JPH1193117A - Preventing chain against falling of bridge - Google Patents
Preventing chain against falling of bridgeInfo
- Publication number
- JPH1193117A JPH1193117A JP9254397A JP25439797A JPH1193117A JP H1193117 A JPH1193117 A JP H1193117A JP 9254397 A JP9254397 A JP 9254397A JP 25439797 A JP25439797 A JP 25439797A JP H1193117 A JPH1193117 A JP H1193117A
- Authority
- JP
- Japan
- Prior art keywords
- bridge
- chain
- flat plates
- pair
- connection
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Bridges Or Land Bridges (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、橋脚あるいは橋台
と橋梁間を連結チェーン等により連結して構成した橋梁
等の落下を防止するための落橋防止チェーンに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fall prevention chain for preventing a bridge or the like formed by connecting a pier or an abutment and a bridge with a connection chain or the like to prevent the bridge from falling.
【０００２】[0002]
【従来の技術】橋脚あるいは橋台と橋梁間を連結チェー
ン等により連結して構成した橋梁等の落下を防止するた
めの落橋防止チェーンとして、従来は図３に示したよう
なものが採用されている。これを簡単に説明すると、図
３（Ａ）に示すように、地上に立設された橋脚２１の上
に、該橋脚２１を連結部として複数の橋梁２２がゴム等
の緩衝材２８を介在させて設置固定されている。橋脚２
１の側壁上部に固定された定着金具２６と橋梁２２の底
部に固定された定着金具２７との間には、多数の連結さ
れたチェーンリング２９等からなる連結チェーン２３が
掛け渡され、地震等による限界以上の揺れに起因して橋
梁２２が橋脚２１から離脱した場合でも、前記連結チェ
ーン２３の存在によって橋梁２２が橋脚２１から落下す
ることがないように設計されている。前記連結チェーン
２３は、一部がゴム等の弾性材２５内に埋設されて主と
して長さ方向の弛みを吸収したり、軽度の橋脚２１と橋
梁２２との間の相対位置変動に対応できるように構成さ
れた緩衝性を有し、かつ連結チェーン２３全体の取付け
長さを調整するための連結金具としてのＵ字形のシャッ
クル２４が介設されている。2. Description of the Related Art Conventionally, a bridge as shown in FIG. 3 is used as a fall prevention chain for preventing a bridge or the like constructed by connecting a pier or an abutment and a bridge with a connection chain or the like to prevent the bridge from falling. . Briefly describing this, as shown in FIG. 3A, a plurality of bridges 22 are provided on a pier 21 erected on the ground with the pier 21 as a connecting portion and a cushioning material 28 such as rubber interposed therebetween. It is installed and fixed. Pier 2
Between a fixing bracket 26 fixed to the upper part of the side wall 1 and a fixing bracket 27 fixed to the bottom of the bridge 22, a connecting chain 23 composed of a large number of connected chain rings 29 and the like is stretched, and an earthquake or the like occurs. The bridge 22 is designed not to drop from the pier 21 due to the presence of the connecting chain 23 even when the bridge 22 separates from the pier 21 due to the shaking exceeding the limit due to. The connecting chain 23 is partially buried in an elastic material 25 such as rubber so as to mainly absorb slack in the longitudinal direction or to cope with a slight relative position change between the pier 21 and the bridge 22. A U-shaped shackle 24 as a connection fitting for adjusting the mounting length of the entire connection chain 23 having the configured buffering property is interposed.
【０００３】[0003]
【発明が解決しようとする課題】ところが、このような
従来の連結チェーン２３等に取付け長さを調整するため
に採用されているシャックル２４では、図３（Ｂ）に拡
大して示すように、通常、該シャックル２４のボルト３
３、ナット３４を挿入するための孔が穿設される頭部が
比較的厚みがあってチェーンリング２９との連結にあた
って邪魔になり、取付施工に大きな障害となることが多
く、そのためチェーンリング２９側を予めサイズを大き
くする必要があって、連結チェーン２３自体の重量増を
招く他、シャックル２４の材質変更に伴って強度計算を
する場合、図３（Ｃ）に示すように、地震等による外力
により橋桁と橋脚が遊離する方向の変位が作用すると、
その地震力の大きさに応じて連結装置には張力ｆが作用
するが、シャックル２４は特異な形状をしていることに
よって、その強度計算がきわめて困難である。有限要素
法等により応力解析を実施することも考えられるが、要
素の分割等、議論の余地もあって一般化は難しく実証試
験に頼らざるを得ないのが現状であった。しかも、強度
が大で曲げ加工し易い材料に限定されるため、その材料
の入手が困難で製作期間も長期間に渡ることも多かっ
た。However, in such a shackle 24 which is employed for adjusting the length of attachment to such a conventional connecting chain 23 as shown in FIG. Usually, the bolt 3 of the shackle 24
3. The head, in which a hole for inserting the nut 34 is drilled, is relatively thick and hinders the connection with the chain ring 29, and often hinders the mounting work. It is necessary to increase the size of the shackle 24 in advance, which leads to an increase in the weight of the connecting chain 23 itself. In addition, when calculating the strength in accordance with a change in the material of the shackle 24, as shown in FIG. When a displacement in the direction in which the bridge girder and the pier separate due to external force acts,
The tension f acts on the coupling device according to the magnitude of the seismic force, but the shackle 24 has a peculiar shape, so that its strength calculation is extremely difficult. Although it is conceivable to carry out stress analysis by the finite element method or the like, there is room for discussion such as division of elements, and generalization is difficult, and at present it has been necessary to rely on demonstration tests. In addition, since the material is limited to a material having high strength and easy to bend, it is difficult to obtain the material, and the manufacturing period is often long.
【０００４】そこで本発明では、以上述べてきたような
従来の落橋防止チェーンにおける諸課題を解決して、連
結作業が容易で、強度設計も容易な構造、形状を有し、
入手し易い部材によって加工も容易な連結金具を備えた
落橋防止チェーンを提供することを目的とする。In view of the above, the present invention solves the above-mentioned problems in the conventional fall prevention chain, and has a structure and a shape in which connection work is easy and strength design is easy.
It is an object of the present invention to provide a fall prevention chain provided with a connection fitting that is easy to work with easily available members.
【０００５】[0005]
【課題を解決するための手段】このため本発明では、橋
脚あるいは橋台と橋梁間を、一部がゴム等の弾性材内に
埋設されて緩衝性を有しかつ取付け長さを調整するため
の連結金具が介設された連結チェーン等により連結した
落橋防止チェーンにおいて、前記連結金具が一対の互い
に平行な平板の両端近傍にこれら平板に直交して貫通さ
れた一対の連結ボルトにより構成されたことを特徴とす
るものである。また本発明は、前記一対の平板の両端部
が前記連結ボルトとほぼ同心円の半円状部に形成された
ことを特徴とするものである。また本発明は、前記一対
の平板の中間位置にこれら平板に直交して配置されたス
ペーサを設置したことを特徴とするもので、これらを課
題解決のための手段とするものである。SUMMARY OF THE INVENTION Therefore, in the present invention, a part between a pier or an abutment and a bridge is buried in an elastic material such as rubber to have a cushioning property and to adjust a mounting length. In a fall prevention chain connected by a connecting chain or the like in which a connecting metal is interposed, the connecting metal is formed by a pair of connecting bolts penetrating in the vicinity of both ends of a pair of parallel flat plates at right angles to the flat plates. It is characterized by the following. Further, the present invention is characterized in that both ends of the pair of flat plates are formed in semicircular portions substantially concentric with the connection bolt. Further, the present invention is characterized in that spacers arranged orthogonally to the flat plates are provided at an intermediate position between the pair of flat plates, and these are used as means for solving the problems.
【０００６】[0006]
【実施の形態】以下本発明の実施の形態を図面に基づい
て説明する。図１および図２は、本発明の落橋防止チェ
ーンの１実施の形態を示すもので、図１（Ａ）は本発明
の落橋防止チェーンが使用された橋脚と橋梁との連結部
を示す側面図、図１（Ｂ）は連結チェーンの拡大図、図
１（Ｃ）は連結金具の分解図、図２は連結金具の強度計
算概要を示す説明図である。図１（Ａ）に示すように、
地上に立設された橋脚１の上に、該橋脚１を連結部とし
て複数の橋梁２がゴム等の緩衝材８を介在させて設置固
定されている。橋脚１の側壁上部に固定された定着金具
６と橋梁２の底部に固定された定着金具７との間には、
多数の連結されたチェーンリング９等からなる連結チェ
ーン３が掛け渡され、地震等による限界以上の揺れに起
因して橋梁２が橋脚１から離脱した場合でも、前記連結
チェーン３の存在によって橋梁２が橋脚１から落下する
ことがないように設計されている。前記連結チェーン３
は、一部がゴム等の弾性材５内に埋設されて主として長
さ方向の弛みを吸収したり、軽度の橋脚１と橋梁２との
間の相対位置変動に対応できるように構成された緩衝性
を有し、かつ連結チェーン３全体の取付け長さを調整す
るための連結金具４が介設されている。Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show an embodiment of a fall prevention chain according to the present invention. FIG. 1A is a side view showing a connecting portion between a pier and a bridge using the fall prevention chain of the present invention. 1 (B) is an enlarged view of the connecting chain, FIG. 1 (C) is an exploded view of the connecting fitting, and FIG. 2 is an explanatory view showing an outline of the strength calculation of the connecting fitting. As shown in FIG.
A plurality of bridges 2 are fixedly mounted on a pier 1 erected on the ground with the pier 1 as a connecting portion with a cushioning material 8 such as rubber interposed. Between the fixing bracket 6 fixed to the upper side wall of the pier 1 and the fixing bracket 7 fixed to the bottom of the bridge 2,
Even if the bridge 2 is detached from the pier 1 due to the shaking exceeding the limit due to an earthquake or the like, the connecting chain 3 including a large number of connected chain rings 9 and so on is bridged by the presence of the connecting chain 3. Is designed not to fall from the pier 1. The connecting chain 3
Is a buffer which is partially buried in an elastic material 5 such as rubber so as to mainly absorb slack in the longitudinal direction and to cope with a slight change in relative position between the pier 1 and the bridge 2. A connecting fitting 4 for adjusting the mounting length of the entire connecting chain 3 is provided.
【０００７】図１（Ｂ）および（Ｃ）に拡大して示すよ
うに、前記連結金具４は、一対の互いに平行な平板１０
および１１を主体として、これらの両端近傍に穿設され
た孔１２、１２に挿通され、これら平板１０および１１
に直交して貫通された一対の連結ボルト１３Ａ、１３Ｂ
とにより構成される。これらの連結ボルト１３Ａ、１３
Ｂの他端にはそれぞれナット１４Ａ、１４Ｂが螺合され
る。前記一対の平板１０および１１の両端部は、前記連
結ボルト１３Ａ、１４Ｂと、すなわち前記孔１２とほぼ
同心円の半円状部Ｒ、Ｒに形成され、さらに、前記一対
の平板１０および１１の中間位置にこれら平板１０およ
び１１に直交して配置されたスペーサ１５が設置され、
連結ボルト１３とナット１４とを緊締し過ぎることがな
いように構成されている。なお、該スペーサ１５は図示
の例のように幅方向を横断するように設置されてもよい
が、円柱状をなして平板１０と１１とを連結するように
設置されてもよいし、さらに、スペーサ１５がいずれか
の平板と一体に形成されていてもよいし、予め両方の平
板１０と１１とを連結する形態にて三者一体に形成して
もよいものである。As shown in FIGS. 1 (B) and 1 (C) in an enlarged manner, the connecting fitting 4 is provided with a pair of flat plates 10 parallel to each other.
And 11 as main components, are inserted through holes 12, 12 formed in the vicinity of both ends of these flat plates 10 and 11,
A pair of connecting bolts 13A, 13B penetrated at right angles to
It is composed of These connection bolts 13A, 13
Nuts 14A and 14B are screwed to the other end of B, respectively. Both ends of the pair of flat plates 10 and 11 are formed in the connecting bolts 13A and 14B, that is, semicircular portions R and R that are substantially concentric with the hole 12, and are further provided between the pair of flat plates 10 and 11 in the middle. Spacers 15 arranged at right angles to the flat plates 10 and 11 are installed at the positions,
The connection bolt 13 and the nut 14 are configured so as not to be excessively tightened. The spacer 15 may be installed so as to cross the width direction as in the illustrated example, or may be installed so as to form a columnar shape and connect the flat plates 10 and 11, The spacer 15 may be formed integrally with one of the flat plates, or may be formed integrally with the three flat plates 10 and 11 in advance.
【０００８】以上のように構成されているので、一対の
互いに平行な平板１０および１１の間の両側からそれぞ
れ適宜に長さが設定されて複数個連結されたチェーンリ
ング９、９を挿入して、連結ボルト・ナット１３Ａ、１
４Ａおよび１３Ｂ、１４Ｂによって連結して所定長さの
連結チェーン３を得ることができる。このようにして構
成された連結金具４における前記一対の平板１０および
１１の両端部は、図２に示すように、前記連結ボルト１
３Ａ、１４Ｂと、すなわち前記孔１２とほぼ同心円の半
円状部Ｒ、Ｒに形成されており、地震等による外力によ
り橋桁と橋脚が遊離する方向の変位が作用して、その地
震力の大きさに応じて連結装置に張力ｆが作用した場
合、各断面において引張り、剪断応力度に応じた係数を
外力ｆに掛け、各部の断面積で除すればよいので、その
強度計算が格段に簡素化される。また、連結金具４を構
成する主体である平板１０および１１が平板であるため
に、その材料に関する条件が少なく入手が容易である
他、その加工は、特殊な曲げ加工等を要することなく、
単純な機械加工のみにて安価に製作できる。With the above-described structure, a plurality of chain rings 9, 9 each having an appropriately set length and connected to each other, are inserted from both sides between a pair of mutually parallel flat plates 10 and 11. , Connecting bolt and nut 13A, 1
4A and 13B, 14B can be connected to obtain a connection chain 3 of a predetermined length. As shown in FIG. 2, the two ends of the pair of flat plates 10 and 11 in the connecting fitting 4 thus configured are connected to the connecting bolt 1.
3A, 14B, that is, semi-circular portions R, R that are substantially concentric with the hole 12, and a displacement in a direction in which the bridge girder and the pier are separated due to an external force due to an earthquake or the like acts, and the magnitude of the seismic force is increased. When the tension f is applied to the coupling device in accordance with the strength, the external force f is multiplied by a coefficient corresponding to the degree of shearing and the shear stress at each cross section, and divided by the cross-sectional area of each section. Be transformed into In addition, since the flat plates 10 and 11, which are the main constituents of the connection fitting 4, are flat plates, the conditions regarding the material are small and easy to obtain. In addition, the processing does not require a special bending process or the like.
It can be manufactured at low cost only by simple machining.
【０００９】以上、本発明の１実施の形態について詳述
したが、本発明の趣旨の範囲内で、橋脚および橋梁の形
状、およびそれらの間の連結形態等の関連構成、それら
の間に掛け渡される連結チェーンの位置、弾性材の材質
およびそれに埋設されるチェーンとの関連構成、連結チ
ェーンを構成する連結体としての部材の形状（連結体を
構成するならばチェーンによる連結でなくてもよ
い。）、連結金具としての平板およびボルトの形状、材
質、およびそれらの連結形態、スペーサの形状、その平
板との関連構成等については適宜採用できることは言う
までもない。Although the preferred embodiment of the present invention has been described in detail, within the scope of the present invention, the shapes of the piers and bridges, the related configurations such as the connection between them, and the hooks between them are described. The position of the connecting chain to be transferred, the material of the elastic material and the configuration related to the chain embedded therein, and the shape of the member as the connecting member forming the connecting chain (the connecting member need not be connected by a chain. ), It is needless to say that the shapes and materials of the flat plate and the bolt as the connection fitting, the connection form thereof, the shape of the spacer, the configuration related to the flat plate, and the like can be appropriately adopted.
【００１０】[0010]
【発明の効果】以上、詳細に述べてきたように、本発明
では、連結チェーンの取付け長さを調整するための連結
金具として、一対の互いに平行な平板の両端近傍にこれ
ら平板に直交して貫通された一対の連結ボルトにより構
成されているので、連結作業が容易で、入手し易い部材
によって加工も容易となる。そして、一対の平板の両端
部は、前記連結ボルトとほぼ同心円の半円状部に形成さ
れていることによって、地震等による外力により橋桁と
橋脚が遊離する方向の変位が作用して、その地震力の大
きさに応じて連結装置に張力が作用した場合の強度計算
が格段に簡素化され、その強度設計が容易である。ま
た、連結金具を構成する主体である平板が平板であるこ
とによって、その材料に関する条件が少なく入手が容易
である他、その加工は、特殊な曲げ加工等を要すること
なく、単純な機械加工のみにて安価に製作できる。しか
も、連結金具における前記一対の平板の中間位置にこれ
ら平板に直交してスペーサが配置されているので、連結
ボルトとナット１４とを緊締し過ぎることがないばかり
か、前記一対の平板が別部材によって構成された場合で
も、該スペーサによって一対の平板が適正に位置決めさ
れることにもなる。このように、本発明によれば、連結
作業が容易で、強度設計も容易な構造、形状を有し、入
手し易い部材によって加工も容易な連結金具を備えた落
橋防止チェーンが提供される。As described above in detail, according to the present invention, as a connecting bracket for adjusting the length of the connecting chain, a pair of mutually parallel flat plates is provided near the both ends of the pair of flat plates at right angles. Since it is constituted by a pair of penetrating connection bolts, the connection operation is easy, and the processing is easy with easily available members. Since both ends of the pair of flat plates are formed in semi-circular portions substantially concentric with the connection bolt, displacement in a direction in which the bridge girder and the pier are separated due to an external force due to an earthquake or the like acts, and the earthquake occurs. Calculation of the strength when a tension acts on the coupling device according to the magnitude of the force is greatly simplified, and the strength design is easy. In addition, since the flat plate, which is the main component of the connection fitting, is a flat plate, the conditions regarding the material are small and it is easy to obtain. In addition, the processing is only simple mechanical processing without special bending work. Can be manufactured at low cost. In addition, since the spacers are arranged orthogonally to the pair of flat plates at the intermediate position of the pair of flat plates in the connection fitting, not only are the connection bolts and the nut 14 not excessively tightened, but also the pair of flat plates are separate members. In this case, a pair of flat plates can be properly positioned by the spacer. As described above, according to the present invention, there is provided a fall prevention chain including a connection fitting that has a structure and a shape that can be easily connected, has an easy strength design, and is easily processed by an easily available member.
【図１】本発明の落橋防止チェーンの１実施の形態を示
すもので、図１（Ａ）は本発明の落橋防止チェーンが使
用された橋脚と橋梁との連結部を示す側面図、図１
（Ｂ）は連結チェーンの拡大図、図１（Ｃ）は連結金具
の分解図である。FIG. 1 shows one embodiment of a fall prevention chain according to the present invention, and FIG. 1 (A) is a side view showing a connecting portion between a pier and a bridge using the fall prevention chain according to the present invention;
(B) is an enlarged view of the connection chain, and FIG. 1 (C) is an exploded view of the connection fitting.
【図２】本発明の落橋防止チェーンの１実施の形態を示
すもので、連結金具の強度計算概要を示す説明図であ
る。FIG. 2 is an explanatory view showing an embodiment of a fall prevention chain according to the present invention, and showing an outline of calculation of strength of a connecting bracket.
【図３】従来の落橋防止チェーンが使用された橋脚と橋
梁との連結部を示す側面図、および連結金具としてのシ
ャックルの強度計算概要を示す説明図である。FIG. 3 is a side view showing a connecting portion between a pier and a bridge in which a conventional fall prevention chain is used, and an explanatory diagram showing an outline of calculation of strength of a shackle as a connecting fitting.
１ 橋脚 ２ 橋梁 ３ 連結チェーン ４ 連結金具 ５ 弾性材 ６ 定着金具 ７ 定着金具 ８ 緩衝材 ９ チェーンリング １０ 平板 １１ 平板 １２ 孔 １３ 連結ボルト １４ 連結ナット １５ スペーサ Ｒ 半円状部 REFERENCE SIGNS LIST 1 bridge pier 2 bridge 3 connecting chain 4 connecting fitting 5 elastic material 6 fixing fitting 7 fixing fitting 8 cushioning material 9 chainring 10 flat plate 11 flat plate 12 hole 13 connecting bolt 14 connecting nut 15 spacer R semicircular portion
Claims (3)
ム等の弾性材内に埋設されて緩衝性を有しかつ取付け長
さを調整するための連結金具が介設された連結チェーン
等により連結した落橋防止チェーンにおいて、前記連結
金具が一対の互いに平行な平板の両端近傍にこれら平板
に直交して貫通された一対の連結ボルトにより構成され
たことを特徴とする落橋防止チェーン。1. A connecting chain between a pier or an abutment and a bridge, a part of which is buried in an elastic material such as rubber and has a shock absorbing property and a connecting metal fitting for adjusting a mounting length. A chain for preventing a bridge from falling, characterized in that the connecting metal fittings are constituted by a pair of connecting bolts penetrating orthogonally to the pair of mutually parallel flat plates near both ends thereof.
トとほぼ同心円の半円状部に形成されたことを特徴とす
る請求項１に記載の落橋防止チェーン。2. The fall prevention chain according to claim 1, wherein both ends of the pair of flat plates are formed in semicircular portions substantially concentric with the connection bolt.
に直交して配置されたスペーサを設置したことを特徴と
する請求項１または２に記載の落橋防止チェーン。3. The fall prevention chain according to claim 1, wherein a spacer is provided at an intermediate position between the pair of flat plates and the spacer is disposed orthogonal to the flat plates.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9254397A JPH1193117A (en) | 1997-09-19 | 1997-09-19 | Preventing chain against falling of bridge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9254397A JPH1193117A (en) | 1997-09-19 | 1997-09-19 | Preventing chain against falling of bridge |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH1193117A true JPH1193117A (en) | 1999-04-06 |
Family
ID=17264417
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9254397A Pending JPH1193117A (en) | 1997-09-19 | 1997-09-19 | Preventing chain against falling of bridge |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH1193117A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101812827A (en) * | 2010-04-26 | 2010-08-25 | 中国建筑科学研究院 | Chain type tensile support |
| JP2015175211A (en) * | 2014-03-18 | 2015-10-05 | ショーボンド建設株式会社 | bridge girder fall prevention device |
| CN107503283A (en) * | 2017-08-09 | 2017-12-22 | 南昌大学 | Buffering energy-consumption type chain bridge anti-fall girder apparatus and its construction method |
| CN107761569A (en) * | 2017-09-28 | 2018-03-06 | 谢晓燕 | A kind of new bridge construction anti-drop device |
| JP2020045710A (en) * | 2018-09-20 | 2020-03-26 | 株式会社川金コアテック | Bridge fall prevention device |
| CN111576191A (en) * | 2020-05-28 | 2020-08-25 | 湖南万润建设科技有限公司 | Beam falling prevention device |
-
1997
- 1997-09-19 JP JP9254397A patent/JPH1193117A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101812827A (en) * | 2010-04-26 | 2010-08-25 | 中国建筑科学研究院 | Chain type tensile support |
| JP2015175211A (en) * | 2014-03-18 | 2015-10-05 | ショーボンド建設株式会社 | bridge girder fall prevention device |
| CN107503283A (en) * | 2017-08-09 | 2017-12-22 | 南昌大学 | Buffering energy-consumption type chain bridge anti-fall girder apparatus and its construction method |
| CN107761569A (en) * | 2017-09-28 | 2018-03-06 | 谢晓燕 | A kind of new bridge construction anti-drop device |
| CN107761569B (en) * | 2017-09-28 | 2019-05-14 | 甘肃路桥建设集团有限公司 | A kind of novel bridge construction anti-drop device |
| JP2020045710A (en) * | 2018-09-20 | 2020-03-26 | 株式会社川金コアテック | Bridge fall prevention device |
| CN111576191A (en) * | 2020-05-28 | 2020-08-25 | 湖南万润建设科技有限公司 | Beam falling prevention device |
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