JP2005188546A - Base isolation structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a base isolation structure having improved adhering performance between a connection steel plate or a reinforcing steel plate and a weatherproof rubber to sufficiently endure stress and external environment arising on an interface therebetween. <P>SOLUTION: The base isolation structure 11 comprises the upper side connection steel plate 12, the lower side connection steel plate 13, rubber layers 14 and internal steel plates 15 alternately arranged therebetween, the weatherproof rubber 16 covering the side faces thereof, and a well adhesive rubber 17 laid between the connection steel plates 12, 13 and the weatherproof rubber 16 in a well adhesive manner. The well adhesive rubber 17 is turned around into recessed portions 12a, 13a of the connection steel plates 12, 13. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a base isolation structure in which a plurality of hard plates and soft plates having viscoelastic properties are alternately bonded, and particularly to a base isolation structure having extremely excellent weather resistance.

  A structure in which a hard plate such as a steel plate and a soft plate having viscoelastic properties such as rubber are laminated is widely used as a support member that requires vibration-proofing properties, vibration-absorbing properties, and the like.

  Since the seismic isolation structure used for such a support member is inserted between the building and the base and functions to support the entire building, it is difficult to replace it once it has been installed. Even if it is technically replaceable, the cost is considerably high. For this reason, the seismic isolation structure is required to have a durability life of 50 to 60 years, which is the same as that of a concrete structure.

  By the way, since the seismic isolation structure is always exposed to the outside air during use, it is subject to long-term deterioration due to air, humidity, ozone, ultraviolet rays, radiation for nuclear power, and sea breeze at the seaside. Further, since the building is supported, it is always subjected to a compressive load, and a considerable tensile stress is applied to the surface portion of the rubber layer even in normal times. In addition, when a large earthquake occurs, the rubber layer is locally subjected to a tensile strain of 100 to 200%. Deterioration further proceeds due to such tensile stress and tensile strain.

  For this reason, in seismic isolation structures that require a long durability, the outer periphery can be covered with weathering rubber in order to improve the weather resistance such as oxidation resistance, ozone resistance, and heat aging resistance. This is described in Japanese Patent Publication No. 7-29394.

  Generally, steel plates (connected steel plates or reinforced steel plates) are arranged at the uppermost and lowermost parts of the seismic isolation structure. In the sliding support type seismic isolation structure, a highly slidable resin plate such as a fluororesin, for example, polytetrafluoroethylene (PTFE) is fixed to the upper surface of the reinforcing steel plate.

FIG. 4 is a longitudinal sectional view showing a conventional example of a seismic isolation structure in which connecting steel plates are arranged at the uppermost part and the lowermost part and the side peripheral surfaces are covered with weatherproof rubber. In this seismic isolation structure 1, the connecting steel plates 2 and 3 are disposed at the uppermost and lowermost portions, the rubber layers 4 and the inner steel plates 5 are alternately disposed therebetween, and the side peripheral surface is covered with the weather resistant rubber 6. It has been done.
Japanese Patent Publication No. 7-29394

  The seismic isolation structure is subjected to external forces such as shearing force, compressive force, and rotational force, but stress due to these external forces concentrates on the interface between the connecting steel plates 2 and 3 and the weather resistant rubber 6.

  Further, when the upper and lower surfaces of this seismic isolation structure are not lined, the interface is directly exposed to the outside air, and is easily affected by salt water and wet heat.

  The present invention provides a seismic isolation structure having improved adhesion performance between a connection steel plate or a reinforcing steel plate and weather resistant rubber, and having sufficient adhesion performance to withstand stress and external environment generated at the interface between the two. With the goal.

  The seismic isolation structure of the present invention (Claim 1) includes a laminate in which rubber layers and internal steel plates are alternately arranged between an upper steel plate and a lower steel plate, and a weather resistance covering a side surface of the laminate. In the seismic isolation structure having rubber, an intermediate material excellent in adhesion to both is interposed between the upper and lower steel plates and the weather resistant rubber. .

  The seismic isolation structure according to claim 2 is characterized in that, in claim 1, the intermediate material is good adhesive rubber.

  According to a third aspect of the present invention, the seismic isolation structure according to the second aspect is characterized in that the good adhesive rubber is attached to the side surfaces of the upper and lower steel plates.

  The seismic isolation structure according to claim 4 is the seismic isolation structure according to claim 3, wherein the good adhesive rubber is further attached to at least one of an upper surface edge of the upper steel plate and a lower surface edge of the lower steel plate. It is a feature.

  The seismic isolation structure according to claim 5 is the seismic isolation structure according to claim 4, wherein at least one of the upper surface edge of the upper steel plate and the lower surface edge of the lower steel plate is a recess, and the good adhesive rubber is the recess. It is characterized by being arranged.

  A seismic isolation structure according to a sixth aspect is characterized in that, in the fifth aspect, the good adhesive rubber in the recess is covered with a weather resistant rubber.

  The seismic isolation structure according to claim 7 is the seismic isolation structure according to any one of claims 2 to 6, wherein the good adhesive rubber is further covered on at least one of the lower surface edge of the upper steel plate and the upper surface edge of the lower steel plate. It is characterized by being worn.

  The seismic isolation structure according to claim 8 is the seismic isolation structure according to any one of claims 2 to 7, wherein the good adhesive rubber is at least one selected from the group consisting of natural rubber, styrene butadiene rubber and butadiene rubber. It is characterized by.

  In the seismic isolation structure of the present invention, since an intermediate material having excellent adhesion to both is interposed between the steel plate (connected steel plate or reinforced steel plate) and the weather resistant rubber, the connected steel plate or reinforced steel plate and the weather resistant material are interposed. Adhesive strength with strong rubber and excellent durability.

  As the intermediate material, rubber with good adhesion, particularly natural rubber, styrene butadiene rubber or butadiene rubber is suitable.

  In manufacturing the seismic isolation structure, it is preferable that this good adhesive rubber is previously attached to the side surface of the connecting steel plate or the reinforcing steel plate.

  By attaching this good adhesive rubber to the upper surface edge of the upper steel plate and the lower surface edge of the lower steel plate, the environment resistance of the interface between the steel plate and the weather resistant rubber (for example, salt water resistance, heat and moisture resistance) Will improve.

  In this case, by providing a recess in the upper surface edge of the upper steel plate or the lower surface edge of the lower steel plate and arranging the good adhesive rubber in the recess, the good adhesive rubber is seismically isolated. This is suitable because it does not protrude from the upper and lower surfaces of the plate. In particular, by adopting a configuration in which the good adhesive rubber in the recess is covered with the weather resistant rubber, the environmental resistance characteristics of the good adhesive rubber itself are also improved.

  By making this good adhesive rubber further adhere to the lower surface edge of the upper steel plate and the upper surface edge of the lower steel plate, the bond between the good adhesive rubber and the connecting steel plate becomes strong.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 (a) is a longitudinal sectional view of a seismic isolation structure according to an embodiment of the present invention (however, only the right half is shown. Since the left half appears symmetrically with the right half, it is omitted). FIG. 1 (b) is an enlarged view of part B of FIG. 1 (a).

  The seismic isolation structure 11 includes an upper connecting steel plate 12, a lower connecting steel plate 13, rubber layers 14 and internal steel plates 15 arranged alternately between the two, and a weather resistant rubber 16 covering the side surfaces thereof. And a good adhesive rubber as an intermediate material having good adhesiveness, which is interposed between the connecting steel plates 12 and 13 and the weather resistant rubber 16. The connecting steel plates 12 and 13 and the internal steel plate 15 are preferably vulcanized and bonded to the rubber layer 14.

  Recesses 12a, which are slightly recessed (for example, about 1 to 5 mm) at the upper surface edge of the upper connecting steel plate 12 and the lower surface edge of the lower connecting steel plate 13, respectively, from the upper surface of the connecting steel plate 12 and the lower surface of the connecting steel plate 13. 13a is formed, the good adhesive rubber 17 extends into the recesses 12a and 13a, and is arranged so as to be substantially flush with the upper surface of the connecting steel plate 12 and the lower surface of the connecting steel plate 13. Yes. The upper corner edge of the upper connecting steel plate 12 and the lower corner edge of the lower connecting steel plate 13 are obliquely chamfered.

  In this embodiment, the lower surface edge of the upper connecting steel plate 12 and the upper surface edge of the lower connecting steel plate 13 are also covered with the weather resistant rubber 16.

  The plan view shape of the seismic isolation structure is arbitrary, such as a circle, an ellipse, a quadrangle, or a pentagon or more.

  Examples of the rubber constituting the rubber layer 14 include natural rubber, chloroprene rubber, butadiene rubber, styrene butadiene rubber, and ethylene propylene rubber, but are not limited thereto. Examples of the weather resistant rubber 16 include, but are not limited to, butyl rubber, polyurethane, ethylene propylene rubber, ethylene vinyl acetate rubber, and the like.

  The good adhesive rubber 17 as the intermediate material is preferably at least one of natural rubber, styrene butadiene rubber, and butadiene rubber, but is not limited thereto. The thickness of the good adhesive rubber 17 is preferably about 0.5 to 10 mm, particularly about 1 to 5 mm, but is not limited thereto.

  In the seismic isolation structure configured as described above, since the good adhesive rubber 17 is interposed between the connecting steel plates 12 and 13 and the weather resistant rubber 16, the connecting steel plates 12 and 13 and the weather resistant rubber are provided. Adhesion with 16 is strong and excellent in durability.

  In particular, in this embodiment, the good adhesive rubber 17 wraps around the upper surface edge of the upper connecting steel plate 12 and also wraps around the lower surface edge of the lower connecting steel plate 13. And the environmental resistance of the interface between the weather resistant rubber 16 is good.

  Furthermore, in this embodiment, since the good adhesive rubber 17 also wraps around the lower surface edge of the upper connecting steel plate 12 and the upper surface edge of the lower connecting steel plate 13, it is connected to the good adhesive rubber 17. Bonding with the steel plates 12 and 13 is strong.

  FIG. 2 is a partial cross-sectional view of a seismic isolation structure 11A according to another embodiment of the present invention, and shows a cross-section at the same place as in FIG. 1 (b).

  In this embodiment, the point that the good adhesive rubber 17 wraps around the recesses 12a and 13a of the connecting steel plates 12 and 13 (the connecting steel plate 13 is not shown) is the same as the embodiment of FIG. Although the same, the thickness of the good adhesive rubber 17 in the recesses 12a and 13a is smaller than the depth of the recesses 12a and 13a. The good adhesive rubber 17 in the recesses 12 a and 13 a is covered with a weather resistant rubber 16.

  The effect similar to that of the seismic isolation structure 11 can be obtained by the seismic isolation structure 11A. Moreover, in this seismic isolation structure 11A, the outer surface edge part of the connection steel plates 12 and 13 is also covered with the weather resistant rubber 16, and the environmental resistance of the side surface of the connection steel plates 12 and 13 and the weather resistant rubber 16 is provided. Is very good. In addition, the good adhesion rubber 17 is interposed between the weather resistant rubber 16 and the connecting steel plates 12 and 13 at the upper edge of the connecting steel plate 12 and the lower edge of the connecting steel plate 13, and the adhesion between the two is less. Extremely strong.

  FIG. 3 is a partial cross-sectional view of an embodiment in which the present invention is applied to a sliding support type seismic isolation structure, and shows a cross-section at the same location as in FIG. 1 (a).

  In the seismic isolation structure 21 according to this embodiment, the reinforcing steel plate 22 is disposed at the upper portion, the connecting steel plate 23 is disposed at the lower portion, and the rubber layers 24 and the internal steel plates 25 are alternately laminated between the two. Has been placed. The reinforcing steel plate 22, each internal steel plate 25 and the connecting steel plate 23 are preferably vulcanized and bonded to the rubber layer 24. A side surface of the laminate from the reinforcing steel plate 22 to the connecting steel plate 23 is covered with a weather resistant rubber 26.

  A highly slidable plate (PTFE plate 28 in this embodiment) made of fluororesin or the like is fixed to the upper surface of the reinforcing steel plate 22.

  A good adhesive rubber 27 is interposed as an intermediate material between the side surfaces of the reinforcing steel plate 22 and the connecting steel plate 23 and the weather resistant rubber 26. In this embodiment, the good-adhesive rubber 27 has wrapped around the upper surface edge and the lower surface edge of the reinforcing steel plate 22 and the connecting steel plate 23.

  Further, as in FIG. 2, a weather resistant rubber 26 is applied to the upper surface edge of the connecting steel plate 23. A lining rubber 29 is attached to the lower surface of the connecting steel plate 23.

  Also in the seismic isolation structure 21 configured as described above, the adhesion between the weather resistant rubber 26, the reinforcing steel plate 22 and the connecting steel plate 23 is good, and the seismic isolation structure 21 is excellent in durability. . Further, since the good adhesive rubber 27 is also attached to the upper surface edge and the lower surface edge of the reinforcing steel plate 22 and the connecting steel plate 23, the adherence of the good adhesive rubber 27 to the steel plates 22 and 23 is also good. It is.

  Each of the above embodiments is an example of the present invention, and the present invention can take forms other than those shown in the drawings.

It is sectional drawing of the seismic isolation structure which concerns on embodiment. It is sectional drawing of the seismic isolation structure which concerns on another embodiment. It is sectional drawing of the seismic isolation structure which concerns on another embodiment. It is sectional drawing of the seismic isolation structure which concerns on a prior art example.

Explanation of symbols

1,11,11A, 21 Base-isolated structure 2,3,12,13 Connection steel plate 12a, 13a Recess 4,14,24 Rubber layer 5,15,25 Internal steel plate 6,16,26 Weather resistant rubber 17,27 Good adhesion rubber 22 Reinforced steel plate

Claims (8)

  In a seismic isolation structure having a laminate in which rubber layers and internal steel plates are alternately arranged between an upper steel plate and a lower steel plate, and a weather resistant rubber covering the side surface of the laminate, A base-isolated structure characterized in that an intermediate material excellent in adhesion to both is interposed between a steel plate on the side and the weather resistant rubber.   The seismic isolation structure according to claim 1, wherein the intermediate material is a good adhesive rubber.   3. The seismic isolation structure according to claim 2, wherein the good adhesive rubber is attached to the side surfaces of the upper and lower steel plates.   4. The seismic isolation structure according to claim 3, wherein the good adhesive rubber is further attached to at least one of an upper surface edge of the upper steel plate and a lower surface edge of the lower steel plate.   5. The method according to claim 4, wherein at least one of the upper surface edge of the upper steel plate and the lower surface edge of the lower steel plate is a recess, and the good adhesive rubber is disposed in the recess. Seismic isolation structure.   6. The seismic isolation structure according to claim 5, wherein the good adhesive rubber in the recess is covered with weather resistant rubber.   7. The exemption according to claim 2, wherein the good adhesive rubber is further applied to at least one of a lower surface edge of the upper steel plate and an upper surface edge of the lower steel plate. Seismic structure.   The seismic isolation structure according to any one of claims 2 to 7, wherein the good adhesive rubber is at least one selected from the group consisting of natural rubber, styrene butadiene rubber, and butadiene rubber.

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