JP5717551B2 - Guard fence and its construction method - Google Patents

Guard fence and its construction method Download PDF

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JP5717551B2
JP5717551B2 JP2011132612A JP2011132612A JP5717551B2 JP 5717551 B2 JP5717551 B2 JP 5717551B2 JP 2011132612 A JP2011132612 A JP 2011132612A JP 2011132612 A JP2011132612 A JP 2011132612A JP 5717551 B2 JP5717551 B2 JP 5717551B2
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concrete foundation
cylindrical member
protective fence
buffer member
mountain side
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JP2013002090A (en
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細川　豊
細川　　豊
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RAITEKU CO., LTD.
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Description

この発明は、山間地の道路等の山側斜面に構築し、落石や積雪等を受け止めて道路等への落下、流入を阻止する防護柵とその施工方法に関する。   The present invention relates to a protective fence that is constructed on a mountain slope such as a road in a mountainous area, receives falling rocks and snow, etc., and prevents falling and inflowing onto a road and the like, and a construction method thereof.

従来から、山腹の斜面部等に構築して落石や積雪等を受け止めて道路等への落下、流入を防止する防護柵が知られている。この種の防護柵として、例えば、特許文献１に開示されているように、コンクリート基礎の上面に立てて固定された複数の埋設柱に円筒状のパイプを被せ、中空にモルタル等の固定材を注入して補強した支柱を形成し、複数の支柱の間にネットを張設した落石防護柵がある。また、支柱を形成する際、モルタル以外に、硬化後に高い弾性を示す固定材を注入することによって、パイプの耐久性を高くすることができるという構成も開示している。   2. Description of the Related Art Conventionally, a protective fence is known that is constructed on a slope of a mountainside or the like and receives falling rocks, snow, and the like to prevent falling or inflowing onto a road or the like. As this type of protective fence, for example, as disclosed in Patent Document 1, a cylindrical pipe is put on a plurality of buried pillars that are fixed upright on the upper surface of a concrete foundation, and a fixing material such as mortar is hollowed. There is a rockfall guard fence that is formed by injecting and reinforcing struts, and a net is stretched between the struts. Moreover, when forming a support | pillar, the structure which can make durability of a pipe high by inject | pouring the fixing material which shows high elasticity after hardening other than mortar is also disclosed.

特開２００２−４７６１７号公報JP 2002-47617 A

特許文献１の落石防護柵は、埋設柱とパイプを固定する際に、コンクリートやモルタル等のいわゆる湿式の固定材が用いられるので、固定材が硬化して十分な強度を発揮できるようにするため、所定の条件で養生を行わなければならない。養生は、適度な温度や水分を保つなどの管理の手間が掛かるうえ、硬化するまで少なくとも数日間は放置する必要があり、防護柵の施工を長期化させる要因になっていた。   In the rock fall protection fence of Patent Document 1, since a so-called wet fixing material such as concrete or mortar is used when fixing the buried pillar and the pipe, the fixing material can be cured and exhibit sufficient strength. It must be cured under the prescribed conditions. Curing takes time and effort to maintain an appropriate temperature and moisture, and it is necessary to leave it for at least several days until it hardens, which has been a factor in prolonging the construction of protective fences.

この発明は、上記背景技術に鑑みて成されたものであり、既設の埋設柱を利用する等して簡単に支柱を組み立てることができ、優れた緩衝性を備えた防護柵とその施工方法を提供することを目的とする。   The present invention has been made in view of the above-described background art, and can easily assemble a support column by utilizing an existing buried pillar, and a protective fence having excellent buffering properties and a method for its construction. The purpose is to provide.

この発明は、山間地の山側斜面に設置されたコンクリート基礎と、前記コンクリート基礎の上面に立設された複数の支柱と、前記複数の支柱の間に張設されたネットとを備えた防護柵であって、前記支柱は、前記コンクリート基礎に下端部が埋設された埋設柱と、前記埋設柱の外側に隙間を空けて被せられ下端部が前記コンクリート基礎の上面に固定された筒状部材とで構成され、少なくとも前記埋設柱の山側の側面と前記筒状部材の山側の内側面との間に、予め所定形状に形成され弾性変形により衝撃を吸収する弾性体の固形物である緩衝部材を介挿可能に設けられている防護柵である。 The present invention relates to a protective fence comprising a concrete foundation installed on a mountain side slope in a mountainous area, a plurality of support posts erected on the upper surface of the concrete foundation, and a net stretched between the plurality of support pillars. The strut includes an embedded column in which a lower end portion is embedded in the concrete foundation, and a tubular member that is covered with a gap on the outer side of the embedded column and the lower end portion is fixed to the upper surface of the concrete foundation. A cushioning member, which is a solid body of an elastic body that is formed in advance in a predetermined shape and absorbs an impact by elastic deformation , at least between a side surface on the mountain side of the buried pillar and an inner side surface on the mountain side of the cylindrical member. This is a protective fence that can be inserted.

前記埋設柱は、２本のフランジが山の斜面に対向する向きに立設されたＨ形鋼であり、前記筒状部材の内側面には平坦部が設けられ、前記埋設柱の山側に位置したフランジと前記筒状部材の前記平坦部との間に前記緩衝部材を設けたものである。   The buried pillar is an H-shaped steel in which two flanges are erected in a direction facing a slope of a mountain, and a flat portion is provided on the inner surface of the cylindrical member, and is located on the mountain side of the buried pillar. The cushioning member is provided between the flange and the flat portion of the tubular member.

またこの発明は、山間地の山側斜面にコンクリート基礎を施工し、前記コンクリート基礎の上面に複数の支柱を立設し、前記複数の支柱の間にネットを張設する防護柵の施工方法であって、前記コンクリート基礎に下端部が埋設された埋設柱の外側に、所定の隙間を空けて筒状部材を被せ、前記筒状部材を前記埋設柱に被せる際又はその前後に、少なくとも前記埋設柱の山側の側面と前記筒状部材の山側の内側面との間に、予め所定形状に形成され弾性変形により衝撃を吸収する弾性体の固形物である緩衝部材を設ける防護柵の施工方法である。 The present invention also relates to a method for constructing a protective fence in which a concrete foundation is constructed on a mountain-side slope in a mountainous area, a plurality of columns are erected on the top surface of the concrete foundation, and a net is stretched between the plurality of columns. Then, a cylindrical member is put on the outside of the buried pillar, the lower end of which is buried in the concrete foundation, with a predetermined gap, and at least before or after the buried pillar is covered with the tubular member. This is a construction method of a protective fence in which a buffer member, which is a solid body of an elastic body that is formed in advance in a predetermined shape and absorbs an impact by elastic deformation , is formed between a side surface on the mountain side and an inner side surface on the mountain side of the cylindrical member .

前記緩衝部材は、ゴム又はゲルから成る弾性体シートであり、Ｈ形鋼である前記埋設柱の山側に位置するフランジと前記筒状部材の平坦部とが対面する間隙に前記緩衝部材を挿入するものである。 The buffer member is an elastic sheet made of rubber or gel, and the buffer member is inserted into a gap between a flange located on the mountain side of the buried pillar made of H-shaped steel and a flat portion of the cylindrical member. Is.

前記緩衝部材は、板ばねであり、Ｈ形鋼である前記埋設柱の山側に位置するフランジに前記緩衝部材を固定した後、前記筒状部材を前記埋設柱に被せるものである。または、前記埋設柱の山側に位置する前記フランジに前記緩衝部材を予め固定し、前記コンクリート基礎に前記埋設柱を設置するものでもよい。 The said buffer member is a leaf | plate spring, After fixing the said buffer member to the flange located in the peak side of the said embedded pillar which is H-shaped steel , the said cylindrical member is covered on the said embedded pillar. Alternatively, the buffer member may be fixed in advance to the flange located on the mountain side of the buried pillar, and the buried pillar may be installed on the concrete foundation.

この発明の防護柵とその施工方法によれば、コンクリート基礎に立設された既設の埋設柱を利用する等して支柱を簡単に形成することができ、支柱内の弾性体の緩衝部材の緩衝効果によって、落石による衝撃エネルギーを長期間にわたり連続的に効果的に吸収可能になり、防護柵施工地域の安全性をより高めることができる。また、予め所定形状に形成された固形物の緩衝部材を使用するため、支柱を形成する際に養生を行う工程が不要であり、工期の短縮を図ることができる。 According fences of the present invention and its construction method, and the like utilizing the existing embedded pillars erected on the concrete foundation can easily form a strut, shock cushioning member of the elastic member in the strut The effect makes it possible to absorb impact energy caused by falling rocks effectively over a long period of time, and can further enhance the safety of the protective fence construction area. In addition, since a solid cushioning member formed in a predetermined shape is used in advance, a curing step is not required when forming the support column, and the construction period can be shortened.

この発明の第一実施形態の防護柵を示す斜視図である。It is a perspective view which shows the guard fence of 1st embodiment of this invention. 第一実施形態の防護柵の支柱部分の断面図である。It is sectional drawing of the support | pillar part of the protection fence of 1st embodiment. 第一実施形態の支柱部分のＡ−Ａ断面図（ａ）、Ｂ−Ｂ断面図（ｂ）である。It is AA sectional drawing (a) and BB sectional drawing (b) of the support | pillar part of 1st embodiment. この発明の第二実施形態の支柱部分のＡ−Ａ断面図（ａ）、Ｂ−Ｂ断面図（ｂ）である。It is AA sectional drawing (a) and BB sectional drawing (b) of the support | pillar part of 2nd embodiment of this invention. その他の防護柵の実施形態の支柱部分のＡ−Ａ断面図（ａ）、Ｂ−Ｂ断面図（ｂ）である。A-A sectional view of the strut portion of an embodiment of other fences (a), a B-B sectional view (b).

以下、この発明の防護柵とその施工方法の第一実施形態について、図１〜図３に基づいて説明する。この実施形態の防護柵１０は、山間地の道路や線路等の山側斜面に設けられるもので、落石や雪崩を防止するために危険箇所に沿って設置される。図１に示すように、山側の斜面には断面が台形状のコンクリート基礎１２が設けられ、コンクリート基礎１２の上面１２ａに所定間隔で支柱１４が立設され、支柱１４に金網などのネット１６が張設されている。   Hereinafter, a first embodiment of a protective fence and its construction method according to the present invention will be described with reference to FIGS. The protective fence 10 of this embodiment is provided on mountain slopes such as roads and tracks in mountainous areas, and is installed along dangerous places to prevent falling rocks and avalanches. As shown in FIG. 1, a concrete foundation 12 having a trapezoidal cross section is provided on the slope on the mountain side, pillars 14 are erected on the upper surface 12a of the concrete foundation 12 at predetermined intervals, and a net 16 such as a wire mesh is provided on the pillar 14. It is stretched.

支柱１４は、図２、図３に示すように、コンクリート基礎１２に下端部が埋設された既設の埋設柱１８と、埋設柱１８の外側に隙間を空けて被せられ、下端部２０ａがコンクリート基礎１２の上面１２ａに固定された筒状部材２０とで構成されている。埋設柱１８は、１本のウェブと２本のフランジを有するＨ形鋼であり、一方のフランジが山の斜面と対向する向きに立設されている。筒状部材２０は、断面が略四角形で、埋設柱１８のコンクリート基礎１２からの突出長さよりも長い。   As shown in FIGS. 2 and 3, the support column 14 is covered with an existing embedded column 18 in which the lower end portion is embedded in the concrete foundation 12 and a gap between the outside of the embedded column 18, and the lower end portion 20 a is provided on the concrete foundation. And a cylindrical member 20 fixed to the upper surface 12a of the twelve. The buried pillar 18 is an H-shaped steel having one web and two flanges, and one flange is erected in a direction facing the slope of the mountain. The tubular member 20 has a substantially square cross section and is longer than the protruding length of the buried pillar 18 from the concrete foundation 12.

また、埋設柱１８の山側のフランジ１８ａの側面と筒状部材２０の山側の側面２０ｃの内側面との間には、予め工場等で施工用に定形に形成された緩衝部材である弾性体シート２４が配置されている。弾性体シート２４は、例えばシリコーン樹脂やゴム又は合成樹脂ゲル等の弾性を有した柔らかい素材で、所定厚さの薄板状に形成されたものである。筒状部材２０の基端側にはフランジ部２０ａが設けられ、フランジ部２０ａは、図示しないアンカー等によりコンクリート基礎１２の上面１２ａに固定されている。さらに、筒状部材２０の先端側の開口２０ｂは、防塵、防水用のキャップ２２で塞がれている。   An elastic sheet, which is a buffer member formed in advance in a factory or the like for construction, between the side surface of the flange 18a on the mountain side of the buried column 18 and the inner surface of the side surface 20c on the mountain side of the cylindrical member 20 24 is arranged. The elastic sheet 24 is a soft material having elasticity, such as silicone resin, rubber, or synthetic resin gel, and is formed into a thin plate having a predetermined thickness. A flange portion 20a is provided on the proximal end side of the tubular member 20, and the flange portion 20a is fixed to the upper surface 12a of the concrete foundation 12 by an anchor or the like (not shown). Further, the opening 20b on the distal end side of the cylindrical member 20 is closed with a dust-proof and waterproof cap 22.

各支柱１４の頂部間には、図１に示すように、隣接する支柱１４の頂部同士の間隔を一定に維持させる金属製の長尺材である上弦材２６が架設され、両端が支柱１４の上端に固定されている。さらに、支柱１４の上端部の山側の側面２０ｃには、支柱１４の頂部同士を連結した鋼線のワイヤロープ２８が架設されている。同様に、支柱１４の下端部の山側の側面２０ｃにも、支柱１４の基端部同士を連結したワイヤロープ３０が架設されている。ワイヤロープ２８，３０は、数本おきに支柱１４の上下端部に設けられた連結装置３２，３４によって両端部が連結されている。連結装置３２，３４は、ワイヤロープ２８，３０の両端部を保持し、所定以上の張力が加わると、ワイヤロープ２８，３０の長さ方向に摺動して衝撃を緩和させる装置である。連結装置３２，３４が設けられた一対の支柱１４の間にある他の支柱１４は、上下端部の山側の側面２０ｃにワイヤ挿通環３６が突設され、その中に挿通されたワイヤロープ２８，３０を摺動自在に保持している。   As shown in FIG. 1, an upper chord material 26, which is a long metal material that maintains a constant distance between the tops of adjacent struts 14, is installed between the tops of the struts 14. It is fixed at the top. Further, a steel wire rope 28 connecting the tops of the columns 14 is installed on the mountain side surface 20 c of the upper end of the column 14. Similarly, a wire rope 30 connecting the base end portions of the support column 14 is also installed on the side surface 20c on the mountain side of the lower end portion of the support column 14. Both ends of the wire ropes 28 and 30 are connected to each other by connecting devices 32 and 34 provided at the upper and lower ends of the column 14 every few. The connecting devices 32 and 34 are devices that hold both ends of the wire ropes 28 and 30 and, when a predetermined tension or more is applied, slide in the length direction of the wire ropes 28 and 30 to alleviate the impact. As for the other support | pillar 14 between a pair of support | pillars 14 with which the connection apparatuses 32 and 34 were provided, the wire insertion ring 36 is protrudingly provided by the side 20c of the mountain side of an upper-lower end part, and the wire rope 28 inserted in it 30 are slidably held.

クロスワイヤ３８は、ワイヤロープ２８，３０よりも太い鋼線により構成され、１本置きの支柱１４の上下端部の互いに対向する側面２０ｄに突設された連結部４０に、両端が連結されている。クロスワイヤ３８の中間部は、１本置きの中間部の支柱１４の山側の側面２０ｃに突設された一対のワイヤ挿通環３６に挿通されている。これにより、クロスワイヤ３０は、等辺の山形を描くように架設されている。   The cross wire 38 is made of a steel wire that is thicker than the wire ropes 28 and 30, and both ends are connected to a connecting portion 40 that protrudes from the opposite side surfaces 20 d of the upper and lower ends of every other column 14. Yes. The intermediate portion of the cross wire 38 is inserted into a pair of wire insertion rings 36 protruding from the side surface 20c on the mountain side of every other intermediate support column 14. Thereby, the cross wire 30 is constructed so as to draw an equilateral mountain shape.

クロスワイヤ３８の両端部には、ループ状緩衝装置４２が設けられている。ループ状緩衝装置４２は、クロスワイヤ３８の両端部を１回ループを描いて連結部４０に連結し、ループの交差部を一定の摩擦力で挟持した挟持部材を有し、さらに、クロスワイヤ３０が挟持部材を摺動してループが小さくなったときに、ループの途中で挟持部材に当接し、クロスワイヤ３８の摺動時の抵抗を増大させる摺動体を備えている。ループ状緩衝装置４２は、クロスワイヤ３８の両端部に所定以上の張力が加わると、クロスワーヤ３８のループが縮小するように挟持部材中で摺動し衝撃を緩和する装置である。クロスワイヤ３８は、図１に示すように、一対のクロスワイヤ３０が交差するように一対の支柱１４間に架設され、一対の支柱１４の上下に端部が連結されている。   At both ends of the cross wire 38, loop-shaped shock absorbers 42 are provided. The loop-shaped shock absorber 42 includes a clamping member that draws a loop once at both ends of the cross wire 38 and connects the cross wire 38 to the connecting portion 40, and holds the cross portion of the loop with a constant frictional force. Is provided with a sliding body that abuts the clamping member in the middle of the loop and increases the resistance when the cross wire 38 slides when the clamping member slides and the loop becomes small. The loop-shaped shock absorber 42 is a device that, when a predetermined tension or more is applied to both ends of the cross wire 38, slides in the holding member so as to reduce the loop of the cross wire 38 and reduces the impact. As shown in FIG. 1, the cross wire 38 is installed between the pair of support columns 14 so that the pair of cross wires 30 intersect with each other, and ends thereof are connected to the upper and lower sides of the pair of support columns 14.

金網等であるネット１６は、支柱１４の山側の側面２０ｃに対面して張設され、上下の端部が、金属製の柱状の間隔材４４の両端部に、固定金具を用いてワイヤロープ２８，３０と共に固定されている。間隔材４４は一対の支柱１４間に数本等間隔に配置されている。さらに、ネット１６のワイヤロープ２８，３０がない部分も同様に、固定金具を用いて間隔材４４に固定されている。   The net 16, which is a metal mesh or the like, is stretched so as to face the side surface 20 c on the mountain side of the support 14, and the upper and lower ends are attached to both ends of a metal columnar spacing member 44 using a fixing bracket. 30 are fixed together. Several spacing members 44 are arranged at equal intervals between the pair of support columns 14. Further, the portion of the net 16 where the wire ropes 28 and 30 are not provided is similarly fixed to the spacing member 44 using a fixing bracket.

この実施形態の防護柵１０の施工方法は、既設の埋設柱１８に筒状部材２０を被せて固定するもので、筒状部材２０を埋設柱１８に被せる際に、埋設柱１８の山側の側面と筒状部材２０の山側の側面２０ｃの内側面との間に、弾性体シート２４を挿入する。弾性体シート２４の挿入は、埋設柱１８に弾性体シート２４を貼り付けた後、筒状部材２０を埋設柱１８に被せても良く、逆に、埋設柱１８に筒状部材２０を被せた後、弾性体シート２４を、埋設柱１８と筒状部材２０の間に挿入しても良い。この後、筒状部材２０の基端側のフランジ部２０ａを、コンクリート基礎１２の上面１２ａに固定し、埋設柱１８のフランジ１８ａの側面と筒状部材２０の山側の側面２０ｃの内側面との間に弾性体シート２４を挟持させる。なお、新設の防護柵の場合、コンクリート基礎１２に埋設柱１８を立設する工程の後、上記と同様に施工しても良い。   The construction method of the protective fence 10 of this embodiment is to fix the existing embedded pillar 18 by covering the cylindrical member 20, and when covering the cylindrical member 20 on the embedded pillar 18, the side surface on the mountain side of the embedded pillar 18. The elastic sheet 24 is inserted between the inner side surface of the crest-side side surface 20 c of the cylindrical member 20. The elastic sheet 24 may be inserted by attaching the elastic member 24 to the embedded column 18 and then covering the cylindrical member 20 with the embedded column 18, or conversely, covering the embedded column 18 with the cylindrical member 20. Thereafter, the elastic sheet 24 may be inserted between the embedded column 18 and the tubular member 20. Thereafter, the flange portion 20a on the proximal end side of the cylindrical member 20 is fixed to the upper surface 12a of the concrete foundation 12, and the side surface of the flange 18a of the embedded column 18 and the inner side surface of the side surface 20c on the mountain side of the cylindrical member 20 are fixed. The elastic sheet 24 is sandwiched therebetween. In the case of a new protective fence, after the step of standing the buried pillar 18 on the concrete foundation 12, it may be constructed in the same manner as described above.

上記の構成を備えた防護柵１０は、山から落下してきた岩石がネット１６に衝突すると、岩石の衝突時の運動エネルギーにより、ネット１６、ワイヤロープ２８，３０及びクロスワイヤ３８が谷側に変形して引き延ばされ、クロスワイヤ３８両端のループ状緩衝装置４２及びワイヤロープ２８，３０両端の連結装置３２，３４の緩衝動作により、岩石の衝突エネルギーが吸収される。   When the rock falling from the mountain collides with the net 16, the protective fence 10 having the above configuration deforms the net 16, the wire ropes 28, 30 and the cross wire 38 to the valley side by the kinetic energy at the time of the rock collision. Thus, the impact energy of the rock is absorbed by the buffering action of the loop-like shock absorbers 42 at both ends of the cross wire 38 and the connecting devices 32, 34 at both ends of the wire ropes 28, 30.

さらに、ネット１６、ワイヤロープ２８，３０及びクロスワイヤ３８を介して支柱１４にも衝撃力が加わるが、支柱１４内部の弾性体シート２４が弾性変形し、岩石の衝突時の衝撃を吸収する。また、支柱１４に加わる力は、上弦材２６及びワイヤロープ２８，３０介して他の支柱１４にも伝わり分散されることによって、岩石の衝突時の衝撃が吸収される。   Furthermore, although an impact force is also applied to the support column 14 via the net 16, the wire ropes 28 and 30, and the cross wire 38, the elastic sheet 24 inside the support column 14 is elastically deformed and absorbs an impact at the time of a rock collision. Further, the force applied to the struts 14 is transmitted and dispersed to the other struts 14 through the upper chord material 26 and the wire ropes 28 and 30, so that the impact at the time of the collision of the rock is absorbed.

この実施形態の防護柵１０の施工方法によれば、コンクリート基礎１２に立設された既設の埋設柱１８を利用した簡単な構成の支柱１４でありながら、弾性体シート２４の緩衝効果によって、落石による衝撃エネルギーの吸収が可能になり、防護柵施工地域の安全性をより高めることができる。また、固形物の弾性体シート２４を使用するため、支柱１４を形成する際に養生を行う必要がなく、工期の大幅な短縮を図ることができる。   According to the construction method of the protective fence 10 of this embodiment, the rock fall is caused by the buffer effect of the elastic sheet 24 while being the strut 14 having a simple configuration using the existing buried pillar 18 erected on the concrete foundation 12. It is possible to absorb the impact energy by, and to further improve the safety of the protective fence construction area. Further, since the solid elastic sheet 24 is used, it is not necessary to perform curing when forming the support column 14, and the construction period can be greatly shortened.

次に、この発明の防護柵の第二実施形態について、図４に基づいて説明する。ここで、第一実施形態の防護柵１０と同様の構成は、同一の符号を付して説明を省略する。第二実施形態の防護柵１０は、緩衝部材である弾性体シート２４に代えて、板ばね４６が設けられている点で、第一実施形態の防護柵１０と構成が異なる。   Next, a second embodiment of the protective fence according to the present invention will be described with reference to FIG. Here, the same components as those of the protective fence 10 of the first embodiment are denoted by the same reference numerals and description thereof is omitted. The guard fence 10 of the second embodiment is different from the guard fence 10 of the first embodiment in that a leaf spring 46 is provided instead of the elastic sheet 24 that is a buffer member.

この支柱１４は、埋設柱１８の山側のフランジ１８ａの側面と筒状部材２０の山側の側面２０ｃの間に、緩衝部材である板ばね４６が配置されている。板ばね４６は、金属製の板を適宜の角度で僅かに屈折させ、厚み方向に弾発力を持たせたものである。支柱１４を組み立てる際は、まず、埋設柱１８に板ばね４６の端部を固定金具４６ａを用いて固定し、そこに筒状部材２０を被せ、筒状部材２０の基端側のフランジ部２０ａをアンカー等によりコンクリート基礎１２の上面１２ａに固定する。これによって、フランジ１８ａ側面と筒状部材２０の山側の側面２０ｃの内側面との間に板ばね４６が挟持された状態になる。   In this column 14, a leaf spring 46, which is a buffer member, is disposed between the side surface of the flange 18 a on the mountain side of the buried column 18 and the side surface 20 c on the mountain side of the cylindrical member 20. The leaf spring 46 is a metal plate that is slightly refracted at an appropriate angle and has a resilient force in the thickness direction. When assembling the column 14, first, the end of the leaf spring 46 is fixed to the embedded column 18 by using the fixing bracket 46 a, and the cylindrical member 20 is covered there, and the flange portion 20 a on the proximal end side of the cylindrical member 20. Is fixed to the upper surface 12a of the concrete foundation 12 with an anchor or the like. As a result, the leaf spring 46 is sandwiched between the side surface of the flange 18a and the inner side surface of the side surface 20c on the mountain side of the cylindrical member 20.

第二実施形態の防護柵１０は、上記第一実施形態の防護柵１０と同様の効果に加えて、予め工場等で、固定金具４６ａにより埋設柱１８に板ばね４６を固定した状態で、施工現場に設置することもでき、より施工工数を削減することができる。また、防護柵１０の緩衝機能の調整も、板バネ４６の厚み等により容易に細かく設定することができる。   In addition to the same effects as the protective fence 10 of the first embodiment, the protective fence 10 of the second embodiment is constructed in a state where the leaf spring 46 is fixed to the buried pillar 18 by a fixing bracket 46a in advance at a factory or the like. It can also be installed on site, and the number of construction steps can be further reduced. Also, the adjustment of the buffer function of the protective fence 10 can be easily and finely set by the thickness of the leaf spring 46 and the like.

次に、その他の防護柵の実施形態について、図５に基づいて説明する。ここで、第二実施形態の防護柵１０と同様の構成は、同一の符号を付して説明を省略する。この実施形態の防護柵１０は、緩衝部材である弾性体シート２４や板ばね４６に代えて、所定の流動性を備えた粒状体である砂４８が用いられている点で、第一及び第二実施形態の防護柵１０と構成が異なる。 Next, embodiments of other fences, will be described with reference to FIG. Here, the same components as those of the protective fence 10 of the second embodiment are denoted by the same reference numerals and description thereof is omitted. The protective fence 10 of this embodiment is the first and the second in that sand 48 which is a granular body having a predetermined fluidity is used instead of the elastic body sheet 24 and the leaf spring 46 which are buffer members. The configuration differs from that of the protective fence 10 of the second embodiment.

この支柱１４は、埋設柱１８の山側のフランジ１８ａの側面と筒状部材２０の山側の側面２０ｃに広く隙間を空けて配置され、埋設柱１８と筒状部材２０との隙間に砂４８が充填されている。砂４８は、表面の角が取れた砂粒の集合体であり、粒の表面の摩擦抵抗の具合により適度な流動性を備えている。支柱１４を組み立てるときは、まず、埋設柱１８に筒状部材２０を被せ、筒状部材２０の基端側のフランジ部２０ａをアンカー等によりコンクリート基礎１２の上面１２ａに固定する。そして、筒状部材２０先端側の開口２０ｂから砂４８を充填し、キャップ２２で塞ぐ。   This support column 14 is arranged with a wide gap between the side surface 20c of the mountain side flange 18a of the buried column 18 and the side surface 20c of the mountain side 20 of the cylindrical member 20, and the gap 48 between the buried column 18 and the cylindrical member 20 is filled with sand 48. Has been. The sand 48 is an aggregate of sand grains with a rounded surface, and has appropriate fluidity depending on the degree of frictional resistance on the surface of the grains. When assembling the column 14, first, the cylindrical member 20 is put on the buried column 18, and the flange portion 20a on the proximal end side of the cylindrical member 20 is fixed to the upper surface 12a of the concrete foundation 12 with an anchor or the like. Then, the sand 48 is filled from the opening 20 b on the distal end side of the cylindrical member 20 and is closed with the cap 22.

この実施形態の防護柵１０は、弾性体シート２４で吸収しきれない強い衝撃エネルギーが想定される場合に適しており、支柱１４に対して山側から谷側に向けての衝撃だけでなく、ネット１６等に引っ張られる斜め方向の衝撃に対しても一定の緩衝性が得られる。 The protective fence 10 of this embodiment is suitable when strong impact energy that cannot be absorbed by the elastic sheet 24 is assumed, and not only the impact from the mountain side to the valley side with respect to the support 14 but also the net. A certain level of shock-absorbing property can be obtained even in the case of an impact in an oblique direction pulled by 16 or the like.

なお、この発明の防護柵は上記実施形態に限定されるものではなく、支柱の施工は、新設または既設の支柱に適用可能なものであり、特に埋設柱の更新時等に広く適宜適用可能なものである。   The protective fence according to the present invention is not limited to the above embodiment, and the construction of the support column can be applied to a newly installed or existing support column, and can be widely applied as appropriate especially when the buried column is updated. Is.

また、緩衝部材は、入手が容易なゴムシート部材などを用いるとよい。また、筒状部材の形状や素材、ネットの形態（ワイヤロープ、クロスワイヤの有無も含む）についても同様に、施工場所ごとに必要な衝撃吸収性能に鑑みて、適宜選択又は変更することができる。 Also, the buffer member, may obtain the Ru with easiness rubber sheet member. Similarly, the shape and material of the cylindrical member, and the form of the net (including the presence or absence of a wire rope and a cross wire) can be selected or changed as appropriate in view of the shock absorbing performance required for each construction site. .

１０ 防護柵
１２ コンクリート基礎
１４ 支柱
１６ ネット
１８ 埋設柱
２０ 筒状部材
２４ 弾性体シート DESCRIPTION OF SYMBOLS 10 Guard fence 12 Concrete foundation 14 Prop 16 Net 18 Buried pillar 20 Cylindrical member 24 Elastic body sheet

Claims (5)

山間地の山側斜面に設置されたコンクリート基礎と、前記コンクリート基礎の上面に立設された複数の支柱と、前記複数の支柱の間に張設されたネットとを備えた防護柵において、
前記支柱は、前記コンクリート基礎に下端部が埋設された埋設柱と、前記埋設柱の外側に隙間を空けて被せられ下端部が前記コンクリート基礎の上面に固定された筒状部材とで構成され、前記埋設柱は、２本のフランジが山の斜面に対向する向きに立設されたＨ形鋼であり、前記筒状部材の内側面には平坦部が設けられ、前記埋設柱の山側に位置したフランジと前記筒状部材の前記平坦部との間に、予め所定形状に形成され弾性変形により衝撃を吸収する弾性体の固形物である緩衝部材を設けたことを特徴とする防護柵。 In a protective fence provided with a concrete foundation installed on a mountain side slope in a mountainous area, a plurality of pillars erected on the upper surface of the concrete foundation, and a net stretched between the plurality of pillars,
The strut is composed of an embedded column in which a lower end portion is embedded in the concrete foundation, and a tubular member that is covered with a gap on the outside of the embedded column and the lower end portion is fixed to the upper surface of the concrete foundation, The buried pillar is an H-shaped steel in which two flanges are erected in a direction facing a slope of a mountain, and a flat portion is provided on the inner surface of the cylindrical member, and is located on the mountain side of the buried pillar. between the flanges of the flat portion of the tubular member, the safety barrier, characterized in that a buffer member is a solid elastic body to absorb the impact by previously formed into a predetermined shape elastic deformation. 山間地の山側斜面にコンクリート基礎を施工し、前記コンクリート基礎の上面に複数の支柱を立設し、前記複数の支柱の間にネットを張設する防護柵の施工方法において、
前記コンクリート基礎に下端部が埋設された埋設柱の外側に、所定の隙間を空けて筒状部材を被せ、前記筒状部材を前記埋設柱に被せる際又はその前後に、少なくとも前記埋設柱の山側の側面と前記筒状部材の山側の内側面との間に、予め所定形状に形成され弾性変形により衝撃を吸収する弾性体の固形物である緩衝部材を設けることを特徴とする防護柵の施工方法。 In the construction method of the protective fence in which the concrete foundation is constructed on the mountain side slope of the mountainous area, a plurality of columns are erected on the upper surface of the concrete foundation, and a net is stretched between the plurality of columns.
A cylindrical member is placed outside the buried pillar, the lower end of which is buried in the concrete foundation, with a predetermined gap, and when the tubular member is placed on the buried pillar, or before and after that, at least on the mountain side of the buried pillar Construction of a protective fence characterized in that a buffer member, which is a solid body of an elastic body that is formed in advance in a predetermined shape and absorbs an impact by elastic deformation , is provided between the side surface of the cylindrical member and the inner side surface on the mountain side of the cylindrical member Method. 前記緩衝部材は、ゴム又はゲルから成る弾性体シートであり、Ｈ形鋼である前記埋設柱の山側に位置するフランジと前記筒状部材の平坦部とが対面する間隙に前記緩衝部材を挿入する請求項２記載の防護柵の施工方法。 The buffer member is an elastic sheet made of rubber or gel, and the buffer member is inserted into a gap between a flange located on the mountain side of the buried pillar made of H-shaped steel and a flat portion of the cylindrical member. The construction method of the protection fence of Claim 2. 前記緩衝部材は、板ばねであり、Ｈ形鋼である前記埋設柱の山側に位置するフランジに前記緩衝部材を固定した後、前記筒状部材を前記埋設柱に被せる請求項２記載の防護柵の施工方法。 3. The protective fence according to claim 2, wherein the buffer member is a leaf spring, and the buffer member is covered with the cylindrical member after the buffer member is fixed to a flange located on a mountain side of the embedded column that is H-shaped steel. Construction method. 前記緩衝部材は、板ばねであり、Ｈ形鋼である前記埋設柱の山側に位置するフランジに前記緩衝部材を予め固定し、前記コンクリート基礎に前記埋設柱を設置する請求項２記載の防護柵の施工方法。 3. The protective fence according to claim 2, wherein the buffer member is a leaf spring, the buffer member is fixed in advance to a flange located on a mountain side of the embedded column that is H-shaped steel, and the embedded column is installed on the concrete foundation. Construction method.
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