mm以上離すことが要求されている。 Here, the road construction limit is specified in the Road Structure Ordinance (Government Ordinance). According to this, it is required to separate the structure from the outer end of the road, that is, the inner surface of the ground cover W by 250 mm or more.

地覆Wに対してアンカーボルトを設置する場合、地覆W内部の鉄筋、特にフープ筋に囲まれた領域にアンカーボルトB1を配置しないと十分な引き抜き強度を発揮できない。一方、この領域にアンカーボルトを配置しつつ建築限界に適合させることは、特に幅の狭い地覆Wでは難しかった。 When the anchor bolt is installed on the ground covering W, sufficient pull-out strength cannot be exhibited unless the anchor bolt B1 is arranged in a region surrounded by the reinforcing bars inside the ground covering W, particularly the hoop reinforcement. On the other hand, it was difficult to adapt the construction limit while arranging the anchor bolts in this area, especially in the ground cover W having a narrow width.

本実施形態では、ベース部材3により支柱1を後方(橋梁幅方向外側方向)にオフセットできるため、地覆Wの内面から、横梁2のうちで最も道路に近い位置までの水平距離X(図4(c)参照)を250mm以上とできる。このため、容易に道路構造令の要求を満たすことができる。本実施形態では、図4(c)に示すように4本のアンカーボルトB1全てが水平距離Xの範囲内に位置している。ただしこれに限定されず、例えば前方に位置するアンカーボルトB1等、複数のアンカーボルトのうち少なくとも一部のみが水平距離Xの範囲内に位置するよう構成されることもできる。以上、支柱1が後方にオフセットされるため、幅の狭い地覆Wを有する橋梁における防護柵の更新を促進できる。また、ベース部材3を用いることにより、支柱1及び横梁2については、建築限界を満たすための特殊な形状のものを用いずに、従来用いられていた形状のものがそのまま使用できる。 In this embodiment, since the pillar 1 can be offset rearward (outward in the bridge width direction) by the base member 3, the horizontal distance X from the inner surface of the ground cover W to the position of the horizontal beam 2 that is closest to the road (see FIG. 4). (See (c)) can be 250 mm or more. Therefore, it is possible to easily meet the requirements of the Road Structure Ordinance. In this embodiment, as shown in FIG. 4C, all four anchor bolts B1 are located within the range of the horizontal distance X. However, the present invention is not limited to this, and for example, at least a part of the plurality of anchor bolts such as the anchor bolt B1 located at the front may be configured to be located within the range of the horizontal distance X. As described above, since the pillar 1 is offset rearward, the renewal of the protective fence in the bridge having the narrow ground covering W can be promoted. Further, by using the base member 3, the pillar 1 and the lateral beam 2 can be used as they are, without any special shape for satisfying the construction limit.

本実施形態のアンカーボルトB1は、支柱1の1本当たりで4本が用いられる。なお、3本または5本以上が用いられることもできる。従来のようにアンカーボルトB1の1本当たりの地覆Wへの埋め込み長さを大きくしなくても、本数が多い分、アンカーボルトB1の1本当たりの負担荷重が小さくなるので、相対的に小さい埋め込み長さで十分な引き抜き強度を確保できる。アンカーボルトB1には、ケミカルアンカー等の後施工アンカーを用いることができる。 Four anchor bolts B1 of this embodiment are used for each pillar 1. Incidentally, three or five or more can be used. Even if the embedding length per anchor bolt B1 into the ground cover W is not increased as in the conventional case, since the number of anchor bolts B1 is large, the burden load per anchor bolt B1 is small. Sufficient pull-out strength can be secured with a small embedding length. A post-installed anchor such as a chemical anchor can be used for the anchor bolt B1.

次に、車両乗り上げ抑制構造を構成するカバー5及び乗り上げ抑制部材6に関して説明する。本実施形態では、ベース部材3を覆うようにカバー5が取り付けられる(図2及び図4においては、カバー5及び乗り上げ抑制部材6を二点鎖線で表示している)。このカバー5は、図1(c)に示すように、例えば鋼板等の板状体が略コの字状に曲げ成形されて形成され、地覆Wへの設置状態で地覆Wの上面に対して平行に配置される天部51、天部51の前端から下方に延びる前縁部52、天部51の後端から下方に延びる後縁部53を備える。前縁部52は地覆Wの前面W1と略同一平面となる位置に配置される。なお、前記「略同一平面となる位置」とは、車道側から見た場合、この構成において前縁部52と地覆Wの前面W1との間で段差が明瞭に視認されない程度の位置関係である。なお、カバー5が板状体からなる場合には、乗り上げ抑制部材6の幅寸法に比べてカバー5の厚さ寸法がほとんど無視できるので、乗り上げ抑制部材6の前面(より詳しくは一方側中空部62の前面)もまた、地覆Wの前面W1と略同一平面となる位置に配置されることとなる。 Next, the cover 5 and the riding restraining member 6 which constitute the vehicle riding restraining structure will be described. In the present embodiment, the cover 5 is attached so as to cover the base member 3 (in FIGS. 2 and 4, the cover 5 and the riding restraint member 6 are indicated by a chain double-dashed line). As shown in FIG. 1( c ), the cover 5 is formed by bending a plate-shaped body such as a steel plate into a substantially U-shape, and is formed on the upper surface of the ground covering W when installed on the ground covering W. A top part 51 arranged in parallel to the top part 51, a front edge part 52 extending downward from a front end of the top part 51, and a rear edge part 53 extending downward from a rear end of the top part 51 are provided. The front edge portion 52 is arranged at a position substantially flush with the front surface W1 of the ground covering W. In addition, the above-mentioned "position on substantially the same plane" means a positional relationship such that a step is not clearly visible between the front edge portion 52 and the front surface W1 of the ground cover W when viewed from the road side. is there. When the cover 5 is formed of a plate-shaped member, the thickness dimension of the cover 5 can be almost ignored compared to the width dimension of the ride-in restraining member 6, and therefore the front surface of the ride-in restraining member 6 (more specifically, the hollow portion on one side). The front surface 62) is also arranged at a position substantially flush with the front surface W1 of the ground covering W.

カバー5または乗り上げ抑制部材6を、前記略同一平面となる配置とすることにより、車両乗り上げ抑制構造と地覆Wとを外観上一体化できるため、美観を向上できる。また、カバー5または乗り上げ抑制部材6と地覆Wの前面W1との間に塵埃や土砂がたまりにくくできる。また、カバー5または乗り上げ抑制部材6と地覆Wの前面W1との間に、車道を逸脱しつつある車両の一部が引っ掛かって、カバー5または乗り上げ抑制部材6を損傷してしまうことも抑制できる。 By arranging the cover 5 or the ride-on restraint member 6 so as to be substantially in the same plane, the vehicle ride-on restraint structure and the ground cover W can be integrated in appearance, so that the appearance can be improved. Further, it is possible to prevent dust and earth from accumulating between the cover 5 or the riding restraining member 6 and the front surface W1 of the ground cover W. Further, it is also possible to prevent a part of the vehicle deviating from the roadway from being caught between the cover 5 or the riding restraining member 6 and the front surface W1 of the ground cover W and damaging the cover 5 or the riding restraining member 6. it can.

カバー5における前縁部52の下端は、地覆Wの上面よりも下方に位置している。このため、この前縁部52は乗り上げ抑制部材6の前面を覆うことができる。また、地覆Wの上前隅部に形成されることがある面取り部W2の少なくとも一部を隠すことができる。後縁部53はベース部材3の後端と略一致する位置に配置される。このため、カバー5は、図1(c)に示すように地覆Wから後方に張り出した形状とされている。この後方に張り出した部分は、図1(b)に示すように、ベース部材3の地覆Wに対する張り出しに対応している。 The lower end of the front edge portion 52 of the cover 5 is located below the upper surface of the ground covering W. Therefore, the front edge portion 52 can cover the front surface of the riding restraining member 6. In addition, at least a part of the chamfered portion W2 that may be formed at the upper front corner of the cloth W can be hidden. The rear edge portion 53 is arranged at a position that substantially coincides with the rear end of the base member 3. Therefore, the cover 5 has a shape protruding rearward from the ground cover W as shown in FIG. This rearwardly projecting portion corresponds to the projecting portion of the base member 3 with respect to the ground cover W, as shown in FIG.

なお、本実施形態の乗り上げ抑制部材6は、図1(c)に示すように、地覆Wへ固定された状態における上前隅部及び上後隅部が面取りされているため、乗り上げ抑制部材6に内面が当接するカバー5も上前隅部が面取りされている。ただし、前記面取りは本発明では必須でなく、乗り上げ抑制部材6及びカバー5の上前隅部を直角形状とすることもできる。 As shown in FIG. 1(c), the riding restraining member 6 of the present embodiment has chamfered upper front corners and upper rear corners in a state of being fixed to the ground cover W, so that the riding restraining member 6 The upper front corner of the cover 5 whose inner surface abuts 6 is also chamfered. However, the chamfering is not essential in the present invention, and the riding-up restraining member 6 and the upper front corner of the cover 5 may be formed in a right angle shape.

カバー5は、図1(a)(b)に示すように、ベース部材3及び地覆Wの上部を覆う全体カバーとして実施することができる。なお、ベース部材3のみを覆うようにしたり、ベース部材3同士の間のみを覆う部分カバーとして実施したりできる。カバー5の取り付けは種々の手段により行うことができる。例えば、ベース部材3への嵌合、ボルト止め、地覆W上に設置したレールへの固定等で行うことができる。なお、カバー5の素材はこれに限定されず、例えばアルミニウム合金や合成樹脂等、種々の素材で形成できる。複数枚のカバー5を地覆Wの長手方向に沿って並べることで、種々の長さの地覆Wに対応させることができる。前記複数枚のカバー5のうちで、地覆Wの長手方向における両端に位置するカバー5には、天部51、前縁部52、後縁部53を連結する側板(図示しない)を設けておき、天部51、前縁部52、後縁部53により形成される空間を隠すこともできる。後述のように中空の長尺状体である、乗り上げ抑制部材6の長手方向端部を、この側板により覆うことができるので、乗り上げ抑制部材6の中空部分に塵埃や水分が入り込むことで乗り上げ抑制部材6が腐食するようなことを抑制できる。また、カバー5の内部が見えなくなるため、美観に優れたものとできる。更に、前記複数枚のカバー5同士の接続部分には目隠し板を設けておき、隙間ができないようにすることもできる。 As shown in FIGS. 1A and 1B, the cover 5 can be implemented as an entire cover that covers the upper portions of the base member 3 and the ground cover W. It should be noted that it is possible to cover only the base member 3 or to implement it as a partial cover that covers only between the base members 3. The cover 5 can be attached by various means. For example, fitting to the base member 3, bolting, fixing to a rail installed on the ground covering W, or the like can be performed. The material of the cover 5 is not limited to this, and can be formed of various materials such as aluminum alloy and synthetic resin. By arranging a plurality of covers 5 along the longitudinal direction of the ground covering W, it is possible to correspond to the ground covering W of various lengths. Of the plurality of covers 5, the covers 5 located at both ends in the longitudinal direction of the ground cover W are provided with side plates (not shown) that connect the top portion 51, the front edge portion 52, and the rear edge portion 53. Alternatively, the space formed by the top portion 51, the front edge portion 52, and the rear edge portion 53 can be hidden. As will be described later, since the end portion in the longitudinal direction of the riding restraining member 6, which is a hollow elongated body, can be covered with this side plate, dust and water enter the hollow portion of the riding restraining member 6 to restrain riding. It can suppress that the member 6 corrodes. Further, since the inside of the cover 5 is not visible, it can be made to have an excellent appearance. Further, a blind plate may be provided at a connecting portion between the plurality of covers 5 to prevent a gap.

カバー5と地覆Wとの間には、乗り上げ抑制部材6が配置される。この乗り上げ抑制部材6は地覆W上に、ベース部材3同士の間でベース部材3に重ならないように設けられている。図7(a)(b)に示すように、本実施形態の乗り上げ抑制部材6はアルミニウム合金等の金属押し出し材から構成された、横断面が中空の長尺状体である。中空に形成することで、乗り上げ抑制部材6の強度を保ちつつ軽量化できる。このため乗り上げ抑制部材6を軽量に構成できるから、橋梁にかかる重量負担の増加を避けつつ地覆Wの位置において車両が乗り越えるべき高さを高くできる。なお、乗り上げ抑制部材6は押し出しに限定されず、曲げやプレスにより形成することもできる。また、例えば角型鋼管のような異形管を用いることもできる。特に汎用性の高い材料である角型鋼管を用いることにより、乗り上げ抑制部材6の製造コスト低減が期待できる。また、合成樹脂、炭素繊維、FRPで形成することもできる。 The riding restraining member 6 is disposed between the cover 5 and the ground cover W. The riding restraining member 6 is provided on the ground cover W so as not to overlap the base member 3 between the base members 3. As shown in FIGS. 7A and 7B, the riding restraining member 6 of the present embodiment is a long body having a hollow cross section and made of a metal extruded material such as an aluminum alloy. By forming it in the hollow shape, it is possible to reduce the weight while maintaining the strength of the riding restraining member 6. For this reason, the ride-on restraint member 6 can be configured to be lightweight, so that the height at which the vehicle can get over at the position of the ground cover W can be increased while avoiding an increase in the weight burden on the bridge. Note that the riding restraining member 6 is not limited to extrusion, and may be formed by bending or pressing. Alternatively, a deformed pipe such as a square steel pipe may be used. By using a square steel tube, which is a material with high versatility, a reduction in the manufacturing cost of the riding restraining member 6 can be expected. It can also be made of synthetic resin, carbon fiber, or FRP.

乗り上げ抑制部材6は、底板61と、底板61上に形成された一方側中空部62、及び、底板61上に、前記一方側中空部62から幅方向に離れて設けられた他方側中空部63を備える。一方側中空部62と他方側中空部63とは、アンカーボルトB3及びナットN3の配置及び締結作業に支障が生じない距離だけ離されている。また、一方側中空部62と他方側中空部63の高さ寸法は同一である。本実施形態では、図7(b)に示すように、一方側中空部62と他方側中空部63とは異なる側面形状(または横断面形状)であって、乗り上げ抑制部材6が前後非対称の形状とされている。ただし、前後対称の形状とすることもできる。 The riding restraining member 6 includes a bottom plate 61, a hollow portion 62 on one side formed on the bottom plate 61, and a hollow portion 63 on the other side provided on the bottom plate 61 in a width direction from the hollow portion 62 on one side. Equipped with. The one side hollow portion 62 and the other side hollow portion 63 are separated by a distance that does not hinder the arrangement and fastening work of the anchor bolt B3 and the nut N3. The height dimension of the one side hollow portion 62 and the other side hollow portion 63 is the same. In the present embodiment, as shown in FIG. 7B, the one-side hollow portion 62 and the other-side hollow portion 63 have different side shapes (or cross-sectional shapes), and the ride-in suppressing member 6 has a front-rear asymmetric shape. It is said that. However, the shape may be symmetrical with respect to the front-rear direction.

底板61にはアンカーボルト取付孔611が貫通している。アンカーボルト取付孔611は、左右方向に長い長孔、つまり、地覆Wへの設置時において地覆Wの延長方向(左右方向)に沿って延びる長孔とされている。ただし、アンカーボルト取付孔611の形状はこれに限定されるものではない。一方側中空部62及び他方側中空部63は、各部の設けられた底板61も含めた横断面形状が多角形、具体的には略長方形とされている。そして、他方側中空部63の板厚に比べて、一方側中空部62の板厚は大きく形成されている。 Anchor bolt attachment holes 611 penetrate the bottom plate 61. The anchor bolt attachment hole 611 is a long hole that is long in the left-right direction, that is, a long hole that extends along the extension direction (the left-right direction) of the ground cover W when it is installed on the ground cover W. However, the shape of the anchor bolt mounting hole 611 is not limited to this. Each of the one-side hollow portion 62 and the other-side hollow portion 63 has a polygonal cross-sectional shape including the bottom plate 61 provided with each portion, specifically, a substantially rectangular shape. The plate thickness of the one-side hollow portion 62 is larger than the plate thickness of the other-side hollow portion 63.

本実施形態では、地覆Wの幅方向に複数本の乗り上げ抑制部材6が配置される。具体的には地覆W上に2本の乗り上げ抑制部材6が並列される。この際、一方側中空部62は地覆Wの上面における前方側及び後方側に配置され、他方側中空部63は地覆Wの上面における中央側に配置される。乗り上げ抑制部材6の高さ寸法は、ベース部材3の高さ寸法と略同一とされている。このように、地覆Wの幅方向に複数本を配置できるように乗り上げ抑制部材6を構成することにより、地覆Wの幅方向における乗り上げ抑制部材6の配置間隔が可変となる。 In the present embodiment, a plurality of riding restraining members 6 are arranged in the width direction of the ground covering W. Specifically, the two riding restraining members 6 are juxtaposed on the ground cover W. At this time, the one side hollow portion 62 is arranged on the front side and the rear side on the upper surface of the ground covering W, and the other side hollow portion 63 is arranged on the center side on the upper surface of the ground covering W. The height dimension of the riding restraining member 6 is substantially the same as the height dimension of the base member 3. As described above, by configuring the riding restraining member 6 so that a plurality of riding restraining members 6 can be arranged in the width direction of the ground covering W, the arrangement interval of the riding restraining members 6 in the width direction of the ground covering W becomes variable.

一定幅の乗り上げ抑制部材6を用意しておけば、乗り上げ抑制部材6の位置及び並列させる数量を調整して種々の幅寸法の地覆Wに適用できるため、汎用性に優れる。つまり、複数の乗り上げ抑制部材6を、地覆Wの幅寸法に合わせて距離可変で配置できるので、複数(本実施形態では2本)の乗り上げ抑制部材6の間隔を図1(b)(c)に示すように0(乗り上げ抑制部材6同士が当接した状態)とすることもできるし、適宜の間隔で空けることもできる。よって、種々の幅寸法の地覆Wに対応できる。このため既設の地覆Wに対して容易に車両乗り上げ抑制構造を付加できる。図1(c)に示すように、乗り上げ抑制部材6はアンカーボルト取付孔611を貫通するアンカーボルトB3により地覆Wに固定される。これにより、地覆Wの上面に対し、乗り上げ抑制部材6の下面6dが少なくとも車道側に固定され、乗り上げ抑制部材6の上面6uが当該地覆Wの上面よりも高い位置とされる。そして、ねじ止め等により乗り上げ抑制部材6にカバー5が固定される。前記ねじ止めは、乗り上げ抑制部材6に対してカバー5を直接的に固定する専用のねじによって行ってもよいし、カバー5をベース部材3の上面3bと支柱1の下端プレート11の間に配置させた状態として、カバー5を貫通する支柱取付用ボルトB2とそれにねじ込まれるナットN2とによって行ってもよい。特に、カバー5がベース部材3と支柱1の下端プレート11とに挟まれる場合、車両衝突時などにカバー5が飛散しにくくなるメリットがある。また、カバー5は一方側中空部62及び他方側中空部63の上面に配置されるため、一方側中空部62と他方側中空部63との間に位置するアンカーボルトB3の地覆Wから突出した部分及びアンカーボルトB3に取り付けられたナットN3は、カバー5により視認できないようになる。このため、カバー5の設置により車両乗り上げ抑制構造の美観を向上できる。 If the ride-in restraining member 6 having a constant width is prepared, the position and the number of the ride-in restraining members 6 to be arranged can be adjusted and applied to the ground covering W having various width dimensions, which is excellent in versatility. That is, since a plurality of ride-on restraint members 6 can be arranged in a variable distance according to the width dimension of the ground cover W, the distance between the plurality (two in the present embodiment) of the ride-on restraint members 6 is set as shown in FIG. It is possible to set it to 0 (a state where the ride-on restraining members 6 are in contact with each other) as shown in ), or to leave them at appropriate intervals. Therefore, it is possible to cope with the ground covering W having various width dimensions. Therefore, the vehicle running restraining structure can be easily added to the existing ground cover W. As shown in FIG. 1C, the riding restraining member 6 is fixed to the ground cover W by an anchor bolt B3 penetrating the anchor bolt mounting hole 611. As a result, the lower surface 6d of the riding restraining member 6 is fixed to at least the roadway side with respect to the upper surface of the ground covering W, and the upper surface 6u of the riding restraining member 6 is positioned higher than the upper surface of the ground covering W. Then, the cover 5 is fixed to the riding restraining member 6 by screwing or the like. The screwing may be performed by a dedicated screw for directly fixing the cover 5 to the ride-in suppressing member 6, or the cover 5 may be arranged between the upper surface 3b of the base member 3 and the lower end plate 11 of the column 1. In this state, the support mounting bolt B2 penetrating the cover 5 and the nut N2 screwed into the support mounting bolt B2 may be used. In particular, when the cover 5 is sandwiched between the base member 3 and the lower end plate 11 of the support column 1, there is an advantage that the cover 5 is less likely to scatter in the event of a vehicle collision. Further, since the cover 5 is arranged on the upper surfaces of the one-side hollow portion 62 and the other-side hollow portion 63, the cover 5 projects from the ground cover W of the anchor bolt B3 located between the one-side hollow portion 62 and the other-side hollow portion 63. The covered portion and the nut N3 attached to the anchor bolt B3 become invisible due to the cover 5. Therefore, by installing the cover 5, it is possible to improve the aesthetic appearance of the vehicle riding restraint structure.

また、本実施形態の乗り上げ抑制部材6では、一方側中空部62と他方側中空部63とに挟まれた部分における底板61にアンカーボルト取付孔611が設けられている。このため、アンカーボルトB3の地覆Wから突出した部分及びナットN3は、一方側中空部62と他方側中空部63とに挟まれた凹部に入り込んだ形となるから、一方側中空部62及び他方側中空部63の上端よりも下方に位置させることができ、視認しにくい状態となる。また、乗り上げ抑制部材6として例えば角型鋼管を用いた場合、当該鋼管の内部にアンカーボルトB3の地覆Wから突出した部分及びナットN3を位置させることができ、視認しにくい状態となる。このように、カバー5を設置せず乗り上げ抑制部材6を単独で設置する場合であっても、車両乗り上げ抑制構造の美観が損なわれることを抑制できる。なお、前記凹部に別部材を嵌め込むことで、アンカーボルトB3の地覆Wから突出した部分及びナットN3を視認できないよう隠すことも可能である。 Further, in the riding restraint member 6 of the present embodiment, the anchor bolt mounting hole 611 is provided in the bottom plate 61 in the portion sandwiched by the one side hollow portion 62 and the other side hollow portion 63. Therefore, the portion of the anchor bolt B3 that protrudes from the ground cover W and the nut N3 are in a shape that is inserted into the concave portion sandwiched between the one-side hollow portion 62 and the other-side hollow portion 63, so that the one-side hollow portion 62 and It can be positioned below the upper end of the other side hollow portion 63, which makes it difficult to visually recognize. Further, when a rectangular steel pipe is used as the riding suppression member 6, a portion of the anchor bolt B3 protruding from the ground cover W and the nut N3 can be located inside the steel pipe, which makes it difficult to visually recognize. As described above, even when the ride-on restraint member 6 is installed alone without installing the cover 5, it is possible to prevent the appearance of the vehicle ride-on restraint structure from being impaired. It is also possible to hide the part of the anchor bolt B3 protruding from the ground cover W and the nut N3 so as not to be visible by fitting another member into the recess.

このように地覆Wの上面に乗り上げ抑制部材6が固定されることにより、地覆Wに衝突する車両が早い時点で接する部分である、地覆Wの上面の車道側に、地覆Wの上面よりも高い位置にある乗り上げ抑制部材6を備えることで、図1(a)(c)に示すように、乗り上げ抑制部材6の分(本実施形態では更にカバー5の厚み分も加わって)、地覆Wの位置において車両が乗り越えるべき高さを高くできる。このため、地覆Wの上端がかさ上げされたのと同じことになり、車道を逸脱しつつある車両が、前記高さが高くなった分、乗り越え難くなることから、当該車両が地覆Wを乗り越えてしまうことを抑制できる。これによって、防護柵が設けられていない橋梁ではそのままで、防護柵が設けられている橋梁では車両が防護柵を突き破ってしまったとき、車両が河川に落下してしまうことにより事故が拡大してしまうような事態を起こりにくくできる。 By fixing the riding restraint member 6 on the upper surface of the ground covering W in this manner, the ground covering W of the upper surface of the ground covering W, which is a portion with which the vehicle colliding with the ground covering W comes into contact at an early point, is located. By providing the riding restraining member 6 located at a position higher than the upper surface, as shown in FIGS. 1A and 1C, the riding restraining member 6 is added (in the present embodiment, the thickness of the cover 5 is further added). In the position of the ground cover W, it is possible to increase the height at which the vehicle should get over. For this reason, the upper end of the ground covering W is raised, and a vehicle that is deviating from the roadway is more difficult to get over because the height is higher. It is possible to suppress overcoming. As a result, accidents will spread due to the vehicle falling on the river when the vehicle breaks through the protective fence while it remains on the bridge without the protective fence. It is possible to make it difficult for the situation to happen

そして特に、本実施形態の乗り上げ抑制部材6では、他方側中空部63の板厚に比べ、一方側中空部62の板厚が大きく形成されている。このため、地覆Wの上面の車道側に一方側中空部62を配置しておくことにより、車道を逸脱しつつある車両から受ける圧力に有効に対抗でき、前記圧力により乗り上げ抑制部材6が破壊(押しつぶされる等)されることを抑制できる。 In particular, in the ride-on restraint member 6 of the present embodiment, the plate thickness of the hollow portion 62 on one side is larger than the plate thickness of the hollow portion 63 on the other side. Therefore, by disposing the one-side hollow portion 62 on the roadway side of the upper surface of the ground cover W, the pressure received from the vehicle deviating from the roadway can be effectively countered, and the ride-on restraint member 6 is destroyed by the pressure. It is possible to suppress being crushed.

また、カバー5を設けることにより、橋梁用防護柵の美観を向上でき、ベース部材3及びアンカーボルトB1に雨粒や車両が跳ね上げた水滴が直接かからないようにできることから腐食を抑制できる。また、乗り上げ抑制部材6によって車両が地覆Wを乗り越えてしまうことは抑制できたものの、車両がベース部材3上に乗り上げてしまった場合であっても、車両、ベース部材3、地覆Wのそれぞれが損傷することを抑制できる。特に、本実施形態のカバー5は全体カバーであって、カバー5の上面に凹凸を生じないようにできるため、もし車両がベース部材上に乗り上げた場合であっても、車両のタイヤがベース部材3の部分で引っ掛かることが起こりにくいので、車両を速やかに道路上に戻すよう誘導させることができる。また、特にカバー5が合成樹脂等の軽量材料で形成された場合には、仮に車両の衝突、または強風や河川の増水により地覆Wからカバー5が離脱しても、歩行者や他の構造物にカバー5が当たった際に生じる危険性を低減できる。 Further, by providing the cover 5, the appearance of the bridge protection fence can be improved, and it is possible to prevent raindrops and water droplets splashed by the vehicle from directly hitting the base member 3 and the anchor bolts B1, so that corrosion can be suppressed. Further, although the vehicle can be prevented from climbing over the ground cover W by the ride-in restraining member 6, even when the vehicle rides on the base member 3, the vehicle, the base member 3, and the ground cover W can be prevented. Each can be prevented from being damaged. In particular, the cover 5 of the present embodiment is the entire cover, and since it is possible to prevent the top surface of the cover 5 from becoming uneven, even if the vehicle rides on the base member, the tire of the vehicle is Since it is difficult for the vehicle to get caught at the portion 3, it is possible to promptly guide the vehicle to return to the road. Further, particularly when the cover 5 is made of a lightweight material such as a synthetic resin, even if the cover 5 is detached from the ground cover W due to a vehicle collision, a strong wind, or a rise in water in a river, pedestrians and other structures The risk that occurs when the cover 5 hits an object can be reduced.

そして、カバー5と地覆Wとの間に乗り上げ抑制部材6が配置されることで、乗り上げ抑制部材6がカバー5に対する「補強材」としても機能し、カバー5の強度を向上できる。このため、前述のように車両がベース部材上に乗り上げた場合でも、カバー5の損傷を抑制できる。 Since the riding restraining member 6 is disposed between the cover 5 and the ground cover W, the riding restraining member 6 also functions as a “reinforcing member” for the cover 5, and the strength of the cover 5 can be improved. Therefore, even if the vehicle rides on the base member as described above, damage to the cover 5 can be suppressed.

次に、本実施形態の橋梁用防護柵を用いた、橋梁用防護柵の設置工法の一例である、既設橋梁用防護柵の更新工法について説明する。ただし、施工順は以下の説明順に限定されるものではなく、順序を適宜前後させることもできる。まず、地覆Wから既設橋梁用防護柵の支柱及び横梁を除去する。次に、地覆Wに埋め込まれていた既設アンカーボルトのうち、少なくとも地覆Wの上面から突出した部分を除去する。また必要により、地覆Wの表面等の補修を行う。次に、図8(a)に示すように、地覆Wに4本の新たなアンカーボルトB1を埋め込む。次に、図8(b)に示すように、支柱取付用ボルト孔321の下方から支柱取付用ボルトB2を通した状態としたベース部材3を地覆W上に位置させ、図8(c)に示すように、ベース部材3のアンカーボルト取付孔311にアンカーボルトB1を通してナットN1をねじ込む(本締めする)。その後、図8には示していないが、地覆Wの延長方向に並ぶベース部材3,3同士の間に、乗り上げ抑制部材6をアンカーボルトB3により固定する(図1(b)(c)参照、図8では乗り上げ抑制部材6を図示していない)。 Next, a method of renewing an existing bridge protective fence, which is an example of a method for installing a bridge protective fence using the bridge protective fence of the present embodiment, will be described. However, the construction order is not limited to the following description order, and the order may be appropriately changed. First, the columns and cross beams of the existing protective fence for bridge are removed from the ground cover W. Next, of the existing anchor bolts embedded in the ground covering W, at least a portion protruding from the upper surface of the ground covering W is removed. If necessary, the surface of the ground cover W is repaired. Next, as shown in FIG. 8A, four new anchor bolts B1 are embedded in the ground covering W. Next, as shown in FIG. 8( b ), the base member 3 in a state in which the support mounting bolt B 2 is inserted from below the support mounting bolt hole 321 is positioned on the ground cover W, and FIG. As shown in, the nut N1 is screwed (finally tightened) through the anchor bolt B1 into the anchor bolt mounting hole 311 of the base member 3. After that, although not shown in FIG. 8, the riding restraining member 6 is fixed by the anchor bolts B3 between the base members 3, 3 arranged in the extension direction of the ground cover W (see FIGS. 1B and 1C). , The riding restraint member 6 is not shown in FIG. 8).

次に、ベース部材3上にカバー5を置いた状態として(図1(b)参照、図8ではカバー5を図示していない)、図8(d)に示すように、支柱1をカバー5が置かれた状態となっているベース部材3の支柱取付部32上に位置させる。これによりカバー5は、ベース部材3の上面3bと支柱1の下端プレート11とに挟まれた状態となる。そして、図8(e)に示すように、支柱1における下端プレート11のボルト貫通孔111を貫通した支柱取付用ボルトB2に対してナットN2をねじ込む。なお、ナットN2はこの段階では仮止め状態としておく。次に、図8(f)に示すように、支柱1に横梁2を取り付ける。その後、各部の位置関係を調整し、支柱取付用ボルトB2にねじ込まれたナットN2と、横梁2の取付用のボルト・ナットを本締めして完成する。 Next, with the cover 5 placed on the base member 3 (see FIG. 1B, the cover 5 is not shown in FIG. 8), as shown in FIG. Is placed on the column mounting portion 32 of the base member 3 in the state of being placed. As a result, the cover 5 is sandwiched between the upper surface 3b of the base member 3 and the lower end plate 11 of the column 1. Then, as shown in FIG. 8E, the nut N2 is screwed into the pillar mounting bolt B2 penetrating the bolt through hole 111 of the lower end plate 11 of the pillar 1. The nut N2 is temporarily fixed at this stage. Next, as shown in FIG. 8F, the cross beam 2 is attached to the column 1. Then, the positional relationship of each part is adjusted, and the nut N2 screwed into the pillar mounting bolt B2 and the bolt/nut for mounting the cross beam 2 are finally tightened to complete the process.

以上、本実施形態では、ベース部材3が地覆Wを後方(橋梁幅方向外側方向)に延長するアタッチメントである「地覆延長部材」として作用する。このため、幅の狭い地覆Wであっても、地覆Wの延長方向に向かって2列以上となるように配置される複数(本実施形態では4本)のアンカーボルトB1で支柱1を支持できる。しかも建築限界も確保できる。このため、強度を確保しつつ安全性が高い。また、地覆Wを再構築する必要がない。また、地覆W上だけで既設橋梁用防護柵の更新工法の作業を完結できる(橋梁上だけで施工可能である)ため、河川上である橋梁の後方(外方)に仮設足場を設置する必要がなく、工期の短縮及び工事施工コストの低減が可能である。また、更新工法を実施するための各部材を、作業員が人力で持ち運ぶことのできるように構成できるため、重機を使う必要がなく、工事施工コストを低減できる。 As described above, in the present embodiment, the base member 3 functions as a “ground cover extension member” that is an attachment that extends the ground cover W rearward (outward in the bridge width direction). Therefore, even if the ground cover W has a narrow width, the support column 1 is fixed by a plurality (four in this embodiment) of anchor bolts B1 arranged in two or more rows in the extension direction of the ground cover W. Can support. Moreover, the building limit can be secured. Therefore, the safety is high while ensuring the strength. Moreover, it is not necessary to reconstruct the ground cover W. Moreover, since the work of the renewal method of the existing fence for bridge can be completed only on the ground cover W (it can be constructed only on the bridge), a temporary scaffold is installed behind the bridge on the river (outside). There is no need, and it is possible to shorten the construction period and the construction cost. Further, since each member for carrying out the renewal method can be configured so that a worker can manually carry it, it is not necessary to use a heavy machine, and the construction cost can be reduced.

なお、本実施形態の工法は、ここまで説明してきた既設橋梁用防護柵の更新だけに限定されず、例えば橋梁用防護柵の設けられていなかった地覆Wに対し、新たに橋梁用防護柵を設ける際に適用することもできる。更には、新設した地覆Wに対してこの工法を適用することもできる。 The construction method of the present embodiment is not limited to the updating of the existing protective fences for bridges described above. For example, a new protective fence for bridges is added to the ground cover W where the protective fence for bridges was not provided. It can also be applied when providing. Furthermore, this construction method can also be applied to the newly installed ground cover W.

以上、本発明の実施形態について説明したが、本発明は前記の各実施形態に限定されるものではなく、本発明の要旨を逸脱しない範囲内において種々の変更を加えることができる。 Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the present invention.

前記実施形態では、車両乗り上げ抑制構造を構成するカバー5及び乗り上げ抑制部材6と共に、橋梁用防護柵を地覆Wに設ける場合について説明したが、橋梁用防護柵を設けず、カバー5及び乗り上げ抑制部材6だけを地覆Wに設け、車両乗り上げ抑制構造のみを形成することもできる。 In the above embodiment, the case where the bridge protection fence is provided on the ground cover W together with the cover 5 and the ride suppression member 6 that constitute the vehicle climbing restraint structure has been described, but the bridge 5 and the climbing restraint are not provided. It is also possible to provide only the member 6 on the ground cover W and form only the vehicle riding restraint structure.

また前記実施形態の車両乗り上げ抑制構造は、カバー5及び乗り上げ抑制部材6から構成されていたが、カバー5を設けずに、乗り上げ抑制部材としての乗り上げ抑制部材6のみから構成されることもできる。この構成における乗り上げ抑制部材6は、カバー5の強度を補強するための「補強材」としての機能はなく、純粋に乗り上げ抑制部材として機能することになる。この場合、乗り上げ抑制部材6の前面(より詳しくは一方側中空部62の前面)は、地覆Wの前面W1と略同一平面となる位置に配置されることができる。なお、地覆Wの上前隅部に面取り部W2が形成される場合には、面取り部W2の上縁に乗り上げ抑制部材6の前面を略一致させることもできる。 Further, the vehicle ride-on restraint structure of the above-described embodiment is composed of the cover 5 and the ride-on restraint member 6, but it is also possible to provide only the ride-on restraint member 6 as the ride-on restraint member without providing the cover 5. The ride-on restraint member 6 in this configuration does not function as a "reinforcing member" for reinforcing the strength of the cover 5, but functions purely as a ride-on restraint member. In this case, the front surface of the riding restraining member 6 (more specifically, the front surface of the one-side hollow portion 62) can be arranged at a position substantially flush with the front surface W1 of the ground covering W. When the chamfered portion W2 is formed at the upper front corner of the ground cover W, the front surface of the riding restraining member 6 can be substantially aligned with the upper edge of the chamfered portion W2.

1 支柱
2 横梁
3 ベース部材
4 蓋部材
5 カバー
6 乗り上げ抑制部材
6d 乗り上げ抑制部材の下面
6u 乗り上げ抑制部材の上面
B1 アンカーボルト
B2 支柱を固定するためのボルト、固定部材、支柱取付用ボルト
W 地覆
DESCRIPTION OF SYMBOLS 1 Support 2 Horizontal beam 3 Base member 4 Cover member 5 Cover 6 Climbing restraining member 6d Lower surface of climbing restraining member 6u Upper surface of climbing restraining member B1 Anchor bolt B2 Bolt for fixing the strut, fixing member, bolt for mounting column W W Ground cover

Claims (4)

車両が通行する道路用橋梁における地覆上面に対し、下面が少なくとも当該地覆上面の車道側に固定され、上面が当該地覆上面よりも高い位置にある乗り上げ抑制部材を備え
前記乗り上げ抑制部材は、中空で地覆の長手方向に沿う長尺状体である、橋梁地覆への車両乗り上げ抑制構造。
With respect to the ground cover upper surface of the road bridge through which the vehicle passes, the lower surface is fixed to at least the roadside side of the ground cover upper surface, and the upper surface is provided with a ride-in restraint member at a position higher than the ground cover upper surface ,
The riding suppression member, Ru elongate body der along the longitudinal direction of the Jibuku hollow, the vehicle rides suppressing structure to bridge Jibuku.
前記乗り上げ抑制部材の少なくとも上方を覆うカバーを備える、請求項1に記載の橋梁地覆への車両乗り上げ抑制構造。 The vehicle riding restraining structure for a bridge ground cover according to claim 1, further comprising a cover that covers at least an upper portion of the riding restraining member. 前記乗り上げ抑制部材は地覆幅方向に並ぶように複数配置され、
各乗り上げ抑制部材の地覆幅方向における配置間隔は可変である、請求項1または2に記載の橋梁地覆への車両乗り上げ抑制構造。
A plurality of the riding restraining members are arranged so as to be aligned in the width direction of the ground covering,
The vehicle riding restraining structure for a bridge ground covering according to claim 1 or 2, wherein an arrangement interval of each riding restraining member in a width direction of the ground covering is variable.
請求項1〜3のいずれかに記載の車両乗り上げ抑制構造に用いる乗り上げ抑制部材。A riding restraining member used in the vehicle riding restraining structure according to claim 1.
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