JP2008163599A - Structure for anchoring main girder of bridge - Google Patents

Structure for anchoring main girder of bridge Download PDF

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JP2008163599A
JP2008163599A JP2006352516A JP2006352516A JP2008163599A JP 2008163599 A JP2008163599 A JP 2008163599A JP 2006352516 A JP2006352516 A JP 2006352516A JP 2006352516 A JP2006352516 A JP 2006352516A JP 2008163599 A JP2008163599 A JP 2008163599A
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bridge
cylindrical body
main girder
retaining rod
seat plate
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JP4263738B2 (en
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Katsumi Chuma
勝己 中馬
Toshinao Asakura
利尚 朝倉
Kohei Tsuda
康平 津田
Takumi Yamagata
琢己 山縣
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INFRASTRUCTURE RENEWAL ENGINEE
INFRASTRUCTURE RENEWAL ENGINEERING CO Ltd
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INFRASTRUCTURE RENEWAL ENGINEE
INFRASTRUCTURE RENEWAL ENGINEERING CO Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a structure for anchoring a main girder of a bridge, which soundly exerts a main-girder anchoring effect by overcoming the problem of the formation of a crack in a concrete base of a conventional embodiment, and which properly solves the problems of the vexatious complication and high cost of the on-side construction of the concrete base of the conventional embodiment by facilitating mounting operations. <P>SOLUTION: This structure for anchoring the main girder of the bridge comprises: an anchoring rod 3 which is raised from a bridge bottom surface 2 of a bridge pier 1 for supporting the main girder 7; a pressure-receiving seat plate 12 which allows the penetration and insertion of the anchoring rod 3, and which is anchored to the bridge bottom surface 2; a tubular body 13 into which the anchoring rod 3 is externally inserted, and which is integrally and rigidly connected to the seat plate 12; a reinforcing fin 14 which is radially arranged around the tubular body 13, and integrally and rigidly connected to the seat plate 12 and the tubular body 13; and a connecting plate 8 for connecting the main girder 7 and an upper end of the anchoring rod 3 protruding from an upper end of the tubular body 13. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は橋脚上に支持された主桁が地震等によりずれを生じ落橋に至る事態を防止する橋梁における主桁の引き留め構造に関わる。   The present invention relates to a main girder retaining structure in a bridge that prevents a situation in which a main girder supported on a pier is displaced due to an earthquake or the like to reach a falling bridge.

従来は図1に示すように、橋脚1の橋座面2にゴム支承等の支承11を介して支持された主桁7のずれ防止対策(落橋防止対策)として、上記橋脚1の橋座面2から引き留めロッド(アンカーロッド)3を立ち上げると共に、同橋座面2から該引き留めロッド3の周りに多数のアンカーピン4を立ち上げ、該アンカーピン4に補強鉄筋5を組筋し、該補強鉄筋5の周りに型枠を施してコンクリートを打設してコンクリート製台座6を現場構築し、該コンクリート製台座6から突出する引き留めロッド3上端と上記主桁7間を連結板8で連結し、主桁7を引き留めロッド3に引き留めする方法、即ち引き留めロッド3とコンクリート製台座6を介して橋脚1に引き留めする方法が採られている。   Conventionally, as shown in FIG. 1, as a measure for preventing the main girder 7 supported on the bridge seat surface 2 of the pier 1 via a support 11 such as a rubber bearing (a measure for preventing a falling bridge), the bridge seat surface of the pier 1 described above. The anchor rod (anchor rod) 3 is raised from 2, and a number of anchor pins 4 are raised from the bridge seat surface 2 around the anchor rod 3, and reinforcing reinforcing bars 5 are braided on the anchor pin 4, A concrete base 6 is constructed by placing a formwork around the reinforcing steel bars 5 to construct concrete, and the upper end of the retaining rod 3 protruding from the concrete base 6 and the main girder 7 are connected by a connecting plate 8. The main girder 7 is retained on the retaining rod 3, that is, a method is retained on the pier 1 via the retaining rod 3 and the concrete base 6.

上記引き留めロッド3とアンカーピン4は何れも橋座面2に削孔したアンカー孔9に挿入し、モルタル10を注入して橋座面2から一体に立ち上げるアンカー構造を採用している。   Both the retaining rod 3 and the anchor pin 4 are inserted into an anchor hole 9 drilled in the bridge seat surface 2, and an anchor structure in which the mortar 10 is injected to rise integrally from the bridge seat surface 2 is adopted.

然るに上記主桁7の引き留め構造においては、主桁7にずれを生じさせんとする外力が加わった場合、この外力が連結板8を介して引き留めロッド3に加わりコンクリート製台座6に集中した線圧を加え、この線圧によりコンクリート製台座6に図2Aに示すような押し抜き剪断C1、或いは図2Bに示すような割裂C2等の亀裂を生じ、耐力台座としての機能を喪失する問題点を有している。   However, in the retaining structure of the main girder 7, when an external force that causes a shift in the main girder 7 is applied, the external force is applied to the retaining rod 3 via the connecting plate 8 and concentrated on the concrete base 6. A pressure is applied, and this linear pressure causes a crack such as a punching shear C1 as shown in FIG. 2A or a split C2 as shown in FIG. 2B in the concrete pedestal 6 to lose its function as a load-bearing pedestal. Have.

又上記引き留めロッド3とアンカーピン4を橋脚1の橋座面2に埋設するためのアンカー孔9を削孔する際にドリルが橋脚1内の補強鉄筋と干渉し、所定位置に削孔を行い難くなり、引き留めロッド3とアンカーピン4を構造設計通り配設できず、設計通りの強度を得ることが困難になる問題を有している。   When drilling the anchor hole 9 for embedding the retaining rod 3 and the anchor pin 4 in the bridge seat surface 2 of the pier 1, the drill interferes with the reinforcing bar in the pier 1 and drills at a predetermined position. This makes it difficult to arrange the retaining rod 3 and the anchor pin 4 according to the structural design, which makes it difficult to obtain the strength as designed.

又現場で削孔し引き留めロッド3とアンカーピン4を立設し、補強鉄筋5を配筋し、型枠を組み、コンクリートを打設する極めて煩雑な作業を伴い、コストアップを招く問題を有している。   In addition, drilling at the site, standing up the retaining rod 3 and the anchor pin 4, arranging reinforcing steel bars 5, assembling the formwork, and placing concrete, there is a problem of increasing costs. is doing.

本発明は上記コンクリート製台座6の押し抜き剪断C1や割裂C2の発生、コンクリート製台座6の現場構築の煩雑さ、コスト高の問題を適切に解決し、引き留め効果を健全に発揮し得る橋梁における主桁の引き留め構造を提供するものである。   The present invention is a bridge that can appropriately solve the problems of the occurrence of the punching shear C1 and split C2 of the concrete pedestal 6, the complexity of construction of the concrete pedestal 6 on site, and the high cost, and can effectively exert the retaining effect. The main girder retaining structure is provided.

本発明に係る主桁の引き留め構造は、上記橋座面に受圧座板を定着し、該受圧座板に上記橋座面から立ち上げられた引き留めロッドを貫挿しつつ、該受圧座板に一体剛結合された筒体に貫挿し、該筒体を中心に補強フィンを放射状に配し、該補強フィンを上記受圧座板及び筒体と一体剛結合し、そして上記主桁と上記筒体の上端から突出する引き留めロッドの上端間を連結板にて連結し、主桁にずれを生じさせんとする外力を筒体に加え、該筒体に加わった外力を上記補強フィンを介して受圧座板に加え、該受圧座板の上記橋座面に対する定着座面で受圧するように構成したものである。   In the main girder retaining structure according to the present invention, a pressure-receiving seat plate is fixed to the bridge seat surface, and a retaining rod raised from the bridge seat surface is inserted into the pressure-receiving seat plate while being integrated with the pressure-receiving seat plate. The rigid fins are inserted into the rigidly coupled cylinders, the reinforcing fins are radially arranged around the cylindrical bodies, the reinforcing fins are integrally rigidly coupled to the pressure receiving seat plate and the cylindrical body, and the main girder and the cylindrical body The upper ends of the retaining rods protruding from the upper end are connected by a connecting plate, an external force that causes a shift in the main girder is applied to the cylinder, and the external force applied to the cylinder is received by the pressure receiving seat via the reinforcing fins. In addition to the plate, the pressure receiving seat plate is configured to receive pressure on the fixing seat surface with respect to the bridge seat surface.

上記受圧座板と筒体と補強フィンとは互いに剛結合され、更に該受圧座板と対向して上記筒体及び補強フィンと剛結合された補強板を設けて上記外力に対する耐力を向上することができる。   The pressure-receiving seat plate, the cylindrical body, and the reinforcing fins are rigidly coupled to each other, and a reinforcing plate that is rigidly coupled to the cylindrical body and the reinforcing fins is provided opposite to the pressure-receiving seat plate to improve resistance to the external force. Can do.

又上記引き留めロッドを上記筒体に遊挿すると共に、該引き留めロッドと筒体間の環状スペース内にセメントモルタル又は補強繊維入りポリマーセメントモルタルを充填し、該引き留めロッドに加わる外力を補強繊維入りポリマーセメントモルタルを介して筒体に伝達する構造を採ることができる。   Further, the retaining rod is loosely inserted into the cylindrical body, and a cement mortar or a polymer cement mortar containing a reinforcing fiber is filled in an annular space between the retaining rod and the cylindrical body, and an external force applied to the retaining rod is applied to the polymer containing the reinforcing fiber. It is possible to adopt a structure for transmitting to the cylinder through cement mortar.

本発明によれば前記従来例におけるコンクリート製台座の亀裂発生の問題を解消し、主桁の引き留め効果を健全に発揮し得る。又取り付け作業が容易であり、従来例におけるコンクリート製台座の現場構築の煩雑さ、コスト高の問題を適切に解決することができる。   According to the present invention, the problem of crack generation in the concrete pedestal in the conventional example can be solved, and the retaining effect of the main girder can be exhibited soundly. Also, the mounting work is easy, and the problem of the on-site construction of the concrete pedestal in the conventional example and the high cost can be solved appropriately.

以下、本発明を実施するための最良の形態を図3乃至図9に基づき説明する。
既知のように桁橋はH形鋼やT形鋼等から成る主桁7を橋幅方向に並列し、各主桁7を橋長方向において橋脚1上にゴム支承等の支承11を介して支持し、並列主桁7上に組筋して路盤コンクリートを打設し、該路盤コンクリート上に舗装を施す等の構造を有している。
Hereinafter, the best mode for carrying out the present invention will be described with reference to FIGS.
As is known, a girder bridge has main girder 7 made of H-shaped steel, T-shaped steel or the like arranged in parallel in the bridge width direction, and each main girder 7 is placed on a bridge pier 1 in the bridge length direction via a bearing 11 such as a rubber bearing. The road base concrete is supported and braided on the parallel main girder 7, and the road base concrete is paved.

上記主桁7を橋脚1に引き留めする落橋防止対策として、上記橋脚1の橋座面2から断面円形又は多角形の引き留めロッド(アンカーロッド)3を立ち上げ、該引き留めロッド3の上端と主桁7間を連結する基本構造を有しており、該引き留めロッド3に加わる外力に対する強度を強化し、主桁7を橋脚1に健全に引き留めする手段として、前記コンクリート製台座に代え、以下に述べる台座組立体を用いたものである。   As a measure for preventing a falling bridge by securing the main girder 7 to the pier 1, a retaining rod (anchor rod) 3 having a circular or polygonal section is raised from the bridge seat surface 2 of the pier 1, and the upper end of the retaining rod 3 and the main girder 7 as a means for strengthening the strength against the external force applied to the retaining rod 3 and for securely retaining the main girder 7 to the pier 1 instead of the concrete pedestal described below. A pedestal assembly is used.

上記引き留めロッド3は前記のように上記橋座面2にドリルを用いてアンカー孔9を削孔し、該アンカー孔9に引き留めロッド3の下端を挿入し、同孔9内にモルタル10等の接着材を注入して橋座面2から立ち上げる。   As described above, the retaining rod 3 drills the anchor hole 9 on the bridge seat surface 2 using a drill, inserts the lower end of the retaining rod 3 into the anchor hole 9, and inserts a mortar 10 or the like into the hole 9. Inject adhesive and start up from bridge surface 2.

図3乃至図9に示すように、上記台座組立体は引き留めロッド3が貫挿され且つ上記橋座面2に定着された受圧座板12を有し、該引き留めロッド3に外挿され且つ上記受圧座板12と一体剛結合された円形又は多角形の筒体13を有し、該筒体13を中心に放射状に配され且つ上記受圧座板12及び筒体13と一体剛結合された補強フィン14を有する。   As shown in FIGS. 3 to 9, the pedestal assembly includes a pressure receiving seat plate 12 through which the retaining rod 3 is inserted and fixed to the bridge seat surface 2, and is externally attached to the retaining rod 3 and is Reinforcement having a circular or polygonal cylinder 13 integrally rigidly connected to the pressure receiving seat plate 12, and radially arranged around the cylinder 13 and integrally rigidly connected to the pressure receiving seat plate 12 and the cylinder 13. Fins 14 are provided.

そして上記筒体13の上端から突出する引き留めロッド3の上端と上記主桁7間を連結板8にて連結する引き留め構造としたものである。   The upper end of the retaining rod 3 protruding from the upper end of the cylindrical body 13 and the main girder 7 are connected by a connecting plate 8.

図3乃至図5は、上記筒体13の上端から突出する引き留めロッド3の上端が貫挿され且つ上記補強フィン14及び筒体13と一体剛結合された補強板16を有する台座組立体を示している。   3 to 5 show a pedestal assembly having a reinforcing plate 16 through which the upper end of the retaining rod 3 protruding from the upper end of the cylindrical body 13 is inserted and rigidly coupled integrally with the reinforcing fin 14 and the cylindrical body 13. ing.

図示の具体例に従い詳述すると、上記受圧座板12と補強板16を等径の円板で形成し、又は同多角形板で形成し、両者12,16を同心且つ上下に離間して平行に配し、両者12,16間を中心部に配した上記筒体13を介し連結する。即ち筒体13の下端を受圧座板12の中心部に溶接等にて剛結合し、同上端を補強板の中心部に溶接等にて剛結合し、受圧座板12と補強板16を同心に上下に対向せしめる。   More specifically, the pressure receiving seat plate 12 and the reinforcing plate 16 are formed of a disc having the same diameter, or formed of the same polygonal plate. The two plates 12 and 16 are concentrically spaced apart from each other in parallel. The two cylinders 12 and 16 are connected via the cylindrical body 13 arranged in the center. That is, the lower end of the cylindrical body 13 is rigidly connected to the central portion of the pressure receiving seat plate 12 by welding or the like, and the upper end is rigidly connected to the central portion of the reinforcing plate by welding or the like, so that the pressure receiving seat plate 12 and the reinforcing plate 16 are concentric. Make them face up and down.

更に上記受圧座板12と補強板16間に、両者12,16の中心部から、即ち筒体13の外周面から複数の補強フィン14を放射状に配し、該補強フィン14の下端縁を受圧座板12の上面に当接して溶接により剛結合すると共に、同上端縁を補強板16の下面に当接して溶接により剛結合する。   Further, a plurality of reinforcing fins 14 are arranged radially between the pressure receiving seat plate 12 and the reinforcing plate 16 from the center of both 12, 16, that is, from the outer peripheral surface of the cylindrical body 13, and the lower end edge of the reinforcing fin 14 is pressure-receiving. While abutting on the upper surface of the seat plate 12 and being rigidly coupled by welding, the upper end edge abuts on the lower surface of the reinforcing plate 16 and is rigidly coupled by welding.

上記補強フィン14は受圧座板12と補強板16の直径線状に配され、互いに周方向に等間隔に配する。   The reinforcing fins 14 are arranged in a diameter line shape of the pressure-receiving seat plate 12 and the reinforcing plate 16, and are arranged at equal intervals in the circumferential direction.

よって受圧座板12、筒体13、補強フィン14、補強板16を相互に剛結合した台座組立体を構成する。   Therefore, the base assembly which comprises the pressure-receiving seat board 12, the cylinder 13, the reinforcement fin 14, and the reinforcement board 16 is mutually comprised rigidly.

図6は上記台座組立体の他例として、補強板16を有しない同組立体を示している。   FIG. 6 shows the assembly having no reinforcing plate 16 as another example of the pedestal assembly.

図示の具体例に従い詳述すると、上記受圧座板12を円板で形成し、又は多角形板で形成し、該筒体13の下端を受圧座板12の中心部に溶接等にて剛結合して同中心部から垂直に立ち上げる。   More specifically, the pressure receiving seat plate 12 is formed of a circular plate or a polygonal plate, and the lower end of the cylindrical body 13 is rigidly coupled to the center of the pressure receiving seat plate 12 by welding or the like. Then stand up vertically from the center.

更に上記受圧座板12の中心部から、即ち筒体13の外周面から複数の補強フィン14を放射状に配し、該補強フィン14の下端縁を受圧座板12の上面に当接して溶接により剛結合する。上記補強フィン14は受圧座板12の直径線状に配し、互いに周方向に等間隔に配する。   Further, a plurality of reinforcing fins 14 are arranged radially from the central portion of the pressure receiving seat plate 12, that is, from the outer peripheral surface of the cylindrical body 13, and the lower end edge of the reinforcing fin 14 is brought into contact with the upper surface of the pressure receiving seat plate 12 by welding. Rigidly join. The reinforcing fins 14 are arranged in a diameter line shape of the pressure-receiving seat plate 12, and are arranged at equal intervals in the circumferential direction.

よって受圧座板12、筒体13、補強フィン14を相互に剛結合した台座組立体を構成する。   Therefore, a pedestal assembly in which the pressure receiving seat plate 12, the cylindrical body 13, and the reinforcing fins 14 are rigidly connected to each other is configured.

上記各例示の台座組立体を構成する受圧座板12、筒体13、補強フィン14、補強板16は金属製、適材として鋼製のものを用いる。   The pressure-receiving seat plate 12, the cylindrical body 13, the reinforcing fins 14, and the reinforcing plate 16 constituting the above-described pedestal assemblies are made of metal and made of steel as a suitable material.

而して図5A,B、図7、図9に示すように、上記各例示の台座組立体を前記橋脚1の橋座面2から立ち上げた引き留めロッド3に貫挿する。   Thus, as shown in FIGS. 5A, 5B, 7 and 9, the pedestal assemblies illustrated above are inserted into the retaining rod 3 raised from the bridge seat surface 2 of the pier 1.

よって台座組立体の中心部の筒体13内に引き留めロッド3を貫挿し、受圧座板12を橋座面2に定着し、筒体13から突出する引き留めロッド3の上端を連結板8の一端に設けた連結孔17に挿入(遊挿)し、更に連結板8の他端を主桁7のフランジ18に鋲又はボルト19にて連結する。   Therefore, the retaining rod 3 is inserted into the cylindrical body 13 at the center of the pedestal assembly, the pressure-receiving seat plate 12 is fixed to the bridge seat surface 2, and the upper end of the retaining rod 3 protruding from the cylindrical body 13 is connected to one end of the connecting plate 8. The other end of the connecting plate 8 is connected to the flange 18 of the main girder 7 with a gutter or bolt 19.

又は図3に示すように、橋座面2への取り付け前に、上記筒体13内に引き留めロッド3を貫挿し、引き留めロッド3と筒体13間の環状スペース20内に後記するセメントモルタル21等の接着材を充填して一体とした台座組立体を事前に用意し、該台座組立体を現場に運び、引き留めロッド3の下端を橋脚1の橋座面2に削孔したアンカー孔9に埋設し、受圧座板12を橋座面2に定着する。   Alternatively, as shown in FIG. 3, before the attachment to the bridge seat surface 2, the retaining rod 3 is inserted into the cylindrical body 13, and the cement mortar 21 described later in the annular space 20 between the retaining rod 3 and the cylindrical body 13. An pedestal assembly integrated with an adhesive material such as the like is prepared in advance, the pedestal assembly is transported to the site, and the lower end of the retaining rod 3 is drilled into the anchor hole 9 in the bridge seat surface 2 of the pier 1. The pressure receiving seat plate 12 is fixed to the bridge seat surface 2.

図5A、図6、図7に例示するように、上記引き留めロッド3は上記筒体13に遊挿すると共に、該引き留めロッド3と筒体13間の環状スペース20内にセメントモルタル21、好ましくは補強繊維入りポリマーセメントモルタルを充填し、引き留めロッド3を側倒せんとする外力(ずれ力)をセメントモルタル21、補強繊維入りポリマーセメントモルタルを介して筒体13に伝達する構成とする。即ち連結板8の一端に設けた連結孔17に引き留めロッド3の上端を遊挿し連結する場合、該遊挿間隙分だけ連結板8の移動を許容し、これを超える移動を生じさせる外力を引き留めロッド3に加える。   As illustrated in FIGS. 5A, 6, and 7, the retaining rod 3 is loosely inserted into the cylindrical body 13, and cement mortar 21, preferably in an annular space 20 between the retaining rod 3 and the cylindrical body 13. A configuration is adopted in which a polymer cement mortar containing reinforcing fibers is filled and an external force (displacement force) with the retaining rod 3 as a side tilt is transmitted to the cylinder 13 via the cement mortar 21 and the polymer cement mortar containing reinforcing fibers. That is, when the upper end of the retaining rod 3 is loosely inserted and connected to the connecting hole 17 provided at one end of the connecting plate 8, the movement of the connecting plate 8 is allowed by the loose insertion gap, and the external force that causes the movement beyond this is retained. Add to rod 3.

上記筒体13の内径は引き留めロッド3の外径より充分に大径にし、該筒体13の中心部に引き留めロッド3を挿入することにより、引き留めロッド3と筒体13間に上記環状スペース20を形成し充分な量の上記セメントモルタル21を充填する。   The inner diameter of the cylindrical body 13 is sufficiently larger than the outer diameter of the retaining rod 3, and the retaining rod 3 is inserted into the center of the tubular body 13, whereby the annular space 20 is interposed between the retaining rod 3 and the cylindrical body 13. And a sufficient amount of the cement mortar 21 is filled.

セメントモルタル21の性質を改善する目的で種々のポリマー混和材が用いられており、代表例としてセメントと砂の混練材から成るセメントモルタル中にポリマー樹脂を配合し強度を増加したポリマーセメントモルタル21を用いる。   Various polymer admixtures are used for the purpose of improving the properties of the cement mortar 21. As a typical example, the polymer mortar 21 having a strength increased by blending a polymer resin into a cement mortar composed of a cement and sand kneaded material is used. Use.

又上記ポリマーセメントモルタル21に補強樹脂繊維、即ち合成樹脂製の短繊維を配合することによって更に強度を高めた繊維入りポリマーセメントモルタル21を用いる。   Further, a fiber-containing polymer cement mortar 21 that is further enhanced in strength by blending reinforcing resin fibers, that is, short fibers made of synthetic resin, into the polymer cement mortar 21 is used.

又は図5B、図8、図9に例示するように、上記筒体13内に引き留めロッド3を近接又は接触状態に貫挿し、連結板8を介して引き留めロッド3に加わる側倒せんとする外力(ずれ力)を筒体13に直接伝達する構成とする。   Alternatively, as illustrated in FIGS. 5B, 8, and 9, an external force that inserts the retaining rod 3 into the cylindrical body 13 in a close or contact state and applies side tension to the retaining rod 3 via the connecting plate 8. A configuration in which (shift force) is directly transmitted to the cylinder 13 is adopted.

従って筒体13の内径と引き留めロッド3の外径は略同径とし、引き留めロッド3の周面と筒体13内周面間に僅かな環状空隙を形成するか、接触状態にする。連結板8の一端に設けた連結孔17に引き留めロッド3の上端を遊挿し連結する場合、該遊挿間隙分だけ連結板8の移動を許容し、これを超える移動を生じさせる外力を引き留めロッド3に加える。   Accordingly, the inner diameter of the cylindrical body 13 and the outer diameter of the retaining rod 3 are substantially the same diameter, and a slight annular gap is formed between the peripheral surface of the retaining rod 3 and the inner peripheral surface of the cylindrical body 13 or brought into contact. When the upper end of the retaining rod 3 is loosely inserted into and connected to the connecting hole 17 provided at one end of the connecting plate 8, the connecting plate 8 is allowed to move by the amount of the loose insertion gap, and an external force that causes a movement exceeding this is retained by the retaining rod. Add to 3.

上記受圧座板12と補強板16、少なくとも受圧座板12は下面が平面である板材を用い、該受圧座板12の下面を橋脚1の平面から成る橋座面2に密接し、定着する。即ち面接触する。この場合受圧座板12の下面に多数の突起を設け、橋座面2に対する食い付き効果を持たせることができる。   The pressure-receiving seat plate 12 and the reinforcing plate 16, at least the pressure-receiving seat plate 12, use a plate material having a flat lower surface, and the lower surface of the pressure-receiving seat plate 12 is brought into close contact with the bridge seat surface 2 formed by the plane of the pier 1 to be fixed. That is, it makes surface contact. In this case, a large number of protrusions can be provided on the lower surface of the pressure-receiving seat plate 12 to give a biting effect on the bridge seat surface 2.

又は図5A等に示すように、受圧座板12の下面を定着モルタル層22を介して接着しつつ定着する。この定着モルタル層22は橋座面2の表面を均一な平面にする目的と、台座組立体を橋座面2の定位置に設置して筒体13の中心部に引き留めロッド3が挿入された状態を保持する目的を持って設けられたものであり、この定着モルタル層22によって主桁7に加わる外力に対する耐力を生じさせるために設けられたものではない。   Alternatively, as shown in FIG. 5A and the like, fixing is performed while the lower surface of the pressure receiving seat plate 12 is bonded via the fixing mortar layer 22. The fixing mortar layer 22 has the purpose of making the surface of the bridge seat surface 2 a uniform plane, and the pedestal assembly is installed at a fixed position of the bridge seat surface 2 so that the retaining rod 3 is inserted into the center of the cylinder 13. The fixing mortar layer 22 is provided for the purpose of maintaining the state, and is not provided for generating a resistance against an external force applied to the main beam 7.

而して地震等により主桁7に過大なずれ力が加わった場合、該ずれ力は連結板8を介して引き留めロッド3に加わり、更に引き留めロッド3から筒体13と補強フィン14を介して受圧座板12に加わり、該受圧座板12の下面を橋座面2に強力に押し付ける力を生じせしめ、この面耐圧により主桁7の引き留め効果を発揮する。   Thus, when an excessive displacement force is applied to the main girder 7 due to an earthquake or the like, the displacement force is applied to the retaining rod 3 via the connecting plate 8 and further from the retaining rod 3 via the cylinder 13 and the reinforcing fin 14. A force is applied to the pressure-receiving seat plate 12 to strongly press the lower surface of the pressure-receiving seat plate 12 against the bridge seat surface 2, and the retaining effect of the main girder 7 is exhibited by this surface pressure resistance.

上記台座組立体を用いた引き留め構造によれば、前記図2に示した従来例におけるコンクリート製台座の押し抜き剪断C1、割裂C2を発生し、主桁7の引き留め機能を喪失する問題を有効に解消し、同引き留め機能を健全に果たし得る。   According to the retaining structure using the pedestal assembly, it is possible to generate the punching shear C1 and split C2 of the concrete pedestal in the conventional example shown in FIG. It can be solved and the retention function can be performed soundly.

又取り付け作業が容易であり、従来例におけるコンクリート製台座の現場構築の煩雑さ、コスト高の問題を適切に解決することができる。   Also, the mounting work is easy, and the problem of the on-site construction of the concrete pedestal in the conventional example and the high cost can be solved appropriately.

従来の主桁の引き留め構造を示す断面図。Sectional drawing which shows the retention structure of the conventional main girder. A,Bは上記主桁の引き留め構造におけるコンクリート製台座の亀裂発生状態を示す平面図。A and B are top views which show the crack generation state of the concrete base in the retaining structure of the main girder. 本発明に係る引き留め構造に用いる台座組立体の斜視図。The perspective view of the base assembly used for the securing structure which concerns on this invention. 上記台座組立体の断面図。Sectional drawing of the said base assembly. Aは上記台座組立体を用いた引き留め構造の断面図、Bは上記台座組立体の他例を用いた引き留め構造の断面図。A is a sectional view of a retaining structure using the pedestal assembly, and B is a sectional view of a retaining structure using another example of the pedestal assembly. 上記台座組立体の他例を示す斜視図。The perspective view which shows the other examples of the said base assembly. 上記台座組立体を用いた引き留め構造の断面図。Sectional drawing of the securing structure using the said base assembly. 上記台座組立体の更に他例を示す斜視図。The perspective view which shows the other example of the said base assembly. 上記台座組立体を用いた引き留め構造の断面図。Sectional drawing of the securing structure using the said base assembly.

符号の説明Explanation of symbols

1…橋脚、2…橋座面、3…引き留めロッド、7…主桁、8…連結板、9…アンカー孔、10…モルタル、11…支承、12…受圧座板、13…筒体、14…補強フィン、16…補強板、17…連結孔、18…フランジ、19…鋲又はボルト、20…環状スペース、21…セメントモルタル、22…定着モルタル層、C1…押し抜き剪断、C2…割裂。   DESCRIPTION OF SYMBOLS 1 ... Bridge pier, 2 ... Bridge seat surface, 3 ... Retaining rod, 7 ... Main girder, 8 ... Connecting plate, 9 ... Anchor hole, 10 ... Mortar, 11 ... Bearing, 12 ... Pressure-receiving seat plate, 13 ... Cylindrical body, 14 DESCRIPTION OF SYMBOLS ... Reinforcement fin, 16 ... Reinforcement plate, 17 ... Connection hole, 18 ... Flange, 19 ... Reed or bolt, 20 ... Annular space, 21 ... Cement mortar, 22 ... Fixing mortar layer, C1 ... Punching shear, C2 ... Splitting.

Claims (3)

主桁を支持する橋脚の橋座面から立ち上げられた引き留めロッドを有し、該引き留めロッドが貫挿され且つ上記橋座面に定着された受圧座板を有し、該引き留めロッドに外挿され且つ上記受圧座板と一体剛結合された筒体を有し、該筒体を中心に放射状に配され且つ上記受圧座板及び筒体と一体剛結合された補強フィンを有し、上記主桁と上記筒体の上端から突出する引き留めロッドの上端間を連結する連結板を有することを特徴とする橋梁における主桁の引き留め構造。 A retaining rod raised from the bridge seating surface of the pier supporting the main girder, having a pressure receiving seat plate through which the retaining rod is inserted and fixed to the bridge seating surface, and extrapolated to the retaining rod And a cylindrical body integrally rigidly coupled with the pressure receiving seat plate, and having reinforcing fins radially disposed around the cylindrical body and integrally rigidly coupled with the pressure receiving seat plate and the cylindrical body, A retaining structure for a main girder in a bridge, comprising a connecting plate that connects between a girder and an upper end of a retaining rod protruding from the upper end of the cylindrical body. 上記筒体の上端から突出する引き留めロッドの上端が貫挿され且つ上記補強フィン及び筒体と一体剛結合された補強板を有することを特徴とする請求項1記載の橋梁における主桁の引き留め構造。 2. The retaining structure for a main girder in a bridge according to claim 1, further comprising a reinforcing plate that is inserted through an upper end of a retaining rod protruding from the upper end of the cylindrical body and is rigidly coupled integrally with the reinforcing fin and the cylindrical body. . 上記引き留めロッドを上記筒体に遊挿すると共に、該引き留めロッドと筒体間の環状スペース内にセメントモルタル又は補強繊維入りポリマーセメントモルタルを充填したことを特徴とする請求項1又は2記載の橋梁における主桁の引き留め構造。 3. The bridge according to claim 1, wherein the retaining rod is loosely inserted into the cylindrical body, and a cement mortar or a polymer cement mortar containing reinforcing fibers is filled in an annular space between the retaining rod and the cylindrical body. The main girder retention structure.
JP2006352516A 2006-12-27 2006-12-27 Retaining structure of main girder in bridge Expired - Fee Related JP4263738B2 (en)

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