JP6434300B2 - How to dismantle and remove a flip-up rotary bridge - Google Patents

How to dismantle and remove a flip-up rotary bridge Download PDF

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JP6434300B2
JP6434300B2 JP2014260707A JP2014260707A JP6434300B2 JP 6434300 B2 JP6434300 B2 JP 6434300B2 JP 2014260707 A JP2014260707 A JP 2014260707A JP 2014260707 A JP2014260707 A JP 2014260707A JP 6434300 B2 JP6434300 B2 JP 6434300B2
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dismantling
bridge
girder
flip
rotary
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JP2016121453A (en
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吉川　卓
卓 吉川
健悟 原
健悟 原
一徳 川端
一徳 川端
日出幸 小西
日出幸 小西
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Oriental Shiraishi Corp
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本発明は、線路を跨ぐ跨線橋、道路を跨ぐ跨道橋、渓谷に架かる橋などの橋の解体・撤去方法に関するものである。   The present invention relates to a method for dismantling / removing a bridge such as a bridge over a railway track, a bridge over a road, and a bridge over a valley.

橋の老朽化や拡張などの架け替えの要請等により、種々の方法により既設の橋の解体・撤去工事が行われている。従来の中小規模の上路アーチ橋等の橋の解体・撤去方法では、一般的に、足場や解体時に桁を下方から支持する固定支保工等を設置したうえ、補剛桁や鉛直材を撤去した後、桁等をカッター等で切断し、切断したピース毎に大型のクレーン等で揚重・移動させて、解体工事等を行う橋と接続している道路や交差する道路等からそれらのピースをトラックやトレーラ等で運搬・排出するようにして解体・撤去工事が行われていた。   In response to requests for replacement of bridges such as aging and expansion, dismantling and removal of existing bridges is being carried out in various ways. In the conventional method of dismantling / removing bridges such as small and medium-sized upper arch bridges, in general, fixed scaffolds that support the girder from below are installed during scaffolding and dismantling, and stiffening girders and vertical members are removed. After that, cut the girders with a cutter, etc., lift and move each cut piece with a large crane, etc., and remove those pieces from the road connected to the bridge where the demolition work etc. is done or the intersecting road etc. Demolition and removal work was carried out by transporting and discharging with trucks and trailers.

しかし、線路を跨ぐ跨線橋、道路を跨ぐ跨道橋などの解体・撤去工事では、橋と交差する道路や線路が長期間通行止めを余儀なくされるか、足場や支保工等で道路等の一部を占拠したうえ、安全を確保する観点から、解体・切断したピースを移動させる際には、これらの道路や線路を通行止めにしなければならないという問題があった。また、桁下の地面から橋梁までの高さが高い場合や、河川や渓谷に架かる橋などの橋の立地条件によっては、そもそも橋の下に足場や支保工、クレーンなどの大型の揚重装置等を、搬入したり、設置したりすることが非常に困難であるという問題もあった。   However, in the dismantling / removal work such as overpasses that cross the tracks and overpasses that cross the roads, the roads and tracks crossing the bridges are forced to be closed for a long time, or some of the roads etc. From the viewpoint of securing the occupation, there was a problem that when the pieces that were disassembled and cut were moved, these roads and tracks had to be closed. In addition, depending on the height from the ground under the girder to the bridge, or depending on the location conditions of the bridge such as a bridge over a river or a valley, a large lifting device such as a scaffold, a supporter, a crane, etc. There is also a problem that it is very difficult to carry in or install them.

例えば、特許文献１には、アーチ橋１０の補剛桁２０および鉛直材１８Ｌ１等の少なくとも一部を解体した後、アーチ橋１０のアーチリブ１６を、アーチリブ１６の一端部近傍部位において切断するとともに、該一端部に位置するアーチアバット１４Ｌ，１４Ｒの近傍に、鉛直軸線回りに回転可能な支承治具１０８を設置して、この支承治具１０８によりアーチリブ１６を支持するようにし、次に、アーチリブ１６の上方に外ケーブル１１４を配置して、外ケーブル１１４の先端部をアーチリブ１６の他端部近傍部位に定着するとともに、外ケーブル１１４の基端部を上記一端部側の所定位置に設置された定着用治具１０２に定着し、そして、この外ケーブル１１４を緊張した後、アーチリブ１６を外ケーブル１１４の先端部の定着位置よりも上記他端部側において切断し、その後、アーチリブ１６を、上記鉛直軸線回りに上記一端部側の地盤近傍まで旋回させるアーチ橋の解体撤去方法が開示されている（特許文献１の特許請求の範囲の請求項１、明細書の段落００３２〜００４９、図面の図２〜図７等参照）。   For example, in Patent Document 1, after disassembling at least part of the stiffening girder 20 and the vertical member 18L1 of the arch bridge 10, the arch rib 16 of the arch bridge 10 is cut at a portion near one end of the arch rib 16, In the vicinity of the arch abutment 14L, 14R located at the one end, a support jig 108 that can rotate around the vertical axis is installed, and the arch rib 16 is supported by the support jig 108. Next, the arch rib 16 The outer cable 114 is disposed above the upper end of the outer cable 114 to fix the distal end of the outer cable 114 to the vicinity of the other end of the arch rib 16, and the base end of the outer cable 114 is installed at a predetermined position on the one end side. After fixing to the fixing jig 102 and tensioning the outer cable 114, the arch rib 16 is moved from the fixing position at the tip of the outer cable 114. A method of dismantling and removing the arch bridge is disclosed in which the arch rib 16 is cut around the other end side and then the arch rib 16 is swung around the vertical axis to the vicinity of the ground on the one end side (Patent Document 1 claims) (See claim 1, paragraphs 0032 to 0049 of the specification, and FIGS. 2 to 7 of the drawings).

しかし、特許文献１に記載のアーチ橋の解体撤去方法では、アーチ橋にしか適用できず、その他の橋、例えば、単純桁橋、トラス橋、斜張橋等には適用できないという問題があった。また、支保工の設置を不要にして、橋の下を通過する道路の通行止め期間を従来に比して大幅に短縮することができるとされているものの、特許文献１に記載のアーチ橋の解体撤去方法では、アーチリブ１６を旋回する際には、道路を通行止めにしなければならず、前記問題の解決も不十分であった。   However, the method of dismantling and removing the arch bridge described in Patent Document 1 is applicable only to arch bridges, and not applicable to other bridges such as simple girder bridges, truss bridges, cable stayed bridges, and the like. . Moreover, although it is said that it is possible to significantly reduce the road closure period of the road passing under the bridge as compared with the prior art without the need for a support construction, the dismantling of the arch bridge described in Patent Document 1 In the removal method, when the arch rib 16 is turned, the road must be closed, and the solution of the problem is insufficient.

また、特許文献２には、車両走行路等７２に跨線道７１を立体交差させるために設けられた既設橋桁１の上に、跨線道７１のスペースを利用してエレクションガーダー等の架設桁２を送り出して配置し、既設橋桁１の軸方向に所定のピッチで配置された仮吊り梁６および吊鋼棒５を介して既設橋桁１を架設桁２に支持させ、既設橋桁１を隣り合う一対の仮吊り梁６（吊鋼棒５）を含むように複数の桁ブロック１ｂに切断し、桁ブロック１ｂの一対の仮吊り梁６に下部吊り金具１３を嵌合させて移動吊り装置３により個別に吊り上げ、吊鋼棒５の架設桁２の側の連結を解除して、跨線道７１または車両走行路等７２に待機する車両に積み込んで撤去する既設橋梁の撤去方法等が開示されている（特許文献１の特許請求の範囲の請求項１、２、明細書の段落００２７〜００３６、図面の図９Ａ〜図１０Ｃ等参照）。   Further, Patent Document 2 discloses that an installation girder such as an erection girder is used on the existing bridge girder 1 provided to make a three-dimensional crossing of the overpass 71 on the vehicle traveling road 72 or the like. 2 is sent out, and the existing bridge girder 1 is supported by the installation girder 2 via the temporary suspension beams 6 and the suspended steel rods 5 arranged at a predetermined pitch in the axial direction of the existing bridge girder 1, and the existing bridge girder 1 is adjacent. A plurality of girder blocks 1b are cut so as to include a pair of temporary suspension beams 6 (suspended steel rods 5), and a lower suspension fitting 13 is fitted to the pair of temporary suspension beams 6 of the girder block 1b. A method of removing an existing bridge, which is individually lifted, released from the side of the erection beam 2 of the suspension steel bar 5 and loaded onto a vehicle waiting on the overpass 71 or the vehicle traveling path 72, etc. is disclosed. (Claims 1 and 2 of the claims of Patent Document 1, Book of paragraphs 0027 to 0036, see Figure 9A~ to 10C, etc. of the drawing).

しかし、特許文献２に記載の既設橋梁の撤去方法では、跨線道７１のスペースを利用してエレクションガーダー等の架設桁２を送り出して配置し、既設橋桁１の軸方向に所定のピッチで配置された仮吊り梁６および吊鋼棒５を介して既設橋桁１を架設桁２に支持させるので、橋下の道路を使用するものであり、前記問題の解決も不十分であるだけでなく、橋の解体に際して架設桁２を新たに架けなければならないという問題があった。このため、解体作業を始める前に工期が大幅に掛かり、費用も嵩んでしまうという問題があった。   However, in the method for removing the existing bridge described in Patent Document 2, the installation girder 2 such as an erection girder is sent out using the space of the overpass 71 and arranged at a predetermined pitch in the axial direction of the existing bridge girder 1. Since the existing bridge girder 1 is supported by the installation girder 2 via the suspended suspension beam 6 and the suspended steel bar 5, the road under the bridge is used and not only is the solution of the problem insufficient, but also the bridge There was a problem that a new installation girder 2 had to be installed when dismantling. For this reason, there was a problem that the construction period was significantly increased before the dismantling work was started, and the cost was increased.

特開２００７−１２６９０９号公報JP 2007-126909 A 特開２０１４−６６００７号公報JP 2014-66007 A

そこで、本発明は、前述した問題に鑑みて案出されたものであり、その目的とするところは、橋と交差する道路や線路の通行止めの時間の短縮を図り、橋の立地条件等にも左右されることなく解体・撤去作業をすることができ、且つ、工期を短縮してコストダウンを図ることのできる橋の解体・撤去方法を提供することにある。   Therefore, the present invention has been devised in view of the above-mentioned problems, and the object of the present invention is to reduce the time for closing roads and tracks crossing the bridge, and to the location conditions of the bridge, etc. An object of the present invention is to provide a method for dismantling / removing a bridge that can be dismantled / removed without being affected, and that can shorten the construction period and reduce costs.

請求項１記載の跳ね上げ回転式橋の解体・撤去方法は、橋を解体して撤去する橋の解体・撤去方法であって、前記橋の桁を切断する桁切断工程と、前記橋の橋脚下部又はアーチリブ下部の回転ヒンジを軸として前記桁を上方へ跳ね上げて回転させ橋台側へ引き寄せる桁回転工程と、を有し、前記橋脚下部又はアーチリブに強度的な弱点部分を形成するか、又は、新たなピン支承機構を設置して前記桁を上方へ跳ね上げて回転させる回転ヒンジを形成する回転ヒンジ形成工程を有することを特徴とする。 The dismantling / removal method of the flip-up rotary bridge according to claim 1 is a dismantling / removal method of a bridge that dismantles and removes the bridge, the girder cutting step of cutting the bridge girder, and the bridge pier or possess the digits rotation step to draw the lower or Achiribu bottom of the rotating hinge is rotated flipped the digits upward an axis to abutment side, and to form a strength weakness portion to the pier bottom or Achiribu, or The method further comprises the step of forming a rotating hinge for forming a rotating hinge for installing a new pin support mechanism and flipping the beam upward to rotate it.

第２発明に係る跳ね上げ回転式橋の解体・撤去方法は、第１発明において、前記桁回転工程の前に、前記桁を上方へ跳ね上げて回転させる回転ヒンジを形成する回転ヒンジ形成工程を有することを特徴とする。   The dismantling / removal method of the flip-up rotary bridge according to the second aspect of the present invention is the first aspect of the present invention, wherein the rotating hinge forming step of forming the rotating hinge for rotating the girder upward and rotating is performed before the beam rotating step. It is characterized by having.

第３発明に係る跳ね上げ回転式橋の解体・撤去方法は、第１発明又は第２発明において、前記桁切断工程前に、前記桁を引っ張って跳ね上げ回転させるための線材及びその反力台を設置する反力台設置工程を有することを特徴とする。   The dismantling / removal method of the flip-up rotary bridge according to the third aspect of the present invention is the wire rod for pulling up and rotating the girder before the girder cutting step and the reaction force base in the first or second aspect of the invention. It has the reaction stand installation process which installs.

第４発明に係る跳ね上げ回転式橋の解体・撤去方法は、第１発明ないし第３発明のいずれかの発明において、前記桁回転工程で桁を跳ね上げる方向とは逆の回転方向へ牽引する線材を前記桁に緊結する工程を有することを特徴とする。   The dismantling / removal method of the flip-up rotary bridge according to the fourth aspect of the present invention is the method according to any one of the first to third aspects of the invention, wherein the direction is pulled in the direction opposite to the direction in which the girders are flipped up in the girder rotation step. It has the process of fastening a wire to the said girder.

第５発明に係る跳ね上げ回転式橋の解体・撤去方法は、第１発明ないし第３発明のいずれかの発明において、前記桁回転工程で桁を跳ね上げる方向とは逆の回転方向へ押圧する支持装置を前記桁に取り付ける工程を有することを特徴とする。   The dismantling / removal method of the flip-up rotary bridge according to the fifth aspect of the present invention is the invention according to any one of the first to third aspects of the invention, wherein the direction of rotation of the girders is pushed in the direction opposite to the direction in which the girders are flipped up. It has the process of attaching a support apparatus to the said girder.

第６発明に係る跳ね上げ回転式橋の解体・撤去方法は、第１発明ないし第５発明のいずれかの発明において、前記回転ヒンジ形成工程前に、回転ヒンジを形成する時に前記桁の自重を支える仮支持部材を設置する仮支持部材設置工程を有することを特徴とする。   The dismantling / removal method of the flip-up rotary bridge according to the sixth invention is the invention according to any one of the first to fifth inventions, wherein the weight of the girder is reduced when the rotary hinge is formed before the rotary hinge forming step. It has the temporary support member installation process which installs the temporary support member to support.

第１発明〜第５発明によれば、跨線橋、跨道橋などの道路や線路と立体交差する橋の解体・撤去工事であっても、交差する道路や線路の通行止めを極力少なくすることができ、そのため、休日に作業したり反対に休日を除く日に作業をしたりしなければならないという作業日程の制約も受けにくい。また、桁下の地面から橋梁までの高さが高い場合や、河川や渓谷に架かる橋など足場や支保工を設置するのが困難な立地条件であっても、橋の解体・撤去作業をすることができる。 According to 1st invention- 5th invention, even if it is the dismantling and removal construction of the bridge | crossover which crosses a road and railroads, such as an overpass and an overpass, it can reduce as much as possible the closure of the road and railroad crossing. Therefore, it is difficult to be constrained by the work schedule, such as working on a holiday or working on a day other than a holiday. Also, dismantling / removing bridges even when the height from the underside of the girder to the bridge is high or it is difficult to install scaffolding or support such as bridges over rivers and valleys be able to.

また、第１発明〜第５発明によれば、足場や支保工の設置個所を極力少なくすることができるので、その分工期を短縮して解体・撤去作業のコストダウンを図ることができる。その上、跳ね上げるだけで、桁等の解体作業のしやすい場所で解体してすぐそばから解体した桁のピースを搬出することができるため、作業時間を短縮して解体・撤去作業のコストダウンを図ることができる。 In addition, according to the first to fifth inventions, the number of installation places for scaffolds and support works can be reduced as much as possible, so the work period can be shortened and the cost of dismantling / removal work can be reduced. In addition, by simply flipping up, it is possible to carry out the pieces of girders that have been dismantled in places that are easy to dismantle, such as girders. Can be achieved.

それに加え、第１発明〜第５発明によれば、前記桁回転工程の前に、前記橋脚下部又はアーチリブに強度的な弱点部分を形成するか、又は、新たなピン支承機構を設置して前記桁を上方へ跳ね上げて回転させる回転ヒンジを形成する回転ヒンジ形成工程を有するので、桁回転工程の際に、安全且つスムーズに桁を跳ね上げ回転させることができ、さらに作業時間を短縮して解体・撤去作業のコストダウンを図ることができる。 In addition, according to the first to fifth aspects of the present invention , before the beam rotating step , a strong weak point portion is formed on the lower part of the pier or the arch rib, or a new pin support mechanism is installed to Since it has a rotating hinge forming process that forms a rotating hinge that flips the girder upward and rotates it, the girder can be safely and smoothly flipped and rotated during the girder rotating process, further reducing work time Costs for dismantling and removal can be reduced.

特に、第２発明によれば、前記桁切断工程前に、前記桁を引っ張って跳ね上げ回転させるための線材及びその反力台を設置する反力台設置工程を有するので、反力台と線材で掛け止められており、後工程である桁切断工程において、切断した桁の一部が誤って落下してしまう事故を防ぐことができる。 In particular, according to the second aspect of the present invention, since there is a reaction force base installation step for installing the wire rod for pulling and rotating the girder up and rotating and the reaction force table before the beam cutting step, the reaction force table and the wire rod Thus, it is possible to prevent an accident in which a part of the cut girder is accidentally dropped in the girder cutting process, which is a subsequent process.

特に、第３、第４発明によれば、前記桁回転工程で桁を跳ね上げる方向とは逆の回転方向へ牽引する線材を前記桁に緊結する工程を有するか、又は、前記桁回転工程で桁を跳ね上げる方向とは逆の回転方向へ押圧する支持装置を前記桁に取り付ける工程を有するので、跳ね上げ回転させる桁の重心が回転ヒンジの軸を過ぎた場合でも、自重で加速して意図した位置より回転しすぎることを防止することができる。このため、より安全に橋の解体・撤去作業を行うことができる。 In particular, according to the third and fourth inventions, the step of tightening the wire rod pulled in the direction of rotation opposite to the direction in which the beam is flipped up in the beam rotating step, or the step of rotating the beam in the beam rotating step Since there is a step of attaching a support device that presses in the direction of rotation opposite to the direction in which the girders are flipped up, to the girders, even if the center of gravity of the girders to be flipped up and rotated passes through the axis of the rotary hinge, It is possible to prevent the motor from rotating more than the set position. For this reason, it is possible to dismantle and remove the bridge more safely.

特に、第５発明によれば、前記回転ヒンジ形成工程前に、回転ヒンジを形成する時に前記桁の自重を支える仮支持部材を設置する仮支持部材設置工程を有するので、桁等に回転ヒンジを形成する際に、解体中の桁が自重で崩壊したり落下したりすることを防止することができる。 In particular, according to the fifth aspect of the invention, there is a temporary support member installation step of installing a temporary support member that supports the weight of the girder when the rotary hinge is formed before the rotary hinge formation step. When forming, it is possible to prevent the girder being disassembled from collapsing or falling due to its own weight.

本発明の第１実施形態に係る跳ね上げ回転式橋の解体・撤去方法を適用するアーチ橋の解体・撤去工事の着工前を示す立面図である。It is an elevational view showing before the start of the dismantling / removal work of the arch bridge to which the dismantling / removal method of the flip-up rotary bridge according to the first embodiment of the present invention is applied. 本発明の第１実施形態に係る跳ね上げ回転式橋の解体・撤去方法の工程の概略を示すフローチャートである。It is a flowchart which shows the outline of the process of the dismantling and removal method of the flip-up rotary bridge which concerns on 1st Embodiment of this invention. 同上の跳ね上げ回転式橋の解体・撤去方法の補剛桁・鉛直材撤去工程を示す立面図である。It is an elevational view showing the stiffening girder / vertical material removal process of the dismantling / removal method of the flip-up rotary bridge. 同上の跳ね上げ回転式橋の解体・撤去方法の仮支持部材設置工程を示す立面図である。It is an elevation view which shows the temporary support member installation process of the dismantling and removal method of a flip-up rotary bridge same as the above. 図４のアーチアバット付近を拡大して示す部分拡大図である。It is the elements on larger scale which expand and show the arch abat vicinity of FIG. 同上の跳ね上げ回転式橋の解体・撤去方法の回転ヒンジ形成工程を示す立面図である。It is an elevation view which shows the rotation hinge formation process of the dismantling and removal method of a flip-up rotary bridge same as the above. 図６のアーチアバット付近を拡大して示す部分拡大図である。It is the elements on larger scale which expand and show the arch abat vicinity of FIG. 図６、図７に示すピン支承機構の構成を説明する構成説明図である。FIG. 8 is a configuration explanatory view illustrating the configuration of the pin support mechanism shown in FIGS. 6 and 7. 同上の跳ね上げ回転式橋の解体・撤去方法の反力台設置工程を示す立面図である。It is an elevation view which shows the reaction force stand installation process of the dismantling and removal method of a flip-up rotary bridge same as the above. 同上の跳ね上げ回転式橋の解体・撤去方法の桁切断工程を示す立面図である。It is an elevation view which shows the girder cutting process of the dismantling and removal method of a flip-up rotary bridge same as the above. 同上の跳ね上げ回転式橋の解体・撤去方法の桁回転工程を示す立面図である。It is an elevation view which shows the girder rotation process of the dismantling and removal method of a flip-up rotary bridge same as the above. 同上の跳ね上げ回転式橋の解体・撤去方法の桁解体・撤去工程を示す立面図である。It is an elevation view which shows the girder disassembly / removal process of the dismantling / removal method of the flip-up rotary bridge same as the above. 本発明の第２実施形態に係る跳ね上げ回転式橋の解体・撤去方法の工程の概略を示すフローチャートである。It is a flowchart which shows the outline of the process of the dismantling and removal method of the flip-up rotary bridge which concerns on 2nd Embodiment of this invention. 同上の跳ね上げ回転式橋の解体・撤去方法の回転ヒンジ形成工程を示す立面図である。It is an elevation view which shows the rotation hinge formation process of the dismantling and removal method of a flip-up rotary bridge same as the above. 図１４のアーチアバット付近を拡大して示す部分拡大図である。It is the elements on larger scale which expand and show the arch abat vicinity of FIG. 同上の回転ヒンジ形成工程の別例を示す立面図である。It is an elevation view which shows another example of a rotation hinge formation process same as the above. 図１６のアーチアバット付近を拡大して示す部分拡大図である。It is the elements on larger scale which expand and show the arch abat vicinity of FIG. 同上の跳ね上げ回転式橋の解体・撤去方法の桁下端切断・撤去工程を示す立面図である。It is an elevation view which shows the girder lower end cutting / removal process of the dismantling / removal method of the flip-up rotary bridge same as the above. 本発明の第３実施形態に係る跳ね上げ回転式橋の解体・撤去方法を適用するアーチ橋の解体・撤去工事の着工前を示す立面図である。It is an elevational view before the start of the dismantling / removal work of the arch bridge to which the dismantling / removal method of the flip-up rotary bridge according to the third embodiment of the present invention is applied. 本発明の第３実施形態に係る跳ね上げ回転式橋の解体・撤去方法の工程の概略を示すフローチャートである。It is a flowchart which shows the outline of the process of the dismantling and removal method of the flip-up rotary bridge which concerns on 3rd Embodiment of this invention. 同上の跳ね上げ回転式橋の解体・撤去方法の桁側径間撤去工程を示す立面図である。It is an elevation view which shows the girder side span removal process of the dismantling / removal method of a flip-up rotary bridge same as the above. 同上の跳ね上げ回転式橋の解体・撤去方法の仮支持部材設置工程を示す立面図である。It is an elevation view which shows the temporary support member installation process of the dismantling and removal method of a flip-up rotary bridge same as the above. 図２２のアーチアバット付近を拡大して示す部分拡大図である。It is the elements on larger scale which expand and show the arch abat vicinity of FIG. 同上の跳ね上げ回転式橋の解体・撤去方法の回転ヒンジ形成工程を示す立面図である。It is an elevation view which shows the rotation hinge formation process of the dismantling and removal method of a flip-up rotary bridge same as the above. 図２４のアーチアバット付近を拡大して示す部分拡大図である。It is the elements on larger scale which expand and show the arch abat vicinity of FIG. 同上の跳ね上げ回転式橋の解体・撤去方法の反力台設置工程を示す立面図である。It is an elevation view which shows the reaction force stand installation process of the dismantling and removal method of a flip-up rotary bridge same as the above. 同上の跳ね上げ回転式橋の解体・撤去方法の桁切断工程を示す立面図である。It is an elevation view which shows the girder cutting process of the dismantling and removal method of a flip-up rotary bridge same as the above. 同上の跳ね上げ回転式橋の解体・撤去方法の桁回転工程を示す立面図である。It is an elevation view which shows the girder rotation process of the dismantling and removal method of a flip-up rotary bridge same as the above. 同上の桁回転工程の回転中心を過ぎた後の工程を示す立面図である。It is an elevation view which shows the process after passing the rotation center of the same girder rotation process. 同上の工程の別例を橋台付近を拡大して示す部分拡大図である。It is the elements on larger scale which expand and show another example of a process same as the above. 同上の跳ね上げ回転式橋の解体・撤去方法の桁解体・撤去工程を橋台付近を拡大して示す部分拡大図である。It is the elements on larger scale which expand the vicinity of an abutment and show the girder disassembly and removal process of the dismantling and removal method of a flip-up rotary bridge same as the above. 同上の工程の別例を示す部分拡大図である。It is the elements on larger scale which show another example of a process same as the above. 同上の工程の別例の切断・回転後を示す部分拡大図である。It is the elements on larger scale which show the cutting / rotation of another example of a process same as the above.

以下、本発明に係る跳ね上げ回転式橋の解体・撤去方法を実施するための一実施形態について、図面を参照しながら詳細に説明する。なお、既設構造物として道路と交差する道路橋を例示して説明する。   Hereinafter, an embodiment for carrying out the dismantling / removal method of a flip-up rotary bridge according to the present invention will be described in detail with reference to the drawings. In addition, the road bridge which crosses a road is illustrated and demonstrated as an existing structure.

［第１実施形態］
図１〜図１２を用いて、第１実施形態に係る跳ね上げ回転式橋の解体・撤去方法について説明する。第１実施形態に係る跳ね上げ回転式橋の解体・撤去方法は、本発明に係る跳ね上げ回転式橋の解体・撤去方法を、アーチ橋を解体・撤去する場合に適用したものであり、このアーチ橋Ｂ１は、道路Ｒ１の上に立体交差する道路Ｒ２としてかけられた上路開腹式の鉄筋コンクリート製の跨道橋である。 [First Embodiment]
The dismantling / removal method of the flip-up rotary bridge according to the first embodiment will be described with reference to FIGS. The dismantling / removal method of the flip-up rotary bridge according to the first embodiment is an application of the dismantling / removal method of the flip-up rotary bridge according to the present invention to dismantling / removing the arch bridge. The arch bridge B <b> 1 is an upper lap type reinforced concrete overpass bridge that is hung as a road R <b> 2 crossing the road R <b> 1 three-dimensionally.

先ず、解体前のアーチ橋Ｂ１の構成について、図１を用いて、簡単に説明する。図示アーチ橋Ｂ１は、道路Ｒ１の法面に、左右一対のアーチアバットＢ１０、Ｂ１１が形成され、これらのアーチアバットＢ１０、Ｂ１１間に主桁であるアーチリブＢ１２が架け渡されている。そして、このアーチリブＢ１２上に、複数の鉛直材Ｂ１３を介してアーチリブＢ１２に支持された補剛桁Ｂ１４が、道路Ｒ１の法面の上部に形成された左右一対の橋台Ｂ１５、Ｂ１６間に架け渡されている。   First, the configuration of the arch bridge B1 before dismantling will be briefly described with reference to FIG. In the illustrated arch bridge B1, a pair of left and right arch abutments B10 and B11 are formed on the slope of the road R1, and an arch rib B12 which is a main girder is bridged between the arch abutments B10 and B11. And on this arch rib B12, the stiffening girder B14 supported by the arch rib B12 via a plurality of vertical members B13 is bridged between a pair of left and right abutments B15, B16 formed at the upper part of the slope of the road R1. Has been.

図２に示すように、第１実施形態に係る跳ね上げ回転式橋の解体・撤去方法は、補剛桁・鉛直材撤去工程Ｓ１と、仮支持部材設置工程Ｓ２と、回転ヒンジ形成工程Ｓ３と、反力台設置工程Ｓ４と、桁切断工程Ｓ５と、桁回転工程Ｓ６、桁解体・撤去工程Ｓ７など、の工程を備えたアーチ橋を解体・撤去する方法である。   As shown in FIG. 2, the disassembly / removal method of the flip-up rotary bridge according to the first embodiment includes a stiffening girder / vertical material removal step S1, a temporary support member installation step S2, and a rotary hinge formation step S3. This is a method of dismantling / removing an arch bridge comprising steps such as a reaction force table installation step S4, a girder cutting step S5, a girder rotation step S6, and a girder disassembly / removal step S7.

（１）補剛桁・鉛直材撤去工程
先ず、第１実施形態に係る跳ね上げ回転式橋の解体・撤去方法では、図３に示すように、破線で示した部分の補剛桁Ｂ１４と、それを支える鉛直材Ｂ１３を解体して、アーチ橋Ｂ１に続く左右の道路Ｒ２等から搬出・撤去する補剛桁・鉛直材撤去工程Ｓ１を行う。本工程では、補剛桁Ｂ１４と鉛直材Ｂ１３の全部を撤去する必要はなく、図の破線で示したように、後述の桁回転工程Ｓ６の際に桁の回転に支障のない橋の両端部に位置する補剛桁及び鉛直材は残置する。補剛桁Ｂ１４とその上の道路を残しておけば、主桁であるアーチリブＢ１２の搬出・撤去の際の足場や搬出路として使用でき、搬出・撤去が容易となるからである。 (1) Stiffening Girder / Vertical Material Removal Step First, in the dismantling / removal method of the flip-up rotary bridge according to the first embodiment, as shown in FIG. The vertical material B13 that supports it is dismantled and a stiffening girder / vertical material removal step S1 is carried out and removed from the left and right roads R2 etc. following the arch bridge B1. In this step, it is not necessary to remove all of the stiffening girders B14 and the vertical members B13, and as shown by broken lines in the figure, both ends of the bridge that do not interfere with the rotation of the girders in the later-described girder rotation step S6 The stiffening girder and the vertical member located in are left behind. This is because if the stiffening girder B14 and the road above it are left, it can be used as a scaffold or a carry-out path for carrying out / removing the arch rib B12 which is the main girder, so that carrying out / removing becomes easy.

（２）仮支持部材設置工程
次に、図４、図５に示すように、次工程の回転ヒンジ形成工程Ｓ３において、アーチリブＢ１２のアーチアバットＢ１０、Ｂ１１側となる両端付近に回転ヒンジを形成する際に、アーチリブＢ１２の自重を支える仮支持部材を設置する仮支持部材設置工程Ｓ２を行う。第１実施形態に係る跳ね上げ回転式橋の解体・撤去方法の仮支持部材設置工程Ｓ２では、仮支持部材として、コンクリート製の支持部材Ｃ１を設置する。 (2) Temporary Support Member Installation Step Next, as shown in FIGS. 4 and 5, in the next rotary hinge forming step S3, rotary hinges are formed near both ends of the arch rib B12 on the arch abutments B10 and B11 sides. At this time, a temporary support member installation step S2 for installing a temporary support member that supports the weight of the arch rib B12 is performed. In the temporary support member installation step S2 of the dismantling / removal method of the flip-up rotary bridge according to the first embodiment, a concrete support member C1 is installed as a temporary support member.

具体的には、アーチアバットＢ１０、Ｂ１１の一部のコンクリートを斫り取って、鉄筋を露出させたうえ、支持部材Ｃ１の型枠を建込み、コンクリートを打設してアーチアバットＢ１０、Ｂ１１と支持部材Ｃ１を一体化させる。勿論、ケミカルアンカー等の後施工アンカーでアーチアバットＢ１０、Ｂ１１とアーチリブＢ１２の両方に接続・固定された鋼製の支持部材であっても構わない。要するに、支持部材は、次工程の回転ヒンジ形成工程Ｓ３においてアーチリブＢ１２とアーチアバットＢ１０、Ｂ１１との接合部分を斫りとったり、アーチリブＢ１２の基端部を切断したりする際にアーチリブＢ１２の自重の一部（半分）を支えることができる部材であればよい（図７も参照）。   Specifically, a part of the concrete of the arch abuts B10 and B11 is scraped to expose the reinforcing bars, and the formwork of the support member C1 is erected, and the concrete is placed to place the arch abuts B10 and B11. The support member C1 is integrated. Of course, it may be a steel support member connected and fixed to both the arch abutments B10 and B11 and the arch rib B12 with a post-installed anchor such as a chemical anchor. In short, the support member rolls off the joint portion of the arch rib B12 and the arch abut B10, B11 in the next rotation hinge forming step S3, or cuts the base end of the arch rib B12 when the weight of the arch rib B12 is reduced. Any member can be used as long as it can support a part (half) (see also FIG. 7).

（３）回転ヒンジ形成工程
次に、図６に示すように、アーチリブＢ１２とアーチアバットＢ１０、Ｂ１１との接合部分のコンクリート等を斫り取って撤去し、主桁であるアーチリブＢ１２の跳ね上げ回転が可能な回転ヒンジを形成する回転ヒンジ形成工程Ｓ３を行う。第１実施形態に係る跳ね上げ回転式橋の解体・撤去方法の回転ヒンジ形成工程Ｓ３では、図７に示すように、回転ヒンジとして、アーチリブＢ１２とアーチアバットＢ１０、Ｂ１１との接合部分に橋梁の規模に応じて単数又は複数のピン支承機構Ｐ１を設置する。また、ピン支承機構Ｐ１を設置して回転ヒンジを形成するとともに、アーチリブＢ１２の回転に支障がないように、アーチアバットＢ１０、Ｂ１１の一部を斫り取って撤去する。 (3) Rotating Hinge Forming Step Next, as shown in FIG. 6, the concrete and the like at the joint portion between the arch rib B12 and the arch abut B10 and B11 are scraped off and removed, and the arch rib B12 that is the main girder is flipped up and rotated. Rotation hinge formation process S3 which forms the rotation hinge which can be performed is performed. In the rotary hinge forming step S3 of the dismantling / removal method of the flip-up rotary bridge according to the first embodiment, as shown in FIG. 7, as a rotary hinge, a bridge is formed at the joint between the arch rib B12 and the arch abut B10, B11. One or a plurality of pin support mechanisms P1 are installed according to the scale. Further, the pin support mechanism P1 is installed to form a rotating hinge, and part of the arch abutments B10 and B11 are scraped and removed so as not to hinder the rotation of the arch rib B12.

このピン支承機構Ｐ１は、図８に示すように、下沓Ｐ１０と上沓Ｐ１１とを水平方向に伸びるピンＰ１２で回動自在に連結した鋼製のピン支承機構であり、下沓Ｐ１０がアンカーＡ１０でアーチアバットＢ１０、Ｂ１１に定着され、上沓Ｐ１１がアンカーＡ１１でアーチリブＢ１２に定着されている。このため、ピン支承機構Ｐ１をアーチリブＢ１２とアーチアバットＢ１０、Ｂ１１との接合部分に設置することにより、アーチリブＢ１２がアーチアバットＢ１０、Ｂ１１に対して回動自在となる。   As shown in FIG. 8, this pin support mechanism P1 is a steel pin support mechanism in which a lower collar P10 and an upper collar P11 are rotatably connected by a pin P12 extending in a horizontal direction, and the lower collar P10 is an anchor. A10 is fixed to the arch abutments B10 and B11, and the upper collar P11 is fixed to the arch rib B12 by the anchor A11. For this reason, by installing the pin support mechanism P1 at the joint portion between the arch rib B12 and the arch abut B10, B11, the arch rib B12 can be rotated with respect to the arch abut B10, B11.

但し、この回転ヒンジ形成工程では、図８に示すようなピン支承機構Ｐ１を設置するのではなく、アーチリブＢ１２とアーチアバットＢ１０、Ｂ１１との接合部分のコンクリート等を斫り取り、内部補強鉄筋の一部を切断するなどして、アーチリブＢ１２とアーチアバットＢ１０、Ｂ１１との接合部分に強度的な弱点部分を形成し、そこを回転ヒンジとしてもよい。要するに、アーチリブＢ１２がアーチアバットＢ１０、Ｂ１１に対して回動自在となる回転ヒンジを形成できればよい。   However, in this rotary hinge formation process, the pin support mechanism P1 as shown in FIG. 8 is not installed, but the concrete or the like at the joint between the arch rib B12 and the arch abut B10, B11 is scraped off, and the internal reinforcing steel bar A strong weak point portion may be formed at a joint portion between the arch rib B12 and the arch abuts B10 and B11 by cutting a part or the like, and this may be used as a rotary hinge. In short, it suffices if the arch rib B12 can form a rotary hinge that can rotate with respect to the arch abuts B10 and B11.

勿論、例えば、鋼橋などアバット等とアーチリブ等とがピン接合で接合され、既に橋に回転ヒンジが形成されている場合は、前述の回転ヒンジ形成工程は省略することができるのは云うまでもない。   Of course, for example, when an abutment such as a steel bridge and an arch rib are joined by pin joining and a rotary hinge is already formed on the bridge, the above-mentioned rotary hinge forming step can be omitted. Absent.

（４）反力台設置工程
次に、図９に示すように、アーチリブＢ１２を引っ張って跳ね上げ回転させるための牽引用の線材及びその反力台を設置する反力台設置工程Ｓ４を行う。第１実施形態に係る跳ね上げ回転式橋の解体・撤去方法の反力台設置工程Ｓ４では、橋台Ｂ１５、Ｂ１６の上に、反力台Ｄ１をそれぞれ設置するとともに、アーチリブＢ１２牽引用の線材として、ＰＣ鋼線（ＰＣ鋼線より線、ＰＣ鋼棒を含む、以下同じ）Ｐ２を反力台Ｄ１とアーチリブＢ１２の頂部付近との間に張設する。また、反力台Ｄ１は、必要に応じて、ＰＣ鋼線Ｐ２と反対方向にグランドアンカーＧ１で控えをとって地盤から反力を得るようにしてもよい。※必要な反力を取れるのであれば反力台の設置位置は、橋台後方でも良い (4) Reaction force table installation step Next, as shown in FIG. 9, a reaction force table installation step S4 for installing the pulling wire for pulling and rotating the arch rib B12 and the reaction force table is performed. In the reaction platform installation step S4 of the dismantling / removal method of the flip-up rotary bridge according to the first embodiment, the reaction platform D1 is installed on each of the abutments B15 and B16, and the wire for arch rib B12 is pulled. PC steel wire (PC steel wire, including PC steel bar, the same applies hereinafter) P2 is stretched between the reaction table D1 and the vicinity of the top of the arch rib B12. In addition, the reaction force table D1 may obtain a reaction force from the ground by holding a ground with a ground anchor G1 in a direction opposite to the PC steel wire P2, if necessary. * If the necessary reaction force can be obtained, the reaction platform can be installed behind the abutment.

（５）桁切断工程
次に、図１０に示すように、アーチリブＢ１２を中央付近で切断する桁切断工程Ｓ５を行う。第１実施形態に係る跳ね上げ回転式橋の解体・撤去方法の桁切断工程Ｓ５では、フラットソーやワイヤーソー等の切断装置を用いて、又は溝状にコンクリートを斫り取って鉄筋をカッター等で切断することにより、アーチリブＢ１２を中央付近で２つのピースに切断する。このとき、前工程で張設したＰＣ鋼線Ｐ２に張力を付与してアーチリブＢ１２が切断時に下降しないようにすると安全上好ましい。 (5) Girder cutting step Next, as shown in FIG. 10, a girder cutting step S5 for cutting the arch rib B12 near the center is performed. In the girder cutting step S5 of the dismantling / removal method of the flip-up rotary bridge according to the first embodiment, a cutting device such as a flat saw or a wire saw is used, or concrete is scraped off into a groove shape to cut a reinforcing bar. The arch rib B12 is cut into two pieces in the vicinity of the center. At this time, it is preferable for safety to apply tension to the PC steel wire P2 stretched in the previous step so that the arch rib B12 does not descend during cutting.

（６）桁回転工程
次に、図１１に示すように、前工程で２つのピースに切断したアーチリブＢ１２をそれぞれ回転ヒンジであるピン支承機構Ｐ１を軸として上方へ跳ね上げて回転させ橋台Ｂ１５、Ｂ１６側へ引き寄せる桁回転工程Ｓ６を行う。第１実施形態に係る跳ね上げ回転式橋の解体・撤去方法の桁回転工程Ｓ６では、撤去せずに存置した鉛直材Ｂ１３及び補剛桁Ｂ１４と当接する直前となる所定角度まで、切断したアーチリブＢ１２を上方へ跳ね上げて回転させる。ここで、所定角度とは、ピン支承機構Ｐ１の軸であるピンＰ１２の直上に切断したアーチリブＢ１２のピースの重心が位置する角度であり、この角度であれば、アーチリブＢ１２の自重で回転するおそれが少なく好ましい。また、所定角度にアーチリブＢ１２を止めるのは、鉛直材Ｂ１３又は補剛桁Ｂ１４に緩衝材を噛まして当接させて止めるとよい。 (6) Girder Rotation Step Next, as shown in FIG. 11, the arch ribs B12 cut into two pieces in the previous step are rotated upward with the pin support mechanism P1 that is a rotation hinge as an axis, and rotated to the abutment B15. A girder rotation step S6 for drawing toward the B16 side is performed. In the girder rotation step S6 of the dismantling / removal method of the flip-up rotary bridge according to the first embodiment, the arch rib cut to a predetermined angle immediately before coming into contact with the vertical material B13 and the stiffening girder B14 that have not been removed. B12 is flipped up and rotated. Here, the predetermined angle is an angle at which the center of gravity of the piece of the arch rib B12 cut right above the pin P12 that is the axis of the pin support mechanism P1 is located. Is preferable. The arch rib B12 may be stopped at a predetermined angle by stopping the arch rib B12 by biting a buffer material against the vertical material B13 or the stiffening beam B14.

（７）桁解体・撤去工程
次に、図１２に示すように、前工程で上方へ跳ね上げたアーチリブＢ１２を解体・撤去する桁解体・撤去工程Ｓ７を行う。第１実施形態に係る跳ね上げ回転式橋の解体・撤去方法の桁解体・撤去工程Ｓ７では、跳ね上げたアーチリブＢ１２の脇に足場を組んで、アーチリブＢ１２を斫るか切断して，上方から下方へ徐々に解体していく。足場は、コンクリート製で足元の支持力が安定しているアーチアバットＢ１０、Ｂ１１上に組み立てるとよい。また、解体したアーチリブＢ１２のコンクリート片は、残置した補剛桁Ｂ１４上の道路Ｒ２などを利用して搬出・撤去する。勿論、場合によっては、交差する道路Ｒ１を利用してもよい。 (7) Girder disassembly / removal step Next, as shown in FIG. 12, a girder disassembly / removal step S7 for dismantling / removing the arch rib B12 that has been flipped upward in the previous step is performed. In the dismantling / removal step S7 of the dismantling / removal method of the flip-up rotary bridge according to the first embodiment, a scaffold is built on the side of the arch rib B12 that is flipped up, and the arch rib B12 is beaten or cut from above. Dismantle gradually downward. The scaffold may be assembled on arch abutments B10 and B11 made of concrete and having stable foot support. Further, the dismantled concrete piece of the arch rib B12 is carried out and removed by using the road R2 and the like on the remaining stiffening girder B14. Of course, in some cases, a crossing road R1 may be used.

（８）その他の残部解体・撤去工程
次に、図示しないが、従来の橋の解体・撤去方法と同様に、残りの鉛直材Ｂ１３及び補剛桁Ｂ１４、アーチアバットＢ１０、Ｂ１１、橋台Ｂ１５、Ｂ１６などの残部を解体・撤去する残部解体・撤去工程を行う。解体したコンクリート等のピースは、従来通り大型のクレーン等の揚重装置で、揚重・移動し、道路Ｒ２又は道路Ｒ１等を利用して搬出・撤去する。 (8) Other remaining part dismantling / removal process Next, although not shown, the remaining vertical members B13 and stiffening girders B14, arch abuts B10, B11, abutments B15, B16, as in the conventional dismantling / removing method of the bridge The remaining part dismantling / removal process is performed to dismantle / remove the remaining part. The piece of concrete or the like that has been demolished is lifted and moved by a lifting device such as a large crane as before, and is carried out and removed using the road R2 or the road R1.

以上に説明した本発明の第１実施形態に係る跳ね上げ回転式橋の解体・撤去方法によれば、足場や支保工の設置個所を極力少なくすることができるので、その分工期を短縮して解体・撤去作業のコストダウンを図ることができる。その上、跳ね上げるだけで、アーチリブＢ１２等の解体作業のしやすい場所で解体してすぐそばから解体したアーチリブＢ１２等のピースを搬出することができるため、作業時間を短縮して解体・撤去作業のコストダウンを図ることができる。   According to the dismantling / removal method of the flip-up rotary bridge according to the first embodiment of the present invention described above, the number of installation sites for scaffolding and support can be reduced as much as possible. Costs for dismantling and removal can be reduced. In addition, it is possible to carry out pieces such as the arch rib B12 that has been disassembled from a location that is easy to dismantle, such as the arch rib B12, by simply jumping up, and can be carried out immediately. Cost reduction.

また、第１実施形態に係る跳ね上げ回転式橋の解体・撤去方法によれば、桁切断工程Ｓ５前に、反力台設置工程Ｓ４を行うので、アーチリブＢ１２の切断の際に、アーチリブＢ１２が反力台Ｄ１とＰＣ鋼線Ｐ２で掛け止められており、アーチリブＢ１２が下降しない。そのため、切断時にアーチリブＢ１２が回動（移動）しないので、切断したアーチリブＢ１２の一部が誤って落下してしまう事故等を防ぐことができる。   Moreover, according to the dismantling / removal method of the flip-up rotary bridge according to the first embodiment, the reaction table mounting step S4 is performed before the girder cutting step S5. Therefore, when the arch rib B12 is cut, It is latched by the reaction force table D1 and the PC steel wire P2, and the arch rib B12 does not descend. Therefore, since the arch rib B12 does not rotate (move) during cutting, an accident in which a part of the cut arch rib B12 is accidentally dropped can be prevented.

その上、第１実施形態に係る跳ね上げ回転式橋の解体・撤去方法によれば、回転ヒンジ形成工程Ｓ３前に仮支持部材設置工程Ｓ２を行うので、回転ヒンジ形成工程Ｓ３において、アーチリブＢ１２にピン支承機構Ｐ１などの回転ヒンジを形成する際に、アーチリブＢ１２が自重で崩壊したり落下したりすることを防止することができる。   In addition, according to the dismantling / removal method of the flip-up rotary bridge according to the first embodiment, the temporary support member installation step S2 is performed before the rotation hinge formation step S3. Therefore, in the rotation hinge formation step S3, the arch rib B12 When forming a rotary hinge such as the pin support mechanism P1, it is possible to prevent the arch rib B12 from collapsing or falling due to its own weight.

［第２実施形態］
次に、図１３〜図１８を用いて、第１実施形態に係る跳ね上げ回転式橋の解体・撤去方法の変形例である第２実施形態に係る跳ね上げ回転式橋の解体・撤去方法について説明する。第２実施形態に係る跳ね上げ回転式橋の解体・撤去方法が、第１実施形態に係る跳ね上げ回転式橋の解体・撤去方法と相違する点は、仮支持部材設置工程Ｓ２を行わず、回転ヒンジ形成工程Ｓ２’を行った後にアーチリブＢ１２の基端部を切断してアーチアバットＢ１０、Ｂ１１から切り離す点であり、その点を中心に説明し、第１実施形態に係る跳ね上げ回転式橋の解体・撤去方法と同一工程は、説明を省略する。 [Second Embodiment]
Next, with reference to FIGS. 13 to 18, a method for dismantling / removing the flip-up rotary bridge according to the second embodiment, which is a modification of the method for dismantling / removing the flip-up rotary bridge according to the first embodiment. explain. The disassembly / removal method of the flip-up rotary bridge according to the second embodiment is different from the disassembly / removal method of the flip-up rotary bridge according to the first embodiment, without performing the temporary support member installation step S2. This is a point where the base end portion of the arch rib B12 is cut and separated from the arch abutments B10 and B11 after the rotary hinge forming step S2 ′ is performed, and this point will be mainly described, and the flip-up rotary bridge according to the first embodiment Description of the same steps as the dismantling / removal method is omitted.

図１３に示すように、第２実施形態に係る跳ね上げ回転式橋の解体・撤去方法は、補剛桁・鉛直材撤去工程Ｓ１と、回転ヒンジ形成工程Ｓ２’と、桁下端切断・撤去工程Ｓ３’と、反力台設置工程Ｓ４と、桁切断工程Ｓ５と、桁回転工程Ｓ６、桁解体・撤去工程Ｓ７など、の工程を備えたアーチ橋を解体・撤去する方法である。   As shown in FIG. 13, the dismantling / removal method of the flip-up rotary bridge according to the second embodiment includes a stiffening girder / vertical material removal step S1, a rotary hinge formation step S2 ′, and a girder lower end cutting / removal step. This is a method of dismantling / removing the arch bridge including the steps of S3 ′, reaction table setting step S4, girder cutting step S5, girder rotation step S6, girder disassembly / removal step S7, and the like.

（２）回転ヒンジ形成工程
前述と同様に（１）補剛桁・鉛直材撤去工程を行った後、図１４、図１５に示すように、アーチリブＢ１２とアーチアバットＢ１０、Ｂ１１との接合部分のアーチリブＢ１２の下に、アーチリブＢ１２の跳ね上げ回転が可能な回転ヒンジを形成する回転ヒンジ形成工程Ｓ２’を行う。第２実施形態に係る跳ね上げ回転式橋の解体・撤去方法の回転ヒンジ形成工程Ｓ２’では、回転ヒンジとして前述のピン支承機構Ｐ１を設置するが、前述の（３）回転ヒンジ形成工程のように、アーチリブＢ１２の下端を切断してその端面にピン支承機構Ｐ１を設置するのではなく、アーチリブＢ１２の下部（下端付近）の下側及びアーチアバットＢ１０、Ｂ１１にコンクリート部材Ｃ２を打ち増して、ピン支承機構Ｐ１を設置する。勿論、コンクリートを打ち増さず、全て鋼製としてもよいことは云うまでもない。 (2) Rotating hinge forming process (1) After performing the stiffening girder / vertical material removing process as described above, as shown in FIG. 14 and FIG. 15, the joint portion of the arch rib B12 and the arch abut B10, B11 Under the arch rib B12, a rotary hinge forming step S2 ′ is performed to form a rotary hinge that allows the arch rib B12 to be flipped up and rotated. In the rotary hinge forming step S2 ′ of the dismantling / removal method of the flip-up rotary bridge according to the second embodiment, the above-described pin support mechanism P1 is installed as a rotary hinge, but as in the above-mentioned (3) rotary hinge forming step. Rather than cutting the lower end of the arch rib B12 and installing the pin support mechanism P1 on its end face, the concrete member C2 is added to the lower part of the arch rib B12 (near the lower end) and to the arch abutments B10 and B11. The pin support mechanism P1 is installed. Of course, it is needless to say that the concrete may be made of steel without increasing the concrete.

なお、本工程では、図１６、図１７に示すように、ピン支承機構Ｐ１及びコンクリート部材Ｃ２をアーチリブＢ１２の下部（下端付近）の下側ではなく、上側に設けてもよい。但し、ピン支承機構Ｐ１を設置する際には、アーチリブＢ１２の回転に支障がないように、図に示すように、アーチアバットＢ１０、Ｂ１１の一部を斫り取って撤去する。   In this step, as shown in FIGS. 16 and 17, the pin support mechanism P1 and the concrete member C2 may be provided on the upper side instead of the lower side (near the lower end) of the arch rib B12. However, when installing the pin support mechanism P1, as shown in the figure, part of the arch abuts B10 and B11 is scraped off and removed so as not to hinder the rotation of the arch rib B12.

（３）桁下端切断・撤去工程
次に、図１８に示すように、アーチリブＢ１２とアーチアバットＢ１０、Ｂ１１との接合部分であるアーチリブＢ１２の下部を切断してアーチアバットＢ１０、Ｂ１１からアーチリブＢ１２を切り離す。また、このとき、アーチリブＢ１２の回転に支障がないように、アーチアバットＢ１０、Ｂ１１の一部を斫り取って撤去する。 (3) Girder lower end cutting / removing step Next, as shown in FIG. 18, the lower part of the arch rib B12, which is a joint portion between the arch rib B12 and the arch abut B10, B11, is cut to remove the arch rib B12 from the arch abut B10, B11. Separate. At this time, part of the arch abutments B10 and B11 is scraped off and removed so that the rotation of the arch rib B12 is not hindered.

第２実施形態に係る跳ね上げ回転式橋の解体・撤去方法では、以降の工程では、前述の（４）反力台設置工程〜（８）その他の残部解体・撤去工程を順次行っていく。   In the dismantling / removal method of the flip-up rotary bridge according to the second embodiment, in the subsequent steps, the above-described (4) reaction force table installation step to (8) other remaining dismantling / removal steps are sequentially performed.

第２実施形態に係る跳ね上げ回転式橋の解体・撤去方法によれば、（３）桁下端切断・撤去工程の前に、（２）回転ヒンジ形成工程を行っている、つまり、アーチアバットＢ１０、Ｂ１１からアーチリブＢ１２を切り離す際に、既にピン支承機構Ｐ１でアーチリブＢ１２とアーチアバットＢ１０、Ｂ１１とが連結されている。このため、ピン支承機構Ｐ１の設置作業を安全に行うことができ、アーチリブＢ１２が自重で崩壊したり落下したりすることを防止することができる。   According to the dismantling / removal method of the flip-up rotary bridge according to the second embodiment, (2) the rotating hinge forming step is performed before the girder lower end cutting / removing step, that is, the arch abut B10. When the arch rib B12 is separated from B11, the arch rib B12 and the arch abut B10, B11 are already connected by the pin support mechanism P1. For this reason, the installation work of the pin support mechanism P1 can be performed safely, and the arch rib B12 can be prevented from collapsing or falling due to its own weight.

［第３実施形態］
次に、図１９〜図３３を用いて、第３実施形態に係る跳ね上げ回転式橋の解体・撤去方法について説明する。第３実施形態に係る跳ね上げ回転式橋の解体・撤去方法は、本発明に係る跳ね上げ回転式橋の解体・撤去方法を、方杖ラーメン橋を解体・撤去する場合に適用したものであり、この方杖ラーメン橋Ｈ１は、道路Ｒ１の上に立体交差する道路Ｒ２としてかけられた鉄筋コンクリート製またはプレストレストコンクリート製の跨道橋である。 [Third Embodiment]
Next, a method for disassembling and removing the flip-up rotary bridge according to the third embodiment will be described with reference to FIGS. The dismantling / removal method of the flip-up rotary bridge according to the third embodiment is an application of the dismantling / removal method of the flip-up rotary bridge according to the present invention to dismantling / removing the cane ramen bridge. The cane ramen bridge H1 is an overpass bridge made of reinforced concrete or prestressed concrete hung as a road R2 that intersects the road R1.

先ず、解体前の方杖ラーメン橋Ｈ１の構成について、図１９を用いて、簡単に説明する。図示方杖ラーメン橋Ｈ１は、道路Ｒ１の法面に、左右一対のアバットＨ１０、Ｈ１１が形成され、これらのアバットＨ１０、Ｈ１１に連結・支承された方杖Ｈ１２、Ｈ１３に支えられて主桁Ｈ１４が道路Ｒ１の法面の上部に形成された左右一対の橋台Ｈ１５、Ｈ１６間に架け渡されている。また、この主桁Ｈ１４は、方杖Ｈ１２、Ｈ１３と橋台Ｈ１５、Ｈ１６との間の側径間Ｈ１７、１８と、方杖Ｈ１２と方杖Ｈ１３との間の中央径間Ｈ１９とに分けられる。そして、少なくとも、中央径間Ｈ１９と方杖Ｈ１２、Ｈ１３とは、コンクリートで一体化されている。   First, the configuration of the cane ramen bridge H1 before dismantling will be briefly described with reference to FIG. The illustrated cane ramen bridge H1 has a pair of left and right abutments H10 and H11 formed on the slope of the road R1, and is supported by the canes H12 and H13 connected to and supported by the abutments H10 and H11. Is bridged between a pair of left and right abutments H15, H16 formed at the upper part of the slope of the road R1. The main girder H14 is divided into side spans H17, 18 between the canes H12, H13 and the abutments H15, H16 and a center span H19 between the cane H12 and the cane H13. At least the central span H19 and the canes H12 and H13 are integrated with concrete.

図２０に示すように、第３実施形態に係る跳ね上げ回転式橋の解体・撤去方法は、桁側径間撤去工程Ｓ１”と、仮支持部材設置工程Ｓ２”と、回転ヒンジ形成工程Ｓ３”と、反力台設置工程Ｓ４”と、桁切断工程Ｓ５”と、桁回転工程Ｓ６”、桁解体・撤去工程Ｓ７”など、の工程を備えた方杖ラーメン橋を解体・撤去する方法である。   As shown in FIG. 20, the dismantling / removal method of the flip-up rotary bridge according to the third embodiment includes a girder-side span removal step S1 ", a temporary support member installation step S2", and a rotary hinge formation step S3 ". And disassembling / removing the cane ramen bridge having the steps of the reaction table setting step S4 ″, the girder cutting step S5 ″, the girder rotation step S6 ″, the girder disassembly / removal step S7 ″, etc. .

（１）桁側径間撤去工程
先ず、第３実施形態に係る跳ね上げ回転式橋の解体・撤去方法はでは、図２１に示すように、後述の桁回転工程Ｓ６”において桁を回転させるのに邪魔となる破線で示した部分の主桁Ｈ１４、即ち主桁Ｈ１４の側径間Ｈ１７、１８を解体して、方杖ラーメン橋Ｈ１に続く左右の道路Ｒ２等から搬出・撤去する桁側径間撤去工程Ｓ１”を行う。本工程は、従来の橋の解体・撤去方法と同様であり、詳細な説明は省略する。 (1) Girder side span removal step First, in the dismantling / removal method of the flip-up rotary bridge according to the third embodiment, as shown in FIG. 21, the girder is rotated in a later-described girder rotation step S6 ″. The main girder H14 of the portion indicated by the broken line that is in the way, that is, the girder side diameter that is disassembled from the side girder H17, 18 of the main girder H14 and carried out and removed from the left and right roads R2 etc. following the brace ramen bridge H1. An intermediate removal step S1 ″ is performed. This process is the same as the conventional method for dismantling / removing the bridge, and detailed description thereof is omitted.

（２）仮支持部材設置工程
次に、図２２、図２３に示すように、次工程の回転ヒンジ形成工程Ｓ３”において方杖Ｈ１２、Ｈ１３のアバットＨ１０、Ｈ１１との接合部分である方杖Ｈ１２、Ｈ１３の基端部分の下側に回転ヒンジを形成する際に、方杖Ｈ１２、Ｈ１３の自重を支える仮支持部材を設置する仮支持部材設置工程Ｓ２”を行う。第３実施形態に係る跳ね上げ回転式橋の解体・撤去方法の仮支持部材設置工程Ｓ２”では、仮支持部材として、コンクリート製の支持部材Ｃ３を設置する。 (2) Temporary Support Member Installation Step Next, as shown in FIG. 22 and FIG. 23, the cane H12 that is a joint portion of the cane H12, H13 with the abuts H10, H11 in the next rotation hinge forming step S3 ″. When the rotary hinge is formed on the lower side of the proximal end portion of H13, a temporary support member installation step S2 ″ for installing a temporary support member that supports the weights of the canes H12 and H13 is performed. In the temporary support member installation step S2 ″ of the dismantling / removal method of the flip-up rotary bridge according to the third embodiment, a concrete support member C3 is installed as a temporary support member.

具体的には、アバットＨ１０、Ｈ１１の一部のコンクリートを斫り取って、鉄筋を露出させたうえ、支持部材Ｃ３の型枠を建込み、コンクリートを打設してアバットＨ１０、Ｈ１１と支持部材Ｃ３を一体化させる。勿論、ケミカルアンカー等の後施工アンカーでアバットＨ１０、Ｈ１１と方杖Ｈ１２、Ｈ１３の両方に接続・固定された鋼製の支持部材であっても構わない。要するに、支持部材は、次工程の回転ヒンジ形成工程Ｓ３”において方杖Ｈ１２、Ｈ１３とアバットＨ１０、Ｈ１１との接合部分を斫りとったり、方杖Ｈ１２、Ｈ１３の基端部を切断したりする際に方杖Ｈ１２、Ｈ１３の自重を支えることができる部材であればよい（図２５も参照）。   Specifically, a part of the concrete of the abuts H10 and H11 is scraped off to expose the reinforcing bars, and the form of the support member C3 is built, and the concrete is placed and the abutments H10 and H11 and the support member are placed. C3 is integrated. Of course, it may be a steel support member connected and fixed to both the abutment H10, H11 and the cane H12, H13 with a post-installed anchor such as a chemical anchor. In short, the support member rolls the joint portion between the cane H12, H13 and the abutment H10, H11 or cuts the proximal end of the cane H12, H13 in the next rotary hinge forming step S3 ″. Any member can be used as long as it can support the weight of the canes H12 and H13 (see also FIG. 25).

（３）回転ヒンジ形成工程
次に、図２４、図２５に示すように、方杖Ｈ１２、Ｈ１３とアバットＨ１０、Ｈ１１との接合部分のコンクリート等を斫り取って撤去し、方杖Ｈ１２、Ｈ１３及び主桁Ｈ１４（中央径間Ｈ１９）の跳ね上げ回転が可能な回転ヒンジを形成する回転ヒンジ形成工程Ｓ３”を行う。第３実施形態に係る跳ね上げ回転式橋の解体・撤去方法の回転ヒンジ形成工程Ｓ３”では、図２４、図２５に示すように、回転ヒンジとして、方杖Ｈ１２、Ｈ１３とアバットＨ１０、Ｈ１１との接合部分に橋梁の規模に応じて前述の単数又は複数のピン支承機構Ｐ１を設置する。また、方杖Ｈ１２、Ｈ１３及び主桁Ｈ１４（中央径間Ｈ１９）の回転に支障がないように、アバットＨ１０、Ｈ１１の一部を斫り取って撤去する。勿論、前述のように、本工程では、ピン支承機構Ｐ１を設置する代わりに、方杖Ｈ１２、Ｈ１３及び主桁Ｈ１４がアバットＨ１０、Ｈ１１に対して回動自在となる回転ヒンジを形成できればよく、回転ヒンジが既に形成されている場合は、本工程を省略可能である。 (3) Rotating Hinge Forming Step Next, as shown in FIGS. 24 and 25, the concrete or the like at the joint between the cane H12, H13 and the abutment H10, H11 is scraped off and removed, and the cane H12, H13 is removed. And a rotary hinge forming step S3 "for forming a rotary hinge capable of rotating the main girder H14 (center span H19). The rotary hinge of the dismantling / removal method of the flip-up rotary bridge according to the third embodiment. In the forming step S3 ″, as shown in FIGS. 24 and 25, as the rotary hinge, the above-mentioned single or plural pin support mechanisms at the joint portions of the canes H12, H13 and the abutments H10, H11 according to the scale of the bridge Install P1. Further, part of the abuts H10 and H11 is scraped and removed so as not to hinder the rotation of the canes H12 and H13 and the main beam H14 (center span H19). Of course, as described above, in this step, instead of installing the pin support mechanism P1, it is only necessary to form a rotary hinge in which the canes H12, H13 and the main girder H14 are rotatable with respect to the abuts H10, H11. If the rotary hinge has already been formed, this step can be omitted.

（４）反力台設置工程
次に、図２６に示すように、方杖Ｈ１２、Ｈ１３及び主桁Ｈ１４（中央径間Ｈ１９）を引っ張って跳ね上げ回転させるための牽引用の線材及びその反力台を設置する反力台設置工程Ｓ４”を行う。第３実施形態に係る跳ね上げ回転式橋の解体・撤去方法の反力台設置工程Ｓ４”では、橋台Ｈ１５、Ｈ１６の上に、前述の反力台Ｄ１をそれぞれ設置するとともに、方杖Ｈ１２、Ｈ１３及び主桁Ｈ１４牽引用の線材として、ＰＣ鋼線からなる引寄せケーブルＰ３を反力台Ｄ１と中央径間Ｈ１９の両端付近との間に張設する。また、反力台Ｄ１は、必要に応じて、引寄せケーブルＰ３と反対方向に前述のグランドアンカーＧ１で控えをとって地盤から反力を得るようにしても良いし、必要な反力を取れるのであれば反力台の設置位置は、橋台後方でも良い。 (4) Reaction force table installation process Next, as shown in FIG. 26, the pulling wire rod for pulling and rotating the cane H12, H13 and the main girder H14 (center span H19) and the reaction force thereof. The reaction platform installation step S4 "for installing the platform is performed. In the reaction platform installation step S4" of the dismantling / removal method of the flip-up rotary bridge according to the third embodiment, the above-described abutment platform H15, H16, The reaction force table D1 is installed, and a pulling cable P3 made of PC steel wire is used between the reaction force table D1 and the vicinity of both ends of the central span H19 as wire rods for pulling the cane H12, H13 and the main girder H14. To stretch. Further, the reaction force table D1 may obtain a reaction force from the ground by taking a refrain from the ground anchor G1 in the opposite direction to the pulling cable P3, if necessary, and can take a necessary reaction force. In this case, the reaction platform may be installed at the rear of the abutment.

（５）桁切断工程
次に、図２７に示すように、主桁Ｈ１４の中央径間Ｈ１９を中央付近で切断する桁切断工程Ｓ５”を行う。第３実施形態に係る跳ね上げ回転式橋の解体・撤去方法の桁切断工程Ｓ５”では、フラットソーやワイヤーソー等の切断装置を用いて、又は溝状にコンクリートを斫り取って鉄筋をカッター等で切断することにより、中央径間Ｈ１９を中央付近で２つのピースに切断する。このとき、前工程で張設した引寄せケーブルＰ３に張力を付与して中央径間Ｈ１９が切断時に下降しないようにすると安全上好ましい。 (5) Girder cutting step Next, as shown in FIG. 27, a girder cutting step S5 "is performed in which the central span H19 of the main girder H14 is cut near the center. The flip-up rotary bridge according to the third embodiment In the girder cutting step S5 ″ of the dismantling / removal method, the center span H19 is obtained by using a cutting device such as a flat saw or a wire saw, or scraping the rebar with a cutter or the like by scraping concrete into a groove shape. Cut into two pieces near the center. At this time, it is preferable from the viewpoint of safety that tension is applied to the pulling cable P3 stretched in the previous step so that the central span H19 does not descend during cutting.

（６）桁回転工程
次に、図２８に示すように、前工程で２つのピースに切断した中央径間Ｈ１９及び方杖Ｈ１２、Ｈ１３をそれぞれ回転ヒンジであるピン支承機構Ｐ１を軸として上方へ跳ね上げて回転させ、橋台Ｈ１５、Ｈ１６側へ引き寄せる桁回転工程Ｓ６”を行う。第３実施形態に係る跳ね上げ回転式橋の解体・撤去方法の桁回転工程Ｓ６”では、切断した中央径間Ｈ１９及び方杖Ｈ１２、Ｈ１３を、それぞれのピースの重心がピン支承機構Ｐ１の軸であるピンＰ１２の直上に位置する角度まで上方へ跳ね上げて回転させる。 (6) Girder Rotation Step Next, as shown in FIG. 28, the center span H19 and the wands H12 and H13, which were cut into two pieces in the previous step, are moved upward about the pin support mechanism P1 that is a rotation hinge. The girder rotation process S6 "is performed by flipping up and rotating and pulling it toward the abutments H15, H16. In the girder rotation process S6" of the dismantling / removal method of the flip-up rotary bridge according to the third embodiment, H19 and the wands H12 and H13 are spun up and rotated to an angle at which the center of gravity of each piece is located immediately above the pin P12 that is the axis of the pin support mechanism P1.

回転させているピースの重心が、回転ヒンジの回転中心に達すると、図２９に示すように、引寄せケーブルＰ３を張設している反対側の反力台Ｄ１からＰＣ鋼線からなる控えケーブルＰ４を中央径間Ｈ１９の端部付近に緊結（連結）する。そして、この控えケーブルＰ４を反対側の反力台Ｄ１から送り出しながら、切断した中央径間Ｈ１９及び方杖Ｈ１２、Ｈ１３のピースを、自重により橋台Ｈ１５、Ｈ１６側へ転倒させる。勿論、反対側の反力台Ｄ１から控えケーブルＰ４を中央径間Ｈ１９に緊結（連結）するのは、桁回転工程Ｓ６”前、例えば、反力台設置工程Ｓ４”において、引寄せケーブルＰ３を張設する際に同時に行ってもよい。   When the center of gravity of the rotating piece reaches the center of rotation of the rotary hinge, as shown in FIG. 29, the holding cable made of PC steel wire from the reaction force table D1 on the opposite side where the pulling cable P3 is stretched. P4 is tightened (connected) near the end of the central span H19. And while sending out this reserve cable P4 from the reaction force table D1 on the opposite side, the cut pieces of the center span H19 and the cane H12, H13 are turned over to the abutments H15, H16 side by their own weight. Of course, the connecting cable P4 is fastened (coupled) from the opposite reaction force table D1 to the center span H19 before the girder rotation step S6 ", for example, in the reaction force table installation step S4" It may be performed at the same time as the tensioning.

また、反対側の反力台Ｄ１から控えケーブルＰ４を張設するのではなく、図３０に示すように、押引装置Ｔ１を設置し、この押引装置Ｔ１の台Ｔ２と中央径間Ｈ１９とを回転自在なピン接合で連結する鋼材からなる押し棒Ｔ３を用いて、自重により橋台Ｈ１５、Ｈ１６側へ転倒しようとする中央径間Ｈ１９及び方杖Ｈ１２、Ｈ１３のピースを押し棒Ｔ３で押しながら引寄せケーブルＰ３で橋台Ｈ１５、Ｈ１６側へ引き寄せても構わない。   Further, instead of stretching the cable P4 from the opposite reaction force table D1, as shown in FIG. 30, a push / pull device T1 is installed, and the table T2 of the push / pull device T1 and the center span H19 Using the push rod T3 made of steel that connects the two with a freely rotatable pin joint, while pushing the piece of the center span H19 and the cane H12, H13 about to fall to the abutments H15, H16 side by its own weight with the push rod T3 You may draw toward the abutment H15, H16 side with the drawing cable P3.

（７）桁解体・撤去工程
次に、図３１に示すように、前工程で橋台Ｈ１５、Ｈ１６側へ引き寄せた中央径間Ｈ１９及び方杖Ｈ１２、Ｈ１３のピースを解体・撤去する桁解体・撤去工程Ｓ７”を行う。第３実施形態に係る跳ね上げ回転式橋の解体・撤去方法の桁解体・撤去工程Ｓ７”では、橋台Ｈ１５、Ｈ１６上に足場を組んで、これらのピースを斫るか切断して，上方から下方へ徐々に解体していく。また、解体したこれらのピースのコンクリート片は、道路Ｒ２などを利用して搬出・撤去する。勿論、場合によっては、交差する道路Ｒ１を利用してもよい。 (7) Girder disassembly / removal step Next, as shown in FIG. 31, the girder disassembly / removal for dismantling / removing the pieces of the center span H19 and the cane H12, H13 that were drawn to the abutments H15, H16 in the previous step. Step S7 ″ is performed. In the dismantling / removal step S7 ″ of the dismantling / removal method of the flip-up rotary bridge according to the third embodiment, a scaffold is assembled on the abutments H15, H16, and these pieces are rolled. Cut and dismantle gradually from top to bottom. Moreover, the concrete pieces of these pieces that have been demolished are carried out and removed using the road R2 and the like. Of course, in some cases, a crossing road R1 may be used.

また、図３２、図３３に示すように、ピン支承機構Ｐ１と同様の回転機構Ｐ１”を中央径間Ｈ１９の半分のピースに設けて、中央径間Ｈ１９及び方杖Ｈ１２、Ｈ１３からなるピースから方杖Ｈ１２、Ｈ１３を切断し、中央径間Ｈ１９の半分のピースをさらに回転させて道路Ｒ２上に転倒させたうえ、これらのピースを解体・撤去してもよい。このように、回転機構Ｐ１”を設けてさらに中央径間Ｈ１９を傾倒させることにより、道路Ｒ１の法面や道路Ｒ２などの地面に桁の大きなピースが接することとなり、足場を組む必要もなく、しかも油圧クラッシャーなどの大型機械などを使って直接大きなピースを解体したり、揚重したりすることができ、解体・撤去作業がさらに容易になる。   Further, as shown in FIGS. 32 and 33, a rotation mechanism P1 ″ similar to the pin support mechanism P1 is provided in a half piece of the central span H19, and the piece comprising the central span H19 and the canes H12 and H13 is used. The cane H12, H13 may be cut, and the half piece of the center span H19 may be further rotated to fall on the road R2, and these pieces may be disassembled and removed. ”And further tilting the center span H19, a large piece of girders will come into contact with the slope of the road R1 and the ground such as the road R2, and there is no need to build a scaffold, and a large machine such as a hydraulic crusher. Can be used to directly dismantle or lift large pieces, making disassembly and removal easier.

（８）その他の残部解体・撤去工程
次に、図示しないが、従来の橋の解体・撤去方法と同様に、残りのアバットＨ１０、Ｈ１１、橋台Ｈ１５、Ｈ１６などの残部を解体・撤去する残部解体・撤去工程を行う。解体したコンクリート等のピースは、従来通り大型のクレーン等の揚重装置で、揚重・移動し、道路Ｒ２又は道路Ｒ１等を利用して搬出・撤去する。 (8) Other remaining part dismantling / removal process Next, although not shown in the drawing, the remaining part dismantling / removing, such as the remaining abutments H10, H11, abutments H15, H16, etc., is performed in the same manner as the conventional dismantling / removing method of the bridge. -Perform removal process. The piece of concrete or the like that has been demolished is lifted and moved by a lifting device such as a large crane as before, and is carried out and removed using the road R2 or the road R1.

なお、第２実施形態に係る跳ね上げ回転式橋の解体・撤去方法で述べたのと同様に、第３実施形態に係る跳ね上げ回転式橋の解体・撤去方法でも、仮支持部材設置工程Ｓ２”を行わず、方杖Ｈ１２、Ｈ１３とアバットＨ１０、Ｈ１１との接合部分において、方杖Ｈ１２、Ｈ１３の基端部の上側又は下側にピン支承機構Ｐ１を取り付けた後、方杖Ｈ１２、Ｈ１３の基端部を切断してアバットＨ１０、Ｈ１１から切り離すようにしてもよい。そのような工程にしても、同様の作用効果を奏することは明らかである。   In addition, as described in the dismantling / removal method of the flip-up rotary bridge according to the second embodiment, the temporary support member installation step S2 in the dismantling / removal method of the flip-up rotary bridge according to the third embodiment. ”And the pin support mechanism P1 is attached to the upper or lower side of the base end of the cane H12, H13 at the joint between the cane H12, H13 and the abutment H10, H11, and then the cane H12, H13 It is obvious that the same operation and effect can be obtained even in such a process.

以上に説明した本発明の第３実施形態に係る跳ね上げ回転式橋の解体・撤去方法によれば、足場や支保工の設置個所をほとんど無くすことができるので、その分工期を短縮して解体・撤去作業のコストダウンを図ることができる。その上、跳ね上げるだけで、中央径間Ｈ１９や方杖Ｈ１２、Ｈ１３等を、解体作業のしやすい場所で解体してすぐそばから解体したこれらのピースを搬出することができるため、作業時間を短縮して解体・撤去作業のコストダウンを図ることができる。   According to the dismantling / removal method of the flip-up rotary bridge according to the third embodiment of the present invention described above, the installation place of the scaffolding and the supporting work can be almost eliminated.・ The cost of removal work can be reduced. In addition, it is possible to carry out these pieces that have been disassembled from the immediate vicinity after disassembling the center span H19 and the cane H12, H13, etc., by simply flipping up, so work time can be reduced. It can be shortened to reduce the cost of dismantling / removal work.

また、第３実施形態に係る跳ね上げ回転式橋の解体・撤去方法によれば、桁切断工程Ｓ５”前に、反力台設置工程Ｓ４”を行うので、中央径間Ｈ１９の切断の際に、中央径間Ｈ１９が反力台Ｄ１と引寄せケーブルＰ３で掛け止められており、中央径間Ｈ１９が下降しない。そのため、切断時に中央径間Ｈ１９及び方杖Ｈ１２、Ｈ１３が回動（移動）しないので、切断した中央径間Ｈ１９の一部が誤って落下してしまう事故等を防ぐことができる。   Moreover, according to the dismantling / removal method of the flip-up rotary bridge according to the third embodiment, the reaction force table installation step S4 "is performed before the girder cutting step S5", so when the central span H19 is cut. The central span H19 is latched by the reaction force table D1 and the pulling cable P3, and the central span H19 does not descend. Therefore, since the central span H19 and the wands H12 and H13 do not rotate (move) during cutting, an accident or the like in which a part of the cut central span H19 is accidentally dropped can be prevented.

その上、第３実施形態に係る跳ね上げ回転式橋の解体・撤去方法によれば、回転ヒンジ形成工程Ｓ３”前に仮支持部材設置工程Ｓ２”を行うので、回転ヒンジ形成工程Ｓ３”において、方杖Ｈ１２、Ｈ１３にピン支承機構Ｐ１などの回転ヒンジを形成する際に、方杖Ｈ１２、Ｈ１３及び中央径間Ｈ１９が自重で崩壊したり落下したりすることを防止することができる。   Furthermore, according to the dismantling / removal method of the flip-up rotary bridge according to the third embodiment, the temporary support member installation step S2 ″ is performed before the rotation hinge formation step S3 ″. Therefore, in the rotation hinge formation step S3 ″, When the rotary hinges such as the pin support mechanism P1 are formed on the canes H12 and H13, the cane H12 and H13 and the center span H19 can be prevented from collapsing or dropping due to their own weight.

以上、本発明の第１実施形態〜第３実施形態に係る跳ね上げ回転式橋の解体・撤去方法について詳細に説明したが、前述した又は図示した実施形態は、いずれも本発明を実施するにあたって具体化した一実施形態を示したものに過ぎず、これらによって本発明の技術的範囲が限定的に解釈されてはならないものである。   As mentioned above, although the dismantling / removal method of the flip-up rotary bridge according to the first to third embodiments of the present invention has been described in detail, the above-described or illustrated embodiments are all in carrying out the present invention. These are merely specific embodiments, and the technical scope of the present invention should not be construed in a limited manner.

特に、橋としてアーチ橋や方杖ラーメン橋を例示したが、斜材付きπ型ラーメン橋など他の構造の橋であっても構わない。また、コンクリート製の橋だけでなく、鋼橋にも本発明を適用できるのは勿論である。要するに、橋に斜材等があり、回転ヒンジを設けることで上方に跳ね上げ回転して解体・撤去できる橋であれば、本発明を適用することができる。   In particular, an arch bridge and a cane ramen bridge are exemplified as the bridge, but a bridge having another structure such as a π-type ramen bridge with diagonal materials may be used. Of course, the present invention can be applied not only to a concrete bridge but also to a steel bridge. In short, the present invention can be applied to any bridge that has a diagonal member or the like and can be disassembled and removed by flipping upward by providing a rotary hinge.

Ｓ１ ：補剛桁・鉛直材撤去工程
Ｓ１” ：桁側径間撤去工程
Ｓ２、Ｓ２” ：仮支持部材設置工程
Ｓ３、Ｓ２’、Ｓ３” ：回転ヒンジ形成工程
Ｓ３’ ：桁下端切断・撤去工程
Ｓ４、Ｓ４” ：反力台設置工程
Ｓ５、Ｓ５” ：桁切断工程
Ｓ６、Ｓ６” ：桁回転工程
Ｓ７、Ｓ７” ：桁解体・撤去工程
Ｂ１ ：アーチ橋
Ｂ１０、Ｂ１１ ：アーチアバット
Ｂ１２ ：アーチリブ（主桁）
Ｂ１３ ：鉛直材
Ｂ１４ ：補剛桁
Ｂ１５、Ｂ１６ ：橋台
Ｈ１ ：方杖ラーメン橋
Ｈ１０、Ｈ１２ ：アバット
Ｈ１２、Ｈ１３ ：方杖
Ｈ１４ ：主桁
Ｈ１５、Ｈ１６ ：橋台
Ｈ１７、Ｈ１８ ：側径間（主桁）
Ｈ１９ ：中央径間（主桁）
Ｒ１、Ｒ２ ：道路
Ｃ１、Ｃ３ ：仮支持部材
Ｃ２ ：コンクリート部材
Ｐ１ ：ピン支承機構（回転ヒンジ）
Ｐ１” ：回転機構（回転ヒンジ）
Ｐ２ ：ＰＣ鋼線（線材）
Ｐ３ ：引寄せケーブル（ＰＣ鋼線：線材）
Ｐ４ ：控えケーブル（ＰＣ鋼線：線材）
Ｔ１ ：押引装置
Ｔ２ ：台
Ｔ３ ：押し棒 S1: Stiffening girder / vertical material removal step S1 ": Girder side span removal step S2, S2": Temporary support member installation step S3, S2 ', S3 ": Rotary hinge formation step S3': Girder lower end cutting / removal step S4, S4 ": Reaction table installation process S5, S5": Girder cutting process S6, S6 ": Girder rotation process S7, S7": Girder disassembly and removal process B1: Arch bridge B10, B11: Arch abut B12: Arch rib ( Main digit)
B13: Vertical material B14: Stiffening girder B15, B16: Abutment H1: Brace ramen bridge H10, H12: Abutment H12, H13: Brace H14: Main girder H15, H16: Abutment H17, H18: Side span (main girder) )
H19: Center span (main girder)
R1, R2: Roads C1, C3: Temporary support member C2: Concrete member P1: Pin support mechanism (rotating hinge)
P1 ": rotating mechanism (rotating hinge)
P2: PC steel wire (wire)
P3: Drawer cable (PC steel wire: Wire rod)
P4: Reservoir cable (PC steel wire: Wire rod)
T1: Pushing and pulling device T2: Stand T3: Push rod

Claims (5)

橋を解体して撤去する橋の解体・撤去方法であって、
前記橋の桁を切断する桁切断工程と、前記橋の橋脚下部又はアーチリブ下部の回転ヒンジを軸として前記桁を上方へ跳ね上げて回転させ橋台側へ引き寄せる桁回転工程と、を有し、
前記橋脚下部又はアーチリブに強度的な弱点部分を形成するか、又は、新たなピン支承機構を設置して前記桁を上方へ跳ね上げて回転させる回転ヒンジを形成する回転ヒンジ形成工程を有すること
を特徴とする跳ね上げ回転式橋の解体・撤去方法。 A method of dismantling and removing a bridge that dismantles and removes the bridge,
Possess the digits cutting step of cutting the digits of the bridge, and column rotation step to draw the bridge piers lower or Achiribu bottom of the rotating hinge is rotated flipped the digits upward an axis to abutment side, a,
Forming a rotating hinge forming step of forming a strong weak point portion in the lower part of the pier or the arch rib, or forming a rotating hinge for installing a new pin support mechanism and flipping the girder upward to rotate it; Dismantling / removal method of the characteristic flip-up rotary bridge. 前記桁切断工程前に、前記桁を引っ張って跳ね上げ回転させるための線材及びその反力台を設置する反力台設置工程を有すること
を特徴とする請求項１に記載の跳ね上げ回転式橋の解体・撤去方法。 2. The flip-up rotary bridge according to claim 1, further comprising a reaction force table installation step of installing a wire rod for pulling and rotating the beam and rotating the beam and a reaction force table before the beam cutting step. Dismantling and removal methods. 前記桁回転工程で桁を跳ね上げる方向とは逆の回転方向へ牽引する線材を前記桁に緊結する工程を有すること
を特徴とする請求項１又は２に記載の跳ね上げ回転式橋の解体・撤去方法。 The dismantling of the flip-up rotary bridge according to claim 1 or 2 , further comprising a step of tightening a wire rod that pulls in a direction opposite to the direction in which the beam is flipped up in the beam rotating step to the beam. Removal method. 前記桁回転工程で桁を跳ね上げる方向とは逆の回転方向へ押圧する支持装置を前記桁に取り付ける工程を有すること
を特徴とする請求項１又は２に記載の跳ね上げ回転式橋の解体・撤去方法。 The dismantling of the flip-up rotary bridge according to claim 1 or 2 , further comprising a step of attaching a supporting device that presses the beam in a direction opposite to the direction in which the beam is flipped up in the beam rotating step. Removal method. 前記回転ヒンジ形成工程前に、回転ヒンジを形成する時に前記桁の自重を支える仮支持部材を設置する仮支持部材設置工程を有すること
を特徴とする請求項１ないし４のいずれかに記載の跳ね上げ回転式橋の解体・撤去方法。 Before the rotating hinge forming step, splashing according to any one of claims 1 to 4 characterized by having a temporary support member installation step of installing a temporary support member for supporting the weight of the digit in forming a living hinge Dismantling / removal method of lifting rotary bridge.
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