JP6652462B2 - Bridge fence - Google Patents

Bridge fence Download PDF

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JP6652462B2
JP6652462B2 JP2016151852A JP2016151852A JP6652462B2 JP 6652462 B2 JP6652462 B2 JP 6652462B2 JP 2016151852 A JP2016151852 A JP 2016151852A JP 2016151852 A JP2016151852 A JP 2016151852A JP 6652462 B2 JP6652462 B2 JP 6652462B2
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holding
pillar
base member
column
bridge
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圭祐 中野
圭祐 中野
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Sekisui Jushi Corp
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Description

本発明は、特に、狭小な地覆に対して好適な橋梁用防護柵に関する。   The present invention relates to a protective fence for a bridge particularly suitable for a small ground cover.

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。   2. Description of the Related Art In recent years, serious accidents have occurred in which social infrastructure such as aging road structures has been damaged, resulting in casualties. For this reason, the renewal of aging social infrastructure is urgently needed, and this renewal is being promoted by the government and local governments.

例えば特許文献1には、既設のコンクリート製の地覆を用いた橋梁用防護柵の更新工法について記載されている。   For example, Patent Literature 1 describes a method of updating a protective fence for a bridge using an existing concrete ground cover.

ここで、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幅が狭く形成されていることが多い。   Bridges (road bridges) managed by local governments (prefectures, municipalities, etc.) are particularly obsolete due to, for example, older installation periods or shorter bridge lengths compared to nationally managed bridges. Are often formed to be narrow.

しかし、円滑な交通に支障をきたさないように、構造物を配置してはならない範囲に関し、道路構造令(政令)において定められた建築限界を確保することが、幅の狭い地覆に橋梁用防護柵を設けることでは困難な場合があった。このような場合、特許文献1に記載の更新工法を採用できず、例えば既設の幅の狭い地覆を撤去した上で新たな幅の広い地覆を構築する必要があって、更新工事の大幅なコストアップの一要因となっていた。   However, it is necessary to secure the building limit specified in the Road Construction Ordinance (Government Ordinance) in the area where structures should not be placed so as not to hinder smooth traffic. It was sometimes difficult to provide protective fences. In such a case, the renewal method described in Patent Literature 1 cannot be adopted. For example, it is necessary to remove the existing narrow ground cover and construct a new wide ground cover. This was one of the reasons for the cost increase.

特開2015−148148号公報JP-A-2015-148148

そこで本発明は前記問題に鑑み、幅の狭い地覆であっても、既設の地覆を利用して、道路構造令において定められた建築限界を確保した橋梁用防護柵を提供することを課題とする。   In view of the above problems, it is an object of the present invention to provide a protective fence for a bridge that uses the existing ground cover to secure the building limit specified in the Road Construction Ordinance even if the ground cover is narrow. And

本発明は、道路用橋梁における地覆上面に載置され、複数のアンカーボルト取付孔を有するベース部材と、前記ベース部材よりも上方に位置する柱部と、前記ベース部材に固定され、少なくとも一部が前記アンカーボルト取付孔よりも上方かつ道路と反対の方向である後方に延びる保持部材であって、前記柱部を保持する柱部保持部を有する保持部材と、を備え、前記柱部保持部は、前記柱部の少なくとも前方部分と側方部分とを保持する橋梁用防護柵である。   The present invention provides a base member having a plurality of anchor bolt mounting holes mounted on a ground cover upper surface of a road bridge, a column located above the base member, and at least one fixed to the base member. A holding member having a pillar holding portion that holds the pillar portion, the holding member extending rearward above the anchor bolt mounting hole and in a direction opposite to the road. The part is a bridge fence that holds at least a front part and a side part of the pillar part.

この構成によると、保持部材の少なくとも一部はベース部材のアンカーボルト取付孔よりも上方かつ後方に延びており、柱部保持部が柱部の少なくとも前方部分と側方部分とを保持する。このため、柱部をベース部材の後方に位置させることができる。   According to this configuration, at least a part of the holding member extends above and behind the anchor bolt mounting hole of the base member, and the pillar holding part holds at least a front part and a side part of the pillar. For this reason, the pillar portion can be located behind the base member.

また、前記保持部材は、前記ベース部材に固定されており上方に延びる第1部分と、該第1部分の上部から後方に延びる第2部分と、を備え、前記第2部分が前記柱部保持部を有するものとできる。   The holding member includes a first portion fixed to the base member and extending upward, and a second portion extending rearward from an upper portion of the first portion, wherein the second portion is configured to hold the column portion. Part can be provided.

この構成によると、ベース部材に固定するための第1部分と、柱部を保持するための第2部分とを別々に設けることができるので、保持部材を構成しやすい。   According to this configuration, the first portion for fixing to the base member and the second portion for holding the pillar portion can be separately provided, so that the holding member can be easily configured.

また、前記第1部分は、前記ベース部材の上面から上方に延びる部分であり、前記第2部分は、前記第1部分の上端から後方に延びる板状の部分であり、前記ベース部材の上面に対して前記第2部分の延びる方向のなす角度は、前方から後方に向かって下り勾配となる角度10度と、前方から後方に向かって登り勾配となる角度30度との間の角度であるものとできる。   The first portion is a portion extending upward from an upper surface of the base member, and the second portion is a plate-like portion extending rearward from an upper end of the first portion. On the other hand, the angle formed by the extending direction of the second portion is an angle between an angle of 10 degrees, which becomes a downward slope from the front to the rear, and an angle of 30 degrees, which becomes an upward slope from the front to the rear. And can be.

この構成によると、車両衝突時等の外力が橋梁用防護柵に働いた場合、第2部分が後方に移動するように保持部材が変形する。この変形により外力が吸収されることにより、ベース部材を地覆に固定するアンカーボルトにかかる引き抜き力を低減でき、地覆の損傷を抑制できる。   According to this configuration, when an external force acts on the bridge protection fence at the time of a vehicle collision or the like, the holding member is deformed so that the second portion moves rearward. The external force is absorbed by this deformation, so that the pull-out force applied to the anchor bolt fixing the base member to the ground cover can be reduced, and damage to the ground cover can be suppressed.

また、前記第1部分は、前記ベース部材の上面から上方に延びる板状の部分であり、前記第2部分は、前記第1部分の上端から後方に延びる板状の部分であり、前記第1部分と前記第2部分とは90度以上の角度で交差しているものとできる。   The first portion is a plate-like portion extending upward from an upper surface of the base member, and the second portion is a plate-like portion extending rearward from an upper end of the first portion. The portion and the second portion may intersect at an angle of 90 degrees or more.

この構成によると、車両衝突時等の外力が橋梁用防護柵に働いた場合、90度以上の角度で交差している第1部分と第2部分との角度が広がるように保持部材が変形する。この変形により外力が吸収されることにより、ベース部材を地覆に固定するアンカーボルトにかかる引き抜き力を低減でき、地覆の損傷を抑制できる。   According to this configuration, when an external force acts on the bridge protection fence at the time of a vehicle collision or the like, the holding member is deformed so that the angle between the first portion and the second portion that intersect at an angle of 90 degrees or more is widened. . The external force is absorbed by this deformation, so that the pull-out force applied to the anchor bolt fixing the base member to the ground cover can be reduced, and damage to the ground cover can be suppressed.

また、前記保持部材が、前方保持部と、該前方保持部よりも後方で前記ベース部材に固定されている後方保持部とを備えるものとできる。   Further, the holding member may include a front holding portion, and a rear holding portion fixed to the base member behind the front holding portion.

この構成によると、保持部材が、少なくとも前方保持部と後方保持部の2部材からなるので、保持部材が1部材からなる場合に比べて、柱部をより安定的に支えることができる。   According to this configuration, since the holding member includes at least two members, the front holding portion and the rear holding portion, the column portion can be supported more stably than when the holding member is formed of one member.

また、前記保持部材が、前記前方保持部と前記後方保持部とを連結する中間補強部を備えるものとできる。   Further, the holding member may include an intermediate reinforcing portion that connects the front holding portion and the rear holding portion.

この構成によると、中間補強部が前方保持部と後方保持部とを補強できるため、保持部材の強度を更に高めることができる。   According to this configuration, the intermediate reinforcing portion can reinforce the front holding portion and the rear holding portion, so that the strength of the holding member can be further increased.

また、前記柱部は、前記後方保持部の上面により下端部が保持され、かつ、前記前方保持部を貫通するものとできる。   Further, the pillar portion may have a lower end portion held by an upper surface of the rear holding portion and penetrate the front holding portion.

この構成によると、柱部が前方保持部を貫通することで、長手方向に連続した柱部を前方保持部と後方保持部の両方で保持できる。このため、ベース部材に対し、保持部材を介して柱部を確実に支持できる。   According to this configuration, the pillar portion penetrates the front holding portion, so that the pillar portion continuous in the longitudinal direction can be held by both the front holding portion and the rear holding portion. For this reason, the pillar portion can be reliably supported on the base member via the holding member.

本発明によると、柱部をベース部材の後方に位置させることができるので、幅の狭い地覆であっても、既設の地覆を利用して、道路構造令において定められた建築限界を確保できる。   According to the present invention, the pillar portion can be located behind the base member, so that even with a narrow ground cover, the building limit specified in the Road Construction Ordinance is secured by using the existing ground cover. it can.

本発明につき、一実施形態に係る橋梁用防護柵のうちベースユニットを示す左側面図である。It is a left view which shows the base unit among the protective fences for bridges concerning one Embodiment concerning this invention. 同ベースユニットを示し、(a)は平面図、(b)は底面図である。The base unit is shown, (a) is a top view, (b) is a bottom view. 同ベースユニットを示し、(a)は正面図、(b)は背面図である。The base unit is shown, (a) is a front view, (b) is a rear view. 本実施形態に係る橋梁用防護柵のうちベースユニットと支柱とを示す斜視図である。It is a perspective view which shows the base unit and the support | pillar among the protective fences for bridges concerning this embodiment. 本実施形態に係る橋梁用防護柵のうちベースユニット、支柱、横梁(二点鎖線表示)を示す斜視図である。It is a perspective view which shows the base unit, a support | pillar, and a cross beam (two-dot chain line display) among the bridge protective fences concerning this embodiment. 本実施形態に係る橋梁用防護柵のうちベースユニットと支柱とを示し、外力を受けて支柱が後方に移動した場合を示す左側面図である。It is a left view which shows the base unit and the support | pillar among the protective fences for bridges which concern on this embodiment, and shows the case where a support | pillar moves back by receiving external force.

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, an embodiment of the present invention will be described. Note that the present embodiment is merely an example for understanding the present invention, and variations, other than the present embodiment, regarding the shape, structure, material, and the like of each part are provided without departing from the spirit of the present invention. Needless to say, it is acceptable.

また、以下の説明における上下及び前後左右の表現は、橋梁用防護柵の内側(設置状態における道路側)から外側(設置状態における道路と反対側、河川側)を見た場合の方向表現である。   In addition, the expressions of up, down, front, rear, left, and right in the following description are directional expressions when the outside (the side opposite to the road in the installation state, the river side) is viewed from the inside (the road side in the installation state) of the bridge protection fence. .

本実施形態の橋梁用防護柵は、地覆W(図1に二点鎖線で図示)に固定される、道路の延長方向に沿って設けられた複数のベースユニット1と、複数のベースユニット1の各々に取り付けられ、各ベースユニット1から上方に延びる支柱5と、複数の支柱5に交わるように横方向に延びる複数の横梁6とを備える。図5に、1台のベースユニットに1本の支柱5を取り付けた状態を実線で示し、支柱5に取り付けられる3本の横梁6を二点鎖線で示している。ベースユニット1は、図1等に示すように、ベース部材2、柱部3、保持部材4からなる鋼製の部材である。   The bridge protective fence of the present embodiment includes a plurality of base units 1 fixed along a ground cover W (shown by a two-dot chain line in FIG. 1) and provided along an extending direction of a road. And a plurality of lateral beams 6 extending upward from each base unit 1 and extending laterally so as to intersect with the plurality of lateral columns 5. In FIG. 5, a state where one support 5 is attached to one base unit is shown by a solid line, and three cross beams 6 attached to the support 5 are shown by two-dot chain lines. The base unit 1 is a steel member including a base member 2, a pillar 3, and a holding member 4, as shown in FIG.

ベース部材2は、道路用橋梁における地覆Wの上面に載置される部分である。ベース部材2は、複数のアンカーボルト取付孔21を有している。本実施形態では、図1及び図2(a)(b)に示すように、平面視で左右方向に長く前後方向に短い長方形の平板状体であって、4箇所のアンカーボルト取付孔21を有している。アンカーボルト取付孔21は、保持部材4のうち前方保持部4Fの前方に2箇所、左右側方に2箇所設けられている。各アンカーボルト取付孔21は前後方向に長い長孔である。これによりベース部材2を、前後方向を調整して地覆Wの上面に載置することができる。地覆Wに埋め込まれたアンカーボルトBをアンカーボルト取付孔21に通し、アンカーボルトBのベース部材2から突出した部分にナットNを締結することで、ベース部材2を地覆Wに固定できる。なお、各アンカーボルト取付孔21は左右方向に長い長孔とすることもできる。この場合、例えば地覆Wの内部に位置する鉄筋にアンカーボルトBが干渉しないようにするため、アンカーボルトBまたはベース部材2全体を左右方向(橋梁の延長方向)にずらして配置することができる。また、ひとつのベース部材2に前後方向に長い長孔であるアンカーボルト取付孔21と、左右方向に長い長孔であるアンカーボルト取付孔21を共存させることもできる。   The base member 2 is a portion mounted on the upper surface of the ground cover W in the road bridge. The base member 2 has a plurality of anchor bolt mounting holes 21. In the present embodiment, as shown in FIGS. 1 and 2A and 2B, a rectangular plate-like body that is long in the left-right direction and short in the front-rear direction in plan view and has four anchor bolt mounting holes 21 is provided. Have. The anchor bolt mounting holes 21 are provided at two places in front of the front holding part 4F and two places on the left and right sides of the holding member 4. Each anchor bolt mounting hole 21 is a long hole that is long in the front-rear direction. Thereby, the base member 2 can be mounted on the upper surface of the ground cover W by adjusting the front-back direction. The base member 2 can be fixed to the ground cover W by passing the anchor bolt B embedded in the ground cover W through the anchor bolt mounting hole 21 and fastening a nut N to a portion of the anchor bolt B protruding from the base member 2. In addition, each anchor bolt mounting hole 21 may be a long hole that is long in the left-right direction. In this case, for example, in order to prevent the anchor bolt B from interfering with the reinforcing steel located inside the ground cover W, the anchor bolt B or the entire base member 2 can be displaced in the left-right direction (bridge extension direction). . Further, the anchor bolt mounting hole 21 which is a long hole elongated in the front-rear direction and the anchor bolt mounting hole 21 which is a long hole long in the left-right direction can coexist in one base member 2.

柱部3はベース部材2よりも上方に位置する部分である。柱部3は長手方向に連続した1本の部材から構成されており、長手方向が上下方向に一致するように配置されている。本実施形態の柱部3は、横断面視略正方形である1本の角型鋼管が用いられている。図3(a)(b)に示すように、柱部3の前面下部には前方支柱固定ボルト孔33が2箇所に貫通し、後面上部には後方支柱固定ボルト孔34が2箇所に貫通している。そして、柱部3の前後面の1箇所には同一高さで、横梁固定ボルト孔35が貫通している。   The pillar portion 3 is a portion located above the base member 2. The pillar 3 is formed of one member continuous in the longitudinal direction, and is arranged so that the longitudinal direction coincides with the vertical direction. As the column portion 3 of the present embodiment, one square steel pipe having a substantially square cross section is used. As shown in FIGS. 3 (a) and 3 (b), the front column fixing bolt holes 33 penetrate two places in the lower part of the front surface of the column part 3, and the rear column fixing bolt holes 34 penetrate two places in the upper part of the rear part. ing. The horizontal beam fixing bolt hole 35 penetrates at one position on the front and rear surfaces of the column 3 at the same height.

支柱5は柱部3に取り付けられる。図4及び図5に示すように、本実施形態における支柱5は柱部3のうち保持部材4(より詳しくは前方保持部4F)の上面よりも上方の部分を外方から覆うように取り付けられる。このため、支柱5として中空部材を用いることができるので、支柱5を軽量化できる。支柱5の取り付けは、前方支柱固定ボルト孔33及び後方支柱固定ボルト孔34を用いて、図5に示すように外部からボルトが取り付けられてなされる。また、本実施形態における3本の横梁6のうち下側の1本は、支柱5及び柱部3をボルトが貫通することで取り付けられる。柱部3と支柱5との上下方向における重なり寸法は、柱部3の前後または左右の断面寸法以上(1倍以上)の寸法にすることが望ましく、前記断面寸法の1倍以上2倍以下とすることがより望ましい(なお、2倍を超えることもできる)。支柱5は柱部3に対し、ぐらつきのないように強固に取り付けられる。また本実施形態では、柱部3の上端部に、前後方向に延びる補強板31が設けられている。この補強板31は、柱部3において開口している上端部を前後方向に補強することで、車両が衝突した際等の外力によって、柱部3が前後方向につぶされるように変形し、この変形により柱部3と支柱5との取り付け状態(嵌合状態)が緩むことや、衝突時の外力が有効に保持部材4に伝えられなくなることを抑制する。   The column 5 is attached to the column 3. As shown in FIGS. 4 and 5, the column 5 in the present embodiment is attached so as to cover a portion of the column portion 3 above the upper surface of the holding member 4 (more specifically, the front holding portion 4F) from the outside. . For this reason, since a hollow member can be used as the support 5, the support 5 can be reduced in weight. The support column 5 is attached by using a front support bolt hole 33 and a rear support bolt hole 34 and externally attaching bolts as shown in FIG. The lower one of the three cross beams 6 in the present embodiment is attached by the bolts penetrating the column 5 and the column 3. It is desirable that the vertical dimension of the column 3 and the column 5 be equal to or larger than the cross-sectional dimension of the front and rear or the left and right of the column 3 (one or more times). It is more desirable (it can be more than twice). The column 5 is firmly attached to the column 3 so that there is no wobble. In the present embodiment, a reinforcing plate 31 extending in the front-rear direction is provided at the upper end of the column 3. The reinforcing plate 31 reinforces the upper end portion of the pillar portion 3 opening in the front-rear direction, so that the pillar portion 3 is deformed by an external force such as when a vehicle collides, so that the pillar portion 3 is crushed in the front-rear direction. This prevents the deformation of the attachment state (fitting state) between the column portion 3 and the column 5 due to the deformation, and prevents the external force at the time of collision from being effectively transmitted to the holding member 4.

このように、柱部3と支柱5とを別個に形成することができるので、例えば柱部3を鋼製とし、支柱5をアルミ合金製とすることができる。よって、橋梁用防護柵の構成部材について材料選択の自由度が高く、例えば所望の強度や所望の外観を有し、しかも軽量化された支柱5を容易に形成できる。また、設置位置の勾配や段差への対応、ベース部材2を地覆W中の鉄筋を回避するように配置すること、そして顧客の要望に対応することが容易である。   Thus, since the pillar 3 and the support 5 can be formed separately, for example, the pillar 3 can be made of steel and the support 5 can be made of an aluminum alloy. Therefore, it is possible to easily form the pillar 5 having a high degree of freedom in selecting a material for the constituent members of the bridge protective fence and having, for example, a desired strength and a desired appearance and a reduced weight. In addition, it is easy to cope with a gradient or a step at the installation position, to arrange the base member 2 so as to avoid the reinforcing bar in the ground covering W, and to respond to customer requests.

保持部材4は、ベース部材2に固定されている。本実施形態では溶接によって固定されている。保持部材4の少なくとも一部(本実施形態では後方保持部4Bの一部を除いた部分)がベース部材2のアンカーボルト取付孔21の上端位置よりも上方かつ後方に延びる。そして保持部材4は、柱部3を保持する柱部保持部43を有する。   The holding member 4 is fixed to the base member 2. In this embodiment, it is fixed by welding. At least a part of the holding member 4 (a part excluding a part of the rear holding part 4B in the present embodiment) extends upward and rearward from an upper end position of the anchor bolt mounting hole 21 of the base member 2. The holding member 4 has a column holding portion 43 that holds the column 3.

本実施形態の保持部材4は、前方側に位置する前方保持部4Fと、前方保持部4Fに向かい合うようにして、前方保持部4Fよりも後方でベース部材2に固定されている後方保持部4Bとを備える。保持部材4が、少なくとも前方保持部4Fと後方保持部4Bの2部材からなるので、保持部材4が1部材からなる場合に比べて、保持部材4の強度を高めることができる。また、保持部材4が1部材からなる場合に比べて、柱部3をより安定的に支えることができる。しかも、後述のように、座屈強度(本説明では部材が塑性変形を開始する応力に対応する強度のことを言う)の設定に関し、前方保持部4Fと後方保持部4Bとで強度を分担させることができるため、1部材よりも自由度の高い設定が可能である。ただし、保持部材4が2部材からなる構成に限定されるものではなく、保持部材4が1部材からなる構成とすることもできる。   The holding member 4 of the present embodiment includes a front holding portion 4F located on the front side and a rear holding portion 4B fixed to the base member 2 behind the front holding portion 4F so as to face the front holding portion 4F. And Since the holding member 4 includes at least two members, the front holding portion 4F and the rear holding portion 4B, the strength of the holding member 4 can be increased as compared with the case where the holding member 4 is formed of one member. Further, the column portion 3 can be more stably supported as compared with the case where the holding member 4 is formed of one member. In addition, as described later, regarding the setting of the buckling strength (in this description, the strength corresponding to the stress at which the member starts plastic deformation), the front holding portion 4F and the rear holding portion 4B share the strength. Therefore, setting with a higher degree of freedom than one member is possible. However, the configuration is not limited to the configuration in which the holding member 4 is formed of two members, and the configuration may be such that the holding member 4 is formed of one member.

前方保持部4F、後方保持部4Bの各々は曲げ加工により、側面視で「へ」の字あるいは「V」の字状に屈曲して形成された1枚の板状体である。このように前方保持部4F、後方保持部4Bの各々を屈曲して形成することにより、地覆Wの上面に近い位置(下方位置)において建築限界を確保した状態で、保持部材4が柱部3を支持することが可能である。本実施形態では、前方保持部4Fを柱部3が上下に貫通する。このため、前方保持部4Fの幅寸法(左右寸法)は、柱部3の幅寸法よりも大きい。また、後方保持部4Bの幅寸法(左右寸法)も、柱部3の幅寸法よりも大きい。ただし、後方保持部4Bは前方保持部4Fのように柱部3が貫通するものではないので、幅寸法を柱部3の幅寸法よりも小さくすることもできる。なお、後方保持部4Bの幅寸法が柱部3の幅寸法以上である方が、柱部保持部43を柱部3の全周に確保できることから、強度を確保する観点で望ましい。そして、後方保持部4Bの上面により柱部3の下端部32が保持される。このため、前方保持部4Fの板厚よりも後方保持部4Bの板厚の方が大きくなっている。この構成により、後方保持部4Bが柱部3、支柱5、横梁6の荷重を確実に負担できる。   Each of the front holding portion 4F and the rear holding portion 4B is a single plate-shaped body formed by bending to bend into a “H” or “V” shape in a side view. By bending each of the front holding portion 4F and the rear holding portion 4B in this manner, the holding member 4 can be positioned at a position close to the upper surface of the ground cover W (downward position) and the holding member 4 can be positioned in the pillar portion. 3 can be supported. In the present embodiment, the pillar portion 3 vertically penetrates the front holding portion 4F. For this reason, the width dimension (left-right dimension) of the front holding part 4 </ b> F is larger than the width dimension of the column part 3. Further, the width dimension (left-right dimension) of the rear holding portion 4B is also larger than the width dimension of the column portion 3. However, since the pillar portion 3 does not penetrate the rear holding portion 4B unlike the front holding portion 4F, the width can be made smaller than the width of the pillar 3. It is preferable that the width of the rear holding portion 4B is equal to or larger than the width of the column portion 3 from the viewpoint of securing the strength since the column holding portion 43 can be secured on the entire circumference of the column portion 3. Then, the lower end portion 32 of the pillar portion 3 is held by the upper surface of the rear holding portion 4B. For this reason, the thickness of the rear holding portion 4B is larger than the thickness of the front holding portion 4F. With this configuration, the rear holding portion 4B can surely bear the load of the column portion 3, the support column 5, and the cross beam 6.

また、後方保持部4Bの後方には空間部Sが確保されている。この空間部Sは後方保持部4Bの変形を許容する空間である。具体的に、空間部Sは図6に示すように、後方保持部4Bにおける第1部分41の後方への倒れ込み、及び、第2部分42の後方かつ下方への移動を許容する。   Further, a space S is secured behind the rear holding portion 4B. This space S is a space that allows deformation of the rear holding portion 4B. Specifically, as shown in FIG. 6, the space S allows the first portion 41 of the rear holding portion 4B to fall backward and the second portion 42 to move backward and downward.

前方保持部4F、後方保持部4Bの各々(以下「各保持部」と記載する)は、ベース部材2に固定されており上方に延びる第1部分41と、第1部分41の上部から後方に延びる第2部分42と、を備える。第1部分41は、ベース部材2の上面22から上方に延びる板状の部分である。第2部分42は、第1部分41の上端から後方に延びる板状の部分である。より詳しく言うと、前方保持部4Fの第1部分41は、ベース部材2の上面22に固定されており、垂直上方に延びている。一方、後方保持部4Bの第1部分41は、ベース部材2の背面23に固定されており、垂直上方に延びている。また、各保持部4F,4Bの第2部分42は後ろ斜め上方に延びている。各保持部4F,4Bにおける第1部分41は本実施形態では垂直上方に延びているが、これに限定されず、斜め上方に延びるよう構成することもできる。各保持部4F,4Bにおける第1部分41の延びる方向につき、ベース部材2の上面22に対する角度は90度を基準に前後10度の範囲内とすることが、保持部材4の変形のしやすさを担保するために望ましい。なお、第2部分42のベース部材2に対する角度、また、第1部分41及び第2部分42の相互の角度の設定に関しては後述する。   Each of the front holding portion 4F and the rear holding portion 4B (hereinafter, referred to as “each holding portion”) is fixed to the base member 2 and extends upward, and a first portion 41 extends rearward from above the first portion 41. A second portion 42 that extends. The first portion 41 is a plate-like portion extending upward from the upper surface 22 of the base member 2. The second portion 42 is a plate-like portion extending rearward from the upper end of the first portion 41. More specifically, the first portion 41 of the front holding portion 4F is fixed to the upper surface 22 of the base member 2 and extends vertically upward. On the other hand, the first portion 41 of the rear holding portion 4B is fixed to the back surface 23 of the base member 2 and extends vertically upward. The second portion 42 of each of the holding portions 4F and 4B extends obliquely rearward and upward. The first portion 41 of each of the holding portions 4F and 4B extends vertically upward in the present embodiment, but is not limited thereto, and may be configured to extend obliquely upward. Regarding the direction in which the first portion 41 of each of the holding portions 4F and 4B extends, the angle of the holding member 4 with respect to the upper surface 22 of the base member 2 is preferably within 10 degrees before and after 90 degrees. Desirable to secure. The setting of the angle of the second portion 42 with respect to the base member 2 and the mutual angle of the first portion 41 and the second portion 42 will be described later.

各保持部4F,4Bにおける第2部分42は柱部保持部43を有する。この柱部保持部43は、柱部3の少なくとも前方部分と側方部分とを保持する。本実施形態では、前方保持部4Fの第2部分42に柱部3が貫通し、後方保持部4Bの第2部分42に柱部3の下端部32が位置している。つまり、前方保持部4Fは相対的に柱部3の上部を保持し、後方保持部4Bは相対的に柱部3の下部を保持している。そして、各保持部4F,4Bの第2部分42と柱部3とは溶接により固定されている。溶接部分が柱部保持部43である。このため、各保持部4F,4Bにおける柱部保持部43は、柱部3の後方部分も加わって、柱部3の全周を保持している。なお、柱部保持部43が柱部3の前方部分と側方部分のみを保持する場合は、第2部分42において柱部3よりも後方に延びる部分を省略することもできる。   The second portion 42 in each of the holding portions 4F and 4B has a pillar portion holding portion 43. The pillar holding portion 43 holds at least a front portion and a side portion of the pillar 3. In the present embodiment, the column portion 3 penetrates through the second portion 42 of the front holding portion 4F, and the lower end portion 32 of the column portion 3 is located in the second portion 42 of the rear holding portion 4B. That is, the front holding portion 4F relatively holds the upper portion of the column portion 3, and the rear holding portion 4B relatively holds the lower portion of the column portion 3. And the 2nd part 42 of each holding | maintenance part 4F, 4B and the pillar part 3 are being fixed by welding. The welded portion is the column holder 43. For this reason, the pillar holding part 43 in each of the holding parts 4F and 4B holds the entire circumference of the pillar 3 together with the rear part of the pillar 3. When the column holder 43 holds only the front and side portions of the column 3, the portion of the second portion 42 extending rearward from the column 3 can be omitted.

このように本実施形態の保持部材4は、ベース部材2に固定するための第1部分41と、柱部3を保持するための第2部分42とを別々に設けることができるので、保持部材4を構成しやすい。   As described above, in the holding member 4 of the present embodiment, the first portion 41 for fixing to the base member 2 and the second portion 42 for holding the column portion 3 can be separately provided. 4 is easy to compose.

また、柱部3が前方保持部4Fを貫通することで、長手方向に連続した柱部3を前方保持部4Fと後方保持部4Bの両方で保持できる。このため、ベース部材2に対し、保持部材4を介して柱部3を確実に支持できる。   Further, since the pillar 3 penetrates the front holding portion 4F, the pillar 3 continuous in the longitudinal direction can be held by both the front holding portion 4F and the rear holding portion 4B. For this reason, the pillar 3 can be reliably supported on the base member 2 via the holding member 4.

本実施形態の保持部材4は、更に、前方保持部4Fと後方保持部4Bとを連結する中間補強部4Cを備える。この構成によると、中間補強部4Cが前方保持部4Fと後方保持部4Bとを補強できるため、保持部材4の強度を更に高めることができる。本実施形態の中間補強部4Cは、柱部3の前方であり前方保持部4Fと後方保持部4Bとの間に垂直方向に配置された板状体であって、ベース部材2と柱部3とにも連結されている。このように中間補強部4Cがベース部材2と柱部3とを連結するため、柱部3が後方に倒れ込もうとする場合に、中間補強部4Cが「突っ張る」ことで過剰な倒れ込みが抑制される。なお、本実施形態における前記連結は溶接によりなされている。   The holding member 4 of the present embodiment further includes an intermediate reinforcing portion 4C that connects the front holding portion 4F and the rear holding portion 4B. According to this configuration, since the intermediate reinforcing portion 4C can reinforce the front holding portion 4F and the rear holding portion 4B, the strength of the holding member 4 can be further increased. The intermediate reinforcing portion 4C of the present embodiment is a plate-like body disposed in front of the column portion 3 and vertically between the front holding portion 4F and the rear holding portion 4B, and includes the base member 2 and the column portion 3. Also linked to. As described above, since the intermediate reinforcing portion 4C connects the base member 2 and the column portion 3, when the column portion 3 tries to fall backward, the intermediate reinforcing portion 4C "stretches", thereby suppressing excessive falling. Is done. The connection in the present embodiment is made by welding.

以上、本実施形態の橋梁用防護柵は、保持部材4の少なくとも一部がベース部材2のアンカーボルト取付孔21よりも上方かつ後方に延びており、柱部保持部43が柱部3の少なくとも前方部分と側方部分とを保持するよう構成されている。このため、柱部3をベース部材2の後方にずらせて位置させることができる。よって、柱部3、支柱5、横梁6を、地覆Wの上面に固定したベース部材2の後方に張り出すようにして位置させることができる。したがって、幅の狭い地覆Wであっても、既設の地覆Wを利用して、道路構造令において定められた建築限界を確保できる。   As described above, in the bridge protective fence of the present embodiment, at least a part of the holding member 4 extends above and behind the anchor bolt mounting hole 21 of the base member 2, and the column holding portion 43 has at least a portion of the column 3. It is configured to hold a front portion and a side portion. For this reason, the pillar 3 can be shifted and positioned behind the base member 2. Therefore, the pillar portion 3, the support pillar 5, and the cross beam 6 can be positioned so as to project behind the base member 2 fixed to the upper surface of the ground cover W. Therefore, even if the ground cover W is narrow, the building limit specified in the Road Construction Ordinance can be secured by using the existing ground cover W.

また、本実施形態の保持部材4は、適度な座屈強度に設定することで、支柱5や横梁6に車両が衝突した際に、衝突に係る外力によって保持部材4が座屈変形(本説明では塑性変形のことを言う)するものとし、変形によるエネルギー吸収に伴い保持部材4にて外力を吸収するよう構成できる。前述のように、側面視で「へ」の字あるいは「V」の字状とされた各保持部4F,4Bの形状は、前記適度な強度に応じて設定されている。   Further, by setting the holding member 4 of the present embodiment to an appropriate buckling strength, when the vehicle collides with the strut 5 or the cross beam 6, the holding member 4 is buckled and deformed by an external force related to the collision (this explanation). This means plastic deformation), and the holding member 4 can absorb an external force with the energy absorption by the deformation. As described above, the shape of each of the holding portions 4F and 4B in the shape of “H” or “V” in side view is set according to the appropriate strength.

前記設定に関し、まず、ベース部材2の上面22に対して第2部分42の延びる方向のなす角度θ1は、前方から後方に向かって下り勾配となる角度10度と、前方から後方に向かって登り勾配となる角度30度との間の、40度の範囲内の角度とされている。より望ましい範囲は、前方から後方に向かって登り勾配となる角度で0度(水平)以上30度以下の範囲である。   Regarding the above setting, first, the angle θ1 formed by the direction in which the second portion 42 extends with respect to the upper surface 22 of the base member 2 is an angle of 10 degrees, which is a downward gradient from the front to the rear, and an angle of 10 degrees, which is upward from the front to the rear. The angle is set within a range of 40 degrees between the inclination angle of 30 degrees. A more desirable range is a range of 0 ° (horizontal) or more and 30 ° or less at an angle of an ascending gradient from the front to the rear.

一方、各保持部4F,4Bの第1部分41と第2部分42とは90度以上の角度θ2で交差している。本実施形態では図示のように鈍角で交差している。ただし、角度θ2は90度以上に限定されず、鋭角(90度未満)であってもよい。鋭角とする場合で、保持部材4の変形のしやすさを担保するためには、70度以上90度未満とすることが望ましい。   On the other hand, the first portion 41 and the second portion 42 of each of the holding portions 4F and 4B intersect at an angle θ2 of 90 degrees or more. In the present embodiment, they intersect at an obtuse angle as shown. However, the angle θ2 is not limited to 90 degrees or more, and may be an acute angle (less than 90 degrees). In the case of an acute angle, it is preferable that the angle is 70 degrees or more and less than 90 degrees in order to secure the ease of deformation of the holding member 4.

このような設定により、車両衝突時等の外力が橋梁用防護柵に働いた場合、保持部材4が適切に変形して、支柱5が後方に倒れ込むように傾く。これに伴い、本実施形態の前方保持部4Fにおいては、図6に示すように、第1部分41と第2部分42の両方が後方に引っ張られることになるため、第1部分41が後方に倒れて第2部分42が後方に移動する。その結果、第1部分41と第2部分42との交差部分の角度が広がるように前方保持部4Fが変形する。角度θ1,θ2を前記のように設定しておくことにより、支柱5の前記後方への倒れ込みに対して保持部材4が突っ張ることで抵抗となることが生じにくい。   With such a setting, when an external force acts on the bridge protection fence at the time of a vehicle collision or the like, the holding member 4 is appropriately deformed, and the support column 5 is inclined so as to fall backward. Accordingly, in the front holding portion 4F of the present embodiment, as shown in FIG. 6, since both the first portion 41 and the second portion 42 are pulled rearward, the first portion 41 is moved rearward. The second part 42 falls down and moves backward. As a result, the front holding portion 4F is deformed so that the angle of the intersection between the first portion 41 and the second portion 42 increases. By setting the angles θ1 and θ2 as described above, it becomes difficult for the holding member 4 to be resistant to the rearward fall of the column 5 due to the tension.

一方、本実施形態の後方保持部4Bにおいては、支柱5の後方への倒れ込みの「支点」に近い位置に当該後方保持部4Bが存在するため、支柱5が後方へ倒れ込むに伴い、柱部3の下端部32は前方にせり出すように変形する。このため図6に示すように、第2部分42は前方に移動して、ベース部材2に対する傾斜が浅くなるように変形し、第1部分41は前方に向かい中間補強部4Cを押すよう変形する。その結果、第1部分41と第2部分42との交差部分の角度は狭まるように後方保持部4Bが変形する。   On the other hand, in the rear holding portion 4B of the present embodiment, since the rear holding portion 4B is present at a position near the “fulcrum” of the column 5 falling backward, the column portion 3 falls as the column 5 falls rearward. Is deformed so as to protrude forward. For this reason, as shown in FIG. 6, the second portion 42 moves forward and deforms so that the inclination with respect to the base member 2 becomes shallow, and the first portion 41 deforms so as to push forward and press the intermediate reinforcing portion 4C. . As a result, the rear holding portion 4B is deformed such that the angle of the intersection between the first portion 41 and the second portion 42 is reduced.

これらの変形により車両衝突時等の外力が吸収されることにより、ベース部材2を地覆Wに固定するアンカーボルトBにかかる引き抜き力を低減できる。このため、地覆Wの損傷を抑制できる。このように地覆Wの損傷を抑制できると、地覆Wの補修は不要となるか最低限の補修で済むため、損傷したベースユニット1、支柱5、横梁6を交換するだけで復旧が可能である。このため、復旧工事のコストを抑制できる。   The external force at the time of a vehicle collision or the like is absorbed by these deformations, so that the pull-out force applied to the anchor bolt B that fixes the base member 2 to the ground cover W can be reduced. Therefore, damage to the ground cover W can be suppressed. If the damage to the ground cover W can be suppressed in this way, the repair of the ground cover W is not necessary or only a minimum repair is required. Therefore, the repair can be performed by simply replacing the damaged base unit 1, the support 5, and the cross beam 6. It is. For this reason, the cost of restoration work can be suppressed.

なお本実施形態では、前方保持部4Fにおいて柱部保持部43の設けられた部分と中間補強部4Cが設けられた部分とで座屈強度が異なることにより、図6に示すように、第2部分42の途中でも曲げ変形が生じている。   In the present embodiment, as shown in FIG. 6, the buckling strength of the portion where the column holding portion 43 is provided and the portion where the intermediate reinforcing portion 4C is provided in the front holding portion 4F are different from each other. Bending deformation occurs even in the middle of the portion 42.

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。   As described above, the embodiments of the present invention have been described, but the present invention is not limited to the above-described embodiments, and various changes can be made without departing from the gist of the present invention.

例えば、前記実施形態のベース部材2は、柱部3の直下には存在していないが、ベース部材2を柱部3の直下まで延長させることもできる。   For example, the base member 2 of the above-described embodiment does not exist directly below the column 3, but the base member 2 can be extended to just below the column 3.

また、前記実施形態の柱部3は、図2(a)(b)に示すように、横断面視略正方形である角型鋼管が用いられていた。しかし、柱部3はこれに限定されず、例えば円形管、横断面視略長方形である角型管、チャンネル材、中実材料等、種々の形状としてよい。   In addition, as shown in FIGS. 2A and 2B, the column portion 3 of the above-described embodiment uses a square steel pipe having a substantially square cross section. However, the column portion 3 is not limited to this, and may have various shapes such as a circular tube, a rectangular tube having a substantially rectangular cross section, a channel material, and a solid material.

また、柱部3と支柱5とを一体で形成することもできる。   Further, the column 3 and the column 5 can be formed integrally.

また、保持部材4における第1部分41と第2部分42につき、本実施形態では板状とされていたが、柱部保持部43を確保できるのであれば、少なくとも一方が棒状等、他の形状であってもよい。   In the present embodiment, the first portion 41 and the second portion 42 of the holding member 4 are plate-shaped. However, if the column portion holding portion 43 can be secured, at least one of the first portion 41 and the second portion 42 has another shape such as a bar shape. It may be.

また、前記実施形態では、前方保持部4Fの第1部分41と後方保持部4Bの第1部分41とは略平行とされ、前方保持部4Fの第2部分42と後方保持部4Bの第2部分42とは略平行とされていた。しかし、これに限定されず、各部分41,42の延びる方向が異なっていてもよい。   Further, in the embodiment, the first portion 41 of the front holding portion 4F and the first portion 41 of the rear holding portion 4B are substantially parallel, and the second portion 42 of the front holding portion 4F and the second portion 42 of the rear holding portion 4B. The portion 42 was substantially parallel. However, the present invention is not limited to this, and the extending directions of the portions 41 and 42 may be different.

また、前記実施形態のように1本の柱部3が前方保持部4Fを貫通するように構成せず、前方保持部4Fの上方と下方に別体の柱部3を位置させることもできる。さらに、前方保持部4Fと後方保持部4Bとの間に柱部3を配置せず、前記実施形態より拡大させた中間補強部4Cのみを配置することもできる。   Further, unlike the above-described embodiment, one pillar 3 is not configured to penetrate the front holding portion 4F, and separate pillars 3 can be located above and below the front holding portion 4F. Further, it is also possible to dispose only the intermediate reinforcing portion 4C enlarged from the above-described embodiment without disposing the pillar portion 3 between the front holding portion 4F and the rear holding portion 4B.

また、後方保持部4Bの後方の空間部Sに補強材等を配置することにより、後方保持部4Bを補強することもできる。   Further, by arranging a reinforcing material or the like in the space S behind the rear holding portion 4B, the rear holding portion 4B can be reinforced.

また、後方保持部4Bにおける第2部分42の前端部(第1部分41との接合部付近)に上下に貫通する水抜き孔を設けることもできる。この水抜き孔により、柱部3の内部に浸入した雨水等を排出でき、ベースユニット1の腐食を抑制できる。   In addition, a drain hole that penetrates up and down may be provided at the front end of the second portion 42 (near the joint with the first portion 41) in the rear holding portion 4B. With this drain hole, rainwater or the like that has entered the inside of the pillar portion 3 can be discharged, and corrosion of the base unit 1 can be suppressed.

また、前記実施形態につき、第2部分42のベース部材2に対する角度θ1と、第1部分41と第2部分42との相互の角度θ2の設定とに関して述べた。これら角度の設定条件は、2条件とも満たすものに限定されず、いずれか1条件だけを満たすよう設定することもできる。このため、例えば第1部分41と第2部分42とは鋭角で交差させることもできる。   In the above-described embodiment, the setting of the angle θ1 of the second portion 42 with respect to the base member 2 and the setting of the mutual angle θ2 between the first portion 41 and the second portion 42 have been described. These angle setting conditions are not limited to satisfying both conditions, and may be set so as to satisfy only one of the conditions. Therefore, for example, the first portion 41 and the second portion 42 can intersect at an acute angle.

1 ベースユニット
2 ベース部材
21 アンカーボルト取付孔
3 柱部
32 柱部の下端部
4 保持部材
4F 前方保持部
4B 後方保持部
4C 中間補強部
41 第1部分
42 第2部分
43 柱部保持部
5 支柱
6 横梁
W 地覆
B アンカーボルト
θ1 ベース部材の上面に対して第2部分の延びる方向のなす角度
θ2 第1部分と前記第2部分とのなす角度
DESCRIPTION OF SYMBOLS 1 Base unit 2 Base member 21 Anchor bolt attachment hole 3 Column part 32 Lower part of column part 4 Holding member 4F Front holding part 4B Rear holding part 4C Intermediate reinforcing part 41 First part 42 Second part 43 Column holding part 5 Post 6 Cross beam W Ground covering B Anchor bolt θ1 Angle between the upper surface of the base member and the direction in which the second portion extends θ2 Angle between the first portion and the second portion

Claims (7)

道路用橋梁における地覆上面に載置され、複数のアンカーボルト取付孔を有するベース部材と、
前記ベース部材よりも上方に位置する柱部と、
前記ベース部材に固定され、少なくとも一部が前記アンカーボルト取付孔よりも上方かつ道路と反対の方向である後方に延びる保持部材であって、前記柱部を保持する柱部保持部を有する保持部材と、を備え、
前記柱部保持部は、前記柱部の少なくとも前方部分と側方部分とを保持する橋梁用防護柵。
A base member that is placed on the ground cover upper surface of the road bridge and has a plurality of anchor bolt mounting holes,
A pillar portion located above the base member;
A holding member fixed to the base member and at least partially extending rearward above the anchor bolt mounting hole and in a direction opposite to a road, the holding member having a pillar holding portion that holds the pillar. And
The bridge fence, wherein the pillar holding part holds at least a front part and a side part of the pillar.
前記保持部材は、前記ベース部材に固定されており上方に延びる第1部分と、該第1部分の上部から後方に延びる第2部分と、を備え、
前記第2部分が前記柱部保持部を有する、請求項1に記載の橋梁用防護柵。
The holding member includes a first portion fixed to the base member and extending upward, and a second portion extending rearward from an upper portion of the first portion,
The bridge fence according to claim 1, wherein the second portion has the pillar holding portion.
前記第1部分は、前記ベース部材の上面から上方に延びる部分であり、
前記第2部分は、前記第1部分の上端から後方に延びる板状の部分であり、
前記ベース部材の上面に対して前記第2部分の延びる方向のなす角度は、前方から後方に向かって下り勾配となる角度10度と、前方から後方に向かって登り勾配となる角度30度との間の角度である、請求項2に記載の橋梁用防護柵。
The first portion is a portion extending upward from an upper surface of the base member,
The second portion is a plate-like portion extending rearward from an upper end of the first portion,
The angle formed by the direction in which the second portion extends with respect to the upper surface of the base member is an angle of 10 degrees, which is a downward slope from the front to the rear, and an angle of 30 degrees, which is an upward slope from the front to the rear. The protective fence for a bridge according to claim 2, which is an angle between the two.
前記第1部分は、前記ベース部材の上面から上方に延びる板状の部分であり、
前記第2部分は、前記第1部分の上端から後方に延びる板状の部分であり、
前記第1部分と前記第2部分とは90度以上の角度で交差している、請求項2または3に記載の橋梁用防護柵。
The first portion is a plate-like portion extending upward from an upper surface of the base member,
The second portion is a plate-like portion extending rearward from an upper end of the first portion,
The bridge fence according to claim 2 or 3, wherein the first portion and the second portion intersect at an angle of 90 degrees or more.
前記保持部材が、前方保持部と、該前方保持部よりも後方で前記ベース部材に固定されている後方保持部とを備える、請求項1〜4のいずれかに記載の橋梁用防護柵。   The bridge protection fence according to any one of claims 1 to 4, wherein the holding member includes a front holding portion and a rear holding portion fixed to the base member behind the front holding portion. 前記保持部材が、前記前方保持部と前記後方保持部とを連結する中間補強部を備える、請求項5に記載の橋梁用防護柵。   The protective fence for a bridge according to claim 5, wherein the holding member includes an intermediate reinforcing portion that connects the front holding portion and the rear holding portion. 前記柱部は、前記後方保持部の上面により下端部が保持され、かつ、前記前方保持部を貫通する、請求項5または6に記載の橋梁用防護柵。   The bridge protection fence according to claim 5, wherein the pillar has a lower end held by an upper surface of the rear holding part and penetrates the front holding part.
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