JP2006349049A - Base isolation supporting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an improved base isolation supporting device having a simple structure, although the device functions as a trigger securely, and capable of dispensing with its replacement as a mechanism and constituting it comparatively inexpensively. <P>SOLUTION: In this base isolation supporting device constituted by providing a base isolation mechanism M allowing relative rolling of a building 1 and a foundation part 2 for base isolation between the building 1 and its foundation part 2 and providing a trigger mechanism T functioning to regulate or prevent relative rolling of the building 1 and the foundation part 2 until force in the horizontal direction accompanying with rolling exceeds a predetermined scope, the trigger mechanism T is composed of a first member B1 attached to the building 1, a second member B2 attached to the foundation part 2, and a trigger member 6 fixed across these first and second members B1, B2, connecting both of these members B1, B2 mutually, and made of high damping rubber. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a seismic isolation bearing device for seismically isolating a building such as a house or a building, and more specifically, a relative roll between the building and the foundation is provided between the building and the foundation. A seismic isolation mechanism that allows seismic isolation is installed, and the relative roll between the building and the foundation is restricted or prevented until the horizontal force that accompanies the roll exceeds a predetermined range. The present invention relates to a seismic isolation bearing device equipped with a trigger mechanism that functions as follows.

  As this type of seismic isolation bearing device, those disclosed in Patent Literature 1 and Patent Literature 2 are known. The trigger mechanism shown in Patent Document 1 regulates rolling by supporting the lower end of the building with an L-shaped restraint material that is normally supported by a pillar member, and the pillar member collapses during an earthquake and the L-type restraint material It is means for switching to a seismic isolation state in which the seismic isolation device functions by rotating downward and releasing the trigger function. In other words, in the event of a strong wind such as a typhoon, the trigger mechanism prevents the building from being inadvertently shaken, but in the event of an earthquake, the trigger mechanism is automatically released to switch to a seismic isolation state.

  Moreover, the trigger mechanism shown in Patent Document 2 is usually in a state in which the relative roll is controlled by providing an engaging member that is inserted between the building and the foundation. It is a means for removing the engaging member from the building by a holding release mechanism activated by operation, and switching the seismic isolation device to a seismically isolated state. In this means, a manual operation lever for artificially releasing operation in the event of a power failure, etc. Means for switching to is provided.

  In the former (Patent Document 1), once a strong shaking due to an earthquake or the like occurs and the trigger mechanism functions, the trigger mechanism must be replaced and refurbished. At the same time, it seems unsatisfactory in terms of cost disadvantages. In the latter means (Patent Document 2), the accuracy of the control for switching to the seismic isolation state is left to the performance of the earthquake detection means, but the earthquake detection means itself having an excellent detection function becomes expensive and has a structure. Is relatively complicated and has a lot of sliding parts, so there is some concern about whether or not it will function quickly and reliably as a system.

There are also known techniques for preventing excessive rolls that cause problems such as damage to the foundation support of a building, that is, seismic isolation bearing devices having a movement limiting mechanism. For example, Patent Document 3 and Patent Document 4 Are disclosed. Although these patent documents 3 and 4 are means comprised by constructing a wire and a rope over a building and a foundation part, the subject about the rust prevention and durability of these wires and a rope is solved. It is uncertain whether it will function well as a movement limiting mechanism during earthquakes and strong winds.
JP 2003-232141 A JP 2000-154669 A JP 2003-227245 A Japanese Patent Laid-Open No. 11-293952

  The object of the present invention is to revise and devise the structure of the trigger mechanism, so that it can function reliably as a trigger, but the structure is simple, there is no need for replacement as a mechanism, and it can be constructed at a relatively low cost. Thus, the above-described problems are eliminated, and an improved seismic isolation bearing device is provided. It is another object of the present invention to provide a movement limiting mechanism that prevents excessive rolls in a state that can function reliably but can be configured at low cost.

In the invention according to claim 1, a seismic isolation mechanism M is provided between the building 1 and the foundation portion 2 to allow a relative roll between the building 1 and the foundation portion 2 to be isolated. In addition, a trigger mechanism T that functions to restrict or prevent relative roll between the building 1 and the foundation 2 is provided until the horizontal force accompanying the roll exceeds a predetermined range. In the seismic isolation bearing device,
The trigger mechanism T is fixed across the first member B1 attached to the building 1, the second member B2 attached to the foundation 2, and the first and second members B1 and B2. It is characterized by comprising a trigger member 6 made of high-damping rubber that connects these members B1 and B2.

  The invention according to claim 2 is the seismic isolation bearing device according to claim 1, wherein either one of the first member B1 and the second member B2 is formed in a cylindrical cylinder 15. The trigger member 6 is internally fitted and fixed, and a piston rod 8 inserted and fixed to the trigger member 6 is formed on the other of the first member B1 and the second member B2. To do.

  The invention according to claim 3 is the seismic isolation bearing device according to claim 2, wherein the end walls 15b, 15c for closing both ends of the cylinder 15 are formed, and one of the end walls 15b, 15c is The piston rod 8 is configured by an end wall 15b with a hole 15e through which the piston rod 8 is movably inserted, and is fixed to the tip of the piston rod 8 and the opposite side thereof inside the cylinder 15. The distal end side locking piece 12 and the root side locking piece 13 are provided, the abutment between the end wall 15c and the distal end side locking piece 12, and the holed end wall 15b and the root side locking piece 13 The movement restricting mechanism L that defines the relative movement limit of the cylinder 15 and the piston rod 8 in both the pushing and pulling directions is configured by the contact of the cylinder 15 and the piston rod 8.

  The invention according to claim 4 is the seismic isolation bearing device according to claim 3, wherein the end wall 15c and the distal end side locking piece 12 and / or the holed end wall 15b and the root side locking are provided. An elastic body 17 is interposed between the piece 13 and the piece 13.

  The invention according to claim 5 is the seismic isolation bearing device according to claim 4, wherein the elastic body 17 is made of high-damping rubber.

  The invention according to claim 6 is the seismic isolation bearing device according to any one of claims 1 to 5, wherein the first member B1 and the building 1 are connected via a universal joint 9, and the The second member B2 and the base portion 2 are connected via a universal joint 16.

  According to the first aspect of the present invention, the trigger mechanism is formed by a simple structure in which a trigger member made of high-attenuation rubber straddling the first member on the building side and the second member on the foundation side is provided, which will be described in detail later. However, due to the characteristics of the high damping rubber having high Geq with low Geq in the low strain region, the trigger member is not displaced (deformed) with respect to normal level roll, and the first member and the second member The function of maintaining the relative posture (state maintaining function), that is, the trigger function is exhibited. Then, the trigger member smoothly displaces (deforms) during strong winds or earthquakes caused by typhoons, so that the seismic isolation mechanism functions and an effective seismic isolation action against rolling can be obtained. In addition, due to the characteristics of the high damping rubber having high Heq, it is possible to exhibit a function of damping the relative movement between the building and the foundation, that is, a damper function.

  As a result, the structure of the trigger mechanism has been reviewed and devised to eliminate conventional problems, and while it functions reliably as a trigger, the structure is simple, there is no need for replacement as a mechanism, and relatively It is possible to provide an improved seismic isolation bearing device that can be configured at low cost and can be configured and equipped at a low price while being able to function reliably, while the movement limiting mechanism that prevents excessive rolls can function reliably. .

  According to the invention of claim 2, since the trigger mechanism is configured in a cylinder structure, the first member and the second member can be smoothly moved relative to each other and can be made compact. And since the trigger member, which is a movable part, and its peripheral part are built in the cylinder and are not exposed to the outside, it functions reliably without the risk of dust and other objects adhering to it and malfunctions caused by it, and it is also durable. Excellent advantages are also obtained.

  According to the invention of claim 3, the movement restriction that restricts (regulates) excessive movement of the cylinder and the piston rod in both the pushing and pulling directions by contact between the both end walls of the cylinder and the pair of locking pieces of the piston rod. The mechanism is configured. This can be easily configured by using a trigger mechanism having a cylinder structure, and has an advantage that the addition of a movement limiting mechanism can be achieved economically.

  According to the invention of claim 4, the operation of the movement restricting mechanism for restricting excessive rolling of the building and the foundation by simply adding an elastic body to each of the two locations described above. It is possible to provide a shock absorber function to alleviate the impact of contact at the time. In other words, by using the fact that the trigger mechanism has a cylinder structure, it is possible to obtain an advantage that a shock absorber can be provided at a low cost with a simple structure. In this case, as in the fifth aspect, the elastic body can be made of high damping rubber.

  According to the invention of claim 6, since both the building and the foundation are universally coupled to the trigger mechanism, the building and the foundation are twisted or twisted even when the building and the foundation are rolled horizontally and vertically. The trigger mechanism can be functioned smoothly without any problems, and the effects can be exhibited as expected.

  Embodiments of the seismic isolation bearing device according to the present invention will be described below with reference to the drawings. FIG. 1 is a partially cutaway side view showing the structure of a seismic isolation bearing device according to the first embodiment, FIG. 2 is an operation diagram showing a trigger mechanism at the maximum tension, and FIG. 3 is an operation diagram showing a trigger mechanism at the maximum push-in. It is. FIG. 4 shows another trigger mechanism.

[Example 1]
FIG. 1 shows a seismic isolation device A composed of a seismic isolation mechanism M and a trigger mechanism T. That is, seismic isolation is performed between the mounting portion 1a of the building 1 such as a house or a building and the mounting portion 2a of the base portion 2n, allowing the relative roll of the building 1 and the base portion 2 to be isolated. While the mechanism M is interposed, a trigger mechanism T that functions to restrict or prevent relative roll between the building 1 and the foundation 2 until the horizontal force due to roll exceeds a predetermined range. Is installed and the seismic isolation bearing device A is configured.

  The seismic isolation mechanism M is not particularly limited. As an example, the upper flange plate 3 on the building side, the lower flange plate 4 on the foundation side, the elastic portion such as rubber, and the hard member such as steel plate are alternately turned up and down. And a laminated rubber comprising a laminated portion 5 formed by laminating a plurality of layers. As the rubber of the laminated portion 5, natural rubber, synthetic rubber or the like, preferably high damping rubber can be used.

  The trigger mechanism T is fixed across the first member B1 attached to the building 1, the second member B2 attached to the base 2, and the first and second members B1 and B2. It is comprised from the trigger member 6 which consists of high damping rubber which connects B1 and B2. The first member B1 includes a piston rod 8 that is attached to a suspension member 7 that is fixed in a suspended state on the bottom surface 1s of the building 1 via a universal joint 9 such as a ball joint. The piston rod 8 includes a rod portion 11 made of a rod material fixed to the universal joint 9 and a circular shape that is fixed to the rod portion 11 while being fitted in a cylinder 10 (described later). It consists of moving rings 12 and 13.

  The second member B <b> 2 is composed of a cylinder 15 through which the piston rod 8 is inserted. The cylinder 15 has a rod-like member 15d attached to a support member 14 standingly fixed to the base portion 2 via a universal joint 16 such as a ball joint, a main body cylinder 15a, and a circular hole 15e through which the piston rod 8 can be inserted. It is comprised from the end wall 15b with a hole of the front end side formed in this, and the end wall 15c of the root side. The cylinder 15 and the piston rod 8 are given weather resistance by rust prevention coating, plating treatment, and the like.

  The substantially cylindrical trigger member 6 is attached to the inner peripheral surface of the body cylinder 15a of the cylinder 15 by vulcanization adhesion or the like, and is also attached to the rod portion 11 of the piston rod 8 by vulcanization adhesion or the like. . In this attached state, as shown in FIG. 1, the gap a between the holed end wall 15b and the root side sliding ring (an example of the root side locking piece) 13, the root side sliding ring 13 and the trigger member 6, a gap b between the right end face of the trigger member 6, a gap c between the left end face of the trigger member 6 and the tip side sliding ring (an example of the tip side locking piece) 12, and the tip side sliding ring 12 and the root side The gaps d between the first and second end walls 15c are set to have equal lengths (a = b = c = d).

  When a strong lateral force (rolling) is caused by a strong wind or an earthquake caused by a typhoon, for example, when the building 1 moves to the right side with respect to the foundation 2 in FIG. 1, as shown in FIG. The trigger member 6 is deformed so that the central portion thereof is shifted to the right (to the first member B1 side), the base side sliding ring 13 is in contact with the holed end wall 15b, and the building 1 is further connected to the base portion 2. However, it will be restricted so that it cannot move sideways (sway) to the right. In the maximum right displacement state, a gap (d + a) is formed between the tip-side sliding ring 12 and the root-side end wall 15c.

  In addition, when the building 1 moves to the right side with respect to the base portion 2 in FIG. 1 due to strong roll, as shown in FIG. 3, the trigger member 6 has its center portion left (second member B2). The tip side sliding ring 12 abuts against the end wall 15c, and the building 1 is restricted so that it cannot move laterally (roll) to the left with respect to the base portion 2. The trigger mechanism T functions. That is, the trigger mechanism T having a structure in which these abutments are performed also functions as a lateral movement restriction mechanism L with respect to the base portion 2 of the building 1. In this left maximum displacement state, a gap (a + d) is formed between the holed end wall 15 b and the root side sliding ring 13.

  Therefore, the seismic isolation bearing device A is controlled so that the state keeping function by the trigger mechanism T acts on some winds and shakes so that the building 1 does not roll unintentionally, and strong winds and earthquakes caused by typhoons. In some cases, the state holding function of the trigger mechanism T is canceled and the seismic isolation mechanism M is switched to the seismic isolation state, so that an effective seismic isolation action (roll absorption action) is exhibited. The trigger mechanism T is constructed with a high damping rubber built-in cylinder structure with a movement restriction function, so it can function reliably as a trigger, but it is simple in structure and does not require replacement as a mechanism. The movement limiting mechanism L that prevents excessive rolls can be configured at a low cost while functioning reliably.

  High damping rubber has a characteristic that Geq (equivalent shear modulus) is high in the low strain region and Geq is low in the high strain region, so that a normal strength wind blows or a dump truck passes nearby. For example, a function in which the building 1 does not substantially roll with respect to the foundation portion 2, that is, a trigger function, is exerted in response to a normal shaking caused by daily life. When a strong external force exceeding a normal range, such as a strong wind such as a typhoon or an earthquake, is applied, the trigger member 6 is smoothly deformed, so that the seismic isolation function by the seismic isolation mechanism M is not impaired. It is possible to make the state appear as it is.

  In addition, since the high damping rubber has a high heq (equivalent viscosity damping coefficient), the trigger mechanism T also exhibits a damper function. That is, the deformation of the trigger member 6 at the time of switching from the basic state shown in FIG. 1 to the deformed state shown in FIGS. 2 and 3 is accompanied by viscosity, thereby damping the relative lateral movement of the piston rod 8 and the cylinder 15. This is because the intended action occurs. The trigger mechanism T according to the present embodiment is made of steel except that the trigger member 6 is a rubber material, and has an advantage of being cheaper than a general oil damper.

  Incidentally, as indicated by phantom lines in FIG. 1, it is advantageous to provide an elastic body (bump stop) 17 made of an elastic material on the inner surfaces of the end walls 15b with holes and the end walls 15c. An elastic body 17 made of general rubber, high damping rubber, elastomer, EPDM, various synthetic resins or the like is provided between the end wall 15b with a hole and the base side sliding ring 13 or / and the end wall 15c and the front side sliding ring. 2 and 3, the contact between the metal materials when the movement is restricted as shown in FIGS. 2 and 3 becomes the contact between the metal material and the elastic body, and also functions as a shock absorber. It becomes possible to make it. As a result, the shock at the time of restricting the movement of the building is alleviated, and there is an advantage that the risk of noise, deformation and damage due to direct contact between the cylinder 15 and the piston rod 8 can be avoided.

[Another Example]
For example, as shown in FIG. 4, the first member B1 on the building 1 side is connected to the hanging member 7, the base material 27 pivotally connected thereto, a plurality of recumbent plate materials 21, and the plate materials 21 and 27. And a second member B2 on the base portion 2 side, the support member 14, a base material 25 pivotally connected to the support member 14, a plurality of recumbent plate members 23, and It has a connecting member 24 that pivotally connects the plate member 23 and the base member 25, and is highly attenuated by vulcanization adhesion or the like between adjacent members of the plate members 21, 23 that are alternately stacked on top and bottom. A trigger mechanism T having a structure in which a rubber trigger member 26 is interposed may be used. In this case, if a stopper 28 capable of coming into contact with the outer surface of the connecting member 24 is attached to the top ends of the upper and lower plate members 21, the contact between the connecting member 24 and the stopper 28 and the contact between the plate member 23 and the connecting member 22 occur. The movement limiting mechanism L is configured to limit the lateral movement of the first member B1 and the second member B2 in both pushing and pulling directions.

  Further, in the gaps a, b, c, and d in FIG. 1, if a ≦ c and d ≦ b are established, the sliding rings 12 and 13 are moved to the trigger member 6 in the left and right maximum displacement states. It does not cause inconvenience of damaging it and can function smoothly. From the viewpoint of displacement balance, it is preferable to set a = d, but a ≠ d may also be used.

Side view of partially cut-out showing structure of seismic isolation equipment (Example 1) Action diagram showing trigger mechanism with maximum displacement in tension direction Action diagram showing trigger mechanism with maximum displacement in pushing direction Side view of the main part showing another structure of trigger mechanism

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Building 2 Base part 6 Trigger member 8 Piston rod 9, 16 Universal joint 12 End side locking piece 13 Root side locking piece 15 Cylinder 15b End wall with hole 15c End wall 15e Hole 17 Elastic body A Seismic isolation device B1 1st 1 member B2 2nd member L Movement restriction mechanism M Seismic isolation mechanism T Trigger mechanism

Claims (6)

Between the building and its foundation, an isolation mechanism is installed that allows the base roll to sway relative to the building and the foundation, and the horizontal force associated with the roll is predetermined. Until exceeding the range, a seismic isolation device equipped with a trigger mechanism that functions to regulate or prevent relative roll between the building and the foundation,
The trigger mechanism includes a first member attached to the building, a second member attached to the foundation, and a high-damping rubber that is fixed across the first and second members to connect the two members together. A seismic isolation bearing device comprising a trigger member consisting of   Either one of the first member and the second member is formed in a cylindrical cylinder, and the trigger member is fitted and fixed to the cylinder, and a piston rod inserted and fixed to the trigger member is provided in the first cylinder. The seismic isolation bearing device according to claim 1, wherein the seismic isolation bearing device is formed on either one of the one member and the second member.   To form end walls that close both ends of the cylinder, one of the end walls is formed as an end wall with a hole in which a hole through which the piston rod is movably inserted is formed. Provided with a tip side locking piece and a base side locking piece fixed to the tip part of the piston rod and the opposite side part thereof, and contact between the end wall and the tip side locking piece and the hole 3. The relief according to claim 2, wherein a movement limiting mechanism for defining a relative movement limit of the cylinder and the piston rod in both pushing and pulling directions is configured by contact between the attached end wall and the root side locking piece. Seismic bearing device.   The seismic isolation bearing device according to claim 3, wherein an elastic body is interposed between the end wall and the distal end side locking piece and / or between the holed end wall and the root side locking piece. .   The seismic isolation bearing device according to claim 4, wherein the elastic body is made of high damping rubber. The said 1st member and the said building are connected via a universal joint, and the said 2nd member and the said base part are connected via a universal joint. Seismic isolation device.

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