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JP6798082B2 - How to replace the main cable of the suspension bridge - Google Patents
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JP6798082B2 - How to replace the main cable of the suspension bridge - Google Patents

How to replace the main cable of the suspension bridge Download PDF

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JP6798082B2
JP6798082B2 JP2016134700A JP2016134700A JP6798082B2 JP 6798082 B2 JP6798082 B2 JP 6798082B2 JP 2016134700 A JP2016134700 A JP 2016134700A JP 2016134700 A JP2016134700 A JP 2016134700A JP 6798082 B2 JP6798082 B2 JP 6798082B2
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cable
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stiffening girder
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良一 泊
良一 泊
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株式会社三井E&S鉄構エンジニアリング
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この発明は、山間部の渓谷や河口湾の断崖の間等に掛け渡されている吊り橋の主ケーブルを交換する吊り橋の主ケーブルの取替方法に関する。 The present invention relates to a method for replacing a main cable of a suspension bridge, which replaces the main cable of a suspension bridge that is laid between a valley in a mountainous area or a cliff in an estuary bay.

渓谷の両岸や河口湾を挟んだ断崖の間を通行するために掛け渡される橋梁では、橋脚を設置できずに長支間となることから、吊り橋が架設されている。吊り橋には列車や自動車の通行を目的とする大型のものから人の往来を目的とする小型のものまで種々のものが設置されている。特に、山間部等で人の往来を目的とする歩道橋の場合には、大きな幅員の交通路を要しないため、吊り橋が多用される。 Suspension bridges are erected on the bridges that are laid to pass between the cliffs that sandwich the river mouth bay and both banks of the valley, because the piers cannot be installed and the spans are long spans. Various types of suspension bridges are installed, from large ones for the purpose of passing trains and automobiles to small ones for the purpose of traffic. In particular, in the case of a pedestrian bridge for the purpose of traffic in mountainous areas, suspension bridges are often used because a wide traffic route is not required.

吊り橋は、主として、渓谷の両岸等に設置された主塔の塔頂を経由させた主ケーブルと、この主ケーブルに垂下させたハンガーロープの下端に支持させた補剛桁からなり、前記主ケーブルの端部をアンカーブロック等に固定する。補剛桁の両端部を両岸等に設置した橋脚に支持させる。この補剛桁に床版が設置されて歩行路が設けられる。 The suspension bridge mainly consists of a main cable that passes through the top of the main tower installed on both banks of the valley, and a stiffening girder that is supported by the lower end of the hanger rope that hangs from this main cable. Fix the end of the cable to an anchor block or the like. Both ends of the stiffening girder are supported by piers installed on both banks. A floor slab is installed on this stiffening girder to provide a walking path.

例えば、特許文献1には、主ケーブルを利用する摺動ビームを用いた吊橋補剛桁の引出し架設工法に用いる架設装置が開示されている。また、特許文献2には、ホーリングロープ長並びに駆動装置台数を最小限に抑え、且つ作業効率を向上し、工期の短縮と工事費の低減を図り得る吊橋用主ケーブルの架設方法及び装置が開示されている。 For example, Patent Document 1 discloses an erection device used in a pull-out erection method for a suspension bridge stiffening girder using a sliding beam using a main cable. Further, Patent Document 2 discloses a method and device for erection of a main cable for a suspension bridge, which can minimize the length of a halling rope and the number of drive devices, improve work efficiency, shorten the construction period, and reduce the construction cost. Has been done.

特公平2−22805号公報Special Fair 2-22805 Gazette 特開平10−237819号公報Japanese Unexamined Patent Publication No. 10-237819

吊り橋の前記主ケーブルは載荷重を前記アンカーブロックに伝達させるよう作用するが、この主ケーブルが老朽化して十分な強度を維持できなくなった場合には、力の伝達を果たせず、繰り返し荷重を受けること等により破損してしまうおそれが生じるから、該主ケーブルを取り替える必要が生じる。 The main cable of the suspension bridge acts to transmit the load to the anchor block, but if the main cable becomes old and cannot maintain sufficient strength, the force cannot be transmitted and the load is repeatedly received. Since there is a risk of damage due to such a thing, it becomes necessary to replace the main cable.

主ケーブルを取り替える場合には、既設の主ケーブルを外すことになるが、前記補剛桁を支持させる必要がある。吊り橋の構造では主ケーブルに垂下させた前記ハンガーロープの下端に補剛桁を支持させてあるから、既設の主ケーブルの撤去に先立ってこのハンガーロープを保持させる必要があり、主ケーブルに沿って仮ケーブルを架設し、この仮ケーブルにハンガーロープを保持させる。また、この仮ケーブルを支持するための仮鉄塔を前記主塔の外側に設置する。仮ケーブルにハンガーロープを保持させて補剛桁を支持させた状態で、既設の主ケーブルを撤去する。撤去した主ケーブルに替えて新たに主ケーブルを架設し、これに新たなハンガーロープを垂下させて補剛桁を保持させる。その後、仮ケーブルと仮鉄塔とを撤去する。上述の仮ケーブルの架設施工と新たな主ケーブルの架設施工には、例えば特許文献2に開示された架設方法によることができる。 When replacing the main cable, the existing main cable is removed, but it is necessary to support the stiffening girder. In the structure of the suspension bridge, since the stiffening girder is supported at the lower end of the hanger rope suspended from the main cable, it is necessary to hold the hanger rope prior to the removal of the existing main cable, and along the main cable. A temporary cable is erected, and the temporary cable holds the hanger rope. Further, a temporary steel tower for supporting the temporary cable is installed outside the main tower. With the temporary cable holding the hanger rope and supporting the stiffening girder, remove the existing main cable. A new main cable is erected in place of the removed main cable, and a new hanger rope is hung on this to hold the stiffening girder. After that, the temporary cable and the temporary tower are removed. For the above-mentioned erection of the temporary cable and the erection of the new main cable, for example, the erection method disclosed in Patent Document 2 can be used.

しかしながら、仮ケーブルと新たな主ケーブルとのそれぞれについて架設施工を行うことになるため、煩雑な作業を要する。また、工期が長くなってしまい、その間の吊り橋の使用が制限される期間が長期になってしまうおそれがある。 However, since erection work is performed for each of the temporary cable and the new main cable, complicated work is required. In addition, the construction period may become long, and the period during which the use of the suspension bridge is restricted may become long.

そこで、この発明は、煩雑な作業を極力なくして、工期の短縮化を図れる吊り橋の主ケーブルの取替方法を提供することを目的としている。 Therefore, an object of the present invention is to provide a method for replacing a main cable of a suspension bridge, which can shorten the construction period by eliminating complicated work as much as possible.

前記目的を達成するための技術的手段として、この発明に係る吊り橋の主ケーブルの取替方法は、主塔間に掛け渡された主ケーブルに垂下されたハンガーロープに補剛桁が保持された吊り橋の前記主ケーブルの取替方法において、前記補剛桁に配された床版を交換し、前記主塔と補剛桁とに斜吊りケーブルを架け渡して補剛桁を保持させ、前記ハンガーロープを取り外し、既設の主ケーブルを新設の主ケーブルに取り替えて、新規のハンガーロープを取り付けて、新設の主ケーブルによって前記補剛桁を保持させ、前記斜吊りケーブルを取り外してなることを特徴としている。 As a technical means for achieving the above object, in the method of replacing the main cable of the suspension bridge according to the present invention, the stiffening girder is held by a hanger rope suspended from the main cable hung between the main towers. In the method of replacing the main cable of the suspension bridge, the floor slab arranged on the stiffening girder is replaced , an oblique suspension cable is laid between the main tower and the stiffening girder to hold the stiffening girder, and the hanger. The feature is that the rope is removed, the existing main cable is replaced with a new main cable, a new hanger rope is attached, the stiffening girder is held by the new main cable, and the oblique suspension cable is removed. There is.

前記斜吊りケーブルで主塔に補剛桁を保持させることによって、主ケーブルを補剛桁の保持状態から解放できるようにしたものである。また、主ケーブルの取り替えと共に、床版等の他の構造要素の取り替えを行うものである。
すなわち、補剛桁から既設の床版を取り外した後に、新たな床版を設置し、斜吊りケーブルを架け渡して補剛桁を保持させる。ハンガーロープを取り外して既設の主ケーブルを撤去する。新たな主ケーブルを架設して新たなハンガーロープを取り付け、これらに補剛桁を支持させる。次いで、斜吊りケーブルを撤去する。
By having the main tower hold the stiffening girder with the oblique suspension cable, the main cable can be released from the holding state of the stiffening girder. In addition to replacing the main cable, other structural elements such as the floor slab are also replaced.
That is, after removing the existing floor slab from the stiffening girder, a new floor slab is installed, and an oblique suspension cable is hung to hold the stiffening girder. Remove the hanger rope and remove the existing main cable. A new main cable is erected and a new hanger rope is attached to support the stiffening girder. Then, the oblique suspension cable is removed.

また、請求項2の発明に係る吊り橋の主ケーブルの取替方法は、前記主塔の外側に斜吊り用鉄塔を設置し、前記主塔に替えて該斜吊り用鉄塔と前記補剛桁とに前記斜吊りケーブルを掛け渡したことを特徴としている。 Further, in the method of replacing the main cable of the suspension bridge according to the invention of claim 2, a steel tower for oblique suspension is installed outside the main tower, and the steel tower for oblique suspension and the stiffening girder are used instead of the main tower. It is characterized in that the oblique suspension cable is hung on the.

既設の主塔に斜吊りケーブルを取り付けて補剛桁を保持させた場合に、該主塔に十分な強度を得られないおそれがある場合には、斜吊りケーブルを取り付けるための斜吊り用鉄塔を設置することで、主塔に負担をかけないようにしたものである。 If there is a risk that sufficient strength cannot be obtained from the main tower when the stiffening girder is held by attaching the oblique suspension cable to the existing main tower, the oblique suspension steel tower for attaching the oblique suspension cable By installing the above, the main tower is not burdened.

また、請求項3の発明に係る吊り橋の主ケーブルの取替方法は、前記補剛桁の下部にアウターケーブルを配設し、該アウターケーブルに前記斜吊りケーブルを連繋させたことを特徴としている。 Further, the method of replacing the main cable of the suspension bridge according to the invention of claim 3 is characterized in that an outer cable is arranged under the stiffening girder and the oblique suspension cable is connected to the outer cable. ..

斜吊りケーブルの本数や補剛桁への取付位置によっては安定して補剛桁を保持できない場合には、補剛桁の下部にアウターケーブルを配設して、これに斜吊りケーブルを連繋させることで、斜吊りケーブルにかかる力を分散させて、補剛桁を安定して保持できるようにしたものである。 If the stiffening girder cannot be held stably depending on the number of slanted cables and the mounting position on the stiffening girder, arrange an outer cable under the stiffening girder and connect the slanted hanging cable to it. As a result, the force applied to the oblique suspension cable is dispersed so that the stiffening girder can be stably held.

この発明に係る吊り橋の主ケーブルの取替方法によれば、主ケーブルの交換に先立って、斜吊りケーブルによって補剛桁を保持させるから、主ケーブルの架設施工が一度でよい。このため、仮ケーブルを架設施工する煩雑な作業を行うことがなく、取り替え作業に要する工期の短縮化を図ることができる。 According to the method for replacing the main cable of the suspension bridge according to the present invention, since the stiffening girder is held by the oblique suspension cable prior to the replacement of the main cable, the main cable may be erected only once. Therefore, it is possible to shorten the construction period required for the replacement work without performing the complicated work of erection of the temporary cable.

主ケーブルを取り替える状態にある吊り橋の側面図である。It is a side view of a suspension bridge in a state where the main cable is replaced. 補剛桁に設置されている床版を取り替える状態を示す吊り橋の側面図である。It is a side view of the suspension bridge which shows the state which replaces the floor slab installed in the stiffening girder. 主塔と補剛桁とに斜吊りケーブルを架け渡す状態を示す吊り橋の側面図である。It is a side view of a suspension bridge showing a state in which an oblique suspension cable is bridged between a main tower and a stiffening girder. ハンガーロープを取り外す状態を示す吊り橋の側面図である。It is a side view of the suspension bridge which shows the state which removes a hanger rope. 主ケーブルを取り替える状態を示す吊り橋の側面図である。It is a side view of the suspension bridge which shows the state which replaces a main cable. ハンガーロープを取り付ける状態を示す吊り橋の側面図である。It is a side view of the suspension bridge which shows the state which attaches the hanger rope. 斜吊りケーブルを取り外す際の状態を示す吊り橋の側面図である。It is a side view of the suspension bridge which shows the state when the oblique suspension cable is removed.

以下、図示した実施の形態に基づいてこの発明に係る吊り橋の主ケーブルの取替方法を具体的に説明する。 Hereinafter, a method of replacing the main cable of the suspension bridge according to the present invention will be specifically described based on the illustrated embodiment.

図1に示すように、吊り橋1は両側に設けられた主塔2、2に主ケーブル3が架設され、この主ケーブル3にハンガーロープ4が取り付けられて垂下され、該ハンガーロープ4によって補剛桁5が支持されている。また、補剛桁5には床版6が載置されて通行路が設置されている。 As shown in FIG. 1, in the suspension bridge 1, a main cable 3 is erected on main towers 2 and 2 provided on both sides, a hanger rope 4 is attached to the main cable 3 and hung, and the hanger rope 4 stiffens the suspension bridge 1. Digit 5 is supported. Further, a floor slab 6 is placed on the stiffening girder 5 and a passage is provided.

主ケーブル3を取り外すのに先立って、床版6や高欄を取り外す。このとき、これらの荷重が取り除かれることにより補剛桁5等が主ケーブル3の張力により浮き上がるおそれがある。この場合には、補剛桁5と橋脚7との間に仮受8を介在させて、浮き上がった状態の補剛桁5を支承させる。 Prior to removing the main cable 3, the floor slab 6 and the balustrade are removed. At this time, when these loads are removed, the stiffening girder 5 and the like may be lifted by the tension of the main cable 3. In this case, a temporary receiver 8 is interposed between the stiffening girder 5 and the pier 7, and the stiffening girder 5 in a raised state is supported.

次いで、図2に示すように、補剛桁5に新たな床版9を設置する。この場合、例えば、既設の吊り橋1の床版6にコンクリート床版が設置されている構造では、これを鋼床版に変更することで橋体の軽量化を図ることも可能である。また、床版9を設置する場合には、重機10により片押し架設によることができる。 Next, as shown in FIG. 2, a new floor slab 9 is installed on the stiffening girder 5. In this case, for example, in a structure in which a concrete floor slab is installed on the floor slab 6 of the existing suspension bridge 1, it is possible to reduce the weight of the bridge body by changing this to a steel floor slab. Further, when the floor slab 9 is installed, the heavy machine 10 can be used for one-sided erection.

床版9が設置された状態で、図3に示すように、主塔2と補剛桁5とに斜吊りケーブル11を掛け渡して補剛桁5を主塔2に保持させる。この場合、斜吊りケーブル11は補剛桁5の下弦材部に固定することが好ましい。また、必要に応じて補剛桁5の下部にアウターケーブル12を張設してこれに斜吊りケーブル11を連繋させて、斜吊りケーブル11にかかる力を分散させる。さらに、主塔2の外側に斜吊り用鉄塔13を設置して、主塔2に替えて該斜吊り用鉄塔13に斜吊りケーブル11を支持させることもできる。 With the floor slab 9 installed, as shown in FIG. 3, the oblique suspension cable 11 is hung between the main tower 2 and the stiffening girder 5 to hold the stiffening girder 5 in the main tower 2. In this case, the oblique suspension cable 11 is preferably fixed to the lower chord member portion of the stiffening girder 5. Further, if necessary, an outer cable 12 is stretched under the stiffening girder 5 and the oblique suspension cable 11 is connected to the outer cable 12 to disperse the force applied to the oblique suspension cable 11. Further, it is also possible to install an oblique suspension tower 13 on the outside of the main tower 2 and have the oblique suspension cable 11 support the oblique suspension cable 11 instead of the main tower 2.

斜吊りケーブル11が掛け渡された状態で、図4に示すように、ハンガーロープ4を解体する。このとき、高所作業車15と引付け用仮ロープ16を使用して負荷状態で解体する。なお、橋体の死荷重にトラスの強度が十分に対抗するように、必要に応じて補強する。 As shown in FIG. 4, the hanger rope 4 is disassembled with the oblique suspension cable 11 hung. At this time, the aerial work platform 15 and the temporary rope for attraction 16 are used to disassemble under load. If necessary, reinforce the truss so that the strength of the truss can sufficiently counter the dead load of the bridge.

ハンガーロープ4を解体した後、主ケーブル3を取り替える。この取付作業は、図5に示すように、ウィンチ14を用いて既設の主ケーブル3を解体すると共に、新設の主ケーブル3を架設する。 After disassembling the hanger rope 4, the main cable 3 is replaced. In this attachment work, as shown in FIG. 5, the existing main cable 3 is disassembled using the winch 14, and the new main cable 3 is erected.

架設された新規の主ケーブル3に、図6に示すように、新たなハンガーロープ4を垂下させ、その下端部に補剛桁5を支持させる。この際、新設された前記床版9の荷重に応じてハンガーロープ4の仕様を適合させる。 As shown in FIG. 6, a new hanger rope 4 is hung on the newly erected main cable 3, and a stiffening girder 5 is supported at the lower end thereof. At this time, the specifications of the hanger rope 4 are adapted according to the load of the newly installed floor slab 9.

その後、前記斜吊りケーブル11を撤去し、必要に応じて設置した斜吊り用鉄塔13を撤去する。 After that, the oblique suspension cable 11 is removed, and the oblique suspension tower 13 installed as needed is removed.

この発明に係る吊り橋の主ケーブルの取替方法によれば、既設の主ケーブルに沿って架設する仮ケーブルに替えて斜吊りケーブルを設けて新設の主ケーブルを架設するため、仮ケーブルの架設作業がなく、煩雑な作業を減じて主ケーブルの取替施工を行えるので、工期の短縮化を図れると共に、取替施工に要する費用を削減できて、吊り橋の主ケーブルの取替の促進を図ることに寄与する。 According to the method for replacing the main cable of the suspension bridge according to the present invention, the temporary cable is erected in order to install the new main cable by providing the oblique suspension cable instead of the temporary cable erected along the existing main cable. Since there is no need to do so, the main cable can be replaced by reducing complicated work, so the construction period can be shortened, the cost required for the replacement work can be reduced, and the replacement of the main cable of the suspension bridge can be promoted. Contribute to.

1 吊り橋
2 主塔
3 主ケーブル
4 ハンガーロープ
5 補剛桁
6 床版
7 橋脚
8 仮受
9 床版
10 重機
11 斜吊りケーブル
12 アウターケーブル
13 斜吊り用鉄塔
14 ウィンチ
1 Suspension bridge 2 Main tower 3 Main cable 4 Hanger rope 5 Stiffening girder 6 Floor slab 7 Pier 8 Temporary receiver 9 Floor slab
10 heavy equipment
11 Oblique cable
12 outer cable
13 Slanted tower
14 winch

Claims (3)

主塔間に掛け渡された主ケーブルに垂下されたハンガーロープに補剛桁が保持された吊り橋の前記主ケーブルの取替方法において、
前記補剛桁に配された床版を交換し、
前記主塔と補剛桁とに斜吊りケーブルを架け渡して補剛桁を保持させ、
前記ハンガーロープを取り外し、
既設の主ケーブルを新設の主ケーブルに取り替えて、
新規のハンガーロープを取り付けて、新設の主ケーブルによって前記補剛桁を保持させ、
前記斜吊りケーブルを取り外してなることを特徴とする吊り橋の主ケーブルの取替方法。
In the method of replacing the main cable of a suspension bridge in which a stiffening girder is held by a hanger rope suspended from a main cable hung between the main towers.
Replace the floor slab placed on the stiffening girder and replace it.
An oblique suspension cable is laid between the main tower and the stiffening girder to hold the stiffening girder.
Remove the hanger rope and
Replace the existing main cable with a new main cable,
A new hanger rope is attached and the stiffening girder is held by the new main cable.
A method for replacing a main cable of a suspension bridge, which comprises removing the oblique suspension cable.
前記主塔の外側に斜吊り用鉄塔を設置し、前記主塔に替えて該斜吊り用鉄塔と前記補剛桁とに前記斜吊りケーブルを掛け渡したことを特徴とする請求項1に記載の吊り橋の主ケーブルの取替方法。 Claim 1 established the oblique hanging tower to the outside of the main column, characterized in that spanned the swash hanging cable instead of the main tower and the the tower for hanging swash HoTsuyoshiketa How to replace the main cable of the suspension bridge. 前記補剛桁の下部にアウターケーブルを配設し、該アウターケーブルに前記斜吊りケーブルを連繋させたことを特徴とする請求項1または請求項2に記載の吊り橋の主ケーブルの取替方法。 The method for replacing a main cable of a suspension bridge according to claim 1 or 2 , wherein an outer cable is arranged below the stiffening girder and the oblique suspension cable is connected to the outer cable.
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CN110593138A (en) * 2018-06-12 2019-12-20 王双其 Method for replacing main cable of suspension bridge
CN109914273B (en) * 2019-03-20 2023-11-21 中交路桥建设有限公司 Device and method for replacing riding type sling of suspension bridge
CN110820524B (en) * 2019-11-22 2020-12-29 柳州欧维姆机械股份有限公司 Connecting structure, fixing structure, new main cable system and construction method for replacing main cable of suspension bridge
CN110820522A (en) * 2019-11-22 2020-02-21 柳州欧维姆机械股份有限公司 Sling conversion device for replacing main cable of suspension bridge, sling and construction method
CN110820521B (en) * 2019-11-22 2025-04-11 柳州欧维姆机械股份有限公司 Cable strand connection structure, anchorage structure and construction method for replacing main cable of suspension bridge
CN110820523B (en) * 2019-11-22 2020-12-29 柳州欧维姆机械股份有限公司 Cable strand connecting structure for replacing main cable of suspension bridge, anchorage structure and construction method
KR102232982B1 (en) * 2019-12-19 2021-03-29 주식회사 케이블브릿지 Suspension pedestrian bridge using segment girder with truss structure
KR102162535B1 (en) * 2019-12-23 2020-10-08 주식회사 케이블브릿지 Two-story suspension pdedstrian bridge with improved performance against wind force
CN111455862B (en) * 2020-04-30 2022-03-25 中铁大桥科学研究院有限公司 Construction method of continuous stiffening beam suspension bridge
CN111553015B (en) * 2020-05-14 2022-08-30 广西交科集团有限公司 Accurate displacement control method in replacement process of arch bridge suspender
CN112144422B (en) * 2020-09-15 2022-05-03 中国电建市政建设集团有限公司 Construction method for dismantling temporary support system of large-span ultra-wide continuous steel box girder

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