JP2009019488A - Elastic support and elastic support apparatus using the same - Google Patents

Elastic support and elastic support apparatus using the same Download PDF

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JP2009019488A
JP2009019488A JP2007328070A JP2007328070A JP2009019488A JP 2009019488 A JP2009019488 A JP 2009019488A JP 2007328070 A JP2007328070 A JP 2007328070A JP 2007328070 A JP2007328070 A JP 2007328070A JP 2009019488 A JP2009019488 A JP 2009019488A
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steel plate
elastic layer
elastic
radial direction
layer
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JP4377429B2 (en
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Kenji Tanaka
健司 田中
Takahiro Koizumi
貴宏 小泉
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BBM Co Ltd
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BBM Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide an elastic support and an elastic support apparatus using it, reducing distortion in the peripheral edge part of an elastic layer. <P>SOLUTION: In this elastic support, the elastic layer 4 is integrally fixed between an upper steel plate 2 and a lower steel plate 3 spaced from each other and opposite to each other. Flat surfaces 8, 9 are provided rather closer to the central part in the radial direction in the opposite surfaces of the upper steel plate 2 and the lower steel plate 3, the upper steel plate 2 and the lower steel plate 3 are respectively provided with annular grooves 10, 11 connected to the respective flat surfaces 8, 9 and separate the opposite surfaces of the upper steel plate 2 and the lower steel plate 3 from each other, and a stress relaxing layer is formed by the thick elastic layer 4 between the bottoms 12, 13 of the opposite annular grooves 10, 11. In the elastic support, the widths of the flat surfaces 8, 9 are set larger than the widths of the annular grooves 10, 11 in the radial direction. The bottoms of the opposite annular grooves 10, 11 are formed as inclined surface 17, 18 gradually separating rather closer to the radial outside, and the thick elastic layer 4 between the bottoms 12, 13 of the respective annular grooves 10, 11 is gradually increased in thickness as it radially goes toward the outside. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、橋梁，建築物等の各種構造物用弾性支承装置に用いられる弾性支承体およびそれを備えた弾性支承装置に関する。   The present invention relates to an elastic bearing body used for an elastic bearing device for various structures such as bridges and buildings, and an elastic bearing device including the elastic bearing body.

従来、図１２（ａ）（ｂ）に示すように、鋼製上鋼板３７と鋼製下鋼板３８との間にゴムのような弾性層３９とそのゴム層内に耐圧補強用の環状等の耐圧補強用鋼板４０を、加硫接着による一体成型により、埋め込み配置するようにした弾性層を備えた弾性支承体３６が知られている（例えば、特許文献１、２参照）。
前記の弾性支承体３６は、弾性支承体３６の外側にせん断変形拘束壁を設けたり、内側あるいは内蔵するようにせん断変形拘束用突起を設けて、前記弾性層３９のせん断変形を拘束するようにして使用され、弾性層３９に上部構造物からの上下の荷重および上部構造物の撓みによる微小回転を許容するように単純化し、高支圧荷重を負担可能にした弾性支承体である。
特開平１１−２３６９４４号公報 特開平２００４−３０８１０９号公報 Conventionally, as shown in FIGS. 12 (a) and 12 (b), an elastic layer 39 such as rubber is provided between a steel upper steel plate 37 and a steel lower steel plate 38, and a pressure-proof reinforcing ring or the like is provided in the rubber layer. There is known an elastic support body 36 having an elastic layer in which a pressure-proof reinforcing steel plate 40 is embedded and arranged by integral molding by vulcanization adhesion (see, for example, Patent Documents 1 and 2).
The elastic bearing member 36 is provided with a shear deformation restraining wall on the outer side of the elastic bearing member 36, or provided with a shear deformation restraining projection so as to be inside or built in, thereby restraining the shear deformation of the elastic layer 39. This is an elastic bearing body that is simplified so as to allow the elastic layer 39 to be finely rotated by upper and lower loads from the upper structure and bending of the upper structure, and to be able to bear a high bearing load.
JP 11-236944 A Japanese Patent Laid-Open No. 2004-308109

前記の弾性支承体３６の場合には、高支圧荷重下で使用した場合には、弾性層３９の周縁部が半径方向外側に膨出するときに、耐圧補強用鋼板４０の周縁部と弾性層３９周縁部との境界面に作用する剥離力が大きくなるため、耐圧補強鋼板４０周縁部と弾性層３９との付着界面が剥離する恐れがあるという問題があった。
なお、前記の弾性支承体の場合には、弾性層の厚みが半径方向でほぼ一定であるので、弾性層周縁部の局部応力が大きくなると共に歪が大きくなり、弾性層周縁部と、鋼製上鋼板および鋼製下鋼板との接着界面が剥離する恐れがあるため、鋼製上鋼板および鋼製下鋼板との接着界面を粗面にするなど複雑な構造にして対応すると、加工コストが高くなるという問題がある。
前記の問題を解決する手段として、耐圧補強鋼板４０を取り除くことについて検討したところ、より弾性層４０の厚みが薄くなる分、弾性層の半径方向外側よりの部分の局部応力が大きくなると共に歪が大きくなり、弾性層４０の半径方向外側よりの部分が変形しづらくなるので、桁の撓みに対する回転支承作用(回転性)が低下するという新たな問題が生じるようになった。
本発明は、前記の問題を有利に解決し、耐圧補強鋼板４０を使用しない場合でも、弾性層の半径方向外側よりの部分の局部応力を小さくすると共に歪を小さくして、桁の撓みに対する回転支承作用（回転性）を柔軟に許容する弾性支承体およびそのような弾性支承体を備えた弾性支承装置を提供することを主目的とする。
また、本発明は、前記の問題を有利に解決し、弾性層の周縁部の歪を低減した弾性支承体およびそれを備えた弾性支承装置を提供することを目的とする。 In the case of the elastic support body 36, when used under a high bearing load, when the peripheral edge of the elastic layer 39 bulges outward in the radial direction, the elastic peripheral body 36 is elastic with the peripheral edge of the pressure-proof reinforcing steel plate 40. Since the peeling force acting on the interface with the peripheral edge of the layer 39 is increased, there is a problem that the adhesion interface between the peripheral edge of the pressure-resistant reinforced steel sheet 40 and the elastic layer 39 may be peeled off.
In the case of the elastic support body described above, since the thickness of the elastic layer is substantially constant in the radial direction, the local stress at the peripheral edge of the elastic layer increases and the strain increases, and the peripheral edge of the elastic layer and the steel Since there is a risk that the bonding interface between the upper steel plate and the steel lower steel plate may be peeled off, processing with a complicated structure such as a roughened bonding interface between the steel upper steel plate and the steel lower steel plate will increase the processing cost. There is a problem of becoming.
As a means for solving the above problem, the removal of the pressure reinforced steel sheet 40 was examined. As the thickness of the elastic layer 40 becomes thinner, the local stress in the portion from the outside in the radial direction of the elastic layer becomes larger and the distortion is increased. As the size of the elastic layer 40 becomes larger and the portion of the elastic layer 40 from the outside in the radial direction becomes difficult to deform, there arises a new problem that the rotational support action (rotation) against the bending of the girder is lowered.
The present invention advantageously solves the above problem, and even when the pressure-proof reinforced steel sheet 40 is not used, the local stress in the portion from the radially outer side of the elastic layer is reduced and the strain is reduced, so that the rotation with respect to the bending of the girder is achieved. It is a main object of the present invention to provide an elastic bearing body that flexibly allows a bearing action (rotation) and an elastic bearing device including such an elastic bearing body.
Another object of the present invention is to advantageously solve the above-described problems and to provide an elastic bearing body in which the distortion of the peripheral edge portion of the elastic layer is reduced and an elastic bearing device including the elastic bearing body.

前記の課題を有利に解決するために、第１発明の弾性支承体では、間隔をおいて対向する上鋼板の下面と下鋼板の上面に環状溝が設けられ、前記上鋼板と下鋼板の間に弾性層が一体に固着され、半径方向中央部よりの弾性層の厚みよりも半径方向外側寄りに対向する前記環状溝間の弾性層の厚みが厚くされて、その外側よりの弾性層を中央部寄りの弾性層よりも歪みやすくして、桁の撓みに対する回転性を向上させたことを特徴とする。
第２発明では、第１発明の弾性支承体において、対向する前記環状溝間に固着された弾性層が応力緩和層として機能していることを特徴とする。
第３発明では、第１発明または第２発明の弾性支承体において、間隔をおいて対向する環状溝の底部が、半径方向外側に向かって離反するような傾斜面とされ、前記環状溝内に設けられている弾性層の厚みが半径方向外側に向かって厚くなるようにされていることを特徴とする。
第４発明では、間隔をおいて対向する上鋼板の下面と下鋼板の上面に環状段部が設けられ、前記上鋼板と下鋼板の間に弾性層が一体に固着され、半径方向中央部よりの弾性層の厚みよりも半径方向外側よりに対向する前記環状段部間の弾性層の厚みを厚くして、弾性層の中央部よりも外側よりの弾性層を歪みやすくして桁の撓みに対する回転性を向上させたことを特徴とする。
第５発明では、第４発明の弾性支承体において、対向する前記環状段部間に固着された弾性層が応力緩和層として機能していることを特徴とする。
第６発明では、第４発明または第５発明の弾性支承体において、対向する前記環状段部の底部が、半径方向外側に向かって離反するような傾斜面とされ、前記環状段部内に設けられている弾性層の厚みが半径方向外側に向かって厚くなるようにされていることを特徴とする。
第７発明では、第１発明〜第６発明のいずれかに記載の弾性支承体において、前記上鋼板または前記下鋼板のいずれか一方の鋼板の中央部にせん断変形拘束用突起が設けられ、そのせん断変形拘束用突起は他方の鋼板の中央部に設けた貫通孔に嵌合されていることを特徴とする。
第８発明の弾性支承装置においては、第１発明〜第７発明のいずれかの弾性支承体を備えていることを特徴とする。 In order to solve the above-mentioned problem advantageously, in the elastic bearing body of the first invention, an annular groove is provided on the lower surface of the upper steel plate and the upper surface of the lower steel plate facing each other at a distance, and between the upper steel plate and the lower steel plate. The elastic layer is integrally fixed to the outer circumferential groove, and the thickness of the elastic layer between the annular grooves opposed to the outer side in the radial direction is thicker than the thickness of the elastic layer from the central portion in the radial direction. It is characterized by being more easily distorted than the elastic layer near the portion and improving the rotational property against bending of the girder.
According to a second invention, in the elastic bearing body of the first invention, an elastic layer fixed between the annular grooves facing each other functions as a stress relaxation layer.
In the third invention, in the elastic bearing body of the first invention or the second invention, the bottoms of the annular grooves facing each other at an interval are inclined so as to be separated outward in the radial direction. The elastic layer is provided such that the thickness of the elastic layer increases toward the outside in the radial direction.
In the fourth invention, an annular step is provided on the lower surface of the upper steel plate and the upper surface of the lower steel plate facing each other at an interval, and an elastic layer is integrally fixed between the upper steel plate and the lower steel plate, The thickness of the elastic layer between the annular step portions opposed to the outer side in the radial direction is thicker than the thickness of the elastic layer, so that the elastic layer from the outer side than the central part of the elastic layer is easily distorted and the bending of the girder is prevented. It is characterized by improved rotation.
According to a fifth aspect, in the elastic bearing body according to the fourth aspect, the elastic layer fixed between the annular step portions facing each other functions as a stress relaxation layer.
According to a sixth invention, in the elastic bearing body of the fourth or fifth invention, the bottom portions of the opposed annular stepped portions are inclined surfaces that are separated outward in the radial direction, and are provided in the annular stepped portion. The elastic layer is configured such that the thickness of the elastic layer increases toward the outer side in the radial direction.
In the seventh invention, in the elastic bearing body according to any one of the first to sixth inventions, a shear deformation restraining projection is provided at a central portion of one of the upper steel plate and the lower steel plate, The shear deformation restraining protrusion is fitted in a through hole provided in the central portion of the other steel plate.
The elastic bearing device of the eighth invention is characterized by comprising the elastic bearing body of any one of the first to seventh inventions.

第１発明によると、間隔をおいて対向する上鋼板の下面と下鋼板の上面に環状溝が設けられ、前記上鋼板と下鋼板の間に弾性層が一体に固着され、半径方向中央部よりの弾性層の厚みよりも半径方向外側寄りに対向する前記環状溝間の弾性層の厚みが厚くされて、その外側よりの弾性層を中央部寄りの弾性層よりも歪みやすくしているので、桁の撓みに対する回転性を向上させることができる。
第２発明によると、弾性層における半径方向外周側よりの環状溝間の部分が、中央側よりの平坦面間よりも肉厚の厚い厚肉部とされているので、上部構造物を弾性的に支持している状態では、上鋼板または下鋼板から受ける荷重による弾性層の歪のうち、半径方向中央側よりの平坦面間の歪よりも、半径方向外周側よりの環状溝間の部分の歪を小さくすることができると共に、弾性層周縁部の局部応力を緩和することができ、そのため、上鋼板および下鋼板と弾性層の外周側より部分との接着界面に作用する剥離力を低減することができ、弾性支承体の耐久性を向上させることができる効果が得られる。
また、環状溝における外周側の縦方向の壁面により、上鋼板または下鋼板における半径方向外側に向かう剥離力に対して抵抗することができる。
また、第４発明によると、間隔をおいて対向する上鋼板の下面と下鋼板の上面に環状段部が設けられ、前記上鋼板と下鋼板の間に弾性層が一体に固着され、半径方向中央部よりの弾性層の厚みよりも半径方向外側よりに対向する前記環状段部間の弾性層の厚みを厚くして、弾性層の中央部よりも外側よりの弾性層を歪みやすくしているので、桁の撓みに対する回転性を向上させることができる。
第５発明によると、弾性層における半径方向外周側よりの環状段部間の部分が、中央側より平坦面間よりも厚肉の厚い厚肉部とされているので、上部構造物を弾性的に支持している状態では、上鋼板または下鋼板から受ける荷重による弾性層の歪のうち、半径方向中央側よりの平坦面間の歪よりも、半径方向外周側よりの環状段部間の部分の歪を小さくすることができると共に、弾性層周縁部の局部応力を緩和することができ、そのため、上鋼板および下鋼板と弾性層の外周側より部分との接着界面に作用する剥離力を低減することができ、弾性支承体の耐久性を向上させることができる効果が得られる。
また、第３発明または第６発明によると、半径方向において、環状溝内または段部内の底部は半径方向外側に向かって離反するような傾斜面とされ、環状溝内または段部内に設けられている弾性層は半径方向外側に向かって漸次弾性層が厚くされているので、確実に半径方向外側に向かって応力および歪を緩和することができ、そのため、弾性層周縁部の局部応力を緩和することができ、また桁の撓みに対して弾性支承体の半径方向外側よりを歪みやすくしての桁の撓みに対する回転支承作用（回転性）を一層容易にすることができる。
また、第３発明または第６発明によると、対向する環状溝または環状段部の半径方向外側において、上鋼板と下鋼板との対向面は半径方向外側に向かって漸次離反するような傾斜面とされているので、傾斜面間により半径方向外側に向かって広がる領域を形成することができ、そのため、圧縮荷重等を受けた弾性層の逃げ変形領域を容易に形成できると共に、この部分に膨出した場合の弾性層の局部応力および歪を緩和することができる。
また、第７発明によると、上鋼板の中央部または下鋼板の中央部のいずれか一方に他方の鋼板に向かって突出するせん断変形拘束用突起を設けられ、前記せん断変形拘束用突起を他方の鋼板に嵌合されているので、弾性層のせん断変形を容易に拘束することができる。
また、第８発明によると、第１発明から第９発明のいずれかの効果のある弾性支承装置とすることができる。 According to the first invention, annular grooves are provided on the lower surface of the upper steel plate and the upper surface of the lower steel plate facing each other at an interval, and the elastic layer is integrally fixed between the upper steel plate and the lower steel plate. Since the thickness of the elastic layer between the annular grooves facing the outer side in the radial direction than the thickness of the elastic layer is thickened, the elastic layer from the outer side is more easily distorted than the elastic layer near the center, It is possible to improve the rotational performance against the bending of the girders.
According to the second invention, since the portion between the annular grooves from the radially outer peripheral side in the elastic layer is a thick portion thicker than between the flat surfaces from the central side, the upper structure is made elastic. Of the elastic layer due to the load received from the upper steel plate or the lower steel plate, the strain between the annular grooves from the radially outer side is larger than the strain between the flat surfaces from the radial center side. The strain can be reduced and the local stress at the peripheral edge of the elastic layer can be relieved, so that the peeling force acting on the bonding interface between the upper steel plate and the lower steel plate and the outer peripheral side of the elastic layer is reduced. The durability of the elastic bearing body can be improved.
Moreover, it can resist with respect to the peeling force which goes to the radial direction outer side in an upper steel plate or a lower steel plate with the wall surface of the outer peripheral side in an annular groove.
Further, according to the fourth invention, the annular step is provided on the lower surface of the upper steel plate and the upper surface of the lower steel plate facing each other at an interval, and the elastic layer is integrally fixed between the upper steel plate and the lower steel plate, and the radial direction By increasing the thickness of the elastic layer between the annular stepped portions opposed to the outer side in the radial direction than the thickness of the elastic layer from the central portion, the elastic layer from the outer side than the central portion of the elastic layer is easily distorted. Therefore, the rotation property with respect to bending of the girder can be improved.
According to the fifth invention, the portion between the annular step portions from the radially outer peripheral side in the elastic layer is a thick portion thicker than the flat surface from the central side, so that the upper structure is elastic Of the elastic layer due to the load received from the upper steel plate or the lower steel plate, the portion between the annular step portions from the outer peripheral side in the radial direction is more than the strain between the flat surfaces from the radial center side. The strain on the elastic layer can be reduced, and the local stress at the peripheral edge of the elastic layer can be relaxed. Therefore, the peeling force acting on the bonding interface between the upper and lower steel plates and the outer peripheral side of the elastic layer is reduced. The durability of the elastic support can be improved.
According to the third or sixth aspect of the invention, in the radial direction, the bottom of the annular groove or the stepped portion is inclined so as to be separated outward in the radial direction, and is provided in the annular groove or the stepped portion. Since the elastic layer is gradually thickened toward the outer side in the radial direction, the stress and strain can be surely reduced toward the outer side in the radial direction, and therefore, the local stress at the peripheral edge of the elastic layer is reduced. In addition, it is possible to further facilitate the rotational support action (rotation) against the bending of the girder by making it easier to distort the outer side in the radial direction of the elastic bearing body with respect to the bending of the girder.
Further, according to the third or sixth invention, on the radially outer side of the opposed annular grooves or annular stepped portions, the opposed surfaces of the upper steel plate and the lower steel plate are inclined surfaces that gradually separate toward the radially outer side. As a result, it is possible to form a region extending radially outwardly between the inclined surfaces, so that a relief deformation region of the elastic layer subjected to a compressive load or the like can be easily formed and bulges in this portion. In this case, the local stress and strain of the elastic layer can be relaxed.
According to the seventh invention, either one of the central portion of the upper steel plate or the central portion of the lower steel plate is provided with a shear deformation restraining projection that projects toward the other steel plate, and the shear deformation restraining projection is provided on the other steel plate. Since it is fitted to the steel plate, the shear deformation of the elastic layer can be easily restrained.
Further, according to the eighth invention, an elastic bearing device having any of the effects of the first invention to the ninth invention can be obtained.

次に、本発明を図示の実施形態に基づいて詳細に説明する。   Next, the present invention will be described in detail based on the illustrated embodiment.

図１および図２には、本発明の第１実施形態の弾性支承体１Ａが示されている。   1 and 2 show an elastic support 1A according to a first embodiment of the present invention.

本発明の弾性支承体は、間隔をおいて対向する上鋼板２と下鋼板３との間に弾性層４を一体に固着した弾性支承体であり、上鋼板２と下鋼板３の平面形態は、矩形、円形等適宜の形態とされ、この第１実施形態の弾性支承体１Ａは、下鋼板３の中央部に雌ねじ孔が設けられ、その雌ねじ孔に、上鋼板２に向かって突出する円柱状のせん断変形拘束用突起５の下部雄ねじ軸部がねじ込み固定され、前記せん断変形拘束用突起５は上鋼板２の中央部孔に貫通するように嵌合されている。   The elastic bearing body of the present invention is an elastic bearing body in which an elastic layer 4 is integrally fixed between an upper steel plate 2 and a lower steel plate 3 which are opposed to each other at an interval. The elastic bearing body 1A according to the first embodiment has a female screw hole provided in the center of the lower steel plate 3, and a circle protruding toward the upper steel plate 2 in the female screw hole. The lower male screw shaft portion of the columnar shear deformation restraining projection 5 is screwed and fixed, and the shear deformation restraining projection 5 is fitted through the central hole of the upper steel plate 2.

前記せん断変形拘束用突起５には、その上部に雄ねじ部６が設けられ、桁等の上部構造物７に連結可能に構成されている。前記のせん断変形拘束用突起５と上鋼板２との中央孔との間には、適宜、微小間隙を設けて、桁の微小回転に対応可能にされている。   The shear deformation restraining projection 5 is provided with a male screw portion 6 on the upper portion thereof, and is configured to be connectable to an upper structure 7 such as a girder. A small gap is appropriately provided between the shear deformation restraining projection 5 and the central hole of the upper steel plate 2 so as to cope with minute rotation of the girders.

本発明における弾性支承体１Ａ（１）では、間隔をおいて対向する上鋼板２と下鋼板３との間に弾性層４を一体に加硫成形により固着され、上鋼板２と下鋼板３との対向面における半径方向中央部よりにそれぞれ環状の平坦面８，９が設けられ、前記各平坦面８，９に接続すると共に、上鋼板２と下鋼板３との対向面が離れるような環状溝１０，１１がそれぞれ上鋼板２と下鋼板３とに設けられ、対向する前記各環状溝１０，１１の底部１２，１３間の厚肉弾性層４（４Ａ）により応力緩和層が形成されている。また、換言すると、前記環状溝１０，１１内に設けられている弾性層は、仮に環状溝１０，１１がないとした場合の薄肉弾性層の単位厚さあたりの歪みを小さくする作用および上鋼板２および下鋼板３と弾性層４の接着界面の部分Ａ、Ｂに作用する剥離応力が緩和する応力緩和部として機能している。   In the elastic support body 1A (1) in the present invention, the elastic layer 4 is integrally fixed by vulcanization between the upper steel plate 2 and the lower steel plate 3 which are opposed to each other at an interval. Annular flat surfaces 8 and 9 are respectively provided from the radial center portions of the opposing surfaces of the steel plates, and are connected to the flat surfaces 8 and 9, respectively, and the opposing surfaces of the upper steel plate 2 and the lower steel plate 3 are separated from each other. Grooves 10 and 11 are provided in the upper steel plate 2 and the lower steel plate 3, respectively, and a stress relaxation layer is formed by the thick elastic layer 4 (4A) between the bottom portions 12 and 13 of the opposed annular grooves 10 and 11, respectively. Yes. In other words, the elastic layer provided in the annular grooves 10 and 11 has an effect of reducing the strain per unit thickness of the thin elastic layer and the upper steel plate if the annular grooves 10 and 11 are not provided. 2 and the lower steel plate 3 and the elastic layer 4 function as a stress relaxation portion that relaxes the peeling stress acting on the portions A and B of the adhesion interface.

前記の環状溝１０，１１の断面形状としては、図示の形態のように鉛直な内径側の縦壁と溝底部と鉛直な外径側の縦壁とからなるような凹状溝以外にも、長円形状の溝としてもよいが、外径側の縦壁１４は、剥離抵抗を発揮する上では、鉛直な縦壁であるのが望ましい。   As the cross-sectional shape of the annular grooves 10, 11, in addition to the concave groove formed of a vertical wall on the vertical inner diameter side, a groove bottom, and a vertical wall on the outer diameter side as shown in the figure, Although it may be a circular groove, the vertical wall 14 on the outer diameter side is preferably a vertical vertical wall in order to exert a peeling resistance.

前記のように、本発明の弾性支承体１Ａでは、平坦面８，９間の弾性層４の厚みは薄肉弾性層４Ｂとされ、鉛直荷重が作用した場合、この薄肉弾性層４Ｂの部分で、高支圧で支承され、半径方向外側に接続する厚肉弾性層４Ａが設けられているので、この部分の弾性層の単位厚さ当りの歪は、薄肉部に比べて小さくなり、上鋼板２および下鋼板３と弾性層４の接着界面の部分Ａ、Ｂに作用する剥離応力が緩和されるようにされている。   As described above, in the elastic support 1A of the present invention, the thickness of the elastic layer 4 between the flat surfaces 8 and 9 is the thin elastic layer 4B, and when a vertical load is applied, the thin elastic layer 4B is Since the thick elastic layer 4A that is supported at a high bearing pressure and is connected to the outer side in the radial direction is provided, the strain per unit thickness of the elastic layer in this portion is smaller than that in the thin portion, and the upper steel plate 2 And the peeling stress which acts on the parts A and B of the adhesion interface between the lower steel plate 3 and the elastic layer 4 is relaxed.

また、前記の環状溝１０，１１は、半径方向中心よりの縦壁面１０Ａ，１１Ａと、平坦な溝底部１２，１３と、半径方向外側の縦壁面１４とを備えており、前記外側の縦壁面１４は、鉛直荷重等が弾性支承体１Ａに作用した場合に、溝底部１２，１３等を含む上鋼板２と下鋼板３と弾性層４との加硫接着界面Ａ、Ｂ（特に、弾性層４における側部溝１６付近外周側）に水平方向の剥離力が作用した場合に、これに抵抗し、前記の溝底部１２，１３と弾性層４とが剥離するのを防止するようにされている。   The annular grooves 10 and 11 include vertical wall surfaces 10A and 11A from the center in the radial direction, flat groove bottom portions 12 and 13, and a vertical wall surface 14 on the outer side in the radial direction. 14 is a vulcanization adhesion interface A, B between the upper steel plate 2, the lower steel plate 3, and the elastic layer 4 including the groove bottom portions 12, 13 and the like when the vertical load or the like acts on the elastic support 1A (particularly, the elastic layer When the horizontal peeling force acts on the outer peripheral side in the vicinity of the side groove 16 in FIG. 4, it resists this and prevents the groove bottoms 12 and 13 and the elastic layer 4 from peeling off. Yes.

本発明の実施形態においては、せん断変形拘束用突起５の半径方向外側に隣接するように、上鋼板２および下鋼板３に各平坦面８，９が設けられている。   In the embodiment of the present invention, the flat surfaces 8 and 9 are provided on the upper steel plate 2 and the lower steel plate 3 so as to be adjacent to the outer side in the radial direction of the shear deformation restraining projection 5.

なお、本発明においては、上鋼板２の中央部または下鋼板３の中央部のいずれか一方に他方の鋼板に向かって突出するせん断変形拘束用突起５を設け、前記せん断変形拘束用突起５を他方の鋼板に嵌合されていればよい。   In the present invention, either one of the central portion of the upper steel plate 2 or the central portion of the lower steel plate 3 is provided with a shear deformation restraining projection 5 projecting toward the other steel plate, and the shear deformation restraining projection 5 is provided. It only needs to be fitted to the other steel plate.

弾性層４における半径方向外周側よりの環状溝底部１２，１３間の部分が、中央側よりの平坦面８，９間よりも肉厚の厚い厚肉部とされているので、上部構造物７を弾性的に支持している状態では、上鋼板２または下鋼板３から受ける荷重による弾性層４の歪のうち、半径方向中央側よりの平坦面８，９間の歪よりも、半径方向外周側よりの環状溝底部１２，１３間の部分の歪を小さくすることができると共に、弾性層周縁部の局部応力を緩和することができ、そのため、上鋼板２および下鋼板３と弾性層４の外周側より部分との接着界面に作用する剥離力を低減することができ、弾性支承体１Ａの耐久性を向上させることができる効果が得られる。   Since the portion between the annular groove bottom portions 12 and 13 from the radially outer peripheral side in the elastic layer 4 is a thick portion thicker than between the flat surfaces 8 and 9 from the central side, the upper structure 7 Is elastically supported in the elastic layer 4 due to the load received from the upper steel plate 2 or the lower steel plate 3, the outer circumference in the radial direction is more than the strain between the flat surfaces 8 and 9 from the radial center side. The strain at the portion between the annular groove bottom portions 12 and 13 from the side can be reduced, and the local stress at the peripheral portion of the elastic layer can be relieved, so that the upper steel plate 2 and the lower steel plate 3 and the elastic layer 4 The peeling force acting on the adhesion interface with the part from the outer peripheral side can be reduced, and the effect of improving the durability of the elastic support 1A can be obtained.

実施形態の共通の構成として、弾性支承体１Ａの半径方向において、平坦面８，９の巾寸法よりも環状溝１０，１１の巾寸法が広くされている。これにより、確実に弾性層周縁部の局部応力を緩和することができ、また、平坦面側の弾性層よりも環状溝間の弾性層の変形が容易であるので、桁の撓みに追随して弾性支承体１Ａの回転支承作用を容易にすることができる。なお、図示の形態では、平面視した場合、薄肉弾性層４ｂ部分の平坦面８，９の平面面積よりも、厚肉弾性層４Ａ部分である環状溝１０，１１の平面面積が大きくなっている。
すなわち、前記形態の弾性支承体１は、間隔をおいて対向する上鋼板２の下面と下鋼板３の上面に環状溝１０，１１が設けられ、前記上鋼板２と下鋼板３の間に弾性層４が一体に固着され、半径方向中央部よりの弾性層４Ｂの厚みよりも半径方向外側寄りに対向する前記環状溝１０，１１間の弾性層４Ａの厚みが厚くされて、その外側よりの弾性層４Ａを中央部寄りの弾性層４Ｂよりも歪みやすくして、桁の撓みに対する回転支承作用を向上させた弾性支承体１Ａ（１）である。 As a common configuration of the embodiment, the width dimension of the annular grooves 10 and 11 is made wider than the width dimension of the flat surfaces 8 and 9 in the radial direction of the elastic support 1A. As a result, the local stress at the periphery of the elastic layer can be surely relieved, and deformation of the elastic layer between the annular grooves is easier than the elastic layer on the flat surface side. The rotation support operation of the elastic support body 1A can be facilitated. In the illustrated embodiment, when viewed in plan, the planar areas of the annular grooves 10 and 11 that are the thick elastic layer 4A portion are larger than the planar areas of the flat surfaces 8 and 9 of the thin elastic layer 4b portion. .
That is, the elastic support body 1 having the above-described configuration is provided with the annular grooves 10 and 11 on the lower surface of the upper steel plate 2 and the upper surface of the lower steel plate 3 which are opposed to each other with a space therebetween. The layer 4 is fixed integrally, and the thickness of the elastic layer 4A between the annular grooves 10 and 11 opposed to the outer side in the radial direction is made thicker than the thickness of the elastic layer 4B from the central portion in the radial direction. This is an elastic bearing body 1A (1) in which the elastic layer 4A is more easily distorted than the elastic layer 4B closer to the center, and the rotational bearing action against the bending of the girders is improved.

弾性層４の外周部は、半円形の側部溝１５が形成されて、上鋼板２および下鋼板３と弾性層４との接着界面における前記側部溝１５付近の弾性層の厚みを薄くし、弾性層の膨出変形時に作用する剥離力が小さくなるようにされ、また、弾性層４に一体に、上鋼板２および下鋼板３は、弾性層と同じ材質による薄肉被覆層１６が設けられて、上鋼板２および下鋼板３の防錆を図り、弾性支承体１Ａの耐候性を向上させるように構成されている。   A semicircular side groove 15 is formed on the outer peripheral portion of the elastic layer 4 to reduce the thickness of the elastic layer near the side groove 15 at the bonding interface between the upper steel plate 2 and the lower steel plate 3 and the elastic layer 4. The peeling force acting when the elastic layer bulges is reduced, and the upper steel plate 2 and the lower steel plate 3 are provided with a thin coating layer 16 made of the same material as the elastic layer, integrally with the elastic layer 4. Thus, the upper steel plate 2 and the lower steel plate 3 are configured to be rust-proof and to improve the weather resistance of the elastic bearing body 1A.

図３は、本発明の第２実施形態の弾性支承体１Ｂ（１）を示すものであって、この形態は、前記第１実施形態の変形形態を示すものであって、相違する部分は、対向する環状溝１０，１１の底部１２，１３は、半径方向外側よりに漸次離反するような傾斜面１７，１８とされ、各環状溝１０，１１の底部間の厚肉弾性層４Ａは、半径方向外側よりに漸次厚くなるようにされていることにより、確実に半径方向外側に向かって応力および歪を緩和できるようにされて、弾性層４Ａ周縁部の局部応力を緩和するようにされ、弾性層４の外周部付近と上鋼板２および下鋼板３との接着界面に作用する剥離力が小さくなるようにされ、また、半径方向外側において漸次弾性層４の厚みが厚くなるようにされているので、半径方向で外側の弾性層４Ａの変形が容易となり、桁の撓みによる上鋼板２の傾動が容易であり、すなわち、桁の撓みに対する弾性支承体１Ｂの回転支承作用を容易にすることができる。   FIG. 3 shows an elastic bearing body 1B (1) of a second embodiment of the present invention, and this form shows a modified form of the first embodiment, and different parts are as follows. The bottom portions 12 and 13 of the opposed annular grooves 10 and 11 are inclined surfaces 17 and 18 that gradually separate from the radially outer side, and the thick elastic layer 4A between the bottom portions of the annular grooves 10 and 11 has a radius By gradually increasing the thickness from the outer side in the direction, the stress and strain can be surely reduced toward the outer side in the radial direction, and the local stress at the peripheral edge of the elastic layer 4A can be reduced. The peeling force that acts on the adhesion interface between the vicinity of the outer periphery of the layer 4 and the upper steel plate 2 and the lower steel plate 3 is reduced, and the thickness of the elastic layer 4 is gradually increased radially outward. Therefore, the elastic layer 4A on the outer side in the radial direction Shape is facilitated, it is easy to tilt the upper steel plate 2 due to bending of the girder, i.e., it can facilitate rotation bearing action of the resilient support body 1B relative to the deflection of the girder.

その他の構成は、前記実施形態と同様であるので、同様な要素には同様な符号を付して説明を省略する。   Since other configurations are the same as those of the above-described embodiment, the same elements are denoted by the same reference numerals and the description thereof is omitted.

図４は、本発明の第３実施形態の弾性支承体１Ｃ（１）を示すものであって、対向する環状溝１０，１１の半径方向外側において、上鋼板２と下鋼板３との対向面は半径方向外側に向かって漸次離反するような傾斜面１７，１８とされている。このようにすると、傾斜面１７，１８間により半径方向外側に向かって広がる解放空間を形成することができ、そのため、圧縮荷重等を受けた弾性層４の逃げ変形空間を容易に形成できると共に、この部分に膨出した場合の弾性層４の局部応力および歪を緩和することができる。その他の構成は、前記実施形態と同様であるので、同様な要素には同様な符号を付して説明を省略する。   FIG. 4 shows an elastic bearing body 1C (1) according to a third embodiment of the present invention, and the opposed surfaces of the upper steel plate 2 and the lower steel plate 3 on the radially outer sides of the opposed annular grooves 10 and 11. Are inclined surfaces 17, 18 that gradually move away radially outward. In this way, it is possible to form a release space that spreads outward in the radial direction between the inclined surfaces 17 and 18, and therefore, it is possible to easily form a relief deformation space of the elastic layer 4 that has received a compressive load and the like, The local stress and strain of the elastic layer 4 when it bulges in this portion can be relaxed. Since other configurations are the same as those of the above-described embodiment, the same elements are denoted by the same reference numerals and the description thereof is omitted.

図５は、本発明の第４実施形態の弾性支承体１Ｄ（１）が示されている。この形態では、環状溝１０，１１に変えて、環状段部１９，２０とした形態である。具体的には、上鋼板２と下鋼板３との対向面における半径方向中央部よりにそれぞれ平坦面８，９が設けられ、前記各平坦面８，９に接続すると共に、上鋼板２と下鋼板３との対向面が離れるような環状段部１９，２０がそれぞれ上鋼板２と下鋼板３とに設けられ、対向する前記各環状段部１９，２０の底部１２，１３間の厚肉弾性層４Ａにより応力緩和層が形成されている。
このような形態では、弾性層４における半径方向外周側よりの環状段部底部１２，１３間の部分が、中央側よりの平坦面間よりも肉厚の厚い厚肉部とされているので、上部構造物７を弾性的に支持している状態では、上鋼板２または下鋼板３から受ける荷重による弾性層４の歪のうち、半径方向中央側よりの平坦面８，９間の弾性層４Ｂの歪よりも、半径方向外周側よりの環状段部底部１２，１３間の部分の単位厚さ当りの歪を小さくすることができると共に、弾性層４周縁部の局部応力を緩和することができ、そのため、上鋼板２および下鋼板３と弾性層４の外周側より部分との接着界面に作用する剥離力を低減することができ、弾性支承体１Ｄの耐久性を向上させることができる効果が得られる。
また、この形態では、対向する環状溝１０，１１の半径方向外側において、上鋼板２と下鋼板３との対向面は半径方向外側に向かって漸次離反するような傾斜面２１，２２とされている。このようにすると、傾斜面２１，２２間により半径方向外側に向かって広がる解放空間を形成することができ、そのため、圧縮荷重等を受けた弾性層４の逃げ変形空間を容易に形成できると共に、この部分に膨出した場合の弾性層４の局部応力および歪を緩和することができる。
この形態の弾性支承体１Ｄ（１）は、間隔をおいて対向する上鋼板２の下面と下鋼板３の上面に環状段部１９，２０が設けられ、前記上鋼板２と下鋼板３の間に弾性層４が一体に固着され、半径方向中央部よりの弾性層４の厚みよりも半径方向外側よりに対向する前記環状段部１９，２０間の弾性層４の厚みを厚くして、弾性層４の中央部よりも外側よりの弾性層４を歪みやすくして、桁の撓みに対する回転支承作用を向上させた弾性支承体である。 FIG. 5 shows an elastic bearing member 1D (1) according to a fourth embodiment of the present invention. In this embodiment, the annular grooves 19 and 20 are used instead of the annular grooves 10 and 11. Specifically, flat surfaces 8 and 9 are respectively provided from the radial center portions of the opposing surfaces of the upper steel plate 2 and the lower steel plate 3 and connected to the flat surfaces 8 and 9, respectively. The annular step portions 19 and 20 are provided on the upper steel plate 2 and the lower steel plate 3 so that the facing surfaces of the steel plate 3 are separated from each other, and the thick elasticity between the bottom portions 12 and 13 of the respective annular step portions 19 and 20 facing each other. A stress relaxation layer is formed by the layer 4A.
In such a form, the portion between the annular step bottoms 12 and 13 from the radially outer peripheral side in the elastic layer 4 is a thick part thicker than between the flat surfaces from the center side. In the state in which the upper structure 7 is elastically supported, the elastic layer 4B between the flat surfaces 8 and 9 from the center side in the radial direction out of the strain of the elastic layer 4 due to the load received from the upper steel plate 2 or the lower steel plate 3 The strain per unit thickness of the portion between the annular step bottoms 12 and 13 from the outer peripheral side in the radial direction can be reduced, and the local stress at the peripheral portion of the elastic layer 4 can be reduced. Therefore, the peeling force acting on the bonding interface between the upper steel plate 2 and the lower steel plate 3 and the outer peripheral side of the elastic layer 4 can be reduced, and the durability of the elastic bearing body 1D can be improved. can get.
In this embodiment, on the radially outer side of the opposed annular grooves 10 and 11, the opposed surfaces of the upper steel plate 2 and the lower steel plate 3 are inclined surfaces 21 and 22 that gradually separate toward the radially outer side. Yes. In this way, it is possible to form a release space that spreads outward in the radial direction between the inclined surfaces 21 and 22, so that it is possible to easily form a relief deformation space of the elastic layer 4 that has received a compressive load and the like, The local stress and strain of the elastic layer 4 when it bulges in this portion can be relaxed.
The elastic support body 1D (1) of this embodiment is provided with annular step portions 19 and 20 on the lower surface of the upper steel plate 2 and the upper surface of the lower steel plate 3 which are opposed to each other at an interval, and between the upper steel plate 2 and the lower steel plate 3. The elastic layer 4 is integrally fixed to the elastic layer 4, and the thickness of the elastic layer 4 between the annular step portions 19 and 20 facing the outer side in the radial direction is made thicker than the thickness of the elastic layer 4 from the central portion in the radial direction. This is an elastic bearing body in which the elastic layer 4 from the outside of the center portion of the layer 4 is easily distorted to improve the rotational bearing action against bending of the girders.

図６および図７は、前記の実施形態の弾性支承体１（１Ａ〜１Ｄ）のいずれかを備えた固定式弾性支承装置２３の代表形態を示すものであって、この形態では、第１実施形態の弾性支承体１Ａを、上部構造物７と下部構造物２４との間に設置した状態が示されている。   6 and 7 show a representative form of the fixed elastic bearing device 23 provided with any one of the elastic bearing bodies 1 (1A to 1D) of the above-described embodiment. The state which installed the elastic support body 1A of the form between the upper structure 7 and the lower structure 24 is shown.

下鋼板３は、コンクリート製の下部構造物２４にアンカーボルト２５の上部雄ねじ部にねじ込み固定の雌ねじ付きボルト２６により下部構造物２４に固定され、上鋼板２の上に突起挿通孔および環状膨出部２７を有する鋼製上沓２８が嵌合載置され、前記上沓２８に、Ｈ形鋼製桁７ａからなる上部構造物７におけるソールプレート２９が前記環状膨出部２７に嵌合載置され、桁７ａにおける下フランジ３０に挿通されると共に、上沓２８の雌ねじ孔にねじ込み固定されたセットボルト３１により、桁７ａ等の上部構造物７と下部構造物２４とは一体に連結されている。なお、前記の雌ねじ付きボルト２６の頭部は、平面視で多角形等とされて回動工具係合用側周面が形成されている。   The lower steel plate 3 is fixed to the lower structure 24 by a female screwed bolt 26 that is screwed and fixed to the upper male screw portion of the anchor bolt 25 on the concrete lower structure 24, and a protrusion insertion hole and an annular bulge are formed on the upper steel plate 2. A steel upper rod 28 having a portion 27 is fitted and mounted on the upper rod 28, and a sole plate 29 in the upper structure 7 made of an H-shaped steel girder 7 a is fitted and mounted on the annular bulging portion 27. The upper structure 7 such as the girder 7a and the lower structure 24 are integrally connected by a set bolt 31 that is inserted into the lower flange 30 of the girder 7a and fixed in the female screw hole of the upper collar 28. Yes. The head of the female threaded bolt 26 has a polygonal shape or the like in plan view to form a rotating tool engaging side peripheral surface.

図８および図９は、本発明の第５実施形態の弾性支承体１Ｅを示すものであって、この形態では、せん断変形拘束用突起５の上端部は、上鋼板２における板厚方向中間部に配置され、上鋼板２の上部には凹溝３２が設けられ、その凹溝３２に滑り支承材３３が嵌合されて接着剤により固着され、桁７ａ等の上部構造物７を橋軸方向等に滑り移動可能に可動式に支承する形態である。   8 and 9 show an elastic bearing body 1E according to a fifth embodiment of the present invention. In this embodiment, the upper end portion of the shear deformation restraining projection 5 is an intermediate portion in the plate thickness direction of the upper steel plate 2. A groove 32 is provided in the upper part of the upper steel plate 2, and a sliding bearing member 33 is fitted into the groove 32 and is fixed by an adhesive, so that the upper structure 7 such as the girder 7 a is connected in the direction of the bridge axis. It is the form which is supported so that sliding movement is possible.

前記の滑り支承材３３としては、四フッ化エチレン板が使用される。その他の構成は、前記実施形態と同様であるので、同様な要素には同様な符号を付して説明を省略する。   As the sliding bearing member 33, an ethylene tetrafluoride plate is used. Since other configurations are the same as those of the above-described embodiment, the same elements are denoted by the same reference numerals and the description thereof is omitted.

図１０および図１１は、図９に示す形態の弾性支承体１Ｅを上部構造物７と下部構造物２４との間に備えた可動式弾性支承装置３５を設けた状態を示すものであって、上沓２８の下面にステンレス板等の滑り板３４が固定され、その滑り板３４を四フッ化エチレン板などの滑り支承材上に滑り移動可能に載置されている状態が示されている。   10 and 11 show a state in which a movable elastic support device 35 provided with an elastic support 1E of the form shown in FIG. 9 between the upper structure 7 and the lower structure 24 is provided. A sliding plate 34 such as a stainless steel plate is fixed to the lower surface of the upper rod 28, and the sliding plate 34 is slidably mounted on a sliding bearing material such as an ethylene tetrafluoride plate.

その他の構成は、前記実施形態と同様であるので、同様な要素には同様な符号を付して説明を省略する。   Since other configurations are the same as those of the above-described embodiment, the same elements are denoted by the same reference numerals and the description thereof is omitted.

このように、本発明の弾性支承体１（１Ａ〜１Ｅ）および弾性支承装置２３，３５は、固定式または可動式のいずれの支承形式に使用してもよい。   As described above, the elastic bearing body 1 (1A to 1E) and the elastic bearing devices 23 and 35 of the present invention may be used for any of the fixed and movable bearing types.

なお、前記各実施形態の特徴として、次のような特徴もある。
（１）従来、弾性層４内に設けられている鋼板などの硬質板を埋め込み配置する形態では、硬質板の上下に弾性層を配置する形態となり、弾性層の材料が多く必要になるが、本発明実施形態の場合は、硬質板を省略し、弾性層の厚み寸法を小さくしているので、弾性層の材料を少なくし、かつ装置の上下方向の小型化も可能になり安価な装置とすることができる。
（２）ベースプレートとしての下鋼板３にせん断変形拘束用突起５を設けている形態であるので、せん断変形拘束壁を、弾性支承体の外側に設ける場合に比べて、装置が小型化され、安価な弾性支承装置とすることができる。
（３）弾性層４は、半径方向外側またはその近傍が、中央側よりも肉厚の厚い厚肉部とされている形態では、半径方向外側の弾性層４の局部応力を低減させて緩和することができ、弾性層周縁部と上鋼板２または下鋼板３との剥離を確実に防止することができる。
（４）せん断変形拘束用突起５が弾性支承体１（１Ａ，１Ｅ）の内部に内臓されているので、せん断力変形拘束用突起５が腐食する恐れがなく、耐候性を向上させることができる。
（５）弾性層４は、上鋼板２および下鋼板３と一体に設けられているので、弾性支承体１（１Ａ〜１Ｅ）を加硫一体成型するための金型内側の形状が、シンプルになるので、金型製作費用が安価になると共に、弾性支承体１（１Ａ〜１Ｅ）の製造コストを低減することができる。 In addition, the following features are also provided as the features of each of the embodiments.
(1) Conventionally, in a form in which a hard plate such as a steel plate provided in the elastic layer 4 is embedded and arranged, an elastic layer is arranged above and below the hard plate, and a large amount of material for the elastic layer is required. In the case of the embodiment of the present invention, since the hard plate is omitted and the thickness of the elastic layer is reduced, the material of the elastic layer is reduced, and the apparatus can be downsized in the vertical direction. can do.
(2) Since the lower steel plate 3 as the base plate is provided with the shear deformation restraining projection 5, the apparatus is downsized and inexpensive compared with the case where the shear deformation restraining wall is provided outside the elastic support. It can be set as an elastic bearing device.
(3) The elastic layer 4 is reduced by reducing the local stress of the elastic layer 4 on the outer side in the radial direction in the form in which the outer side in the radial direction or the vicinity thereof is a thick part thicker than the center side. It is possible to reliably prevent peeling between the peripheral edge portion of the elastic layer and the upper steel plate 2 or the lower steel plate 3.
(4) Since the shear deformation restraining projections 5 are incorporated in the elastic bearing member 1 (1A, 1E), the shear force deformation restraining projections 5 are not corroded, and the weather resistance can be improved. .
(5) Since the elastic layer 4 is provided integrally with the upper steel plate 2 and the lower steel plate 3, the inner shape of the mold for integrally vulcanizing the elastic support body 1 (1A to 1E) is simple. As a result, the manufacturing cost of the mold is reduced, and the manufacturing cost of the elastic bearing body 1 (1A to 1E) can be reduced.

本発明を実施する場合、前記の弾性層４としては、天然ゴムあるいは合成ゴムなど弾性材料を使用する。   In carrying out the present invention, the elastic layer 4 is made of an elastic material such as natural rubber or synthetic rubber.

なお、半径方向において、平坦面の巾寸法よりも環状溝または段部の底部の巾寸法が広くされていると、確実に弾性層周縁部の局部応力を緩和することができ、また、平坦面側の弾性層よりも環状溝または環状段部底部間の弾性層の変形が容易であるので、桁の撓みに対する弾性支承体の回転支承作用（回転性）を容易にすることができる。   In the radial direction, if the width of the annular groove or the bottom of the stepped portion is wider than the width of the flat surface, the local stress at the peripheral edge of the elastic layer can be reliably relieved, and the flat surface Since the deformation of the elastic layer between the annular groove or the bottom of the annular step portion is easier than the elastic layer on the side, the rotational support action (rotation) of the elastic support body against the bending of the girder can be facilitated.

本発明の第１実施形態の弾性支承体を示す縦断正面図である。It is a vertical front view which shows the elastic support body of 1st Embodiment of this invention. 図１の平面図である。It is a top view of FIG. 本発明の第２実施形態の弾性支承体を示す縦断正面図である。It is a vertical front view which shows the elastic bearing body of 2nd Embodiment of this invention. 本発明の第３実施形態の弾性支承体を示す縦断正面図である。It is a vertical front view which shows the elastic bearing body of 3rd Embodiment of this invention. 本発明の第４実施形態の弾性支承体を示す縦断正面図である。It is a vertical front view which shows the elastic bearing body of 4th Embodiment of this invention. 第１実施形態の弾性支承体を使用した弾性支承装置により上部構造物を支承している状態を示す一部縦断正面図である。It is a partially longitudinal front view which shows the state which is supporting the upper structure with the elastic bearing apparatus using the elastic bearing body of 1st Embodiment. 図６の一部縦断側面図である。It is a partially vertical side view of FIG. 本発明の第５実施形態の弾性支承体を示す縦断正面図である。It is a vertical front view which shows the elastic bearing body of 5th Embodiment of this invention. 図８の平面図である。It is a top view of FIG. 図８に示す第５実施形態の弾性支承体を使用した弾性支承装置により上部構造物をスライド可能に支承している状態を示す一部縦断正面図である。It is a partially longitudinal front view which shows the state which is supporting the upper structure so that sliding is possible by the elastic bearing apparatus using the elastic bearing body of 5th Embodiment shown in FIG. 図１０の一部縦断側面図である。It is a partially vertical side view of FIG. 従来の弾性支承体の一例を示すものであって、（ａ）は平面図、（ｂ）は縦断正面図である。An example of the conventional elastic support body is shown, Comprising: (a) is a top view, (b) is a vertical front view.

符号の説明Explanation of symbols

１ 弾性支承体
１Ａ 弾性支承体
１Ｂ 弾性支承体
１Ｃ 弾性支承体
１Ｄ 弾性支承体
１Ｅ 弾性支承体
２ 上鋼板
３ 下鋼板
４ 弾性層
５ せん断変形拘束用突起
６ 雄ねじ部
７ 上部構造物
７ａ 鋼製桁
８ 平坦面（上鋼板側）
９ 平坦面（下鋼板側）
１０ 環状溝（上鋼板側）
１０Ａ 縦壁面（上鋼板側）
１１ 環状溝（下鋼板側）
１１Ａ 縦壁面（下鋼板側）
１２ 底部（上鋼板側）
１２Ａ 縦壁面
１３ 底部（下鋼板側）
１４ 縦壁面
１５ 側部溝
１６ 被覆層
１７ 傾斜面（上鋼板側）
１８ 傾斜面（下鋼板側）
１９ 環状段部
２０ 環状段部
２１ 傾斜面（上鋼板側）
２２ 傾斜面（下鋼板側）
２３ 固定式弾性支承装置
２４ 下部構造物
２５ アンカーボルト
２６ 雌ねじ付きボルト
２７ 環状膨出部
２８ 上沓
２９ ソールプレート
３０ 下フランジ
３１ セットボルト
３２ 凹溝
３３ 滑り支承材
３４ 滑り板
３５ 可動式弾性支承装置
３６ 弾性支承体
３７ 上部鋼板
３８ 下部鋼板
３９ 弾性層
４０ 耐圧補強鋼板
４１ すべり支承材 DESCRIPTION OF SYMBOLS 1 Elastic bearing body 1A Elastic bearing body 1B Elastic bearing body 1C Elastic bearing body 1D Elastic bearing body 1E Elastic bearing body 2 Upper steel plate 3 Lower steel plate 4 Elastic layer 5 Shear deformation restraining protrusion 6 Male thread part 7 Upper structure 7a Steel girder 8 Flat surface (upper steel plate side)
9 Flat surface (lower steel plate side)
10 annular groove (upper steel plate side)
10A vertical wall (upper steel plate side)
11 annular groove (lower steel plate side)
11A Vertical wall (lower steel plate side)
12 Bottom (upper steel plate side)
12A Vertical wall surface 13 Bottom (lower steel plate side)
14 vertical wall surface 15 side groove 16 coating layer 17 inclined surface (upper steel plate side)
18 Inclined surface (lower steel plate side)
19 Annular step 20 Annular step 21 Inclined surface (upper steel plate side)
22 Inclined surface (lower steel plate side)
Reference Signs List 23 Fixed elastic bearing device 24 Substructure 25 Anchor bolt 26 Female threaded bolt 27 Annular bulging portion 28 Upper collar 29 Sole plate 30 Lower flange 31 Set bolt 32 Groove 33 Sliding bearing material 34 Sliding plate 35 Movable elastic bearing device 36 Elastic bearing body 37 Upper steel plate 38 Lower steel plate 39 Elastic layer 40 Pressure-resistant reinforced steel plate 41 Sliding bearing material

Claims (8)

間隔をおいて対向する上鋼板の下面と下鋼板の上面に環状溝が設けられ、前記上鋼板と下鋼板の間に弾性層が一体に固着され、半径方向中央部よりの弾性層の厚みよりも半径方向外側寄りに対向する前記環状溝間の弾性層の厚みが厚くされて、その外側よりの弾性層を中央部寄りの弾性層よりも歪みやすくして、桁の撓みに対する回転性を向上させたことを特徴とする弾性支承体。   An annular groove is provided on the lower surface of the upper steel plate and the upper surface of the lower steel plate that are opposed to each other with an interval, and an elastic layer is integrally fixed between the upper steel plate and the lower steel plate. The thickness of the elastic layer between the annular grooves facing toward the outer side in the radial direction is increased, and the elastic layer from the outer side is distorted more easily than the elastic layer near the center, improving the rotational performance against bending of the girder. An elastic bearing body characterized by having been made. 対向する前記環状溝間に固着された弾性層が応力緩和層として機能していることを特徴とする請求項１に記載の弾性支承体。   The elastic support body according to claim 1, wherein an elastic layer fixed between the annular grooves facing each other functions as a stress relaxation layer. 間隔をおいて対向する環状溝の底部が、半径方向外側に向かって離反するような傾斜面とされ、前記環状溝内に設けられている弾性層の厚みが半径方向外側に向かって厚くなるようにされていることを特徴とする請求項１または２に記載の弾性支承体。   The bottoms of the annular grooves facing each other at an interval are inclined so as to be separated outward in the radial direction, and the thickness of the elastic layer provided in the annular groove is increased outward in the radial direction. The elastic support body according to claim 1 or 2, wherein 間隔をおいて対向する上鋼板の下面と下鋼板の上面に環状段部が設けられ、前記上鋼板と下鋼板の間に弾性層が一体に固着され、半径方向中央部よりの弾性層の厚みよりも半径方向外側よりに対向する前記環状段部間の弾性層の厚みを厚くして、弾性層の中央部よりも外側よりの弾性層を歪みやすくして、桁の撓みに対する回転性を向上させたことを特徴とする弾性支承体。   An annular step is provided on the lower surface of the upper steel plate and the upper surface of the lower steel plate facing each other at an interval, and an elastic layer is integrally fixed between the upper steel plate and the lower steel plate, and the thickness of the elastic layer from the central portion in the radial direction Increase the thickness of the elastic layer between the annular stepped parts facing from the outside in the radial direction, making the elastic layer from the outside more easily distorted than the center part of the elastic layer, and improving the rotational performance against bending of the girder An elastic bearing body characterized by having been made. 対向する前記環状段部間に固着された弾性層が応力緩和層として機能していることを特徴とする請求項４に記載の弾性支承体。   The elastic support body according to claim 4, wherein an elastic layer fixed between the annular step portions facing each other functions as a stress relaxation layer. 対向する前記環状段部の底部が、半径方向外側に向かって離反するような傾斜面とされ、前記環状段部内に設けられている弾性層の厚みが半径方向外側に向かって厚くなるようにされていることを特徴とする請求項４または５に記載の弾性支承体。   The bottom portions of the annular step portions facing each other are inclined surfaces that are separated from each other outward in the radial direction, and the thickness of the elastic layer provided in the annular step portion is increased toward the outer side in the radial direction. The elastic bearing body according to claim 4 or 5, wherein the elastic bearing body is provided. 前記上鋼板または前記下鋼板のいずれか一方の鋼板の中央部にせん断変形拘束用突起が設けられ、そのせん断変形拘束用突起は他方の鋼板の中央部に設けた貫通孔に嵌合されていることを特徴とする請求項１〜６のいずれかに記載の弾性支承体。   A shear deformation restraining projection is provided at the center of one of the upper steel plate and the lower steel plate, and the shear deformation restraining projection is fitted into a through hole provided at the center of the other steel plate. The elastic bearing body according to any one of claims 1 to 6, wherein 請求項１〜７のいずれかに記載の弾性支承体を備えていることを特徴とする弾性支承装置。   An elastic bearing device comprising the elastic bearing body according to claim 1.
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