JP2018013235A - Laminated rubber bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress degradation of energy absorption performance in earthquake of long period, while keeping performance of a laminated rubber bearing in normal earthquake.SOLUTION: In a laminated rubber bearing 1 including a laminated rubber body 6 having at least one through hole 6a vertically penetrating through a laminated rubber portion configured by alternately laminating rubber layers 2 and reinforcement plates 3, and at least one attenuator plug (lead plug) 9 enclosed in the through hole, T≥26×T×Dis satisfied when Tis the total thickness of the reinforcement plates, Tis the total thickness of the rubber layers, and D is a diameter of the laminated rubber body in a case of the circular shape in a top view, a length of one side in a case of the square shape in the top view, and a length of a short side in a case of the rectangular shape in the top view, and an inner peripheral face of each of the reinforcement plates and an outer peripheral face of the attenuator plug are disposed while kept into contact with each other or close to each other. The reinforcement plates may have the thicknesses same as each other, or a part of the reinforcement plates may have the thickness larger than that of the other reinforcement plates.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a laminated rubber bearing, and more particularly, a laminated rubber having a damping body that generates heat when absorbing vibration energy of a plastic metal, a friction material, or the like in a laminated rubber body in which rubber layers and reinforcing plates are alternately laminated. Regarding support.

  As an example of the laminated rubber support, in Patent Document 1, as shown in FIG. 5, a laminated rubber body 86 in which rubber layers 82 and reinforcing plates 83 are alternately laminated, and has thick steel plates 84 and 85 above and below, In addition to transmitting the horizontal force between the mounting steel plates 87 and 88 and the mounting steel plates 87 and 88 and the thick steel plates 84 and 85 respectively attached to the upper and lower structures, lead is passed through the through holes 86a of the laminated rubber body 86. Shear keys 90, 91 provided for enclosing the plug 89, bolts 93, 94 for fastening the mounting steel plates 87, 88 and the thick steel plates 84, 85, and the mounting steel plates 87, 88 to the upper and lower structures. A laminated rubber bearing 81 composed of holes 95 and 96 for attaching to a rubber is described.

  The laminated rubber bearing 81 having the above configuration is disposed between the upper structure and the lower structure, and when a shear deformation occurs due to a horizontal relative displacement between the upper structure and the lower structure due to a disturbance such as an earthquake, a horizontal load Is damped by elastic deformation of the rubber layer 82 and plastic deformation of the lead plug 89.

Japanese Patent Laying-Open No. 2015-45221

  However, when the laminated rubber bearing 81 is repeatedly deformed many times due to long-period ground motion or the like, the lead plug 89 generates heat due to the absorbed energy, and the energy absorption performance of the laminated rubber bearing 81 is caused by the temperature rise. It was confirmed that it decreased. When the energy absorption performance is reduced, the response displacement of the superstructure is increased, which may hinder the maintenance of the building function.

  Therefore, the present invention has been made in view of the problems in the conventional laminated rubber bearing described above, and suppresses a decrease in energy absorption performance during a long-time earthquake while maintaining the performance during a normal earthquake. The object is to provide a possible laminated rubber bearing.

In order to achieve the above object, the present invention provides a laminated rubber body having at least one through-hole penetrating vertically in a laminated rubber portion in which rubber layers and reinforcing plates are alternately laminated, and enclosed in the through-hole. In a laminated rubber bearing including at least one damping body plug, the total thickness of the reinforcing plate is T _S , the total thickness of the rubber layer is T _R , and the diameter is when the laminated rubber body is circular in top view. T _S ≧ 26 × T _R × D ^−0.5 , where D is the length of one side in the case of a square in a top view or the length of a short side in the case of a rectangle in a top view, The inner peripheral surface of each reinforcing plate and the outer peripheral surface of the attenuation body plug are arranged in contact with or close to each other.

  According to the present invention, since the total thickness of the reinforcing plate is larger than the total thickness of the reinforcing plate of the laminated rubber support that is generally used, the heat capacity increases, and the inner peripheral surface of each reinforcing plate, Since the outer peripheral surface of the attenuating body plug is in contact with or close to the outer surface, the heat accumulated in the attenuating body plug can be efficiently released to the outside due to the large thickness of the reinforcing plate. The temperature rise of the attenuation body plug can be suppressed. As a result, it is possible to suppress a decrease in energy absorption performance of the laminated rubber bearing while maintaining the performance of the laminated rubber bearing during a normal earthquake.

  In the laminated rubber bearing, the thickness of each of the reinforcing plates can be made the same, and the laminated rubber bearing according to the present invention can be constituted by a single type of reinforcing plate.

  In the laminated rubber bearing, a part of the reinforcing plate can be made thicker than other reinforcing plates having the same thickness. By making the thickness of a part of the reinforcing plate thicker than before, the laminated rubber bearing according to the present invention can be configured. At this time, a part of the reinforcing plates may be a single reinforcing plate located in the vertical center of the attenuation body plug, and at least one other reinforcing plate is interposed in the vertical direction of the attenuation body plug. A plurality of reinforcing plates can be separated from each other.

  The damping plug may be formed of a damping material that absorbs vibration energy by plastic deformation. As the damping material, lead, tin, zinc, aluminum, copper, nickel, an alloy thereof, or a non-lead-based low A melting point alloy can be used.

  Further, the damping plug may be formed of a damping material that absorbs vibration energy by plastic flow. As the damping material, a material including a thermosetting resin and rubber powder can be used.

  As described above, according to the present invention, it is possible to provide a laminated rubber bearing capable of suppressing a decrease in energy absorption performance during a long-time earthquake while maintaining performance during a normal earthquake.

BRIEF DESCRIPTION OF THE DRAWINGS The 1st Embodiment of the laminated rubber bearing which concerns on this invention is shown, (a) is a top view, (b) is the sectional view on the AA line of (a). 2nd Embodiment of the laminated rubber bearing which concerns on this invention is shown, (a) is a top view, (b) is the BB sectional drawing of (a). 3rd Embodiment of the laminated rubber bearing which concerns on this invention is shown, (a) is a top view, (b) is CC sectional view taken on the line of (a). The 4th Embodiment of the laminated rubber bearing which concerns on this invention is shown, (a) is a top view, (b) is the DD sectional view taken on the line of (a). An example of the conventional laminated rubber bearing is shown, (a) is a top view and (b) is a cross-sectional view taken along line EE of (a).

  Next, embodiments for carrying out the present invention will be described in detail with reference to the drawings.

  FIG. 1 shows a first embodiment of a laminated rubber bearing according to the present invention. This laminated rubber bearing 1 has rubber layers 2 and reinforcing plates 3 alternately as in the laminated rubber bearing 81 shown in FIG. Laminated rubber bodies 6 that are laminated and have thick steel plates 4 and 5 above and below, mounting steel plates 7 and 8 that are respectively attached to the upper and lower structures, and between the mounting steel plates 7 and 8 and the thick steel plates 4 and 5 The shear keys 10, 11, the mounting steel plates 7, 8, and the thick-walled steel plates provided for enclosing the lead force 9 as the damping plug in the through-hole 6 a of the laminated rubber body 6 while transmitting the horizontal force 4 and 5 and bolts 13 and 14 for attaching the mounting steel plates 7 and 8 to the upper and lower structures 15 and 16, respectively. The thickness of each reinforcing plate 3 is shown in FIG. It is formed thicker than the reinforcing plate (standard reinforcing plate) 83 of the conventional laminated rubber support 81.

The reinforcing plate 3 is formed of a steel plate or the like, and the thickness of each reinforcing plate 3 is the same. Here, when the total thickness of the rubber layer 2 is T _R and the diameter of the laminated rubber body 6 is D, the total thickness T _S of the reinforcing plate 3 is T _S ≧ 26 × T _R × D ^{−0. 5} and larger than the total thickness of the standard reinforcing plate. In consideration of the fact that the thickness of the reinforcing plate 3 is determined by the thickness of one layer of the rubber layer 2, this equation is standardized by the diameter D of the laminated rubber body 6 for the laminated rubber support currently commercialized. This is an equation derived experimentally. Further, the inner peripheral surface of each reinforcing plate 3 is brought into contact with the outer peripheral surface of the lead plug 9.

  The laminated rubber bearing 1 having the above-described configuration is disposed between the upper structure and the lower structure, and when a shear deformation occurs due to a horizontal relative displacement between the upper structure and the lower structure due to a disturbance such as an earthquake, a horizontal load Is damped by elastic deformation of the rubber layer 2 and plastic deformation of the lead plug 9.

  Here, in the laminated rubber support 1, the thickness of the reinforcing plate 3 is set to be thicker than that of the reinforcing plate 83, so that when the number of the reinforcing plates 3 and the reinforcing plates 83 is the same, Since the heat capacity becomes larger and the plate thickness is larger, the heat accumulated in the lead plug 9 can be efficiently released to the outside, so that the temperature rise of the lead plug 9 during a long earthquake can be suppressed. Thereby, it becomes possible to suppress the fall of the energy absorption performance of the laminated rubber support 1, maintaining the performance of the laminated rubber support 1 at the time of a normal earthquake.

  FIG. 2 shows a second embodiment of a laminated rubber bearing according to the present invention, and this laminated rubber bearing 21 has rubber layers 22 and reinforcing plates 23 alternately as in the laminated rubber bearing 81 shown in FIG. Laminated rubber bodies 26 that are stacked and have thick steel plates 24 and 25 above and below, mounting steel plates 27 and 28 that are respectively attached to the upper and lower structures, and between the mounting steel plates 27 and 28 and the thick steel plates 24 and 25. The shear keys 30, 31 provided for enclosing the lead plug 29 in the through hole 26a of the laminated rubber body 26, the mounting steel plates 27, 28, and the thick steel plates 24, 25 It consists of bolts 33 and 34 to be tightened and holes 35 and 36 for attaching the mounting steel plates 27 and 28 to the upper and lower structures, and only the reinforcing plate 23a at the center in the vertical direction of the laminated rubber body 26 has other plate thicknesses. It is formed larger than the thickness of the reinforcing plate 23 .

The reinforcing plate 23 is formed of a steel plate or the like, and the reinforcing plate 23a is formed thicker than other reinforcing plates 23 having the same thickness, and the thickness of the reinforcing plate 23a is generated at t _S and the reinforcing plate 23a. the maximum stress intensity sigma _m to the vertical plane pressure acting sigma _c, the thickness of one layer of the rubber layer 22 in the case of the _{t r} a laminated rubber body _{26, t s ≧ 3.3t r /} (( σ _m / σ _c ) -2). The other reinforcing plates 23 have the same thickness as that of the reinforcing plate 83 of the conventional laminated rubber support 81 shown in FIG.

Similarly to the first embodiment, when the total thickness of the rubber layer 22 is T _R and the diameter of the laminated rubber body 26 is D, the total thickness T _S of the reinforcing plate 23 is T _S ≧ 26. × T _R × D is set to be large than ^-0.5 and a standard total thickness of the reinforcing plate. Further, the inner peripheral surface of each reinforcing plate 23 (including the reinforcing plate 23 a) is brought into contact with the outer peripheral surface of the lead plug 29.

  The laminated rubber bearing 21 having the above-described configuration is disposed between the upper structure and the lower structure, and when a shear deformation occurs due to a horizontal relative displacement between the upper structure and the lower structure due to a disturbance such as an earthquake, a horizontal load Is damped by elastic deformation of the rubber layer 22 and plastic deformation of the lead plug 29.

  Here, in the laminated rubber support 21, the thickness of the reinforcing plate 23a at the central portion in the vertical direction of the laminated rubber body 26 is increased so that the total thickness of the reinforcing plate 23 is set thicker than before, so that the heat capacity is increased. In addition, since the heat accumulated in the lead plug 29 can be efficiently released to the outside due to the large plate thickness, the temperature rise of the lead plug 29 during a long earthquake can be suppressed. As a result, it is possible to suppress a decrease in the energy absorption performance of the laminated rubber bearing 21 while maintaining the performance of the laminated rubber bearing 21 during a normal earthquake.

  FIG. 3 shows a third embodiment of a laminated rubber bearing according to the present invention, and this laminated rubber bearing 41 has rubber layers 42 and reinforcing plates 43 alternately as in the laminated rubber bearing 81 shown in FIG. Laminated rubber bodies 46 that are stacked and have thick steel plates 44 and 45 above and below, mounting steel plates 47 and 48 that are respectively attached to the upper and lower structures, and between the mounting steel plates 47 and 48 and the thick steel plates 44 and 45. The shear keys 50 and 51, the mounting steel plates 47 and 48, and the thick steel plates 44 and 45 provided to enclose the lead plug 49 in the through-hole 46 a of the laminated rubber body 46, while transmitting the horizontal force. It consists of bolts 53 and 54 to be tightened and holes 55 and 56 for attaching the mounting steel plates 47 and 48 to the upper and lower structures, and the thickness of only the two reinforcing plates 43a is larger than the thickness of the other reinforcing plates 43. Largely formed.

Reinforcing plate 43 is formed of steel or the like, the thickness _{t s} of each of the two reinforcing plates 43a, in the same manner as mentioned _{above, t s ≧ 3.3t r / (} (σ m / σ c) -2) And The thickness of the other reinforcing plate 43 is the same as that of the reinforcing plate 83 of the conventional laminated rubber support 81 shown in FIG.

Further, similarly to the first and second embodiments, the total thickness of the rubber layer 42 T _R, the diameter of the laminated rubber body 46 in the case of the D, and the total thickness T _S of the reinforcing plate 43, T is set larger than the ^{_{S ≧ 26 × T R × D}} -0.5 and the total thickness of the standard reinforcing plate. Further, the inner peripheral surface of each reinforcing plate 43 (including the two reinforcing plates 43 a) is in contact with the outer peripheral surface of the lead plug 49.

  Also with this laminated rubber support 41, the thickness of the two reinforcing plates 43a is increased and the total thickness of the reinforcing plates 43 is set thicker than before, as in the case of the laminated rubber support 21, so that the heat capacity increases. Since the plate thickness is large, the heat accumulated in the lead plug 49 can be efficiently released to the outside, so that the temperature rise of the lead plug 49 during a long earthquake can be suppressed. Thereby, it becomes possible to suppress the fall of the energy absorption performance of the laminated rubber support 41, maintaining the performance of the laminated rubber support 41 at the time of a normal earthquake.

  FIG. 4 shows a fourth embodiment of a laminated rubber bearing according to the present invention, and this laminated rubber bearing 61 has rubber layers 62 and reinforcing plates 63 alternately as in the laminated rubber bearing 81 shown in FIG. Laminated rubber bodies 66 that are laminated and have thick steel plates 64 and 65 above and below, mounting steel plates 67 and 68 that are respectively attached to the upper and lower structures, and between the mounting steel plates 67 and 68 and the thick steel plates 64 and 65 The shear keys 70 and 71, the mounting steel plates 67 and 68, and the thick steel plates 64 and 65 provided for transmitting the horizontal force at the same time and enclosing the lead plug 69 in the through hole 66a of the laminated rubber body 66 are provided. It consists of bolts 73 and 74 to be tightened and holes 75 and 76 for attaching the mounting steel plates 67 and 68 to the upper and lower structures, and only the three reinforcing plates 63a are formed thicker than the other reinforcing plates 63. The

Reinforcing plate 63 is formed of a steel plate or the like, the thickness _{t s} of each of the three reinforcing plates 63a, in the same manner as mentioned _{above, t s ≧ 3.3t r / (} (σ m / σ c) -2) And The thickness of the other reinforcing plate 63 is the same as that of the reinforcing plate 83 of the conventional laminated rubber support 81 shown in FIG.

Similarly to the above embodiment, when the total thickness of the rubber layer 62 is T _R and the diameter of the laminated rubber body 66 is D, the total thickness T _S of the reinforcing plate 63 is T _S ≧ 26 × T _R ^XD-0.5 and set larger than the total thickness of the standard reinforcing plate. Further, the inner peripheral surface of each reinforcing plate 63 (including the three reinforcing plates 63 a) is in contact with the outer peripheral surface of the lead plug 69.

  Also in this embodiment, since the thickness of the three reinforcing plates 63a is increased and the total thickness of the reinforcing plates 63 is set to be thicker than before, the heat capacity is increased and the thickness is increased as in the above embodiment. Since the heat accumulated in the lead plug 69 can be efficiently released to the outside, the temperature rise of the lead plug 69 during a long-time earthquake can be suppressed. Thereby, since the performance of the laminated rubber bearing 61 at the time of a normal earthquake is not maintained, it is possible to suppress a decrease in the energy absorption performance of the laminated rubber bearing 61.

In the above embodiment, the case where the thicknesses of the reinforcing plates are all the same, or the case where the thicknesses of some of the reinforcing plates are made larger than the thicknesses of the other reinforcing plates, is exemplified in the present invention. , regardless of the thickness of the individual reinforcing plates, total thickness _{T S} of the reinforcing plate may be within a predetermined range (above _{T S ≧ 26 × T R ×} D -0.5).

  In the above embodiment, the reinforcing plate and the lead plug are brought into contact with each other. However, when a covering layer is formed on the reinforcing plate and the lead plug or in the vicinity thereof, the reinforcing plate and the lead plug are close to each other. Will be placed.

  In a preferred example, the damper plug is made of a damping material that absorbs vibration energy by plastic deformation, and the damping material is a superplastic alloy such as lead, tin, zinc, aluminum, copper, nickel, or a zinc-aluminum alloy. A lead-containing low melting point alloy (for example, a tin-containing alloy selected from a tin-zinc alloy, a tin-bismuth alloy, and a tin-indium alloy). And, specifically, a tin-bismuth alloy containing 42 to 43 wt% tin and 57 to 58 wt% bismuth), and in another preferred example, the absorption of vibration energy is plastic It is made of a damping material that flows by flow, and the damping material may contain a thermosetting resin and rubber powder. Specifically, for example, the added vibration is attenuated by mutual friction. A thermally conductive filler may include a graphite attenuate by friction at least thermally conductive filler vibrations to be added.

Further, in the above embodiment, the laminated rubber body has exemplified the case of viewed from the circular, when laminated rubber body is viewed from square, D in the formula _{T S ≧ 26 × T R ×} D -0.5 Indicates the length of one side, and in the case of a rectangle in a top view, indicates the length of the short side.

Furthermore, although the case where one lead plug is used as the attenuating body plug is illustrated, even when an attenuating body plug made of another material is used or when two or more attenuating body plugs are used, the reinforcing plate The total thickness T _S may be T _S ≧ 26 × T _R × D ^−0.5 .

  In addition, when the laminated rubber body and the attenuation body plug have the same area in a top view, the heat generation suppression effect in the attenuation body plug is higher in the case of a plurality of attenuation rubber plugs than in the case of one each.

When the thickness of the portion of the reinforcing plate is larger than the thickness of the other reinforcing plate, the aspect ratio of the shear portion of the damping body plug _(H / D p: H is the height of the shearing part, D _p is This has the effect of reducing the diameter of the sheared portion, and contributes to the stability of the hysteresis shape and the improvement of the heat dissipation characteristics. In the above embodiment, the attenuation body plug penetrates the thick reinforcing plate, but in this case, the height between the upper and lower thick steel plates does not become the height of the shearing portion, but is thicker with any of the upper and lower thick steel plates. The space between the reinforcing plates is the height of the shearing portion. On the other hand, when the attenuation body plug passes through the thick reinforcing plate and the thickness of the thick reinforcing plate is not sufficient, it cannot be said that the plug is divided vertically. As the range, when the diameter of the attenuator plug is D _p and the thickness of one thick reinforcing plate is t _S , it becomes about D _p / 5 ≦ t _S.

  Next, a test example of the laminated rubber bearing according to the present invention will be described.

  The laminated rubber support 81 shown in FIG. 5 was used as a comparative example, and the laminated rubber supports 1 and 21 shown in FIG. 1 and FIG. The detailed configuration of each laminated rubber bearing is shown in Table 1. The test conditions are shown in Table 2. In this test example, an experiment and an analysis were performed, and the analysis result was in good agreement with the experiment result. Therefore, the analysis result is shown as a test example below.

The test results are shown in Table 3. From the table, Examples 1 and 2 satisfy the above _{T S ≧ 26 × T R ×} D -0.5 each total energy absorption compared to the comparative example is increased 21%, 13.7%, It can be seen that the ratio of the yield stress at the end of the test to the initial yield stress is 6.9% and 5.7% larger, respectively.

  Next, when the above-mentioned laminated rubber bearings 1, 21, and 41 were tested using the Tokai / Tonankai earthquake using the Tokai region long-period ground motion three round waves, the results shown in Table 4 were obtained. From the table, Example 1 and Example 2 increase the total energy absorption by 13.5% and 8.2%, respectively, compared with the comparative example, and the ratio of the yield stress at the end of the test to the initial yield stress is 8 respectively. 3%, 4.7% larger.

  As described above, from the test results, according to the laminated rubber bearing according to the present invention, while maintaining the performance at the time of a normal earthquake, the decrease in the energy absorption performance at the time of a long-time earthquake is suppressed.

DESCRIPTION OF SYMBOLS 1 Laminated rubber support 2 Rubber layer 3 Reinforcement plate 4 Upper thick steel plate 5 Lower thick steel plate 6 Laminated rubber body 6a Through hole 7 Upper mounting steel plate 8 Lower mounting steel plate 9 Lead plug 10 Upper shear key 11 Lower shear Keys 13 and 14 Bolts 15 and 16 Hole 21 Laminated rubber support 22 Rubber layers 23 and 23a Reinforcement plate 24 Upper thick steel plate 25 Lower thick steel plate 26 Laminated rubber body 26a Through hole 27 Upper mounting steel plate 28 Lower mounting steel plate 29 Lead plug 30 Upper shear key 31 Lower shear key 33, 34 Bolt 35, 36 Hole 41 Laminated rubber support 42 Rubber layers 43, 43a Reinforcement plate 44 Upper thick steel plate 45 Lower thick steel plate 46 Laminated rubber body 46a Through hole 47 Upper mounting steel plate 48 Lower mounting steel plate 49 Lead plug 50 Upper shear key 51 Lower shear key 53, 54 Bolt 55, 56 Hole 61 Laminated rubber bearing 62 Layer 63, 63a Reinforcement plate 64 Upper thick steel plate 65 Lower thick steel plate 66 Laminated rubber body 66a Through hole 67 Upper mounting steel plate 68 Lower mounting steel plate 69 Lead plug 70 Upper shear key 71 Lower shear key 73, 74 Bolt 75, 76 holes

Claims (9)

Lamination comprising: a laminated rubber body having at least one through-hole penetrating in a vertical direction in a laminated rubber portion in which rubber layers and reinforcing plates are alternately laminated; and at least one damping body plug enclosed in the through-hole. In rubber bearings,
The total thickness of the reinforcing plate is T _S , the total thickness of the rubber layer is T _R , the diameter when the laminated rubber body is circular when viewed from above, the length of one side when it is square when viewed from above, or the upper surface in the case of viewing a rectangle when the length of the short side has is D, a _{T S ≧ 26 × T R ×} D -0.5,
A laminated rubber bearing, wherein an inner peripheral surface of each of the reinforcing plates and an outer peripheral surface of the attenuation body plug are disposed in contact with or close to each other.   The laminated rubber bearing according to claim 1, wherein each of the reinforcing plates has the same thickness.   The laminated rubber bearing according to claim 1, wherein a part of the reinforcing plate is thicker than other reinforcing plates having the same thickness.   4. The laminated rubber bearing according to claim 3, wherein the part of the reinforcing plates is a single reinforcing plate located in a vertically central portion of the attenuation body plug.   4. The laminated structure according to claim 3, wherein the partial reinforcing plates are a plurality of reinforcing plates that are separated from each other via at least one other reinforcing plate in the vertical direction of the attenuation body plug. Rubber bearing.   The laminated rubber bearing according to any one of claims 1 to 5, wherein the damping plug is made of a damping material that absorbs vibration energy by plastic deformation.   The laminated rubber bearing according to claim 6, wherein the damping material is made of lead, tin, zinc, aluminum, copper, nickel, an alloy thereof, or a non-lead-based low melting point alloy.   The laminated rubber bearing according to claim 1, wherein the damping plug is made of a damping material that absorbs vibration energy by plastic flow.   The laminated rubber bearing according to claim 8, wherein the damping material includes a thermosetting resin and rubber powder.

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