JP4461914B2 - Temporary deadline structure and temporary deadline method - Google Patents

Temporary deadline structure and temporary deadline method Download PDF

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JP4461914B2
JP4461914B2 JP2004170714A JP2004170714A JP4461914B2 JP 4461914 B2 JP4461914 B2 JP 4461914B2 JP 2004170714 A JP2004170714 A JP 2004170714A JP 2004170714 A JP2004170714 A JP 2004170714A JP 4461914 B2 JP4461914 B2 JP 4461914B2
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precast
water stop
cylindrical
panels
temporary closing
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JP2005350904A (en
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正三 加藤
康博 飯田
浩二 上野
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株式会社大林組
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    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D19/00Keeping dry foundation sites or other areas in the ground
    • E02D19/02Restraining of open water
    • E02D19/04Restraining of open water by coffer-dams, e.g. made of sheet piles

Description

この発明は、既設橋脚基礎などの水中構造物を修理補強などの改修を行う際に用いられる仮締切構造体および仮締切工法に関するものである。   The present invention relates to a temporary closing structure and a temporary closing method used when repairing an underwater structure such as an existing pier foundation, such as repair and reinforcement.
仮締切構造体は、橋梁基礎などの水中構造物の改修を行う際に用いられ、プレキャストパネルを利用した仮締切構造体が、例えば、特許文献1に開示されている。   The temporary cutoff structure is used when repairing an underwater structure such as a bridge foundation, and a temporary cutoff structure using a precast panel is disclosed in, for example, Patent Document 1.
この特許文献1に開示されている仮締切構造体は、上空制限のある個所に好適に用いられるものであって、このような制限に対応するために、パネルを上下に分割し、施工現場でこれを積層するようにしていた。ところが、このような構成の仮締切構造体および仮締切工法には、仮締切工構造体の設置や撤去に大きなコストがかかり、工期も長くなるという技術的な課題があった。   The provisional deadline structure disclosed in Patent Document 1 is preferably used in a place where there is an upper limit, and in order to cope with such a restriction, the panel is divided into upper and lower parts at a construction site. This was laminated. However, the temporary closing structure and the temporary closing method having such a configuration have a technical problem that a large cost is required to install and remove the temporary closing structure and a construction period is prolonged.
そこで、本願発明者らは、このような課題が解決できる仮締切構造体および仮締切工法を開発して、特許文献2で既に提案している。この特許文献2に提案されている仮締切構造体は、水中構造物の外周を囲繞する複数の環状組立体を有していて、水中構造物の基礎部分に立設され、複数の環状組立体間を上下に貫通するようにアンカーを設置して、このアンカーに緊張力を導入して、最上段の環状組立体に定着させている。   Accordingly, the inventors of the present application have developed a temporary closing structure and a temporary closing method that can solve such problems and have already proposed in Patent Document 2. The provisional cutoff structure proposed in Patent Document 2 has a plurality of annular assemblies surrounding the outer periphery of the underwater structure, and is erected on the base portion of the underwater structure. An anchor is installed so as to penetrate vertically therethrough, and a tension force is introduced into the anchor so as to be fixed to the uppermost annular assembly.
また、各環状組立体は、所定高さの環状体を周方向に沿って、複数に分割したプレキャストパネルユニットを周方向の端部間に縦シール材を介装して、相互に連結したものであり、上下方向に積層される環状組立体の上下接合面には、横シール材を介装している。   In addition, each annular assembly is obtained by connecting a plurality of precast panel units obtained by dividing an annular body having a predetermined height along the circumferential direction with a vertical sealing material between circumferential ends. A horizontal sealing material is interposed on the upper and lower joint surfaces of the annular assemblies stacked in the vertical direction.
このような構成の仮締切構造体は、コストの増加や工期の長期化を招くことなく、せん断方向の力に対抗することができるものではあるが、以下に説明する技術的な課題があった。
特開平11−21908号公報 特願2003−279550号
The temporary closing structure having such a configuration can counteract the force in the shearing direction without incurring an increase in cost and lengthening of the construction period, but has technical problems described below. .
Japanese Patent Laid-Open No. 11-21908 Japanese Patent Application No. 2003-279550
すなわち、特許文献2に提案されている仮締切構造体は、橋梁基礎などの改修対象となる水中構造物の形状寸法に合わせて、鋼製のプレキャストパネルを設計・製作して、各現場に適用している。   In other words, the provisional deadline structure proposed in Patent Document 2 is designed and manufactured in accordance with the shape and dimensions of the underwater structure to be repaired, such as a bridge foundation, and applied to each site. is doing.
このため、プレキャストパネルが一現場ごとのオーダーメイドとなり、工事完了後は、基本的に廃材として取り扱われるので、コストダウンの障害になっていた。   For this reason, the precast panels are made to order for each site, and after the completion of construction, they are basically handled as waste materials, which has been an obstacle to cost reduction.
本発明は、このような従来の問題点に鑑みてなされたものであって、その目的とするところは、プレキャストパネルを転用可能にすることで、大幅なコストダウンを達成することができる仮締切構造体および仮締切工法を提供することにある。   The present invention has been made in view of such conventional problems, and the object of the present invention is to make provisional deadlines that can achieve a significant cost reduction by making the precast panel divertable. The object is to provide a structure and a temporary closing method.
上記目的を達成するために、本発明は、複数の平板状のプレキャストパネルと止水部材とを備え、前記プレキャストパネルの端面間に前記止水部材を介装させて、分離可能に連結して、橋梁基礎などの水中構造物の外周を囲撓するように設置され、前記水中構造物の修理,補強などの改修を行う際に用いる仮締切構造体であって、前記プレキャストパネルは、幅方向の両端面に設けられた所定角度の傾斜端面と、前記端面の中央部に上下方向に延設された半円状凹部と、前記プレキャストパネルの側面に設けられ、締結ボルトを装着して前記止水部材を挟持するブラケットとを備え、前記止水部材は、隣接する一対の前記プレキャストパネル間に介在して、これらのパネル間をピン結合させて屈曲状態を可変とする円筒鋼管と、シールパッキンとを備え、前記シールパッキンは、前記円筒鋼管を内部に収納し、隣接設置される一対の前記プレキャストパネルの前記凹部内に設置される筒状部を有している。 In order to achieve the above object, the present invention comprises a plurality of plate-like precast panels and a water stop member, and the water stop members are interposed between end faces of the precast panels so as to be separably connected. A temporary closing structure that is installed so as to surround an outer periphery of an underwater structure such as a bridge foundation and is used for repairing or repairing the underwater structure, wherein the precast panel has a width direction Inclined end faces with a predetermined angle provided on both end faces, a semicircular recess extending in the vertical direction at the center of the end face, and provided on the side face of the precast panel. and a bracket for holding the water element, said water-stop member is interposed between adjacent pair of the precast panel, a cylindrical steel pipe that varies the flexion by a pin coupling between these panels, Shirupakki With the door, the seal packing is housed the cylindrical steel pipe therein and has a cylindrical portion which is installed in the recess of the pair of the pre-cast panels arranged adjacently.
また、本発明は、複数の平板状のプレキャストパネルと止水部材とを備え、前記プレキャストパネルの端面間に前記止水部材を介装させて、分離可能に連結して、橋梁基礎などの水中構造物の外周を囲撓するように設置され、前記水中構造物の修理,補強などの改修を行う際に採用される仮締切工法であって、前記プレキャストパネルは、幅方向の両端面に設けられた所定角度の傾斜端面と、前記端面の中央部に上下方向に延設された半円状凹部と、前記プレキャストパネルの側面に設けられた締結ボルトの装着用ブラケットとを備え、前記止水部材は、隣接する一対の前記プレキャストパネル間に介在して、これらのパネル間をピン結合させて屈曲状態を可変とする円筒鋼管と、シールパッキンとを備え、前記シールパッキンは、前記円筒鋼管を内部に収納する筒状部を備え、前記プレキャストパネルを周方向に隣接して連結する際に、隣接設置される一対の前記プレキャストパネルの前記凹部内に、前記筒状部を設置して、前記装着用ブラケット間に締結ボルトを取付けて、前記止水部材を挟持するようにした。 Further, the present invention includes a plurality of flat precast panels and a water stop member, and the water stop member is interposed between the end faces of the precast panel so as to be separably connected to each other. A temporary closing method that is installed when the outer periphery of a structure is bent and is used for repairing or reinforcing the underwater structure, wherein the precast panels are provided on both end faces in the width direction. An inclined end face having a predetermined angle, a semicircular recess extending in the vertical direction at the center of the end face, and a mounting bolt mounting bracket provided on a side surface of the precast panel, member is interposed between adjacent pair of the precast panel, a cylindrical steel pipe that the flexion variable by a pin coupling between these panels, and a seal packing, the sealing packing, said cylinder A cylindrical portion that accommodates the tube therein, and when the precast panel is connected adjacently in the circumferential direction, the cylindrical portion is installed in the concave portion of the pair of precast panels that are installed adjacent to each other. A fastening bolt is attached between the mounting brackets so as to sandwich the water stop member.
このように構成した仮締切構造体および仮締切工法によれば、複数の平板状のプレキャストパネルは、端面間に止水部材を介装させて、分離可能に連結しているので、使用後に分離すると他の施工現場での転用が可能になる。   According to the temporary closing structure and the temporary closing method constructed as described above, the plurality of flat-plate precast panels are separably connected with the water-stopping member interposed between the end faces, so that they are separated after use. Then, diversion at other construction sites becomes possible.
この場合、プレキャストパネルを周方向に隣接して連結する際に、隣接設置される一対のプレキャストパネルの凹部内に、筒状部を設置して、装着用ブラケッ間に締結ボルトを取付けて、これを挟持するので、傾斜端面の傾斜角度に応じて、プレキャストパネルを多角形状に連結することができるとともに、止水性も確保することができる。   In this case, when connecting the precast panels adjacent to each other in the circumferential direction, a cylindrical portion is installed in a recess of a pair of adjacent precast panels, and a fastening bolt is attached between the mounting brackets. Therefore, according to the inclination angle of the inclined end face, the precast panel can be connected in a polygonal shape, and water-stopping property can be secured.
前記仮締切構造体においては、前記止水部材は、前記筒状部の外周に突設され、前記傾斜端面間にそれぞれ介装され、前記装着用ブラケット間に前記締結ボルトを取付けて、前記傾斜端面間に挟持される平板状のひれ部を設けることができる。   In the temporary closing structure, the water stop member protrudes from an outer periphery of the cylindrical portion, is interposed between the inclined end surfaces, and is attached with the fastening bolt between the mounting brackets. A flat fin portion sandwiched between the end faces can be provided.
また、前記仮締切工法においては、前記止水部材は、前記筒状部の外周に突設された平板状のひれ部を備え、前記ひれ部を前記傾斜端面間に介装して、前記装着用ブラケット間に前記締結ボルトを取付けて、前記ひれ部を挟持することができる。   Further, in the temporary closing method, the water stop member includes a flat fin portion protruding from an outer periphery of the cylindrical portion, and the fin portion is interposed between the inclined end surfaces, and the mounting is performed. The said fastening bolt can be attached between the brackets for use, and the said fin part can be clamped.
さらに、前記水中構造物には、前記プレキャストパネルの下端側を着脱可能に支持する枠体を予め設置することができる。   Furthermore, a frame that removably supports the lower end side of the precast panel can be installed in advance in the underwater structure.
本発明にかかる仮締切構造体および仮締切工法によれば、プレキャストパネルの転用が可能になるので、大幅なコストダウンを達成することができる。   According to the temporary closing structure and the temporary closing method according to the present invention, the precast panel can be diverted, so that significant cost reduction can be achieved.
以下、本発明の好適な実施の形態について、添付図面に基づいて詳細に説明する。   DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described in detail with reference to the accompanying drawings.
図1から図7は、本発明にかかる仮締切構造体および仮締切工法の一実施例を示している。これらの図に示す仮締切構造体および仮締切工法は、水中構造物である橋梁10の修理,補強などの改修工事を行う際に適用され、本実施例ではこのような適用例を示している。   1 to 7 show an embodiment of a temporary closing structure and a temporary closing method according to the present invention. The temporary closing structure and the temporary closing method shown in these drawings are applied when repair work such as repair and reinforcement of the bridge 10 that is an underwater structure is performed, and this embodiment shows such an application example. .
橋梁10は、橋脚12と、その下端に一体的に形成された基礎部分であるフーチング14とを備えている。橋脚12は、その水平断面が小判形のものであり、フーチング14も、平面形状が橋脚12と相似形の小判形状に形成されていて、その下端の一部が水底地盤16中に埋没している。   The bridge 10 includes a pier 12 and a footing 14 that is a foundation portion integrally formed at the lower end thereof. The bridge pier 12 has an oval horizontal cross section, and the footing 14 is also formed in an oval shape having a planar shape similar to that of the pier 12, and a part of the lower end thereof is buried in the underwater ground 16. Yes.
本実施例の仮締切構造体18は、複数の平板状のプレキャストパネル20を備えている。仮締切構造体18は、フーチング14の上面に固設される枠体22に、下端側が着脱可能に設置され、かつ、橋脚12の外周を囲撓するように設置され、その内部側の水を排水して、橋脚12の外周にドライな環境条件を創出し、橋脚12の修理,補強などの改修を行う際に使用される。   The temporary cutoff structure 18 according to the present embodiment includes a plurality of flat-plate precast panels 20. The temporary closing structure 18 is installed in a frame 22 fixed on the upper surface of the footing 14 so that the lower end side is detachable and surrounds the outer periphery of the pier 12, The drainage is used to create a dry environmental condition on the outer periphery of the pier 12 and to repair or reinforce the pier 12.
なお、枠体22は、橋脚12の外周を周回する小判形状に形成され、アンカー24によりフーチング14に固定される。また、この枠体22内には、仮締切構造体18の下端に当接して止水性を確保するパッキンが設けられる。   The frame body 22 is formed in an oval shape that goes around the outer periphery of the pier 12, and is fixed to the footing 14 by an anchor 24. Further, a packing is provided in the frame body 22 to contact the lower end of the temporary cutoff structure 18 to ensure water stoppage.
本実施例の場合、小判形状に形成された仮締切構造体18は、3段状に積層されて、橋脚12の外周を囲繞して、水面上に突出するように形成される。なお、詳細は図示していないが、段状に積層される仮締切構造体18間には、止水性のパッキンが介装される。   In the case of the present embodiment, the provisional shut-off structure 18 formed in an oval shape is stacked in three steps so as to surround the outer periphery of the pier 12 and protrude on the water surface. Although not shown in detail, a water-stopping packing is interposed between the temporary closing structures 18 stacked in a step shape.
また、段状に積層された仮締切構造体18は、これを上下方向に貫通するように設置されるアンカーボルト26により固定される。この場合、アンカーボルト26は、仮締切構造体18の小判形状に沿って、所定の間確を隔てて複数設置され、各アンカーボルト26は、下端側が枠体22に固定され、上端側は、最上段の仮締切構造体18にナット27を装着して定着される。   Further, the provisional deadline structure 18 stacked in a step shape is fixed by an anchor bolt 26 that is installed so as to penetrate the upper and lower direction. In this case, a plurality of anchor bolts 26 are installed at predetermined intervals along the oval shape of the temporary closing structure 18, and each anchor bolt 26 is fixed to the frame body 22 at the lower end side, A nut 27 is attached to the uppermost temporary closing structure 18 and fixed.
本実施例の場合、仮締切構造体18は、図2にその平面形状を示すように、複数の平板状プレキャストパネル20と止水部材21とを備え、プレキャストパネル20の幅方向の端面間に止水部材21をそれぞれ介装させて、分離可能に連結して、小判形状に形成されている。プレキャストパネル20は、例えば、鋼製ないしは鉄筋コンクリート製の平板状のものであって、所定の幅と長さとを備えた長方形状に形成されている。   In the case of the present embodiment, the temporary cutoff structure 18 includes a plurality of flat precast panels 20 and water-stopping members 21 as shown in a plan view in FIG. 2, and between the end faces in the width direction of the precast panels 20. Each of the water stop members 21 is interposed and connected in a separable manner to form an oval shape. The precast panel 20 is, for example, a flat plate made of steel or reinforced concrete, and is formed in a rectangular shape having a predetermined width and length.
各プレキャストパネル20は、その幅方向の端面形態を図4,5,7に示すように、所定傾斜角度の傾斜端面20aと、半円状凹部20bとが設けられている。また、プレキャストパネル20の内,外側面には、図3,6に示すように、複数の締結ボルト28の装着用ブラケット20cが設けられている。   Each precast panel 20 is provided with an inclined end surface 20a having a predetermined inclination angle and a semicircular recess 20b, as shown in FIGS. In addition, as shown in FIGS. 3 and 6, mounting brackets 20 c for a plurality of fastening bolts 28 are provided on the inner and outer surfaces of the precast panel 20.
半円状凹部20bは、パネル20の幅方向の端面のほぼ中央にあって、パネル20の長手方向に沿って、その全長に延設されている。傾斜端面20aは、半円状凹部20bの一方側にあって、所定の角度、例えば、15〜30°の角度だけ、パネルの端面を部分的に切欠することにより形成されている。   The semicircular recess 20 b is located approximately at the center of the end surface in the width direction of the panel 20 and extends along the longitudinal direction of the panel 20. The inclined end surface 20a is on one side of the semicircular recess 20b, and is formed by partially cutting the end surface of the panel by a predetermined angle, for example, an angle of 15 to 30 °.
このような傾斜端面20aは、例えば、プレキャストパネル20で多角形を形成する際には、端面20aが内側になるように配置される。なお、このような傾斜端面20aは、半円状凹部20bの一方側だけでなく、端面の全面に設けることもできる。   For example, when the precast panel 20 forms a polygon, the inclined end surface 20a is arranged so that the end surface 20a is on the inner side. Such an inclined end face 20a can be provided not only on one side of the semicircular recess 20b but also on the entire end face.
半円状凹部20bは、プレキャストパネル20を周方向に隣接設置すると、一対が対向するように位置対応していて、プレキャストパネル20を周方向に隣接設置すると、一対のプレキャストパネル20間に、対向する凹部20bにより概略円状の上下方向の貫通孔が形成される。   When the precast panel 20 is installed adjacent in the circumferential direction, the semicircular recess 20b corresponds to a position so that the pair faces each other. When the precast panel 20 is installed adjacent to the circumferential direction, the semicircular recess 20b faces between the pair of precast panels 20. A substantially circular vertical through-hole is formed by the recessed portion 20b.
装着用ブラケット20cは、周方向または上下方向に隣接設置されるプレキャストパネル20間に跨るように設置される締結ボルト28の装着が可能になるように、各パネル20間で位置対応するように、複数配置されている。   The mounting bracket 20c is positioned so as to correspond to the positions between the panels 20 so that the fastening bolts 28 installed so as to straddle between the precast panels 20 installed adjacently in the circumferential direction or the vertical direction can be mounted. Several are arranged.
止水部材21は、中空肉厚な円筒鋼管21aと、ゴム製のシールパッキン21bとから構成され、シールパッキン21bは、円筒鋼管21aが内部に収納された筒状部210bと、筒状部201bの外周から外方に突出する平板状の一対のひれ部211bとを備えている。   The water stop member 21 includes a hollow cylindrical steel pipe 21a and a rubber seal packing 21b. The seal packing 21b includes a cylindrical part 210b in which the cylindrical steel pipe 21a is housed, and a cylindrical part 201b. A pair of flat fin portions 211b projecting outward from the outer periphery of the plate.
このように構成された止水部材21は、仮締切構造体18を形成する際には、円筒鋼管21aを内部に収納した筒状部210bが、隣接設置される一対のプレキャストパネル20の凹部20b内に設置されるとともに、筒状部210bの外周に突設されたひれ部211bが、傾斜端面20a間に介装され、装着用ブラケット20c間に締結ボルト28を取付けて、傾斜端面20a間に挟持され、これにより内部の止水性が確保されることになる。   When the water stop member 21 thus configured forms the temporary cutoff structure 18, the cylindrical portion 210 b in which the cylindrical steel pipe 21 a is accommodated is formed in the recess 20 b of the pair of precast panels 20 that are adjacently installed. A fin portion 211b is installed between the inclined end surfaces 20a and is installed between the inclined end surfaces 20a. A fastening bolt 28 is attached between the mounting brackets 20c, and between the inclined end surfaces 20a. It is pinched, and thereby, the water stop inside is secured.
本実施例の場合、図2に示した仮締切構造体18の小判形の平面形状において、平行な部分は、プレキャストパネル20が、ほぼ一直線状になるように、相互に連結し、平行な部分の両端側の円弧状部分においては、プレキャストパネル20の端面に設けられた傾斜端面20aと、円筒鋼管21aを収納した筒状部210bを有するシールパッキン21bとで屈折可変なピン構造を構成していて、このピン構造を利用して、プレキャストパネル20を多角形状に配列することで、止水性を確保しながら小判形状となるようにしている。   In the case of the present embodiment, in the oval planar shape of the temporary closing structure 18 shown in FIG. 2, the parallel portions are connected to each other so that the precast panel 20 is substantially straight, and the parallel portions In the arc-shaped portions on both end sides, an inclined end surface 20a provided on the end surface of the precast panel 20 and a seal packing 21b having a cylindrical portion 210b in which the cylindrical steel pipe 21a is housed constitute a refraction variable pin structure. By using this pin structure, the precast panels 20 are arranged in a polygonal shape so as to have an oval shape while ensuring water-stopping properties.
なお、プレキャストパネル20を一直線状に連結する際には、傾斜端面20aが設けられていない部分の端面同士を接合するようにすればよい。また、複数のプレキャストパネル20を止水部材21を介在させて、連結させて、小判形状に形成した仮締切構造体18の内部側には、図1,2ないしは図3に示すように、内部支保工30や支保用ジャッキ32などを設置して、形状の安定化を図る。   In addition, what is necessary is just to make it join the end surfaces of the part in which the inclination end surface 20a is not provided, when connecting the precast panel 20 in a straight line form. Further, as shown in FIGS. 1, 2 or 3, the plurality of precast panels 20 are connected to each other with a water stop member 21 and are connected to each other to form an oval shape. A support 30 or a support jack 32 is installed to stabilize the shape.
このような形成した仮締切構造体18では、橋脚12の改修などの工事が終了すると、締結ボルト28をブラケット20cから取外すと、各プレキャストパネル20は、分離することができるので、そのまま他の工事現場に転用することができる。   In the temporary closing structure 18 formed as described above, when the work such as the repair of the pier 12 is completed, when the fastening bolt 28 is removed from the bracket 20c, each precast panel 20 can be separated. Can be diverted to the site.
次に、上記構成の仮締切構造体18を用いる仮締切工法について説明する。橋脚12の補修などを行う場合には、まず、図1に示すように、フーチング14の上面に枠体22が、橋脚12の外周を周回するように、小判形状に形成される。   Next, the temporary closing method using the temporary closing structure 18 configured as described above will be described. When repairing the pier 12 or the like, first, as shown in FIG. 1, the frame 22 is formed on the upper surface of the footing 14 in an oval shape so as to go around the outer periphery of the pier 12.
枠体22がアンカー24によりフーチング14に固定されると、枠体22の内部に下端側を挿入するようにして、仮締切構造体18が設置される。この場合、仮締切構造体18は、枠体22に対して、下端側が着脱可能に設置されるとともに、これらの間に止水用パッキンが介装される。   When the frame body 22 is fixed to the footing 14 by the anchor 24, the temporary closing structure 18 is installed so that the lower end side is inserted into the frame body 22. In this case, the temporary closing structure 18 is detachably installed at the lower end side with respect to the frame body 22, and a water stop packing is interposed therebetween.
仮締切構造体18は、複数の平板状のプレキャストパネル20の端面間に、それぞれ止水部材21を介装させて、各プレキャストパネル20を分離可能に連結して、橋脚12の外周を囲繞するように小判形状に形成される。   The temporary shut-off structure 18 surrounds the outer periphery of the pier 12 by interposing a water-stopping member 21 between the end faces of the plurality of flat-plate-shaped precast panels 20 and detachably connecting the precast panels 20. Thus, it is formed in an oval shape.
プレキャストパネル20は、幅方向の両端に設けられた所定角度の傾斜端面20aと、傾斜端面20のほぼ中央部に上下方向に延設された半円状凹部20bと、プレキャストパネル20の側面に設けられた締結ボルト28の装着ブラケット20cとを備えている。   The precast panel 20 is provided on inclined side surfaces 20a of a predetermined angle provided at both ends in the width direction, a semicircular recess 20b extending in the vertical direction at substantially the center of the inclined end surface 20, and provided on the side surfaces of the precast panel 20. The mounting bracket 20c of the fastening bolt 28 is provided.
また、止水部材21は、円筒鋼管21aを内部に収納する筒状部210bと、筒状部210bの外周に突設される平板状の一対のひれ部211bとを備えている。   Moreover, the water stop member 21 includes a cylindrical portion 210b that houses the cylindrical steel pipe 21a therein, and a pair of flat fin portions 211b that protrude from the outer periphery of the cylindrical portion 210b.
複数のプレキャストパネル20で小判形状の仮締切構造体18を形成する際には、プレキャストパネル20を順次周方向に隣接して連結することになる。この場合には、図6に示すように、隣接設置される一方のプレキャストパネル20の凹部20b内に、筒状部201bを挿入するようにして、止水部材21を設置し、止水部材21の外方から、他方のプレキャストパネル20を設置する。   When forming the oval temporary cut-off structure 18 with a plurality of precast panels 20, the precast panels 20 are sequentially connected adjacently in the circumferential direction. In this case, as shown in FIG. 6, the water stop member 21 is installed so that the tubular portion 201 b is inserted into the concave portion 20 b of one precast panel 20 that is adjacently installed, and the water stop member 21. The other precast panel 20 is installed from the outside.
この際に、他方のプレキャストパネル20の半円状凹部20bが、止水部材21の筒状部210bを外側から覆うように設置する。次いで、傾斜端面20a間にひれ部211bを介装させた状態で、装着ブラケット20c間に締結ボルト28を取付けて、ひれ部211bを傾斜端面20a間に挟持させる。   At this time, the semicircular recess 20b of the other precast panel 20 is installed so as to cover the tubular portion 210b of the water stop member 21 from the outside. Next, with the fin portion 211b interposed between the inclined end surfaces 20a, the fastening bolts 28 are attached between the mounting brackets 20c to sandwich the fin portion 211b between the inclined end surfaces 20a.
この場合、仮締切構造体18の小判形の平面形状において、平行な部分は、プレキャストパネル20が、ほぼ一直線状になるように、相互に連結し、平行な部分の両端側の円弧状部分においては、プレキャストパネル20の端面に設けられた傾斜端面20aを利用して、プレキャストパネル20間を屈折させるようにして連結して多角形状にすることで、止水性を確保しながら小判形状に形成する。   In this case, in the oval planar shape of the temporary closing structure 18, the parallel portions are connected to each other so that the precast panel 20 is substantially straight, and the arc-shaped portions on both end sides of the parallel portion. Is formed into an oval shape while ensuring water-stopping properties by using the inclined end surface 20a provided on the end surface of the precast panel 20 to form a polygonal shape by connecting the precast panels 20 so that they are refracted. .
1段分の仮締切構造体18が形成されると、順次上段側の仮締切構造体18を積層形成するが、この際に、構造体18間には、止水用のパッキンを介装し、所定段数の仮締切構造体18が形成されると、アンカーボルト26にナット27を装着して、所要の仮締切構造体18が得られ、内部に支保工30を設置して、形状ないしは構造の安定化を図る。   When the temporary cut-off structure 18 for one stage is formed, the temporary cut-off structure 18 on the upper stage is sequentially stacked. At this time, a packing for water stop is interposed between the structures 18. When the predetermined number of steps of the temporary closing structure 18 are formed, the nut 27 is attached to the anchor bolt 26 to obtain the required temporary closing structure 18, and the support 30 is installed inside, so that the shape or structure Stabilize.
橋脚12の補強,改修が終了すると、仮締切構造体18の解体撤去を行うことになるが、この場合には、締結ボルト28をブラケット20cから取外すと、各プレキャストパネル20は、分離することができるので、そのまま他の工事現場に転用することができる。   When reinforcement and repair of the pier 12 are completed, the temporary closing structure 18 is disassembled and removed. In this case, when the fastening bolt 28 is removed from the bracket 20c, each precast panel 20 can be separated. It can be used as it is for other construction sites.
さて、以上のように構成した仮締切構造体および仮締切工法によれば、複数の平板状のプレキャストパネル20は、端面間に止水部材21を介装させて、分離可能に連結しているので、使用後に分離すると他の施工現場での転用が可能になる。   Now, according to the temporary closing structure and the temporary closing method constructed as described above, the plurality of flat-plate precast panels 20 are connected to each other with the water-stopping member 21 interposed between the end faces. Therefore, if it is separated after use, it can be transferred to other construction sites.
この場合、プレキャストパネル20は、幅方向の両端面に設けられた所定角度の傾斜端面20aと、端面のほぼ中央部に上下方向に延設された半円状凹部20bと、プレキャストパネル20の側面に設けられた締結ボルト28の装着用ブラケット20cとを備え、止水部材21は、円筒鋼管21aを内部に収納する筒状部210bと、筒状部210bの外周に突設される平板状のひれ部211bとを備え、プレキャストパネル20を周方向に隣接して連結する際に、隣接設置される一対のプレキャストパネル20の凹部20b内に、筒状部210bを設置するとともに、傾斜端面20a間にひれ部211bをそれぞれ介装させた状態で、装着ブラケッ20c間に締結ボルト28を取付けて、ひれ部211bを傾斜端面20a間に挟持するので、傾斜端面20aの傾斜角度に応じて、プレキャストパネル20を多角形状に連結することができるとともに、止水性も確保することができる。   In this case, the precast panel 20 includes an inclined end surface 20a having a predetermined angle provided on both end surfaces in the width direction, a semicircular recess 20b extending in the vertical direction at a substantially central portion of the end surface, and a side surface of the precast panel 20. The water stop member 21 includes a cylindrical portion 210b that houses the cylindrical steel pipe 21a therein, and a flat plate-like shape that protrudes from the outer periphery of the cylindrical portion 210b. When connecting the precast panel 20 adjacent to each other in the circumferential direction, the tubular portion 210b is installed in the recess 20b of the pair of precast panels 20 that are installed adjacent to each other and between the inclined end surfaces 20a. With the fins 211b interposed, the fastening bolts 28 are attached between the mounting brackets 20c, and the fins 211b are sandwiched between the inclined end surfaces 20a. According to the inclination angle of the inclined end surface 20a, it is possible to connect the precast panel 20 into a polygonal shape, it is possible to also ensure water stopping.
なお、止水性の確保は、円筒鋼管21aを収納した筒状部210bをブラケット20c間に締結ボルト28を装着して、挟持することにより確保することができるので、ひれ部211bは、必ずしも必要としない。   In addition, since the securing of the water stop can be ensured by attaching the fastening bolt 28 between the brackets 20c and holding the cylindrical portion 210b accommodating the cylindrical steel pipe 21a, the fin portion 211b is not necessarily required. do not do.
また、上記実施例では、橋脚12の外周に、仮締切構造体18を多段状に積層設置する場合を例示したが、本発明の実施はこれに限定されることはなく、例えば、仮締切構造体18は、1段状のものであっても良い。   In the above embodiment, the case where the provisional deadline structure 18 is stacked and installed on the outer periphery of the pier 12 is exemplified. However, the implementation of the present invention is not limited to this, for example, the provisional deadline structure. The body 18 may be one-stage.
また、上記実施例では、小判断面の橋脚12の改修に本発明を適用した場合を例示したが、本発明の適用はこのような形状に限られることはなく、例えば、円形断面や多角形断面の水中構造物などにも適用することができる。   In the above embodiment, the case where the present invention is applied to the modification of the bridge pier 12 on the small judgment surface is illustrated, but the application of the present invention is not limited to such a shape. It can also be applied to underwater structures with cross sections.
本発明にかかる仮締切構造体では、特に、隣接するプレキャストパネル20間の凹部20b内に挿入された止水部材21の筒状部210bと円筒鋼管21aとが、ピン構造となっているので、以下の作用効果が得られる。   In the temporary cutoff structure according to the present invention, in particular, the cylindrical portion 210b of the water stop member 21 and the cylindrical steel pipe 21a inserted into the recess 20b between the adjacent precast panels 20 have a pin structure. The following effects can be obtained.
すなわち、ブラケット20cに締結ボルト28を装着して、ピン構造を介して結合されたプレキャストパネル20は、屈曲状態の変更が可能になっているので、例えば、円形断面や円弧状断面に形成する際に、パネル同士の競り合いが発生したときに、屈曲状態を変更して、微調整することができるので、施工現場において、円形,楕円断面や多角形断面など、実際に即した閉塞断面に対応することが容易に行える。   In other words, the precast panel 20 attached with the fastening bolt 28 to the bracket 20c and coupled via the pin structure can be changed in the bent state. For example, when the precast panel 20 is formed into a circular cross section or an arc cross section. In addition, when the competition between panels occurs, the bending state can be changed and fine adjustment can be performed, so it corresponds to the actual closed block such as a circular, elliptical or polygonal section at the construction site. Can be done easily.
本発明にかかる仮締切構造体および仮締切工法は、プレキャストパネルを他の工事現場で転用することができるので、橋脚の改修工事などに有効に活用することができる。   The temporary closing structure and the temporary closing method according to the present invention can be effectively used for repair work of a pier because the precast panel can be diverted to other construction sites.
本発明にかかる仮締切構造体および仮締切工法の一実施例を示す全体説明図である。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an overall explanatory view showing one embodiment of a temporary closing structure and a temporary closing method according to the present invention. 図1の要部水平断面図である。It is a principal part horizontal sectional view of FIG. 図2の要部拡大図である。It is a principal part enlarged view of FIG. 図3の要部拡大図である。It is a principal part enlarged view of FIG. 図1に示したプレキャストパネルの端面を示す斜視図である。It is a perspective view which shows the end surface of the precast panel shown in FIG. 図1に示したプレキャストパネルを連結する際の説明図である。It is explanatory drawing at the time of connecting the precast panel shown in FIG. 図1に示したプレキャストパネルの連結完了時の端面説明図である。It is end surface explanatory drawing at the time of the completion of the connection of the precast panel shown in FIG.
符号の説明Explanation of symbols
10 橋梁
12 橋脚
14 フーチング
18 仮締切構造体
20 プレキャストパネル
20a 傾斜端面
20b 半円状凹部
20c 装着用ブラケット
21 止水部材
21a 円筒鋼管
21b シールパッキン
210b 筒状部
211b ひれ部
28 締結ボルト
DESCRIPTION OF SYMBOLS 10 Bridge 12 Pier 14 Footing 18 Temporary cutoff structure 20 Precast panel 20a Inclined end surface 20b Semicircular recessed part 20c Mounting bracket 21 Water stop member 21a Cylindrical steel pipe 21b Seal packing 210b Cylindrical part 211b Fin part 28 Fastening bolt

Claims (5)

  1. 複数の平板状のプレキャストパネルと止水部材とを備え、前記プレキャストパネルの端面間に前記止水部材を介装させて、分離可能に連結して、橋梁基礎などの水中構造物の外周を囲撓するように設置され、前記水中構造物の修理,補強などの改修を行う際に用いる仮締切構造体であって、
    前記プレキャストパネルは、幅方向の両端面に設けられた所定角度の傾斜端面と、
    前記端面の中央部に上下方向に延設された半円状凹部と、
    前記プレキャストパネルの側面に設けられ、締結ボルトを装着して前記止水部材を挟持するブラケットとを備え、
    前記止水部材は、隣接する一対の前記プレキャストパネル間に介在して、これらのパネル間をピン結合させて屈曲状態を可変とする円筒鋼管と、シールパッキンとを備え、
    前記シールパッキンは、前記円筒鋼管を内部に収納し、隣接設置される一対の前記プレキャストパネルの前記凹部内に設置される筒状部を有することを特徴とする仮締め切り構造体。
    A plurality of flat-shaped precast panels and a water stop member are provided, and the water stop members are interposed between the end faces of the precast panel, and are separably connected to surround an outer periphery of an underwater structure such as a bridge foundation. A temporary closing structure that is installed to bend and is used when repairing or reinforcing the underwater structure,
    The precast panel has inclined end surfaces of a predetermined angle provided on both end surfaces in the width direction,
    A semicircular recess extending in the vertical direction at the center of the end surface;
    Provided on a side surface of the precast panel, and a bracket for attaching the fastening bolt to sandwich the water stop member,
    The water stop member is provided between a pair of adjacent precast panels, and includes a cylindrical steel pipe that is pin-bonded between these panels to change the bending state, and a seal packing.
    The said seal packing accommodates the said cylindrical steel pipe inside, and has a cylindrical part installed in the said recessed part of a pair of said precast panel adjacently installed, The temporary closing structure characterized by the above-mentioned.
  2. 前記止水部材は、前記筒状部の外周に突設され、前記傾斜端面間にそれぞれ介装され、前記装着用ブラケット間に前記締結ボルトを取付けて、前記傾斜端面間に挟持される平板状のひれ部を備えたことを特徴とする請求項1記載の仮締め切り構造体。 The water-stop member protrudes from the outer periphery of the cylindrical portion, is interposed between the inclined end surfaces, and has a flat plate shape that is clamped between the inclined end surfaces by attaching the fastening bolt between the mounting brackets. The provisional deadline structure according to claim 1, further comprising a fin portion.
  3. 複数の平板状のプレキャストパネルと止水部材とを備え、前記プレキャストパネルの端面間に前記止水部材を介装させて、分離可能に連結して、橋梁基礎などの水中構造物の外周を囲撓するように設置され、前記水中構造物の修理,補強などの改修を行う際に採用される仮締切工法であって、
    前記プレキャストパネルは、幅方向の両端面に設けられた所定角度の傾斜端面と、
    前記端面の中央部に上下方向に延設された半円状凹部と、
    前記プレキャストパネルの側面に設けられた締結ボルトの装着用ブラケットとを備え、
    前記止水部材は、隣接する一対の前記プレキャストパネル間に介在して、これらのパネル間をピン結合させて屈曲状態を可変とする円筒鋼管と、シールパッキンとを備え、
    前記シールパッキンは、前記円筒鋼管を内部に収納する筒状部を備え、
    前記プレキャストパネルを周方向に隣接して連結する際に、隣接設置される一対の前記プレキャストパネルの前記凹部内に、前記筒状部を設置して、前記装着用ブラケット間に締結ボルトを取付けて、前記止水部材を挟持することを特徴とする仮締切工法。
    A plurality of flat-shaped precast panels and a water stop member are provided, and the water stop members are interposed between the end faces of the precast panel, and are separably connected to surround an outer periphery of an underwater structure such as a bridge foundation. It is a temporary closing method that is installed to bend and is used when repairing or reinforcing the underwater structure,
    The precast panel has inclined end surfaces of a predetermined angle provided on both end surfaces in the width direction,
    A semicircular recess extending in the vertical direction at the center of the end surface;
    A mounting bolt mounting bracket provided on a side surface of the precast panel;
    The water stop member is provided between a pair of adjacent precast panels, and includes a cylindrical steel pipe that is pin-bonded between these panels to change the bending state, and a seal packing.
    The seal packing includes a cylindrical portion that houses the cylindrical steel pipe therein,
    When connecting the precast panels adjacent to each other in the circumferential direction, the cylindrical portion is installed in the recess of the pair of precast panels installed adjacent to each other, and a fastening bolt is attached between the mounting brackets. A temporary closing method characterized by sandwiching the water stop member.
  4. 前記止水部材は、前記筒状部の外周に突設された平板状のひれ部を備え、
    前記ひれ部を前記傾斜端面間に介装して、前記装着用ブラケット間に前記締結ボルトを取付けて、前記ひれ部を挟持することを特徴とする請求項3記載の仮締切工法。
    The water stop member includes a flat fin portion protruding from the outer periphery of the cylindrical portion,
    The temporary closing method according to claim 3 , wherein the fin portion is interposed between the inclined end faces, the fastening bolt is attached between the mounting brackets, and the fin portion is clamped.
  5. 前記水中構造物に、前記プレキャストパネルの下端側を着脱可能に支持する枠体を予め設置することを特徴とする請求項3記載の仮締切工法。 The temporary closing method according to claim 3 , wherein a frame that removably supports a lower end side of the precast panel is installed in advance in the underwater structure.
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JP4793634B2 (en) * 2006-02-03 2011-10-12 清水建設株式会社 Temporary deadline construction method
JP6258022B2 (en) * 2013-12-02 2018-01-10 鹿島建設株式会社 Temporary deadline structure
JP6378662B2 (en) * 2015-04-30 2018-08-22 株式会社サンリツ Manhole levitation prevention device
CN104805857B (en) * 2015-05-06 2016-09-28 中铁十六局集团第三工程有限公司 One detachably recycles bottomless steel jacket box and construction method thereof
JP6475310B2 (en) * 2017-12-06 2019-02-27 鹿島建設株式会社 Temporary deadline structure
CN112627208A (en) * 2020-12-04 2021-04-09 上海市政工程设计研究总院(集团)有限公司 Assembled cofferdam suitable for rock foundation and construction method thereof
CN112709252A (en) * 2020-12-25 2021-04-27 中铁广州工程局集团有限公司 Bearing platform construction method in semi-water flooding steep rock slope

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