JP4856484B2 - Fall bridge prevention device and its construction method - Google Patents

Fall bridge prevention device and its construction method Download PDF

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JP4856484B2
JP4856484B2 JP2006193245A JP2006193245A JP4856484B2 JP 4856484 B2 JP4856484 B2 JP 4856484B2 JP 2006193245 A JP2006193245 A JP 2006193245A JP 2006193245 A JP2006193245 A JP 2006193245A JP 4856484 B2 JP4856484 B2 JP 4856484B2
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bridge
finger
gap
expansion joint
width direction
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正敏 大倉
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本発明は、橋台や橋脚などの下部構造から橋桁や床版などの上部構造が落下しないように保持する落橋防止の技術に関する。   The present invention relates to a technique for preventing a falling bridge that holds an upper structure such as a bridge girder or a floor slab from falling from a lower structure such as an abutment or a pier.

平成7年兵庫県南部地震で見られたように、高速道路等の橋梁が地震で倒壊すると、付近一帯に甚大な被害をもたらしてしまう。そこで、橋梁の落橋防止構造が見直され、桁座(橋座)を拡幅したり、上部構造(橋桁や床版の単位で呼ぶものとする)どうしを連結するといった落橋防止策が提案されている。   As seen in the 1995 Hyogoken-Nanbu Earthquake, if a bridge such as a highway collapses due to an earthquake, it will cause enormous damage to the entire area. Therefore, the structure to prevent the falling of bridges has been reviewed, and measures to prevent the falling of bridges have been proposed, such as widening the girders (bridges) and connecting the upper structures (to be called units of bridge girders and floor slabs). .

桁座拡幅による落橋防止は、橋台や橋脚の桁座に対し、コンクリートを打ち継いで拡幅したり、鋼鉄製ブラケットをアンカーボルトで取り付けて拡幅する構造である。また、上部構造間連結による落橋防止は、橋桁や床版の端部において橋幅方向へ貫通孔を設け、これにワイヤ等を通して向かい合った上部構造間を連結したり、上部構造の端部側面にチェーン等をかけて向かい合った上部構造間を連結する構造であり、たとえば特許文献1の図13、図14(段落0048〜0052参照)に示されたような構造が知られている。
特開平10−159021号公報
The prevention of falling bridges by widening the girders is a structure in which concrete is widened to the abutments and pier girder, or widened by attaching steel brackets with anchor bolts. In addition, to prevent falling bridges by connecting the upper structures, through holes are provided in the bridge width direction at the ends of the bridge girders and floor slabs, connecting the upper structures facing each other through wires, etc. For example, a structure shown in FIGS. 13 and 14 of Patent Document 1 (see paragraphs 0048 to 0052) is known.
JP-A-10-159021

上記従来の落橋防止構造において、桁座拡幅方式の場合、拡幅した部分の上面と橋桁との間には支承分の間隙が存在し、橋桁が支承から外れたときにその間隙分落下する上部構造の衝撃荷重を、拡幅部分で全面的に支えきれるかどうかに不安が残る。また、上部構造間連結方式の場合は、ワイヤやチェーンに余裕を持たせてたるませた状態にしてあるので、やはり橋桁が支承から外れたときに衝撃荷重がかかることになり、これに耐えきれるかどうかに不安が残る。   In the conventional bridge-falling prevention structure, in the case of the girder widening method, there is a bearing gap between the upper surface of the widened portion and the bridge girder, and when the bridge girder is removed from the bearing, the upper structure falls by that gap. It remains uncertain whether the impact load can be fully supported by the widened part. In addition, in the case of the superstructure connection method, the wire and chain are slackened so that an impact load is applied when the bridge girder is detached from the support, and it can withstand this. I am still worried about whether or not.

さらに、いずれの落橋防止構造においても、下部構造や上部構造のコンクリートにアンカ用などに削孔する必要があるが、橋梁のコンクリート内部にある鉄筋位置が不確定なため、孔を開けてみたところ鉄筋があって開け直しになったり、孔を開けるためのコアードリル等で知らないうちに鉄筋を損傷してしまう可能性もあり、あまり具合が良くない。   In addition, in any bridge prevention structure, it is necessary to drill holes for anchors etc. in the concrete of the lower structure or the upper structure, but since the position of the reinforcing bar inside the concrete of the bridge is uncertain, I tried to make a hole There is a possibility that the rebar will be reopened, or the rebar may be damaged without knowing it with a core drill for drilling holes.

本発明はこのような技術背景に基づいたもので、橋脚や橋台、床版など重要部分に対する不確実な削孔が不要で、且ついっそう確実に落橋を防止できるような落橋防止装置とその落橋防止工法を提案するものである。   The present invention is based on such a technical background, and there is no need for uncertain drilling of important parts such as piers, abutments and floor slabs, and a falling bridge prevention device that can prevent a falling bridge more reliably and its prevention. The method of construction is proposed.

本発明に係る落橋防止装置は、橋幅方向の貫通孔をフィンガー部にもつフィンガージョイント型で、上部構造の継目に設置される伸縮継手と、その貫通孔内に遊挿状態で挿入されて橋幅方向へ差し渡された貫通棒体と、を含んで構成され、前記貫通棒体は、両端部を上部構造側方に係止させてあることを特徴とする。 Girder prevention equipment according to the present invention, the through-hole of the bridge width direction Finger joint type with the fingers, and the expansion joint installed in the seam of the superstructure, is inserted loosely inserted state into the through hole And a penetrating rod body extending in the bridge width direction, wherein the penetrating rod body has both ends locked to the side of the upper structure.

また、本発明に係る落橋防止工法は、橋幅方向の貫通孔をフィンガー部にもつフィンガージョイント型の伸縮継手における互いに噛み合ったフィンガー部間に緩衝材を入れる工程と、その貫通孔に遊挿状態で貫通パイプを挿入して橋幅方向へ配管する工程と、該配管後の伸縮継手におけるフィンガー部間を施工現場の条件に合わせた遊間状態に維持しつつ、当該伸縮継手を上部構造施工部位に配置すると共に該伸縮継手のアンカーを床版鉄筋に固定する工程と、該上部構造施工部位にコンクリートを打設する工程と、貫通パイプに貫通棒体を通した後、上部構造側方に突出した当該貫通棒体の両端部を係止させる工程と、を含んで構成されることを特徴とする。 Further, girder preventing construction method according to the present invention includes the steps of the through-hole of the bridge width between the fingers interdigitated in finger-joint type expansion joint with the fingers put cushioning material, into the through-hole loosely fitted The process of inserting the through pipe in the state and piping in the bridge width direction, and maintaining the space between the fingers in the expansion joint after the piping in an idle state according to the conditions of the construction site, And fixing the anchor of the expansion joint to the floor slab, placing the concrete on the superstructure construction site, passing the through-rod body through the through pipe, and projecting to the side of the superstructure And a step of locking both end portions of the through-rod body.

本発明によれば、互いに噛み合ったフィンガー部の貫通孔に差し渡した貫通棒体が、上部構造の継目に設置された伸縮継手の離反を防止する、すなわち、フィンガー部間が最大遊間を大きく超えて離れていかないように繋ぎ止める連結装置の役割を担うので、地震等による想定外の力が作用した場合に、その外力を上部構造どうしで分担しあい、お互いが相手を繋ぎ止めるよう働かせることができる。つまり、伸縮継手に、上部構造間連結機能をもたせることによって、落橋防止能力を向上させている。   According to the present invention, the penetrating rods passed through the through holes of the finger portions engaged with each other prevent separation of the expansion joint installed in the joint of the upper structure, that is, the finger portions greatly exceed the maximum clearance. Since it plays the role of a connecting device that keeps them away from each other, when an unexpected force due to an earthquake or the like is applied, the external force can be shared between the upper structures, and each other can be made to work together to hold the other. That is, the ability to prevent the falling bridge is improved by providing the expansion joint with a function of connecting the upper structures.

このように、伸縮継手に連結機能をもたせたことによって、ワイヤやチェーンによる上部構造間連結方式のような余裕(たるみ)が無用となり、たとえ一方の上部構造が支承から外れたとしても、他方の上部構造が伸縮継手の連結機能によりこれを支えて、支承から外れた上部構造が桁座まで急激に落下してしまわないように留めることができる。したがって、桁座に衝撃荷重が加わる可能性は、従来に比べ格段に低くなる。In this way, by providing the expansion joint with a connecting function, there is no need for a slack as in the connection method between the upper structures using wires or chains, and even if one of the upper structures is removed from the support, The superstructure is supported by the connecting function of the expansion joint, so that the superstructure that is detached from the bearing can be prevented from dropping suddenly to the beam seat. Therefore, the possibility that an impact load is applied to the girders is much lower than in the past.

また、本発明によれば、新築橋梁であれば、その上部構造継目の継手施工段階で落橋防止装置も一緒に設置することができるし、既存橋梁の場合は、その上部構造継目の継手交換段階で落橋防止装置を組み込むことができる。継手の交換工事で施工可能なので、橋脚や橋台、あるいは床版に対する削孔は不要で、知らない間に鉄筋を傷つけるような心配は排除される。In addition, according to the present invention, if it is a newly built bridge, the fall bridge prevention device can be installed together at the joint construction stage of the superstructure joint. In the case of an existing bridge, the joint replacement stage of the superstructure joint is also possible. It is possible to incorporate a falling bridge prevention device. Since it can be constructed by joint replacement work, there is no need to drill holes in piers, abutments, or floor slabs, and the worry of damaging reinforcing bars without knowing it is eliminated.

図1に、本発明を適用する橋梁について、一つの例(道路橋)を概略的に示している。   FIG. 1 schematically shows an example (road bridge) of a bridge to which the present invention is applied.

下部構造の要素である橋台1及び橋脚2の桁座1a,2aに支承1b,2bが設置されており、この支承1b,2bに支えられて、複数の上部構造3が橋台1及び橋脚2の上に架け渡されている。そして、これら上部構造3の継目に、伸縮継手10が設置されている。伸縮継手10は、橋台1上では路盤Rと上部構造3との間、橋脚2上では上部構造3どうしの間を遊間をもって継ぐもので、フィンガーを交互に噛み合わせて組んだ一組のフィンガージョイント型のものが使用されている。本実施形態の落橋防止装置は、この伸縮継手10を含んで構成されており、その詳細について平面概略を図2に示してある。   Supports 1b and 2b are installed on girders 1a and 2a of the abutment 1 and the pier 2 which are elements of the substructure, and a plurality of superstructures 3 are supported by the supports 1b and 2b. It is stretched over. And the expansion joint 10 is installed in the joint of these upper structures 3. FIG. The expansion joint 10 is a pair of finger joints that are formed by interlinking the fingers alternately between the roadbed R and the upper structure 3 on the abutment 1 and between the upper structures 3 on the pier 2. The type is used. The falling bridge prevention device of the present embodiment is configured to include the expansion joint 10, and a plan outline of the details is shown in FIG. 2.

本実施形態に係る落橋防止装置は、上部構造3の継目(床版4、路盤Rの端部)に設置されたフィンガージョイント型の伸縮継手10において互いに噛み合うフィンガー部11に、橋幅方向の貫通孔12(図4等参照)を設け、該貫通孔12内に、貫通棒体13を遊挿状態で挿入して橋幅方向へ差し渡すことで、基本的に構成されている。本実施形態における貫通棒体13は、両端部14がボルト状に形成され、該両端部14が上部構造3の地覆5から側方へ突出する長さをもっており、この両端部14にナット15を螺合させることで、上部構造3の側方に係止させてある。本実施形態の場合、ナット15は、パッキンとなる樹脂プレート16及び角ワッシャ17を地覆5との間に介在させて締め付けるようにしている。   The fallen bridge prevention device according to the present embodiment penetrates the finger portions 11 that mesh with each other in the finger joint type expansion joint 10 installed at the joint of the upper structure 3 (the floor slab 4, the end of the roadbed R) in the bridge width direction. A hole 12 (see FIG. 4 and the like) is provided, and the through rod 12 is inserted into the through hole 12 in a loosely inserted state and passed in the bridge width direction. The penetrating rod body 13 in this embodiment has both end portions 14 formed in a bolt shape, and the both end portions 14 have a length protruding sideways from the ground cover 5 of the upper structure 3. Are engaged with the side of the upper structure 3. In the case of the present embodiment, the nut 15 is tightened with a resin plate 16 and a square washer 17 serving as packing interposed between the nut 15 and the ground cover 5.

このような落橋防止装置の工法について、図3〜図13を参照して説明する。   The construction method of such a fall-bridge prevention apparatus is demonstrated with reference to FIGS.

まず、図3に示すように伸縮継手10は、鋼鉄製のプレート18の裏面に鉄筋のアンカー19を溶接し、そして、該プレート18の表面に、フィンガーとして断面“コ”字状の鋼材を溶接することで、フィンガー部11を形成してある。プレート18にはI型鋼材やH型鋼材を利用することができるし、各フィンガー用材には角パイプ型鋼材やC型鋼材、あるいは溝型鋼材、L型鋼材を利用することができる。   First, as shown in FIG. 3, the expansion joint 10 welds a reinforcing bar anchor 19 to the back surface of a steel plate 18, and welds a steel material having a U-shaped cross section as a finger to the surface of the plate 18. By doing so, the finger part 11 is formed. An I-type steel material or an H-type steel material can be used for the plate 18, and a square pipe-type steel material, a C-type steel material, a groove-type steel material, or an L-type steel material can be used for each finger material.

このように形成したフィンガー部11を互いに噛み合わせることで伸縮継手10が組み上げられる(図4)。すると、フィンガー部11が断面“コ”字状で中空なので、一連のフィンガー部11内には、橋幅方向へ貫通した貫通孔12が形成されることになる。このように組み上がった伸縮継手10を天地返しにし、その互いに噛み合ったフィンガー部11の間に、緩衝材を入れる工程を実施する。   The expansion joint 10 is assembled by engaging the finger portions 11 formed in this way (FIG. 4). Then, since the finger portion 11 is hollow with a “U” cross section, a through hole 12 penetrating in the bridge width direction is formed in the series of finger portions 11. The expansion joint 10 assembled in this manner is turned upside down, and a cushioning material is inserted between the finger portions 11 engaged with each other.

この緩衝材を入れる工程においては、まず、噛み合っているフィンガー部11の間を最大遊間状態として、当該フィンガー部11間の谷部分間隙20に緩衝材を入れる工程を実施する(図5)。最大遊間は、橋梁の設置環境において想定される最低気温での継目間隔であり、本実施形態においては、貫通孔12のサイズも考慮して計算される。緩衝材を入れる際には、まず、天地返しにしてある伸縮継手10の谷部分間隙20の底に0.5〜4.0mm厚の樹脂シート21を敷き、そして、その上にシール剤22を10〜30mm厚まで流し込んで硬化させる。当該シール剤22は、硬化後も粘着性のある低弾性のものを選択するのがよい。継いで、シール剤22を形成した上に、低弾性のスポンジ等の発泡材23を充填する。この発泡材23は、図6に示すように、切り込みを入れるか、あるいは一部を貼り合わせる等でスリット24を形成しておくと好ましく、遊間が想定以上に広くなった場合の応力緩和につなげることができる。   In the step of putting the cushioning material, first, the step of putting the cushioning material in the valley portion gap 20 between the finger portions 11 is carried out with the gap between the engaging finger portions 11 being set to the maximum free play state (FIG. 5). The maximum clearance is the joint interval at the lowest temperature assumed in the installation environment of the bridge, and is calculated in consideration of the size of the through hole 12 in this embodiment. When putting the cushioning material, first, a resin sheet 21 having a thickness of 0.5 to 4.0 mm is laid on the bottom of the valley portion gap 20 of the expansion joint 10 that is turned upside down, and the sealing agent 22 is placed thereon. Pour to 10-30 mm thickness to cure. As the sealing agent 22, it is preferable to select a low-elasticity material that is sticky even after curing. In succession, the sealing agent 22 is formed, and then a foam material 23 such as a low elasticity sponge is filled. As shown in FIG. 6, it is preferable that the foam material 23 is formed with slits 24 by cutting or pasting a part thereof, which leads to stress relaxation when the gap becomes wider than expected. be able to.

このようにして樹脂シート21、シール剤22、発泡材23からなる緩衝材を谷部分間隙20に入れた後、当該伸縮継手10のフィンガー部11の間を今度は最小遊間状態として、フィンガー部11間の残りの部分の間隙20’(フィンガー側方)に緩衝材を入れる工程を実施する(図7)。最小遊間は、橋梁の設置環境において想定される最高気温での継目間隔である。この緩衝材工程も上記図5の工程と同様にして実施し、同じく樹脂シート25、シール剤26、発泡材27からなる緩衝材を形成する。そして、緩衝材を入れ終わったところで、貫通孔12に、貫通パイプ28を挿入して遊挿状態で橋幅方向へ配管する。該貫通パイプ28は、伸縮継手10の橋幅方向の長さ、つまり一方の地覆5から他方の地覆5までの橋幅にほぼ等しい。   Thus, after putting the buffer material which consists of the resin sheet 21, the sealing agent 22, and the foaming material 23 in the trough part gap | interval 20, between the finger parts 11 of the said expansion joint 10 is made into the minimum gap state this time, the finger parts 11 A step of putting a cushioning material into the gap 20 '(finger side) of the remaining portion is performed (FIG. 7). The minimum clearance is the seam interval at the highest temperature assumed in the bridge installation environment. The buffer material process is also performed in the same manner as the process of FIG. 5, and a buffer material composed of the resin sheet 25, the sealing agent 26, and the foam material 27 is formed. Then, when the buffer material has been inserted, the through pipe 28 is inserted into the through hole 12 and piped in the bridge width direction in the loosely inserted state. The through pipe 28 is substantially equal to the length of the expansion joint 10 in the bridge width direction, that is, the bridge width from one ground cover 5 to the other ground cover 5.

これによりフィンガー部11間の間隙全域に緩衝材が入ると、フィンガー部11間の間隔を平均気温の場合の遊間状態とし、そして図8に示すように、天地返しにしてある伸縮継手10の上面(すなわち設置時の下面)に、ゴム製又は軟質のプラスチック製の遮水シート29を接着するか、あるいはワッシャ&ビス30にて固定し、蓋をする。   As a result, when the cushioning material enters the entire gap between the finger portions 11, the space between the finger portions 11 is set to the loose state in the case of the average temperature, and as shown in FIG. 8, the upper surface of the expansion joint 10 turned upside down. A rubber or soft plastic water-impervious sheet 29 is adhered to (that is, the lower surface at the time of installation) or fixed with a washer & screw 30 and covered.

継いで伸縮継手10の天地を戻し、橋梁設置現場における施工時の気温に合わせた遊間状態に、アングルバー31などの点溶接で仮固定する(図9)。伸縮継手10の橋幅方向の長さは地覆5の外側面間の長さとし、横締めのゴムパッキンにて防水するとよい。また、目地はシール剤充填処理とする。これにて施工準備は整う。   Next, the expansion joint 10 is returned to the top and bottom, and temporarily fixed by spot welding of the angle bar 31 or the like in a loose state in accordance with the temperature at the time of construction at the bridge installation site (FIG. 9). The length of the expansion joint 10 in the bridge width direction is set to the length between the outer surfaces of the ground cover 5 and is preferably waterproofed by a laterally tightened rubber packing. The joint is filled with a sealant. Preparation for construction is now complete.

このフィンガー部11間を施工現場の条件に合わせた遊間状態に維持した配管後の伸縮継手10を用いて、上部構造3の施工部位に配置すると共にそのアンカー19を床版鉄筋7に溶接等で固定する工程を実施する(図10)。その上部構造3の施工部位は、既存橋梁の継手を交換する工事であれば、その既存継手を撤去した跡である。   Using the expansion joint 10 after piping maintained between the finger portions 11 in a loose state matching the conditions of the construction site, the anchor 19 is placed on the floor slab 7 by welding, etc. A fixing step is performed (FIG. 10). The construction site of the superstructure 3 is a trace of removing the existing joint if the construction is to replace the joint of the existing bridge.

続いて、当該伸縮継手10を配置した上部構造3の施工部位に、コンクリートを打設して路面レベルに仕上げ、また、地覆5及び高欄6を再現し、養生させる。養生後、貫通パイプ28に貫通棒体13を通し、上部構造3側方に突出した当該貫通棒体13の両端部14を係止させ、ズレ止め処理する。   Subsequently, concrete is placed on the construction site of the superstructure 3 in which the expansion joint 10 is disposed to finish the road surface level, and the ground cover 5 and the rail 6 are reproduced and cured. After curing, the penetrating rod body 13 is passed through the penetrating pipe 28, and both end portions 14 of the penetrating rod body 13 protruding to the side of the upper structure 3 are latched to prevent slippage.

貫通棒体13は、一本の鋼鉄棒又は高せん断力をもつ棒からなるものとしてもよいが、施工性を考えると、両端をねじ切りした短い鋼鉄棒又は高せん断力棒13aを多数用意し、これを機械式継手13bで連結しながら貫通パイプ28に挿入していく工法の方が適している(図11)。貫通棒体13は、上部構造3の側面(地覆5)から両端部14が突出する長さとし、該突出端部14に、角形の樹脂パッキン16を角形ワッシャ17及びナット15にて取り付ける(図12及び図13)。ナット15は強固に締め付け過ぎないようトルクを調整し、遊間変化の妨げにならないように注意する。また、斜橋の場合は、パッキン16の形状を角度に合わせた形状として、ワッシャ17及びナット15の収まりを調整する。なお、地覆目地は防水シールを施す。   The penetrating bar 13 may be composed of a single steel bar or a bar having a high shearing force. However, in consideration of workability, a large number of short steel bars or high shearing bar 13a threaded at both ends are prepared, The method of inserting this into the penetration pipe 28, connecting with the mechanical coupling 13b, is more suitable (FIG. 11). The penetrating bar 13 has such a length that both end portions 14 project from the side surface (ground cover 5) of the upper structure 3, and a square resin packing 16 is attached to the projecting end portion 14 with a square washer 17 and a nut 15 (see FIG. 12 and FIG. 13). Adjust the torque so that the nut 15 is not tightened too tightly, and be careful not to disturb the change in play. In addition, in the case of a sloping bridge, the fit of the washer 17 and the nut 15 is adjusted by changing the shape of the packing 16 to a shape matching the angle. In addition, the ground cover joint is provided with a waterproof seal.

以上の伸縮継手連結構造による落橋防止装置/工法の他、上部構造3の下方において補助的に上部構造3を支える副次的支持機構を設けることができる。その例を次に示す。   In addition to the above-described fallen bridge prevention device / construction method using the expansion joint connection structure, a secondary support mechanism for supporting the upper structure 3 in an auxiliary manner below the upper structure 3 can be provided. An example is shown below.

まず、橋脚2に対し設ける橋脚部副支持機構は、図14及び図15に示すように、橋脚2の桁座2a上に橋軸方向へ差し渡された連結体40と、該連結体40の両端部に固定されることで、桁座2aの橋軸方向両側方に配置され、支承2bに支持されている橋桁8の下面へ当接する当接体41と、を含んで構成される。本例の当接体41は、連結体40から下方へ延びた下方延長部42を有し、該下方延長部42が橋脚2の側面に当接するようにしてある。このように下方延長部42を有することにより、当接体41で橋脚2を挟み込んで固定する状態を得られ、具合がよい。また、下方延長部42が橋脚2に当接していることにより、支承2bから外れた上部構造3の荷重を受けたときに、下方延長部42から橋脚2の側面へ荷重を分担支持させられるので、連結体40の湾曲を防止する機能ももたせられる。   First, as shown in FIGS. 14 and 15, the pier sub-support mechanism provided for the pier 2 includes a connecting body 40 that extends in the direction of the bridge axis on the girder 2 a of the pier 2, and It is comprised including the contact body 41 which contact | abuts to the lower surface of the bridge girder 8 which is arrange | positioned at the both sides of the bridge axis direction of the girder 2a by being fixed to both ends, and is supported by the support 2b. The contact body 41 of this example has a downward extension 42 extending downward from the connecting body 40, and the downward extension 42 is in contact with the side surface of the pier 2. Thus, by having the downward extension part 42, the state which pinched | interposed and fixed the bridge pier 2 with the contact body 41 can be obtained, and the condition is good. Further, since the lower extension 42 is in contact with the pier 2, the load can be shared and supported from the lower extension 42 to the side surface of the pier 2 when receiving the load of the upper structure 3 removed from the support 2 b. The function of preventing the connecting body 40 from bending is also provided.

このような橋脚部副支持機構の施工法は、まず、橋桁8に当接するリブを有し、連結体40を通すための連結孔を設けたブラケットからなる当接体41を、樹脂パッキン43を介して桁座2aの橋軸方向両側方に仮留めする。このとき、当接体41と橋桁8の下面との間に樹脂パッキン44を介在させるとよい。そして、桁座2a上において、仮留めした当接体41の連結孔部位に、橋軸方向へ挿通パイプ45を差し渡す。この挿通パイプ45は、鋼鉄製又はプラスチック製とすることができる。続いて、当接体41の連結孔を通して挿通パイプ45に、鋼鉄製又は高張力材の連結体40を挿入し、該挿入した連結体40と挿通パイプ45との隙間にエポキシ樹脂やポリマーセメントなどの充填剤を防錆用に注入する。そして、支承2bに支持されている橋桁8の下面に樹脂パッキン44を介して当接体41を当接させつつ、連結体40の突出した両端部についてワッシャ46及びナット47にて固定する。   The construction method of such a bridge pier sub-supporting mechanism is as follows. First, a contact body 41 having a rib having a contact with the bridge girder 8 and provided with a connection hole for allowing the connection body 40 to pass through is attached to the resin packing 43. And temporarily fastened to both sides of the bridge axis direction of the girders 2a. At this time, the resin packing 44 may be interposed between the contact body 41 and the lower surface of the bridge beam 8. And on the girder 2a, the insertion pipe 45 is handed over to the connection hole site | part of the contact body 41 temporarily fastened in the bridge axis direction. The insertion pipe 45 can be made of steel or plastic. Subsequently, a connecting body 40 made of steel or high-tensile material is inserted into the insertion pipe 45 through the connection hole of the contact body 41, and epoxy resin, polymer cement, or the like is inserted into the gap between the inserted connection body 40 and the insertion pipe 45. The filler is injected for rust prevention. And the both ends which the connection body 40 protruded are fixed with the washer 46 and the nut 47, contacting the contact body 41 via the resin packing 44 to the lower surface of the bridge girder 8 supported by the support 2b.

これにより、伸縮継手10の連結機能に加えて上部構造3を下から支え、より確実に落橋を防止する落橋防止装置とその工法が提供される。   Thereby, in addition to the connection function of the expansion joint 10, the upper bridge 3 is supported from the bottom, and the fall prevention apparatus and its construction method for preventing the fall bridge more reliably are provided.

橋脚部分だけではなく、橋台1に対しても、上部構造3を副次的に支える橋台部副支持機構を設けることが可能である。その例について図16に示している。   It is possible to provide not only the pier part but also the abutment 1 with an abutment part auxiliary support mechanism that supports the upper structure 3 as a secondary. An example of this is shown in FIG.

橋台2に対し設ける橋台部副支持機構は、橋台1の桁座1a上に橋軸方向へ差し渡されると共にパラペット1cを貫通させて路盤R側に係止させた片持ち体50と、該片持ち体50の端部に固定されることで、桁座1aの橋軸方向側方に配置され、支承1bに支持されている橋桁8の下面へ当接する当接体51と、を含んで構成される。本例の当接体51は、片持ち体50から下方へ延びた下方延長部52を有し、該下方延長部52が橋台1の側面に当接するようにしてある。該下方延長部52の機能は、上記の下方延長部42と同じものである。   The abutment part auxiliary support mechanism provided for the abutment 2 is a cantilever 50 that is passed in the direction of the bridge axis on the beam 1a of the abutment 1 and penetrates the parapet 1c and is locked to the roadbed R side. And a contact body 51 that is fixed to the end portion of the holding body 50 so as to be disposed on the side of the bridge 1 in the bridge axial direction and that contacts the lower surface of the bridge 8 supported by the support 1b. Is done. The contact body 51 of this example has a downward extension 52 extending downward from the cantilever 50, and the downward extension 52 contacts the side surface of the abutment 1. The function of the lower extension 52 is the same as that of the lower extension 42 described above.

このような橋台部副支持機構の施工法は、まず、桁座1a上に橋軸方向へ挿通パイプ53を差し渡すと共にパラペット1cを貫通させる。このとき、パラペット1c反対側の路盤Rは、必要箇所をはつっておく。挿通パイプ53は、鋼鉄製又はプラスチック製とすることができる。そして、橋桁8に当接するリブを有し、片持ち体50を通すための連結孔を設けたブラケットからなる当接体51を、樹脂パッキン54を介して桁座1aの橋軸方向側方に仮留めする。この際には、当接体51と橋桁8の下面との間に樹脂パッキン55を介在させておく。また、当接体51は、挿通パイプ53と連結孔とが連通するように位置決めする。続いて、当接体51の連結孔を通して挿通パイプ53に、鋼鉄製又は高張力材の片持ち体50を挿入し、該挿入した片持ち体50と挿通パイプ53との隙間にエポキシ樹脂やポリマーセメントなどの充填剤を防錆用に注入する。そして、支承1bに支持されている橋桁8の下面に樹脂パッキン55を介して当接体51を当接させつつ、片持ち体50の突出した端部についてワッシャ56及びナット57にて固定する。一方、片持ち体50の他方の端部、すなわちパラペット1cの路盤R側に突出した端部は、ワッシャ58及びナット59にてパラペット1cに係止させる。   In the construction method of such an abutment part sub-support mechanism, first, the insertion pipe 53 is passed in the bridge axis direction on the beam 1a and the parapet 1c is penetrated. At this time, the roadbed R on the opposite side of the parapet 1c holds a necessary portion. The insertion pipe 53 can be made of steel or plastic. And the contact body 51 which consists of a bracket which has the rib contact | abutted to the bridge girder 8 and provided the connection hole for letting the cantilever 50 pass through the bridge axial direction side of the girder 1a through the resin packing 54 Temporarily fasten. At this time, the resin packing 55 is interposed between the contact body 51 and the lower surface of the bridge beam 8. The contact body 51 is positioned so that the insertion pipe 53 and the connection hole communicate with each other. Subsequently, a steel or high-tensile material cantilever 50 is inserted into the insertion pipe 53 through the connection hole of the contact body 51, and an epoxy resin or polymer is inserted into the gap between the inserted cantilever 50 and the insertion pipe 53. Inject a filler such as cement for rust prevention. Then, the projecting end of the cantilever 50 is fixed with a washer 56 and a nut 57 while the abutment body 51 is brought into contact with the lower surface of the bridge girder 8 supported by the support 1 b via the resin packing 55. On the other hand, the other end of the cantilever 50, that is, the end protruding to the roadbed R side of the parapet 1c is engaged with the parapet 1c by a washer 58 and a nut 59.

これにより、伸縮継手10の連結機能に加えて上部構造3を下から支え、より確実に落橋を防止する落橋防止装置とその工法が提供される。はつった路盤Rは、施工後に再現する。   Thereby, in addition to the connection function of the expansion joint 10, the upper bridge 3 is supported from the bottom, and the fall prevention apparatus and its construction method for preventing the fall bridge more reliably are provided. The closed roadbed R is reproduced after construction.

落橋に対する耐性をさらに向上させるために、上部構造3の下側にさらなる補助支持機構を設置することも可能である。これについて、図17〜図19に示している。   In order to further improve the resistance against the falling bridge, it is possible to install a further auxiliary support mechanism below the upper structure 3. This is illustrated in FIGS.

この例の補助支持機構は、上部構造3の下側を橋軸方向へ這うように、一方の橋台1と他方の橋台1との間に架設された2以上の高張力棒60と、上部構造3の下側を橋幅方向へ這うように、高張力棒60に架け渡された1以上の交差棒61と、を含んで構成されている。本例の高張力棒60は、機械式継手62にて継ぎ足して形成してあり、その両端部をパラペット1cに貫通させて橋台1に固定し、各橋桁8の下面両脇に這わせて架設されている。この高張力棒60の上に交差させる多数の鋼棒の交差棒61は、直交クランプ63を用いて固定してあり、橋桁8との当接部位にはゴム板等の緩衝材64をかませている。交差棒61も、機械式継手により継ぎ足し形成したものとすることができる。 The auxiliary support mechanism of this example includes two or more high-tensile bars 60 installed between one abutment 1 and the other abutment 1 so as to crawl the lower side of the upper structure 3 in the direction of the bridge axis, and the upper structure. 3 and one or more crossing rods 61 spanned by the high-tension rod 60 so as to crawl the lower side in the bridge width direction. The high-strength rod 60 of this example is formed by adding a mechanical joint 62, and both ends of the high-strength rod 60 are fixed to the abutment 1 through the parapet 1 c, and are erected on both sides of the lower surface of each bridge girder 8. Has been. A large number of steel bar crossing bars 61 crossing on the high-tensile bar 60 are fixed by using an orthogonal clamp 63, and a cushioning material 64 such as a rubber plate is put in contact with the bridge girder 8. ing. The cross bar 61 may also be formed by adding a mechanical joint.

その工法においては、まず、高張力棒60を所定の間隔で橋台1間に架設し、上部構造3の下側に橋軸方向へ這わせ、そして、交差棒61を、張り巡らされた高張力棒60の上に架け渡し直交クランプ63で止めることで、上部構造3の下側に橋幅方向へ這わせる工程を実施する。   In the construction method, first, high tension bars 60 are installed between the abutments 1 at a predetermined interval, and are placed under the upper structure 3 in the bridge axis direction, and the cross bars 61 are stretched around the high tension. A step of spanning the rod 60 in the bridge width direction is performed on the lower side of the upper structure 3 by being stopped by the crossing orthogonal clamp 63 over the rod 60.

このように、上部構造3の下側に、格子状の補助支持機構を張り巡らせることにより、伸縮継手10の連結機能に加えて下からも上部構造3が支えられるので、より確実に落橋を防止することができる。   In this way, by extending the lattice-like auxiliary support mechanism under the upper structure 3, the upper structure 3 is supported from the bottom in addition to the connection function of the expansion joint 10. can do.

なお、上記に説明した本発明に係る工法においては、その各工程の順番を入れ替えて実施することも可能で、つまり本発明の落橋防止工法における各工程は、記述順にとらわれるものではない。施工現場の状況に応じ工程を前後させて適宜実施することが好ましい。   In addition, in the construction method which concerns on this invention demonstrated above, it is also possible to replace the order of each process, that is, each process in the fallen bridge prevention construction method of this invention is not taken in order of description. It is preferable to carry out the process appropriately depending on the situation at the construction site.

図20及び図21に、図2とは違う形態の伸縮継手を用いた落橋防止装置の例を示す。   20 and 21 show an example of a falling bridge prevention device using an expansion joint having a different form from that of FIG.

図20に示すのは、フィンガー内に補強用リブ70が立設されたフィンガージョイント型の伸縮継手10の例で、この場合、リブ70を貫通して橋軸方向の貫通孔12が形成される。そして、該貫通孔12に、貫通パイプ28及び貫通棒体13が遊挿状態で橋軸方向へ挿入される。フィンガー部11間には緩衝材71が入れられ、下面はゴムシート72で覆われている。   FIG. 20 shows an example of a finger joint type expansion joint 10 in which reinforcing ribs 70 are erected in the fingers. In this case, the through holes 12 in the bridge axis direction are formed through the ribs 70. . The through pipe 28 and the through rod body 13 are inserted into the through hole 12 in the bridge axis direction in a loosely inserted state. A buffer material 71 is inserted between the finger portions 11, and the lower surface is covered with a rubber sheet 72.

図21に示すのは、変形ウエブ80とコンクリート81により形成されたフィンガージョイント型の伸縮継手10の例で、この場合はフィンガー部11において、ウエブ80のフィンガー側壁とフィンガー内コンクリート81とを貫通して橋軸方向へ貫通孔12が形成される。そして、該貫通孔12に、貫通パイプ28及び貫通棒体13が遊挿状態で橋軸方向へ挿入される。フィンガー部11間には同様に緩衝材82が入れられる。   FIG. 21 shows an example of a finger joint type expansion joint 10 formed by a deformed web 80 and concrete 81. In this case, the finger portion 11 penetrates the finger side wall of the web 80 and the concrete 81 inside the finger. Thus, the through hole 12 is formed in the bridge axis direction. The through pipe 28 and the through rod body 13 are inserted into the through hole 12 in the bridge axis direction in a loosely inserted state. A cushioning material 82 is similarly inserted between the finger portions 11.

図22には、突き合わせ型伸縮継手100の場合における落橋防止装置の例を示す。この伸縮継手100の場合、上部構造3の継目に、防水材101を間に挟んで鋼鉄製プレート102が対向配置されている。そして、その対向した各プレート102の貫通孔103を通して橋軸方向にボルト104が遊挿されており、該ボルト104の両端部をそれぞれワッシャ及びナット105にてプレート102の裏面に係止してある。すなわち、対向するプレート102を通したボルト104&ナット105にて伸縮継手100を連結し、継目が最大遊間を超えて広がろうとするときには繋ぎ止めるようにしたものである。当該落橋防止装置も、上記フィンガージョイント型の場合と同じく上部構造3どうしの作用で落橋を防止することができ、また、上記橋脚部/橋台部副支持機構、補助支持機構を併用することも可能である。   In FIG. 22, the example of the fallen bridge prevention apparatus in the case of the butt-type expansion joint 100 is shown. In the case of this expansion joint 100, a steel plate 102 is disposed opposite to the joint of the upper structure 3 with a waterproof material 101 interposed therebetween. Bolts 104 are loosely inserted in the direction of the bridge axis through the through-holes 103 of the plates 102 facing each other, and both ends of the bolts 104 are locked to the back surface of the plate 102 by washers and nuts 105, respectively. . In other words, the expansion joint 100 is connected by the bolt 104 and the nut 105 that are passed through the opposing plates 102, and is connected when the joint is going to spread beyond the maximum clearance. The falling bridge prevention device can also prevent the falling bridge by the action of the upper structures 3 as in the case of the finger joint type, and it is also possible to use the abutment part / abutment part auxiliary support mechanism and auxiliary support mechanism in combination. It is.

橋梁の下部構造、上部構造を示す概略図。Schematic showing the substructure and superstructure of the bridge. 本発明に係る落橋防止装置の伸縮継手を説明する要部平面図。The principal part top view explaining the expansion joint of the falling bridge prevention apparatus which concerns on this invention. 図2の伸縮継手の施工手順を説明する図。The figure explaining the construction procedure of the expansion joint of FIG. 図3の伸縮継手を要部断面で見て説明する図。The figure explaining the expansion joint of FIG. 図4の後続工程を説明する図。The figure explaining the subsequent process of FIG. 図5の工程で使用する発泡材の例を示す図。The figure which shows the example of the foam material used at the process of FIG. 図5の後続工程を説明する図。The figure explaining the subsequent process of FIG. 図7の後続工程を説明する図。The figure explaining the subsequent process of FIG. 図8の後続工程を説明する図。The figure explaining the subsequent process of FIG. 図9の後の上部構造への施工状態を説明する要部断面図(断面線省略)。FIG. 10 is a cross-sectional view of an essential part for explaining a construction state of the upper structure after FIG. 9 (cross-sectional line omitted). 機械式継手を使用した貫通棒体の例を示す図。The figure which shows the example of the penetration rod body which uses a mechanical coupling. 貫通棒体の係止状態を説明する地覆部分の橋軸方向から見た図。The figure seen from the bridge-axis direction of the ground cover part explaining the latching state of a through-bar body. 貫通棒体の係止状態を説明する地覆部分の橋幅方向から見た図。The figure seen from the bridge width direction of the ground cover part explaining the latching state of a penetration rod body. 本発明に係る落橋防止装置の橋脚部副支持機構を説明する要部断面図。The principal part sectional drawing explaining the pier part sub-support mechanism of the fallen bridge prevention apparatus which concerns on this invention. 図14の橋脚部副支持機構を橋軸方向から見た図。The figure which looked at the pier part auxiliary | assistant support mechanism of FIG. 14 from the bridge-axis direction. 本発明に係る落橋防止装置の橋台部副支持機構を説明する要部断面図。The principal part sectional drawing explaining the abutment part sub-support mechanism of the fallen bridge prevention apparatus which concerns on this invention. 本発明に係る落橋防止装置の補助支持機構を説明する図。The figure explaining the auxiliary | assistant support mechanism of the fallen bridge prevention apparatus which concerns on this invention. 図17の補助支持機構を橋軸方向から見た図。The figure which looked at the auxiliary support mechanism of FIG. 17 from the bridge-axis direction. 橋台間に架け渡された補助支持機構を説明する図。The figure explaining the auxiliary | assistant support mechanism spanned between the abutments. 本発明に係る落橋防止装置の伸縮継手について他の形態を示す図。The figure which shows another form about the expansion joint of the falling bridge prevention apparatus which concerns on this invention. 本発明に係る落橋防止装置の伸縮継手について他の形態を示す図。The figure which shows another form about the expansion joint of the falling bridge prevention apparatus which concerns on this invention. 突き合わせ型伸縮継手の場合の落橋防止装置の例を示す図。The figure which shows the example of the fallen bridge prevention apparatus in the case of a butt-type expansion joint.

符号の説明Explanation of symbols

1 橋台
1a 桁座
1b 支承
1c パラペット
2 橋脚
2a 桁座
2b 支承
3 上部構造
4 床版
5 地覆
6 高欄
7 鉄筋(床版中の)
8 橋桁
10 伸縮継手
11 フィンガー部
12 貫通孔
13 貫通棒体
14 端部(貫通棒体)
15 ナット
16 樹脂プレート
17 角ワッシャ
20 谷部分間隙
20’ 谷部分以外の間隙
21,25 樹脂シート(緩衝材)
22,26 シール剤(緩衝材)
23,27 発泡材(緩衝材)
28 貫通パイプ
1 Abutment 1a Girder 1b Bearing 1c Parapet 2 Bridge pier 2a Girder 2b Bearing 3 Superstructure 4 Floor slab 5 Ground cover 6 Rail 7 Rebar (in the slab)
8 Bridge Girder 10 Expansion Joint 11 Finger Part 12 Through Hole 13 Through Bar Body 14 End (Through Bar Body)
15 Nut 16 Resin plate 17 Square washer 20 Valley part gap 20 'Gap 21, 25 other than valley part Resin sheet (buffer material)
22, 26 Sealing agent (buffer material)
23, 27 Foam (buffer material)
28 Through pipe

Claims (5)

橋幅方向の貫通孔をフィンガー部にもつフィンガージョイント型で、上部構造の継目に設置される伸縮継手と、
前記貫通孔内に遊挿状態で挿入されて橋幅方向へ差し渡され、両端部を上部構造側方に係止させた貫通棒体と、
を含んで構成されることを特徴とする落橋防止装置。
A finger joint type with a through hole in the bridge width direction in the finger part,
A penetrating rod inserted into the through hole in a loosely inserted state and passed in the bridge width direction, with both ends locked to the side of the upper structure;
A fallen bridge prevention device comprising:
上部構造の下側を橋軸方向へ這うように橋台間に架設された2以上の高張力棒と、
上部構造の下側を橋幅方向へ這うように前記高張力棒に架け渡された交差棒と、
を含んで構成される補助支持機構をさらに含むことを特徴とする請求項1記載の落橋防止装置。
Two or more high-tensile bars erected between the abutments so as to crawl the lower side of the superstructure in the direction of the bridge axis;
A crossing rod spanned over the high tension rod so as to crawl the lower side of the superstructure in the bridge width direction;
The fallen bridge prevention device according to claim 1 , further comprising an auxiliary support mechanism configured to include
橋幅方向の貫通孔をフィンガー部にもつフィンガージョイント型の伸縮継手における互いに噛み合った前記フィンガー部間に緩衝材を入れる工程と、
前記貫通孔内に遊挿状態で貫通パイプを挿入して橋幅方向へ配管する工程と、
該配管後の伸縮継手におけるフィンガー部間を施工現場の条件に合わせた遊間状態に維持しつつ、当該伸縮継手を上部構造施工部位に配置すると共に該伸縮継手のアンカーを床版鉄筋に固定する工程と、
該上部構造施工部位にコンクリートを打設する工程と、
前記貫通パイプに貫通棒体を通した後、上部構造側方に突出した当該貫通棒体の両端部を係止させる工程と、
を含むことを特徴とする落橋防止工法。
A step of putting a cushioning material between the finger parts meshed with each other in a finger joint type expansion joint having a through-hole in the bridge width direction as a finger part;
Inserting a through pipe in a loosely inserted state in the through hole and piping in the bridge width direction; and
The process of arranging the expansion joint in the upper structure construction site and fixing the expansion joint anchor to the floor slab reinforcing while maintaining the gap between the fingers of the expansion joint after the piping in the condition of the construction site When,
Placing concrete in the superstructure construction site;
After passing through the through-rod body through the through-pipe, the step of locking both ends of the through-rod body protruding to the side of the upper structure;
A fallen bridge prevention method characterized by including
前記フィンガー部間に緩衝材を入れる工程において、
前記フィンガー部間を最大遊間状態として、該フィンガー部間の谷部分間隙に緩衝材を入れる工程と、
該谷部分間隙に緩衝材を入れたフィンガー部間を最小遊間状態として、該フィンガー部間の残りの部分の間隙に緩衝材を入れる工程と、
を実施することを特徴とする請求項3記載の落橋防止工法。
In the step of putting a cushioning material between the finger parts,
The step of putting a cushioning material in the valley portion gap between the finger portions, with the gap between the finger portions being the maximum free space state,
The step of putting the cushioning material in the gap of the remaining part between the finger parts, with the gap between the finger parts into which the cushioning material is put in the gap between the valleys as a minimum gap state,
The fallen bridge prevention method according to claim 3, wherein:
2以上の高張力棒を、所定の間隔で橋台間に架設し、上部構造の下側に橋軸方向へ這わせる工程と、
1以上の交差棒を、前記高張力棒に架け渡し、上部構造の下側に橋幅方向へ這わせる工程と、
をさらに含むことを特徴とする請求項3又は請求項4記載の落橋防止工法。
Laying two or more high-tensile bars between the abutments at predetermined intervals, and rolling them under the superstructure in the direction of the bridge axis;
Spanning one or more crossing bars over the high-tension bar and rolling them under the superstructure in the bridge width direction;
The fallen bridge prevention method according to claim 3 or 4 , further comprising:
JP2006193245A 2006-07-13 2006-07-13 Fall bridge prevention device and its construction method Expired - Fee Related JP4856484B2 (en)

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