JP2020169699A - Laminated rubber bearing including lead plug - Google Patents

Laminated rubber bearing including lead plug Download PDF

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JP2020169699A
JP2020169699A JP2019071833A JP2019071833A JP2020169699A JP 2020169699 A JP2020169699 A JP 2020169699A JP 2019071833 A JP2019071833 A JP 2019071833A JP 2019071833 A JP2019071833 A JP 2019071833A JP 2020169699 A JP2020169699 A JP 2020169699A
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rubber
laminated rubber
laminated
lead plug
plates
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合田　裕一
Yuichi Aida
裕一 合田
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BBM Co Ltd
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BBM Co Ltd
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Priority to JP2019071833A priority Critical patent/JP2020169699A/en
Priority to PCT/JP2020/014831 priority patent/WO2020204032A1/en
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    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D19/00—Structural or constructional details of bridges
    • E01D19/04—Bearings; Hinges
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
    • E04H9/00—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate
    • E04H9/02—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate withstanding earthquake or sinking of ground
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F1/00—Springs
    • F16F1/36—Springs made of rubber or other material having high internal friction, e.g. thermoplastic elastomers
    • F16F1/40—Springs made of rubber or other material having high internal friction, e.g. thermoplastic elastomers consisting of a stack of similar elements separated by non-elastic intermediate layers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
    • F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
    • F16F15/04—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • General Engineering & Computer Science (AREA)
  • Emergency Management (AREA)
  • Mechanical Engineering (AREA)
  • Business, Economics & Management (AREA)
  • Environmental & Geological Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Acoustics & Sound (AREA)
  • Physics & Mathematics (AREA)
  • Vibration Prevention Devices (AREA)
  • Buildings Adapted To Withstand Abnormal External Influences (AREA)
  • Springs (AREA)
  • Bridges Or Land Bridges (AREA)

Abstract

To propose a laminated rubber bearing including a lead plug which can maintain stable damping performance even if a large shear force acts thereon and does not cause harmful effect on a peripheral environment.SOLUTION: A laminated rubber bearing 1 includes: laminated rubber 2 formed by laminating multiple rubber plates 21 and multiple metal plates 22 alternately; a lead plug 3 embedded in the laminated rubber 2; an upper steel plate 41 which covers an upper surface of the laminated rubber 2; and a lower steel plate 42 which covers a lower surface of the laminated rubber 2. A thickness of the rubber plates 21, disposed at an upper part and a lower part of the laminated rubber 2, of the rubber plates 21 is smaller than a thickness of the rubber plates 21 disposed at a center part of the laminated rubber 2 as seen in a lamination direction.SELECTED DRAWING: Figure 2

Description

本発明は、鉛プラグ入り積層ゴム支承に関する。 The present invention relates to a laminated rubber bearing with a lead plug.

積層ゴム支承には、例えば、特許文献１に示すように、柱状の鉛プラグが埋め込まれたものがある。鉛プラグ入り積層ゴム支承は、地震時に積層ゴムが変形するのに伴い、鉛プラグが塑性変形することで地震エネルギーを吸収して、振動を減衰させる。 As shown in Patent Document 1, for example, some laminated rubber bearings have a columnar lead plug embedded therein. In the laminated rubber bearing with a lead plug, as the laminated rubber is deformed during an earthquake, the lead plug is plastically deformed to absorb the seismic energy and attenuate the vibration.

鉛プラグ入り積層ゴム支承は、積層ゴムを上下方向に貫通する貫通孔に柱状の鉛プラグを挿入することにより形成されるのが一般的である。積層ゴムの上面および下面は、鋼板により覆われている。 Laminated rubber bearings with lead plugs are generally formed by inserting columnar lead plugs into through holes that penetrate the laminated rubber in the vertical direction. The upper and lower surfaces of the laminated rubber are covered with a steel plate.

特開２０１５−１３２３０３号公報JP 2015-132303

前記従来の鉛プラグ入り積層ゴム支承は、大きなせん断変形が生じた場合に、積層ゴムの上部または下部のゴム層の変形が高さ方向（積層方向）中央部のゴム層の変形に比べて大きくなるため、鉛プラグが上部又は下部のゴム層に食い込むおそれがある。このような変形が生じると、免震支承として安定した減衰性能を発揮することができなくなるとともに、鉛が外気に曝されることによる環境への悪影響が懸念される。 In the conventional laminated rubber bearing with a lead plug, when a large shear deformation occurs, the deformation of the upper or lower rubber layer of the laminated rubber is larger than the deformation of the rubber layer in the central portion in the height direction (lamination direction). Therefore, the lead plug may bite into the upper or lower rubber layer. If such deformation occurs, it will not be possible to exhibit stable damping performance as a seismic isolation bearing, and there is a concern that lead will be adversely affected by exposure to the outside air.

このような観点から、本発明は、大きなせん断力が作用した場合であっても、安定した減衰性能を維持することができ、また、周辺環境へ悪影響を及ぼすことがない鉛プラグ入り積層ゴム支承を提案することを課題とする。 From this point of view, the present invention can maintain stable damping performance even when a large shearing force is applied, and also supports laminated rubber with a lead plug that does not adversely affect the surrounding environment. The challenge is to propose.

前記課題を解決するための本発明は、複数のゴム板と複数の金属板とが交互に積層されてなる積層ゴムと、前記積層ゴムに埋め込まれた鉛プラグと、前記積層ゴムの上面を覆う上鋼板と、前記積層ゴムの下面を覆う下鋼板とを備える鉛プラグ入り積層ゴム支承である。複数の前記ゴム板のうち、前記積層ゴムの上部および下部に配設されたゴム板の厚さが、前記積層ゴムの積層方向中央部に配設されたゴム板の厚さよりも小さい。 The present invention for solving the above-mentioned problems covers a laminated rubber formed by alternately laminating a plurality of rubber plates and a plurality of metal plates, a lead plug embedded in the laminated rubber, and an upper surface of the laminated rubber. A lead-plugged laminated rubber bearing including an upper steel plate and a lower steel plate that covers the lower surface of the laminated rubber. Of the plurality of rubber plates, the thickness of the rubber plates arranged at the upper and lower portions of the laminated rubber is smaller than the thickness of the rubber plates arranged at the center of the laminated rubber in the laminating direction.

かかる鉛プラグ入り積層ゴム支承によれば、地震時に他の部分に比べて大きなせん断力が作用する積層ゴムの上部と下部において、ゴム板の厚さを小さくしているため、積層ゴムの上部と下部における変位量を小さく抑えることができる。その結果、上部と下部のゴム板よりも大きい厚さのゴム板が配設された積層ゴムの中央部に比べて、積層ゴムの上部および下部における変形が極端に大きくなることを抑制することができる。そのため、鉛プラグがゴム層に食い込むことを防止し、鉛プラグを均等な圧力で拘束することができる。その結果、安定した減衰性能が確保できるとともに、鉛が大気に露出することも防止できる。 According to the lead-plugged laminated rubber bearing, the thickness of the rubber plate is reduced at the upper and lower parts of the laminated rubber on which a larger shear force acts than other parts during an earthquake, so that the upper part of the laminated rubber The amount of displacement at the bottom can be kept small. As a result, it is possible to suppress the deformation of the upper and lower parts of the laminated rubber from becoming extremely large as compared with the central part of the laminated rubber in which the rubber plates having a thickness larger than that of the upper and lower rubber plates are arranged. it can. Therefore, it is possible to prevent the lead plug from biting into the rubber layer and restrain the lead plug with an even pressure. As a result, stable damping performance can be ensured, and lead can be prevented from being exposed to the atmosphere.

なお、このような鉛プラグ入り積層ゴム支承は、前記積層ゴムの最上層および最下層に配設されたゴム板の厚さを、他の層のゴム板の厚さよりも小さくするのが望ましい。この場合には、前記積層ゴムに積層された前記複数のゴム板の厚さが、前記積層ゴムの最上層および最下層から中間層に向かうに従って大きくなるようにするのがさらに望ましい。 In such a laminated rubber bearing with a lead plug, it is desirable that the thickness of the rubber plates arranged on the uppermost layer and the lowermost layer of the laminated rubber is smaller than the thickness of the rubber plates of the other layers. In this case, it is more desirable that the thickness of the plurality of rubber plates laminated on the laminated rubber increases from the uppermost layer and the lowest layer of the laminated rubber toward the intermediate layer.

本発明の鉛プラグ入り積層ゴム支承によれば、大きなせん断力が作用した場合であっても、安定した減衰性能を発揮することができ、また、周辺環境へ悪影響を及ぼすことを防止することができる。 According to the lead-plugged laminated rubber bearing of the present invention, stable damping performance can be exhibited even when a large shearing force is applied, and it is possible to prevent adverse effects on the surrounding environment. it can.

本実施形態に係る積層ゴム支承の使用状況の例を示す正面図である。It is a front view which shows the example of the use situation of the laminated rubber bearing which concerns on this embodiment. 本実施形態に係る積層ゴム支承を示す断面図である。It is sectional drawing which shows the laminated rubber bearing which concerns on this embodiment. 本実施形態の積層ゴム支承の製造方法の各段階を示す断面図であって、（ａ）は鉛プラグの設置状況、（ｂ）はゴム板の積層状況、（ｃ）は上鋼板の設置状況である。It is sectional drawing which shows each stage of the manufacturing method of the laminated rubber bearing of this embodiment, (a) is the installation state of the lead plug, (b) is the stacking state of the rubber plate, (c) is the installation state of the upper steel plate. Is. （ａ）は本実施形態に係る鉛プラグの分解斜視図、（ｂ）および（ｃ）は他の形態に係る鉛プラグを示す斜視図である。(A) is an exploded perspective view of a lead plug according to the present embodiment, and (b) and (c) are perspective views showing a lead plug according to another embodiment. （ａ）および（ｂ）はそれぞれ他の形態に係る積層ゴム支承を示す断面図である。(A) and (b) are cross-sectional views showing laminated rubber bearings according to other forms, respectively.

本実施形態では、図１に示すように、橋梁の上部構造Ｂ１と下部構造Ｂ２との間に介設される積層ゴム支承１について説明する。本実施形態の積層ゴム支承１は、図２に示すように、積層ゴム２、鉛プラグ３、鋼板４を備える鉛プラグ入り積層ゴム支承である。 In the present embodiment, as shown in FIG. 1, a laminated rubber bearing 1 interposed between the superstructure B1 and the substructure B2 of the bridge will be described. As shown in FIG. 2, the laminated rubber bearing 1 of the present embodiment is a lead-plugged laminated rubber bearing including a laminated rubber 2, a lead plug 3, and a steel plate 4.

積層ゴム２は、複数（本実施形態では６枚）のゴム板２１と複数（本実施形態では５枚）の金属板２２とが交互に積層されてなる。本実施形態の積層ゴム２は、円柱状を呈しているが、積層ゴム２の形状は円柱に限定されるものではなく、例えば、角柱状であってもよい。また、ゴム板２１および金属板２２の枚数は限定されるものではなく、適宜決定すればよい。 The laminated rubber 2 is formed by alternately laminating a plurality of (6 sheets in the present embodiment) rubber plates 21 and a plurality of (5 sheets in the present embodiment) metal plates 22. The laminated rubber 2 of the present embodiment has a columnar shape, but the shape of the laminated rubber 2 is not limited to a cylinder, and may be, for example, a prismatic shape. Further, the number of rubber plates 21 and metal plates 22 is not limited, and may be appropriately determined.

ゴム板２１は、板状に形成された天然ゴムにより構成されている。ゴム板２１の中央部には、鉛プラグ３を挿通するための貫通孔２３が形成されている。ゴム板２１の弾性率は限定されるものではないが、本実施形態では、１．０〜６．５ＭＰａの範囲内のものを使用する。なお、ゴム板２１の貫通孔２３の位置、数、形状および配置は限定されるものではなく、鉛プラグ３の配置や形状に応じて適宜決定すればよい。また、ゴム板２１を構成する材料は、天然ゴムに限定されるものではなく、例えば、高減衰ゴムであってもよい。 The rubber plate 21 is made of natural rubber formed in a plate shape. A through hole 23 for inserting the lead plug 3 is formed in the central portion of the rubber plate 21. The elastic modulus of the rubber plate 21 is not limited, but in the present embodiment, those in the range of 1.0 to 6.5 MPa are used. The position, number, shape and arrangement of the through holes 23 of the rubber plate 21 are not limited, and may be appropriately determined according to the arrangement and shape of the lead plug 3. Further, the material constituting the rubber plate 21 is not limited to natural rubber, and may be, for example, high damping rubber.

積層ゴム２に積層された複数のゴム板２１の厚さは、積層ゴム２の最上層および最下層から中間層に向かうに従って大きい。すなわち、下から順に積層されたゴム板２１ａ〜２１ｆのうち、下側のゴム板２１ａ〜２１ｃは下から上に向かうに従って板厚が大きくなり、上側のゴム板２１ｄ〜２１ｆは上から下に向かうに従って板厚が大きくなっている。各層のゴム板２１の厚さを設定する際には、まず、地震時に想定される最大変位量が、許容変位量内に収まるように、積層ゴム２に配設される全てのゴム板２１の厚さの合計値を設定する。次に、せん断変形時における各層のゴム板２１の変位量が略均等になるように、各層のゴム板２１の厚さを設定すればよい。なお、ゴム板２１の厚さの設定方法は限定されるものではなく、適宜決定すればよい。また、ゴム板２１の面積は、積層ゴム支承１に上載される部材（上部構造）の重量や許容変位量等に応じて適宜決定すればよい。 The thickness of the plurality of rubber plates 21 laminated on the laminated rubber 2 increases from the uppermost layer and the lowest layer of the laminated rubber 2 toward the intermediate layer. That is, among the rubber plates 21a to 21f laminated in order from the bottom, the lower rubber plates 21a to 21c become thicker from the bottom to the top, and the upper rubber plates 21d to 21f go from the top to the bottom. The plate thickness increases accordingly. When setting the thickness of the rubber plates 21 of each layer, first, all the rubber plates 21 arranged on the laminated rubber 2 so that the maximum displacement amount assumed at the time of an earthquake is within the allowable displacement amount. Set the total thickness. Next, the thickness of the rubber plate 21 of each layer may be set so that the displacement amount of the rubber plate 21 of each layer at the time of shear deformation is substantially equal. The method of setting the thickness of the rubber plate 21 is not limited, and may be appropriately determined. Further, the area of the rubber plate 21 may be appropriately determined according to the weight of the member (upper structure) placed on the laminated rubber bearing 1, the allowable displacement amount, and the like.

金属板２２は、ゴム板２１と同等の平面形状を有した平面視円形の鋼板からなる。金属板２２には、鉛プラグ３を挿通するための貫通孔２４が、ゴム板２１の貫通孔２３に対応する位置に形成されている。なお、金属板２２の厚さは限定されるものではなく、積層ゴム支承１に上載される部材（上部構造Ｂ１）の重量やゴム板２１の硬度等に応じて適宜決定すればよい。 The metal plate 22 is made of a circular steel plate in a plan view having a plane shape equivalent to that of the rubber plate 21. A through hole 24 for inserting the lead plug 3 is formed in the metal plate 22 at a position corresponding to the through hole 23 of the rubber plate 21. The thickness of the metal plate 22 is not limited, and may be appropriately determined according to the weight of the member (superstructure B1) placed on the laminated rubber bearing 1, the hardness of the rubber plate 21, and the like.

鉛プラグ３は、積層ゴム２の中央部に埋め込まれている。鉛プラグ３は、積層ゴム２を構成するゴム板２１および金属板２２の貫通孔２３，２４を貫通していて、鉛プラグ３の上端部および下端部は、積層ゴム２の上面および下面から突出している。なお、本実施形態では、積層ゴム２の中央部に１本の鉛プラグ３を配置するが、鉛プラグ３の数および配置は限定されるものではない。例えば、積層ゴム２の中央部に４本の鉛プラグ３が間隔をあけて配置されていてもよい。 The lead plug 3 is embedded in the central portion of the laminated rubber 2. The lead plug 3 penetrates through holes 23 and 24 of the rubber plate 21 and the metal plate 22 constituting the laminated rubber 2, and the upper end and the lower end of the lead plug 3 project from the upper surface and the lower surface of the laminated rubber 2. ing. In the present embodiment, one lead plug 3 is arranged at the center of the laminated rubber 2, but the number and arrangement of the lead plugs 3 are not limited. For example, four lead plugs 3 may be arranged at intervals in the central portion of the laminated rubber 2.

鉛プラグ３は、円柱状を呈している。なお、鉛プラグ３の形状は円柱状に限定されるものではなく、例えば、角柱状であってもよい。本実施形態の鉛プラグ３は、弾性率が５０００〜６０００ＭＰａの範囲内の鉛からなる。なお、鉛プラグ３を構成する材料は限定されるものではない。 The lead plug 3 has a columnar shape. The shape of the lead plug 3 is not limited to a columnar shape, and may be, for example, a prismatic shape. The lead plug 3 of the present embodiment is made of lead having an elastic modulus in the range of 5000 to 6000 MPa. The material constituting the lead plug 3 is not limited.

本実施形態の鉛プラグ３は、外面が弾性被覆材３１により覆われていて、地震時等において大きな変形が生じた場合であっても鉛が大気に露出することがないように構成されている。弾性被覆材３１は、天然ゴムからなり、弾性被覆材３１のせん断弾性率および曲げ弾性率は、それぞれ２．０〜１４．０ＭＰａの範囲内および１０００〜８２０００ＭＰａの範囲内である。なお、弾性被覆材３１を構成する材料は限定されるものではなく、例えば、高減衰ゴムや、その他の樹脂系の材料であってもよい。また、弾性被覆材３１のせん断弾性率および曲げ弾性率は、前記範囲に限定されるものではない。さらに、弾性被覆材３１の厚さは、適宜決定すればよい。なお、弾性被覆材３１は必要に応じて設置すればよく、鉛プラグ３は必ずしも弾性被覆材３１により被覆されている必要はない。 The lead plug 3 of the present embodiment has an outer surface covered with an elastic coating material 31 so that lead is not exposed to the atmosphere even when a large deformation occurs at the time of an earthquake or the like. .. The elastic coating material 31 is made of natural rubber, and the shear elastic modulus and flexural modulus of the elastic coating material 31 are in the range of 2.0 to 14.0 MPa and the range of 1000 to 82000 MPa, respectively. The material constituting the elastic coating material 31 is not limited, and may be, for example, a high damping rubber or other resin-based material. Further, the shear modulus and flexural modulus of the elastic dressing 31 are not limited to the above ranges. Further, the thickness of the elastic coating material 31 may be appropriately determined. The elastic coating material 31 may be installed as needed, and the lead plug 3 does not necessarily have to be covered with the elastic coating material 31.

積層ゴム２の上面および下面は、鋼板４（上鋼板４１および下鋼板４２）により覆われている。鋼板４には、鉛プラグ３の位置に対応して貫通孔４３が形成されている。鉛プラグ３の上端部（積層ゴム２の上面から突出している部分）は、上鋼板４１の貫通孔４３に挿入しており、鉛プラグ３の下端部（積層ゴム２の下面から突出している部分）は、下鋼板４２の貫通孔４３に挿入している。鉛プラグ３の上面および下面は、それぞれ上鋼板４１の上面および下鋼板４２の下面と一致している（面一となっている）。なお、貫通孔４３は、蓋材等により遮蔽してもよい。また、鋼板４には、貫通孔４３に代えて、鉛プラグ３の端部を挿入するための溝が形成されていてもよい。また、鉛プラグ３の高さが積層ゴム２の高さ以下の場合には、鋼板４は貫通孔４３や溝が形成されていない平板であってもよい。 The upper surface and the lower surface of the laminated rubber 2 are covered with steel plates 4 (upper steel plate 41 and lower steel plate 42). A through hole 43 is formed in the steel plate 4 corresponding to the position of the lead plug 3. The upper end portion of the lead plug 3 (the portion protruding from the upper surface of the laminated rubber 2) is inserted into the through hole 43 of the upper steel plate 41, and the lower end portion of the lead plug 3 (the portion protruding from the lower surface of the laminated rubber 2). ) Is inserted into the through hole 43 of the lower steel plate 42. The upper surface and the lower surface of the lead plug 3 coincide with the upper surface of the upper steel plate 41 and the lower surface of the lower steel plate 42, respectively (is flush with each other). The through hole 43 may be shielded by a lid material or the like. Further, the steel plate 4 may be formed with a groove for inserting the end portion of the lead plug 3 instead of the through hole 43. Further, when the height of the lead plug 3 is equal to or less than the height of the laminated rubber 2, the steel plate 4 may be a flat plate having no through holes 43 or grooves formed therein.

以下、積層ゴム支承１の製造方法について説明する。積層ゴム支承１の製造方法は、積層工程と、成形工程とを備えている。
積層工程は、ゴム板２１と金属板２２を積層して、積層ゴム２を形成する工程である。積層工程では、まず、図３（ａ）に示すように、金型５上に下鋼板４２を載置するとともに、鉛プラグ３を載置する。このとき、鉛プラグ３の外面に弾性被覆材３１を被覆しておく。なお、弾性被覆材３１は、金型５上において、鉛プラグ３の外面に設置してもよい。また、鉛プラグ３の下部は、下鋼板４２の貫通孔４３に挿入する。 Hereinafter, a method for manufacturing the laminated rubber bearing 1 will be described. The manufacturing method of the laminated rubber bearing 1 includes a laminating step and a molding step.
The laminating step is a step of laminating the rubber plate 21 and the metal plate 22 to form the laminated rubber 2. In the laminating step, first, as shown in FIG. 3A, the lower steel plate 42 is placed on the mold 5, and the lead plug 3 is placed. At this time, the outer surface of the lead plug 3 is covered with the elastic coating material 31. The elastic coating material 31 may be installed on the outer surface of the lead plug 3 on the mold 5. Further, the lower portion of the lead plug 3 is inserted into the through hole 43 of the lower steel plate 42.

本実施形態では、金型５に固定プラグ５１が植設されている。固定プラグ５１は、鉛プラグ３の下端に形成された凹部３２に挿入されていて、加硫成形時に鉛プラグ３が移動することがないように、鉛プラグ３を金型５に固定している。なお、固定プラグ５１は必要に応じて設ければよい。 In this embodiment, the fixed plug 51 is planted in the mold 5. The fixing plug 51 is inserted into a recess 32 formed at the lower end of the lead plug 3, and the lead plug 3 is fixed to the mold 5 so that the lead plug 3 does not move during vulcanization molding. .. The fixed plug 51 may be provided as needed.

本実施形態では、図４（ａ）に示すように、鉛プラグ３の側面に周設した矩形状のゴム材３３と、鉛プラグ３の上下面に配設された円形状のゴム材３４により弾性被覆材３１を形成する。なお、弾性被覆材３１の形成方法は限定されるものではなく、例えば、図４（ｂ）に示すように、リング状のゴム材３３ａを鉛プラグ３の外面に沿って積層することにより、鉛プラグ３の側面を覆ってもよいし、また、図４（ｃ）に示すように、帯状のゴム材３３ｂを鉛プラグ３の外周面に螺旋状に巻き付けてもよい。または、加硫したゴム材に鉛プラグ３を挿入することで、鉛プラグ３の外面に弾性被覆材３１を被覆してもよい。 In the present embodiment, as shown in FIG. 4A, a rectangular rubber material 33 provided around the side surface of the lead plug 3 and a circular rubber material 34 arranged on the upper and lower surfaces of the lead plug 3 are used. The elastic coating material 31 is formed. The method of forming the elastic coating material 31 is not limited. For example, as shown in FIG. 4B, lead is formed by laminating a ring-shaped rubber material 33a along the outer surface of the lead plug 3. The side surface of the plug 3 may be covered, or as shown in FIG. 4C, the strip-shaped rubber material 33b may be spirally wound around the outer peripheral surface of the lead plug 3. Alternatively, the outer surface of the lead plug 3 may be coated with the elastic coating material 31 by inserting the lead plug 3 into the vulcanized rubber material.

次に、図３（ｂ）に示すように、下鋼板４２上において、ゴム板２１および金属板２２を交互に積層する。このとき、外面が弾性被覆材３１で覆われた鉛プラグ３をゴム板２１および金属板２２の貫通孔２３，２４に挿通させる。ゴム板２１は、まず、最下層に最も板厚が小さいゴム板２１ａを載置し、その後板厚が徐々に大きくなるように順番にゴム板２１（２１ａ〜２１ｃ）を積層する。そして、最も板厚が大きい中間部のゴム板２１ｃを積層したら、上に向かうに従って板厚が小さくなるように板厚の大きいゴム板２１ｄから順にゴム板２１（２１ｄ〜２１ｆ）を積層する（図３（ｃ）参照）。 Next, as shown in FIG. 3B, the rubber plate 21 and the metal plate 22 are alternately laminated on the lower steel plate 42. At this time, the lead plug 3 whose outer surface is covered with the elastic coating material 31 is inserted into the through holes 23 and 24 of the rubber plate 21 and the metal plate 22. In the rubber plate 21, first, the rubber plate 21a having the smallest plate thickness is placed on the bottom layer, and then the rubber plates 21 (21a to 21c) are laminated in order so that the plate thickness gradually increases. Then, after laminating the rubber plate 21c in the middle portion having the largest plate thickness, the rubber plates 21 (21d to 21f) are laminated in order from the rubber plate 21d having the largest plate thickness so that the plate thickness decreases toward the top (FIG. 3 (c)).

所定の枚数のゴム板２１および金属板２２を積層したら、図３（ｃ）に示すように、積層ゴム２の上面に上鋼板４１を載置する。このとき、上鋼板４１の貫通孔４３に鉛プラグ３の上部を挿入する。続いて、上鋼板４１の上面に金型５を載置する。 After laminating a predetermined number of rubber plates 21 and metal plates 22, the upper steel plate 41 is placed on the upper surface of the laminated rubber 2 as shown in FIG. 3C. At this time, the upper part of the lead plug 3 is inserted into the through hole 43 of the upper steel plate 41. Subsequently, the mold 5 is placed on the upper surface of the upper steel plate 41.

本実施形態では、金型５に固定プラグ５１が植設されている。固定プラグ５１は、鉛プラグ３の上端に形成された凹部３２に挿入されていて、加硫成形時に鉛プラグ３が移動することがないように、鉛プラグ３を金型５に固定している。なお、固定プラグ５１は必要に応じて設ければよい。 In this embodiment, the fixed plug 51 is planted in the mold 5. The fixing plug 51 is inserted into a recess 32 formed at the upper end of the lead plug 3, and the lead plug 3 is fixed to the mold 5 so that the lead plug 3 does not move during vulcanization molding. .. The fixed plug 51 may be provided as needed.

成形工程では、ゴム板２１、金属板２２、鉛プラグ３および鋼板４を加硫成形する。加硫成形は、プレス機（図示せず）内に設置された金型５を上下から圧縮するとともに、加熱することにより行う。加硫成形することにより、積層ゴム２および鉛プラグ３が一体に成形される。加硫成形後、脱型する。脱型時には、金型５とともに固定ピン５１を積層ゴム支承１から抜きとる。固定ピン５１を抜きとったら、鉛プラグ３の凹部３２を弾性被覆材３１と同じ材料等により充填する。なお、凹部３２に充填する材料は限定されるものではなく、適宜選定すればよい。 In the molding step, the rubber plate 21, the metal plate 22, the lead plug 3 and the steel plate 4 are vulcanized and molded. Vulcanization molding is performed by compressing the mold 5 installed in the press machine (not shown) from above and below and heating it. By vulcanization molding, the laminated rubber 2 and the lead plug 3 are integrally molded. After vulcanization molding, the mold is removed. At the time of demolding, the fixing pin 51 is pulled out from the laminated rubber bearing 1 together with the mold 5. After removing the fixing pin 51, the recess 32 of the lead plug 3 is filled with the same material as the elastic coating material 31. The material to be filled in the recess 32 is not limited, and may be appropriately selected.

本実施形態の積層ゴム支承１によれば、積層ゴム２の上部と下部に配設されたゴム板２１の板厚が中央部のゴム板２１の板厚よりも小さいため、各層のゴム板２１の変形量の均等化を図ることが可能となる。すなわち、積層ゴム２の上部および下部では、ゴム板２１の厚さが小さいため、ゴム板２１の変形量が小さい。その結果、せん断力が作用した際の積層ゴム２の上部および下部における変形が他の部分に比べて極端に大きくなることを抑制することができる。そのため、鉛プラグ３がゴム層（ゴム板２１）に食い込むことを防止し、鉛プラグ３を均等な圧力で拘束することができる。その結果、安定した減衰性能が確保できるとともに、大きなせん断変形が生じた場合であっても鉛が大気に露出することを防止できる。 According to the laminated rubber bearing 1 of the present embodiment, the thickness of the rubber plates 21 arranged at the upper and lower parts of the laminated rubber 2 is smaller than the thickness of the rubber plate 21 at the center, so that the rubber plates 21 of each layer It is possible to equalize the amount of deformation of. That is, since the thickness of the rubber plate 21 is small at the upper and lower parts of the laminated rubber 2, the amount of deformation of the rubber plate 21 is small. As a result, it is possible to prevent the deformation of the upper portion and the lower portion of the laminated rubber 2 when a shearing force is applied from becoming extremely large as compared with the other portions. Therefore, it is possible to prevent the lead plug 3 from biting into the rubber layer (rubber plate 21) and restrain the lead plug 3 with an even pressure. As a result, stable damping performance can be ensured, and lead can be prevented from being exposed to the atmosphere even when a large shear deformation occurs.

以上、本発明に係る実施形態について説明した。しかし、本発明は前述の実施形態に限られず、各構成要素については本発明の趣旨を逸脱しない範囲で適宜変更が可能である。
例えば、前記実施形態では、鉛プラグ入り積層ゴム支承１を橋梁に使用する場合について説明したが、鉛プラグ入り積層ゴム支承１の設置箇所は橋梁に限定されるものではなく、あらゆる構造物に適用可能である。 The embodiment according to the present invention has been described above. However, the present invention is not limited to the above-described embodiment, and each component can be appropriately modified without departing from the spirit of the present invention.
For example, in the above embodiment, the case where the lead plug-containing laminated rubber bearing 1 is used for a bridge has been described, but the installation location of the lead plug-containing laminated rubber bearing 1 is not limited to the bridge, and is applicable to all structures. It is possible.

また、前記実施形態では、鉛プラグ３の端部が積層ゴム２の上面および下面から突出している場合について説明したが、鉛プラグ３の端部は積層ゴム２から突出している必要はない。この場合には、鋼板４に貫通孔４３を形成する必要はない。 Further, in the above embodiment, the case where the end portion of the lead plug 3 protrudes from the upper surface and the lower surface of the laminated rubber 2 has been described, but the end portion of the lead plug 3 does not need to protrude from the laminated rubber 2. In this case, it is not necessary to form the through hole 43 in the steel plate 4.

前記実施形態では、積層ゴム２の最上層および最下層から中間層に向かうに従ってゴム板２１の板厚が大きくなるようにしたが、複数のゴム板２１のうち、積層ゴム２の上部および下部に配設されたゴム板２１の厚さが、中央部に配設されたゴム板２１の厚さよりも小さければよく、ゴム板２１の配置は限定されるものではない。例えば、図５（ａ）に示すように、積層ゴム２の最上層および最下層に配設されたゴム板２１ａ，２１ｆのみの厚さが、他の層のゴム板２１（２１ｂ〜２１ｅ）の厚さよりも小さく、かつ、最上層および最下層以外の層に配設されたゴム板２１ｈの厚さは一定であってもよい。また、図４（ｂ）に示すように、積層ゴム２の上から数層（図面では２層）のゴム板２１（２１ｇ，２１ｆ）および下から数層（図面では２層）のゴム板２１（２１ａ，２１ｂ）の厚さが同一で、なおかつ、他の層（中間部）のゴム板２１（２１ｃ〜２１ｅ）の厚さよりも小さくてもよい。また、積層ゴム２の最上層（上部）に配設されたゴム板２１と最下層（下部）に配設されたゴム板２１の厚さは異なっていてもよいし、同一であってもよい。 In the above embodiment, the thickness of the rubber plate 21 is increased from the uppermost layer and the lowest layer of the laminated rubber 2 toward the intermediate layer, but among the plurality of rubber plates 21, the upper and lower parts of the laminated rubber 2 are covered. The thickness of the arranged rubber plate 21 may be smaller than the thickness of the rubber plate 21 arranged in the central portion, and the arrangement of the rubber plate 21 is not limited. For example, as shown in FIG. 5A, the thickness of only the rubber plates 21a and 21f arranged on the uppermost layer and the lowermost layer of the laminated rubber 2 is the thickness of the rubber plates 21 (21b to 21e) of the other layers. The thickness of the rubber plate 21h, which is smaller than the thickness and is arranged in layers other than the uppermost layer and the lowermost layer, may be constant. Further, as shown in FIG. 4 (b), the rubber plate 21 (21 g, 21f) having several layers (two layers in the drawing) from the top of the laminated rubber 2 and the rubber plate 21 having several layers (two layers in the drawing) from the bottom. The thickness of (21a, 21b) may be the same, and may be smaller than the thickness of the rubber plates 21 (21c to 21e) of the other layer (intermediate portion). Further, the thicknesses of the rubber plate 21 arranged on the uppermost layer (upper part) of the laminated rubber 2 and the rubber plate 21 arranged on the lowermost layer (lower part) may be different or the same. ..

また、前記実施形態では、鉛プラグ３を挿通させつつゴム板２１および金属板２２を積層して積層ゴム２を形成する場合について説明したが、鉛プラグ３はゴム板２１と金属板２２とが積層された積層ゴム２の貫通孔２３，２４に後から挿入してもよい。 Further, in the above embodiment, the case where the rubber plate 21 and the metal plate 22 are laminated to form the laminated rubber 2 while the lead plug 3 is inserted has been described, but the lead plug 3 has the rubber plate 21 and the metal plate 22 It may be inserted later into the through holes 23 and 24 of the laminated laminated rubber 2.

１ 積層ゴム支承（鉛プラグ入り積層ゴム支承）
２ 積層ゴム
２１ ゴム板
２２ 金属板
３ 鉛プラグ
４ 鋼板
４１ 上鋼板
４２ 下鋼板 1 Laminated rubber bearings (laminated rubber bearings with lead plugs)
2 Laminated rubber 21 Rubber plate 22 Metal plate 3 Lead plug 4 Steel plate 41 Upper steel plate 42 Lower steel plate

Claims (3)

複数のゴム板と複数の金属板とが交互に積層されてなる積層ゴムと、
前記積層ゴムに埋め込まれた鉛プラグと、
前記積層ゴムの上面を覆う上鋼板と、
前記積層ゴムの下面を覆う下鋼板と、を備える鉛プラグ入り積層ゴム支承であって、
複数の前記ゴム板のうち、前記積層ゴムの上部および下部に配設されたゴム板の厚さが、前記積層ゴムの積層方向中央部に配設されたゴム板の厚さよりも小さいことを特徴とする鉛プラグ入り積層ゴム支承。 Laminated rubber, which is made by alternately laminating multiple rubber plates and multiple metal plates,
The lead plug embedded in the laminated rubber and
An upper steel plate that covers the upper surface of the laminated rubber and
A lead-plugged laminated rubber bearing comprising a lower steel plate covering the lower surface of the laminated rubber.
Among the plurality of rubber plates, the thickness of the rubber plates arranged at the upper and lower portions of the laminated rubber is smaller than the thickness of the rubber plates arranged at the center of the laminated rubber in the laminating direction. Laminated rubber bearing with lead plug. 前記積層ゴムの最上層および最下層に配設されたゴム板の厚さが、他の層のゴム板の厚さよりも小さいことを特徴とする請求項１に記載の鉛プラグ入り積層ゴム支承。 The lead plug-containing laminated rubber bearing according to claim 1, wherein the thickness of the rubber plates arranged on the uppermost layer and the lowermost layer of the laminated rubber is smaller than the thickness of the rubber plates of the other layers. 前記積層ゴムに積層された前記複数のゴム板の厚さが、前記積層ゴムの最上層および最下層から中間層に向かうに従って大きくなることを特徴とする請求項２に記載の鉛プラグ入り積層ゴム支承。 The lead plug-containing laminated rubber according to claim 2, wherein the thickness of the plurality of rubber plates laminated on the laminated rubber increases from the uppermost layer and the lowest layer of the laminated rubber toward the intermediate layer. Support.
JP2019071833A 2019-04-04 2019-04-04 Laminated rubber bearing including lead plug Pending JP2020169699A (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0339633U (en) * 1989-05-17 1991-04-17
JPH0860746A (en) * 1994-08-22 1996-03-05 Oiles Ind Co Ltd Lead-sealed laminated rubber
JP2004308861A (en) * 2003-04-10 2004-11-04 Bando Chem Ind Ltd Seismic isolation unit

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0339633U (en) * 1989-05-17 1991-04-17
JPH0860746A (en) * 1994-08-22 1996-03-05 Oiles Ind Co Ltd Lead-sealed laminated rubber
JP2004308861A (en) * 2003-04-10 2004-11-04 Bando Chem Ind Ltd Seismic isolation unit

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