JP5326779B2 - Seismic isolation device - Google Patents

Description

  The present invention relates to a seismic isolation device.

  Seismic isolation devices that support buildings, floors, large equipment, etc. are known. The seismic isolation device includes (1) an isolator such as a laminated rubber that is interposed in a vertical gap between the upper structure and the lower structure and supports the upper structure in a seismic isolation manner, and (2) the vertical gap. And a friction damper that is interposed in parallel with the isolator and attenuates horizontal vibration between the upper structure and the lower structure.

  In Patent Document 1, as an example of the friction damper 110, a sliding surface 121 provided on the lower structure 1 side and a sliding surface 121 provided on the upper structure 3 side are slid horizontally with respect to the sliding surface 121. A friction member 123 having a friction surface 123a, and a group of disc springs (hereinafter referred to as discs) that are interposed between the friction member 123 and the upper structure 3 and press the friction surface 123a of the friction member 123 against the sliding surface 121. (Also referred to as a group of springs 130) is disclosed (see a side sectional view of FIG. 9).

  Here, in this friction damper 110, a pair of upper and lower cylindrical casing members 141, 142 is connected to transmit the relative displacement (relative movement) in the horizontal direction of the upper structure 3 with respect to the lower structure 1 to the friction member 123. Is arranged so as to cover the peripheral side of the disc spring group 130. Further, when the friction damper 110 is interposed in the vertical gap δ, it is necessary to compress the disc spring group 130 to reduce the height dimension of the friction damper 110. Therefore, the compression amount of the disc spring group 130 is reduced. A nut 151 to be adjusted and a shaft member 152 into which the nut 151 is screwed are separately provided outside the cylindrical casing members 141 and 142.

Japanese Patent Laid-Open No. 10-238164

However, the presence of the cylindrical casing members 141 and 142 and the outer nut 151 and shaft member 152 further increases the size of the friction damper 110. Then, since the external dimension is large, handling becomes difficult. In addition, the large-diameter cylindrical casing members 141 and 142 also increase the weight of the friction damper 110, increasing the work load during construction.
Furthermore, since there is one disc spring group 130, a large disc spring must be used to secure a large frictional force for damping vibration, resulting in an increase in the disc spring manufacturing cost and manufacturing period. Invite.

  The present invention has been made in view of the above-described conventional problems, and an object thereof is to provide a seismic isolation device including a friction damper that is reduced in size and weight and is inexpensive.

In order to achieve this object, the invention shown in claim 1
An isolator that is interposed in a vertical gap between the upper structure and the lower structure and that supports the upper structure in a seismic isolation manner;
A friction damper that is interposed in parallel with the isolator in the vertical gap and attenuates horizontal vibration between the upper structure and the lower structure,
The friction damper is
A first pressure contact surface provided on one side of the upper structure and the lower structure;
A second pressure contact member provided on the other structure side and having a second pressure contact surface that slides in a horizontal direction with respect to the first pressure contact surface;
A spring member interposed between the second pressure contact member and the other structure to press the second pressure contact surface of the second pressure contact member to the first pressure contact surface with a predetermined pressure force;
A shaft body that is provided by being inserted through a vertical hole provided in the spring member, and that transmits a relative displacement in the horizontal direction of the other structure body to the one structure body to the second pressure contact member. ,
A guide for guiding the spring member to expand and contract in the vertical direction while suppressing a horizontal displacement of the spring member by coming into contact with the inner peripheral surface of the hole of the spring member. Part is formed,
The shaft body has a screwing portion into which a screw member for adjusting the compression amount of the spring member is screwed, and the screw member uses the axial force generated in the shaft body as a reaction force, and the second pressure contact member. The amount of compression of the spring member is adjusted by sandwiching the spring member with
The screw member is removed from the friction damper after the friction damper is disposed in the gap in the vertical direction .

  According to the first aspect of the present invention, the shaft body is a single member, but the function of transmitting the horizontal relative displacement to the second pressure contact member, the function of guiding the spring member, and the spring member It fulfills the three functions of adjusting the amount of compression and changing the height of the friction damper. Therefore, the number of parts of the friction damper can be reduced, and the cost can be reduced.

  Further, the shaft body having these three functions is provided through the hole of the spring member, that is, provided inside the spring member. Therefore, the external dimensions of the friction damper do not increase with the installation of the shaft body, and the friction damper can be reduced in size.

Furthermore, the weight of the shaft is lighter than when a large-diameter cylindrical casing member is disposed on the outer periphery of the spring member. Therefore, the weight of the friction damper can be reduced.
Further, by visually confirming the presence or absence of the screw member, it can be easily determined whether or not the arrangement of the friction damper is completed. Moreover, since the screw member is removed, mischief such as a tightening operation by a third party can be effectively prevented.

The invention shown in claim 2 is the seismic isolation device according to claim 1,
The friction damper has a gantry interposed between the other structure and the spring member,
The gantry comprises a pair of upper and lower flanges, and a web connecting the flanges,
One flange of the gantry is fixed to the other structure,
The shaft body is inserted into the through hole of the other flange of the gantry, and one end portion of the shaft body is brought into contact with and engaged with the inner peripheral surface of the through hole, and the other end portion of the shaft body is By being fixed to the two pressure contact members, a horizontal relative displacement of the other structure to the one structure is transmitted to the second pressure contact member,
One end of the shaft body that contacts and engages with the through hole of the other flange faces the space between the one flange and the other flange, and the screw member is screwed into the one end. The screwing portion to be mated is provided.

  According to the second aspect of the present invention, the screw member can be positioned in a space between one flange and the other flange of the gantry. Therefore, during the installation work of the friction damper in the vertical gap, the work of tightening or loosening the screw member can be performed smoothly using the space as a work space. Greatly improved.

The invention shown in claim 3 is the seismic isolation device according to claim 2,
The friction damper is
As the spring member, it has at least a first disc spring group in which a plurality of disc springs are overlaid, and a second disc spring group in which a plurality of disc springs are overlaid,
The shaft body has at least a first shaft body and a second shaft body,
As a through hole of the other flange of the gantry, it has at least a first through hole and a second through hole,
The first shaft is inserted into the hole of the first disc spring group, and one end of the first shaft is in contact with the inner peripheral surface of the first through hole of the other flange of the gantry. And the other end of the first shaft body is fixed to the second pressure contact member,
The second shaft body is inserted into the hole of the second disc spring, and one end of the second shaft body is brought into contact with the inner peripheral surface of the second through hole of the other flange of the gantry. The other end portion of the second shaft body is fixed to the second pressure contact member.

  According to the third aspect of the present invention, there are at least two disc spring groups of the first disc spring group and the second disc spring group, and the elastic force of these disc spring groups is the second pressure contact member, respectively. And is provided as a pressure contact force to the first pressure contact surface of the second pressure contact member. That is, the pressure contact force can be increased by increasing the number of disc spring groups.

  Therefore, the frictional force between the second pressure contact surface and the first pressure contact surface can be increased to the target value by increasing the number of disk spring groups without using a large disk spring. That is, the friction damper can be configured using a small disc spring which is generally inexpensive and has a short production period. As a result, the cost of the friction damper can be reduced and the production period can be shortened.

Invention of Claim 4 is the seismic isolation apparatus in any one of Claim 1 thru | or 3, Comprising:
By tightening the screw member before disposing the friction damper in the vertical gap, an axial force is generated in the shaft body, and the spring member is compressed and deformed.
After the friction damper is disposed in the vertical gap, the screw member is loosened to weaken the axial force of the shaft body, and the spring member moves the second pressure contact surface to the first pressure contact surface. The pressure contact is performed with a predetermined pressure.

  According to the fourth aspect of the present invention, it is possible to smoothly dispose the friction damper in the vertical gap between them while avoiding interference with both the upper structure and the lower structure. The second pressure contact surface can be pressed against the first pressure contact surface with the predetermined pressure contact force, that is, it can immediately function as a friction damper.

The invention shown in claim 5 is the seismic isolation device according to any one of claims 1 to 4 ,
The shaft core of the screwed portion is concentric with the shaft core of the shaft body.

According to the fifth aspect of the present invention, the shaft core of the threaded portion is concentric with the shaft core of the shaft body. The shaft body is inserted through a hole formed in the spring member. Therefore, the axial force of the shaft generated by the screwing of the screw member and the screwed portion can be transmitted to the spring member with a substantially uniform load distribution in the circumferential direction of the hole of the spring member. As a result, it is not necessary to provide a plurality of compression shaft members along the circumferential direction for the purpose of uniformly compressing the spring member over the entire circumference in the circumferential direction, resulting in a reduction in the number of parts of the friction damper. I can plan.

  ADVANTAGE OF THE INVENTION According to this invention, the seismic isolation apparatus provided with the friction damper which was reduced in size and weight and was cheap can be provided.

FIG. 1A is a longitudinal sectional view of the seismic isolation device according to the present embodiment, FIG. 1B is a view taken along the line BB in FIG. 1A, and FIG. 1C is a view taken along the line CC in FIG. It is explanatory drawing of the state which reduced the height dimension of the friction damper 10 by fastening of the fastening bolt 42. FIG. 3A is a longitudinal sectional view of the first modification, and FIG. 3B is a view taken along the line BB in FIG. 3A. 4A is a longitudinal sectional view of the second modification, and FIG. 4B is a view taken along the line BB in FIG. 4A. FIG. 5A is a longitudinal sectional view of a third modification, FIG. 5B is a view taken along the line BB in FIG. 5A, and FIG. 5C is a view taken along the line CC in FIG. FIG. 6A is a longitudinal sectional view of a fourth modification, and FIG. 6B is a view taken along the line BB in FIG. 6A. 6A is also an AA arrow view in FIG. 6B. FIG. 7A is a longitudinal sectional view of a fifth modified example, and FIG. 7B is a view taken along the line BB in FIG. 7A. FIG. 7A is also an AA arrow view in FIG. 7B. 8A and 8B are longitudinal sectional views of a sixth modified example. FIG. 8A shows a usable state of the friction damper 10, and FIG. 8B shows a state in which the friction damper 10 is not usable (the friction damper 10 has a vertical gap). The state immediately after the intervention is shown in δ. It is a sectional side view of the friction damper 110 which concerns on the conventional seismic isolation apparatus.

=== This Embodiment ===
<<< Seismic isolation device >>>
1A to 1C are explanatory views of the seismic isolation device of the present embodiment. 1A is a longitudinal sectional view of the seismic isolation device, FIG. 1B is a view taken along the line BB in FIG. 1A, and FIG. 1C is a view taken along the line CC in FIG. 1A. 1A is also an AA arrow view in FIG. 1B. Further, in each drawing used in the following description, a cross-sectional line of a cross-sectional portion that should be originally shown by a cross-sectional line is omitted or is shown in a side view in order to prevent complication of the drawing.

  The seismic isolation device is interposed in a vertical gap δ between the building 3 (corresponding to the upper structure) and the foundation concrete 1 (corresponding to the lower structure) provided on the ground. As a result, the building 3 is horizontally isolated from and protected from vibrations such as earthquakes.

  The seismic isolation device is interposed between an isolator (not shown) such as a laminated rubber that supports the building 3 in a seismic isolation manner, and a vertical gap δ in parallel with the isolator, and attenuates horizontal vibration between the building 3 and the foundation concrete 1. And a friction damper 10.

  Here, as an isolator, a rolling bearing, a sliding bearing, etc. can be illustrated other than the above-mentioned laminated rubber. In other words, any structure that can support the weight of the building 3 while allowing horizontal relative displacement (relative movement) between the building 3 and the foundation concrete 1 is applicable.

  On the other hand, the friction damper 10 is (1) a sliding plate 20 laid and fixed on the upper surface of the foundation concrete 1 and having a sliding surface 20a (corresponding to a first pressure contact surface) on the upper surface, and (2) provided on the building 3 side. A friction member 25 (second pressure contact member) having a friction surface 25a (corresponding to a second pressure contact surface) slidable in the horizontal direction with respect to the sliding surface 20a, and (3) the friction member 25 and the building 3 And a disc spring group 30 (corresponding to a spring member) that presses the friction surface 25a of the friction member 25 against the sliding surface 20a with a predetermined pressing force, and (4) a disc spring group 30. A solid columnar shaft 40 provided through the vertical hole 30h for transmitting the horizontal relative displacement (relative movement) of the building 3 to the foundation concrete 1 to the friction member 25; ) H-shaped steel gantry 6 interposed between the building 3 and the disc spring group 30 It has a, and. The friction damper 10 attenuates the horizontal vibration of the building 3 by the horizontal friction force generated between the sliding surface 20a and the friction surface 25a based on the pressure contact force. Hereinafter, each component 20, 25, 30, 40, 60 of the friction damper 10 will be described.

  Examples of the sliding plate 20 include a stainless steel plate in which the upper surface 20a serving as the sliding surface 20a is horizontal and flat, a clad steel plate in which the stainless steel plate is joined and integrated on the upper surface side, and the like.

  The friction member 25 includes a horizontal plate member 26 and a horizontal friction plate 27 that is bolted to the lower surface of the plate member 26. The plate member 26 is a member having such a rigidity that it does not substantially deform even under the action of the elastic force for pressure contact from the disc spring group 30, and is a metal thick plate, for example. As the material of the friction plate 27, a material having a substantially constant friction coefficient μ with the sliding plate 20 is used. Here, since the sliding plate 20 is a stainless steel plate, stable friction with the stainless steel plate is achieved. As a material from which the coefficient μ is obtained, ethylene tetrafluoride, ultrahigh molecular weight polyethylene (for example, Somalite (trade name)), or the like is used.

  The gantry 60 is, for example, H-shaped steel, and the upper surface of the horizontal upper flange 61 is fixed to the lower surface of the building 3 with a bolt or the like (not shown), while the lower surface of the horizontal lower flange 63 is It is arranged facing upwards. The above-described disc spring group 30 is interposed between the lower surface of the lower flange 63 and the upper surface of the friction member 25. In the illustrated example, a thin spacer 90 is interposed between the lower surface of the building 3 and the upper flange 61 of the gantry 60, which will be described later.

  The disc spring group 30 is a disc spring laminated body in which a plurality of disc springs 33, 33... Are regularly laminated in a predetermined pattern. In this example, as shown in FIG. 1B, four disc spring groups 30, 30, 30, and 30 of the same specification are arranged in parallel with each other, so that the disc spring group 30 is four times as large as one. The elastic force can be applied to the friction member 25 as a pressure contact force.

  Specifically, the disc spring groups 30, 30, 30, 30 are arranged at four positions that are symmetrical to each other with respect to the plane center C 60 of the gantry 60. More specifically, the disc spring groups 30 are arranged on both sides of the web 62 of the gantry 60, and the two disc spring groups 30, 30 are arranged on the same side with the web 62 as a boundary. Accordingly, the four disc spring groups 30, 30, 30, 30 are arranged at each vertex of a square centering on the plane center C 60 of the gantry 60.

  The plate springs 33, 33,... Constituting the disk spring group 30 are formed with through holes 33h having the same shape at the center of the plane, and the circular centers of the through holes 33h, 33h,. . Therefore, these through holes 33h, 33h, ... are connected to each other vertically to form the hole 30h at the center of the plate spring group 30 described above, and the shaft body 40 is skewed along the vertical direction in the hole 30h. It is inserted in the shape. The male screw 40a formed on the outer peripheral surface of the lower end portion of the shaft body 40 is screwed and fixed to the female screw 26a of the plate member 26 of the friction member 25, and the upper end portion of the coaxial body 40 is connected to the gantry 60. The lower flange 63 is passed through the through hole 63h. Therefore, the shaft body 40 is positioned in the horizontal direction of the building 3 with respect to the foundation concrete 1 through contact engagement between the upper end portion and the inner peripheral surface of the through hole 63h and screwing and fixing between the lower end portion and the plate member 26. The relative displacement is transmitted to the friction member 25. That is, the shaft body 40 has a function of transmitting the relative displacement in the horizontal direction of the building 3 with respect to the foundation concrete 1 to the friction member 25. In order to perform the function reliably, the clearance between the through hole 63h of the lower flange 63 and the shaft body 40 is preferably made as small as possible.

  By the way, the shaft body 40 has two functions in addition to the above-described horizontal relative displacement transmission function. The first function is a function as a guide member that guides the disc spring group 30 so as to smoothly expand and contract in the vertical direction while suppressing horizontal displacement of the disc spring group 30. This function is achieved, for example, by adjusting the clearance between the inner peripheral surface of the hole 30h of the disc spring group 30 and the outer peripheral surface portion (corresponding to the guide portion) of the shaft body 40 that contacts the inner peripheral surface. . Note that the clearance amount is determined by, for example, obtaining a value that smoothly expands and contracts by experiment, for example, by shaking the clearance amount as a parameter.

  Another function is a function of changing the height of the friction damper 10 by adjusting the compression amount of the disc spring group 30, and this function is used when the friction damper 10 is installed on the foundation concrete 1. .

  This function includes (1) a female screw 40b (corresponding to a screwed portion) formed concentrically and integrally with the upper end of the shaft body 40, and (2) a tightening bolt 42 (screw) screwed into the female screw 40b. Equivalent to a member), (3) a washer member 44 interposed between the head 42a of the tightening bolt 42 and the upper surface of the lower flange 63, and (4) the friction member 25 described above. This is achieved by the cooperation of the shaft body 40.

  That is, as shown in FIG. 2, when the tightening bolt 42 is screwed and rotated in the tightening direction, an axial force is generated in the shaft body 40, and the constricted bolt 42 and the friction member 25 serve as a counterforce by using the axial force as a reaction force. By sandwiching the group 30, the disc spring group 30 is compressed and deformed. In other words, the axial force generated in the shaft body 40 is transmitted in the order of the head 42a of the tightening bolt 42 → the washer member 44 → the lower flange 63 → the disc spring group 30. As a result, the disc spring group 30 moves downward. It is pushed and compressed and deformed. As a result, the height dimension of the friction damper 10 (more precisely, the height dimension H of the friction damper 10 excluding the sliding plate 20) is reduced, so that the vertical gap between the building 3 and the foundation concrete 1 is reduced. When installing the friction damper 10 on δ, the installation work can be smoothly performed while effectively avoiding interference with the building 3 and the foundation concrete 1.

  Incidentally, as will be described in detail later, after the friction damper 10 is installed, the axial force of the shaft body 40 is weakened and released by loosening the tightening bolts 42 as shown in FIG. 1A. 30 is released from compression restraint by the tightening bolt 42, the shaft body 40, and the plate member 26. Then, the disc spring group 30 presses the friction surface 25a of the friction member 25 against the sliding surface 20a of the sliding plate 20 with an intended pressing force based on the elastic force.

  Thus, the shaft body 40 has three functions. That is, these three functions can be performed by a single member. Therefore, according to the friction damper 10 provided with the shaft body 40, the number of parts can be reduced and the cost can be reduced.

  Further, as described above, the shaft body 40 is provided by vertically passing through the hole 30 h of the disc spring group 30, that is, provided radially inward of the disc spring group 30. Therefore, the external dimensions of the friction damper 10 do not increase with the provision of the shaft body 40, and the friction damper 10 can be reduced in size. Further, since the volume of the shaft body 40 is small, the shaft body 40 itself can be lightened, and as a result, the weight of the friction damper 10 can be reduced.

  Furthermore, since the female screw 40b at the upper end of the shaft body 40 is formed concentrically with the shaft core of the shaft body 40, the shaft core of the tightening bolt 42 is necessarily concentric with the shaft core of the shaft body 40. The shaft body 40 is inserted concentrically with the hole 30 h of the disc spring group 30. Therefore, the axial force of the shaft body 40 can be transmitted to the disc spring group 30 with a uniform load distribution over the entire circumference in the circumferential direction of the hole 30h (that is, the circumferential direction of the disc spring group 30). As a result, it is not necessary to arrange a plurality of compression shaft members along the circumferential direction in order to uniformly compress the disc spring group 30 over the entire circumference in the circumferential direction. As a result, the components of the friction damper 10 The number of points can be reduced.

  By the way, in this example, as the washer member 44, a configuration is shown in which two members, a first washer 44a and a second washer 44b, are vertically stacked. Specifically, the first washer 44a is positioned closer to the head 42a side of the tightening bolt 42 than the second washer 44b, and the inner diameter thereof is formed so as to be in contact with the head 42a of the tightening bolt 42. Yes. This is because the axial force of the tightening bolt 42 described above is transmitted to the lower disc spring group 30 through contact between the head 42a of the tightening bolt 42 and the first washer 44a. On the other hand, the second washer 44b is a washer having a larger diameter than the first washer 44a, that is, both the outer diameter and the inner diameter thereof are larger than those of the first washer 44a. The inner diameter of the second washer 44b is set smaller than the outer diameter of the first washer 44a so that the first washer 44a can be placed on the second washer 44b.

  However, the inner diameter of the second washer 44b is set larger than the outer diameter of the shaft body 40 described above. This is because when the disc spring group 30 is contracted, the upper end portion of the shaft body 40 may protrude upward from the through hole 63h of the lower flange 63, and at the time of the protrusion, the upper end portion of the shaft body 40 is accommodated. This is to secure space. In other words, due to the existence of this space, the shortenable amount of the disc spring group 30, that is, the shortenable amount of the height dimension H of the friction damper 10 is increased.

<<< Installation procedure of friction damper 10 >>>
Here, the installation procedure of the friction damper 10 on the foundation concrete 1 is demonstrated. In the following description, the structure in which only the sliding plate 20 is removed from the friction damper 10, that is, the gantry 60, the disc spring group 30, the shaft body 40, the washer member 44, the tightening bolt 42, and the friction member 25 are integrally formed. The assembled body is also called the friction damper 10.

  First, as shown in FIG. 1A, the sliding plate 20 is placed and fixed on the upper surface of the foundation concrete 1 (first step).

  Next, as shown in FIG. 2, the friction damper 10 is interposed in the vertical gap δ between the building 3 and the foundation concrete 1 in a state where the tightening bolt 42 is tightened and the friction damper 10 is contracted by an appropriate amount. Then, it is placed on the upper surface of the sliding plate 20 of the basic concrete 1.

  That is, since the friction damper 10 has the disc spring group 30 here, when the tightening bolt 42 is tightened or loosened, the expansion / contraction deformation of the disc spring group 30 and the height dimension H of the friction damper 10 change. . Therefore, when interposing in the vertical gap δ, the tightening bolt 42 is tightened in advance so that the friction damper 10 is contracted in the vertical direction and placed on the sliding plate 20 in this contracted state. (Second step).

  Incidentally, since the head portion 42a of the tightening bolt 42 is located in the space between the upper flange 61 and the lower flange 63 of the gantry 60, the monkey wrench is used as the working space for the tightening operation described above. It can be used for the operation of tools such as, and is excellent in workability. The same applies to the loosening operation of the tightening bolt 42 according to the third step and the fifth step described later.

  Then, the tightening bolt 42 is loosened so that the deflection amount of the disc spring group 30 becomes a predetermined design deflection amount with respect to the friction damper 10 placed on the sliding plate 20. This design deflection amount is uniquely determined based on the design value of the frictional force that the friction damper 10 should generate. That is, based on the design value of the friction force between the sliding surface 20a of the sliding plate 20 and the friction surface 25a of the friction member 25, the design value of the pressure contact force between the sliding surface 20a and the friction surface 25a is determined. The design value of the elastic force of each disc spring group 30 is determined based on the design value of this pressure contact force, and the design deflection amount of the disc spring group 30 is determined based on the design value of this elastic force.

  In the loosening operation of the tightening bolts 42, the tightening bolts 42 are loosened to reduce the amount of bending until the amount of bending of the disc spring group 30 reaches the designed amount of deformation corresponding to the required frictional force. (Third step).

  If it does so, as shown to FIG. 1A, the spacer 90 will be inserted and inserted in the clearance gap between the upper flange 61 of the gantry 60, and the lower surface of the building 3 above it, and the said clearance gap will be filled. Then, with the gap filled, the upper flange 61 of the gantry 60 is fixed to the lower surface of the building 3 with a bolt (not shown) through the spacer 90 (fourth step).

  Although the installation work of the friction damper 10 is almost completed by the above operation, the friction damper 10 in this state is not yet in a state where the damping function can be exhibited. Therefore, finally, the tightening bolt 42 is loosened so that the damping function can be exhibited. That is, as shown in FIG. 1A, the tightening bolt 42 is loosened until the axial force of the tightening bolt 42 and the shaft body 40 is completely released. As a result, the action target of the elastic force of the disc spring group 30 moves from the tightening bolt 42 and the shaft body 40 to the friction surface 25a and the sliding surface 20a. A force is generated between the friction surface 25a and the sliding surface 20a (fifth step).

  In the fifth step, when the fastening bolt 42 and the washer member 44 can be completely removed from the shaft body 40, they may be removed. In this case, the presence or absence of the fastening bolt 42 is visually confirmed. Thus, it is possible to easily determine whether or not the friction damper 10 is in a usable state (that is, whether or not the friction damper 10 is in a state in which a damping function can be exhibited).

  Further, the design deflection amount of the disc spring group 30 according to the third step described above is small in the non-linear region in the load-deflection relationship of the disc spring 33, that is, the change in the elastic force with respect to the change in the deflection amount of the disc spring 33 is small. It is preferably set within the region. If the design deflection is within this non-linear region, even if the above-mentioned vertical gap δ changes due to changes over time such as creep of the isolator and expansion / contraction due to temperature fluctuations, the disc spring group The fluctuation of the elastic force of 30 can be kept small, and as a result, the frictional force between the friction surface 25a and the sliding surface 20a can be maintained almost constant. Thereby, the friction damper 10 can exhibit a stable vibration damping action.

  By the way, in the description of the above installation procedure, the case where the friction damper 10 is inserted in the vertical gap δ between the lower surface of the existing building 3 and the foundation concrete 1 has been described as an example, but the installation procedure of the friction damper 10 is described. Is not limited to this. For example, first, the foundation concrete 1 is constructed, then the first step and the second step are performed, then the lower surface of the building 3 is constructed, and then the third step to the fifth step are performed. Anyway.

<<< Modification of Friction Damper 10 >>>
3A is a longitudinal sectional view of the first modification, and FIG. 3B is a view taken along the line BB in FIG. 3A. 3A is also an AA arrow view in FIG. 3B.

  This first modification is different from the above-described embodiment (FIG. 1A) in terms of the number of disk spring groups 30 and their planar arrangement, and the other configurations are the same. That is, as shown in FIG. 3B, the friction damper 10 includes four disc spring groups 30 arranged on both sides of the web 62 of the gantry 60, so that a total of eight disc spring groups 30 are provided. Have. As a result, the length of the gantry 60 in the longitudinal direction and the length of the sliding plate 20 in the same direction are also approximately twice those of the above-described embodiment. However, the friction member 25 is the same size as the above-described embodiment, that is, one friction member 25 is provided for each of the four disc spring groups 30 as in the above-described embodiment. As a result, two friction members 25, 25 are arranged side by side along the longitudinal direction of the gantry 60 as a plurality of examples. Here, the reason why the friction member 25 of the length corresponding to the eight disc spring groups 30 is not used is that, for example, it is one-sided according to the level of flatness or levelness of the lower surface of the foundation concrete 1 or the building 3. This is to prevent the disc spring group 30 from being able to properly apply the pressure contact force.

  4A is a longitudinal sectional view of the second modification, and FIG. 4B is a view taken along the line BB in FIG. 4A. 4A is also an AA arrow view in FIG. 4B.

  This second modified example is different from the first modified example (FIG. 3B) in the planar arrangement of the disc spring group 30. That is, as shown in FIG. 4B, the friction damper 10 has a gantry 60 in which the upper and lower flanges 61 and 63 have a square shape in plan view in order to eliminate directivity related to the vibration damping action in the horizontal direction as much as possible. While surrounding the plane center C60 of the gantry 60, eight disc spring groups 30, 30... Are arranged at equal pitches along the four sides. Further, the plate member 26 of the friction member 25 is also formed in a similar square so as to correspond to the square shape of the gantry 60.

  Incidentally, when the number of the disc spring groups 30 is large as in the second modified example and the first modified example described above, it is difficult to perform the assembling work of passing the shaft body 40 through the through hole 63h of the lower flange 63 of the gantry 60. However, in that case, the clearance between the shaft body 40 and the through-hole 63h of the lower flange 63 in some of the disc spring groups 30 among the disc spring groups 30, 30. 30 is preferably larger than the clearance between the shaft body 40 and the through hole 63h of the lower flange 63. For example, the disc spring group 30 having a large clearance and the disc spring group 30 having a small clearance may be arranged alternately. In this way, even in the case of the friction damper 10 having the eight disc spring groups 30, 30... As described above, the eight through holes 63h, 63h. The corresponding shaft body 40 can be quickly passed.

  FIG. 5A is a longitudinal sectional view of a third modification, FIG. 5B is a view taken along the line BB in FIG. 5A, and FIG. 5C is a view taken along the line CC in FIG. 5A is also an AA arrow view in FIG. 5B.

  In the above-described embodiment (FIG. 1A), the tightening bolt 42 is used as a screw member to change the height dimension of the friction damper 10, and the tightening bolt 42 is screwed to the upper end portion of the shaft body 40. Although the female screw 40b is formed as the screwing portion, in this third modification, the nut 46 is used as the screw member, and the nut 46 is screwed onto the outer peripheral surface of the upper end portion of the shaft body 40. The difference is that a male screw 40c is integrally formed as a joint portion. A washer 47 is disposed between the nut 46 and the lower flange 63 of the gantry 60. Therefore, when the nut 46 is screwed and rotated in the tightening direction, the lower flange 63 of the gantry 60 is pushed downward through the contact between the nut 46 and the washer 47, whereby the disc spring group 30 is compressed and deformed. As a result, the height of the friction damper 10 is reduced, so that when the friction damper 10 is installed in the vertical gap δ, the installation is performed while effectively avoiding interference with the building 3 and the foundation concrete 1. You will be able to work smoothly.

  FIG. 6A is a longitudinal sectional view of a fourth modification, and FIG. 6B is a view taken along the line BB in FIG. 6A. Moreover, FIG. 7A is a longitudinal cross-sectional view of a 5th modification, and FIG. 7B is a BB arrow line view in FIG. 7A.

  6A and 6B is different from the above-described third modification (FIGS. 5A and 5B) in the number of disk spring groups 30 and their planar arrangement. Further, the fifth modified example of FIGS. 7A and 7B is different from the fourth modified example in the planar arrangement of the disc spring group 30. These differences are the difference between the above-described embodiment of FIG. 1A and the first modification of FIG. 3A, and the difference between the first modification of FIG. 3A and the second modification of FIG. 4A. Same as the point. Therefore, the description is omitted.

  8A and 8B are longitudinal sectional views of a sixth modification. 8A shows a usable state of the friction damper 10, and FIG. 8B shows a non-usable state (a state immediately after the friction damper 10 is interposed in the vertical gap δ).

  In the third modified example (FIG. 5A), the male screw 40c is integrally formed on the outer peripheral surface of the upper end portion of the shaft body 40. However, in the sixth modified example, the shaft body 40 has a two-member configuration. Yes. That is, a shaft body 48 having a smaller diameter than the shaft body 40 (hereinafter, referred to as a small diameter shaft body 48) is screwed and fixed to the upper end portion of the shaft body 40 while aligning the shaft cores. A small-diameter male screw 48c is formed on the outer peripheral surface of the upper end portion of the small-diameter shaft body 48, and a small-diameter nut 49 is screwed into the male screw 48c as a screw member. Then, when the nut 49 is screwed and rotated in the tightening direction, the lower flange 63 is pushed downward through the contact between the nut 49 and the washer member 44 as shown in FIG. 8B, whereby the disc spring group 30 is compressed. Deformed. As a result, the height of the friction damper 10 is reduced, so that when the friction damper 10 is installed in the vertical gap δ, the installation is performed while effectively avoiding interference with the building 3 and the foundation concrete 1. You will be able to work smoothly. In addition, as the washer member 44, the same washer member 44 as the above-mentioned embodiment (FIG. 1A) is used.

=== Other Embodiments ===
As mentioned above, although embodiment of this invention was described, this invention is not limited to this embodiment, The deformation | transformation as shown below is possible in the range which does not deviate from the summary.

  In the above-described embodiment, the seismic isolation device is interposed in the vertical gap δ between the building 3 and the foundation concrete 1, but is not limited to this. For example, if the building 3 is composed of multiple floors, a seismic isolation device is installed in the vertical gap between the upper floor slab as the upper structure and the lower floor ceiling slab as the lower structure. May be. Further, the upper structure may be applied to a floor on which a semiconductor manufacturing facility or the like, which is a vibration isolator, is installed, or a large apparatus.

  In the above-described embodiment, the disc spring group 30 is exemplified as the spring member. However, the spring member is not limited to this as long as it has a hole 30h through which the shaft body 40 can be inserted vertically, and a coil spring is used. May be.

  In the above-described embodiment, the disc spring group 30 as the spring member is located on the upper structure side (building 3 side) rather than the sliding surface 20a as the first pressure contact surface and the friction member 25 as the second pressure contact member. However, this vertical relationship is not limited to this, and may be reversed. That is, the disc spring group 30 may be positioned on the lower structure side (foundation concrete 1 side) than the sliding surface 20a and the friction member 25.

  In the above-described embodiment, the H-shaped steel is exemplified as the gantry 60. However, the structure is not limited to this as long as the upper flange 61 and the lower flange 63 are connected by the web 62. For example, groove steel may be used.

1 foundation concrete (lower structure), 3 building (upper structure),
10 Friction damper,
20 sliding plate, 20a sliding surface (first pressure contact surface),
25 friction member (second pressure contact member), 25a friction surface (second pressure contact surface),
26 plate member, 26a female screw, 27 friction plate,
30 disc spring group (spring member), 30h hole,
33 disc spring, 33h through hole,
40 shaft body, 40a male thread, 40b female thread, 40c male thread,
42 tightening bolt (screw member), 42a head 44 washer member, 44a first washer, 44b second washer,
46 Nut (screw member), 47 Washer,
48 Small-diameter shaft body, 48c Male thread, 49 Nut (screw member),
60 frame, 61 upper flange (flange), 62 web,
63 Lower flange (flange), 63h Through hole,
90 spacer,
C60 plane center, δ vertical gap,

Claims (5)

An isolator that is interposed in a vertical gap between the upper structure and the lower structure and that supports the upper structure in a seismic isolation manner;
A friction damper that is interposed in parallel with the isolator in the vertical gap and attenuates horizontal vibration between the upper structure and the lower structure,
The friction damper is
A first pressure contact surface provided on one side of the upper structure and the lower structure;
A second pressure contact member provided on the other structure side and having a second pressure contact surface that slides in a horizontal direction with respect to the first pressure contact surface;
A spring member interposed between the second pressure contact member and the other structure to press the second pressure contact surface of the second pressure contact member to the first pressure contact surface with a predetermined pressure force;
A shaft body that is provided by being inserted through a vertical hole provided in the spring member, and that transmits a relative displacement in the horizontal direction of the other structure body to the one structure body to the second pressure contact member. ,
A guide for guiding the spring member to expand and contract in the vertical direction while suppressing a horizontal displacement of the spring member by coming into contact with the inner peripheral surface of the hole of the spring member. Part is formed,
The shaft body has a screwing portion into which a screw member for adjusting the compression amount of the spring member is screwed, and the screw member uses the axial force generated in the shaft body as a reaction force, and the second pressure contact member. The amount of compression of the spring member is adjusted by sandwiching the spring member with
The seismic isolation device according to claim 1 , wherein the screw member is removed from the friction damper after the friction damper is disposed in the vertical gap . The seismic isolation device according to claim 1,
The friction damper has a gantry interposed between the other structure and the spring member,
The gantry comprises a pair of upper and lower flanges, and a web connecting the flanges,
One flange of the gantry is fixed to the other structure,
The shaft body is inserted into the through hole of the other flange of the gantry, and one end portion of the shaft body is brought into contact with and engaged with the inner peripheral surface of the through hole, and the other end portion of the shaft body is By being fixed to the two pressure contact members, a horizontal relative displacement of the other structure to the one structure is transmitted to the second pressure contact member,
One end of the shaft body that contacts and engages with the through hole of the other flange faces the space between the one flange and the other flange, and the screw member is screwed into the one end. A seismic isolation device, wherein the threaded portion to be mated is provided. The seismic isolation device according to claim 2,
The friction damper is
As the spring member, it has at least a first disc spring group in which a plurality of disc springs are overlaid, and a second disc spring group in which a plurality of disc springs are overlaid,
The shaft body has at least a first shaft body and a second shaft body,
As a through hole of the other flange of the gantry, it has at least a first through hole and a second through hole,
The first shaft is inserted into the hole of the first disc spring group, and one end of the first shaft is in contact with the inner peripheral surface of the first through hole of the other flange of the gantry. And the other end of the first shaft body is fixed to the second pressure contact member,
The second shaft body is inserted into the hole of the second disc spring, and one end of the second shaft body is brought into contact with the inner peripheral surface of the second through hole of the other flange of the gantry. The other end portion of the second shaft body is fixed to the second pressure contact member. A seismic isolation device according to any one of claims 1 to 3,
By tightening the screw member before disposing the friction damper in the vertical gap, an axial force is generated in the shaft body, and the spring member is compressed and deformed.
After the friction damper is disposed in the vertical gap, the screw member is loosened to weaken the axial force of the shaft body, and the spring member moves the second pressure contact surface to the first pressure contact surface. A seismic isolation device characterized by being pressed with a predetermined pressure. The seismic isolation device according to any one of claims 1 to 4 ,
The seismic isolation device according to claim 1, wherein an axis of the threaded portion is concentric with an axis of the shaft body.