JP6219049B2 - Fall bridge prevention device - Google Patents

Fall bridge prevention device Download PDF

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JP6219049B2
JP6219049B2 JP2013070176A JP2013070176A JP6219049B2 JP 6219049 B2 JP6219049 B2 JP 6219049B2 JP 2013070176 A JP2013070176 A JP 2013070176A JP 2013070176 A JP2013070176 A JP 2013070176A JP 6219049 B2 JP6219049 B2 JP 6219049B2
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loop
prevention device
covering
shape
connecting body
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JP2013227857A (en
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友亮 木作
友亮 木作
隆一 山口
隆一 山口
司 岩本
司 岩本
雅人 渡口
雅人 渡口
雅博 上田
雅博 上田
初美 岩崎
初美 岩崎
中村　善彦
善彦 中村
一夫 松本
一夫 松本
福井　敦史
敦史 福井
史朗 齊藤
史朗 齊藤
裕 道脇
裕 道脇
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Next Innovation GK
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Description

本発明は、高架道路、河川、渓谷等における橋梁構造物において、橋桁が地震時の振動等によって落下することを防止する落橋防止装置に関する。   The present invention relates to a bridge failure prevention device for preventing a bridge girder from dropping due to vibrations during an earthquake in a bridge structure on an elevated road, a river, a valley, and the like.

近年、落橋防止装置を構成する連結部材として、ループ状に形成されたベルトから成る連結ベルトが採用されることが増えている。このような連結ベルトを用いた落橋防止装置の利点としては、金属等から構成される鋼製の落橋防止装置に比して軽量で製造作業や施工作業等の作業性が良いことやより安価に製造可能であることなどが挙げられる。これらのような利点を持った落橋防止装置としては、特許文献１や特許文献２に記載の技術を挙げることが出来る。   In recent years, a connecting belt composed of a belt formed in a loop shape has been increasingly used as a connecting member constituting the fallen bridge prevention device. The advantages of such a fallen bridge prevention device using a connecting belt include a lighter weight and better workability such as manufacturing work and construction work, and lower cost compared to a steel fallen bridge prevention device made of metal or the like. For example, it can be manufactured. Examples of the bridge failure prevention device having the advantages as described above include the techniques described in Patent Document 1 and Patent Document 2.

特許文献１には、ループ状のベルトを用いた連結バンドで構成された落橋防止装置が記載されている。特に、この特許文献１では、チューブ状のカバーで繊維が被覆される構成が記載されている。しかしながら、この特許文献１に記載の技術では、チューブに繊維を複数回挿通させる必要があり、その巻回作業が極めて煩雑である。また、完成したベルトは、ループ状を成すものの、纏まりが悪く、橋梁への設置作業や運搬においては不便であり、作業性が良いとは言えないものである。   Japanese Patent Application Laid-Open No. H10-228667 describes a falling bridge prevention device configured by a connection band using a loop belt. In particular, Patent Document 1 describes a configuration in which fibers are covered with a tube-shaped cover. However, in the technique described in Patent Document 1, it is necessary to pass the fiber through the tube a plurality of times, and the winding operation is extremely complicated. Further, although the completed belt is in a loop shape, the belt is poorly bundled and is inconvenient in installation work and transportation to the bridge, and cannot be said to have good workability.

特許文献２には、ループ状のベルトの中間部を、剛性を有する保護カバーで被覆し、垂れ下がりを防止する構成が記載されている。従って、特許文献２に記載の技術では、保護カバーが剛性を有するため、撓むことが出来ず、取付作業時等の取り扱いが極めて不便である。また、取付対象である橋桁等は、温度変化によって伸縮するものであるが、特許文献２は、可撓性を有しないことから、橋桁等の伸縮に十分追従することが出来ない虞もある。   Patent Document 2 describes a configuration in which an intermediate portion of a loop-shaped belt is covered with a rigid protective cover to prevent drooping. Therefore, in the technique described in Patent Document 2, since the protective cover has rigidity, it cannot be bent, and handling at the time of mounting work is extremely inconvenient. Moreover, although the bridge girder etc. which are attachment objects expand and contract by a temperature change, since patent document 2 does not have flexibility, there exists a possibility that it cannot fully follow expansion / contraction of a bridge girder.

特開２００６−２４９８４２号公報JP 2006-249842 A 特開２００８−２６６９７０号公報JP 2008-266970 A

本発明は、以上のような問題点に鑑みて成されたものであり、軽量で作業性が良く、製造が容易で安価でありながら、容易に橋梁に設置することが出来、橋桁の伸縮に十分に追従可能で高度な耐候性を有する落橋防止装置を提供することを目的とする。   The present invention has been made in view of the above problems, and can be easily installed on a bridge while being lightweight, good in workability, easy to manufacture, and inexpensive. It is an object of the present invention to provide a falling bridge prevention device that can sufficiently follow and has high weather resistance.

本発明に係る落橋防止装置は、対象物に設置された状態において、橋桁が落下することを防止するものである。前記落橋防止装置は、可撓性を有するループ状の連結体と、前記ループ状の連結体の中間部を被覆し結束する可撓性を有する中間部用被覆体と、前記ループ状の連結体の前記中間部用被覆体の両側に形成された小ループ部を被覆する端部用被覆体とを備え、前記ループ状の連結体の中間部には、前記連結体と別体であり、幅方向に撓み難く、厚さ方向若しくは面外方向に撓み易い中間部用補強材が配設されていることを備えている。
また、前記落橋防止装置は、可撓性を有するループ状の連結体と、前記ループ状の連結体の中間部を被覆し結束する可撓性を有する中間部用被覆体と、前記ループ状の連結体の前記中間部用被覆体の両側に形成された小ループ部を被覆する端部用被覆体と、前記ループ状の連結体の一方の中間部と他方の中間部との間に設けられ、該ループ状の連結体の形状を保持する形状保持部材を備えている。 The falling bridge prevention device according to the present invention prevents a bridge girder from dropping when it is installed on an object. The fallen bridge prevention device includes a flexible loop-shaped coupling body, a flexible intermediate portion covering body that binds and binds an intermediate portion of the loop-shaped coupling body, and the loop-shaped coupling body. And an end covering for covering the small loop portion formed on both sides of the intermediate covering, and the intermediate portion of the loop-shaped connecting body is separate from the connecting body and has a width. It is provided with an intermediate reinforcing member that is difficult to bend in the direction and is easily bent in the thickness direction or the out-of-plane direction.
The fallen bridge prevention device includes a flexible loop-shaped connecting body, a flexible intermediate covering body that covers and binds an intermediate portion of the loop-shaped connecting body, and the loop-shaped connecting body. Provided between the end cover for covering the small loop portion formed on both sides of the intermediate cover of the connecting body, and one intermediate portion and the other intermediate portion of the loop-shaped connecting body. And a shape holding member for holding the shape of the loop-shaped connecting body.

前記ループ状の連結体は、長尺体を一周以上巻回して構成され、前記端部用被覆体に前記長尺体が挿通され、前記長尺体の端部を長尺体の一部に固定して構成することが出来る。前記中間部用被覆体及び／又は前記端部用被覆体は、長尺体を結束し、且つ、紫外線や損傷等の外的要因等から長尺体或いは連結体を保護するものであって、熱収縮性チューブを用いることが出来る。   The loop-shaped connecting body is formed by winding the long body one or more times, the long body is inserted into the end covering body, and the end of the long body is used as a part of the long body. Can be fixed and configured. The cover for intermediate part and / or the cover for end part binds the long body and protects the long body or the connection body from external factors such as ultraviolet rays and damage, A heat-shrinkable tube can be used.

また、前記ループ状の連結体の両側に形成された小ループ部には、該小ループ部に挿設される円柱や角柱、板状或いは円筒状等の芯やピン等の定着体の外周形状に対応する形状の端部用補強材を配設することも出来る。   In addition, the small loop portions formed on both sides of the loop-shaped connecting body include the outer peripheral shape of a fixing body such as a cylinder or prism, a plate-shaped or cylindrical core, or a pin inserted into the small-loop portion. It is also possible to dispose an end reinforcing material having a shape corresponding to.

また、前記小ループ部において前記長尺体同士が成す層間には、低摩擦性を有する低摩擦面状体が配設され、長尺体の摺動性を向上させる。   Further, a low-friction surface-like body having a low friction property is disposed between the layers formed by the long bodies in the small loop portion, thereby improving the slidability of the long body.

更に、前記形状保持部材は、前記ループ状の連結体の一方の中間部と他方の中間部との間に複数個設けられるようにしても良い。これにより、形状保持部材自体は非可撓性の材料で形成されていても、全体として可撓性を有するようになり、ループ状の連結体の形状を保持しつつ、製造作業や施工作業等の作業性を向上させることが出来、また、桁の伸縮に対応させることが可能となる。 Furthermore, a plurality of the shape holding members may be provided between one intermediate portion and the other intermediate portion of the loop-shaped connecting body. As a result, even if the shape holding member itself is formed of an inflexible material, it has flexibility as a whole, and the manufacturing operation, the construction operation, etc. Workability can be improved, and it is possible to cope with expansion and contraction of girders.

更に、前記形状保持部材は、前記小ループ部が半円状又はＵ字状に形成されるように、厚肉に設けられるようにしても良い。これにより、小ループ部の中間部側が絞られることによってループ状の連結体を構成する各層の帯状長尺体間に内外径差（隙間）が出来て、ループ状の連結体に弛みや緩みが発生することを防止することが出来る。   Furthermore, the shape holding member may be provided thick so that the small loop portion is formed in a semicircular shape or a U shape. As a result, the middle portion side of the small loop portion is squeezed to create a difference in inner and outer diameters (gap) between the belt-like long members of each layer constituting the loop-like connected body, and the loop-like connected body is loosened or loosened. It can be prevented from occurring.

更に、前記形状保持部材は、前記ループ状の連結体の長手方向の一方の側面に凸円弧状の凸円弧部が設けられ、他方の側面に該一方の側面の凸円弧部に対応する凹円弧状の凹円弧部が設けられるようにしても良い。これにより、形状保持部材を隣接する互いの側面が当接するように配置しても、平面状の側面を当接する場合よりも、全体としてより可撓性を有するようになり、ループ状の連結体の形状を保持しつつ、製造作業や施工作業等の作業性を向上させることが出来る。   Further, the shape maintaining member is provided with a convex arc-shaped convex arc portion on one side surface in the longitudinal direction of the loop-shaped connecting body, and a concave circle corresponding to the convex arc portion on the one side surface on the other side surface. An arcuate concave arc portion may be provided. As a result, even if the shape holding members are arranged so that the adjacent side surfaces are in contact with each other, they are more flexible as a whole than in the case where the planar side surfaces are in contact, and the loop-shaped coupling body. It is possible to improve workability such as manufacturing work and construction work while maintaining the shape.

本発明では、可撓性を有するループ状連結体の一部を接合部としているだけなので全体として可撓性を有している。従って、本発明の落橋防止装置を橋桁間に取り付ける場合や橋桁と橋台或いは橋脚との間に取り付ける場合にも、本発明の落橋防止装置が撓むことで、取付作業を行うことが容易となり、作業効率の向上を図ることが出来る。また、ループ状連結体の中間部が中間部用被覆体で被覆されているだけなので可撓性を保持しながら軽量な物とすることが可能である。   In the present invention, since only a part of the flexible loop-like coupling body is used as a joint portion, the whole has flexibility. Therefore, when the fall prevention device of the present invention is attached between the bridge girders or when it is installed between the bridge girder and the abutment or the pier, the fall prevention device of the present invention is bent, so that it is easy to perform the installation work. The work efficiency can be improved. Further, since the intermediate part of the loop-shaped connecting body is only covered with the covering part for the intermediate part, it is possible to reduce the weight while maintaining flexibility.

更に、ループ状連結体の全体が可撓性を有することで、橋桁や橋台、橋脚に設置されるブラケット間に取り付けられ架設された状態においても、弛んだ状態とすることが出来、橋桁等の温度等による伸縮にも十分に追従することが出来る。更に、ループ状連結体は、その巻き数を一重、二重、三重、四重・・・と増やすことで、引張強度を調整することが可能で、容易に地震時許容荷重を高めていくことが出来る。   Furthermore, since the whole loop-shaped connecting body is flexible, it can be in a slack state even when it is mounted between a bridge girder, an abutment, and a bracket installed on a pier, such as a bridge girder. Can fully follow expansion and contraction due to temperature and the like. Furthermore, by increasing the number of windings of the loop-shaped connected body as single, double, triple, quadruple, etc., it is possible to adjust the tensile strength and easily increase the allowable load during an earthquake. I can do it.

本発明を適用した落橋防止装置の使用状態を示す斜視図である。It is a perspective view which shows the use condition of the falling bridge prevention apparatus to which this invention is applied. 本発明を適用した落橋防止装置の他の使用状態を示す側面図である。It is a side view which shows the other use condition of the fallen bridge prevention apparatus to which this invention is applied. 本発明を適用した落橋防止装置の斜視図である。It is a perspective view of a fallen bridge prevention device to which the present invention is applied. 熱収縮前のチューブ状の端部用被覆体に原反より引き出された長尺の連結体を挿入する状態を示す斜視図である。It is a perspective view which shows the state which inserts the elongate coupling body pulled out from the original fabric to the tube-shaped edge part covering body before heat contraction. ループ状連結体に接合部を形成した状態を示す平面図である。It is a top view which shows the state which formed the junction part in the loop-shaped coupling body. （Ａ）−（Ｄ）は、ループ状連結体の構造を示す断面図である。(A)-(D) is sectional drawing which shows the structure of a loop-shaped coupling body. （Ａ）はループ状連結体の接合部の斜視図であり、（Ｂ）はループ状連結体の接合部に枠体を取り付ける状態を示す斜視図である。(A) is a perspective view of the junction part of a loop connection body, (B) is a perspective view which shows the state which attaches a frame to the junction part of a loop connection body. （Ａ）及び（Ｂ）は、接合部の枠体の変形例を示す断面図であり、（Ｃ）及び（Ｄ）は、型を用いて接合部の周囲に保護層を設ける例を示す断面図である。(A) And (B) is sectional drawing which shows the modification of the frame of a junction part, (C) And (D) is a cross section which shows the example which provides a protective layer around a junction part using a type | mold. FIG. ループ状連結体に中間部用被覆体を挿入する状態を示す斜視図である。It is a perspective view which shows the state which inserts the cover part for intermediate parts in a loop-shaped coupling body. （Ａ）及び（Ｂ）は、ループ部に端部用補強材が取り付けられた状態を示す平面図である。(A) And (B) is a top view which shows the state by which the reinforcement material for edge parts was attached to the loop part. 落橋防止装置の取付方法を示す斜視図である。It is a perspective view which shows the attachment method of a falling bridge prevention apparatus. ループ状連結体の中間部間に形状保持部材を設ける落橋防止装置の変形例を示す断面図である。It is sectional drawing which shows the modification of the fall-bridge prevention apparatus which provides a shape holding member between the intermediate parts of a loop-shaped coupling body. 形状保持部材をループ状連結体の長さ方向に複数個配置する形状保持部材の変形例を示す断面図である。It is sectional drawing which shows the modification of the shape holding member which arranges multiple shape holding members in the length direction of a loop-shaped coupling body. ループ状連結体の中間部間に厚肉の形状保持部材を設ける落橋防止装置の変形例を示す断面図である。It is sectional drawing which shows the modification of the fall-bridge prevention apparatus which provides a thick shape holding member between the intermediate parts of a loop-shaped coupling body. 厚肉の形状保持部材をループ状連結体の長さ方向に複数個配置する形状保持部材の変形例を示す断面図である。It is sectional drawing which shows the modification of the shape holding member which arranges two or more thick shape holding members in the length direction of a loop-shaped coupling body. 厚肉の形状保持部材の側面に凸円弧部と凹円弧部とを設けた形状保持部材の変形例を示す断面図である。It is sectional drawing which shows the modification of the shape holding member which provided the convex circular arc part and the concave circular arc part in the side surface of the thick shape holding member. ループ状連結体が一本の平紐状の長尺な繊維束がループ状に複数回巻回されることで構成された落橋防止装置の変形例を示す斜視図である。It is a perspective view which shows the modification of the fall-bridge prevention apparatus comprised by the loop-shaped coupling body being wound in the loop shape several times by the flat fiber-like long fiber bundle. 繊維束を示す断面図である。It is sectional drawing which shows a fiber bundle. 巻回された繊維束を示す断面図である。It is sectional drawing which shows the wound fiber bundle.

以下、本発明が適用された落橋防止装置について図面を参照して説明する。なお、以下、落橋防止装置について、以下の順に沿って説明する。   Hereinafter, a fallen bridge prevention device to which the present invention is applied will be described with reference to the drawings. Hereinafter, the fallen bridge prevention device will be described in the following order.

１．落橋防止装置の使用状態の説明
２．落橋防止装置の構成の説明
３．落橋防止装置の製造方法の説明
４．落橋防止装置の取付方法の説明
５．落橋防止装置の効果の説明
６．落橋防止装置の第一の変形例の説明
７．落橋防止装置の第二の変形例の説明 1. 1. Explanation of the state of use of the fallen bridge prevention device 2. Description of the structure of the falling bridge prevention device 3. Description of the manufacturing method of the falling bridge prevention device 4. Explanation of installation method of the fallen bridge prevention device 5. Explanation of effect of falling bridge prevention device 6. Description of the first modification of the fallen bridge prevention device Explanation of the second modification of the falling bridge prevention device

［１．落橋防止装置の使用状態の説明］
図１に示すように、本発明が適用された落橋防止装置１０は、コンクリート床版橋等の第一の橋桁１と第二の橋桁２とが橋脚３に設置された状態において、一端側が第一の橋桁１に取り付けられ、他端側が第一の橋桁１に隣接する第二の橋桁２に取り付けられ、第一の橋桁１と第二の橋桁２とを連結する。この落橋防止装置１０は、橋桁１，２を支承する支承装置や橋桁の変位量を制限する変位制限装置が大規模地震等の大きな振動によって破損した際などに、橋桁１，２が橋台や橋脚３等から落下することを防止する。また、図２に示すように、落橋防止装置１０は、第一の橋桁１又は第二の橋桁２と橋台や橋脚３等との間を連結し、第一の橋桁１又は第二の橋桁２が橋台や橋脚３等から落下することを防止する。 [1. Explanation of the usage state of the fallen bridge prevention device]
As shown in FIG. 1, in the state where the first bridge girder 1 and the second bridge girder 2 such as a concrete floor slab bridge are installed on the bridge pier 3, the one end side is the first one. It is attached to one bridge girder 1 and the other end is attached to a second bridge girder 2 adjacent to the first bridge girder 1 to connect the first bridge girder 1 and the second bridge girder 2. This falling bridge prevention device 10 is used when the supporting device for supporting the bridge girders 1 and 2 and the displacement limiting device for restricting the displacement amount of the bridge girder are damaged by a large vibration such as a large-scale earthquake or the like. Prevents falling from 3rd magnitude. Moreover, as shown in FIG. 2, the falling bridge prevention apparatus 10 connects between the 1st bridge girder 1 or the 2nd bridge girder 2, and the abutment, the pier 3 etc., and the 1st bridge girder 1 or the 2nd bridge girder 2 is provided. Is prevented from falling from the abutment or pier 3 etc.

［２．落橋防止装置の構成の説明］
図３に示すように、落橋防止装置１０は、多重のループ状連結体１１を形成し、ループ状連結体１１の中間部を、中間部用被覆体１２で被覆して結束し、更に、ループ状連結体１１の両側の小ループ部１３，１３を端部用被覆体１４，１４で被覆して結束して成る。 [2. Description of the structure of the fallen bridge prevention device]
As shown in FIG. 3, the falling bridge prevention device 10 forms a multiple loop-like connecting body 11, covers and binds an intermediate portion of the loop-like connecting body 11 with an intermediate portion covering body 12, and further loops The small loop portions 13 and 13 on both sides of the link body 11 are covered and bound with end coverings 14 and 14.

ループ状連結体１１を構成する帯状長尺体１１ａは、図４に示すように、縦糸の束を並べ横糸で固定した長さ方向の引張強度が高い繊維を使用しており、ここでは、引張材として衝撃緩和能力を持つアラミド繊維を用いている。なお、帯状長尺体１１ａとしては、この他、炭素繊維、ポリエステル繊維、ポリビニルアルコール繊維等を用いても良いし、これらの中の少なくとも複数を混合して用いても良い。このような長尺の帯状長尺体１１ａは、複数回掛け回される。ここでは、例えば六重程度巻回される。そして、図５に示すように、巻回された帯状長尺体１１ａの内側端部１６ａと外側端部１６ｂとを含む部分が接着剤１７ａ等で固定され、これにより、ループ状連結体１１が形成される。すなわち、接合部１７は、ループの内側に位置する帯状長尺体１１ａの一方の端部１６ａとループの外側に位置する他方の端部１６ｂの位置が積層方向において所定長以上の重なり領域を以て配置され、両端部１６ａ，１６ｂを含んで積層された帯状長尺体１１ａの重なり領域において隣接する層同士が接着剤１７ａによって固定されることで構成される。ループ状連結体１１は、アラミド繊維等を巻回して成るものであるから、全体としても可撓性を有すると共に、長さ方向の引張強度が高い特性を有する。   As shown in FIG. 4, the belt-like long body 11a constituting the loop-like connecting body 11 uses fibers having high tensile strength in the length direction in which bundles of warp yarns are arranged and fixed with weft yarns. Aramid fiber with impact mitigation ability is used as the material. In addition, as the strip-shaped long body 11a, carbon fiber, polyester fiber, polyvinyl alcohol fiber, or the like may be used, or at least a plurality of these may be mixed and used. Such a long belt-like long body 11a is wound around a plurality of times. Here, for example, about sixfolds are wound. And as shown in FIG. 5, the part containing the inner side edge part 16a and the outer side edge part 16b of the strip | belt-shaped elongate body 11a wound is fixed with the adhesive agent 17a etc., and, thereby, the loop-shaped connection body 11 is attached. It is formed. That is, the joining portion 17 is arranged with an overlapping region in which the position of one end portion 16a of the strip-shaped elongated body 11a located inside the loop and the other end portion 16b located outside the loop is a predetermined length or more in the stacking direction. In the overlapping region of the strip-shaped elongated bodies 11a laminated including both end portions 16a and 16b, adjacent layers are fixed by an adhesive 17a. Since the loop-like connecting body 11 is formed by winding an aramid fiber or the like, the loop-like connecting body 11 has flexibility as a whole and high tensile strength in the length direction.

なお、ループ状連結体１１は、複数回巻回するのではなく、一重のものであっても良い。また、ループ状連結体１１は、例えば全体が八の字状に捻れていても良いし、ループ状連結体１１を構成する帯状長尺体１１ａが捻れていても良い。例えば、帯状長尺体１１ａの内周側の端部と外周側の端部とを重ね合わせるように捻らせても良い。   In addition, the loop-shaped connection body 11 may not be wound several times but may be a single one. Moreover, the loop-shaped connection body 11 may be twisted, for example, in the shape of an eight figure as a whole, or the strip-shaped long body 11a constituting the loop-shaped connection body 11 may be twisted. For example, you may twist so that the inner peripheral side edge part and outer peripheral side edge part of the strip | belt-shaped elongate body 11a may overlap.

また、帯状長尺体１１ａを複数回巻回する場合には、小ループ部１３，１３において、複数の巻回によって重なり合う各帯状長尺体１１ａ同士の間に、帯状長尺体１１ａの幅と同程度の幅と、小ループ部１３，１３の周長程度以下の長さを有するポリテトラフルオロエチレン等の低摩擦性材料から成るシート材、すなわち低摩擦面状体（図示省略）を配設させることが出来、こうすることで、帯状長尺体１１ａを複数回巻回することによって構成されたループ状連結体１１に、引張力が作用した際に、重なり合った帯状長尺体１１ａの全ての層が互いに摺動しながら均一に引張され、応力が均等に掛かるようになり、ループ状連結体１１全体として高度な引張強度は発揮させることが可能となる。   Further, when the strip-shaped long body 11a is wound a plurality of times, in the small loop portions 13 and 13, the width of the strip-shaped long body 11a is defined between the strip-shaped long bodies 11a overlapping each other by the plurality of windings. A sheet material made of a low-friction material such as polytetrafluoroethylene having the same width and a length equal to or less than the circumference of the small loop portions 13 and 13, that is, a low-friction surface-like body (not shown) is provided. In this way, when a tensile force is applied to the loop-like connecting body 11 formed by winding the belt-like long body 11a a plurality of times, all of the overlapping belt-like long bodies 11a are overlapped. These layers are uniformly pulled while sliding on each other, and stress is applied evenly, and the loop-like connecting body 11 as a whole can exhibit a high tensile strength.

ループ状連結体１１の中間部には、図３に示すように、ループ状連結体１１の中間部を結束して保護する中間部用被覆体１２が配設されている。この中間部用被覆体１２は、ループ状連結体１１の可撓性を損なわない可撓性を有している。また、この中間部用被覆体１２は、落橋防止装置１０が長期間外部に設置されることに鑑み紫外線保護機能を有している。このような特性を有する中間部用被覆体１２は、例えば、熱収縮性チューブが用いられ、熱収縮前に、ループ状連結体１１の一端側より挿入された後、ループ状連結体１１の中間部で、熱収縮され、ループ状連結体１１の中間部を結束し保護する。この熱収縮性チューブとしては、例えば、絶縁や耐熱特性、また防水・防食性に優れたエチレンプロピレンゴムによって構成されたものを用いることが出来る。   As shown in FIG. 3, an intermediate portion covering body 12 that binds and protects the intermediate portion of the loop-like connecting body 11 is disposed at the intermediate portion of the loop-like connecting body 11. The intermediate portion covering body 12 has flexibility that does not impair the flexibility of the loop-shaped connecting body 11. Further, the intermediate covering 12 has an ultraviolet protection function in view of the fact that the falling bridge prevention device 10 is installed outside for a long period of time. For example, a heat-shrinkable tube is used as the intermediate-part covering body 12 having such characteristics, and after being inserted from one end side of the loop-shaped connecting body 11 before the heat shrinking, the middle of the loop-shaped connecting body 11 is used. The portion is heat-shrinked and binds and protects the intermediate portion of the loop-like connecting body 11. As this heat-shrinkable tube, for example, a tube made of ethylene-propylene rubber having excellent insulation and heat resistance characteristics and water / corrosion resistance can be used.

なお、中間部用被覆体１２としては、熱収縮性チューブ以外のものを用いて、ループ状連結体１１の中間部分を結束するようにしても良い。   In addition, you may make it bind the intermediate part of the loop-shaped coupling body 11 using the thing other than a heat-shrinkable tube as the intermediate body covering body 12.

ループ状連結体１１は、中間部を中間部用被覆体１２で被覆し結束すると、その両側に、小ループ部１３，１３が形成される。ループ状連結体１１の両側の小ループ部１３，１３にも、小ループ部１３，１３を結束し保護する端部用被覆体１４，１４が配設される。端部用被覆体１４，１４は、小ループ部１３，１３の可撓性を損なわないような可撓性を有している。また、端部用被覆体１４，１４は、落橋防止装置１０が長期間外部に設置されることに鑑み紫外線保護機能を有している。このような特性を有する端部用被覆体１４，１４は、例えば、熱収縮性チューブが用いられ、熱収縮前に、長尺の帯状長尺体１１ａが何重も挿入された後、熱収縮されることで、小ループ部１３，１３を結束し保護する。この熱収縮性チューブとしては、例えば、絶縁や耐熱特性、また防水・防食性に優れたエチレンプロピレンゴムによって構成されたものを用いることが好ましい。   When the intermediate part is covered with the intermediate part covering body 12 and bound, the loop-shaped connecting body 11 is formed with small loop parts 13 and 13 on both sides thereof. Also on the small loop portions 13, 13 on both sides of the loop-shaped connecting body 11, end coverings 14, 14 that bind and protect the small loop portions 13, 13 are disposed. The end coverings 14 and 14 have flexibility so as not to impair the flexibility of the small loop portions 13 and 13. Further, the end coverings 14 and 14 have an ultraviolet protection function in view of the fact that the falling bridge prevention device 10 is installed outside for a long period of time. For the end coverings 14 and 14 having such characteristics, for example, a heat-shrinkable tube is used, and before the heat-shrinkage, a number of the long strip-like long bodies 11a are inserted, and then heat-shrink. As a result, the small loop portions 13 and 13 are bound and protected. As this heat-shrinkable tube, for example, it is preferable to use a tube made of ethylene propylene rubber having excellent insulation and heat resistance characteristics, and water / corrosion resistance.

なお、端部用被覆体１４，１４としては、熱収縮性チューブ以外のものを用いて、小ループ部１３，１３を結束するようにしても良い。   In addition, as the coverings 14 and 14 for ends, the small loop portions 13 and 13 may be bundled by using things other than the heat-shrinkable tube.

中間部用被覆体１２と端部用被覆体１４，１４とは、同じ材質の熱収縮性チューブを用いたときには、一度の加熱工程で、熱収縮性チューブを収縮させて、帯状長尺体１１ａを結束することが出来、製造工程の効率化を図ることが出来る。また、中間部用被覆体１２と端部用被覆体１４，１４との間は、隙間があっても良いし、隙間が無くても良いが、アラミド繊維が紫外線に弱い特性を有することに鑑み隙間を設けないことが好ましい。勿論、この隙間を別の部材で被覆するときには、中間部用被覆体１２と端部用被覆体１４，１４との間に隙間があっても良い。更に、中間部用被覆体１２と端部用被覆体１４，１４とは、必ずしも熱収縮性チューブである必要ないが、熱収縮性チューブである方が帯状長尺体１１ａがしっかりと結束されるため、作業性の向上を図ることが出来る。また、中間部用被覆体１２、端部用被覆体１４，１４の何れか一方のみを熱収縮性チューブとしても良い。また、中間部用被覆体１２と端部用被覆体１４，１４とは、一連のチューブ体を用いても良い。   When the heat-shrinkable tube of the same material is used for the intermediate cover 12 and the end cover 14, 14, the heat-shrinkable tube is shrunk in a single heating step, and the strip-shaped elongated body 11 a. Can be bundled, and the efficiency of the manufacturing process can be improved. In addition, there may be a gap or no gap between the intermediate covering 12 and the end coverings 14, 14, but in view of the fact that aramid fibers have a characteristic of being susceptible to ultraviolet rays. It is preferable not to provide a gap. Of course, when this gap is covered with another member, there may be a gap between the intermediate covering 12 and the end coverings 14, 14. Furthermore, the intermediate covering 12 and the end coverings 14 and 14 do not necessarily have to be heat-shrinkable tubes, but the belt-like long body 11a is more firmly bound by the heat-shrinkable tubes. Therefore, workability can be improved. Further, only one of the intermediate covering member 12 and the end covering members 14 and 14 may be a heat-shrinkable tube. Moreover, a series of tube bodies may be used for the intermediate covering member 12 and the end covering members 14 and 14.

ループ状連結体１１の両側に形成された小ループ部１３，１３は、端部用被覆体１４，１４の外側に更に端部用補強材２６，２６が配設される。図１に示すように、第一の橋桁１と第二の橋桁２との間を連結し、又は、図２に示すように、第一の橋桁１又は第二の橋桁２と橋台若しくは橋脚３等との間を連結する。落橋防止装置１０が連結する橋桁１，２間又は橋桁１，２と橋脚３の間には、落橋防止装置１０を取り付けるためのブラケット４，４が設けられており、小ループ部１３，１３には、ブラケット４，４に取り付けるための定着体である定着ピン５，５が挿通される（図１、図２、図１１参照）。そこで、小ループ部１３，１３には、図１０（Ａ）に示すように、端部用被覆体１４，１４の更に外側に端部用補強材２６，２６が配設される。端部用補強材２６，２６は、例えば、小ループ部１３，１３の内周側に配設されるものであり、定着ピン５，５が接する内周面が定着ピン５，５の外形形状に対応した曲面となっている。これにより、小ループ部１３，１３には、端部用補強材２６，２６によって、定着ピン５，５から荷重が加わった際、荷重が均一になり、また、定着ピン５，５との摩擦を軽減することが出来る。   The small loop portions 13, 13 formed on both sides of the loop-shaped connecting body 11 are further provided with end reinforcing members 26, 26 outside the end coverings 14, 14. As shown in FIG. 1, the first bridge girder 1 and the second bridge girder 2 are connected, or as shown in FIG. 2, the first bridge girder 1 or the second bridge girder 2 and the abutment or pier 3. Etc. are connected. Between the bridge girders 1 and 2 to which the falling bridge prevention device 10 is connected, or between the bridge girders 1 and 2 and the pier 3, brackets 4 and 4 for attaching the falling bridge prevention device 10 are provided. Are inserted through the fixing pins 5 and 5 which are fixing members to be attached to the brackets 4 and 4 (see FIGS. 1, 2 and 11). Therefore, as shown in FIG. 10 (A), end reinforcing members 26, 26 are disposed on the outer side of the end coverings 14, 14 in the small loop portions 13, 13. The end reinforcements 26 and 26 are disposed, for example, on the inner peripheral side of the small loop portions 13 and 13, and the inner peripheral surface with which the fixing pins 5 and 5 are in contact is the outer shape of the fixing pins 5 and 5. It is a curved surface corresponding to. As a result, when the load is applied to the small loop portions 13 and 13 from the fixing pins 5 and 5 by the end reinforcing members 26 and 26, the load becomes uniform and the friction with the fixing pins 5 and 5 is increased. Can be reduced.

なお、小ループ部１３，１３には、図１０（Ｂ）に示すように、端部用補強材２６，２６の他に、更に小ループ部１３，１３の外周側を覆う端部用補強材２７，２７を設けるようにしても良い。   In addition, as shown in FIG. 10 (B), the small loop portions 13 and 13 include an end portion reinforcing material that covers the outer peripheral side of the small loop portions 13 and 13 in addition to the end reinforcing members 26 and 26. 27 and 27 may be provided.

［３．落橋防止装置の製造方法の説明］
図４に示すように、熱収縮前のチューブ状の端部用被覆体１４ａ，１４ａを用意し、原反より引き出されたアラミド繊維等の長尺の帯状長尺体１１ａを挿通し、例えば、六回挿通することで、図５に示すように、六重のループを形成し、内側に位置する端部１６ａと外側に位置する端部１６ｂとの位置を、積層方向において所定長以上、好ましくは１００ｍｍ以上の重なり領域が出来るように位置合わせする。次いで、位置が合わせられた内側の端部１６ａ、外側の端部１６ｂ、及び端部１６ａ，１６ｂ間の帯状長尺体１１ａの層には、熱硬化型接着剤等の接着剤１７ａが含浸されて接合され、断面が矩形状の接合部１７が形成される。すなわち、この接合部１７は、内側の端部１６ａと外側の端部１６ｂとその間の帯状長尺体１１ａとを接着剤１７ａによって一体化し、ループ状連結体１１を形成する。 [3. Explanation of manufacturing method of fallen bridge prevention device]
As shown in FIG. 4, tube-shaped end coverings 14a and 14a before heat shrinkage are prepared, and a long strip-shaped long body 11a such as an aramid fiber drawn out from a raw fabric is inserted, for example, As shown in FIG. 5, a six-fold loop is formed by inserting six times, and the positions of the end portion 16a located on the inner side and the end portion 16b located on the outer side are preferably a predetermined length or more in the stacking direction. Are aligned so that an overlapping area of 100 mm or more is formed. Next, the inner end portion 16a, the outer end portion 16b, and the layer of the strip-shaped long body 11a between the end portions 16a and 16b are impregnated with an adhesive 17a such as a thermosetting adhesive. To form a joint 17 having a rectangular cross section. That is, the joining portion 17 forms the loop-shaped connecting body 11 by integrating the inner end portion 16a, the outer end portion 16b, and the belt-like long body 11a therebetween with the adhesive 17a.

なお、接着剤１７ａを含浸させた後加圧したときには、隣接する帯状長尺体１１ａ間の接着力を向上させることが出来る。このように設けられたループ状連結体１１は、小ループ部１３，１３を形成した際に中間部を構成する相対する直線部を構成する帯状長尺体１１ａの枚数が同じにされ、相対する直線部の強度が同じになるように構成される。   In addition, when it pressurizes after impregnating the adhesive agent 17a, the adhesive force between the adjacent strip | belt-shaped elongate bodies 11a can be improved. In the loop-shaped connecting body 11 provided in this way, when the small loop portions 13 and 13 are formed, the number of the strip-like long bodies 11a constituting the opposing straight portions constituting the intermediate portion is made the same and opposed. It is comprised so that the intensity | strength of a straight part may become the same.

一般に、アラミド繊維は、縦糸の束を並べそれら縦糸を横糸で固定した繊維シートであって、横糸の数が少なく、幅方向にばらけ易い。接合部１７では、糸を用いて内側の端部１６ａと外側の端部１６ｂとその間の帯状長尺体１１ａとを縫い込んで一体化するのではなく、接着剤１７ａを用いて一体化しているので、縫い込みの場合より強固にアラミド繊維を一体化出来、アラミド繊維がばらけてしまうことを防止することが出来る。また、接合部１７は、ループ状連結体１１の一部分に設けられるだけであるから、ループ状連結体１１の全体には可撓性を持たせながら、端部１６ａ，１６ｂとその間の帯状長尺体１１ａとを強力に一体化することが出来る。   In general, an aramid fiber is a fiber sheet in which a bundle of warp yarns are arranged and the warp yarns are fixed with weft yarns. In the joint portion 17, the inner end portion 16a, the outer end portion 16b, and the belt-like long body 11a therebetween are not sewn and integrated using a thread, but are integrated using an adhesive 17a. Therefore, the aramid fibers can be integrated more firmly than in the case of sewing, and the aramid fibers can be prevented from being scattered. Further, since the joint portion 17 is only provided in a part of the loop-like connecting body 11, the end portions 16a and 16b and the belt-like long portion therebetween are provided while the entire loop-like connecting body 11 is flexible. The body 11a can be strongly integrated.

なお，接着剤１７ａとしては、繊維強化プラスチック（Fiber Reinforced Plastics、FRP）を用いても良い。また、接着剤１７ａを用いるほか、接着テープやボルト／ナットやブラインドリベット等を用いて接合するようにしても良い。   As the adhesive 17a, fiber reinforced plastics (FRP) may be used. Further, in addition to using the adhesive 17a, bonding may be performed using an adhesive tape, a bolt / nut, a blind rivet, or the like.

ここで、図６に示すように、ループ状連結体１１は、更に、中間部用補強材１８を用いて強度補強をするようにしても良い。ここで、中間部用補強材１８は、例えば、ポリプロピレンやウレタンゴムと言った樹脂材料の幅方向に撓み難く、厚さ方向（面外方向）に撓み易い長尺部材が用いられる。中間部用補強材１８の厚さは、例えば３ｍｍ程度である。このような中間部用補強材１８は、図６（Ａ）に示すように、例えば、二重のループ状連結体１１とする場合には、帯状長尺体１１ａの層間に、中間部用補強材１８を介在させるようにしても良い。また、図６（Ｂ）に示すように、ループ状連結体１１が一重の場合には、帯状長尺体１１ａを一対の中間部用補強材１８，１８で挟み込むようにしても良い。更に、図６（Ｃ）に示すように、帯状長尺体１１ａを多重とした場合、ループ状連結体１１は、帯状長尺体１１ａの間に、中間部用補強材１８を介在させ、最外層と最内層とが中間部用補強材１８，１８となるようにしても良い。更に、これとは逆に、図６（Ｄ）に示すように、中間部用補強材１８を帯状長尺体１１ａ，１１ａの間に介在させたときには、最外層と最内層とが帯状長尺体１１ａ，１１ａとなるようにしても良い。   Here, as shown in FIG. 6, the loop-shaped connecting body 11 may be further reinforced by using an intermediate reinforcing member 18. Here, as the reinforcing member 18 for the intermediate portion, for example, a long member that is not easily bent in the width direction of a resin material such as polypropylene or urethane rubber and is easily bent in the thickness direction (out-of-plane direction) is used. The thickness of the intermediate reinforcing member 18 is, for example, about 3 mm. As shown in FIG. 6 (A), for example, when the intermediate portion reinforcing member 18 is a double loop-like connecting body 11, the intermediate portion reinforcing member 18 is interposed between the layers of the belt-like long body 11a. The material 18 may be interposed. In addition, as shown in FIG. 6B, when the loop-shaped connecting body 11 is single, the belt-like long body 11a may be sandwiched between a pair of intermediate reinforcements 18,18. Furthermore, as shown in FIG. 6 (C), when the strip-shaped long bodies 11a are multiplexed, the loop-shaped connecting body 11 interposes the middle portion reinforcing member 18 between the strip-shaped long bodies 11a, and is The outer layer and the innermost layer may be the intermediate reinforcing members 18, 18. Further, on the contrary, as shown in FIG. 6D, when the intermediate reinforcing member 18 is interposed between the strip-shaped elongated bodies 11a, 11a, the outermost layer and the innermost layer are strip-shaped long. You may make it become the bodies 11a and 11a.

なお、図６（Ａ）−（Ｄ）に示すような補強材は、ループ状連結体１１の中間部のみに設けても良いが、更に、小ループ部１３，１３となる部分にも図６（Ａ）−（Ｄ）に示すような補強材を設けても良い。この場合、補強材は、ループ状の一連の部材を用いても良いし、中間部とループ部とで別のものを用いても良い。   6 (A) to 6 (D) may be provided only in the middle part of the loop-like connecting body 11, but also in the parts that become the small loop parts 13 and 13, FIG. You may provide a reinforcing material as shown to (A)-(D). In this case, as the reinforcing material, a series of loop-shaped members may be used, or different members may be used for the intermediate portion and the loop portion.

また、接合部１７は、図７（Ａ）に示すように、接着剤１７ａを用いて、端部１６ａ，１６ｂとこれらの間の帯状長尺体１１ａ及び／又は中間部用補強材１８とを一体化しても良いが、更に、図７（Ｂ）に示すように、枠体１９を用いて、接合部１７を保護し、更に強固に接合するようにしても良い。図７（Ｂ）の枠体１９は、金属板や樹脂板を用いて成型された断面略コ字状の第一枠部材１９ａと第二枠部材１９ｂとを有し、第一枠部材１９ａ又は第二枠部材１９ｂの一方が他方に嵌合する構成となっている。なお、第一枠部材１９ａや第二枠部材１９ｂは、鋳物や切削加工品であっても良い。また、第一枠部材１９ａと第二枠部材１９ｂの側壁の間隔は、接合部１７の幅寸法とほぼ一致するように形成されている。また、第一枠部材１９ａと第二枠部材１９ｂの側壁には、これらを結合するボルトやナットやリベット等の固定部材１９ｃが挿入される貫通孔１９ｄ，１９ｄが形成されている。第一枠部材１９ａ、第二枠部材１９ｂの何れかの凹部に接着剤１７ａが含浸された接合部１７が配置されると、次いで、第一枠部材１９ａと第二枠部材１９ｂとが嵌合され、更に、貫通孔１９ｄ，１９ｄに固定部材１９ｃ，１９ｃが固定される。この際、第一枠部材１９ａと第二枠部材１９ｂの主面部は、接合部１７を厚さ方向から加圧する。これにより、帯状長尺体１１ａの層間が密着されるだけでなく、帯状長尺体１１ａが積層された接合部１７と第一枠部材１９ａと第二枠部材１９ｂとが一体化される。これにより、接合部１７は、枠体１９に囲まれることで、保護されると共に、強固なものとなる。   Further, as shown in FIG. 7A, the joining portion 17 uses an adhesive 17a to connect the end portions 16a and 16b and the belt-like long body 11a and / or the intermediate portion reinforcing member 18 therebetween. Although it may be integrated, as shown in FIG. 7B, a frame 19 may be used to protect the bonding portion 17 and to bond it more firmly. The frame 19 in FIG. 7B includes a first frame member 19a and a second frame member 19b having a substantially U-shaped cross section formed using a metal plate or a resin plate, and the first frame member 19a or One of the second frame members 19b is configured to fit into the other. The first frame member 19a and the second frame member 19b may be castings or cut products. Further, the interval between the side walls of the first frame member 19 a and the second frame member 19 b is formed so as to substantially coincide with the width dimension of the joint portion 17. Further, through holes 19d and 19d into which fixing members 19c such as bolts, nuts, rivets and the like for connecting these are inserted are formed in the side walls of the first frame member 19a and the second frame member 19b. When the joint 17 impregnated with the adhesive 17a is disposed in any recess of the first frame member 19a and the second frame member 19b, the first frame member 19a and the second frame member 19b are then fitted. Furthermore, fixing members 19c and 19c are fixed to the through holes 19d and 19d. At this time, the main surface portions of the first frame member 19a and the second frame member 19b pressurize the joint portion 17 from the thickness direction. Thereby, not only the layers of the strip-shaped long body 11a are brought into close contact with each other, but also the joint portion 17, the first frame member 19a, and the second frame member 19b on which the strip-shaped long body 11a is laminated are integrated. Accordingly, the joint portion 17 is protected by being surrounded by the frame body 19 and becomes strong.

なお、第一枠部材１９ａと第二枠部材１９ｂとの嵌合は、接着剤１７ａが硬化した後に行っても良いが、未硬化のときに行うことが好ましい。これにより、帯状長尺体１１ａと第一枠部材１９ａと第二枠部材１９ｂとも接着剤１７ａによって一体化されるからである。また、接着剤１７ａが未硬化のときに枠体を設けたときには、接着剤１７ａが硬化するまでの間加圧し続ける必要がなくなり、生産効率の向上を図ることが出来る。   The fitting of the first frame member 19a and the second frame member 19b may be performed after the adhesive 17a is cured, but is preferably performed when the adhesive 17a is not cured. Thereby, the strip-shaped long body 11a, the first frame member 19a, and the second frame member 19b are also integrated by the adhesive 17a. Further, when the frame is provided when the adhesive 17a is uncured, it is not necessary to continue the pressurization until the adhesive 17a is cured, and the production efficiency can be improved.

また、枠体１９としては、図８に示すように構成することも出来る。図８（Ａ）では、枠部材２１ａに接合部１７が配置される凹部２１ｃを形成し、この凹部２１ｃを平板の蓋体２１ｂで閉塞し、枠部材２１ａの鍔部２１ｅと蓋体２１ｂの周囲とをボルトやナットやリベット等の固定部材２１ｄで結合する。これにより、接合部１７を枠部材２１ａと蓋体２１ｂとで加圧することが出来、接合部１７と枠部材２１ａ及び蓋体２１ｂとを一体化することが出来る。   Further, the frame body 19 can be configured as shown in FIG. In FIG. 8 (A), the frame member 21a is formed with a recess 21c in which the joint portion 17 is disposed, and the recess 21c is closed with a flat lid 21b, and the periphery of the flange 21e and the lid 21b of the frame member 21a. Are coupled by a fixing member 21d such as a bolt, nut or rivet. Thereby, the junction part 17 can be pressurized with the frame member 21a and the lid body 21b, and the junction part 17, the frame member 21a, and the lid body 21b can be integrated.

また、図８（Ｂ）に示すように、第一枠部材２２ａと第二枠部材２２ｂのそれぞれに、鍔部２２ｃ，２２ｄを形成し、一方の凹部２２ｅに接合部１７を配置し、他方の凹部２２ｆで接合部１７を閉塞する。この後、鍔部２２ｃ，２２ｄとをボルトやナットやリベット等の固定部材２２ｇで結合する。これにより、接合部１７を第一枠部材２２ａと第二枠部材２２ｂとで加圧することが出来、接合部１７と第一枠部材２２ａと第二枠部材２２ｂとを一体化することが出来る。   Further, as shown in FIG. 8B, the flange portions 22c and 22d are formed in each of the first frame member 22a and the second frame member 22b, the joint portion 17 is disposed in one recess 22e, and the other The joint 17 is closed by the recess 22f. Thereafter, the flange portions 22c and 22d are coupled with a fixing member 22g such as a bolt, a nut or a rivet. Thereby, the junction part 17 can be pressurized with the 1st frame member 22a and the 2nd frame member 22b, and the junction part 17, the 1st frame member 22a, and the 2nd frame member 22b can be integrated.

以上の図７（Ｂ）及び図８（Ａ）及び（Ｂ）では、接合部１７を枠体で保護し強固にする例を説明したが、樹脂や金属板の枠体を用いるだけでなく、接合部１７の周囲に保護層２０を設けるようにしても良い。すなわち、図８（Ｃ）では、成形凹部２３ａを有する第一成形型２３ｂと成形凹部２３ｃを有する第二成形型２３ｄとによって接合部１７の周囲に保護層２０を成形する。すなわち、成形凹部２３ａ，２３ｃに接合部１７が配置され、第一成形型２３ｂと第二成形型２３ｄが型締めされた状態で、繊維強化プラスチックといった溶融樹脂が成形凹部２３ａ，２３ｃに注入され、固化した後離型することも可能である。これにより、接合部１７の周囲には、保護層２０が形成されることになり、接合部１７は、保護層２０によって保護され強固なものとなる。   7 (B) and 8 (A) and (B) described the example in which the joint portion 17 is protected and strengthened by the frame body, but not only the frame body of resin or metal plate is used, A protective layer 20 may be provided around the joint portion 17. That is, in FIG. 8C, the protective layer 20 is molded around the joint portion 17 by the first molding die 23b having the molding recess 23a and the second molding die 23d having the molding recess 23c. That is, a molten resin such as fiber reinforced plastic is injected into the molding recesses 23a and 23c in a state where the joint 17 is disposed in the molding recesses 23a and 23c and the first molding die 23b and the second molding die 23d are clamped. It is possible to release after solidification. Thereby, the protective layer 20 is formed around the joint portion 17, and the joint portion 17 is protected by the protective layer 20 and becomes strong.

なお、成形金型は、図８（Ｄ）に示すように、第一成形型２３ｂの成形凹部２３ａの大きさを、接合部１７の一面を除く面を収納する大きさとし、第二成形型２３ｄは、平板状としても良い。図８（Ｃ）及び（Ｄ）に示すように、成形型２３ｂ，２３ｄを用いたときには、接合部１７の周囲に図８（Ａ）及び図８（Ｂ）に示すような鍔部２１ｅ，２２ｃ，２２ｄが無く、形状を矩形状にし簡素化することが出来る。また、図示しないが、接合部１７は、結束バンドで帯状長尺体１１ａを結束して構成しても良い。   As shown in FIG. 8D, in the molding die, the size of the molding concave portion 23a of the first molding die 23b is set to a size that accommodates the surface excluding one surface of the joining portion 17, and the second molding die 23d. May be flat. As shown in FIGS. 8C and 8D, when the molds 23b and 23d are used, the flanges 21e and 22c as shown in FIGS. 8A and 8B are formed around the joint portion 17. 22d and the shape can be simplified to be rectangular. Moreover, although not shown in figure, the junction part 17 may bind and comprise the strip | belt-shaped elongate body 11a with a binding band.

以上のように、端部用被覆体１４，１４が挿入され接合部１７が形成されたループ状連結体１１には、次いで、図９に示すように、熱収縮前のチューブ状の中間部用被覆体１２ａが挿入され、熱収縮前の端部用被覆体１４ａ，１４ａの間に位置される。上述のように、中間部用被覆体１２ａ及び端部用被覆体１４ａ，１４ａは、熱収縮性チューブである。熱収縮前の中間部用被覆体１２ａ及び端部用被覆体１４ａ，１４ａが挿入されたループ状連結体１１は、熱収縮前の中間部用被覆体１２ａ及び端部用被覆体１４ａ，１４ａを構成する熱収縮性チューブがドライヤ、ヒータ、電気炉、トーチランプ、ガスバーナ等の加熱器具を用いて、加熱されることで熱収縮される。これにより、多重のループ状連結体１１は、中間部が中間部用被覆体１２によって結束される。更に、中間部用被覆体１２の両側には、中間部用被覆体１２が熱収縮され、中間部の帯状長尺体１１ａが結束されることで、小ループ部１３，１３が形成される。端部用被覆体１４，１４も、熱収縮することで、小ループ部１３，１３を構成する多重の帯状長尺体１１ａを結束する。   As described above, in the loop-shaped connecting body 11 in which the end coverings 14 and 14 are inserted and the joint portion 17 is formed, as shown in FIG. The covering 12a is inserted and positioned between the end coverings 14a and 14a before the heat shrinkage. As described above, the intermediate covering member 12a and the end covering members 14a and 14a are heat-shrinkable tubes. The loop-shaped connecting body 11 into which the intermediate covering member 12a and the end covering members 14a and 14a before heat shrinkage are inserted includes the intermediate covering member 12a and the end covering members 14a and 14a before heat shrinking. The heat-shrinkable tube is heat-shrinked by being heated using a heating device such as a dryer, a heater, an electric furnace, a torch lamp, or a gas burner. As a result, in the multiple loop-shaped connecting body 11, the intermediate part is bound by the intermediate part covering body 12. Further, on both sides of the intermediate covering member 12, the intermediate covering member 12 is thermally contracted, and the belt-like long member 11a in the intermediate portion is bound to form the small loop portions 13 and 13. The end coverings 14 and 14 are also thermally contracted to bind the multiple strip-like long bodies 11a constituting the small loop portions 13 and 13 together.

なお、中間部用被覆体１２と端部用被覆体１４，１４の加熱処理は、同時に行っても良いし、別に行っても良い。別に行うときには、中間部用被覆体１２を熱収縮させてから、端部用被覆体１４，１４を熱収縮させても良いし、端部用被覆体１４，１４を熱収縮させてから、中間部用被覆体１２を熱収縮させても良い。また、中間部用被覆体１２及び端部用被覆体１４，１４が熱収縮した後においては、紫外線保護の観点から中間部用被覆体１２及び端部用被覆体１４，１４に隙間がないことが好ましい。中間部用被覆体１２及び端部用被覆体１４，１４は、一連のチューブ体を用いても良い。   Note that the heat treatment of the intermediate covering member 12 and the end covering members 14 and 14 may be performed simultaneously or separately. When performing separately, the intermediate cover 12 may be thermally contracted, and then the end cover 14, 14 may be thermally contracted, or the end cover 14, 14 may be thermally contracted and then the intermediate cover 12, 14. The covering 12 for a part may be heat shrunk. In addition, after the intermediate covering 12 and the end coverings 14 and 14 are thermally shrunk, there is no gap between the intermediate covering 12 and the end coverings 14 and 14 from the viewpoint of UV protection. Is preferred. A series of tube bodies may be used for the intermediate covering member 12 and the end covering members 14 and 14.

小ループ部１３，１３は、図１及び図２に示すように、ブラケット４，４の定着ピン５，５が挿入される部分である。従って、小ループ部１３，１３の内周面は、定着ピン５，５が圧接される部分となる。そこで、図１０（Ａ）に示すように、小ループ部１３，１３の内周面には、端部用補強材２６，２６が配設される。端部用補強材２６，２６は、機械的強度の高い合成樹脂や金属板で形成されており、全体がＣ字状に形成されている。端部用補強材２６，２６は、Ｃ字の内周側の面２６ａ，２６ａがブラケット４，４の定着ピン５，５と圧接する面となるため、定着ピン５，５の外形形状に対応した長さ方向が曲面で形成されている。また、端部用補強材２６，２６は、Ｃ字の外周側の面が小ループ部１３，１３の内周面が係合される凹部２６ｂ，２６ｂとなる。   As shown in FIGS. 1 and 2, the small loop portions 13 and 13 are portions into which the fixing pins 5 and 5 of the brackets 4 and 4 are inserted. Accordingly, the inner peripheral surfaces of the small loop portions 13 and 13 are portions where the fixing pins 5 and 5 are pressed. Therefore, as shown in FIG. 10A, end reinforcing members 26 and 26 are disposed on the inner peripheral surfaces of the small loop portions 13 and 13. The end reinforcements 26 and 26 are made of a synthetic resin or a metal plate having high mechanical strength, and are formed in a C shape as a whole. The end reinforcing members 26, 26 correspond to the outer shape of the fixing pins 5, 5 because the C-shaped inner peripheral surfaces 26a, 26a are the surfaces that come into pressure contact with the fixing pins 5, 5 of the brackets 4, 4. The length direction is formed with a curved surface. Further, in the end reinforcing members 26 and 26, the C-shaped outer peripheral surface becomes the concave portions 26b and 26b with which the inner peripheral surfaces of the small loop portions 13 and 13 are engaged.

このような端部用補強材２６，２６は、凹部２６ｂ，２６ｂを小ループ部１３，１３の内周面を係合させ、接着剤で固定され、及び／又は、凹部２６ｂ，２６ｂの開口端に形成された弾性係合片を小ループ部１３，１３の側面の係合部に係合させることによって取り付けられる。このような端部用補強材２６，２６は、定着ピン５，５との圧力を均一にしながら、小ループ部１３，１３が定着ピン５，５との摩擦により損傷することを防止することが出来る。すなわち、端部用補強材２６，２６は、定着ピン５，５との緩衝材として機能する。   Such end reinforcing members 26, 26 engage the inner peripheral surfaces of the small loop portions 13, 13 with the concave portions 26b, 26b, and are fixed with an adhesive, and / or open ends of the concave portions 26b, 26b. Are attached by engaging the elastic engagement pieces formed on the side surface with the engagement portions on the side surfaces of the small loop portions 13 and 13. Such end reinforcing members 26 and 26 can prevent the small loop portions 13 and 13 from being damaged by friction with the fixing pins 5 and 5 while making the pressure with the fixing pins 5 and 5 uniform. I can do it. That is, the end reinforcements 26 and 26 function as cushioning materials for the fixing pins 5 and 5.

なお、小ループ部１３，１３には、図１０（１３）に示すように、外周側に、更なる端部用補強材２７，２７を取り付けるようにしても良い。この場合、端部用補強材２７，２７は、Ｃ字状に形成され、その内周側に、小ループ部１３，１３の外周面に係合される凹部２７ａ，２７ａが形成される。端部用補強材２７，２７は、凹部２７ａ，２７ａの開口端に形成された弾性係合片を端部用補強材２６，２６の凹部２６ｂ，２６ｂの開口端の係合部や小ループ部１３，１３の側面の係合部に係合させることによって小ループ部１３，１３の外周面に取り付けられる。勿論、端部用補強材２７，２７は、接着剤で小ループ部１３，１３の外周面に固定するようにしても良い。また、このような補強材（保護カバー）を、更に中間部の中間部用被覆体１２上に設けるようにしても良い。   Further, as shown in FIG. 10 (13), further end reinforcing members 27 and 27 may be attached to the small loop portions 13 and 13 on the outer peripheral side. In this case, the end reinforcing members 27 and 27 are formed in a C shape, and concave portions 27a and 27a engaged with the outer peripheral surfaces of the small loop portions 13 and 13 are formed on the inner peripheral side thereof. The end reinforcing members 27, 27 are formed by using elastic engagement pieces formed at the opening ends of the recesses 27 a, 27 a as engaging portions or small loop portions at the opening ends of the recesses 26 b, 26 b of the end reinforcing members 26, 26. The small loop portions 13 and 13 are attached to the outer peripheral surfaces by engaging with the engaging portions on the side surfaces of the 13 and 13. Of course, the end reinforcements 27 and 27 may be fixed to the outer peripheral surfaces of the small loop portions 13 and 13 with an adhesive. Moreover, you may make it provide such a reinforcing material (protective cover) on the intermediate | middle part covering body 12 of an intermediate part further.

［４．落橋防止装置の取付方法の説明］
以上のような落橋防止装置１０は、図１１に示すように取り付けられる。ここでは、図１に示す第一の橋桁１と第二の橋桁２とを連結する場合を例に説明する。先ず、橋桁１，２に固定されるブラケット４，４は、金属製であり、橋桁１，２にボルトやナットを用いて又は溶接により固定される。ブラケット４，４には、落橋防止装置１０が取り付けられる一対の取付板４ａ，４ａが離間して形成されている。取付板４ａ，４ａには、定着ピン５，５が挿通される挿通孔５ａ，５ａが軸線を一致させて形成されている。なお、橋桁１の挿通孔５ａと橋桁２の挿通孔５ａとの距離は、２５００〜４５００ｍｍであり、落橋防止装置１０もこれに合わせた全長若しくは、橋桁等の伸縮を考慮した弛みを持たせるように、これよりやや長く形成されている。 [4. Explanation of installation method of fallen bridge prevention device]
The falling bridge prevention device 10 as described above is attached as shown in FIG. Here, the case where the 1st bridge girder 1 and the 2nd bridge girder 2 which are shown in FIG. 1 are connected is demonstrated to an example. First, the brackets 4 and 4 fixed to the bridge girders 1 and 2 are made of metal, and are fixed to the bridge girders 1 and 2 by using bolts or nuts or by welding. The brackets 4 and 4 are formed with a pair of mounting plates 4a and 4a to which the falling bridge prevention device 10 is mounted. The mounting plates 4a and 4a are formed with insertion holes 5a and 5a through which the fixing pins 5 and 5 are inserted so that their axes coincide with each other. In addition, the distance between the insertion hole 5a of the bridge girder 1 and the insertion hole 5a of the bridge girder 2 is 2500 to 4500 mm, and the falling bridge prevention device 10 also has a slack considering the expansion and contraction of the bridge girder etc. according to this. Moreover, it is formed slightly longer than this.

そして、落橋防止装置１０の一方の小ループ部１３は、橋桁１のブラケット４の取付板４ａ，４ａ間に挿入され、他方の小ループ部１３は、橋桁２のブラケット４の取付板４ａ，４ａ間に挿入される。この後、定着ピン５，５が挿通孔５ａ，５ａと小ループ部１３，１３に挿通され、一対の取付板４ａ，４ａに固定される。これにより、落橋防止装置１０は、ブラケット４，４の定着ピン５，５間に架け渡されることになる。なお、上述した端部用補強材２６，２７は、既に、小ループ部１３，１３に取り付けられた状態で、現場に運搬されても良いし、現場で取り付けられるようにしても良い。また、端部用補強材２６，２６と定着ピン５，５との間には、更に緩衝材となる例えばゴム等の弾性体で形成されたブッシュを介在させても良い。また、定着ピン５，５となる定着体は、小ループ部１３，１３に挿設される円柱や角柱、板状或いは円筒状等の芯やピン等であれば特に限定されるものではない。   Then, one small loop portion 13 of the falling bridge prevention device 10 is inserted between the mounting plates 4a and 4a of the bracket 4 of the bridge girder 1, and the other small loop portion 13 is mounted on the mounting plates 4a and 4a of the bracket 4 of the bridge girder 2. Inserted between. Thereafter, the fixing pins 5 and 5 are inserted into the insertion holes 5a and 5a and the small loop portions 13 and 13 and fixed to the pair of mounting plates 4a and 4a. Thereby, the falling bridge prevention device 10 is bridged between the fixing pins 5 and 5 of the brackets 4 and 4. Note that the end reinforcing members 26 and 27 described above may be transported to the site in a state of being already attached to the small loop portions 13 and 13 or may be attached to the site. Further, a bush formed of an elastic body such as rubber, which serves as a buffer material, may be interposed between the end reinforcing members 26 and 26 and the fixing pins 5 and 5. Further, the fixing body to be the fixing pins 5 and 5 is not particularly limited as long as it is a column or prism inserted into the small loop portions 13 and 13, a plate or a cylindrical core or a pin, or the like.

［５．落橋防止装置の効果の説明］
以上のように構成された落橋防止装置１０は、全体が可撓性を有するループ状連結体１１で構成され、中間部用被覆体１２で被覆された状態であっても可撓性を有している。従って、落橋防止装置１０を橋桁１，２間に取り付ける場合（図１参照）や橋桁１又は２と橋台や橋脚３等との間に取り付ける場合にも、ループ状連結体１１が撓むことで、取付作業が容易となる。また、落橋防止装置１０は、ループ状連結体１１の中間部が中間部用被覆体１２で被覆されているだけなので、軽量化が図られ、この点でも作業効率の向上を図ることが出来る。 [5. Explanation of the effect of the falling bridge prevention device]
The fallen bridge prevention device 10 configured as described above is configured by a loop-shaped coupling body 11 having flexibility, and has flexibility even in a state of being covered by the intermediate covering body 12. ing. Therefore, when the falling bridge prevention device 10 is attached between the bridge girders 1 and 2 (see FIG. 1) or when it is attached between the bridge girder 1 or 2 and the abutment or the pier 3 or the like, the loop-like connecting body 11 is bent. The mounting work becomes easy. Moreover, since the fallen bridge prevention apparatus 10 is only covered with the intermediate | middle part coating | coated body 12 in the intermediate part of the loop-shaped connection body 11, weight reduction is achieved and it can aim at the improvement of work efficiency also in this point.

更に、落橋防止装置１０は、可撓性を有するループ状連結体１１の一部を強力な接着剤で重なり領域の各層を互いに強力に固化させることで一体固化させているので引張強度を極めて高くすることが出来、また、接合部１７はループ状連結体の一部だけとしているので全体として可撓性を有している。また、ループ状連結体は可撓性を有する中間部用被覆体１２によって被覆されているだけなので、被覆された状態であってもなお可撓性を有している。従って、ブラケット４，４間に取り付ける際には、弛ませた状態で取り付けることが出来、施工作業性等も良好で、橋桁等の温度伸縮にも十分追従することが出来る。また、ブラケット４，４の定着ピン５，５が挿通される小ループ部１３，１３は、端部用補強材２６，２６で保護されており、更に、定着ピン５，５の外形形状に対応して形成されているので、定着ピン５，５を介して印加される圧力が均一となり、また、定着ピン５，５との摩擦を低減することが出来る。更に、ループ状連結体１１は、その巻き数を二重、三重、四重・・・と増やすことで、容易に地震時許容荷重を高めていくことが出来、この際にも、軽量の帯状長尺体１１ａの巻き数が増えるだけなので、重くなることを防止することが出来る。その上、引張強度の増強に伴って増えるのは、厚み方向のみであり、幅方向が増えないので、コスト増要因の主因となるブラケットサイズの大型化をする必要が無く、製品コストの増大を防ぐことが出来る。   Further, the falling bridge prevention device 10 has a part of the flexible loop-shaped coupling body 11 solidified by strongly solidifying each other in the overlapping region with a strong adhesive, so that the tensile strength is extremely high. In addition, since the joint portion 17 is only a part of the loop-like connecting body, it has flexibility as a whole. Further, since the loop-shaped connecting body is only covered with the covering portion 12 having flexibility, it is still flexible even in the covered state. Therefore, when attaching between the brackets 4 and 4, it can be attached in a relaxed state, the workability and the like are good, and the temperature expansion and contraction of the bridge girder can be sufficiently followed. Further, the small loop portions 13 and 13 through which the fixing pins 5 and 5 of the brackets 4 and 4 are inserted are protected by end reinforcing members 26 and 26 and further correspond to the outer shape of the fixing pins 5 and 5. Therefore, the pressure applied via the fixing pins 5 and 5 becomes uniform, and the friction with the fixing pins 5 and 5 can be reduced. Furthermore, the loop-shaped connecting body 11 can easily increase the allowable load during an earthquake by increasing the number of windings to double, triple, quadruple, etc. In this case as well, a lightweight belt-like structure Since only the number of windings of the long body 11a increases, it can prevent becoming heavy. In addition, the increase in tensile strength is only in the thickness direction and not in the width direction, so there is no need to increase the bracket size, which is the main cause of the cost increase, and increase the product cost. Can be prevented.

［６．落橋防止装置の第一の変形例の説明］
落橋防止装置１０は、図１２〜図１６に示すように、ループ状連結体１１の一方の中間部１５ａと他方の中間部１５ｂとの間に、ループ状連結体１１の形状を保持する形状保持部材３０を設けるようにしても良い。 [6. Description of first modification of fallen bridge prevention device]
As shown in FIGS. 12 to 16, the falling bridge prevention device 10 holds the shape of the loop-shaped connecting body 11 between the one intermediate portion 15 a and the other intermediate portion 15 b of the loop-shaped connecting body 11. The member 30 may be provided.

この形状保持部材３０は、例えばポリウレタン等の合成樹脂を発泡成形して形成されたスポンジやポリスチレン等の合成樹脂を微細な泡で発泡させて硬化させた発泡スチロール等、ループ状連結体１１の可撓性を損なわないように可撓性を有する材料で形成されている。なお、形状保持部材３０は、可撓性を有することが好ましいが、可撓性を有していない又は低い金属板や合成樹脂等、非可撓性の材料で形成されるようにしても良い。可撓性を有する場合には、製造作業や施工作業等の作業性が良く、可撓性を有していない場合には、より強固にループ状連結体１１の形状を保持することが出来る。   The shape holding member 30 is a flexible member of the loop-like connecting body 11 such as foamed polystyrene made by foaming a synthetic resin such as sponge or polystyrene formed by foaming a synthetic resin such as polyurethane with fine bubbles. It is formed of a flexible material so as not to impair the performance. The shape holding member 30 is preferably flexible, but may be formed of an inflexible material such as a metal plate or a synthetic resin that is not flexible or low. . When it has flexibility, workability, such as manufacturing work and construction work, is good, and when it does not have flexibility, the shape of loop connection object 11 can be held more firmly.

また、形状保持部材３０は、図１２に示すように、例えばループ状連結体１１の中間部１５ａ，１５ｂと同程度の幅と長さを有する矩形板状に形成されるようにしても良い。形状保持部材３０は、図１３に示すように、中間部１５ａ，１５ｂの長さよりも短い所定の長さを有する矩形板状に形成されて、ループ状連結体１１の長さ方向に複数個配置されるようにしても良い。この際、形状保持部材３０は、隣接する互いの側面を当接するように配置しても良く、所定の距離離間させて配置するようにしても良い。このように形状保持部材３０をループ状連結体１１の長さ方向に複数個配置することで、形状保持部材３０自体は非可撓性の材料で形成されていても、全体として可撓性を有するようになり、ループ状連結体１１の形状を保持しつつ、製造作業や施工作業等の作業性を向上させることが出来る。   Further, as shown in FIG. 12, the shape holding member 30 may be formed in a rectangular plate shape having a width and length similar to those of the intermediate portions 15 a and 15 b of the loop coupling body 11, for example. As shown in FIG. 13, the shape holding member 30 is formed in a rectangular plate shape having a predetermined length shorter than the lengths of the intermediate portions 15 a and 15 b, and a plurality of shape holding members 30 are arranged in the length direction of the loop-shaped connecting body 11. You may be made to do. At this time, the shape holding member 30 may be disposed so that adjacent side surfaces abut against each other, or may be disposed at a predetermined distance apart. By arranging a plurality of shape holding members 30 in the length direction of the loop-shaped connecting body 11 in this way, even if the shape holding member 30 itself is formed of an inflexible material, flexibility as a whole is increased. Thus, it is possible to improve workability such as manufacturing work and construction work while maintaining the shape of the loop-shaped connecting body 11.

また、形状保持部材３０は、図１４、図１５及び図１６に示すように、厚肉に設けても良い。これにより、小ループ部１３は、図１２及び図１３に示すような中間部１５ａ，１５ｂ側が絞られてＣ字状に形成されるのではなく、中間部１５ａ，１５ｂ側が絞られていない半円状又はＵ字状に形成される。この際、形状保持部材３０は、図１４に示すように、中間部１５ａ，１５ｂと同程度の幅と長さを有するように形成されるようにしても良く、図１５に示すように、中間部１５ａ，１５ｂの長さよりも短い所定の長さを有するように形成されて、ループ状連結体１１の長さ方向に複数個配置されるようにしても良い。また、形状保持部材３０をループ状連結体１１の長さ方向に複数個配置する場合には、形状保持部材３０を、隣接する互いの側面を当接するように配置しても良く、所定の距離離間させて配置するようにしても良い。このように、形状保持部材３０を厚肉に設けて、小ループ部１３を半円状又はＵ字状に形成することで、小ループ部１３の中間部１５ａ，１５ｂ側が絞られることによってループ状連結体１１を構成する各層の帯状長尺体１１ａ間に内外径差（隙間）が出来て、ループ状連結体１１に弛みや緩みが発生することを防止することが出来る。   Moreover, you may provide the shape holding member 30 thickly, as shown in FIG.14, FIG15 and FIG.16. Thus, the small loop portion 13 is not formed in a C shape by narrowing the intermediate portions 15a and 15b as shown in FIGS. Or U-shaped. At this time, the shape retaining member 30 may be formed to have the same width and length as the intermediate portions 15a and 15b, as shown in FIG. 14, and as shown in FIG. It may be formed so as to have a predetermined length shorter than the lengths of the portions 15 a and 15 b, and a plurality of them may be arranged in the length direction of the loop-shaped connecting body 11. In addition, when a plurality of shape holding members 30 are arranged in the length direction of the loop-shaped connecting body 11, the shape holding members 30 may be arranged so that the side surfaces adjacent to each other are in contact with each other at a predetermined distance. You may make it arrange | position so that it may space apart. In this way, the shape holding member 30 is provided thick, and the small loop portion 13 is formed in a semicircular shape or a U-shape, whereby the intermediate portions 15a and 15b side of the small loop portion 13 are narrowed down to form a loop shape. It is possible to prevent the inner and outer diameter differences (gap) between the strip-like long bodies 11a of the respective layers constituting the connecting body 11 from occurring, and the loop-like connecting body 11 from being loosened or loosened.

また、形状保持部材３０は、図１４に示すように、ループ状連結体１１の長手方向の側面を平面状に設けるようにしても良く、図１５に示すように、ブラケット４の定着ピン５と対応するように凹円弧状に設けるようにしても良い。   Further, as shown in FIG. 14, the shape maintaining member 30 may be provided with a flat side surface in the longitudinal direction of the loop-shaped connecting body 11, and as shown in FIG. You may make it provide in a concave arc shape so that it may respond | correspond.

また、形状保持部材３０は、図１６に示すように、中間部１５ａ，１５ｂの長さよりも短い形状保持部材３０を、隣接する形状保持部材３０に対して互いの側面を当接するように、ループ状連結体１１の長さ方向に複数個配置する場合、ループ状連結体１１の長手方向の一方の側面に凸円弧状の凸円弧部３０ａを設け、他方の側面に一方の側面の凸円弧部３０ａに対応する凹円弧状の凹円弧部３０ｂを設けるようにしても良い。この際、一方の小ループ部１３の最も近くに位置する形状保持部材３０は、一方の側面及び他方の側面ともに、凹円弧部３０ｂを設けるようにしても良い。このように、ループ状連結体１１の長手方向の一方の側面に凸円弧部３０ａを設け、他方の側面に凹円弧部３０ｂを設けて、一の形状保持部材３０の凸円弧部３０ａが隣接する他の形状保持部材３０の凹円弧部３０ｂに嵌合するように、形状保持部材３０をループ状連結体１１の長さ方向に複数個配置することで、形状保持部材３０を隣接する互いの側面が当接するように配置しても、平面状の側面を当接する場合よりも、全体としてより可撓性を有するようになり、ループ状連結体１１の形状を保持しつつ、製造作業や施工作業等の作業性を向上させることが出来る。なお、一方の小ループ部１３の最も近くに位置する形状保持部材３０の一方の側面を平面状に設け、他方の小ループ部１３の最も近くに位置する形状保持部材３０の他方の側面を平面状に設けて、両端部を平面上に設けるようにしても良い。   In addition, as shown in FIG. 16, the shape holding member 30 is looped so that the shape holding member 30 shorter than the length of the intermediate portions 15 a and 15 b abuts the side surfaces of the shape holding members 30 on the adjacent shape holding members 30. When a plurality of the connecting bodies 11 are arranged in the length direction, a convex arc portion 30a having a convex arc shape is provided on one side surface in the longitudinal direction of the loop connecting body 11, and a convex arc portion on one side surface is provided on the other side surface. A concave arc portion 30b having a concave arc shape corresponding to 30a may be provided. At this time, the shape maintaining member 30 located closest to the one small loop portion 13 may be provided with the concave arc portion 30b on one side surface and the other side surface. As described above, the convex arc portion 30a is provided on one side surface in the longitudinal direction of the loop-shaped connecting body 11, the concave arc portion 30b is provided on the other side surface, and the convex arc portion 30a of one shape holding member 30 is adjacent. By arranging a plurality of shape holding members 30 in the length direction of the loop-shaped coupling body 11 so as to fit into the concave arc portions 30b of the other shape holding members 30, the shape holding members 30 are adjacent to each other. Even if it arrange | positions so that it may contact | abut, it will have more flexibility as a whole rather than the case where a planar side is contact | abutted, manufacturing work and construction work, maintaining the shape of the loop-shaped coupling body 11 Etc. can be improved. In addition, one side surface of the shape holding member 30 located closest to one small loop portion 13 is provided in a planar shape, and the other side surface of the shape holding member 30 located closest to the other small loop portion 13 is planar. It is also possible to provide both ends on a plane.

更に、形状保持部材３０は、内部に中空部を設けるようにしても良い。このように、内部に中空部を設けることで、形状保持部材３０は、ループ状連結体１１の形状を保持しつつ、軽量化を図ることが出来る。   Furthermore, the shape maintaining member 30 may be provided with a hollow portion inside. Thus, by providing the hollow portion inside, the shape maintaining member 30 can be reduced in weight while maintaining the shape of the loop-shaped connecting body 11.

なお、第一の変形例の落橋防止装置１０は、ループ状連結体１１の一方の中間部１５ａと他方の中間部１５ｂとの間に形状保持部材３０を設けた上で、中間部用被覆体１２や端部用被覆体１４や中間部用補強材１８や端部用補強材２６，２７等が設けられるが、これら中間部用被覆体１２や端部用被覆体１４や中間部用補強材１８や端部用補強材２６，２７等については、形状保持部材３０が設けられていない上述した落橋防止装置１０の場合と同様の構成を有するので、ここでは説明を省略する。   The falling bridge prevention device 10 according to the first modification is provided with a shape holding member 30 between one intermediate portion 15a and the other intermediate portion 15b of the loop-shaped connecting body 11, and then a covering portion for the intermediate portion. 12, end covering 14, intermediate reinforcing member 18, end reinforcing members 26, 27, etc. are provided. These intermediate covering 12, end covering 14, and intermediate reinforcing member are provided. 18 and the end reinforcing members 26 and 27 have the same configuration as that of the above-described falling bridge prevention device 10 in which the shape holding member 30 is not provided, and thus the description thereof is omitted here.

［７．落橋防止装置の第二の変形例の説明］
図１７に示すように、落橋防止装置１０のループ状連結体１１が、一本の平紐状の長尺な繊維束４０が幅方向に複数束並列されているとともに厚さ方向に複数段積層されるように、ループ状に複数回巻回されることで構成され、所謂、糸巻き型に構成されるようにしても良い。 [7. Description of second modification of fallen bridge prevention device]
As shown in FIG. 17, the loop-like connecting body 11 of the falling bridge prevention device 10 includes a single flat string-like long fiber bundle 40 arranged in parallel in the width direction and laminated in a plurality of stages in the thickness direction. In this way, it is configured by being wound a plurality of times in a loop shape, and may be configured as a so-called pincushion type.

ループ状連結体１１を構成する繊維束４０は、長さ方向の引張強度が高い高引張強度繊維を使用しており、ここでは、ベクトラン（登録商標）やポリエステルから成る繊維を用いている。更に、繊維束４０は、図１８に示すように、断面視矩形状の長尺な長尺部材であり、例えば、幅ｗが１０ｍｍ、厚さｔが０．５〜１．０ｍｍ程度に形成されている。なお、繊維束４０の幅ｗ及び厚さｔは、ループ状に巻回可能な程度の可撓性を有することが出来れば如何なる値でも良く、適宜変更可能である。   The fiber bundle 40 constituting the loop-shaped connecting body 11 uses high tensile strength fibers having a high tensile strength in the length direction, and here, fibers made of Vectran (registered trademark) or polyester are used. Furthermore, as shown in FIG. 18, the fiber bundle 40 is a long and long member having a rectangular shape in cross section. For example, the fiber bundle 40 is formed with a width w of 10 mm and a thickness t of about 0.5 to 1.0 mm. ing. The width w and the thickness t of the fiber bundle 40 may be any value as long as the fiber bundle 40 can be wound in a loop shape and can be changed as appropriate.

このような平紐状の長尺な繊維束４０は、図１７に示すように、複数回巻回されることで、ループ状連結体１１を構成している。この際、ループ状連結体１１は、図１９に示すように、断面視すると、繊維束４０が幅方向に複数束並列されているとともに厚さ方向に複数段積層されるように巻回されている。   As shown in FIG. 17, such a flat fiber-like long fiber bundle 40 is wound a plurality of times to constitute a loop-like connecting body 11. At this time, as shown in FIG. 19, the loop-like connecting body 11 is wound so that a plurality of fiber bundles 40 are juxtaposed in the width direction and stacked in a plurality of stages in the thickness direction when viewed in cross section. Yes.

具体的に、繊維束４０は、先ず、例えば側面視長円形状に１巻き目の巻回が行われる。次いで、繊維束４０は、この１巻き目の繊維束４０ａ１の幅方向の一端側の一側面部に沿って、２巻き目の巻回が行われる。次いで、２巻き目の繊維束４０ａ２の幅方向の一端側の一側面部に沿って、３巻き目の巻回が行われる。その後、同様にして、繊維束４０の幅方向の他端側から一端側に向けて、隣接する繊維束４０の幅方向の一端側の一側面部に沿って、４〜１０巻き目の巻回が行われる。こうして、繊維束４０は、繊維束４０の幅方向に１０束並列される。 Specifically, the fiber bundle 40 is first wound, for example, in an oval shape in a side view. Next, the second bundle of the fiber bundle 40 is wound along one side surface of one end side in the width direction of the first fiber bundle 40a1. Next, the third winding is performed along one side surface of one end side in the width direction of the second fiber bundle 40a2. Thereafter, similarly, from the other end side in the width direction of the fiber bundle 40 toward one end side, the fourth to tenth turns are wound along one side surface portion on one end side in the width direction of the adjacent fiber bundle 40. Is done. In this way, ten fiber bundles 40 are juxtaposed in the width direction of the fiber bundle 40.

次いで、１１巻き目の巻回が行われる際には、１０巻き目の繊維束４０ａ１０の上面部上に、１０巻き目の繊維束４０ａ１０の上面部に沿って、１１巻き目の巻回が行われる。次いで、繊維束４０は、９巻き目の繊維束４０ａ９の上面部上に、１１巻き目の繊維束４０ａ１１の幅方向の他端側の他側面部に沿って、１２巻き目の巻回が行われる。次いで、８巻き目の繊維束４０ａ８の上面部上に、１２巻き目の繊維束４０ａ１２の幅方向の他端側の他側面部に沿って、１３巻き目の巻回が行われる。その後、同様にして、７巻き目の繊維束４０ａ７から１巻き目の繊維束４０ａ１までの上面部上に、繊維束４０の幅方向の一端側から他端側に向けて、隣接する繊維束４０の幅方向の他端側の他側面部に沿って、１４〜２０巻き目の巻回が行われる。 Then, when the 11 th-turn of winding is performed, on the upper surface portion of the 10 th-turn of the fiber bundle 40a 10, along the upper surface of the fiber bundle 40a 10 10 th-turn, winding the 11 th-turn Is done. Next, the fiber bundle 40 is wound on the upper surface of the ninth fiber bundle 40a 9 along the other side surface on the other end side in the width direction of the eleventh fiber bundle 40a. Is done. Next, the 13th winding is performed on the upper surface of the 8th fiber bundle 40a8 along the other side surface on the other end side in the width direction of the 12th fiber bundle 40a12. Then, Similarly, on the upper surface of the 7 th-turn of the fiber bundle 40a 7 until the fiber bundle 40a 1 of 1 th-turn, toward the other end from one end side in the width direction of the fiber bundle 40, adjacent fibers The 14th to 20th windings are performed along the other side surface of the other end side in the width direction of the bundle 40.

つまり、ループ状連結体１１は、１段目に１０束の繊維束４０が繊維束４０の幅方向に他端側から一端側に向けて並列され、その１段目の繊維束４０上に、２段目として、１０束の繊維束４０が繊維束４０の幅方向に一端側から他端側に向けて並列される。   That is, in the loop-shaped connecting body 11, in the first stage, 10 bundles of fiber bundles 40 are arranged in parallel in the width direction of the fiber bundle 40 from the other end side to the one end side, and on the first stage fiber bundle 40, As the second stage, 10 bundles of fiber bundles 40 are juxtaposed in the width direction of the fiber bundle 40 from one end side to the other end side.

次いで、２１回の巻回が行われる際には、２０巻き目の繊維束４０ａ２０の上面部上に、２０巻き目の繊維束４０ａ２０の上面部に沿って、２１巻き目の巻回が行われる。次いで、繊維束４０は、１９巻き目の繊維束４０ａ１９の上面部上に、２１巻き目の繊維束４０ａ２１の幅方向の一端側の一側面部に沿って、２２巻き目の巻回が行われる。同様にして、繊維束４０は、１８巻き目の繊維束４０ａ１８から１１巻き目の繊維束４０ａ１１までの上面部上に、繊維束４０の幅方向の他端側から一端側に向けて、隣接する繊維束４０の幅方向の一端側の一側面部に沿って、２３〜３０巻き目の巻回が行われる。 Then, when the 21 times of winding is performed, on the 20 th-turn of the upper surface portion of the fiber bundle 40a 20, along the upper surface portion of the 20 th-turn of the fiber bundle 40a 20, 21 th-turn of winding Done. Next, the fiber bundle 40 is wound on the upper surface of the 19th fiber bundle 40a 19 along the side surface on one end side in the width direction of the 21st fiber bundle 40a21. Done. Similarly, the fiber bundle 40, on the upper surface of the 18 th-turn of the fiber bundle 40a 18 to 11 th-turn of the fiber bundle 40a 11, toward the one end side from the other end side in the width direction of the fiber bundle 40, Winding of the 23rd to 30th turns is performed along one side surface of one end side in the width direction of the adjacent fiber bundle 40.

更に、同様に、３１〜４０巻き目の巻回は、３０〜２１巻き目の繊維束までの上面部上に、繊維束４０の幅方向の一端側から他端側に向けて行われ、４１〜５０巻き目の巻回は、４０〜３１巻き目の繊維束までの上面部上に、繊維束４０の幅方向の他端側から一端側に向けて行われる。５１〜６０巻き目の巻回は、５０〜４１巻き目の繊維束までの上面部上に、繊維束４０の幅方向の一端側から他端側に向けて行われ、６１〜７０巻き目の巻回は、６０〜５１巻き目の繊維束までの上面部上に、繊維束４０の幅方向の他端側から一端側に向けて行われる。７１〜８０巻き目の巻回は、７０〜６１巻き目の繊維束までの上面部上に、繊維束４０の幅方向の一端側から他端側に向けて行われ、８１〜９０巻き目の巻回は、８０〜７１巻き目の繊維束までの上面部上に、繊維束４０の幅方向の他端側から一端側に向けて行われる。９１〜１００巻き目の巻回は、９０〜８１巻き目の繊維束までの上面部上に、繊維束４０の幅方向の一端側から他端側に向けて行われる。   Furthermore, similarly, the winding of the 31st to 40th turns is performed from one end side to the other end side in the width direction of the fiber bundle 40 on the upper surface portion up to the fiber bundle of the 30th to 21st turns. The 50th winding is performed from the other end side in the width direction of the fiber bundle 40 toward the one end side on the upper surface portion of the 40-31st fiber bundle. The windings of the 51st to 60th windings are performed from one end side to the other end side in the width direction of the fiber bundle 40 on the upper surface portion up to the 50th to 41st winding fiber bundles, and the 61st to 70th windings are performed. Winding is performed from the other end side in the width direction of the fiber bundle 40 toward the one end side on the upper surface portion of the 60-51st fiber bundle. The winding of the 71st to 80th turns is performed from the one end side in the width direction of the fiber bundle 40 toward the other end side on the upper surface portion up to the 70 to 61st fiber bundle, and the 81st to 90th turns. Winding is performed from the other end side in the width direction of the fiber bundle 40 toward the one end side on the upper surface portion of the 80-71st fiber bundle. The 91st to 100th windings are performed from one end side to the other end side in the width direction of the fiber bundle 40 on the upper surface portion of the 90 to 81st fiber bundle.

以上のようにして、ループ状連結体１１は、一本の平紐状の長尺な繊維束４０が合計１００回巻回されて、一本の平紐状の長尺な繊維束４０によって、繊維束４０の幅方向に１０束並列された繊維束４０が厚さ方向にジグザグ状に１０段積層されるように設けられている。なお、繊維束４０の幅方向に並列される繊維束４０の数や厚さ方向に積層される繊維束４０の数は、これに限定されるものではなく、例えば１０束並列×８段（巻回数８０）、１０束並列×７段（巻回数７０）、７束並列×７段（巻回数４９）、７束並列×５段（巻回数３５）等、許容荷重（引張強度）や寸法等に応じて、適宜変更可能である。   As described above, the loop-shaped connecting body 11 includes a single flat string-like long fiber bundle 40 wound around a total of 100 times, and the single flat string-like long fiber bundle 40 is used as a fiber bundle. Ten bundles of fiber bundles 40 arranged in parallel in the width direction of 40 are stacked in a zigzag manner in the thickness direction. The number of fiber bundles 40 arranged in the width direction of the fiber bundle 40 and the number of fiber bundles 40 laminated in the thickness direction are not limited to this, and for example, 10 bundles in parallel × 8 stages (winding) Number of times 80) 10 bundles parallel x 7 stages (number of turns 70), 7 bundles parallel x 7 stages (number of turns 49), 7 bundles parallel x 5 stages (number of turns 35), allowable load (tensile strength), dimensions, etc. It can be changed as appropriate.

更に、上述したように繊維束４０が巻回されて成るループ状連結体１１は、平紐状の繊維束４０の全体、或いは、一部の領域を、高引張強度繊維に加えてバインダ繊維を含ませ、高引張強度繊維とバインダ繊維とを共に結束することが出来る。例えば、バインダ繊維としては、ポリアミド系の低融点フィラメントを用いることが出来る。このポリアミド系の低融点フィラメントは、アラミド繊維等の高引張強度繊維の融点よりも十分に低い温度、例えば９０〜１４０℃程度で融解し、繊維束４０を構成する際、バインダ繊維を含有させた高引張強度繊維の集合体を、バインダ繊維の融点程度の温度で加熱することで、バインダ繊維のみが融解して高引張強度繊維間に浸透し、結果として繊維束４０はポリアミド系の合成樹脂で被覆される。従って、ループ状連結体１１としても、繊維束４０がループ状に成形された後に加熱（融解）すれば、バインダ繊維が融解して形成された皮膜によって、繊維束４０，４０同士を結合することも出来る。よって、ループ状連結体１１は、可撓性を維持しつつ、繊維束４０がばらけることを防止することが出来る。更に、ループ状連結体１１は、繊維束４０が平紐状に形成されているので、繊維束４０，４０同士を広面積で結合することが出来る。勿論、融着によらず、接着剤を含浸させることで繊維束４０，４０同士を結合しても良い。   Further, as described above, the loop-like connected body 11 in which the fiber bundle 40 is wound includes the binder fiber in addition to the high tensile strength fiber in the whole or a part of the flat string-like fiber bundle 40. However, the high tensile strength fiber and the binder fiber can be bound together. For example, a polyamide low melting point filament can be used as the binder fiber. This polyamide-based low melting point filament was melted at a temperature sufficiently lower than the melting point of high tensile strength fibers such as aramid fibers, for example, about 90 to 140 ° C., and included in the fiber bundle 40, binder fibers were included. By heating the aggregate of high tensile strength fibers at a temperature about the melting point of the binder fibers, only the binder fibers melt and penetrate between the high tensile strength fibers. As a result, the fiber bundle 40 is made of a polyamide-based synthetic resin. Covered. Accordingly, even when the fiber bundle 40 is heated (melted) after the fiber bundle 40 is formed into a loop shape, the fiber bundles 40 and 40 are bonded to each other by the film formed by melting the binder fiber. You can also. Therefore, the loop-shaped connecting body 11 can prevent the fiber bundle 40 from being scattered while maintaining flexibility. Furthermore, since the fiber bundle 40 is formed in a flat string shape in the loop-shaped connecting body 11, the fiber bundles 40 and 40 can be coupled with each other over a wide area. Of course, the fiber bundles 40 and 40 may be bonded to each other by impregnating with an adhesive without being fused.

なお、バインダ繊維は、ポリアミド系の合成樹脂繊維に限定されるものではなく、繊維束４０がループ状に成形された後に加熱（融解）されることで、繊維束４０，４０同士を結合することが出来るものであれば、適宜の合成樹脂を選択することが出来る。   The binder fibers are not limited to polyamide-based synthetic resin fibers, and the fiber bundles 40 and 40 are bonded to each other by heating (melting) after the fiber bundle 40 is formed into a loop shape. Any suitable synthetic resin can be selected.

更に、ループ状連結体１１は、バインダ繊維に代えて又は加えて、繊維束４０をループ状に成形する際に、繊維束４０，４０間の全面、或いは一面又は一部の領域に両面テープを設けて、この両面テープによって繊維束４０，４０同士を貼り付けて結合するようにしても良い。このような場合であっても、ループ状連結体１１は、両面テープによって繊維束４０，４０同士を結合することが出来、可撓性を維持しつつ、繊維束４０がばらけることを防止することが出来る。更に、ループ状連結体１１は、繊維束４０が平紐状に形成されているので、繊維束４０，４０同士を広面積で結合することが出来る。   Furthermore, the loop-shaped connecting body 11 is provided with a double-sided tape on the entire surface, one surface or a part of the region between the fiber bundles 40 and 40 when forming the fiber bundle 40 in a loop shape instead of or in addition to the binder fiber. It is also possible to provide the fiber bundles 40 and 40 together with this double-sided tape and bond them together. Even in such a case, the loop-shaped connecting body 11 can couple the fiber bundles 40 and 40 with the double-sided tape, and prevents the fiber bundle 40 from being scattered while maintaining flexibility. I can do it. Furthermore, since the fiber bundle 40 is formed in a flat string shape in the loop-shaped connecting body 11, the fiber bundles 40 and 40 can be coupled with each other over a wide area.

更に、ループ状連結体１１は、バインダ繊維や両面テープに代えて又は加えて、並列された繊維束４０がポリエステル繊維等の結合合成樹脂繊維によって束ねられることで、繊維束４０，４０同士を結合するようにしても良い。このような場合であっても、ループ状連結体１１は、結合合成樹脂繊維によって繊維束４０，４０同士を結合することが出来、可撓性を維持しつつ、繊維束４０がばらけることを防止することが出来る。勿論、繊維束４０を構成する場合にもバインダ繊維や両面テープによる結束に代えて又は加えて、縦糸の役割を果たす高引張強度繊維同士を、横糸の役割を果たす例えばポリエステル等から成る結束繊維を用いて編み込んで束ねて平紐状にしても良い。   Furthermore, the loop-like connecting body 11 joins the fiber bundles 40 and 40 by bundling the fiber bundles 40 arranged in parallel with a bonded synthetic resin fiber such as a polyester fiber instead of or in addition to the binder fiber or the double-sided tape. You may make it do. Even in such a case, the loop-like connecting body 11 can bind the fiber bundles 40 and 40 with the bonded synthetic resin fiber, and the fiber bundle 40 can be dispersed while maintaining flexibility. Can be prevented. Of course, in the case of constituting the fiber bundle 40, instead of or in addition to the binding by the binder fiber or the double-sided tape, the high tensile strength fibers that function as warp yarns and the binding fibers made of polyester or the like that function as weft yarns are used. They may be used and knitted together to form a flat string.

更に、ループ状連結体１１は、バインダ繊維や両面テープや結合合成樹脂繊維によって、一の繊維束４０が幅方向に隣接する他の繊維束４０及び厚さ方向に隣接する他の繊維束４０と全面に亘って結合されることが好ましいが、一の繊維束４０が幅方向に隣接する他の繊維束４０だけと全面又は部分的に結合されるようにしても良く、一の繊維束４０が厚さ方向に隣接する他の繊維束４０だけと全面又は部分的に結合されるようにしても良い。更に、ループ状連結体１１は、バインダ繊維や両面テープや結合合成樹脂繊維によって、繊維束４０の始端部及び終端部だけが幅方向及び／又は厚さ方向に隣接する繊維束４０と全面又は部分的に結合されるようにしても良い。更に、ループ状連結体１１は、バインダ繊維や両面テープや結合合成樹脂繊維によって、小ループ部１３を構成する領域だけが幅方向及び／又は厚さ方向に隣接する繊維束４０と全面又は部分的に結合されるようにしても良い。これらのような何れの場合であっても、ループ状連結体１１は、可撓性を維持しつつ、繊維束４０がばらけることを防止することが出来ることに加え、繊維束４０の全面がバインダ繊維で被覆されることに比べて、安価に製造することが出来る。   Furthermore, the loop-like connecting body 11 is made up of another fiber bundle 40 in which one fiber bundle 40 is adjacent in the width direction and another fiber bundle 40 adjacent in the thickness direction by binder fiber, double-sided tape, or bonded synthetic resin fiber. Although it is preferable to be bonded over the entire surface, one fiber bundle 40 may be bonded to the entire surface or only partly with another fiber bundle 40 adjacent in the width direction. You may make it couple | bond with the other fiber bundle 40 adjacent to the thickness direction entirely or partially. Furthermore, the loop-like connecting body 11 is made of a binder fiber, a double-sided tape, or a bonded synthetic resin fiber, and the whole or part of the fiber bundle 40 adjacent to the fiber bundle 40 in the width direction and / or the thickness direction. May be combined. Further, the loop-like connecting body 11 is formed of a binder fiber, a double-sided tape, or a bonded synthetic resin fiber so that only the region constituting the small loop portion 13 is entirely or partially connected to the fiber bundle 40 adjacent in the width direction and / or thickness direction. You may make it couple | bond with. In any case as described above, the loop-shaped connecting body 11 can prevent the fiber bundle 40 from being scattered while maintaining flexibility, and the entire surface of the fiber bundle 40 can be prevented. Compared to being coated with a binder fiber, it can be manufactured at a low cost.

なお、第二の変形例の落橋防止装置１０は、糸巻き型のループ状連結体１１を有する上で、中間部用被覆体１２や端部用被覆体１４や中間部用補強材１８や端部用補強材２６，２７等が取り付けられるが、これら中間部用被覆体１２や端部用被覆体１４や中間部用補強材１８や端部用補強材２６，２７等については、形状保持部材３０が設けられていない上述した落橋防止装置１０の場合と同様の構成を有するので、ここでは説明を省略する。   The falling bridge prevention device 10 according to the second modified example has a pincushion type loop-shaped connecting body 11, and further includes an intermediate covering member 12, an end covering member 14, an intermediate reinforcing member 18, and an end portion. The reinforcing members 26, 27, etc. are attached. However, the shape retaining member 30 is used for the intermediate covering member 12, the end covering member 14, the intermediate reinforcing member 18, the end reinforcing members 26, 27, and the like. Since it has the same configuration as that of the above-described fallen bridge prevention device 10 that is not provided, the description thereof is omitted here.

以上のように、第二の変形例の落橋防止装置１０は、帯状長尺体１１ａで構成されたループ状連結体１１を有する上述した落橋防止装置１０と略同様の効果に加え、一本の平紐状の長尺な繊維束４０が複数回巻回されて、繊維束４０が、繊維束４０の幅方向に複数束並列されているとともに繊維束４０の厚さ方向に複数段積層される構成を有している。従って、落橋防止装置１０は、一の繊維束４０が幅方向及び厚さ方向の他の繊維束４０と面と面とが当接する面接触するので、製作時に各繊維束４０の間に空隙が形成され難い。よって、落橋防止装置１０は、空隙が無い又は少ない分、製作時の形状変化が少なくなり、容易に繊維束４０を巻回することが出来、成形し易い。更に、落橋防止装置１０は、空隙が無い又は少ない分、引張力印加時に繊維束４０の幅方向に広がる等、製作時と引張力印加時との形状変化が少なくなり、製作時に製品幅をコントロールすることが容易であり、作業性が良い。更に、落橋防止装置１０は、空隙が無い又は少ない分、厚さ方向の繊維束４０の内外径差が少なく、引張力が作用された際に、引張力を均等に受けることが出来る。   As described above, the falling bridge prevention device 10 according to the second modified example has substantially the same effect as the above-described falling bridge prevention device 10 having the loop-like connecting body 11 formed of the strip-like long body 11a. A structure in which a flat fiber-like long fiber bundle 40 is wound a plurality of times, and a plurality of fiber bundles 40 are juxtaposed in the width direction of the fiber bundle 40 and stacked in a plurality of stages in the thickness direction of the fiber bundle 40 have. Accordingly, in the falling bridge prevention device 10, since one fiber bundle 40 is in surface contact with the other fiber bundle 40 in the width direction and the thickness direction and the surface comes into contact with the surface, there is a gap between the fiber bundles 40 at the time of manufacture. It is difficult to form. Therefore, the falling bridge prevention device 10 has fewer or less gaps, and the shape change at the time of manufacture is reduced, and the fiber bundle 40 can be easily wound and is easy to mold. Furthermore, the falling bridge prevention device 10 has less gaps, and the shape change between the time of manufacturing and the time of applying the tensile force is reduced, such as spreading in the width direction of the fiber bundle 40 when the tensile force is applied. Easy to work and good workability. Further, the falling bridge prevention device 10 has a small or small gap, so that the difference between the inner and outer diameters of the fiber bundle 40 in the thickness direction is small and can receive the tensile force evenly when the tensile force is applied.

更に、落橋防止装置１０は、ベクトラン繊維やポリエステル繊維を巻回して成るものであるから、全体としても可撓性を有すると共に、長さ方向の引張強度を極めて高くすることが出来る。従って、落橋防止装置１０は、橋桁１，２間に取り付ける場合（図１参照）や橋桁１又は２と橋台や橋脚３等との間に取り付ける場合に、撓ませて取り付けることが出来、取付作業を容易に行うことが出来る。更に、ブラケット４，４間に取り付ける際には、弛ませた状態で取り付けることが出来、施工作業性等も良好で、橋桁等の温度伸縮にも十分追従することが出来る。   Furthermore, since the falling bridge prevention device 10 is formed by winding Vectran fiber or polyester fiber, it has flexibility as a whole and can have extremely high tensile strength in the length direction. Accordingly, the falling bridge prevention device 10 can be bent and attached when it is attached between the bridge girders 1 and 2 (see FIG. 1) or between the bridge girder 1 or 2 and the abutment or pier 3 or the like. Can be easily performed. Furthermore, when attaching between the brackets 4 and 4, it can be attached in a relaxed state, the workability is good, and the temperature expansion and contraction of the bridge girder etc. can be sufficiently followed.

更に、落橋防止装置１０は、繊維束４０の巻回数を調整することで、容易に許容荷重（引張強度）を調整することが出来る。その上、繊維束４０を巻回する際に、幅方向の並列数や厚さ方向の段数（積層数）を変えることで、容易に製品寸法や許容荷重（引張強度）を変更することが出来る。   Furthermore, the falling bridge prevention device 10 can easily adjust the allowable load (tensile strength) by adjusting the number of windings of the fiber bundle 40. In addition, when the fiber bundle 40 is wound, the product dimensions and allowable load (tensile strength) can be easily changed by changing the number of rows in the width direction and the number of steps in the thickness direction (number of layers). .

更に、落橋防止装置１０は、バインダ繊維や両面テープや結合合成樹脂繊維によって、一の繊維束４０が他の繊維束４０と全面又は部分的に結合されている。従って、落橋防止装置１０は、可撓性を維持しつつ、繊維束４０がばらけることを防止することが出来、例えば搬送作業やブラケット４に取り付ける取付作業を容易に行うことが出来る。   Furthermore, in the falling bridge prevention device 10, one fiber bundle 40 is bonded to the other fiber bundle 40 entirely or partially by a binder fiber, a double-sided tape, or a bonded synthetic resin fiber. Therefore, the falling bridge prevention device 10 can prevent the fiber bundle 40 from being scattered while maintaining flexibility, and can easily perform, for example, a transporting operation or an attaching operation to be attached to the bracket 4.

なお、第二の変形例の落橋防止装置１０は、糸巻き型のループ状連結体１１を有し、中間部用被覆体１２や端部用被覆体１４や中間部用補強材１８や端部用補強材２６，２７等が取り付けられることに加え、ループ状連結体１１の一方の中間部１５ａと他方の中間部１５ｂとの間に、ループ状連結体１１の形状を保持する形状保持部材３０を設けるようにしても良い。   The falling bridge prevention device 10 of the second modified example has a pincushion type loop-like connecting body 11, and includes an intermediate covering member 12, an end covering member 14, an intermediate reinforcing member 18 and an end member. In addition to the attachment of the reinforcing members 26, 27, etc., a shape holding member 30 that holds the shape of the loop-shaped coupling body 11 is provided between the one intermediate part 15a and the other intermediate part 15b of the loop-shaped coupling body 11. You may make it provide.

１ 第一の橋桁、２ 第二の橋桁、３ 橋脚、４ ブラケット、４ａ 取付板、５ 定着ピン、５ａ 挿通孔、１０ 落橋防止装置、１１ ループ状連結体、１１ａ 帯状長尺体、１２ 中間部用被覆体、１２ａ 熱収縮前の中間部用被覆体、１３ 小ループ部、１４ 端部用被覆体、１４ａ 熱収縮前の端部用被覆体、１５ａ 中間部、１５ｂ 中間部、１６ａ 内側の端部、１６ｂ 外側の端部、１７ 接合部、１７ａ 接着剤、１８ 中間部用補強材、１９ 枠体、１９ａ 第一枠部材、１９ｂ 第二枠部材、１９ｃ 固定部材、１９ｄ 貫通孔、２０ 保護層、２１ａ 枠部材、２１ｂ 蓋体、２１ｃ 凹部、２１ｄ 固定部材、２１ｅ 鍔部、２２ａ 第一枠部材、２２ｂ 第二枠部材、２２ｃ 鍔部、２２ｄ 鍔部、２２ｅ 凹部、２２ｆ 凹部、２２ｇ 固定部材、２３ａ 成形凹部、２３ｂ 第一成形型、２３ｃ 成形凹部、２３ｄ 第二成形型、２６ 端部用補強材、２６ａ 内側の面、２６ｂ 凹部、２７ 端部用補強材、２７ａ 凹部、３０ 形状保持部材、３０ａ 凸円弧部、３０ｂ 凹円弧部、４０ 繊維束 DESCRIPTION OF SYMBOLS 1 1st bridge girder, 2nd 2nd bridge girder, 3 bridge pier, 4a bracket, 4a mounting plate, 5 fixing pin, 5a insertion hole, 10 falling bridge prevention device, 11 loop connection body, 11a strip long body, 12 middle part Covering body, 12a Covering part for intermediate part before heat shrinkage, 13 Small loop part, Covering part for 14 end part, 14a Covering part for end part before heat shrinking, 15a Middle part, 15b Middle part, 16a Inner end Part, 16b outer end part, 17 joint part, 17a adhesive, 18 intermediate part reinforcing material, 19 frame body, 19a first frame member, 19b second frame member, 19c fixing member, 19d through-hole, 20 protective layer 21a frame member, 21b lid, 21c recess, 21d fixing member, 21e collar, 22a first frame member, 22b second frame member, 22c collar, 22d collar, 22e recess, 22f recess, 22g Fixed member, 23a molding recess, 23b first molding die, 23c molding recess, 23d second molding die, 26 end reinforcement, 26a inner surface, 26b recess, 27 end reinforcement, 27a recess, 30 shape Holding member, 30a Convex arc part, 30b Concave arc part, 40 Fiber bundle

Claims (10)

橋桁が落下することを防止する落橋防止装置において、
可撓性を有するループ状の連結体と、
前記ループ状の連結体の中間部を被覆し結束する可撓性を有する中間部用被覆体と、
前記ループ状の連結体の前記中間部用被覆体の両側に形成された小ループ部を被覆する端部用被覆体とを備え、
前記ループ状の連結体の中間部には、前記連結体と別体であり、幅方向に撓み難く、厚さ方向若しくは面外方向に撓み易い中間部用補強材が配設されていることを特徴とする落橋防止装置。 In the falling bridge prevention device that prevents the bridge girder from falling,
A loop-like coupling body having flexibility;
A flexible intermediate covering for covering and binding the intermediate portion of the loop-shaped connector;
An end covering for covering small loop portions formed on both sides of the intermediate covering of the loop-shaped connecting body,
The intermediate portion of the loop-shaped connecting body is provided with a reinforcing member for an intermediate portion that is separate from the connecting body and is difficult to bend in the width direction and is easily bent in the thickness direction or the out-of-plane direction. A feature to prevent falling bridges. 橋桁が落下することを防止する落橋防止装置において、
可撓性を有するループ状の連結体と、
前記ループ状の連結体の中間部を被覆し結束する可撓性を有する中間部用被覆体と、
前記ループ状の連結体の前記中間部用被覆体の両側に形成された小ループ部を被覆する端部用被覆体と、
前記ループ状の連結体の一方の中間部と他方の中間部との間に設けられ、該ループ状の連結体の形状を保持する形状保持部材を備えることを特徴とする落橋防止装置。 In the falling bridge prevention device that prevents the bridge girder from falling,
A loop-like coupling body having flexibility;
A flexible intermediate covering for covering and binding the intermediate portion of the loop-shaped connector;
An end covering for covering small loop portions formed on both sides of the intermediate covering of the loop-shaped connecting body;
A falling bridge prevention device comprising a shape holding member that is provided between one intermediate portion and the other intermediate portion of the loop-shaped connecting body and holds the shape of the loop-shaped connecting body. 前記形状保持部材は、前記ループ状の連結体の一方の中間部と他方の中間部との間に複数個設けられていることを特徴とする請求項２に記載の落橋防止装置。   The fall bridge prevention device according to claim 2, wherein a plurality of the shape maintaining members are provided between one intermediate portion and the other intermediate portion of the loop-shaped coupling body. 前記形状保持部材は、前記小ループ部が半円状又はＵ字状に形成されるように、厚肉に設けられていることを特徴とする請求項２又は３に記載の落橋防止装置。   The falling bridge prevention device according to claim 2 or 3, wherein the shape maintaining member is provided thick so that the small loop portion is formed in a semicircular shape or a U shape. 前記形状保持部材は、前記ループ状の連結体の長手方向の一方の側面に凸円弧状の凸円弧部が設けられ、他方の側面に該一方の側面の凸円弧部に対応する凹円弧状の凹円弧部が設けられていることを特徴とする請求項４に記載の落橋防止装置。   The shape holding member is provided with a convex arc portion having a convex arc shape on one side surface in the longitudinal direction of the loop-shaped connecting body, and a concave arc shape corresponding to the convex arc portion on the one side surface on the other side surface. The falling bridge prevention device according to claim 4, wherein a concave arc portion is provided. 前記ループ状の連結体は、長尺体を一周以上巻回して構成され、前記端部用被覆体に前記長尺体を挿通し、前記長尺体の端部を該長尺体の一部に固定して成ることを特徴とする請求項１乃至５の何れかに記載の落橋防止装置。   The loop-shaped connecting body is formed by winding a long body one or more times, inserting the long body through the end covering, and connecting the end of the long body to a part of the long body. The fallen bridge prevention device according to any one of claims 1 to 5, wherein the bridge prevention device is fixed to the bridge. 前記中間部用被覆体及び／又は前記端部用被覆体は、熱収縮性チューブであることを特徴とする請求項１乃至６の何れかに記載の落橋防止装置。   The fallen bridge prevention device according to any one of claims 1 to 6, wherein the intermediate cover and / or the end cover is a heat-shrinkable tube. 前記中間部用被覆体は、前記連結体を紫外線から保護する紫外線保護機能を有することを特徴とする請求項１乃至７の何れかに記載の落橋防止装置。   The fall bridge prevention device according to any one of claims 1 to 7, wherein the intermediate body covering body has an ultraviolet protection function for protecting the coupling body from ultraviolet light. 前記ループ状の連結体の両側に形成された前記小ループ部には、前記小ループ部に挿設される定着体の外周形状に対応する形状の端部用補強材が配設されていることを特徴とする請求項１乃至８の何れかに記載の落橋防止装置。   The small loop portions formed on both sides of the loop-shaped connecting body are provided with end reinforcing members having a shape corresponding to the outer peripheral shape of the fixing body inserted into the small loop portion. The fallen bridge prevention device according to any one of claims 1 to 8. 前記小ループ部において前記長尺体同士が成す層間には、低摩擦性を有する低摩擦面状体が配設されることを特徴とする請求項６乃至９の何れかに記載の落橋防止装置。   10. The falling bridge prevention device according to claim 6, wherein a low-friction surface-like body having a low friction property is disposed between layers formed by the long bodies in the small loop portion. .
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