JP6247041B2 - One-way movable bearing device for bridges - Google Patents

One-way movable bearing device for bridges Download PDF

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JP6247041B2
JP6247041B2 JP2013159152A JP2013159152A JP6247041B2 JP 6247041 B2 JP6247041 B2 JP 6247041B2 JP 2013159152 A JP2013159152 A JP 2013159152A JP 2013159152 A JP2013159152 A JP 2013159152A JP 6247041 B2 JP6247041 B2 JP 6247041B2
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slide plate
shear
movable block
slide
bridge
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JP2015030993A (en
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合田　裕一
裕一 合田
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Miwa Tech Co Ltd
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Description

本発明は、橋梁用可動支承装置に関し、さらに詳しくは、橋軸方向への移動を許容し、これと直角な方向への移動を制限する橋梁用一方向可動支承装置の改良に関するものである。   The present invention relates to a movable support device for a bridge, and more particularly to an improvement of a one-way movable support device for a bridge that allows movement in the direction of the bridge axis and restricts movement in a direction perpendicular thereto.

例えば、橋梁の橋桁は、温度の変化等によって、桁方向（橋軸方向）に伸縮を受ける。したがって、橋桁の建設にあっては、橋軸方向の橋桁の移動を許容し、これと直角な方向への移動を制限する機構を有する橋梁用可動支承装置がこれまで広く使用されてきた。   For example, a bridge girder of a bridge undergoes expansion and contraction in the girder direction (bridge axis direction) due to a change in temperature or the like. Therefore, in the construction of a bridge girder, a movable support device for a bridge having a mechanism that allows the movement of the bridge girder in the direction of the bridge axis and restricts the movement in a direction perpendicular thereto has been widely used.

これによれば、橋梁の下部橋梁側に固定されたゴム支承体の上部に固定された上沓部材の橋軸と直角な方向の両側面を、下部橋梁に固定された下沓部材に固定されたサイドブロックに当接させ、これにより橋桁の橋軸方向への移動を許容し、これと直角な方向への移動を制限するものであった（例えば、特許文献１参照）。   According to this, both sides in the direction perpendicular to the bridge axis of the upper bridge member fixed to the upper part of the rubber support fixed to the lower bridge side of the bridge are fixed to the lower bridge member fixed to the lower bridge. In this manner, the bridge girder is allowed to abut on the side block, thereby allowing the bridge girder to move in the direction of the bridge axis and restricting the movement in the direction perpendicular to the bridge girder (see, for example, Patent Document 1).

また、本出願人が出願した案件（特許文献２）には、橋軸方向と直角方向の移動をせん断拘束部材で阻止し、橋軸方向に伸びる長穴を形成したスライド板に対して可動ブロックを長穴に沿って移動可能とした橋梁用一方向可動支承装置が開示されている。   In addition, in the case filed by the present applicant (Patent Document 2), the movable block against the slide plate in which the movement in the direction perpendicular to the bridge axis direction is blocked by the shear restraining member and the elongated hole extending in the bridge axis direction is formed. A one-way movable bearing device for a bridge that can move along a long hole is disclosed.

特開２００５−２０７０２０号公報JP 2005-207020 A 特開２００９−２３５８４６号公報JP 2009-235846 A

しかしながら、特許文献１で開示された橋梁用可動支承装置は、橋軸と直角な方向の移動を制限するためにサイドブロックを下部構造側に固定しなければならず、狭いスペースにサイドブロックを配置することで、他の支承構造の配置の自由度が制限されるという問題を有する。   However, in the movable support device for bridge disclosed in Patent Document 1, the side block must be fixed to the lower structure side in order to limit the movement in the direction perpendicular to the bridge axis, and the side block is arranged in a narrow space. By doing so, there is a problem that the degree of freedom of arrangement of other support structures is limited.

また、特許文献２で開示された橋梁用可動支承装置は、可動ブロックの形状が複雑でスライド板と可動ブロックとの間のスライドに多少問題がある点と、長穴に塵埃が入る込みスライドしにくくなるという問題を有するものであった。   In addition, the movable support device for bridge disclosed in Patent Document 2 has a complicated shape of the movable block, and there are some problems in the slide between the slide plate and the movable block, and a slide in which dust enters the elongated hole. It had the problem of becoming difficult.

本発明は、従来技術のもつ課題を解決する、構造が簡単で設置スペースを節約でき、耐久性のある橋梁用一方向可動支承装置を提供することを目的とする。   An object of the present invention is to provide a one-way movable bearing device for a bridge that solves the problems of the prior art, has a simple structure, can save installation space, and is durable.

本発明の橋梁用一方向可動支承装置は、前記課題を解決するために、上下構造側の一方の側に固定され一方向に伸びる長穴と、前記長穴の周囲を取り囲むように突設し上下構造の一方の側に形成された凹部の内壁と係合するせん断キーを形成し、一方の面をスライド面としたスライド板と、前記上下構造の他方の側に一端を固定され前記長穴を貫通するせん断拘束部材と、一方の面に前記スライド板の前記スライド面と接するスライド面を有し、前記スライド板と当接する面の中央に前記長穴の内壁面と面接触する断面形状のガイド部が突設され、前記せん断拘束部材が嵌合する貫通穴を前記ガイド部に形成した可動ブロックと、を備えることを特徴とする。
In order to solve the above problems, a one-way movable bearing device for a bridge according to the present invention is provided with a long hole fixed to one side of the upper and lower structure side and extending in one direction, and protruding so as to surround the periphery of the long hole. A slide key that engages with an inner wall of a recess formed on one side of the upper and lower structure, and a slide plate having one surface as a slide surface, and one end fixed to the other side of the upper and lower structure and the elongated hole A cross-sectional shape that has a shear restraining member penetrating through the surface, a slide surface in contact with the slide surface of the slide plate on one surface, and a surface contact with the inner wall surface of the elongated hole at the center of the surface in contact with the slide plate And a movable block in which a through hole into which the shearing restraining member is fitted is formed in the guide portion .

また、本発明の橋梁用一方向可動支承装置は、前記スライド板のスライド面に低摩擦材を配置することを特徴とする。   Moreover, the one-way movable bearing device for a bridge according to the present invention is characterized in that a low friction material is disposed on the slide surface of the slide plate.

また、本発明の橋梁用一方向可動支承装置は、前記上下構造のいずれか他方の側に弾性支承を配し、前記せん断拘束部材が前記弾性支承を貫通して配され、前記弾性支承に前記可動ブロックの他方の面が接するように配置することを特徴とする。
In the unidirectional movable bearing device for a bridge according to the present invention, an elastic bearing is disposed on either side of the upper and lower structures, the shear restraining member is disposed through the elastic bearing, and the elastic bearing is provided with the elastic bearing. It arrange | positions so that the other surface of a movable block may contact | connect.

上下構造側の一方の側に固定され一方向に伸びる長穴と、前記長穴の周囲を取り囲むように突設し上下構造の一方の側に形成された凹部の内壁と係合するせん断キーを形成し、一方の面をスライド面としたスライド板と、前記上下構造の他方の側に一端を固定され前記長穴を貫通するせん断拘束部材と、一方の面に前記スライド板の前記スライド面と接するスライド面を有し、前記スライド板と当接する面の中央に前記長穴の内壁面と面接触する断面形状のガイド部が突設され、前記せん断拘束部材が嵌合する貫通穴を前記ガイド部に形成した可動ブロックと、を備えることで、橋軸直角方向の水平力に対してスライド板の長穴を貫通するせん断拘束部材で対応するのでサイドブロックの設置スペースを節約することができ、部材の配置の自由度を確保することができる。その際、上部構造からの橋軸直角方向の水平力は、直接せん断拘束部材に負荷されるのではなく、せん断拘束部材に嵌合された可動ブロックとの面接触部を介してせん断拘束部材に均等に伝達されるので、せん断拘束部材の一部に応力が集中することがなく、せん断拘束部材の径を小さくすることができる。また、橋軸方向の水平力に対しては、スライド板の長穴に沿って可動ブロックのガイド部がスライドすることにより対応する。その際、スライドに伴う摩擦力を可動ブロックとスライド板とのスライド面がスムーズにスライドすることにより負担し、せん断拘束部材の摩擦力による負荷をなくすことができ、せん断拘束部材の長寿命化を図ることができる。
スライド板に上下構造の一方の側に形成されたキー溝の嵌合するせん断キーを長穴の周囲を取り囲むように突設することで、せん断キーが橋軸直角方向の水平力に対するせん断キーとして機能し、長穴に塵埃が侵入するのを防止できる。
スライド板のスライド面に低摩擦材を配置することで、橋軸方向の水平力に対するスライド板と可動ブロックとのスライドがスムーズに実施でき、その際発生する摩擦力を大幅に減少することができる。
可動ブロックのガイド部が記長穴の内壁面に面接触する断面形状とすることで、長穴に沿った可動ブロックの移動がスムーズに実施することができる。
上下構造のいずれか他方の側に弾性支承を配し、前記せん断拘束部材が前記弾性支承を貫通して配され、前記弾性支承に前記可動ブロックの他方の面が接するように配置することで、せん断拘束部材に伝達された橋軸直角方向の水平力を弾性支承のせん断変形により吸収でき、圧縮力に対しては可動ブロックの弾性支承の当接面積が大きく弾性支承が負担する支圧力を少なくすることができ弾性支承の平面形状を小さくすることができる。 A slot that is fixed to one side of the upper and lower structure side and extends in one direction, and a shear key that protrudes so as to surround the slot and engages with the inner wall of the recess formed on one side of the upper and lower structure formed, and one side slide plate and the slide surface, the shear restraint member to which the fixed at one end to the other side of the upper and lower structures through the long hole, and the slide surface of the slide plate on one side has a slide surface in contact, the guide portion of the inner wall surface contact to the cross-sectional shape of the slide plate and the long hole in the center of the abutting surface is protruded, the through-hole in which the shear restraining member is fitted the guide By providing a movable block formed in the part, it is possible to save the side block installation space because it corresponds to the horizontal force in the direction perpendicular to the bridge axis with the shear restraint member that penetrates the long hole of the slide plate, Self-arrangement of members It is possible to ensure a degree. At that time, the horizontal force in the direction perpendicular to the bridge axis from the superstructure is not directly applied to the shear restraint member, but is applied to the shear restraint member via the surface contact portion with the movable block fitted to the shear restraint member. Since it is transmitted evenly, stress is not concentrated on a part of the shearing restraint member, and the diameter of the shearing restraint member can be reduced. Moreover, it respond | corresponds with respect to the horizontal force of a bridge axis direction by the guide part of a movable block sliding along the long hole of a slide plate. At that time, the frictional force accompanying the slide is borne by the sliding surface of the movable block and the sliding plate smoothly sliding, and the load due to the frictional force of the shearing restraint member can be eliminated, extending the life of the shearing restraint member. Can be planned.
As the shear key that fits the key groove formed on one side of the top and bottom structure on the slide plate so as to surround the periphery of the long hole, the shear key acts as a shear key for horizontal force perpendicular to the bridge axis It functions and can prevent dust from entering the slot.
By arranging a low friction material on the slide surface of the slide plate, the slide plate and the movable block can be smoothly slid against the horizontal force in the bridge axis direction, and the friction force generated at that time can be greatly reduced. .
By making the guide portion of the movable block have a cross-sectional shape in surface contact with the inner wall surface of the elongated hole, the movable block can be smoothly moved along the elongated hole.
By disposing an elastic bearing on either side of the upper and lower structures, the shear restraining member is disposed through the elastic bearing, and arranged so that the other surface of the movable block is in contact with the elastic bearing, The horizontal force in the direction perpendicular to the bridge axis transmitted to the shear restraint member can be absorbed by the shear deformation of the elastic bearing, and the contact area of the elastic bearing of the movable block is large for the compressive force, and the bearing pressure borne by the elastic bearing is reduced. The planar shape of the elastic bearing can be reduced.

本発明の実施形態を示す図である。It is a figure which shows embodiment of this invention. （ａ）（ｂ）本発明の実施形態を示す図である。(A) (b) It is a figure which shows embodiment of this invention. （ａ）（ｂ）本発明の実施形態を示す図である。(A) (b) It is a figure which shows embodiment of this invention. （ａ）（ｂ）本発明の実施形態を示す図である。(A) (b) It is a figure which shows embodiment of this invention. （ａ）（ｂ）本発明の実施形態を示す図である。(A) (b) It is a figure which shows embodiment of this invention. （ａ）（ｂ）本発明の実施形態を示す図である。(A) (b) It is a figure which shows embodiment of this invention. （ａ）（ｂ）本発明の実施形態を示す図である。(A) (b) It is a figure which shows embodiment of this invention.

本発明の実施の形態を図により説明する。図１は、本発明の橋梁用一方向可動支承装置の一実施形態を示す図である。   Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing an embodiment of a unidirectional movable bearing device for a bridge according to the present invention.

橋梁用一方向可動支承装置１は、橋脚等のコンクリート製の下部構造２と鋼桁からなる上部構造３の間に設置される。下部構造２に埋設されたアンカーボルト５にカプラー１１を介してベースプレート４が固定される。   The one-way movable bearing device 1 for a bridge is installed between a concrete lower structure 2 such as a pier and an upper structure 3 made of a steel girder. A base plate 4 is fixed to an anchor bolt 5 embedded in the lower structure 2 via a coupler 11.

ベースプレート４上には弾性支承６が一体に固定される。ベースプレート４に一端を固定されたせん断拘束部材７が、弾性支承６を貫通して上方に垂直に立設される。せん断拘束部材７のベースプレート４への固定は、螺着又は溶接等により行う。   An elastic support 6 is integrally fixed on the base plate 4. A shear restraining member 7 having one end fixed to the base plate 4 passes through the elastic bearing 6 and stands vertically upward. The shear restraining member 7 is fixed to the base plate 4 by screwing or welding.

弾性支承６上にせん断拘束部材７に対して上下動可能に嵌挿する貫通穴８ａを形成した平板状の可動ブロック８が設置される。可動ブロック８の上面にせん断拘束部材用貫通穴８ａが形成されたガイド部８ｂが突設される。   A flat plate-like movable block 8 having a through hole 8a that is fitted on the elastic bearing 6 so as to be movable up and down with respect to the shear restraining member 7 is installed. A guide portion 8 b in which a through hole 8 a for shear restraining member is formed on the upper surface of the movable block 8 is projected.

一方、鋼桁からなる上部構造３に予め溶接により固定されソールプレート１０に、スライド板９が、複数のセットボルト１２を介して上部構造３に固定される。スライド板９の下面と可動ブロック８の上面とが橋軸方向のスライド面を形成する。   On the other hand, the upper structure 3 made of steel girders is fixed in advance to the sole plate 10 by welding and the slide plate 9 is fixed to the upper structure 3 via a plurality of set bolts 12. The lower surface of the slide plate 9 and the upper surface of the movable block 8 form a slide surface in the bridge axis direction.

図２（ａ）（ｂ）は、ベースプレート４の平面図とＡ−Ａ線切断面図である。ベースプレート４は、鋼製の部材でそのコーナ部に下部構造に埋設さてアンカーボルト５と螺着するためのカプラー１１を挿通するための固定用貫通穴４ａが形成される。ベースプレート４の中央部から垂直に上方に伸びるせん断拘束部材７の一端をベースプレート４に形成した雌ねじ穴に螺着して固定される。せん断拘束部材７のベースプレート４への固定は溶接によっても良い。   2A and 2B are a plan view of the base plate 4 and a sectional view taken along line AA. The base plate 4 is a steel member, and is formed with a fixing through hole 4a through which a coupler 11 is embedded in a lower portion of the base plate and is screwed to the anchor bolt 5. One end of a shear restraint member 7 extending vertically upward from the center of the base plate 4 is fixed by being screwed into a female screw hole formed in the base plate 4. The shear restraining member 7 may be fixed to the base plate 4 by welding.

ベースプレート４上にせん断拘束部材７が貫通する弾性支承６が設置される。図５は、弾性支承６の断面図である。弾性支承６は、ゴム６ａと補強鋼板６ｂを鉛直方向に複数積層した積層ゴムで構成される。積層ゴムの上下に上下連結鋼板６ｃ、６ｄが配置される。積層ゴムと上下連結鋼板６ｃ、６ｄは加硫一体成形により一体化される。下連結鋼板６ｄを省略しベースプレート４に直接積層ゴムを設置し、加硫一体成形によりベースプレート４と積層ゴムを一体化しても良い。積層ゴムと上下連結鋼板６ｃ、６ｄを貫通するせん断拘束部材７を嵌合するせん断拘束部材用貫通穴６ｅが形成される。   An elastic bearing 6 through which the shear restraining member 7 passes is installed on the base plate 4. FIG. 5 is a cross-sectional view of the elastic bearing 6. The elastic bearing 6 is composed of a laminated rubber in which a plurality of rubbers 6a and reinforcing steel plates 6b are laminated in the vertical direction. Upper and lower connecting steel plates 6c and 6d are disposed above and below the laminated rubber. The laminated rubber and the upper and lower connecting steel plates 6c and 6d are integrated by vulcanization integral molding. The lower connecting steel plate 6d may be omitted, and the laminated rubber may be installed directly on the base plate 4, and the base plate 4 and the laminated rubber may be integrated by vulcanization integral molding. A through hole 6e for a shear restraint member that fits the laminated rubber and the shear restraint member 7 penetrating the upper and lower connecting steel plates 6c and 6d is formed.

図３（ａ）（ｂ）は、可動ブロック８の平面図とＢ−Ｂ線切断面図である。可動ブロック８は平板状の部材で上面に４フッ化エチレン等の低摩擦材８ｃを設置する。可動ブロック８の上面中央から上方に伸びる断面矩形のガイド部８ｂが突設される。可動ブロック８の下面からガイド部８ｂの先端まで貫通するせん断拘束部材７を嵌合するせん断拘束部材用貫通穴８ａが形成される。   3A and 3B are a plan view of the movable block 8 and a sectional view taken along line BB. The movable block 8 is a flat plate member and a low friction material 8c such as tetrafluoroethylene is installed on the upper surface. A guide portion 8b having a rectangular cross section extending upward from the center of the upper surface of the movable block 8 is provided. A through hole 8a for a shear restraint member that fits the shear restraint member 7 penetrating from the lower surface of the movable block 8 to the tip of the guide portion 8b is formed.

図４（ａ）（ｂ）は、スライド板９の平面図とＣ−Ｃ線切断面図である。スライド板９の下面は可動ブロック８の上面と橋軸方向のスライド面を形成するため摩擦係数の小さいステンレススチール製とするのが望ましい。スライド板９のコーナ部には、上部構造３と固定のためのセットボルト１２を螺着するためのセットボルト用雌ねじ穴９ａが形成される。スライド板の中央部には橋軸方向に伸びる長穴９ｂが形成される。長穴９ｂの橋軸直角方向の幅と可動ブロック８のガイド部８ｂの橋軸直角方向の幅をほぼ同じとし、断面矩形のガイド部８ｂの側壁と長穴９ｂの内壁面が面接触する。可動ブロック８のガイド部８ｂの高さは、スライド板８の上面からわずかに突出する高さとする。長穴９ｂの周囲を取り囲むように連続したせん断キー９ｃを所定高さで突設する。   4A and 4B are a plan view of the slide plate 9 and a sectional view taken along the line CC. The lower surface of the slide plate 9 is preferably made of stainless steel having a small friction coefficient in order to form the upper surface of the movable block 8 and the slide surface in the bridge axis direction. In the corner portion of the slide plate 9, a female screw hole 9a for a set bolt for screwing the set bolt 12 for fixing to the upper structure 3 is formed. A long hole 9b extending in the bridge axis direction is formed at the center of the slide plate. The width of the long hole 9b in the direction perpendicular to the bridge axis and the width of the guide portion 8b in the movable block 8 in the direction perpendicular to the bridge axis are made substantially the same. The height of the guide portion 8 b of the movable block 8 is a height that slightly protrudes from the upper surface of the slide plate 8. A continuous shear key 9c is projected at a predetermined height so as to surround the periphery of the long hole 9b.

可動ブロック８の貫通穴８ａの嵌挿されたせん断拘束部材７の先端部は、ガイド部８ｂの上端面及びスライド板９の表面より上部に突き出すようにする。図６（ａ）（ｂ）は、上楊力阻止部材１３の平面図とＥ−Ｅ線切断面図である。上楊力阻止部材１３は、長穴９ｂの橋軸直角方向の幅より大きな外径を有し、せん断拘束部材７の上端部に形成した雄ねじ部と螺着のための雌ねじ穴１３ａが形成される。上楊力阻止部材１３の下面はガイド部８ｂの上端面と接する位置にするのが望ましい。上楊力阻止部材１３のせん断拘束部材７への固定は螺着でなく溶接により固定しても良い。   The distal end portion of the shear restraining member 7 into which the through hole 8a of the movable block 8 is inserted is projected above the upper end surface of the guide portion 8b and the surface of the slide plate 9. 6A and 6B are a plan view of the upper repelling force preventing member 13 and a sectional view taken along the line EE. The upper repulsion force blocking member 13 has an outer diameter larger than the width of the elongated hole 9b in the direction perpendicular to the bridge axis, and is formed with a male screw portion formed at the upper end portion of the shear restraining member 7 and a female screw hole 13a for screwing. The It is desirable that the lower surface of the upper repulsion force preventing member 13 is in a position in contact with the upper end surface of the guide portion 8b. The upper repelling force blocking member 13 may be fixed to the shear restraining member 7 by welding instead of screwing.

図５（ａ）（ｂ）は、上部構造３に予め溶接で固定されるソールプレート１０の平面図とＤ−Ｄ線切断面図である。ソールプレート１０のコーナ部にはスライド板９を上部構造３に固定するためのセットボルト挿入穴１０ａが形成される。ソールプレート１０の下面には、上楊力阻止部材の外径より若干大きい幅で、長さがスライド板９の長穴とほぼ同じ長さで、上楊力阻止部材１３の上端面より上の位置になる深さを有する凹部１０ｂを形成する。凹部１０ｂの内壁にせん断キー９ｃが嵌合する。   5A and 5B are a plan view and a sectional view taken along line D-D of the sole plate 10 fixed to the upper structure 3 by welding in advance. A set bolt insertion hole 10 a for fixing the slide plate 9 to the upper structure 3 is formed in a corner portion of the sole plate 10. The lower surface of the sole plate 10 has a width slightly larger than the outer diameter of the upper repulsion force blocking member and a length substantially the same as the long hole of the slide plate 9 and is higher than the upper end surface of the upper repulsion force blocking member 13. A recess 10b having a depth to be positioned is formed. A shear key 9c is fitted into the inner wall of the recess 10b.

図７（ａ）（ｂ）（ｃ）は、可動ブロック８、スライド板９をソールプレート１０に組み込んだ状態を示す平面図とＥ−Ｅ線切断面図とＦ−Ｆ線切断面図である。   FIGS. 7A, 7B, and 7C are a plan view, an EE line cut surface view, and an FF line cut surface view showing a state in which the movable block 8 and the slide plate 9 are incorporated in the sole plate 10, respectively. .

本発明の実施形態の橋梁用一方向可動支承装置１の作用について図７により説明する。先ず、上部構造３の橋軸方向の水平力に対しては、上部構造３に固定されたスライド板９が、その橋軸方向（Ｘ−Ｘ）に形成した長穴９ｂの内壁面と面接触する可動ブロック８のガイド部８ｂ両側部をガイドとして、スライド板９の下面と可動ブロック８の上面をスライド面として橋軸方向にスライドすることにより吸収する。可動ブロック８の上面には低摩擦材８ｃが設置され、スライド板９は摩擦係数の小さいステンレススチール製としているため小さな摩擦でスライドすることが可能となる。   The operation of the unidirectional movable bearing device 1 for bridges according to the embodiment of the present invention will be described with reference to FIG. First, with respect to the horizontal force in the bridge axis direction of the upper structure 3, the slide plate 9 fixed to the upper structure 3 is in surface contact with the inner wall surface of the long hole 9b formed in the bridge axis direction (XX). The movable block 8 is absorbed by sliding both sides of the guide portion 8b of the movable block 8 as guides, and sliding in the bridge axis direction using the lower surface of the slide plate 9 and the upper surface of the movable block 8 as slide surfaces. A low friction material 8c is installed on the upper surface of the movable block 8, and the slide plate 9 is made of stainless steel having a small friction coefficient, so that it can slide with small friction.

上部構造３の橋軸方向と直角方向（Ｙ−Ｙ）の水平力に対しては、ソールプレート１０とスライド板９を固定するセットボルト１２と、ソールプレート１０の凹部１０ｂの内壁とスライド板９のせん断キー９ｃとの係合部を介して水平力がスライド板１１に伝達される。スライド板９に伝達された水平力は、スライド板１１の長穴１４の内壁面と可動ブロック８のガイド部８ｂとの面接触した当接部から可動ブロック８に伝達される。可動ブロック８に伝達された水平力はせん断拘束部材７伝達される。上部構造３の橋軸直角方向の水平力は、直接せん断拘束部材９に伝達されるのではなく、せん断拘束部材９に嵌合した可動ブロック１８との面接触部を介してせん断拘束部材７に伝達される。そのため、橋軸直角方向の水平力によりせん断拘束部材７の一部に応力が集中することがなく、せん断拘束部材７の径を小径化することができる。   With respect to the horizontal force in the direction perpendicular to the bridge axis direction of the superstructure 3 (YY), the set bolt 12 that fixes the sole plate 10 and the slide plate 9, the inner wall of the recess 10 b of the sole plate 10, and the slide plate 9 The horizontal force is transmitted to the slide plate 11 through the engaging portion with the shear key 9c. The horizontal force transmitted to the slide plate 9 is transmitted to the movable block 8 from a contact portion where the inner wall surface of the long hole 14 of the slide plate 11 and the guide portion 8b of the movable block 8 are in surface contact. The horizontal force transmitted to the movable block 8 is transmitted to the shear restraint member 7. The horizontal force in the direction perpendicular to the bridge axis of the superstructure 3 is not directly transmitted to the shear restraint member 9 but is applied to the shear restraint member 7 via the surface contact portion with the movable block 18 fitted to the shear restraint member 9. Communicated. Therefore, the stress is not concentrated on a part of the shear restraining member 7 due to the horizontal force perpendicular to the bridge axis, and the diameter of the shear restraining member 7 can be reduced.

上部構造３の上揚力に対しては、せん断拘束部材７に上下動可能に嵌挿された可動ブロック８が上部構造３の上昇により一緒に上昇し、可動ブロック８のガイド部８ｂが上楊力阻止部材１３により上方向の移動を阻止され、可動ブロック８の上面とスライド板９の下面との面接触部により上揚力に対応する。   With respect to the lifting force of the upper structure 3, the movable block 8 fitted and inserted in the shear restraining member 7 so as to move up and down rises together as the upper structure 3 rises, and the guide portion 8 b of the movable block 8 moves upward. The upward movement is blocked by the blocking member 13 and corresponds to the upward lifting force by the surface contact portion between the upper surface of the movable block 8 and the lower surface of the slide plate 9.

スライド板９の長穴９ｂの上方は長穴９ｂの周囲がせん断キー９ｃと凹部１０ｂの内壁との係合により外部と遮断され、長穴９bの下側は可動ブロック８の上面により外部と遮断されるので長穴９ｂからの塵埃の浸入を阻止することが可能となる。   Above the long hole 9 b of the slide plate 9, the periphery of the long hole 9 b is blocked from the outside by engagement of the shear key 9 c and the inner wall of the recess 10 b, and the lower side of the long hole 9 b is blocked from the outside by the upper surface of the movable block 8. Therefore, it is possible to prevent the intrusion of dust from the long hole 9b.

この実施形態では、上部構造３を鋼桁としたが、上部構造３がコンクリート製桁の場合、コンクリート製桁に埋設したアンカーバーとソールプレート１０を溶接により固定し、スライド板９とソールプレート１０をスライド板９側からセットボルト１２で固定しても良い。上部構造３が鋼桁の場合でもコンクリート製桁の場合も、弾性支承６を上部構造３に固定し、スライド板９を下部構造２に固定しても良い。   In this embodiment, the upper structure 3 is a steel girder. However, when the upper structure 3 is a concrete girder, the anchor bar and the sole plate 10 embedded in the concrete girder are fixed by welding, and the slide plate 9 and the sole plate 10 are fixed. May be fixed with a set bolt 12 from the slide plate 9 side. Whether the upper structure 3 is a steel girder or a concrete girder, the elastic bearing 6 may be fixed to the upper structure 3 and the slide plate 9 may be fixed to the lower structure 2.

以上のように本発明の橋梁用一方向可動支承装置１は、上部構造３の橋軸直角方向の水平力が、スライド板９の長穴９ｂと面接触する可動ブロック８のガイド部８ｂを貫通するせん断拘束部材９で対応するのでサイドブロックの設置スペースを節約することができる各種部材の配置の自由度を確保できる。その際、上部構造３からの橋軸直角方向の水平力は、直接せん断拘束部材７に負荷されるのではなく、せん断拘束部材７に嵌合した可動ブロック８のガイド部８ｂとの面接触部を介して伝達されるので、せん断拘束部材７に均等に負荷されるので、せん断拘束部材７の一部に応力が集中することがなく、せん断拘束部材７の径を小さくすることができる。また、橋軸方向の水平力に対しては、上部構造３に固定されたスライド板９が、その橋軸方向（Ｘ−Ｘ）に形成した長穴９ｂの内壁面と面接触する可動ブロック８のガイド部８ｂ両側部をガイドとして、スライド板９の下面と可動ブロック８の上面をスライド面として橋軸方向にスライドすることにより吸収する。可動ブロック８の上面には低摩擦材８ｃが設置され、スライド板９は摩擦係数の小さいステンレススチール製としているため小さな摩擦でスライドすることが可能となる。上部構造３の圧縮力に対しては、可動ブロック８の下面から弾性支承６に伝達され、弾性支承が圧縮変形して対応する。また、可動ブロック８と弾性支承６の支圧面積が大きいので弾性支承６の平面形状を小さくすることが可能となる。スライド板９の長穴９ｂの上方は長穴９ｂの周囲がせん断キー９ｃと凹部１０ｂの内壁との係合により外部と遮断され、長穴９bの下側は可動ブロック８の上面により外部と遮断されるので長穴９ｂからの塵埃の浸入を阻止することが可能となる。   As described above, in the unidirectional movable bearing device 1 for a bridge according to the present invention, the horizontal force in the direction perpendicular to the bridge axis of the upper structure 3 penetrates the guide portion 8b of the movable block 8 in surface contact with the long hole 9b of the slide plate 9. Since it corresponds by the shearing restraint member 9 to perform, the freedom of arrangement | positioning of the various members which can save the installation space of a side block is securable. At that time, the horizontal force in the direction perpendicular to the bridge axis from the upper structure 3 is not directly applied to the shear restraint member 7 but is a surface contact portion with the guide portion 8 b of the movable block 8 fitted to the shear restraint member 7. Since the load is evenly applied to the shear restraint member 7, stress is not concentrated on a part of the shear restraint member 7, and the diameter of the shear restraint member 7 can be reduced. For the horizontal force in the bridge axis direction, the movable block 8 in which the slide plate 9 fixed to the upper structure 3 comes into surface contact with the inner wall surface of the long hole 9b formed in the bridge axis direction (XX). This is absorbed by sliding in the direction of the bridge axis using both sides of the guide portion 8b as guides and the lower surface of the slide plate 9 and the upper surface of the movable block 8 as slide surfaces. A low friction material 8c is installed on the upper surface of the movable block 8, and the slide plate 9 is made of stainless steel having a small friction coefficient, so that it can slide with small friction. The compressive force of the upper structure 3 is transmitted from the lower surface of the movable block 8 to the elastic support 6, and the elastic support is compressed and deformed. Moreover, since the bearing area of the movable block 8 and the elastic bearing 6 is large, the planar shape of the elastic bearing 6 can be reduced. Above the long hole 9 b of the slide plate 9, the periphery of the long hole 9 b is blocked from the outside by engagement of the shear key 9 c and the inner wall of the recess 10 b, and the lower side of the long hole 9 b is blocked from the outside by the upper surface of the movable block 8. Therefore, it is possible to prevent the intrusion of dust from the long hole 9b.

１：橋梁用位置方向可動支承装置、２：下部構造、３：上部構造、４：ベースプレート、４ａ：固定用貫通穴、５：アンカーボルト、６：弾性支承、６ａ：ゴム、６ｂ：補強鋼板、６ｃ：上連結鋼板、６ｄ：下連結鋼板、６ｅ：せん断拘束部材用貫通穴、７：せん断拘束部材、８：可動ブロック、８ａ：せん断拘束部材用貫通穴、８ｂ：ガイド部、８ｃ：低摩擦材、９：スライド板、９ａ：セットボルト用雌ねじ穴、９ｂ：長穴、９ｃ：せん断キー、１０：ソールプレート、１０ａ：セットボルト挿入穴、１０ｂ：凹部、１１：カプラー、１２：セットボルト、１３：上楊力阻止部材、１３ａ：雌ねじ穴   1: Positional movable support device for bridge, 2: Lower structure, 3: Upper structure, 4: Base plate, 4a: Fixing through hole, 5: Anchor bolt, 6: Elastic support, 6a: Rubber, 6b: Reinforced steel plate, 6c: Upper connection steel plate, 6d: Lower connection steel plate, 6e: Through hole for shear restraint member, 7: Shear restraint member, 8: Movable block, 8a: Through hole for shear restraint member, 8b: Guide portion, 8c: Low friction Material: 9: Slide plate, 9a: Female screw hole for set bolt, 9b: Long hole, 9c: Shear key, 10: Sole plate, 10a: Set bolt insertion hole, 10b: Recess, 11: Coupler, 12: Set bolt, 13: Upper repulsion force blocking member, 13a: Female screw hole

Claims (3)

上下構造側の一方の側に固定され一方向に伸びる長穴と、前記長穴の周囲を取り囲むように突設し上下構造の一方の側に形成された凹部の内壁と係合するせん断キーを形成し、一方の面をスライド面としたスライド板と、
前記上下構造の他方の側に一端を固定され前記長穴を貫通するせん断拘束部材と、
一方の面に前記スライド板の前記スライド面と接するスライド面を有し、前記スライド板と当接する面の中央に前記長穴の内壁面と面接触する断面形状のガイド部が突設され、前記せん断拘束部材が嵌合する貫通穴を前記ガイド部に形成した可動ブロックと、
を備えることを特徴とする橋梁用一方向可動支承装置。 A slot that is fixed to one side of the upper and lower structure side and extends in one direction, and a shear key that protrudes so as to surround the slot and engages with the inner wall of the recess formed on one side of the upper and lower structure A slide plate formed with one surface as a slide surface;
A shear restraining member fixed at one end to the other side of the upper and lower structure and penetrating the elongated hole;
One surface has a slide surface in contact with the slide surface of the slide plate, and a cross-sectional guide portion in surface contact with the inner wall surface of the elongated hole protrudes from the center of the surface in contact with the slide plate, A movable block in which a through hole into which a shear restraining member is fitted is formed in the guide portion ;
A unidirectional movable bearing device for a bridge, characterized by comprising: 前記スライド板のスライド面に低摩擦材を配置することを特徴とする請求項１に記載の橋梁用一方向可動支承装置。   The one-way movable support device for a bridge according to claim 1, wherein a low friction material is disposed on a slide surface of the slide plate. 前記上下構造のいずれか他方の側に弾性支承を配し、前記せん断拘束部材が前記弾性支承を貫通して配され、前記弾性支承に前記可動ブロックの他方の面が接するように配置することを特徴とする請求項１又は２に記載の橋梁用一方向可動支承装置。 Arranging an elastic support to the other side of the vertical structure, said shear restraining member is disposed through said elastic bearing, arranged to the other surface of the movable block is in contact with the elastic bearing The unidirectional movable bearing device for bridges according to claim 1 or 2, characterized by the above-mentioned.
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