JP2006162059A - Lead damper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lead damper capable of obtaining sufficient damping performance and being reduced in its size and weight. <P>SOLUTION: This lead damper is composed of a damper main body 1 composed of lead mass, and arms 2 respectively mounted between each of both end portions of the damper main body and a structure, and transmitting the vibration of the structure to the damper main body for torsionally plastically deforming the damper main body. Circular flange portions 3 projecting outside are integrally formed on both end portions of the damper main body, flange portions 7 corresponding thereto are formed on basic end outer peripheral portions of the arms, and these flanges are fastened by bolts, thus the basic end portions of the arms are relatively unrotatably connected with the damper main body, and tip end portions of the arms are relatively rotatably connected with the structure. The whole components are bolted in a state that the flange portions of the damper main body are held by a reinforcement plate 11 used also as a washer and the flange portions of the arms over the whole circumference from its both face sides. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a damper installed as a damping device in a seismic isolation structure or a damping structure, and more particularly to a lead damper configured to absorb and dampen vibration by plastic deformation of a lead block.

As this type of lead damper, for example, one disclosed in Patent Document 1 is common. This mainly consists of lead pillars that are formed by bending lead ingots into a special shape, and such lead pillars are interposed between the base of a base-isolated building and the upper structure supported by it, for example. By doing so, the lead column body is plastically deformed so as to be bent by the relative displacement generated between the foundation and the upper structure during an earthquake, thereby absorbing vibration energy and obtaining a damping effect.
JP 2003-27766 A

  In the conventional lead damper configured to absorb vibrations by bending deformation of the lead column as shown in Patent Document 1, the stress state of each part when the lead column is plastically deformed is not uniform. Therefore, only a part of the lead pillar body is plastically deformed locally, and it is not always possible to obtain sufficient attenuation performance, so it is necessary to increase the amount of lead used to increase the attenuation performance, Inevitably, the size and weight must be increased.

  In view of the above circumstances, an object of the present invention is to provide a lead damper that can obtain sufficient damping performance and can be reduced in size and weight.

  The invention of claim 1 is a lead damper configured to be interposed between two members and absorb and damp vibration generated between the two members by plastic deformation of the lead mass, and a damper main body made of the lead mass; An arm that is interposed between both ends of the damper main body and each of the two members, and that plastically deforms the damper main body by twisting the damper main body by transmitting vibrations generated between the two members to the damper main body. The base end portion of each arm is connected to both end portions of the damper main body so as not to be relatively rotatable, and the tip end portion of each arm is connected to each of the two members so as to be relatively rotatable. It is characterized by that.

  The invention according to claim 2 is the lead damper according to claim 1, wherein an annular flange portion projecting outward is integrally formed at both end portions of the damper main body, and the damper is provided at a base end outer peripheral portion of the arm. A flange portion that can be in close contact with the flange portion of the main body is formed, and the base end of each arm is fastened by bolting the flange portion of the base end outer peripheral portion of each arm to the flange portion of each end of the damper main body. The portion is connected to the damper main body so as not to be relatively rotatable, and the tip of each arm is connected to the two members so as to be relatively rotatable.

  The invention according to claim 3 is the lead damper according to claim 2, wherein a reinforcing plate serving as a washer is attached to the entire back surface of the flange portion of the damper main body, and the reinforcing plate and the arm The flange portion of the damper main body is clamped over the entire circumference from both sides of the flange portion by the flange portion of the base end outer peripheral portion, and the whole is bolted.

  The invention according to claim 4 is the lead damper according to any one of claims 1 to 3, wherein a rigid shaft supported by a stiffener is provided at a central position when the damper main body is twisted, and the rigid shaft is provided. On the other hand, the base end portion of one of the arms is engaged with at least t so as to be rotatable in a vertical plane.

  In the lead damper according to the first aspect of the present invention, the vibration between the members on which the lead damper is installed is transmitted to the both end portions of the damper main body through the arms as a reverse rotational force, whereby the torsional deformation force is concentrated on the damper main body. It is plastically deformed so that the entire damper body is twisted, and exhibits excellent damping performance. Therefore, according to the lead damper of the present invention, the energy absorption efficiency is improved as compared with the lead damper of the type that obtains the damping performance by bending deformation of the conventional lead pillar body, and the use of lead necessary for obtaining the desired damping performance is used. The amount can be reduced, and the lead damper can be made smaller and lighter. In addition, the deformability and yield load of the damper body can be widely adjusted by setting the length of the arm and the shape of the damper body.

  According to the lead damper of the invention of claim 2, since the arm is fixedly connected to the damper main body by bolt fastening, a work by a special joining method such as homogen welding is unnecessary, and it can be manufactured easily and inexpensively. . Moreover, since the disassembly and reassembly can be performed at the installation location, the damper main body and the arm can be easily replaced at the site as needed.

  According to the lead damper of the invention of claim 3, the flange plate formed on both the damper main body and the arm is fastened with bolts so that they are connected and fixed, and the reinforcing plate is also used as a washer. And the flange part of the arm, and the flange part of the damper body is clamped from the front and back over the entire circumference. Strength can be obtained and the entire damper body can be reliably plastically deformed, and damage to the flange portion can be reliably prevented.

  According to the lead damper of the invention of claim 4, the rigid shaft supported by the stiffener is provided at the center position when the damper main body is twisted, and is rotatable in a plane perpendicular to the rigid shaft. Since the base end of at least one arm is engaged, the damper body will be twisted and deformed due to the relative rotation of both arms in the opposite direction with the rigid shaft securely supported by the stiffener. Further, it is possible to prevent unnecessary shear deformation from occurring in the damper main body. Therefore, ideal torsional deformation can be caused and the expected damper effect can be exhibited.

  1 to 3 show a lead damper according to a first embodiment of the present invention. The lead damper of this embodiment is installed as a damping device between the two members (foundation and superstructure) of the base part of the base-isolated building, and basically absorbs and attenuates the vibration of the building by plastic deformation of the lead block. And a pair of two arms 2 for transmitting vibrations of the building to the damper body 1 and plastically deforming the damper body 1 so as to be twisted in the opposite direction up and down. It consists of.

  As shown in FIGS. 1 and 2, the damper main body 1 is a lead molded body having a substantially solid columnar shape or disk shape, and projects in an annular shape outwardly at both upper and lower ends thereof. The flange portions 3 are integrally formed, and a large number (12 in the illustrated example) of bolt holes 4 are formed in each flange portion 3.

  Each arm 2 is formed by processing a thick strip-shaped steel material, and these arms 2 intersect with each other at a predetermined angle α (α = 0 to 180 degrees) as shown in FIG. These base ends are connected to the top and bottom of the damper body 1 respectively, and the tips of the arms 2 are beams as a foundation (member) 5 and an upper structure 6 in the building, respectively, as shown in FIG. It is connected to (member).

  The base end portion of each arm 2 is formed in a circular shape that matches the flange portion 3 of the damper main body 1, and the outer peripheral portion thereof is a flange portion 7 having a bolt hole 8 corresponding to the flange portion 3. , 7 are brought into direct contact with each other, the bolt 9 is inserted, the nut 10 is screwed and the bolt is fastened, and the base end of the arm 2 is firmly connected to the damper main body 1 in a state in which the relative rotation is impossible. It is supposed to be. When the bolts are fastened, a half-ring reinforcing plate 11 made of steel is attached to the back side of the flange portion 3 of the damper main body 1 also as a washer, so that the reinforcing plate 11 and the flange portion 7 of the arm 2 In the state which clamped the flange part 3 of the damper main body 1 from the front and back both surfaces over the perimeter, those wholes are bolted.

  On the other hand, the tip of each arm 2 is formed in a circular shape, and a central hole 12 is formed therein, and the tip of each arm 2 is connected to the building so as to be relatively rotatable. . That is, as shown in FIG. 1 and FIG. 3B, the shaft body 13 is fixed upward by the anchor bolt 14 on the upper surface side of the foundation 5, and the shaft body 13 is formed at the distal end portion of the lower arm 2. The lower arm 2 is pivotally supported with respect to the shaft body 13 so as to be rotatable in a horizontal plane by being passed through the central hole 12 and screwed with nuts 15 on the upper and lower sides thereof. Similarly, a similar shaft body 13 is fixed downward on the lower surface side of the upper structure 6 by an anchor bolt 14, and the shaft body 13 is passed through the center hole 12 at the tip of the upper arm 2 and above and below it. By screwing the nut 15, the upper arm 2 is also pivotally supported with respect to the shaft body 13 so as to be relatively rotatable in a horizontal plane.

  As described above, in the lead damper of this embodiment, the base end portions of the arms 2 are bolted to the upper and lower sides of the damper main body 1 so as not to be relatively rotatable, and the tip portions of the arms 2 are respectively the base 5 and the upper structure 6. When the building is vibrated and a relative displacement in the horizontal direction occurs between the foundation 5 and the upper structure 6 during an earthquake or the like, the relative displacement in FIG. As shown to (a), the space | interval d between the front-end | tip parts of both the arms 2 changes, and both the arms 2 rotate relative to each other in the opposite direction accordingly. As a result, a torsional moment corresponding to the length of the arm 2 is applied from both arms 2 to the upper and lower ends of the damper body 1, whereby the damper body 1 is twisted and plastically deformed, and the vibration energy absorption effect due to the plastic deformation Exhibits excellent damping performance.

  As described above, the lead damper according to the present embodiment can obtain excellent damping performance when the entire cylindrical damper body 1 undergoes torsional deformation, and thus has a special shape as shown in Patent Document 1. Energy absorption efficiency is improved compared to the case where damping performance is obtained by bending deformation of the lead pillar body, and therefore the amount of lead used to obtain the desired damping performance can be reduced, and sufficient size and weight reduction can be achieved. It is possible. Of course, the deformability and yield load of the damper body 1 can be widely adjusted by setting the length of the arm 2 and the shape of the damper body 1.

  Moreover, since the arm 2 is connected and fixed to the damper body 1 by bolt fastening, there is no need for any work by homogen welding or a special joining method. Therefore, this lead damper can be easily assembled only by bolt fastening work. Since no skill or special skill of the operator is required, defective products are not generated at the time of production, and the cost can be sufficiently reduced. In addition, the installation on the building is simple because it only needs to pivotally support the tip of the arm 2 so as to be rotatable relative to the shaft 13, and it can be disassembled and reassembled on site as necessary. The damper body 1 and the arm 2 can be easily replaced.

  Of course, by appropriately setting the diameter and number of bolts 9 for fastening the arm 2 and the damper body 1 and the thickness of the flange portion 3 formed on the damper body 1, the entire damper body 1 is plastically deformed. Needless to say, a sufficient connecting and fixing strength can be secured without hindrance, and in particular, the damper main body is formed by the reinforcing plate 11 and the flange portion 7 of the arm 2 using the half annular reinforcing plate 11 as in the above embodiment. By tightening the bolts with the flange part 1 of 1 being clamped from the front and back over the entire circumference, a sufficient reinforcing effect for the entire flange part 3 can be obtained simultaneously with the bolt fastening. It is possible to reliably prevent damage.

  The first embodiment of the present invention has been described above. However, the above-described embodiment is merely a preferred example, and the present invention is not limited to the above-described embodiment. For example, various embodiments are listed below. Variations and applications are possible.

  In the said embodiment, although the damper main body 1 was made into the columnar form, the form of the lead lump as the damper main body 1 is not specifically limited, The flange part 3 for connecting and fixing the arm 2 is attached to both ends. As long as it can be integrally formed and the desired deformation performance can be obtained through plastic deformation that twists the whole through the flange portion 3, the damper body 1 is, for example, a prismatic shape or an appropriate block. It can be in various forms such as a shape, and the dimensions are also arbitrary. Then, in accordance with the shape and dimensions of the damper main body 1, the shape of the flange portion 3 in the damper main body 1, the shape of the flange portion 7 formed on the base end outer peripheral portion of the arm 2, and the rear surface side of the flange portion 3 are attached. What is necessary is just to set the shape etc. of the reinforcement board 11. FIG. For example, for example, the damper body 1 may be prismatic and the flange 3 may be square, or the damper body 1 may be cylindrical and only the flange 3 is square. The base end portion is also formed in a square shape corresponding to the flange portion 3, and a rectangular flange portion 7 is formed on the outer peripheral portion thereof, and the reinforcing plate 11 is correspondingly formed in a rectangular divided annular shape such as a U-shape or a simple strip-shaped steel plate. What is necessary is just to employ | adopt.

  In the above-described embodiment, by sandwiching the flange portion 3 using the reinforcing plate 11 that also serves as a washer, there is an advantage that a reinforcing effect on the flange portion 3 can be obtained simultaneously with the bolt fastening. It is not necessary to provide it, and if sufficient connection fixing strength can be ensured, it is sufficient to omit the reinforcing plate 11 and use a normal washer. In addition, the reinforcing plate 11 in the above embodiment is a half-ring-shaped one in which the annular ring is divided into two, but as described above, the shape of the reinforcing plate 11 is a square divided ring or formed on the reinforcing plate 11. In addition to appropriately increasing or decreasing the number of bolt holes to be used, for example, a reinforcing plate 11 in which the ring (or square ring) is divided into three or four, or six as shown by a broken line in FIG. . Of course, the material, plate thickness, and shape of the reinforcing plate 11 may be set in consideration of the reinforcing effect on the flange portion 3, and a plurality of reinforcing plates 11 may be used in an overlapping manner if necessary. Further, the reinforcing plate 11 does not necessarily have to be used as a washer. Of course, the reinforcing plate 11 and a normal washer may be used in combination.

  Moreover, although the said embodiment is an example of installation in the base part of a seismic isolation building, the lead damper of this invention can be widely applied with respect to structures and buildings of various scales and uses, and its installation The position and installation form are also arbitrary. For example, since the above embodiment is an application example to a base part of a base-isolated building, the axis of the damper main body 1 is vertical and the arm 2 is installed in a posture that rotates in a horizontal plane. It is also possible to install the lead damper of the form as it is at the joint between the beam and the column of the vibration control building and operate it by interlayer deformation. In that case, the axis of the damper body 1 is horizontal and the arm 2 is vertical It may be installed in such a posture as to rotate inside. Of course, the structure for connecting the tip of the arm 2 to the structure (member) is optional as long as it is connected in a relatively rotatable state.

  As described above, the crossing angle α between the arms 2 is 0 to 180 degrees (α = 0 degrees, that is, both arms 2 are completely overlapped, and α = 180 degrees, that is, both arms 2 are aligned on a straight line. And may be set as appropriate in consideration of the relative displacement amount and directionality due to the assumed vibration. Of course, the material, shape, and dimensions of the arm 2 are arbitrary, and if necessary, a stiffening member such as a rib may be provided in order to ensure desired rigidity.

  Further, as in the second embodiment shown in FIG. 4, for example, the damper main body 1 is stacked in two or more stages, and the arm 2 common to both of them is fastened integrally with the bolts 9 to thereby form a multistage type. It is also possible to use a lead damper. In the example shown in FIG. 4, the arm 2 has a substantially oval shape, but it goes without saying that the shape of the arm 2 is also arbitrary in this example.

  As a modification of the above embodiment, as shown in FIG. 1, a guide shaft 16 is inserted into the center portion of the damper main body 1 so as to be relatively rotatable, and one end portion or both end portions of the guide shaft 16 are connected to the arm 2. It is conceivable to connect the base end portion. By providing such a guide shaft 16, the deformation center when the damper main body 1 is twisted is clearly defined by the guide shaft 16, so that the plastic deformation of the entire damper main body 1 may occur more reliably and efficiently. I can expect.

FIG. 5 is a perspective view showing a configuration of a lead damper according to a third embodiment of the present invention, which has been developed, FIG. 6 is a side view thereof, and FIG. 7 is a problem to be improved in the lead damper of this embodiment. It is explanatory drawing of.
In the lead damper of the first embodiment, since no means for restricting the direction when the damper main body 1 is deformed is provided, when the two arms 2 are opened and closed, as shown in FIG. When the force P acts on the surface of the damper, not only torsional deformation but also shear deformation as shown in the figure may occur at the same time. In this case, a damping force other than that assumed is generated, and there are cases where the design conditions are not met.

  In this regard, as described above, when the guide shaft 16 is inserted into the center portion of the damper main body 1, the deformation center when the damper main body 1 is twisted can be clearly defined by the guide shaft 16. Therefore, the effect of suppressing the aforementioned shear deformation to some extent can be expected. However, if only the guide shaft 16 is provided, when the guide shaft 16 itself is pulled by the arm 2 and falls down, the damper body 1 may be subjected to the same shear deformation.

  Therefore, in the lead damper of the third embodiment, as shown in FIGS. 5 and 6, a bolt (rigid shaft) supported by a stiffener 30 having a U-shaped cross section at the center position when the damper main body 1 is twisted. 40), and the base end of each arm 2 is engaged with the bolt 40 so as to be rotatable in a vertical plane.

  That is, the stiffener 30 has a pair of flat opposing walls 31 that cover the damper body 1 with the base ends of the arms 2 joined to both ends from the outside, and side walls 32 that connect the pair of opposing walls 31. It is U-shaped and securely holds both ends of the bolt 40 on the pair of opposing walls 31, and the damper 40 is inserted between the pair of opposing walls 31. The part is penetrated.

  Specifically, the central portion of the damper main body 1, the central portion of the flange portion 7 at the base end portion of both arms 2, and the central portion of the pair of opposing walls 31 of the stiffener 30 are all penetrated linearly. Through holes 34, 7 a, 33 are provided, and bolts 40 are inserted into the through holes 34, 7 a, 33 from the outside of one opposing wall 31 through a washer 41 and protrude from the other opposing wall 31. A nut 42 is screwed and fastened to the tip of the bolt 40 via a washer 41, whereby the damper body 1 and the arm 2 are rotatably engaged with the bolt 40.

  In this way, the both ends of the bolt (rigid shaft) 40 are securely held by the stiffener 30 and the arm 2 is engaged with the bolt 40 so as to be able to rotate, whereby an in-plane force is applied to the arm 2. Even when (FIG. 7) is applied, the force can be received by the bolt 40, and the damper main body 1 can be prevented from being affected by the force. As a result, it is possible to prevent the damper main body 1 from being subjected to unnecessary shear deformation other than torsion, so that ideal torsional deformation can be generated, and the expected damper effect can be exhibited.

  In this case, the damper main body 1 and the arm 2 are joined by bonding or welding because there is a possibility that the damper main body 1 and the arm 2 may interfere with the opposing wall 31 if bolts are used.

  Further, in order to increase the rigidity of the stiffener 30, the thickness or width of the member is increased, or ribs such as channel members 35 are provided on the outer surface of the side wall 32 of the stiffener 30 as shown in FIG. Also good.

  In the above embodiment, the case where both the arms 2 are engaged with the bolt 40 so as to be rotatable is shown, but one arm 2 is engaged with the bolt 40 and the stiffener 30 so as not to be relatively rotatable. May be combined. Further, the arm 2 and the stiffener 30 that are engaged with each other so as not to rotate relative to each other can be integrated. That is, as long as at least one arm 2 is freely rotatable with respect to the bolt 40 held by the stiffener 30, it does not hinder the opening and closing of both arms 2 and can be operated properly.

It is a figure which shows the assembly state of the lead damper which is 1st Embodiment of this invention. It is principal part sectional drawing of the lead damper. It is a figure which shows the installation state to the structure of the lead damper, (a) is a top view, (b) is a side view. It is a figure which shows the lead damper which is 2nd Embodiment of this invention, (a) is a side view, (b) is a top view. It is a perspective view which shows the structure of the lead damper of 3rd Embodiment of this invention. It is a side view of the lead damper. It is explanatory drawing of the problem which it is going to improve in the same embodiment. It is a perspective view which shows the example of reinforcement of the stiffener of the lead damper.

Explanation of symbols

1 Damper body 2 Arm 3 Flange 4 Bolt hole 5 Foundation (member)
6 Superstructure (members)
7 Flange portion 8 Bolt hole 9 Bolt 10 Nut 11 Reinforcement plate 12 Center hole 13 Shaft body 14 Anchor bolt 15 Nut 16 Guide shaft 30 Stiffener 40 Bolt (rigid shaft)

Claims (4)

A lead damper configured to be interposed between two members to absorb and dampen vibration generated between the two members by plastic deformation of the lead mass,
Twist the damper body by transmitting to the damper body the damper body consisting of a lead lump, and being interposed between both ends of the damper body and the two members, respectively, and transmitting vibrations generated between the two members. The arm that plastically deforms
The base end portion of each arm is connected to both end portions of the damper main body so as not to be relatively rotatable, and the tip end portion of each arm is connected to each of the two members so as to be relatively rotatable. A characteristic lead damper. The lead damper according to claim 1,
An annular flange portion projecting outward is integrally formed at both end portions of the damper main body, and a flange portion capable of being in close contact with the flange portion of the damper main body is formed on the base end outer peripheral portion of the arm,
The base end portion of each arm is connected to the damper main body so as not to be relatively rotatable by bolting the flange portion of the base end outer peripheral portion of each arm to the flange portion at both ends of the damper main body. A lead damper comprising a tip end connected to each of the two members so as to be relatively rotatable. The lead damper according to claim 2, wherein
A reinforcing plate that also serves as a washer is attached to the entire back surface of the flange portion of the flange portion of the damper main body, and the flange portion of the damper main body is disposed on both sides of the reinforcing plate and the flange portion of the base end outer peripheral portion of the arm. A lead damper characterized by being bolted together in a state of being clamped over the entire circumference from the side. The lead damper according to any one of claims 1 to 3,
A rigid shaft supported by a stiffener is provided at the center position when the damper body is twisted, and the base end of at least one of the arms is engaged with the rigid shaft so as to be rotatable in a plane perpendicular to the rigid shaft. Lead damper characterized by being combined.

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